| 704 / | HD | DATA PROCESSING: SPEECH SIGNAL PROCESSING, LINGUISTICS, LANGUAGE TRANSLATION, AND AUDIO COMPRESSION/DECOMPRESSION |
| 200 | DF | SPEECH SIGNAL PROCESSING {4} |
| 201 | DF | .~ For storage or transmission {12} |
| 226 | ![]() | .~.~ Noise {2} |
| 227 | DF | .~.~.~> Pretransmission |
| 228 | DF | .~.~.~> Post-transmission |