Back to results
US 2003/0151535 A1Published application
Circuits, systems and methods for volume control in 1-bit digital audio systems
AssigneeCirrus Logic, Inc.
InventorsJohn Laurence Melanson, Jason Powell Rhode
Life of this patent
Estimating the term…
Abstract
A method of amplitude control in a 1-bit digital system includes the step of scaling the stream of 1-bit data by a scaling factor corresponding to a selected output amplitude. The scaled data is modulated and the resulting modulated, scaled data is converted from digital to analog form.
Claims20
A method of amplitude control in a 1-bit digital system comprising the steps of:
- scaling a stream of 1-bit data by a scaling factor corresponding to a selected output amplitude;
- modulating the scaled data to generate multiple-bit recoded data;
- and
- converting the multiple-bit recoded scaled data from digital to analog form.
1 more element
A digital to analog conversion subsystem for converting the 1-bit audio data stream into analog audio comprising:
- a scaler for digitally scaling the 1-bit digital audio data to generate scaled digital data, the scaler applying a scaling factor selected to set an audio output volume level;
- a modulator for modulating the scaled digital data and outputting multiple-bit recoded scaled data;
- and
- a multiple-bit digital to analog converter for converting the multiple-bit recoded scaled digital data analog audio data.
1 more element
An audio system comprising:
- a source of a 1-bit audio data stream;
- a digital to analog conversion subsystem for converting the 1-bit audio data stream into analog form operable to:
- scale the stream of 1-bit data by a scaling factor corresponding to a selected output amplitude;
- modulate the scaled data in a modulator outputing multiple-bit requantized scaled data;
- and
- convert the multiple-bit requantized scaled data from digital to analog form;
- and
- circuitry for converting the analog data into audible tones.
5 more elements
Dependencies are inferred from the claim text.