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Abstract

An attenuating circuit for attenuating commercial interruptions in an audio signal, the audio signal including at least a first channel audio signal and a second channel audio signal; the attenuating circuit including a first audio channel detection circuit and a second audio channel detection circuit, each of the audio channel detection circuits including a low pass filter mechanism for receiving the audio signal and for passing only low frequency components of the audio signal, with the low frequency components being beneath a determined frequency; a low frequency comparator circuit for generating a low frequency detection signal whenever the amplitude of the low frequency components exceed a first threshold value; a high pass filter mechanism for receiving the audio signal and for passing only high frequency components of the audio signal, the high frequency components being above the determined frequency; and a high frequency comparator circuit for generating a high frequency detection signal whenever the amplitude of said high frequency components exceed a second threshold value. Finally, the circuit includes a logic circuit for receiving the low frequency detection signals and the high frequency detection signals and for generating an attenuating signal if, and only if, both of the low frequency detection signals are active and both of the high frequency detection signals are null; and an attenuation circuit for receiving the attenuation signal and for substantially attenuating the strength of the audio signal whenever the attenuation signal is active.

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