Skip over navigation
ELECTROPHONIC MUSICAL INSTRUMENTS (electronic circuits in general H03)
Definition statement
This subclass/group covers:
  • Artistic processing of music, i.e. musical processing involving alterations in harmony, timbre, texture, melody, rhythm or expressivity
  • Assisted or automated music creation, synchronisation or interpretation, e.g. automatic composing, interactive music displays, karaoke, instrument karaoke, musical accompaniment, musical aspects of videogames
  • Music analysis or synthesis
  • electrophonic musical instruments, mechanical details, components or accessories for use in electrophonic musical instruments
  • Input/output devices therefor, e.g. electric guitar transducers, synthesiser keyboards
  • Control, communications or data organization therefor, e.g. effect pedals for guitars, internet jamming protocols, MIDI, wavetables, rhythm or harmony metadata.
Relationship between large subject matter areas

G10L Speech analysis or synthesis; speech recognition; speech or voice processing; speech or audio coding or decoding should systematically be considered as a function place for voice processing or audio coding applications, G10H being an application place for voice processing or audio coding with a musical application, e.g. melodic or rhythmic analysis of a singing voice, electrophonic musical instrument control, special encoding of audio sounds for synthesiser wavetables.

The classification of voice processing as speech processing G10L or electrophonic musical instruments G10H is therefore highly dependent on the primary vocal intent of the signal to be processed, i.e. communication of meaning, a.k.a. speech (G10L) or musical, e.g. singing.

If the primary vocal intent is musical, e.g. singing, then the nature, musical or not, of the voice processing, i.e. the result to be achieved, determines whether a G10H classification is appropriate.

Examples:

  • Recognition of sung words, i.e. meaning extraction: consider G10L 15/00 speech recognition
  • Musical melodic transcription (or transposition) of the sung words, e.g. to a musical score by extraction of note pitches or musical rhythm information: consider G10H .

Musical voice processing must be systematically classified in G10H, but G10L should be considered for the vocal processing aspects of musical voice processing.

Musical games, musical rhythm games such as dance games, musical aspects of videogames e.g. game background music changes, synchronisation between image and musical events, must systematically receive a classification of their musical aspects in G10H. A63F 13/00 should be considered for the gaming aspects of such games.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Basic electronic circuitry
Game rules or game display appearance
Audio or sound effects for videogames
Metronomes
Electrical digital data processing
Digital computing or data processing equipment or methods, specially adapted for information retrieval of audio data
Security arrangements for protecting computers or computer systems against unauthorised activity
Teaching music per se
Acoustic, i.e. non-electronic, musical instruments
Keyboard improvements also suitable for acoustic pianos, e.g. counterweights; mechanical details of electronic piano keyboards also mechanically driving hammers
Stringed musical instruments; wind-actuated musical instruments; accordions or concertinas; percussion musical instruments; musical instruments not otherwise provided for e.g. mechanical details or accessories of electronic musical instruments, corresponding to a suitable acoustic instrument type, e.g. whammy bar for electric guitars, bodies of electric guitars,
Aids for music; Supports for musical instruments; Other auxiliary devices or accessories for music or musical instruments
Sound producing devices
Speech analysis or synthesis; speech recognition; speech or voice processing; speech or audio coding or decoding
Speech or audio signal analysis-synthesis techniques for redundancy reduction in general, e.g. in vocoders ; Coding or decoding of speech or audio signals in general, using source filter models or psychoacoustic analysis
Information storage based on relative movement between record carrier and transducer
Signal processing not specific to the method of recording or reproducing; Circuits therefore
Music playlists, music indexing
Amplifiers
Gain control in amplifiers or frequency changers
Tone controls or bandwidth control in amplifiers
Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems, e.g. sound mixing
Details of transducers, loudspeaker or microphones
Stereophonic systems, e.g. 3D sound field processing
Pitch and rhythm extraction in videogames, substantially similar to G10H 2210/066 ("for pitch analysis"), G10H 2210/076 ("tempo analysis"), G10H 2210/091 ("performance evaluation") with G10H 2220/135 ("games"), also related to G10H 1/366 voice modification
Music games
Special rules of classification within this subclass

Classification of invention information and additional information is obligatory,

Classifying additional information is obligatory even if the main invention does not belong to this subclass.

Indexing Code symbols of the type G10H 2210/00 - G10H 2210/626 to G10H 2250/00 - G10H 2250/645 represent information mostly orthogonal to ECLA groups and should be systematically used to classify information relevant to the main described concepts and ideas, although it need not be invention information. The number of Indexing Code symbols assigned to a document is not limited.

It is considered acceptable to allocate three or four ECLA classes to a particular document if needed.

Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Musical instrument
"tool", "device" , "process" or "protocol" for performing some musical task involving electrophonic signals, e.g. musical parameters
Music
A n art form whose medium is sound and silence. Its common elements are pitch (which governs melody and harmony), rhythm (and its associated concepts tempo, meter, and articulation), dynamics, and the sonic qualities of timbre and texture.Music (including singing, the vocalized form of music) is distinguished from speech by its particular and deliberate emphasis on the above common elements, especially rhythm and melody.By contrast, speech is distinguished from music by its particular and deliberate emphasis on conveying meaning: Speech is the vocalized form of human communication
Musical
Generally employed in a restrictive limiting sense with respect to speech, general audio and sound, i.e. implying an intentional and artistic main focus at least by the performer on at least one of harmony, melody, rhythm, timbre, or expressivity. Even though one person's music may be noise to another, music is a performing art, and musical character is defined by the mere artistic intent of the performer
Musical content
Set of musical parameters.
Musical parameters
Constituent element of "musical content" as defined above. Musical parameters include e.g. pitch, rhythm, timbre, texture, expressivity or dynamics.
MIDI
MIDI stands for Musical Instrument Digital Interface and refers to a note oriented music file and transmission format. Many variations and improvements of this note oriented format exist. The use of the acronym MIDI should be broadly interpreted as also referring to any note oriented format for transmission or recording.
Performance
has three meanings in this field : -in a first meaning, it is an event in which a performer or group of (typically human) performers behave in a particular way (e.g. in their manner of singing or performing music) for another group of people. -in a second meaning it refers to a metric quantifying how well an entity (human, device, or process) deals with a specific aspect of a specific (not necessarily musical, e.g. mflops for a DSP processor in a synthesiser) task- in a third, narrower meaning, it is meant as the strict intersection of the above two meanings, i.e. quantifying the closeness of a performer's performance to a predetermined musical or singing reference i
Karaoke
(translation from the Japanese: "empty orchestra"; synonyms: KTV, Noraebang) Karaoke refers to singing into a microphone by amateur performers along e.g. recorded music or a music video, often with a lyrics display or with performance evaluation
Instrument karaoke
Playing a predetermined melody on a musical instrument or a musical instrument interface, often with score following along with recorded or synthesised accompaniment, often with means for evaluating or scoring the quality of the performance
Rhythm
Regular recurrence or pattern in time, associated concepts: meter, tempo, articulation and beat:
Expressivity
Musical properties which cannot be properly described by notions of harmony, rhythm, pitch, timbre or texture, and which are linked to a particular manner of execution of a musical piece, e.g. indications of mood, e.g. "dolce", or to corresponding note execution parameters such as vibrato or legato, some of which can be coded in communications protocols such as MIDI e.g. expressivity controller.
Polyphony
Ability of a synthesiser to simultaneously generate a limited number of unrelated melodic lines, Polyphony is conventionally quantified as the number of available "voices": a sound-generating device with six voices may be described as being, for example, six-voice polyphonicEach melodic line or simultaneous note requires one resource entity (for example a block of electronic hardware or a time-slot in a Digital Signal Processor program) capable of generating a single tone, and this is what is known as one "voice"
Voice
Has several important meanings in this field :- Resource entity (hardware, time slot) needed to generate a single tone or a single melodic line, in the context of polyphony. The term is generic, and is not meant to imply that the line should necessarily be vocal in character, instead referring to instrumentation or simply to register.This field-specific meaning of "voice" is relevant for G10H 1/18 selecting circuits; it is further defined in the definition of "polyphony" and in that of "part" - Sounds generated by vocal chords (e.g. human vocal folds) or synthetic versions thereof, e.g.: - as the medium of speech to communicate meaning; - for artistic musical purposes, e.g. with greater emphasis on melody or rhythm, as in singing, chorus, descant; or - for instrument control purposes (e.g. G10H 5/005 voice controlled instruments)
Speech
Definite vocal sounds that form words to express thoughts and ideas
Part
In addition to the usual meaning, a piece of a whole, a part has three more preci se meanings in a musical sense:- A part is a strand or melody of music played by an individual instrument or voice (or group of identical instruments or voices) within a larger work. In the context of polyphonic composition the term voice may be used instead of part to denote a single melodic line or textural layer. This field-specific meaning is very commonly used in connection with MIDI - A part also refers to the separate printed or manuscript copies of the music for each individual instrument in an ensemble or orchestra, as distinct from the score, which holds the music for all the instruments.- A part in great Highland Bagpipe music is a musical strain or sentence. Usually each part consists of four phrases, either one or two bars long. Several sentences combine to produce a paragraph or complete work or tune.
Audio signal
An audio signal is a representation of sound, usually electrical, in analog, digital or coded form, without restriction as to the category of sound being represented, e.g. speech, music, noise, The category of sound being represented, e.g. speech, music or noise, is primarily defined with respect to the features of the audio signal and with respect to the main intent of the source or performer. This category, as defined in this glossary, is very relevant for proper classification
Details of electrophonic musical instruments (keyboards applicable also to other musical instruments G10B, G10C; arrangements for producing a reverberation or echo sound G10K 15/08)
Definition statement
This subclass/group covers:

Details of electrophonic musical instruments, electrophonic musical tools, electrophonic musical data or electrophonic musical processing.

References relevant to classification in this group
This subclass/group does not cover:
Electrophonic musical instrument processor architecture
Instruments in which the tones are generated by electromechanical means
Voice controlled electrophonic musical instruments
Instruments in which the tones are generated by means of electronic generators
Real-time simulation of G10B, G10C, G10D-type instruments using recursive or non-linear techniques, e.g. waveguide networks, recursive algorithms
Sample based waveform production processes from data store samples in electrophonic musical instruments
Functions based waveform production processes with parameters stored in data store in electrophonic musical instruments
Informative references
Attention is drawn to the following places, which may be of interest for search:
Keyboards applicable also to other musical instruments
Arrangements for producing a reverberation or echo sound
Special rules of classification within this group

Documents dealing with details of musical instruments and which do not contain features corresponding to a subgroup of G10H 1/00 shall be classified in G10H 1/00 and appropriate Indexing Code G10H 2210/00 to G10H 2250/645.

Synonyms and Keywords

In patent documents the following words or abbreviations are often used:

ADSR
Attack Decay Sustain Release, an approach to note synthesis and note envelope control
IR
Impulse response or Infrared, depending on context
FIR
Finite impulse response
IIR
Infinite impulse response
Spint
Special Instrument, instrument with unusual features
PCM
pulse code modulation
WAV
Waveform audio file format
ADPCM
Adaptive Differential Pulse Code Modulation
CELP
Code excited linear prediction, used for audio coding
MP3, AC3, ATRAC
various audio compression formats
RFID
radio frequency identification
LFO
low frequency oscillator
VCF
Voltage controlled filter (see G10H 5/002)
CRC
Cyclical redundancy check
LZT
lead zirconate (piezoelectric sensors)
PDA
personal digital assistant, tablet computer
GSM
time division multiplexed mobile telephony standard
3D
three dimensional
DFT
discrete fourier transform
DCT
discrete cosine transform
FFT
fast fourier transform
IFFT
inverse fast fourier transform
Mplay
multiplayer
Velocity
volume of a note
{Associated control or indicating means (teaching of music per se G09B 15/00) }
Definition statement
This subclass/group covers:

Producing, processing or displaying musical information, status information or musical parameters, e.g. for information of the user or as control parameters, e.g. for controlling electrophonic musical instruments, indexing or retrieving musical data from musical databases.

Musical analysis of audio or music signals; extraction of musical parameters.

User interfaces for musicians, such as specialised displays.

Control of electrophonic musical instruments: This group is appropriate for classifying control details which are not otherwise provided for in all other groups in G10H 1/00.

Music databases relying on musical parameters which are the result of musical analysis, relate to composing or synthesis, e.g. wavetables or sound banks, include note oriented data, or are otherwise specifically meant for use by a device classified in electrophonic musical instruments.

Relationship between large subject matter areas

Audio data information retrieval, indexing or data structures relating to audio waveform synthesis should be classified in G10H 7/02 - G10H 7/12, e.g. audio sample libraries such as synthesiser wavetables, G10H 7/02.

General purpose audio data information retrieval using content features or bibliographical data associated with the audio data, e.g. libraries of PCM or MP3 audio files not indexed with musical parameters, and not used for composition or synthesis: G06F 17/3074.

References relevant to classification in this group
This subclass/group does not cover:
Means for the representation of music
Informative references
Attention is drawn to the following places, which may be of interest for search:
Information retrieval of audio data
Teaching of music per se
Chord or note indicators, fixed or adjustable, for keyboard of fingerboards
(musical transmission parameters, protocols, transmission or storage formats or encoding for transmission or storage
Special rules of classification within this group

Audio data information retrieval, indexing or data structures should be classified in G10H 1/0008 (if the invention is the index, index extraction or data structure) or G10H 1/0041 (if the nature of the stored musical data or associated metadata is important, e.g. different piano note samples at different playing loudnesses for a piano synthesiser) whenever they rely on musical parameters such as pitch, dynamics, harmony , timbre, texture, melody, rhythm or expressivity.

Audio data information retrieval, indexing or data structures relating to composing, e.g. musical collage, medley, should be classified in G10H 1/0025, along with musical rule bases, and databases of music fragments suitable for composing, organised according to a certain composing logic.

Libraries relating only to specific electrophonic musical instruments such as synthesisers, libraries generated or organized or managed by a music sampler, or libraries specifically organised or indexed to facilitate musical composing G10H 2210/101 ("composing"), G10H 2240/121 ("library").

{Recording/reproducing or transmission of music for electrophonic musical instruments (of accompaniment G10H 1/361) }
Informative references
Attention is drawn to the following places, which may be of interest for search:
Recording/reproducing of accompaniment for use with an external source, e.g. karaoke systems
Recording or reproducing of audio signals using Pulse Code Modulation [PCM]
{in coded form (see also G10H 7/002) }
Definition statement
This subclass/group covers:

Musical content recording, reproducing or storage or corresponding data formats or data structures, in coded form e.g. PCM, MP3, ADPCM; also corresponding metadata contents in cases the metadata includes musical parameters (transmission of musical contents G10H 1/0058, wireless transmission G10H 1/0083).

Musical data structures used for recording, e.g. in musical libraries such as wavetables or song fragments indexed with musical parameters such as tempo, chord, genre, for remix composing applications.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Instruments in which the tones are digitally synthesised from a data store using a common processing for different operations or calculations and a programme to control the sequence thereof
Special rules of classification within this group

The indication of additional groups in G10H 2240/121 for further definition of the musical library or G10H 2240/075 metadata should be given if appropriate. Also an indication of intended processes in G10H 2210/00 or G10H 2250/00, if applicable, should be given.

{Transmission between separate instruments or between individual components of a musical system (G10H 1/0083 takes precedence) }
Definition statement
This subclass/group covers:

Modes of transmission or transmission protocols, e.g. MIDI to or from an electrophonic musical instrument.

Any transmission, also when it is not music per se, even if it only represents control data or transmission of network information for electrophonic musical instruments: e.g. latency data transmission for music jamming over the internet (see also G10H 2240/175 ("transmission jams")), S10H241/281 transmission protocols specially used for musical instruments.

References relevant to classification in this group
This subclass/group does not cover:
Transmission between separate instruments or between individual components of a musical system using wireless transmission, e.g. radio, light, infrared
{using wireless transmission, e.g. radio, light, infrared}
Special rules of classification within this group

Whenever a wireless aspect is important for an electrophonic musical instrument, then it should be coded here (ignore the hierarchy), regardless of whether music or other control data is transmitted.

{Means for obtaining special acoustic effects (combined with modulation G10H 1/043) }
Definition statement
This subclass/group covers:

Musical effects not otherwise provided for, e.g. DJ scratch effects.

References relevant to classification in this group
This subclass/group does not cover:
Aspects of games using an electronically generated display having two or more dimensions, e.g. 3D sound effects in virtual videogame spaces
Means for controlling the tone frequencies, e.g. attack, decay; Means for producing special musical effects, e.g. vibrato, glissando
Means for controlling the tone frequencies by additional continuous modulation
Circuits for establishing the harmonic content of tones, by combining tones, for obtaining chorus, celeste or ensemble effects
Means for processing the signal picked up from the strings, for distorting the signal, e.g. to simulate tube amplifiers
Arrangements for producing a reverberation or echo sound
Informative references
Attention is drawn to the following places, which may be of interest for search:
Stereophonic Systems, e.g. Electronic adaptation of multi-channel audio signals to reverberation of the listening space
H04S7/00E6
Accompaniment arrangements: Chord
Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel: reproducing continuously a part of the information, i.e. repeating
Special rules of classification within this group

Classification G10H 1/0091 should also be assigned whenever details of turntable-like DJ interfaces covered by G11B 27/005 go beyond mere mechanical details of the turntable and include details about the generation of audio control signals, e.g. MIDI, or real-time audio signal processing details specifically for providing the DJ scratch effect.

Indexing Codes of the Indexing Code main group G10H 2210/155 ("effect") shall be assigned to define effect types.

Means for controlling the tone frequencies, e.g. attack, decay; Means for producing special musical effects, e.g. vibrato, glissando { (for instruments using voltage controlled oscillators and amplifiers or voltage controlled oscillators and filters G10H 5/002) }
Definition statement
This subclass/group covers:

The time dependent control of:

  • Amplitude modulation of musical signal in general, e.g. envelope, dynamics, ADSR,
  • Pitch modulation of a musical signal in general, e.g. glissando, vibrato.

The control of tone colour modulation of musical signal (e.g. spectral contents, timbre variation, filtering).

Informative references
Attention is drawn to the following places, which may be of interest for search:
Instruments using voltage controlled oscillators and amplifiers or voltage controlled oscillators and filters
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
ADSR
denotes a form of envelope used for synthesizing a tone which is split into four time segments: Attack, Decay, Sustain, Release. An ADSR envelope is defined by an attack time, decay time, sustain level and release time
Attack time
is the time taken for initial run-up of level from nil to peak, beginning when the key is first pressed
Decay time
is the time taken for the subsequent run down from the attack level to the designated sustain level
Sustain level
is the level during the main sequence of the sound's duration, until the key is released
Release time
is the time taken for the level to decay from the sustain level to zero after the key is released
by acousto-mechanical means, e.g. rotating speakers or sound deflectors
Definition statement
This subclass/group covers:

Continuous modulation by acousto-mechanical means.

Electronic or computer simulations of the effect of such acousto-mechanical means, e.g. Leslie effect.

by switches with variable impedance elements
Definition statement
This subclass/group covers:

Electric or mechanical switches or analogue control elements with variable impedance for controlling electrophonic musical instruments or computer music interfaces.

Analogue variable impedance elements, e.g. strain gauge, potentiometer, variable inductor, as used in electrophonic musical instruments, regardless of its control effects.

Indexing Codes G10H 2220/275 (input key switch) and G10H 2220/561 (transducer resistor) represent additional aspects which should be considered for finer classification.

Circuits for establishing the harmonic content of tones, { or other arrangements for changing the tone colour}
References relevant to classification in this group
This subclass/group does not cover:
Time-dependent modulation of amplitude or pitch parameters
by non-linear elements (G10H 1/14 takes precedence; generation of non-sinusoidal basic tones G10H 5/10)
References relevant to classification in this subclass
This subclass/group does not cover:
Circuits for establising the harmonic content of tones during execution
Informative references
Attention is drawn to the following places, which may be of interest for search:
Generation of non-sinusoidal basic tones
Special rules of classification within this group

If the nonlinear element e.g. semiconductor such as JFET or diode, is used for voluntary distortion of existing audio waveforms for musical purposes, then G10H 3/187 should be assigned as well, irrespective of whether it is used with a string instrument or not.

for suppressing tones; Preference networks
Definition statement
This subclass/group covers:

Selecting which notes or voices to suppress from polyphonic music, e.g. to alleviate the effects of insufficient hardware capabilities or to save processing power.

Also covers deliberately simplifying polyphony or melody, suppressing notes for correcting errors in music signal transmission (e.g. frozen notes due to a missing note-off command).

Special rules of classification within this group

When applicable, also classify in Indexing Code group G10H 2230/041 if processor load is important, for mobile telephones see Indexing Code group G10H 2230/021 for mobile ringtones.

for selecting plural preset register stops
Definition statement
This subclass/group covers:

Details specifically dealing with relevant aspects of selection of different tone colours or instrument voices, e.g. piano, violin, trumpet.

for automatically producing a series of tones (musical toys A63H 5/00)
Definition statement
This subclass/group covers:

Automatically producing a predetermined and unchangeable sequence of musical tones upon initial triggering, specifically dealing with musical parameters.

Circuits for musical cards or the like, algorithmically producing a pre-programmed, unchangeable melody, e.g. from a coded sequence of tones in a ROM.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Musical or noise- producing devices for additional toy effects other than acoustical
Constructional details
Definition statement
This subclass/group covers:

Mechanical details of electrophonic musical instruments, where such mechanical details are not otherwise provided for.

This includes for example:

  • Details of the body, frame, casing, electronic keyboard cover lid,
  • Ergonomic details such as shape of its body, position of its connectors,
  • Portability aspects, shoulder straps,
  • Power supply arrangements,
  • Unusual details of the appearance of the electrophonic instrument.
Special rules of classification within this group

Indexing Codes under G10H 2230/00 provide additional subdivisions for indexing features of constructional details.

Indexing Code symbol under G10H 2230/045 relating to "spint" (special instrument) shall be used for classifying electrophonic instruments according to their similarity to, or improvement to, a specific conventional acoustic instrument type, shape, usage, characteristic feature, sound signature or overall character in combination with G10H 1/32 if mechanical constructional details are involved and if a suitable special instrument category is listed as Indexing Code.

Switch arrangements, e.g. keyboards or mechanical switches peculiar to electrophonic musical instruments ( {G10H 1/055 takes precedence} ; keyboards applicable also to other musical instruments G10B, G10C)
Definition statement
This subclass/group covers:

Constructional details at keyboard level or key level, mechanisms linked to individual keys or keyboards.

Key-like user input controls for electrophonic musical instruments, e.g. pedals, touchscreen active zones, not only including mechanical switches with contacts, but also switches in a generalised sense, e.g. light barriers, even with continuously varying output.

References relevant to classification in this subclass
This subclass/group does not cover:
Controlling tone frequencies by continuous modulation by switches with variable impedance elements
Informative references
Attention is drawn to the following places, which may be of interest for search:
Keyboards applicable to acoustic instruments
Special rules of classification within this group

G10H 1/34 should be used when the arrangement of multiple keys with respect to one another is ergonomically or musically important (whole keyboard features).

G10H 1/344, G10H 1/346 or G10H 1/348 should be restricted to constructional details at key level, e.g. mechanisms linked to individual keys, whole keyboard arrangements should be classified in G10H 1/34 or G10H 1/342.

Indexing Codes provide additional subdivision: see G10H 2220/265 (“input key”), G10H 2220/221 ("input keyboard"); for continuous keyboards see G10H 2210/401 ("scale microtonal").

Processing information on key actuation: see key multiplexing G10H 1/182.

Accompaniment arrangements
Definition statement
This subclass/group covers:

Accompaniment systems, e.g. karaoke.

G10H 1/361 also includes instrument karaoke, in which the performer does not sing to recorded music but is expected to play a specific melody on an instrument in synchrony with recorded music.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Teaching of music per se
Special rules of classification within this group

Whenever accompaniment systems unrelated to karaoke are allocated in G10H 1/361 or subgroups thereof, Indexing Code G10H 2210/005 (“accompaniment”) should be assigned if applicable.

karaoke systems per se should be classified in G10H 1/361 and subgroups, but not in G10H 1/36.

The JPO classifies karaoke in FI and IPC G10K 15/04, with a detailed cross-indexing in FT 5D108. Search in those fields is necessary for any complete search involving karaoke.

{displaying animated or moving pictures synchronized with the music or audio part}
Definition statement
This subclass/group covers:

Features specific to synchronisation of musical parameters to moving images, musical accompaniment of slide shows, background music dependence on videogame environment or videogame character actions.

Features specific to karaoke synchronized with animated pictures (karaoke lyrics G10H 1/0008, G10H 2220/011 display lyrics).

Musical games where user actions on musical parameters are expected to be synchronized to music and video, e.g. rhythmic hopscotch type games such as Dance Revolution.

Generation of artistic images related to music parameters (informative musical displays G10H 1/0008).

Rhythm (metronomes G04F 5/02)
Definition statement
This subclass/group covers:

Analysis of rhythmic information such as tempo, timing, e.g. of onsets, beat.

Processing of rhythmic information for processing music, such as selecting music from a database, music composition.

Generation of rhythmic information for use in electrophonic musical instruments: e.g. timing control, timing processing, timing classification, timing synchronisation, timing encoding of musical data, synthesis of rhythmic information.

Display of rhythmic information in music such as tempo, timing, beat, onsets.

References relevant to classification in this group
This subclass/group does not cover:
Synchronisation of music with video
Informative references
Attention is drawn to the following places, which may be of interest for search:
Training appliances or apparatus for special sports: for running, jogging or speed-walking
Metronomes
Modification of at least one characteristic of speech waves: time compression or expansion
Special rules of classification within this group

Beat or rhythm synchronisation of two successive pieces, e.g. in remix, also consider G10H 7/008 in addition to G10H 1/40.

For rhythms selected according to exercising or body rhythms, also consider A63B 69/00 in addition to G10H 1/40.

For databases with tempo or rhythm indexing, please consider a dual classification in G06F 17/3074 and G10H 1/0041 in addition to G10H 1/40.

Volume control
Definition statement
This subclass/group covers:

Volume control specifically provided in electrophonic musical instruments: e.g. MIDI volume control, MIDI velocity controller, volume control for electric guitars, for musical keyboards.

Instruments in which the tones are generated by electromechanical means
Definition statement
This subclass/group covers:

Instruments in which a mechanically moving part is caused to move at the frequency of the generated note, and in which this movement is sensed by a movement sensor other than a microphone.

Details of movement transducers therefor, e.g. magnetic guitar pick-up;

Instrument-specific adaptations for contact microphones.

Audio signal processing specially adapted for further musical processing of signals from said transducers or for musical parameter extraction.

Percussion synthesis or drumpad triggers, even if the mechanically moving part is non-resonant, i.e. does not have a frequency of oscillation, see in particular G10H 3/146.

References relevant to classification in this group
This subclass/group does not cover:
Microphones or loudspeakers
Loudspeaker enclosures:
Special adaptations for use as contact microphones, e.g. on musical instrument, on stethoscope
Loudspeaker enclosure specifically adapted to a musical instrument and interacting with musically, structurally or ergonomically relevant parts of the musical instrument
Acoustic musical instruments equipped with microphones or microphone e.g. microphone positioning on specific acoustic instruments; musical instruments
{Extracting or recognising the pitch or fundamental frequency of the picked up signal}
Definition statement
This subclass/group covers:

Any pitch analysis for musical parameter extraction of an audio signal not specifically using a mechanical resonant generator.

This includes: note extraction, score transcription, performance evaluation e.g. of karaoke singing, pitch processing for query by humming.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Pitch determination of speech signals in general
G10L11/04

Special rules of classification within this group

Relevant Indexing Codes under G10H 2210/031 ("analysis") must be assigned.

Additional classification under G10H 1/40, e.g. associated beat or note onset timing analysis or G10H 1/0008, e.g. other types of musical analysis is frequent.

Database retrieval based on pitch queries, classified both in G10H (e.g. G10H 3/12, G10H 1/0008, G10H 1/0041 if the emphasis is on the pitch analysis algorithm, the type of indexing, or the data structure or metadata organisation of the musical parameters derived from pitch analysis) and G06F 17/3074.

{using a membrane, e.g. a drum; Pick-up means for vibrating surfaces, e.g. housing of an instrument}
Definition statement
This subclass/group covers:

Electronic drums (see also Indexing Code G10H 2230/275 ("spint drums"));

Vibration sensors sensing the vibrations of instrument bodies, also of guitars or other stringed instruments.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Guitars used as percussion instruments
Special rules of classification within this group

This group is also appropriate for classifying anything related to percussion synthesis, even if not using a membrane or a vibrating surface, e.g. optically triggered drum sounds drum triggers, non-resonant drumpads, sensors therefor.

It is essential in this group to assign enough classification symbols to be able to quickly retrieve the specific type of percussion, e.g. a hihat pedal typically would be coded here, in G10H 1/348, and in the Indexing Code G10H 2250/435 (“Gensound percussion”) and especially in the relevant subdivisions of Indexing Code G10H 2230/251 (“Spint percussion"), e.g. G10H 2230/331 (“Spint cymbal hihat”).

Instruments in which the tones are generated by means of electronic generators (G10H 7/00 takes precedence)
Definition statement
This subclass/group covers:

Generation of musical tones by analogue electronic circuits.

Voice controlled instruments, even if the voice processing is performed by computer, and even if the output tone is synthesised from a data store.

Physical modelling of acoustic instruments, e.g. implemented by appropriate software.

Simulation of analogue circuits using digital means.

References relevant to classification in this group
This subclass/group does not cover:
Instruments in which the tones are synthesised from a data store, e.g. computer organs
{Voice controlled instruments}
Definition statement
This subclass/group covers:

Electrophonic musical instruments in which the output sound is controlled by processing the human voice or glottal signals of the performer in order to control parameters of the output audio signals, e.g. a trumpet sound, controlled by voice.

This is the correct classification for voice-controlled instruments even if the musical voice processing is performed by computer, and even if the output tone is synthesised from a data store under the control of the processed voice signals.

References relevant to classification in this group
This subclass/group does not cover:
Recording/reproducing of accompaniment for use with an external source, e.g. karaoke systems: with means for modifying or correcting the external signal, e.g. pitch correction, reverberation, changing a singer's voice
Informative references
Attention is drawn to the following places, which may be of interest for search:
Mere pitch determination of a musical or singing signal
Musical analysis of a singing voice signal, including other aspects than pitch
Pitch determination of speech signal in general
G10L11/04
{Real-time simulation of G10B, G10C, G10D-type instruments using recursive or non-linear techniques, e.g. waveguide networks, recursive algorithms (establishing the harmonic content of tones by non-linear elements G10H 1/16; synthesising waveforms using a recursive algorithm G10H 7/12) }
Definition statement
This subclass/group covers:

Physical modelling of acoustic instruments implemented by digital or analogue means (e.g. using computer based simulation).

Informative references
Attention is drawn to the following places, which may be of interest for search:
Establishing the harmonic content of tones by non-linear elements
Synthesising waveforms using a recursive algorithm
Instruments in which the tones are synthesised from a data store, e.g. computer organs (synthesis of acoustic waves not specific to musical instruments G10K 15/02, G10L)
Definition statement
This subclass/group covers:

Computer architecture, computing hardware or waveform computation schemes specific to digital music synthesis.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Synthesis of acoustic waves not specific to musical instruments
Special rules of classification within this group

The G10H 7/00 main group is to be used to classify specific details of:

  • Music synthesiser architecture;
  • Musical signal processor architecture for musical analysis or musical processing (see narrow definition of "musical") in the glossary;
  • Processor load management or waveform processing not otherwise provided by sub-groups of G10H 1/18 or G10H 1/02 respectively;
  • For all sub-groups of G10H 7/00, Indexing Codes under G10H 2230/00 ("hardware, shape or architecture aspects") and G10H 2240/00 ("data or communications aspects") provide an orthogonal scheme for indexing features of sub-groups of G10H 7/00;
  • As the G10H 7/00 groups are very imprecise regarding actual function, if there are relevant classes in G10H 1/00, G10H 3/00 or G10H 5/007 or G10H 5/005, or corresponding Indexing Codes, they should be systematically assigned in addition to the G10H 7/00 symbols.
{Means for controlling the transition from one tone waveform to another (glissando or legato per se G10H 1/02) }
Definition statement
This subclass/group covers:

Transition processing or controlling from one tone or music waveform to another, or from one music segment or music piece to another; means therefor.

Informative references
Attention is drawn to the following places, which may be of interest for search:
Glissando or legato per se
Special rules of classification within this group

Documents classified here should be given Indexing Codes under G10H 2210/101 (“composing”; e.g. G10H 2210/125 ("composing medley")), G10H 2250/00 (e.g. G10H 2250/035 ("crossfade")) or G10H 2250/541 ("waveform").

in which amplitudes at successive sample points of a tone waveform are stored in one or more memories
Informative references
Attention is drawn to the following places, which may be of interest for search:
Recording or reproducing of audio signals using Pulse Code Modulation [PCM]
Special rules of classification within this group

Documents classified here should be given Indexing Codes under G10H 2250/541 ("waveform").

This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013