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US 12,119,842 B2Granted
Audio signal processing circuit
AssigneeRohm Co., Ltd.
InventorShinji Yamagami
Life of this patent
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Abstract
An oversampling filter oversamples a digital audio signal. A ΔΣ modulator delta-sigma modulates a signal output from the oversampling filter. A D/A converter converts a signal output from the ΔΣ modulator into an analog audio signal. The oversampling filter includes a processor configured to run firmware and a computational algorithm is configurable based on the firmware.
Claims4
An audio signal processing circuit comprising:
- an oversampling filter structured to oversample a digital audio signal;
- a ΔΣ modulator structured to delta-sigma modulate a signal output from the oversampling filter;
- and
- a D/A converter structured to convert a signal output from the ΔΣ modulator into an analog audio signal,
- wherein the oversampling filter includes a processor structured to run firmware and a computational algorithm is configurable based on the firmware,
- wherein the audio signal processing circuit is structured to load a plurality of sets of coefficients for the oversampling filter, and
- wherein the audio signal processing circuit enables the set of coefficients that is to be used to be selected in response to a register setting.
4 more elements
An audio signal processing circuit comprising:
- an oversampling filter structured to oversample a digital audio signal;
- an interface circuit structured to receive a set of coefficients for the oversampling filter, the set of coefficients being encrypted;
- and
- a decoder structured to decode the set of coefficients received by the interface circuit and put the decoded set of coefficients in the oversampling filter.
1 more element
Dependencies are inferred from the claim text.