Digital data converter

Details Digital data converter Digital data converter

1992-01-09

1992-10-13

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 26, 375 29, 375 30, 341 77, H04B 1404, H04B 1406

Patent

active

051557436

ABSTRACT:
A decoder for recovering an analog signal from its digital representation produced by an encoder employing adaptive-delta-modulation first decodes audio bit-stream (17) in the digital domain with digital delta demodulation (15), to a pulse-code-modulation (PCM) format digital signal. Post-processing (35), complementary to encoder processing is performed digitally on the PCM signal. The output from post-processor (35) is up-sampled, and using delta modulation, a noise shaped single-bit highly oversampled output is produced by converter (14). Applying the single-bit output to lowpass filter (11) re-constructs the decoded analog signal, which is audio output (12). By fully exploiting digital signal processing techniques, the decoder can be manufactured at low cost and exceed the performance of existing analog implementations.

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