Title:
METHOD AND DEVICE FOR CONTROLLING SOUND VOLUME OF ONE-BIT DIGITAL SIGNAL
Document Type and Number:
Japanese Patent JP3453279
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To control with high accuracy the sound volume of analog sound signals, without producing noises at the time of demodulating one-bit signals obtained by delta-sigma modulation.
SOLUTION: A clock signal source 3 generates, in advance, a system clock CK having a sufficiently high frequency synchronously to one-bit signals DAT, and a pulse width control signal generating circuit 2 counts the pulses of the system clock CLK by the number, corresponding to the volume value set by means of a volume setting means 4 and causes flip flops 6 and 7 to output pulses only during that period. Since a volume control signal VOLCTL is a binary signal, noise is not produced due to threshold fluctuation, etc., and pulse width errors become the crystal accuracy of the clock CLK.
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Inventors:
▲高▼橋 竜太郎
Application Number:
JP14145197A
Publication Date:
October 06, 2003
Filing Date:
May 30, 1997
Export Citation:
Assignee:
Sharp Corporation
International Classes:
H04R3/00; H03G3/02; H03M1/12; (IPC1-7): H03G3/02; H03M1/12; H04R3/00
Domestic Patent References:
| JP6335082A | ||||
| JP57119516A | ||||
| JP6387017A | ||||
| JP1155707A | ||||
| JP4162812A | ||||
| JP774641A |
Attorney, Agent or Firm:
Takaya Koike