Digital code translator

Details Digital code translator Digital code translator

1982-08-31

1985-10-01

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

375 30, H04L 300

Patent

active

045449163

ABSTRACT:
The most significant bits of each input word of a linear PCM signal address a read-only memory (ROM). Stored at each ROM address is a table of instruction words, one instruction word for each bit in the output word. The instruction words direct a switch to select each bit for the output word from a choice of 1, 0, or an input bit PCM compression according to a predetermined characteristic is implemented by instruction words which direct selection of the proper chord bits from 1 or 0 and the proper step bits from the input bits. A different compression characteristic may be implemented by a different set of stored instruction words. The instruction words also command selective bit inversion and selective inclusion of the bit in a parity check. Implementation of the translator with commercially available hardware is described.

REFERENCES:
patent: 3789392 (1974-01-01), Candiani
patent: 3798635 (1974-03-01), Candiani
patent: 3945002 (1976-03-01), Duttweiler et al.
patent: 4037226 (1977-07-01), Betts et al.
patent: 4040049 (1977-08-01), Messerschmitt
patent: 4191858 (1980-03-01), Araseki
Members of the Technical Staff, Bell Telephone Laboratories, Inc., Transmission Systems for Communications, 12/1971, pp. 580-583.

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