Audio D/A converter
AssigneeRohm Co., Ltd.
InventorShinji Yamagami
Life of this patent
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Abstract
An audio D/A converter includes: a first segment D/A converter including N elements; a second segment D/A converter including N elements; a first oversampling filter configured to process a PCM signal; a second oversampling filter configured to process a PCM signal; a first multilevel ΔΣ modulator configured to process an output of the first oversampling filter; a second multilevel ΔΣ modulator configured to process an output of the second oversampling filter; a first switching controller configured to control the first segment D/A converter according to an input to the first switching controller; and a second switching controller configured to control the second segment D/A converter according to an input to the second switching controller.
Claims3
An audio D/A converter for processing a PCM signal, comprising:
- a first segment D/A converter including N elements;
- a second segment D/A converter including N elements;
- a first oversampling filter configured to process the PCM signal;
- a second oversampling filter configured to process the PCM signal;
- a first multilevel ΔΣ modulator configured to process an output of the first oversampling filter;
- a second multilevel ΔΣ modulator configured to process an output of the second oversampling filter;
- a first switching controller configured to control the first segment D/A converter according to an input to the first switching controller;
- and
- a second switching controller configured to control the second segment D/A converter according to an input to the second switching controller,
- wherein the audio D/A converter is switchable between a stereo mode and a mono mode,
- wherein in the stereo mode, the PCM signal is distributed to be input to the first oversampling filter and the second oversampling filter, the number of gradations of outputs of the first multilevel ΔΣ modulator and the second multilevel ΔΣ modulator is N, the output of the first multilevel ΔΣ modulator is supplied to the first switching controller, and the output of the second multilevel ΔΣ modulator is supplied to the second switching controller, and
- wherein in the mono mode, the PCM signal is input to the first oversampling filter, the number of gradations of the output of the first multilevel ΔΣ modulator is 2×N, and the output of the first multilevel ΔΣ modulator is distributed and supplied to the first switching controller and the second switching controller.
Dependencies are inferred from the claim text.