Digital companding circuit

Details Digital companding circuit Digital companding circuit

H - Electricity

03

M

354/103

H03M 7/30 (2006.01) G06F 7/556 (2006.01) H03M 7/50 (2006.01)

Patent

CA 1240063

ABSTRACT A circuit for companding digital signals, incorporating a bidirectional barrel shifter in the form of an array of transmission gate cells for shifting step bits of a compressed PCM signal a predetermined number of locations to the left in response to the magnitude of chord bits thereof. The shifted bits are applied to a linear digital signal bus in the form of an expanded linear representation of the PCM signal. Linear digital signals appearing on the linear bus are compressed via shifting to the right through the barrel shifter and are applied therefrom to a PCM signal bus. The companding circuit is inexpensive, can accommodate both A-law and µ-law PCM protocols, is fully static and operates at high speed.

502658

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