Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1979-05-31
1981-09-01
Brigance, Gerald L.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
179 1A, 330110, H04R 300
Patent
active
042873894
ABSTRACT:
A negative-feedback circuit for use with a moving-coil loudspeaker and a host amplifier modifies the feedback signal from the output of the host amplifier in such a say that the velocity of the voice coil of the speaker more closely follows the signal voltage input to the host amplifier. The power output of the power amplifier is delivered to the voice coil through a low resistance, and a high resistance feedback path is provided from each side of this low resistance to the input of the host amplifier. Other reactive, resistive and non-linear elements may also be used with the high resistance feedback paths for improved operation.
REFERENCES:
patent: 2358630 (1944-09-01), Fay
patent: 2858373 (1958-10-01), Hollman
patent: 2887532 (1959-05-01), Werner
patent: 2948778 (1960-08-01), Clements
patent: 3525812 (1970-08-01), Verbier
patent: 3889060 (1975-06-01), Goto et al.
patent: 4107620 (1978-08-01), Birman et al.
patent: 4146845 (1979-03-01), Lunquist
patent: 4180706 (1979-12-01), Bakgaard
patent: 4229619 (1980-10-01), Takahashi et al.
"Loudspeaker Feedback Circuit" G. Hibbert, IPC Electrical-Electronic Press Wireless World vol. 82, No. 1488 p. 54 Aug. 1976.
"Feedback-The Newest Old Idea in Speakers", Audio Scene Canada vol. 13 No. 3 p. 13 Mar. 1976, I. G. Masters.
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