Circuitry and method for sampling audio data
AssigneeSeiko Epson Corporation
InventorsJohn Peter van Baarsen, Jiliang Song
Life of this patent
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Abstract
A method for sampling audio data is provided. In this method, the audio data is received and sampled at a first sampling rate using a first interpolation calculation. Thereafter, the audio data sampled at the first sampling rate is again sampled at a second sampling rate using a second interpolation calculation. After sampling, the second audio data sampled at the second sampling rate is outputted. Circuitries and systems for sampling audio data also are described.
Claims14
A method for sampling audio data, comprising method operations of:
- receiving the audio data, the audio data having a sampling rate that is less than 48 kilohertz;
- sampling the audio data at about 48 kilohertz, the audio data being sampled at about 48 kilohertz defining a first sampled audio data;
- sampling the first sampled audio data at about 44.1 kilohertz, the first sampled audio data being sampled at about 44.1 kilohertz defining a second sampled audio data;
- and
- outputting the second sampled audio data.
A system for sampling audio data, comprising:
- an audio decoder;
- a resampling circuit in communication with the audio decoder, the resampling circuit including,
- circuitry configured for up sampling the audio data at a first frequency and then down sampling the up sampled audio data at a second frequency;
- and
- a digital-to-analog converter in communication with the resampling circuit;
- and
- wherein the circuitry configured for sampling the audio data at the first frequency and the second frequency includes,
- a filter coefficient table configured to store impulse response values for band-limited interpolation;
- a multiplier in communication with the filter coefficient table;
- an adder in communication with the multiplier;
- and
- a register for temporarily storing a value being accumulated;
- and
- wherein the multiplier, the adder and the register are configured to perform linear interpolation.
A system for sampling audio data, comprising:
- an audio decoder;
- a resampling circuit in communication with the audio decoder, the resampling circuit including,
- circuitry configured for up sampling the audio data at a first frequency and then down sampling the up sampled audio data at a second frequency;
- and
- a digital-to-analog converter in communication with the resampling circuit;
- and
- wherein the first frequency is about 48 kilohertz and the second frequency is about 44.1 kilohertz.
A resampling circuit for sampling audio data, comprising:
- a multiplier accumulator configured to sample the audio data at a first stage at a first frequency and sample first stage output data at a second frequency, the first frequency being greater than the second frequency;
- a memory in communication with the multiplier accumulator;
- and
- selection circuitry in communication with the memory and the multiplier accumulator, the selection circuitry being configured to select the audio data sampled at the second frequency for output to a digital-to-analog converter.
Dependencies are inferred from the claim text.