Pulse code modulation translators

Pulse or digital communications – Repeaters – Testing

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375 30, 375122, 332 11D, H03M 730

Patent

active

046100180

ABSTRACT:
Pulse Code Modulation (PCM) translator for translating a PCM input word into a PCM output word, one of said words being in accordance with a compressed code and the other with a linear code, characterized in that it is adapted to convert the binary bits of the input word into those of the output word in accordance with either the A-law or the mu-law. The circuit forms part of a telephone line circuit (LC) connected between a telephone line (LI) and a digital switching network (SNW) and comprising the cascade connection of a subscriber line interface (SLIC) able to perform line control and supervision, a digital signal processor (DSP) mainly adapted to execute analog-to-digital and digital-to-analog conversion operations, the above transcoder circuit and a dual processor terminal controller (DPTC) which deals with the general control of the line circuit. The DSP only processes linear PCM signals, whereas the DPTC solely operates on companded PCM signals.

REFERENCES:
patent: 3705359 (1972-12-01), Kappes
patent: 3937897 (1976-02-01), Song
patent: 4311988 (1982-01-01), Kelley et al.
patent: 4370632 (1983-01-01), Allgood et al.
Owen, PCM and Digital Transmission Systems, McGraw-Hill, 1982, pp. 61-68.

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