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

A method for decoding a pulse density modulated signal from a pulse density width modulated signal, the method comprising:

• receiving a pulse density width modulated signal wherein short and long pulse widths define first and second bit levels and wherein a leading edge of each pulse bounds each pulse period;
• detecting the leading pulse edges of the pulse density width modulated signal;
• calculating the pulse period from the leading pulse edges;
• generating a sample pulse at near the midpoint of each pulse period;
• and
• sampling and holding the pulse density width modulated signal at the sample pulse to decode a pulse density modulated signal.

An device enabled for receiving an encoded analog signal, the device comprising:

• a means to receive a pulse density width modulated signal wherein short and long pulse widths define first and second bit levels and wherein a leading edge of each pulse bounds each pulse period;
• an edge detector operable to detect the leading pulse edges of the pulse density width modulated 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 pulse density width modulated signal at the sample pulse to decode a pulse density modulated signal.

An audio device comprising:

• a first integrated circuit comprising:
• a sigma-delta, A/D converter operable to convert an analog signal into a pulse density modulated signal;
• and
• a pulse density width modulator operable to encode the pulse density modulated signal into a pulse density width modulated signal wherein short and long pulse widths define first and second bit levels and wherein a leading edge of each pulse bounds each pulse period;
• a second integrated circuit comprising:
• a means to receive the pulse density width modulated signal;
• an edge detector operable to detect the leading pulse edges of the pulse density width modulated 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 pulse density width modulated signal at the sample pulse to decode a pulse density modulated signal;
• and
• a substrate operable to support the first and second integrated circuits and to conduct the pulse density width modulated signal between the first and second integrated circuits.