| ReturnTo Theme-Group-Choice | Onelevelup |
| 5J064 | COMPRESSION, EXPANSION, CODE CONVERSION, AND DECODERS | |
| H03M3/00 -9/00,300 | ||
| H03M3/00-3/04;7/00;7/30-7/50 | AA | AA00 PURPOSE |
AA01 | AA02 | AA03 | AA04 | AA05 | AA06 | ||||
| . Improved accuracy | . Improved efficiency | . Improved speed | . Miniaturization or integration | . Time sharing and multiplexing | . Hardware testing and hardware monitoring | |||||||
| H03M3/00-3/04;7/30-7/50 | BA | BA00 COMPRESSION AND EXPANSION METHODS |
BA01 | BA02 | BA03 | BA04 | BA05 | BA06 | BA07 | BA08 | BA09 | BA10 |
| . Differential modulation and demodulation | . . Delta modulation (DM or delta-M) | . . Delta sigma modulation(sigma-M) | . . Differential pulse code modulation (DPCM) | . . Adaptive differential pulse code modulation (ADPCM) | . . Over-sampling modulation | . . Variable slope modulation | . Run-length coding | . Variable-length coding (e.g., Huffman coding) | . Mathematical codes | |||
| BA11 | BA12 | BA13 | BA14 | BA15 | BA16 | BA17 | BA18 | |||||
| . Character compression (e.g., word processing) | . Non-linear coding(e.g., mu-law and A-law) | . Vector quantization | . Tree coding | . Matrix to array conversion | . . Orthogonal conversion (e.g., Hadamard conversion) | . . Interleaving | . Special codes | |||||
| BB | BB00 MAIN FUNCTIONAL FEATURES |
BB01 | BB02 | BB03 | BB04 | BB05 | BB06 | BB07 | BB08 | BB09 | BB10 | |
| . Differential input and output units | . Main loops and feedback loops | . Calculation of predicted values | . Interpolation | . Code length or run-length calculation | . . Mathematical operations | . Eliminating noise | . Detecting or correcting errors | . Synchronizing | . Speed control | |||
| BB11 | BB12 | BB13 | BB14 | |||||||||
| . Control of direct-current (DC) components | . Gain control (e.g., adaptive control) | . Code conversion | . Elimination of distortion | |||||||||
| BC | BC00 DETAILED (CIRCUIT) STRUCTURES |
BC01 | BC02 | BC03 | BC04 | BC05 | BC06 | BC07 | BC08 | BC09 | BC10 | |
| . Memories | . Encoders or decoders | . Logical operations | . Registers | . Counters | . Analog to digital conversion | . Digital to analog conversion | . Addition and subtraction | . Multiplication and division | . Differentiating and integration | |||
| BC11 | BC12 | BC13 | BC14 | BC15 | BC16 | BC17 | BC18 | BC19 | BC20 | |||
| . Filters | . . Digital filters | . Switched capacitors | . Comparison or judgments | . Samplers | . Quantizers | . Limiters, clamps or normalization | . Band control | . Amplifiers or attenuators | . Majority decisions | |||
| BC21 | BC22 | BC23 | BC24 | BC25 | BC26 | BC27 | BC28 | BC29 | BC30 | |||
| . Averaging or smoothing | . Control of threshold values or multiple values | . Bit manipulation (e.g., addition, deletion or inversion) | . Operation timing | . Selection (e.g., multiplexers) | . Adaptive calculations | . . Correlation or histories | . . Probability or frequency | . Combination of software and hardware | . Input and output correction | |||
| BD | BD00 DATA PROCESSING AREAS |
BD01 | BD02 | BD03 | BD04 | BD05 | BD06 | BD07 | ||||
| . Unspecified areas | . Communications or transmission | . Recording or reproducing (e.g., optical or magnetic variants) | . Computers (e.g., microprocessors) | . Word processors | . Fax machines | . Printing (e.g., printers) | ||||||
| H03M7/00 | CA | CA00 TYPES OF DECODERS |
CA01 | CA02 | CA03 | CA04 | CA05 | CA06 | CA07 | |||
| . Address decoders | . Code conversion or generation | . . Selection codes (e.g., multiplexers) | . . Numerical value conversion (e.g., decimal or grayscale values) | . . Decoders for displays | . Priority decoders | . Programmable logic arrays (PLA) | ||||||
| CB | CB00 STRUCTURES OF DECODER CIRCUITS |
CB01 | CB02 | CB03 | CB04 | CB05 | CB06 | CB07 | CB08 | CB09 | CB10 | |
| . Mechanical switches (e.g., relays) | . Optical switches (e.g., photocouplers) | . Electronic switches | . . Resistors | . . Diodes | . . Bipolar switches (e.g., transistor-transistor logic [TTL] or integrated injection logic [I2L]) | . . Field-effect transistors (FET) (e.g., complementary metal oxide semiconductors [CMOS]) | . . Constant current sources | . Magnetic switches | . . Parametrons | |||
| CB11 | CB12 | CB13 | CB14 | |||||||||
| . . Superconductive switches | . Memories (e.g., read-only memories [ROM] or random access memories [RAM]) | . System constructions | . . Combination of software and hardware | |||||||||
| CC | CC00 PERIPHERAL CIRCUITRY FOR DECODERS |
CC01 | CC02 | CC03 | CC04 | CC05 | CC06 | CC07 | CC08 | CC09 | ||
| . Counters | . Registers | . Flip-flops | . Input and output circuits | . . Interfaces | . . Sense amplifiers | . Operating control (e.g., microprocessors) | . Display | . Comparison, detection, or judgment |