Patent ID: 9008322
Filing Date: 2015-04-14
Classification: H03F,H03G

Abstract:
1. An audio amplifier circuit configured to provide an output signal to an audio transducer, said audio amplifier circuit comprising: an audio power amplifier having first and second inputs and an output, the audio power amplifier being configured to receive an audio signal at the first input and generate said output signal at the output; an audio sensor configured to detect an audible sound, said audible sound having a noise component, said audio sensor being configured to generate a detected signal; and a processing block circuit configured to receive said detected signal, generate an off signal, and provide the off signal to the second input of said audio power amplifier, said processing block circuit being configured to identify said noise component of said detected signal and generate a reference signal by processing said detected signal according to said input signal, said processing block circuit also being configured to generate said off signal when a value of said input signal is lower than a value of said reference signal.