Patent ID: 6639987
Filing Date: 2003-10-28
Classification: H03G,H04R

Abstract:
A communication device comprising:an earpiece for transmitting an acoustic output signal from the communication device; a sensor, wherein the sensor is proximately located with the earpiece, for measuring an acoustic pressure at the earpiece and generating a response signal; and an active equalization circuit coupled to the sensor and receiving the response signal for equalizing the acoustic output signal at the earpiece, wherein the active equalization circuit comprises: an audio processing block for receiving and processing a plurality of audio signals, thereby generating a digital input signal; a digital signal processor coupled to the audio processing block for receiving and filtering the digital input signal, wherein the digital signal processor comprises: an adjustable equalization filter, for filtering the digital input signal using a filter response, thereby generating a filtered audio signal, wherein the filter response is adjusted in response to an adjustment signal received from an adaptation circuit, and the adaptation circuit coupled to the adjustable equalization filter and further coupled to the sensor, wherein the adaptation circuit uses the digital input signal and the response signal to generate the adjustment signal; and an output audio processing block coupled to the digital signal processor for receiving and processing the filtered audio signal and sending the processed filtered audio signal to the earpiece.