Acoustic shock prevention

Details Acoustic shock prevention Acoustic shock prevention

2007-09-18

2007-09-18

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Audio transducer protection circuitry

C379S386000

Reexamination Certificate

active

10660336

ABSTRACT:
Acoustic shock is reduced by attenuating an input signal based on tones detected through frequency domain analysis. The spectrum of the input signal is obtained. A relative energy signal includes a plurality of relative energy elements, each representing the relative energy in a corresponding frequency bin of the input signal spectrum. A difference signal includes a plurality of difference elements, each representing a difference between a corresponding frequency bin value and an adjacent frequency bin value. A plurality of detection signals are determined, each detecting the presence of a sound element in the input signal based on at least one of the relative energy signal and the difference signal. The detection signals are combined to produce an attenuation signal for attenuating the input signal.

REFERENCES:
patent: 5550924 (1996-08-01), Helf et al.
patent: 6785382 (2004-08-01), McLaughlin et al.
patent: 6834108 (2004-12-01), Schmidt
patent: 2005/0018862 (2005-01-01), Fisher
patent: 2005/0031061 (2005-02-01), Ojard et al.
“Soundshield”, http://www.polaris.com.au/soundshield/html.
“Soundshield”, http://www.teleman.com.au/au/headset-soundshield.asp.

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