Music reproducing device

Patent metadata

Field	Value
Publication number	US-2017063320-A1
Application number	US-201615238644-A
Country	US
Kind code	A1
Filing date	Aug 16, 2016
Priority date	Sep 1, 2015
Publication date	Mar 2, 2017
Grant date	—

Abstract

To realize active control ground that sets inverted output of an amplification circuit to ground with simple configuration.
A DAP 1 comprises a positive side DAC 7 that D/A-converts digital audio data into analog audio data, a positive side amplification circuit 9 that amplifies the analog audio data that the DAC 7 D/A-converts, a negative side DAC 8 that D/A-converts the digital audio data into the analog audio data, and a negative side amplification circuit 10 that amplifies the analog audio data that the DAC 8 D/A-converts, and a CPU 2. The CPU 2 mutes the DAC 8 in case of an ACG mode that sets output of the amplification circuit 10 to ground.

First claim

What is claimed is:

1 . A music reproducing device comprising: a first D/A converter that D/A-converts a digital audio signal into an analog audio signal for a non-inverted signal;
a first amplification circuit that amplifies the analog audio signal that the first D/A converter D/A-converts for a non-inverted signal; a second D/A converter that D/A-converts the digital audio signal into the analog audio signal for an inverted signal; a second amplification circuit that amplifies the analog audio signal that the second D/A converter D/A-converts for an inverted signal; and a controller, wherein the controller mutes the second D/A converter in case of an active control ground mode that sets output of the second amplification circuit to ground.

2 . A music reproducing device comprising: a first D/A converter that D/A-converts a digital audio signal into an analog audio signal for a non-inverted signal;
a first amplification circuit that amplifies the analog audio signal that the first D/A converter D/A-converts for a non-inverted signal; a second D/A converter that D/A-converts the digital audio signal into the analog audio signal for an inverted signal; a second amplification circuit that amplifies the analog audio signal that the second D/A converter D/A-converts for an inverted signal; and a controller, wherein the controller sets volume of the second D/A converter to zero in case of an active control ground mode that sets output of the second amplification circuit to ground.

Assignees

• Onkyo Kk

Inventors

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

Classifications

• H03G3/341 Primary

  Muting when no signals or only weak signals are present (H03G3/344, H03G3/345 take precedence) · CPC title

• H03F3/183

  with semiconductor devices only · CPC title

• H03M1/66

  Digital/analogue converters ({H03M1/001 – } H03M1/10 take precedence) · CPC title

• H04R5/04 Primary

  Circuit arrangements, {e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments (combinations of amplifiers H03F3/68; stereophonic systems H04S)} · CPC title

• H03F2200/03

  the amplifier being designed for audio applications · CPC title