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CLASS 360,	DYNAMIC MAGNETIC INFORMA- TION STORAGE OR RETRIEVAL
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SECTION I - CLASS DEFINITION

GENERAL STATEMENT OF THE CLASS SUBJECT MATTER

This class is an integral part of Class 369, Dynamic Information Storage or Retrieval, following subclass 18 and is the specific class for apparatus and corresponding processes for the storage and retrieval of information based on relative movement between a magnetic record carrier and a transducer.

This class also includes apparatus and corresponding processes for making copies or editing of records falling within the above definition.

A magnetic record carrier within the meaning of this class is an element which consists of a magnetizable material or is comprised of a coating or impregnation of magnetizable material which is intended for the storage of more than a single bit of information. Storage elements which include discrete magnetic areas, inserts, spots, etc. each intended for the storage of single bits of information, whether or not relative motion is used in transducing that information, are not included in the above definition. See elsewhere for the use of such elements. (See References to Other Classes, below.)

SUBCOMBINATIONS OF DYNAMIC MAGNETIC RECORDERS OR REPRODUCERS

This class includes elements forming subcombinations specific to apparatus within the class definition such as record carriers, transducers, etc.

Electrical circuits not specific to magnetic recording or reproducing which may constitute subcombinations of such apparatus are classified in the appropriate class for such circuits.

Mechanisms forming subcombinations of apparatus within the class definition are classified in the appropriate mechanical class providing for such subject matter unless claimed in significant combination with specific recorder structure.

SECTION II - LINES WITH OTHER CLASSES AND WITHIN THIS CLASS

COMBINATIONS OF OTHER APPARATUS WHICH INCLUDE APPARATUS OF THIS CLASS

Significantly claimed apparatus external to this class, claimed in combination with apparatus under the class definition, which records or reproduces some quality or quantity related to such external apparatus or its function, is classified in the class appropriate to the external apparatus.

Nominally claimed apparatus external to this class, claimed in combination with apparatus under the class definition, is classified in this class unless provided for in the appropriate external class.

Because of the placement of Class 360 into the Class 369 schedule, this class is no longer exhaustive of dynamic magnetic storage or retrieval, as to the art now classified in subclasses 1 through 18 of Class 369.

ORGANIZATION OF THIS CLASS

For the organization of this class, refer to Subclass References to the Current Class, below.

SECTION III - SUBCLASS REFERENCES TO THE CURRENT CLASS

SEE OR SEARCH THIS CLASS, SUBCLASS:

SECTION IV - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

SUBCLASSES

1	RECORDING ON OR REPRODUCING FROM AN ELEMENT OF DIVERSE UTILITY
	This subclass is indented under the class definition.  Subject matter which includes recording on or reproducing from an element which has utility in addition to being a magnetic record carrier. (1) Note. Examples of devices classified herein are devices which record on or reproduce from razor blades, tire beads, food cans, price tags, etc. (2) Note. Elements used as record carriers in this and indented subclasses which are not inherently magnetic may have magnetic strips, coatings or other magnetic elements affixed thereto to allow for their use as magnetic record carriers.

2	Card
	This subclass is indented under subclass 1.  Subject matter wherein the element used as a record carrier is in a flat geometric form. SEE OR SEARCH CLASS: 235,  Registers,   subclass 449 and 450 for sensing mechanisms utilized to sense discrete bits of magnetic material, the discrete bits being coded markings on a record. 434,  Education and Demonstration,   subclass 308 and indented subclasses, particularly subclasses 311+ for card shaped elements used in teaching and having information recorded thereon.

3	Motion picture film
	Subject matter under subclasses 1 wherein the element used as a record carrier is a motion picture film. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   subclasses 1+ for sound recording and reproducing combined with motion pictures.

4	MANUAL INPUT RECORDING
	This subclass is indented under the class definition.  Subject matter including apparatus which is to be manually manipulated and it is the manipulation of such apparatus which generates the information signal that is to be recorded. SEE OR SEARCH CLASS: 400,  Typewriting Machines,   appropriate subclasses for machine operators including magnetic records.

5	RECORDING FOR SELECTIVE RETENTION OF A SPECIAL OCCURRENCE
	This subclass is indented under the class definition.  Subject matter for automatically sensing the occurrence of a condition, retaining information concerning that occurrence and deleting or disregarding unwanted information. (1) Note. Examples of devices classified herein are crash, transient and surveillance recorders. SEE OR SEARCH CLASS: 369,  Dynamic Information Storage or Retrieval,   subclasses 47.36 through 47.55for mechanism control by control signal.

6	RECORDING COMBINED WITH METERING OR SENSING
	This subclass is indented under the class definition.  Subject matter in combination with meters or sensors of particular application. (1) Note. See Lines With Other Classes and Within This Class, Combinations of Other Apparatus Which Include Apparatus of This Class, in the Class Definition, above. (2) Note. Examples of devices classified herein are recorders associated with utility meters, sensors of seismic or other natural phenomena and body tissue analyzing devices. (3) Note. Ordinary sound microphones and video cameras are not considered sensors of particular application as defined above. Recorders in combination with such microphones or cameras are classified in subclasses provided below. SEE OR SEARCH CLASS: 346,  Recorders,   subclasses 14 through 18,for non-magnetic recorders combined with registers, indicators or alarms.

7	RECORDING FOR MONETARY DELAY OF AN ANALOG SIGNAL
	This subclass is indented under the class definition.  Subject matter wherein a nondigital signal is recorded and momentarily reproduced for the specific purpose of introducing a delay in the signal. (1) Note. Apparatus classified herein is used for purposes such as censoring and generating artificial reverberation. SEE OR SEARCH THIS CLASS, SUBCLASS: 54, for recirculation or delay of a digital signal.

8	RECORDING FOR CHANGING DURATION, FREQUENCY OR REDUNDANT CONTENT OF AN ANALOG SIGNAL
	This subclass is indented under the class definition.  Subject matter specifically arranged for recording or reproducing a signal in such a manner that the signal, as recorded, has redundant portions deleted therefrom or, as reproduced, occupies a different amount of time or a different band of frequencies than that occupied by the original signal. (1) Note. Changes in either or both of duration and frequency may be produced by the subject matter of this and indented subclasses. SEE OR SEARCH CLASS: 704,  Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression,   subclasses 500 through 504for bandwidth, or time compression, or expansion of audio signals.

12	RECORDING OR REPRODUCING FOR AUTOMATIC ANNOUNCING
	This subclass is indented under the class definition.  Subject matter for recording or reproducing information in such a manner that an appropriate announcement may be selected or synthesized in response to a sensed condition or predetermined command. (1) Note. Examples of devices classified herein are: Time or temperature announcing machines, talking voltmeters and travelogue reproducers responsive to location. SEE OR SEARCH CLASS: 379,  Telephonic Communications,   subclasses 41 and 67+ for subject matter of this type in combination with a telephone.

13	RECORD EDITING
	This subclass is indented under the class definition.  Subject matter for deleting, adding or rearranging portions of a recording. (1) Note. Both manual cutting and splicing of record carrier portions and reproducing from one record carrier and recording onto the same or another record carrier are included in this subclass.

15	RECORD COPYING
	This subclass is indented under the class definition.  Subject matter for duplicating records. SEE OR SEARCH CLASS: 369,  Dynamic Information Storage or Retrieval,   subclasses 84+ for duplicating nonmagnetic sound records.

16	Contact transfer
	This subclass is indented under subclass 15.  Subject matter wherein a blank record carrier is placed in contact with the record carrier to be copied and duplication occurs at the point of contact.

17	With magnetic bias
	This subclass is indented under subclass 16.  Subject matter wherein a magnetic field in addition to that of the record carrier to be copied is applied at the point of contact.

18	RECORDING OR REPRODUCING PLURAL INFORMATION SIGNALS ON THE SAME TRACK
	This subclass is indented under the class definition.  Subject matter wherein separate information signals are recorded in such a manner that they occupy co-extensive or overlapping areas on a record carrier and, during reproduction, are again separable. (1) Note. Separable components of single signals such as video and synchronizing components of a normal television signal or data and timing components of a digital signal are not considered separate information signals within the meaning of the above definition. SEE OR SEARCH THIS CLASS, SUBCLASS: 33+, for recording television signals including synchronizing components. 39+, for recording digital signals including timing components. SEE OR SEARCH CLASS: 370,  Multiplex Communications,   appropriate subclasses for multiplexing systems and techniques.

20	Frequency multiplex
	This subclass is indented under subclass 18.  Subject matter wherein the separate signals occupy different frequency bands.

21	Head gap azimuth multiplex
	This subclass is indented under subclass 18.  Subject matter wherein the separate signals are recorded using a head or heads with gaps positioned at different angles with respect to the record carrier for each of the separate signals.

22	SPLITTING ONE INFORMATION SIGNAL FOR RECORDING ON PLURAL DISTINCT TRACKS OR REPRODUCING SUCH SIGNAL
	This subclass is indented under the class definition.  Subject matter wherein a single information signal is divided and recorded on plural distinct tracks or reproduced from such tracks and recombined into a single signal. (1) Note. Transverse track portions such as that produced by moving a head at an angle to the direction of movement of a tape are not considered distinct tracks within the meaning of the above definition. SEE OR SEARCH THIS CLASS, SUBCLASS: 26, for electronically correcting phasing errors between signals which may be recorded on plural distinct tracks. 76, for physically moving a multi-track head with respect to a record for skew correction.

23	Time division
	This subclass is indented under subclass 22.  Subject matter wherein the signal is divided into increments separate in time and sequential increments are commutated between plural distinct tracks.

24	SPLITTING, PROCESSING AND RECOMBINING ONE INFORMATION SIGNAL FOR RECORDING OR REPRODUCING ON THE SAME TRACK
	This subclass is indented under the class definition.  Subject matter wherein a signal is divided, the divided portions are separately processed and are then recorded on the same track of a record carrier. (1) Note. Apparatus wherein a single reproduced signal is divided, separately processed and recombined is also included in this subclass. SEE OR SEARCH CLASS: 327,  Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclasses 407+ for miscellaneous gating of plural inputs to a single output.

25	CHECKING RECORD CHARACTERISTICS OR MODIFYING RECORDING SIGNAL FOR CHARACTERISTIC COMPENSATION
	This subclass is indented under the class definition.  Subject matter wherein the characteristics of a particular record carrier are determined or a signal to be recorded is modified to compensate for the determined characteristics of a particular record carrier. (1) Note. Examples of record carrier characteristics are: inhomogeneous magnetic coating, incomplete erasure of a prior recording and peculiar hysteresis. (2) Note. Characteristics of magnetic recording or reproducing which are dictated by physical law and are not attributable to peculiarities of the record carrier are not included in this subclass. SEE OR SEARCH THIS CLASS, SUBCLASS: 65, for equalization circuits.

26	ELECTRONICALLY CORRECTING PHASING ERRORS BETWEEN RELATED INFORMATION SIGNALS
	This subclass is indented under the class definition.  Subject matter which is electronic in nature (e.g., adjustable delay lines, gates, registers) for producing time coincidence between plural related information signals. SEE OR SEARCH THIS CLASS, SUBCLASS: 51, for apparatus which corrects timing errors in a digital signal. 76, for apparatus which physically moves multiple track heads to produce an effect similar to that of the apparatus of this subclass. SEE OR SEARCH CLASS: 386,  Television Signal Processing for Dynamic Recording or Reproducing,   subclass 41 for phase control of carrier signal in a recorded color television signal. 714,  Error Detection/Correction and Fault Detection/Recovery,   the appropriate subclass for an error checking system and subclass 700 for generic skew detection or correction.

27	RECORDING OR REPRODUCING AN INFORMATION SIGNAL AND A CONTROL SIGNAL FOR CONTROLLING ELECTRONICS OF REPRODUCER
	This subclass is indented under the class definition.  Subject matter wherein, during recording of an information signal, a control signal is generated and recorded and is used during reproduction to control the electronic circuitry through which the information signal is processed. (1) Note. The control signal used herein is distinct from or in addition to the normal clock and synchronizing signals associated with digital and video signals, respectively. SEE OR SEARCH THIS CLASS, SUBCLASS: 13+, for magnetic record editing where a recorded control signal may be used. 51, for controlling digital signal reproduction using clock signals. 69+, for controlling the recorder mechanism in response to a recorded control signal. SEE OR SEARCH CLASS: 386,  Television Signal Processing for Dynamic Recording or Reproducing,   subclass 16 for time correction of a recorded color television signal using a recorded reference signal.

28	Reference carrier to control demodulator
	This subclass is indented under subclass 27.  Subject matter wherein the control signal is a recorded reference carrier which is used to control the demodulation of the reproduced information signal.

29	MODULATING OR DEMODULATING
	This subclass is indented under the class definition.  Subject matter including specific modulator or demodulator circuitry or techniques. SEE OR SEARCH CLASS: 329,  Demodulators,   appropriate subclasses for demodulators of general utility. 332,  Modulators,   appropriate subclasses, for modulators and demodulators of general utility.

30	Frequency
	This subclass is indented under subclass 29.  Subject matter including specific frequency modulation or demodulation of a signal.

31	MONITORING OR TESTING THE PROGRESS OF RECORDING
	This subclass is indented under the class definition.  Subject matter wherein, during recording, the recorded information signal is reproduced in whole or in part for qualitative analysis of the operation of the recorder system or a part thereof. SEE OR SEARCH THIS CLASS, SUBCLASS: 25, for record carrier characteristic determination and compensation. 53, for digital data error checking.

32	CONVERTING AN ANALOG SIGNAL TO DIGITAL FORM FOR RECORDING; REPRODUCING AND RECONVERTING
	This subclass is indented under the class definition.  Subject matter including producing a digital equivalent of a nondigital signal for recording, or producing a nondigital equivalent of a reproduced digital signal. SEE OR SEARCH CLASS: 235,  Registers,   subclasses 321+ , for analog-digital converters.

39	GENERAL PROCESSING OF A DIGITAL SIGNAL
	This subclass is indented under the class definition.  Subject matter of specific utility in treating a digital signal for recording or reproducing. (1) Note. This subclass is the residual area for devices and methods concerned with processing digital signals in a manner not provided for above. Digital signal processing properly classified above should not, as a matter of course, be cross-referenced here. (2) Note. Although specific mechanical apparatus may be included in the subject matter of this and indented subclasses, the subject matter herein remains generally electronic in nature and its utility is in distinctive handling of a digital signal. SEE OR SEARCH THIS CLASS, SUBCLASS: 55+, for generally usable recording or reproducing techniques. 69+, for automatically controlling recorder or reproducer mechanisms. 79, for recorder or reproducer control of an external device 81+, 88 and 101, for recorder or reproducer mechanisms. 220 through 224, 230-237.1, 240-246.8, 110-130.34, and 131-136, for recorder or reproducer elements. SEE OR SEARCH CLASS: 178,  Telegraphy,   appropriate subclasses, particularly 17+ for code recorders. 235,  Registers,   subclasses 61+ , for calculators combined with recorders. 326,  Electronic Digital Logic Circuitry,   for electronic digital circuits operating on a digital signal. 327,  Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclasses 1+ for pulse discriminating or selecting and subclasses 100+ for pulse parameter (e.g., amplitude) control. 341,  Coded Data Generation or Conversion,   subclass 15 for a magnetic pattern reading type analog to digital converter and subclasses 50+ for code converters. 365,  Static Information Storage and Retrieval,   appropriate subclass for the static storage/retrieval of information. 700,  Data Processing: Generic Control Systems or Specific Applications,   subclasses 1 through 89for general-purpose digital control systems (e.g., computer arrangements for open and closed loop feedback control). 708,  Electrical Computers: Arithmetic Processing and Calculating,   subclasses 100+ for digital calculating computers and generic digital arithmetic processing circuits and methods. 711,  Electrical Computers and Digital Processing Systems: Memory,   subclasses 1+ for addressing combined with specific memory configurations (e.g., extended, expanded, dynamic, etc.) in a digital data processing system, subclasses 100+ for generalized address forming, and subclasses 200+ for generalized storage accessing and control in a digital data processing system. 714,  Error Detection/Correction and Fault Detection/Recovery,   subclasses 1+ for reliability and availability in a digital data processing system.

40	In specific code or form
	This subclass is indented under subclass 39.  Subject matter including generating a waveform from digital data or reproducing such a waveform, the frequency, shape, polarity or other characteristic thereof being indicative of the digital data. SEE OR SEARCH CLASS: 341,  Coded Data Generation or Conversion,   appropriate subclasses for code converters.

41	Nonreturn to zero
	This subclass is indented under subclass 40.  Subject matter wherein a first or opposite polarization of the record throughout an entire bit cell is indicative of a first or second binary digit and transitions in polarity occur only between unlike digits. Example:

42	Phase code
	This subclass is indented under subclass 40.  Subject matter wherein a transition in polarity in a first direction is indicative of a first binary digit and a transition in polarity in an opposite direction is indicative of the second binary digit. Example:

43	Multi-frequency
	This subclass is indented under subclass 40.  Subject matter wherein a first binary digit is indicated by one full cycle of the waveform per bit cell and the second binary digit is indicated by one-half cycle of the waveform per bit cell. Example:

44	Intra-cell transition
	This subclass is indented under subclass 40.  Subject matter wherein a transition in polarity occurs within the boundaries of each bit cell and the position of that transition is indicative of the data recorded. Example:

45	Pulse crowding correction
	This subclass is indented under subclass 39.  Subject matter wherein the fringing effects of high density recording are subdued.

46	Head amplifier circuit
	This subclass is indented under subclass 39.  Subject matter including circuitry proximate to the recording transducer for producing sufficient current in response to an input signal to properly polarize the record.

47	Redundant or complimentary tracks
	This subclass is indented under subclass 39.  Subject matter wherein the same data is recorded in plural tracks in the same or complimentary forms.

48	Data in specific format
	This subclass is indented under subclass 39.  Subject matter wherein the data is recorded in words or blocks of specific numbers of bits or wherein words or blocks of data are arranged in a specific manner on the record.

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