Pulse or digital communications – Pulse code modulation – Differential
Patent
1993-09-14
1998-03-10
Chin, Stephen
Pulse or digital communications
Pulse code modulation
Differential
375249, 341126, 341143, H04B 1406
Patent
active
057270236
ABSTRACT:
A speech encoder converts analog speech signals into a stream of binary coded speech samples. A circuit for performing analog to digital conversion compares an input speech signal with a signal from a digital integrator. Based on the comparison a series of decisions are registered which indicate a step sign of the input signal. A syllabic filter generates a step magnitude according to the registered decisions. The step sign and step magnitude are combined providing a sign/magnitude representation of the input signal. When the sign/magnitude representation is integrated digitally in a decimation filter a digital representation of the analog signal is formed. A speech decoder, the antithesis of the encoder, converts binary coded speech samples into an analog waveform in a manner opposite to the A/D conversion method.
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Chin Stephen
Ericsson Inc.
Webster Bryan
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