Patent ID: 6360203
Filing Date: 2002-03-19
Classification: H04M

Abstract:
A dynamic voice operated filtering system for use in an aircraft voice intercom system, the aircraft voice intercom system having an acoustic input device and an acoustic output device, the acoustic input device being configured to provide an acoustic input signal that can have a plurality of combinations of speech and ambient noise components, the acoustic output device being configured to provide an acoustic output signal as a function of a received signal, the system comprising:a first limiter coupled to receive the acoustic input signal, wherein the first limiter is configured to actively adjust a signal strength of the acoustic input signal to provide a first limited signal; an expander coupled to the first limiter, wherein the expander is configured to process the first limited signal to provide an expanded signal having an amplitude that is a function of the amplitude of the first limited signal; a second limiter coupled to the expander, wherein the second limiter is configured to actively adjust a signal strength of the expanded signal to provide an output signal, the output signal being provided to the acoustic output device; and a control circuit coupled to the first and second limiters, wherein the control circuit is configured to change the configuration of the first limiter in adjusting the signal strength of the acoustic input signal in response to an adjustment of the control circuit by a user.