Excursion limiter

Details Excursion limiter Excursion limiter

2007-09-25

2007-09-25

Lee, Ping (Department: 2615)

Electrical audio signal processing systems and devices

Audio transducer protection circuitry

C381S098000

Reexamination Certificate

active

10213309

ABSTRACT:
An excursion limiter (10) broadly comprises a voltage controlled filter (40) to suppress an audio signal according to a selected threshold at a selected frequency using a control voltage. The voltage controlled filter (40) preferably produces an inversion signal at the frequency, amplifies the inversion signal according to the control voltage to produce a suppression signal, and combines the audio signal with the suppression signal, thus suppressing the audio signal at the frequency and creating a resultant signal. A control voltage generator (42) preferably generates the control voltage using a frequency compensation filter (58), a full-wave rectifier (60), a precision half-wave rectifier (61) and a non-linear compensator (62). The frequency compensation filter (58) isolates an initial component which is rectified by the full-wave rectifier (60), shifted, and rectified again at the precision rectifier (61) before being essentially flattened in a non-linear manner by the non-linear compensator (62).

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patent: 0122663 (1984-04-01), None
patent: 0886457 (1998-12-01), None

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