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IPC6

SECTION H - ELECTRICITY

CODING; DECODING OR CODE CONVERSION, IN GENERAL

H03M

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H03M001/00 - H03M001/88

H 03 M

CODING; DECODING OR CODE CONVERSION, IN GENERAL (using fluidic means F 15 C 4/00; optical analogue/digital converters G 02 F 7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G 01 D, G 01 R, G 06 F, G 06 T, G 09 G, G 10 L, G 11 B, G 11 C, H 04 L, H 04 M, H 04 N ; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G 09 C) [4]

Analogue/digital conversion; Digital/analogue conversion (conversion of analogue values to or from differential modulation H 03 M 3/00) [4]

Reversible analogue/digital converters [4]

using stochastic techniques [4]

Continuously compensating for, or preventing, undesired influence of physical parameters (periodically H 03 M 1/10) [4]

Calibration or testing [4]

Analogue/digital converters (H 03 M 1/02 to H 03 M 1/10 take precedence) [4]

Conversion in steps with each step involving the same or a different conversion means and delivering more than one bit [4]

with scale factor modification, i.e. by changing the amplification between the steps [4]

Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging [4]

Increasing resolution using an n bit system to obtain n + m bits, e.g. by dithering [4]

pattern-reading type [4]

using relatively movable reader and disc or strip [4,6]

with weighted coding, i.e. the weight given to a digit depends on the position of the digit within the block or code word, e.g. there is a given radix and the weights are powers of this radix [4]

with non-weighted coding [4]

incremental [4]

using cathode-ray tubes [4]

Analogue value compared with reference values (H 03 M 1/48 takes precedence) [4]

simultaneously only, i.e. parallel type [4]

sequentially only, e.g. successive approximation type (converting more than one bit per step H 03 M 1/14) [4]

recirculation type [4]

Sequential comparisons in series-connected stages with no change in value of analogue signal [4]

Sequential comparisons in series-connected stages with change in value of analogue signal [4]

with digital/analogue converter for supplying reference values to converter [4]

Servo-type converters [4]

with intermediate conversion to time interval (H 03 M 1/64 takes precedence) [4]

Input signal integrated with linear return to datum [4]

Input signal sampled and held with linear return to datum [4]

Input signal compared with linear ramp [4]

Non-linear conversion [4]

with intermediate conversion to frequency of pulses [4]

Non-linear conversion [4]

with intermediate conversion to phase of sinusoidal signals [4]

Digital/analogue converters (H 03 M 1/02 to H 03 M 1/10 take precedence) [4]

with conversions of different sensitivity, i.e. one conversion relating to the more significant digital bits and another conversion to the less significant bits [4]

Automatic control for modifying converter range [4]

Sequential conversion in series-connected stages (H 03 M 1/68 takes precedence) [4]

Simultaneous conversion [4]

using switching tree [4]

using ladder network [4]

using weighted impedances (H 03 M 1/76 takes precedence) [4]

with intermediate conversion to time interval [4]

Non-linear conversion [4]

with intermediate conversion to frequency of pulses [4]

Non-linear conversion [4]

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