Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1982-03-29
1985-07-09
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
375 27, H03K 1322
Patent
active
045285519
ABSTRACT:
A digital to analog converter is employed in the digital line circuit of a telephone system and operates to convert a digital signal indicative of an analog speech signal back into a replica of the analog signal. The converter operates with an interpolated input digital signal to detect by means of a sign bit, the characteristic of an input digital word as being indicative of a positive or negative level. An error correcting signal is provided by the converter which is added to the next digital word to provide a compensated word having a sign bit determined by the remainder and the sign bit of the previous digital word. This word is then processed in sequence to produce an output pulse stream from the sign detector indicative of successive positive or negative values as defined by the input digital words, each of which are modified according to the error correcting signal.
REFERENCES:
patent: 3793513 (1974-02-01), Kaneko
patent: 3937897 (1976-02-01), Song
patent: 4006475 (1977-02-01), Candy
patent: 4079373 (1978-03-01), Brown
patent: 4109110 (1978-08-01), Gingell
patent: 4209773 (1980-06-01), Everard
Agrawal Bhagwati
Shenol Kishan
International Telephone and Telegraph Corporation
Miller Charles D.
Morris Jeffrey P.
O'Halloran John T.
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