An audio device (200) includes a first and second ICs (210) and (250) and a substrate (205). The first IC includes a sigma-
delta, A / D converter (218) operable to convert an
analog signal (234) into a pulse density modulated
signal (236). A pulse density width modulator
encoder (222) is operable to
encode the PDM
signal into a PDWM
signal (244). 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 (250) includes a means (254) to receive the PDWM signal, an
edge detector (304) operable to detect the leading pulse edges of the PDWM signal, a time-averaging circuit (308) operable to calculate each
pulse period from the leading pulse edges and to generate a sample pulse (120) at near the midpoint of each
pulse period, and a latch (312) operable to
sample and hold the PDWM signal at the sample pulse to decode a PDM signal (278). The substrate is operable to support the first and second ICs and to conduct the PDWM signal between the first and second ICs.