Title:
SPEAKER CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2015/012401
Kind Code:
A1
Abstract:
In one mode of the present invention, a speaker control device is provided with: an oscillator which is connected in parallel to a drive circuit for driving a speaker, and in which the oscillation frequency changes in accordance with the voltage; and a control circuit which controls the current amount that the drive circuit supplies to the speaker if a fluctuation in the oscillation frequency of the oscillator is detected and a fluctuation including a drop in the voltage surpassing a permissible value is detected. Moreover, the oscillator may be a ring oscillator device. Furthermore, the ring oscillator device may contain an inverter circuit configured from a PMOS transistor and an NMOS transistor.
Inventors:
YASUDA AKIRA (JP)
OKAMURA JUN-ICHI (JP)
OKAMURA JUN-ICHI (JP)
Application Number:
PCT/JP2014/069748
Publication Date:
January 29, 2015
Filing Date:
July 25, 2014
Export Citation:
Assignee:
TRIGENCE SEMICONDUCTOR INC (JP)
International Classes:
H04R3/00; H04R3/04
Foreign References:
| JP2007110369A | 2007-04-26 | |||
| JP2010167912A | 2010-08-05 | |||
| JPH0799698A | 1995-04-11 | |||
| JP2006191250A | 2006-07-20 |
Attorney, Agent or Firm:
Takahashi, Hayashi and Partner Patent Attorneys, Inc. (JP)
Patent business corporation Takahashi and wood and partners (JP)
Patent business corporation Takahashi and wood and partners (JP)
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