Electrical audio signal processing systems and devices – Including amplitude or volume control
Patent
1993-02-24
1994-09-06
Isen, Forester W.
Electrical audio signal processing systems and devices
Including amplitude or volume control
H03G 300
Patent
active
053455118
ABSTRACT:
A digital signal attenuation circuit for a CD-I player, specially designed to digitally attenuate an audio signal read-out from a CD-I disc, which comprises a 1/6 divider for dividing by 6 an attenuation control signal inputted from a controller and outputting a quotient signal and a remainder signal, a first attenuator for attenuating a 16-bit parallel digital audio signal obtained from a CD-I disc by -1 dB within the range of 0 to -5 dB in accordance with the remainder signal from the 1/6 divider, and a second attenuator for attenuating an output signal of the first attenuator by -6 dB within the range of 0 to -96 dB in accordance with the quotient signal from the 1/6 divider. According to the invention, the audio signal can be attenuated precisely by -1 dB within the range of 0 to -96 dB, not depending on the environmental conditions, and the overall attenuation circuitry can be highly simplified.
REFERENCES:
patent: 4454498 (1984-06-01), Southard
patent: 4731851 (1988-03-01), Christopher
"Serial Control Type Electronic vol. Control", CMOSLSI, LC753-Jun. 1991.
Kim Sung H.
You Byung S.
Goldstar Co. Ltd.
Isen Forester W.
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