Electrical audio signal processing systems and devices – Including amplitude or volume control
Patent
1991-07-25
1993-06-15
Dwyer, James L.
Electrical audio signal processing systems and devices
Including amplitude or volume control
381108, 455222, H03G 300, H04B 110
Patent
active
052206130
ABSTRACT:
An audio amplifier circuit according to the present invention features an arrangement of a power line with a smoothing capacitor inserted as a power filter and a power line without such a smoothing capacitor. The audio amplifier circuit in which an input stage amplifier of a main amplifier is supplied with power via the former power line has a muting circuit for rapidly charging a negative feedback capacitor for generating negative feedback voltage to be fed back from the following stage of the main amplifier to the input stage amplifier up to a voltage level at which a pop sound is inhibited when the power is supplied and for rapidly discharging the negative feedback capacitor up to a reference operating voltage level when the voltage of the former power line with the smoothing capacitor exceeds a predetermined level, the voltage of the former power line being monitored after the power is supplied from a power supply. In this way, the negative feedback capacitor connected to the input stage amplifier of the main amplifier is caused to perform a muting operation by rapidly charging the capacitor up to a level higher than a pop sound level. A point of time the muting operation terminates is determined by a point of time the negative feedback capacitor is caused to start to discharge itself by rapidly discharging the charge of the negative feedback capacitor.
REFERENCES:
patent: 3896272 (1975-07-01), Takahashi et al.
patent: 4041408 (1977-08-01), Trotnick, Jr.
patent: 4398060 (1983-08-01), Ienaka et al.
Nishioka Kei
San Chung Chien
Chiang Jack
Dwyer James L.
Rohm & Co., Ltd.
LandOfFree
Audio amplifier circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Audio amplifier circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Audio amplifier circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1048861