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Steven B Cullison DeceasedWoodland, CA
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Woodland, CA
Hacienda Heights, CA
Garden Grove, CA
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Us Patents
Loudspeaker Overload Protection Circuit
US Patent:
4296278, Oct 20, 1981
Filed:
Jan 5, 1979
Appl. No.:
6/001307
Inventors:
Steven B. Cullison - Garden Grove CA
Charles B. Slack - Costa Mesa CA
Charles B. Slack - Costa Mesa CA
Assignee:
Altec Corporation - Anaheim CA
International Classification:
H04R 300
H03K 508
H03K 508
US Classification:
179 1VL
Abstract:
The output of an audio power amplifier fed to a loudspeaker driver is sensed and when this output exceeds a predetermined level, a switch control circuit operates to place a current limiting device, such as a power resistor, in series with one of the driver feed lines, thereby reducing the power fed thereto. An indicator may also be provided to indicate when the overload condition exists. Operation is made more accurate and distortion minimized by employing separate sensing and power channels in the circuit, the first of these channels operating to sense the overload while the second of these channels utilizes a portion of the amplifier output for driving the switch control circuit for placing the power limiter in the speaker line. The sensing channel is designed to sense the average voltage of the amplifier output, thus providing control more directly responsive to power. The power channel is designed to use audio power from the amplifier output only occasionally, thus producing a minimum of distortion.
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