PCM and PAM Conversion circuit including signal level variation

Details PCM and PAM Conversion circuit including signal level variation PCM and PAM Conversion circuit including signal level variation

1979-03-09

1983-01-04

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, 340347DA, 340347M, 328168, 375 98, H03K 1302

Patent

active

043674569

ABSTRACT:
A conversion circuit for use with digital telephone switching equipment for converting pulse amplitude modulation (PAM) signals into pulse code modulated (PCM) signals and for converting PCM signals into PAM signals. When these conversions are done it is desirable to adjust the magnitude of the signals involved to take into account the differing losses in the associated analogue circuitry. The present invention employs digital pads, in the digital portion of the conversion circuit and controlled by a storage register, in order to introduce variations in the signal levels.

REFERENCES:
patent: 3504286 (1970-03-01), Jacobaeus
patent: 3656152 (1972-04-01), Gundersen
patent: 3790910 (1974-02-01), McCormack
patent: 3877028 (1975-04-01), Thomas
patent: 3883864 (1975-05-01), Thomas
patent: 3900844 (1975-08-01), Wald
patent: 3906488 (1975-09-01), Suarez-Gartner
patent: 3984829 (1976-10-01), Zwack
patent: 4016557 (1977-04-01), Zitelli et al.
patent: 4021652 (1977-05-01), Munter
patent: 4056820 (1977-11-01), Hofer
patent: 4118773 (1978-10-01), Raguin et al.
patent: 4121055 (1978-10-01), Doherty
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I--64 & 65.
Intel 2316E 16,384 Bit Static ROM publication, Intel Corp., 7/1977 3 sheets.

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