Onkyo Corporation

Kuniaki Yamamoto

Tetsuya Nagano

To prevent that the noise occurs at timing switching between PCM data and DSD data by a simple configuration. An AV receiverincludes a mute circuitthat mutes output from a DAC, a detection circuitthat detects that a digital audio signal is zero data and supplies a detection signal, a microcomputerthat supplies a control signal at timing switching from PCM data to DSD data before switches from PCM mode that the DACconverts PCM data into an analog audio signal to DSD mode that the DACconverts DSD data into the analog audio signal, and an AND circuitthat activates the mute circuitin case that the detection signal from the detection circuitand the control signal from the microcomputerare supplied.

Audio processing device

To be able to activate a self-device when an input digital audio signal is an audio signal indicating sound. An AV receiverincludes a detection circuitthat detects that a digital audio signal terminal is connected and supplies a detection signal, a DIRthat converts an SPDIF signal into an I2S signal when the detection circuitsupplies the detection signal, a detection circuitthat detects that the I2S signal into which the DIRconvers is an audio signal indicating sound and supplies a detection signal, and a microcomputerthat activates the AV receiverwhen the detection circuitsupplies the detection signal.

Growing community of inventors

Osaka, Japan

Kuniaki Yamamoto