Manual of U.S. Patent Classification
as of June 30, 2000

Class
341
CODED DATA GENERATION OR CONVERSION

Class definitions may be accessed by clicking on the class title, above.
Subclass definitions may be accessed by clicking on the subclass number, below.

Patents classified in a subclass may be accessed by clicking on the " " icon following the subclass number, below.

( please note that links to definitions and classified patents may not be available for some classes and subclasses )

For search strategies, please refer to the Classification Index Explanation of Data web page.

Subclass		Title
ClassTitle		===> CODED DATA GENERATION OR CONVERSION
1		DIGITAL PATTERN READING TYPE CONVERTER
2		. Plural denominationally related carriers (e.g., coarse/fine geared discs)
3		. Plural types of codes on single carrier
4		. According to nonlinear function
5		. For X or Y coordinate determination (e.g., stylus-pad)
6		. With directional discrimination
7		. Antiambiguity feature
8		. Real and complementary patterns
9		. Having combined (e.g., denominational, combination code) coding pattern
10		. . Constant distance code
11		. Incremental
12		. Cathode ray
13		. Optical
14		. . Having optical waveguide
15		. Magnetic, inductive or capacitive
16		. Brush and contacts or conductive pattern
17		. Actuated by physical projection
20		BODILY ACTUATED CODE GENERATOR
21		. For handicapped user
22		. Including keyboard or keypad
23		. . Variable key legends
24		. . With error prevention means (e.g., debounce, antichatter)
25		. . . With rollover feature (i.e., antidoublestrike)
26		. . With particular key scanning feature
27		. . With audible or tactile indicator
28		. . For pictorial or ideographic characters (e.g., design, chinese or japanese characters)
29		. . With variable pulse spacing or grouping
30		. . For numerical pulse type transmission
31		. . Photoelectric actuation
32		. . Magnetic or inductive actuation
33		. . Capacitive actuation
34		. . Pressure sensitive actuation
35		. With rotary dial
50		DIGITAL CODE TO DIGITAL CODE CONVERTERS
51		. Adaptive coding
52		. To or from particular bit symbol
53		. . Bit represented by pulse width
54		. . Bit represented by discrete frequency
55		. Substituting specified bit combinations for other prescribed bit combinations
56		. To or from multi-level codes
57		. . Binary to or from ternary
58		. To or from minimum d.c. level codes
59		. To or from run length limited codes
60		. To or from packed format
61		. Data rate conversion
62		. BCD (binary-coded-decimal) to or from decimal
63		. To or from bit count codes
64		. To or from number of pulses
65		. . To or from Huffman codes
66		. . To or from Morse code
67		. To or from variable length codes
68		. To or from NRZ (nonreturn-to-zero) codes
69		. . Return-to-zero to or from NRZ (nonreturn-to-zero) codes
70		. . To or from bi-phase level code (e.g., split phase code, Manchester code)
71		. . To or from bi-phase space or mark codes (e.g., double frequency code, FM code)
72		. . To or from delay modulation code (e.g., Miller code, three frequency code, MFM code)
73		. . To or from coded mark inversion
74		. . To or from double density code
75		. To or from nonlinear codes
76		. To or from differential codes
77		. . To or from delta modulation codes
78		. Programmable structure
79		. Tree structure
80		. To or from fibonacci codes
81		. To or from interleaved format
82		. To or from mixed code formats
83		. To or from mixed base codes
84		. . Binary to BCD (binary-coded decimal)
85		. . BCD (binary-coded decimal) to binary
86		. Generator runs until new code is generated
87		. Unnecessary data suppression
88		. Multiple conversions using same converter
89		. Reversible converters
90		. To or from alphanumeric code formats
91		. . To or from Baudot code
92		. . To or from Hollerith code
93		. Complementers
94		. With error detection or correction
95		. Byte length changed
96		. To or from constant distance codes
97		. . Gray to binary
98		. . Binary to Gray
99		. To or from display device codes
100		. Serial to parallel
101		. Parallel to serial
102		. To or from "N" out of "M" codes
103		. . "N" out of "M" to "X" out of "Y"
104		. Binary to decimal
105		. Decimal to binary
106		. Coding by table look-up techniques
107		. To or from code based on probability
108		REVERSIBLE ANALOG TO DIGITAL CONVERTERS
109		STOCHASTIC TECHNIQUES
110		ANALOG TO DIGITAL CONVERSION FOLLOWED BY DIGITAL TO ANALOG CONVERSION
111		PHASE OR TIME OF PHASE CHANGE
112		. Synchro or resolver signal
113		. . Coarse and fine
114		. . Control system
115		. . Converter compensation
116		. . Analog resolver or synchro signal to digital signal
117		. . Digital signal to analog resolver or synchro signal
118		CONVERTER COMPENSATION
119		. Temperature compensation
120		CONVERTER CALIBRATION OR TESTING
121		. Trimming control circuits
122		SAMPLE AND HOLD
123		. Having variable sampling rate
124		. Sampled and held input signal with linear return to datum
125		. Sampled and held input signal with nonlinear return to datum
126		ANALOG TO OR FROM DIGITAL CONVERSION
127		. Bipolar
128		. . Dual slope analog to digital converter
129		. . Plural slope analog to digital converter
130		. Difunction code as output
131		. Increasing converter resolution (e.g., dithering)
132		. Detecting analog signal peak
133		. With particular solid state devices (e.g., Gunn effect device, Josephson device, drift transistor, using solid state active devices as impedances) with other at longer intervals)
134		. . Integrated injection logic
135		. . Current mirror
136		. . Field effect transistor
137		. Using optical device, (e.g., fiber optics, cathode ray tubes)
138		. Nonlinear
139		. . Automatic control for increasing converter range (e.g., gain ranging, automatic gain control)
140		. . Linearization (e.g., nonlinear transfer characteristic compensates for nonlinear transducer)
141		. Multiplex
142		. Converter is part of control loop
143		. Differential encoder and/or decoder (e.g., delta modulation, differential pulse code modulation)
144		. Digital to analog conversion
145		. . Coarse and fine conversions
146		. . Serial conversion
147		. . Function generator
148		. . Tree structure
149		. . Using magnetic or cryogenic components
150		. . Using charge coupled devices or switched capacitances
151		. . Analog output represents a displacement or force
152		. . With intermediate conversion of digital value to time interval
153		. . Using weighted impedances
154		. . Using ladder network
155		. Analog to digital conversion
156		. . Coarse and fine conversions
157		. . Intermediate conversion to frequency or number of pulses
158		. . Analog input compared with static reference
159		. . . Parallel type
160		. . . . Including priority encoder
161		. . . Acting sequentially
162		. . . Serial conversions with change in signal
163		. . . Recirculating
164		. . . Single comparator and counter
165		. . . Single comparator and digital storage
166		. . Intermediate conversion to time interval
167		. . . Dual slope
168		. . . Plural slope
169		. . . Input signal compared with linear ramp
170		. . . Input signal compared with nonlinear ramp
171		. . Using magnetic or cryogenic components
172		. . Using charge transfer devices (e.g., charge coupled devices, charge transfer by switched capacitances)
173		CODE GENERATOR OR TRANSMITTER
174		. Plural transmitters
175		. With code display at transmitter
176		. Transmitter for remote control signal
177		. Producing different pulse frequencies
178		. With variable pulse spacing or grouping
179		. . Plural pulse shapes
180		. . Plural channels
181		. . Carrier frequency variation
182		. . With variable pulse length
183		. . Pulse presence or absence in equal length code
184		. Numerical pulse type
185		. . Multistage
186		. . With gaseous or space discharge device
187		. . Having counter or register
188		. . Serial pulse number actuation
189		. . Pulse gating
190		. . Mechanical switch feature
191		. With gaseous or space discharge device feature
192		. With rotary distributor
200		QUANTIZER
899		MISCELLANEOUS

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Last Modified: 6 October 2000