Patent ID: 6542612
Filing Date: 2003-04-01
Classification: H03G,H04B

Abstract:
A digital companding amplifier, comprising:(a) audio compression circuitry to compress an analog audio input signal, said audio compression circuitry including means for outputting digital audio data and digital compression data associated with said digital audio data; and (b) audio expansion circuitry to convert said digital compressed audio data to an analog audio signal and to expand said analog audio signal as a function of said digital compression data; (c) wherein said audio compression circuitry comprises: (i) voltage controlled amplifier means for receiving an analog audio input signal, receiving an analog voltage control signal, and outputting a compressed analog audio signal; (ii) first analog to digital converter means for converting said compressed analog audio signal to compressed digital audio data; (iii) second analog to digital converter means for converting said analog audio input signal to digital audio data; (iv) control processor means for receiving said digital audio data from said second analog to digital converter means, outputting digital voltage control data, and outputting digital compression data; (v) first digital to analog converter means for converting said digital voltage control data from said control processor means to an analog voltage control signal and outputting said analog voltage control signal to said voltage controlled amplifier means; and (vi) data framer means for receiving said compressed digital audio data from said first analog to digital converter means and said digital compression data from said control processor means and outputting a framed data stream.