METHOD AND APPARATUS FOR REDUCING CROSSTALK IN AN INTEGRATED HEADSET

摘要

An audio system has a first channel for receiving a first input signal and driving a first speaker and a second channel for receiving a second input signal and driving a second speaker. A first feedforward circuit couples an input of the second channel circuit to an input of the first channel circuit. A second feedforward circuit couples an input of the first channel circuit to an input of the second channel circuit. Circuit parameters of the first and the second feedforward circuits are determined such that a first detected output signal is zero when the first input signal is non-zero and the second input signal is zero, and a second detected output signal is zero when the second input signal is non-zero and the first input signal is zero. The audio system is configured to operate using the determined circuit parameters for the first and the second feedforward circuits.

主权项

1. An integrated audio signal processing circuit for driving a first speaker and a second speaker, wherein the first and the second speakers share a common ground terminal, the integrated audio signal processing circuit comprising:
a first channel circuit for receiving a first input signal and driving the first speaker, the first channel circuit including a first mixer circuit coupled to a first driver circuit; a second channel circuit for receiving a second input signal and driving the second speaker, the second channel circuit including a second mixer circuit coupled to a second driver circuit; a first signal detection circuit coupled to an output of the first driver circuit and configured for providing a first detected output signal ; a second signal detection circuit coupled to an output of the second driver circuit and configured for providing a second detected output signal ; a first signal attenuation circuit coupled to the first input signal and configured for providing a first correction signal to the second mixer circuit based on the second detected output signal provided by the second signal detection circuit ; and a second attenuation circuit coupled to the second input signal and configured for providing a second correction signal to the first mixer circuit based on the first detected output signal provided by the first signal detection circuit .