Electrical audio signal processing systems and devices – Loudspeaker feedback
Patent
1995-08-14
1997-04-29
Isen, Forester W.
Electrical audio signal processing systems and devices
Loudspeaker feedback
381 59, H04R 300
Patent
active
056256981
ABSTRACT:
The speaker system includes a speaker having first and second terminals. An audio amplifier is included having an output terminal connected to the first speaker terminal. A control loop is included which adjusts the level of a signal applied to the speaker in response to changes in the impedance thereof. The control loop includes a current sensing component connected between the second terminal of the speaker and ground. A differential input operational amplifier having first and second differential input terminals and an output terminal is included, the output terminal of which is connected to an input terminal of the amplifier. A first feedback path is provided, which includes a first resistor connected between the output terminal of the operational amplifier and the first input terminal thereof. A second feedback path is provided between the second terminal of the speaker and the second terminal of the operational amplifier. A load is connected between the inverting input terminal of the operational amplifier and ground.
REFERENCES:
patent: 3889060 (1975-06-01), Goto et al.
patent: 4406921 (1983-09-01), Von Recklinghausen
patent: 4797933 (1989-01-01), Hahne
patent: 4969195 (1990-11-01), Noro
patent: 5014320 (1991-05-01), Nagi et al.
patent: 5197102 (1993-03-01), Sondermeyer
patent: 5408533 (1995-04-01), Reiffin
Scidmore, Allan K, "Linear Active Circuits Lecture Notes", University of Wisconsin, 1991.
Stahl, K.E., "Synthesis of Loudspeaker Mechanical Parameters by Electrical Means" Audio Eng Soc, vol. 29, No. 9, Sep. 1981.
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