Autotracking microphone squelch for aircraft intercom systems

Details Autotracking microphone squelch for aircraft intercom systems Autotracking microphone squelch for aircraft intercom systems

1995-07-24

1998-06-30

Kuntz, Curtis

Electrical audio signal processing systems and devices

Monitoring of sound

381110, H04R 2900

Patent

active

057745579

ABSTRACT:
An automatic adjusting threshold microphone squelch system for use in aircraft or other high noise environments including digital drop-out timer and voice detector connected directly to an analog composite signal processor. The processor is comprised of two channels including a microphone audio channel and an aircraft noise detection channel. The channels, driven from a common microphone, are arranged in parallel with the noise detector feeding its noise-dependent output forwardly to a variable-threshold microphone audio post-amplifier. The composite audio from this amplifier is automatically maintained below a first digital "zero" level when voice is absent while containing peaks above a second digital "one" level when audio is present. This composite audio directly feeds the digital detector/timer without further wave-shaping or other signal processing.

REFERENCES:
patent: 4941187 (1990-07-01), Slater
patent: 5563952 (1996-10-01), Mercer

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