Companding analog to digital converter

Details Companding analog to digital converter Companding analog to digital converter

1980-09-22

1982-12-28

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

324115, H03K 1302

Patent

active

043664695

ABSTRACT:
A companding analog to digital converter for converting an analog signal into a variable length multi-bit binary word, the number of said bits being a function of the magnitude of the analog signal being converted relative to the high end of the range of magnitudes capable of being converted. The analog signal is temporarily stored and is attenuated by a predetermined amount. The attenuated signal is converted into a multi-bit digital word. A group of the most significant bits of said digital word are examined to alter the attenuation of the stored analog signal dependent upon its magnitude relative to the full scale. The attenuated analog signal is again converted into a multi-bit digital word which is temporarily stored. The group of binary bits initially stored together with results of the second conversion operation are combined to develop a multi-bit digital word whose bit length is a function of the magnitude of the stored analog signal relative to scale. Multiplexer means are utilized to transfer stored bits to an output line in order to provide an output word of uniform digital length regardless of the magnitude of the converted analog signal.

REFERENCES:
patent: 3187323 (1965-06-01), Flood et al.
patent: 3646586 (1972-02-01), Kurz
patent: 4114094 (1978-09-01), Cook
patent: 4129864 (1978-12-01), Carpenter
patent: 4250447 (1981-02-01), Lode
Aldridge "Electron" No. 118, Jun. 9, 1977, pp. 52-54.

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