Circuits, systems and methods for processing data in a one-bit format

A single chip digital to analog conversion subsystem comprising:

• an interface for receiving digital audio data in a 1-bit format;
• and
• a finite impulse response filter including a plurality of delay elements for delaying the 1-bit audio data by a preselected amount and a switched-capacitor DAC/filter for summing data from a plurality of outputs of said delay elements selected to effectuate a set of filter coefficients to generate a filtered analog signal, said DAC/filter having a a pole at a preselected frequency to minimize near-out-of-band noise.

A digital audio processing system comprising:

• a source of a stream of 1-bit format digital audio data;
• and
• a converter for converting the 1-bit format digital audio data received from said source of audio data into an analog format comprising a finite impulse response filter operating in response to a preselected set of filter coefficients for filtering said stream of data in the 1-bit format and outputting a filtered analog data stream in response.

A method for processing 1-bit format digital audio data using a multibit DAC, the method comprising the steps of:

• passing the stream of digital data through a plurality of delay elements;
• and
• summing selected output in accordance with a set of filter coefficients of the delay elements using a switched capacitor multibit DAC and generating audio data in an analog format in response.