Music reproducing device with first and second D/A converters for converting audio signals prior to inversion

Patent metadata

Field	Value
Publication number	US-9712919-B2
Application number	US-201615238634-A
Country	US
Kind code	B2
Filing date	Aug 16, 2016
Priority date	Sep 1, 2015
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

To reduce signal output and wiring to a D/A converter (DAC).
A DAP 1 comprises a DAC 7 that D/A-converts LR 2 channels digital audio data into LR 2 channels analog audio data, an amplification circuit 9 that amplifies the LR 2 channels analog audio data that the DAC 7 D/A-converts, a DAC 8 that D/A-converts the LR 2 channels digital audio data into the LR 2 channels analog audio data, and an amplification circuit 10 that amplifies inverted LR 2 channels analog audio data that the LR 2 channels analog audio data that the DAC 8 D/A-converts is inverted.

First claim

What is claimed is:

1. A music reproducing device having a balanced output and an unbalanced output, comprising:
a first D/A converter which converts a left channel digital audio signal and a right channel digital audio signal into a left channel analog audio signal and a right channel analog audio signal, respectively;
a first amplification circuit that amplifies the left channel analog audio signal and the right channel analog audio signal output by the first D/A converter;
a second D/A converter which converts the left channel digital audio signal and the right channel digital audio signal into another left channel analog audio signal and another right channel analog audio signal, respectively; and
a second amplification circuit that amplifies the another left channel analog audio signal and the another right channel analog audio signal output by the second D/A converter, and outputs the another left channel analog audio signal and the another right channel analog audio signal in an inverted state relative to the left channel analog audio signal and the right channel analog audio signal, respectively.

2. The music reproducing device according to claim 1 , further comprising:
a first power source circuit that supplies power source voltage to the first D/A converter and the first amplification circuit;
a second power source circuit that supplies power source voltage to the second D/A converter and the second amplification circuit; and
a controller,
wherein, in the case of utilizing the unbalanced output, the controller shuts down the second power source circuit whereas the first power source continues to supply power source voltage to the first D/A converter and the first amplification circuit.

Assignees

• Onkyo Kk

Inventors

• Asao Kei
• Kawaguchi Tsuyoshi
• Yoshida Makoto
• SHIOZAKI Takanori
• Nakanishi Yoshinori
• Asahara Hiroyuki
• Kitagawa Norimasa

Classifications

• H04S1/007

  in which the audio signals are in digital form (data reduction aspects thereof based on psychoacoustics G10L19/02) · CPC title

• H03F2200/03

  the amplifier being designed for audio applications · CPC title

• H03F3/45475

  using IC blocks as the active amplifying circuit · CPC title

• H03F2203/7227

  the gated amplifier being switched on or off by a switch in the supply circuit of the amplifier · CPC title

• H03F3/72

  Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal · CPC title