(0)H03M:1/1:
IPC6
SECTION H - ELECTRICITY
CODING; DECODING OR CODE CONVERSION, IN GENERAL
H03M
2/2
<<   >>   H03M003/00 - H03M013/12  

3
/ 00 Conversion of analogue values to or from differential modulation [4]

3
/ 02 • Delta modulation, i.e. one-bit differential modulation [4]  

3
/ 04 • Differential modulation with several bits [4]  
 

 5
/ 00 Conversion of the form of the representation of individual digits [4]

Note
 

In groups H 03 M 5/02 to H 03 M 5/22, in the absence of an indication to the contrary, classification is made in the last appropriate place. [4]

5
/ 02 • Conversion to or from representation by pulses [4]  

5
/ 04 • • the pulses having two levels [4]  

5
/ 06 • • • Code representation, e.g. transition, for a given bit cell depending only on the information in that bit cell [4]  

5
/ 08 • • • • Code representation by pulse width [4]  

5
/ 10 • • • • Code representation by pulse frequency [4]  

5
/ 12 • • • • Biphase level code, e.g. split phase code, Manchester code; Biphase space or mark code, e.g. double frequency code [4]  

5
/ 14 • • • Code representation, e.g. transition, for a given bit cell depending on the information in one or more adjacent bit cells, e.g. delay modulation code, double density code [4]  

5
/ 16 • • the pulses having three levels [4]  

5
/ 18 • • • two levels being symmetrical with respect to the third level, i.e. balanced bipolar ternary code [4]  

5
/ 20 • • the pulses having more than three levels [4]  

5
/ 22 • Conversion to or from representation by sinusoidal signals [4]  
 

 7
/ 00 Conversion of a code where information is represented by a given sequence or number of digits to a code where the same information is represented by a different sequence or number of digits [4]

Note
 

In groups H 03 M 7/02 to H 03 M 7/50, in the absence of an indication to the contrary, classification is made in the last appropriate place. [4]

7
/ 02 • Conversion to or from weighted codes, i.e. the weight given to a digit depending on the position of the digit within the block or code word [4]  

7
/ 04 • • the radix thereof being two [4]  

7
/ 06 • • the radix thereof being a positive integer different from two [4]  

7
/ 08 • • • the radix being ten, i.e. pure decimal code [4]  

7
/ 10 • • the radix thereof being negative [4]  

7
/ 12 • • having two radices, e.g. binary-coded-decimal code [4]  

7
/ 14 • Conversion to or from non-weighted codes [4]  

7
/ 16 • • Conversion to or from unit-distance codes, e.g. Gray code, reflected binary code [4]  

7
/ 18 • • Conversion to or from residue codes [4]  

7
/ 20 • • Conversion to or from n-out-of-m codes [4]  

7
/ 22 • • • to or from one-out-of-m codes [4]  

7
/ 24 • • Conversion to or from floating-point codes [4]  

7
/ 26 • Conversion to or from stochastic codes [4]  

7
/ 28 • Programmable structures, i.e. where the code converter contains apparatus which is operator-changeable to modify the conversion process [4]  

7
/ 30 • Compression (for image communication H 04 N); Expansion; Suppression of unnecessary data, e.g. redundancy reduction [4]  

7
/ 32 • • Conversion to or from delta modulation, i.e. one-bit differential modulation [4]  

7
/ 34 • • • adaptive [4]  

7
/ 36 • • Conversion to or from differential modulation with several bits, i.e. the difference between successive samples being coded by more than one bit [4]  

7
/ 38 • • • adaptive [4]  

7
/ 40 • • Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code [4]  

7
/ 42 • • • using table look-up for the coding or decoding process, e.g. using read-only memory [4]  

7
/ 44 • • • Suppression of irrelevant zeroes [4]  

7
/ 46 • • Conversion to or from run-length codes, i.e. by representing the number of consecutive digits, or groups of digits, of the same kind by a code word and a digit indicative of that kind [4]  

7
/ 48 • • • alternating with other codes during the code conversion process, e.g. run-length coding being performed only as long as sufficiently long runs of digits of the same kind are present [4]  

7
/ 50 • • Conversion to or from non-linear codes, e.g. companding [4]  
 

 9
/ 00 Parallel/series conversion or vice versa (digital stores in which the information is moved stepwise G 11 C 19/00) [4]
 

 11
/ 00 Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys (keyboard switch arrangements, structural association of coders and keyboards H 01 H 13/70, H 03 K 17/94) [4]

11
/ 02 • Details [5]  

11
/ 04 • • Coding of multifunction keys [5]  

11
/ 06 • • • by operating the multifunction key itself in different ways [5]  

11
/ 08 • • • • by operating selected combinations of multifunction keys [5]  

11
/ 10 • • • • by methods based on duration or pressure detection of keystrokes [5]  

11
/ 12 • • • • by operating a key a selected number of consecutive times whereafter a separate enter key is used which marks the end of the series [5]  

11
/ 14 • • • by using additional keys, e.g. shift keys, which determine the function performed by the multifunction key [5]  

11
/ 16 • • • • wherein the shift keys are operated after the operation of the multifunction keys [5]  

11
/ 18 • • • • wherein the shift keys are operated before the operation of the multifunction keys [5]  

11
/ 20 • Dynamic coding, i.e. by key scanning (H 03 M 11/26 takes precedence) [5]  

11
/ 22 • Static coding (H 03 M 11/26 takes precedence) [5]  

11
/ 24 • • using analogue means [5]  

11
/ 26 • using opto-electronic means [5]  
 

 13
/ 00 Coding, decoding or code conversion, for error detection or error correction (error detection or error correction for analogue/digital, digital/analogue or code conversion H 03 M 1/00 to H 03 M 11/00; specially adapted for digital computers G 06 F 11/08, for information storage based on relative movement between record carrier and transducer G 11 B, e.g. G 11 B 20/18, for static stores G 11 C) [4]

13
/ 02 • using n-out-of-m codes [4]  

13
/ 12 • using convolutional codes [4]  

13
/ 22 • using interleaving techniques [4]  

 

 

 
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