Acoustic power system
AssigneeBen O. Key
InventorFrancis A. Miller
Life of this patent
Estimating the term…
Abstract
An acoustic power system includes a speaker which generates acoustic energy in response to electrical driving signals. Electrical representations of the acoustic energy generated by the speaker are effectively subtracted from electrical input signals having a preselected frequency response to produce electrical error signals. The error signals are amplified to produce the electrical driving signals which operate the speaker. In the preferred embodiment, the electrical representations of the acoustic energy generated by the speaker are produced by detecting a portion of the impedance produced across the speaker voice coil.
Claims5
The amplifier and loudspeaker system comprising:
- a loudspeaker having a voice coil for producing acoustic energy in response to a current applied thereto;
- an amplifier having an input and an output and an output impedance of the same order-of-magnitude as that of the speaker;
- a first capacitor coupling the output of the amplifier to the loudspeaker;
- an input network comprising a transistor with collector, base and emitter bias resistors, the base of the transistor being the input and the collector being the output;
- a second capacitor coupling the output of the input network to the input of the amplifier;
- and
- feedback means substantially capacitively coupling the terminal of the speaker to which the output of the amplifier is coupled to the emitter of the transistor of the input network.
Dependencies are inferred from the claim text.