PCM telecommunication system with merger of two bit streams alon

Details PCM telecommunication system with merger of two bit streams alon PCM telecommunication system with merger of two bit streams alon

1976-04-23

1977-09-20

Stewart, David L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

179 15A, 340345DD, H04J 304

Patent

active

040499170

ABSTRACT:
A transmitting terminal, communicating via a PCM link with a remote receiving terminal, processes two simultaneously arriving bit streams consisting of recurrent frames of 32 time slots, 29 of these time slots containing 8-bit code words which represent voice samples from as many PCM channels. The two arriving bit streams are transcoded by an ADPCM (adaptive differential pulse-code modulation) technique to convert the 8-bit words into substantially equivalent 4-bit words which are then combined, in interleaved relationship, into a single bit stream sent to the receiving terminal, each frame of this composite bit stream having 29 of its 32 time slots occupied by two four-bit words respectively taken from the original bit streams. At the receiving terminal a complementary procedure is followed to separate the two groups of 4-bit code words from each other and to reconvert each of them into an 8-bit word, with substantial reconstitution of the original bit streams.

REFERENCES:
patent: 3707680 (1972-12-01), Gabbard
patent: 3927268 (1975-12-01), Sciulli

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