Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1980-09-10
1983-01-18
Miller, C. D.
Communications: electrical
Audible indication
Percussion-type sound producer
340347AD, H03K 1302
Patent
active
043694330
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: 4200863 (1980-04-01), Hodges
Huggins, "IEEE International Solid-State Circuits Conference", Feb. 16, 1978, pp. 178-179.
Haque, "IEEE Journal of Solid-State Circuits", vol. SC-14, No. 6, Dec. 1979, pp. 961-968.
Caves, "IEEE Journal of Solid-State Circuits", vol. SC-14, No. 1, Feb. 1979, pp. 65-73.
Hitachi , Ltd.
Miller C. D.
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