Device and method for the transmission and reception of high fidelity audio using a single wire

Abstract

An audio device () includes a first and second ICs () and () and a substrate (). The first IC includes a sigma-delta, A/D converter () operable to convert an analog signal () into a pulse density modulated signal (). A pulse density width modulator encoder () is operable to encode the PDM signal into a PDWM signal (). The PDWM has short and long pulse widths defining first and second bit levels. The leading edges of each pulse bounds each pulse period. The second IC () includes a means () to receive the PDWM signal, an edge detector () operable to detect the leading pulse edges of the PDWM signal, a time-averaging circuit () operable to calculate each pulse period from the leading pulse edges and to generate a sample pulse () at near the midpoint of each pulse period, and a latch () operable to sample and hold the PDWM signal at the sample pulse to decode a PDM signal (). The substrate is operable to support the first and second ICs and to conduct the PDWM signal between the first and second ICs.