Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1994-09-19
1995-12-26
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330146, 330297, H03F 330
Patent
active
054791340
ABSTRACT:
The present invention includes a first push-pull amplifier for amplifying an audio signal, a second push-pull amplifier for inverting and amplifying the audio signal, a switching circuit for switching power from a power source line at a frequency exceeding an audible frequency and feeding the first or second amplifier, a control circuit for controlling a switching period of the switching circuit such that the feeding power is changed correspondingly to a level of the audio signal correspondingly to a first difference in voltage between one of the audio signal and the audio signal amplified by the amplifier and the power or a second difference in voltage between one of the audio signal and the audio signal amplified by the second amplifier and the feeding power and a capacitor provided between the outputs of the first and second amplifiers, a loud speaker being driven by outputs of the first and second amplifiers.
REFERENCES:
patent: 3585517 (1971-06-01), Herbert
patent: 4218660 (1980-08-01), Carver
patent: 5075634 (1991-12-01), French
U.S. Ser. No. 8/199,890 filed Feb. 22, 1994 to Nishioka et al.
U.S. Ser. No. 08/203,307 filed Mar. 1, 1994 to Nishioka et al.
Fujisawa Masanori
Kusaba Katsumi
Nishioka Kei
Mullins James B.
Rohm & Co., Ltd.
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