Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1994-03-01
1995-06-13
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330297, 330146, H03F 326
Patent
active
054246849
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 and 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, a loud speaker being driven by outputs of the first and second amplifiers.
REFERENCES:
patent: 4218660 (1980-08-01), Carver
patent: 4472687 (1984-09-01), Kashiwagi et al.
patent: 4507619 (1985-03-01), Dijkstra et al.
patent: 4752747 (1988-06-01), Botti et al.
patent: 5075634 (1991-12-01), French
patent: 5200711 (1993-04-01), Andersson et al.
Fujisawa Masanori
Nishioka Kei
Mullins James B.
Rohm & Co., Ltd.
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