Title:
SOUND PROCESSING DEVICE AND CONTROL METHOD OF SOUND PROCESSING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/211697
Kind Code:
A1
Abstract:
This sound processing device is provided with: a signal processing unit which generates a first signal in which components in an acoustic signal that fall below a first frequency are reduced and a second signal in which components in the acoustic signal that fall below a second frequency, higher than the first frequency, are reduced; an output control unit which transitions between a first state in which the first signal is outputted and a second state in which the second signal is outputted; a class D amplifier which amplifies the signal after output from the output control unit; a state determination unit which determines whether or not there is power pumping occurring back to the power supply unit supplying the power-supply voltage to the class D amplifier, or whether or not power pumping could occur; and an operation control unit which controls the output control unit to assume the first state if the determination result from the state determination unit is negative, and controls the output control unit to assume the second state if the determination result is positive.
Inventors:
GOTO MITSUTAKA (JP)
YANAIKE KAZUHIRO (JP)
YANAIKE KAZUHIRO (JP)
Application Number:
PCT/JP2017/018876
Publication Date:
November 22, 2018
Filing Date:
May 19, 2017
Export Citation:
Assignee:
YAMAHA CORP (JP)
International Classes:
H03F3/217; H04R3/00
Foreign References:
| JP2005509306A | 2005-04-07 | |||
| JP5233309B2 | 2013-07-10 | |||
| JPH07288444A | 1995-10-31 | |||
| JP2009239505A | 2009-10-15 | |||
| JP2014154959A | 2014-08-25 | |||
| JPH10126893A | 1998-05-15 |
Attorney, Agent or Firm:
OHBAYASHI, Akira et al. (JP)
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