Signal processing apparatus and method for sound field processing of .SIGMA..DELTA. modulated digital signal
AssigneeSony Corporation
InventorsMasayoshi Noguchi, Gen Ichimura
Life of this patent
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Abstract
A signal processing method and apparatus for performing special-effects processing on a 1 bit .SIGMA..DELTA. modulated signal in which, for amplitutde limiting a .SIGMA..DELTA. modulated 1-bit digital signal, the 1-bit digital signal is temporarily converted into a multi-bit signal. For re-quantizing the converted multi-bit signal, an integrator constituting a .SIGMA..DELTA. re-modulator is controlled by a limiter. This enables the 1-bit digital signal to be amplitude-controlled in the form of the digital signal without converting the 1-bit digital signal into an analog signal.
Claims6
A signal processing device for sound field processing a 1-bit digital signal obtained by .SIGMA..DELTA. modulation comprising:
- conversion means for converting the 1-bit digital signal into a multi-bit signal;
- .SIGMA..DELTA. re-modulation means including an integrator for .SIGMA..DELTA. re-modulating said multi-bit signal converted by said conversion means;
- and
- limiting value control means for controlling a limit value of said integrator of said .SIGMA..DELTA. re-modulation means.
A signal processing method for sound field processing a 1-bit digital signal obtained .SIGMA..DELTA. modulation comprising the steps of:
- converting said 1-bit digital signal into a multi-bit signal;
- .SIGMA..DELTA. re-modulating said multi-bit signal converted by said converting step;
- and
- controlling a limit value of an integrator forming a .SIGMA..DELTA. re-modulator during .SIGMA..DELTA. re-modulation.
Dependencies are inferred from the claim text.