Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1978-10-31
1980-10-21
Morrison, Malcolm A.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
179 1F, 179 1GP, 330109, H04R 300
Patent
active
042296196
ABSTRACT:
A multi way speaker system comprises an amplifier, frequency dividing network including a plurality of filters, a plurality of speakers respectively responsive to the output signals of the filters, and a summing circuit responsive to the output signals of the filters for producing a composite signal to be fed back to the input of the amplifier to establish a negative feedback loop. Because of the feedback loop undesirable influences by various elements included in the filters are diminished and thus the speakers reproduce audio frequencies with high fidelity. At least one equalizer may be employed in the feedback loop, while auxiliary filters may be used in such a manner that the output terminals of the auxiliary filters are connected to only the summing circuit so that the output signals of the auxiliary filters are added to an output signal of at least one filter of the frequency dividing network. In order to supply the network with the output signal of the amplifier and to feed the composite signal back to the amplifier a three-wire coaxial cable may be used. The three-wire coaxial cable is used in such a manner that the composite signal flows through a conductor which is shielded by another conductor carrying the output signal of the amplifier. A switch and a resistor network may be used in the feedback loop for avoiding undesirable oscillation and output level variation.
REFERENCES:
patent: 3798374 (1974-03-01), Meyers
patent: 3821473 (1974-06-01), Mullins
patent: 3889060 (1975-06-01), Goto et al.
patent: 3924072 (1975-12-01), Turner et al.
patent: 4118600 (1978-10-01), Stahl
Funasaka Eiichi
Kaizu Yasuo
Shinozaki Masanobu
Takahashi Nobuaki
Kemeny E. S.
Morrison Malcolm A.
Victor Company of Japan , Limited
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