Predictive protection arrangement for electroacoustic transducer

Details Predictive protection arrangement for electroacoustic transducer Predictive protection arrangement for electroacoustic transducer

1994-09-26

1996-06-18

Kuntz, Curtis

Electrical audio signal processing systems and devices

Audio transducer protection circuitry

381 96, 381 59, 381 98, 381106, 381108, 330278, H03C 1100

Patent

active

055286950

ABSTRACT:
This invention relates to an arrangement (14) for protecting a transducer (2) which converts an electric signal into an acoustic or a mechanic signal against overload and destruction. The arrangement is connected to the electric terminals of the transducer and changes the electric input signal under overload condition. This protection arrangement comprises a controller (15), a monitor (16) and an envelope detector (17). The monitor (16) provides a signal indicating the electric or mechanic load of the transducer (2). The peak value of the signal is anticipated by using a predictive filter in the envelope detector (17) or a delay element in the controller (15). If the predicted peak value exceeds an defined limit an attenuation element in the controller (15) is activated and the input signal is changed in time to prevent an overload of the transducer. This invention provides protection of the loudspeaker with a minimum of signal distortion and allows to reduce the head room of the transducer and to convert signals with a higher amplitude.

REFERENCES:
patent: 4131760 (1978-12-01), Christensen
patent: 4225822 (1980-09-01), Kariatsumari
patent: 4430754 (1984-02-01), Ishigaki
patent: 5170437 (1992-12-01), Strahm

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