Charge redistribution A-law PCM decoder
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United States of America Patent
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Mar 26, 1985
Issued Date -
N/A
app pub date -
Dec 5, 1983
filing date -
Dec 5, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An integratable mu-law PCM decoder including only a single operational amplifier having a unit valued feedback capacitor C1, and second and third unit valued switched capacitors C2 and C3. Switch means cyclically connects C2 between ground and either ground or a reference voltage, and across C1 for providing an indication on C2 of the step offset in a prescribed segment; cyclically connects C3 between ground and the reference voltage and across C1 for stepping through segments below the prescribed segments; transfers all of the charge on C2 to C1 for the prescribed segment; and alternately connects opposite sides of C3 to ground and across C1 for segments above the prescribed segment for redistributing charge on the capacitors and producing an analog signal sample on C1. In an alternate embodiment for satisfying the A-law, all charge on C3 is transferred to C1 for only a first segment that is below the prescribed segment.
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