Digital-to-analog converter and PCM encoder using the converter

Details Digital-to-analog converter and PCM encoder using the converter Digital-to-analog converter and PCM encoder using the converter

1985-01-17

1986-12-23

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, H03M 146

Patent

active

RE0323136

ABSTRACT:
A PCM encoder for converting a voice signal into a eight-bit code by approximating the .mu.-low characteristic where .mu.=255 with 15 segments comprises a capacitor array circuit including eight capacitors for determining lowermost voltages of the segments, a resistor string circuit for producing step voltage in each of the segments, a comparator circuit for comparing the output voltage of the capacitor array circuit with a reference voltage, and a successive approximation register circuit for controlling switch groups provided in the capacitor array circuit and the resistor string circuit. The resistor string circuit is provided with taps for deriving voltages corresponding to (2n-1)/33 (where n=1-16) of a voltage applied across the resistor string. A PCM encoder which conforms to the .mu.-low with high fidelity and is capable of quantizing mid-tread at the first segment is disclosed.

REFERENCES:
patent: 3812478 (1974-05-01), Tomisawa
patent: 4195282 (1980-03-01), Cameron
patent: 4198622 (1980-04-01), Connolly
patent: 4200863 (1980-04-01), Hodges
Tsividis et al. "IEEE International Solid-State Circuits Conference" Feb. 18, 1976, p. 24-15.
Caves "IEEE Journal of Solid-State Circuits", vol. SC-14 No. 1, Feb. 1979, pp. 65-73.
Haque "IEEE Journal of Solid-State Circuits" vol. SC-14 No. 6, Dec. 1979, pp. 961-968.
Huggins "IEEE International Solid-State Circuits Conference" Feb. 16, 1978, pp. 178-179.

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