Title:
ディジタルアンプ装置及びディジタルアンプ装置のミュート方法
Document Type and Number:
Japanese Patent JP4513021
Kind Code:
B2
Abstract:
A digital amplifier apparatus includes a gain-adjusting section operable to adjust a gain of a digital audio signal; a dither-superposing section operable to superpose a predetermined dither on the digital audio signal; a pulse-width-modulated signal generating section operable to generate a pulse-width-modulated signal corresponding to the digital audio signal; an amplifying section operable to cause a switching element to perform a switching operation in accordance with the pulse-width-modulated signal; a pulse-width changing section operable to change a ratio between a "high" state and a "low" state of the pulse-width modulated signal; and a control section operable to perform a muting process by causing the gain-adjusting section to set the gain of the digital audio signal to a zero level, the dither-superposing section to stop superposing the dither, and the pulse-width changing section to change, step by step, the ratio between the "high" state and the "low" state of the pulse-width modulated signal toward the "low" state upon receipt of a predetermined muting signal for muting the digital audio signal, thereby maintaining the "low" state and stopping the switching operation performed in accordance with the pulse-width modulated signal.
Inventors:
Toshihiko Masuda
Yusuke Yamamoto
Morohoshi Arihiro
Yusuke Yamamoto
Morohoshi Arihiro
Application Number:
JP2005380367A
Publication Date:
July 28, 2010
Filing Date:
December 28, 2005
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H03F1/26; H03F1/00; H03F3/217; H04R3/00
Domestic Patent References:
| JP5055924A | ||||
| JP2004222251A | ||||
| JP2003017945A | ||||
| JP2005123784A | ||||
| JP2004201185A | ||||
| JP2004214998A |
Attorney, Agent or Firm:
Keiki Tanabe
Kazuhiko Saoyama
Kazuhiko Saoyama