NIC Processor using variable precision block quantization

Pulse or digital communications – Repeaters – Testing

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375 14, G10L 100

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active

043862373

ABSTRACT:
A nearly instantaneous companding processor uses variable precision block quantization for reducing the digital transmission rate of speech signals while at the same time maintaining a high quality signal in a digital communication system. The variable number of bits which are used to encode each sample is controlled as a function of the maximum sample magnitude in a block of N samples. This technique takes advantage of the amplitude probability density function of a speech signal to thereby reduce the quantizing noise without increasing the transmission rate.

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Croll et al., "Nearly Instantaneous Digital Compander . . . ", Electronics Letters, Jul. 12, 1973, pp. 298-300.

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