Signal processing apparatus, signal processing method, and program
AssigneeSony Corporation
InventorTakao Fukui
Life of this patent
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Abstract
The present technology relates to a signal processing apparatus, a signal processing method, and a program that permit switching between a plurality of DSD signals having different sampling frequencies using a simple configuration. An acquisition section acquires a digital audio signal having a given sampling frequency selected from among the plurality of digital audio signals acquired by delta-sigma modulating an audio signal at a plurality of sampling frequencies. An interpolation section subjects the acquired digital audio signal to a pre-interpolation process when the sampling frequency of the acquired digital audio signal is lower than an operating clock of a delta-sigma demodulator. The present technology is applicable, for example, to a signal processing apparatus.
Claims13
A signal processing apparatus comprising:
- circuitry configured to function as:
- an acquisition section configured to acquire a digital audio signal, having a given sampling frequency, selected from among a plurality of digital audio signals acquired by delta-sigma modulating an audio signal at a plurality of sampling frequencies, wherein the digital audio signal is acquired in compliance with a dynamic adaptive streaming standard;
- and
- an interpolation section configured to:
- determine whether the sampling frequency of the acquired digital audio signal is lower than a clock frequency of an operating clock of a delta-sigma demodulator, and
- in response to determining that the sampling frequency of the acquired digital audio signal is lower than the clock frequency of the operating clock of the delta-sigma demodulator, subject the acquired digital audio signal to a pre-interpolation process before demodulation of the acquired digital audio signal, and
- in response to determining that the sampling frequency of the acquired digital audio signal is not lower than the clock frequency of the operating clock of the delta-sigma demodulator, output the acquired digital audio signal for demodulation,
- wherein the delta-sigma demodulator has a sampling frequency having a “power-of-two” relationship with a basic frequency, and
- wherein the basic frequency comprises a compact disc sampling frequency.
A signal processing method comprising, by a signal processing apparatus, the steps of:
- acquiring a digital audio signal, having a given sampling frequency, selected from among a plurality of digital audio signals acquired by delta-sigma modulating an audio signal at a plurality of sampling frequencies, wherein the digital audio signal is acquired in compliance with a dynamic adaptive streaming standard;
- determining whether the sampling frequency of the acquired digital audio signal is lower than a clock frequency of an operating clock of a delta-sigma demodulator;
- in response to determining that the sampling frequency of the acquired digital audio signal is lower than the clock frequency of the operating clock of the delta-sigma demodulator, subjecting the acquired digital audio signal to a pre-interpolation process before demodulation of the acquired digital audio signal;
- and
- in response to determining that the sampling frequency of the acquired digital audio signal is not lower than the clock frequency of the operating clock of the delta-sigma demodulator, outputting the acquired digital audio signal for demodulation,
- wherein the delta-sigma demodulator has a sampling frequency having a “power-of-two” relationship with a basic frequency, and
- wherein the basic frequency comprises a compact disc sampling frequency.
At least one non-transitory computer-readable storage medium encoded with executable instructions that, when executed by at least one processor, cause the at least one processor to perform a method comprising:
- acquiring a digital audio signal having a given sampling frequency selected from among a plurality of digital audio signals acquired by delta-sigma modulating an audio signal at a plurality of sampling frequencies, wherein the digital audio signal is acquired in compliance with a dynamic adaptive streaming standard;
- determining whether the sampling frequency of the acquired digital audio signal is lower than a clock frequency of an operating clock of a delta-sigma demodulator;
- in response to determining that the sampling frequency of the acquired digital audio signal is lower than the clock frequency of the operating clock of the delta-sigma demodulator, subjecting the acquired digital audio signal to a pre-interpolation process before demodulation of the acquired digital audio signal;
- and
- in response to determining that the sampling frequency of the acquired digital audio signal is not lower than the clock frequency of the operating clock of the delta-sigma demodulator, outputting the acquired digital audio signal for demodulation,
- wherein the delta-sigma demodulator has a sampling frequency having a “power-of-two” relationship with a basic frequency, and
- wherein the basic frequency comprises a compact disc sampling frequency.
Dependencies are inferred from the claim text.