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US 9,438,362 B2Granted
Audio mixing device, method thereof, and electronic device
AssigneeRicoh Company, Ltd.
InventorYukihiro Imai
Life of this patent
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Abstract
An audio mixing device includes: an adder that adds a plurality of PDM signals each converted from a plurality of digital audio signals; a D/A converter that performs D/A conversion on a digital audio signal outputted from the adder and outputs an analog audio signal; and a synchronization device that is provided prior to the adder, and that synchronizes each of a plurality of digital signals with one another by use of the same predetermined synchronization timing signal and outputs each of them to the adder.
Claims3
An audio mixing device, comprising:
- a plurality of pulse density modulation (PDM) signal generators that receive a plurality of respective digital audio signals and perforin pulse density modulation (PDM) on the received digital audio signals to generate a plurality of respective PDM signals;
- a synchronization device that synchronizes each of the plurality of PDM signals with one another by use of a same predetermined synchronization timing signal, to generate a plurality of respective synchronized PDM signals;
- an adder that adds the plurality of synchronized PDM signals to generate a digital audio signal;
- and
- a D/A converter that performs D/A conversion on the digital audio signal generated by the adder, to generate an analog audio signal.
2 more elements
An audio mixing method, performed by an audio mixing device, the method comprising:
- (a) performing pulse density modulation (PDM) on a plurality of digital audio signals to generate a plurality of respective PDM signals;
- (b) synchronizing each of the plurality of PDM signals with one another by use of a same predetermined synchronization timing signal, to generate a plurality of respective synchronized PDM signals;
- (c) adding, by the audio mixing device, the plurality of synchronized PDM signals to generate a digital audio signal;
- and
- (d) performing, by the audio mixing device, D/A conversion on the digital audio signal that was generated in (c), to generate an analog audio signal.
2 more elements
Dependencies are inferred from the claim text.