Patent ID: 7876911
Filing Date: 2011-01-25
Classification: H04R

Abstract:
1. A headphone driver module comprising: a low-pass filter for providing a filtered stereo sum signal from a stereo sum signal, wherein the low-pass filter has a corner frequency that is within an audio range; a first audio driver for driving the filtered stereo sum signal on a common terminal that is coupled to a right headphone element and a left headphone element; a first high-pass filter for providing a filtered right channel signal from a right channel signal; a second audio driver for driving the filtered right channel signal on a second terminal of the right headphone element; a second high-pass filter for providing a filtered left channel signal from a left channel signal; a third audio driver for driving the filtered left channel signal on a second terminal of the left headphone element; a ground detect module, operatively coupled to the common terminal, for asserting a ground detection signal when the common terminal is coupled to a ground voltage; and a control module, operatively coupled to the first audio driver, for disabling the first audio driver when the ground detection signal is asserted, wherein the control module disables or bypasses filtering of the first high-pass filter when the ground detection signal is asserted so that the second audio driver drives the right channel signal on the second terminal of the right headphone element, and wherein the control module disables or bypasses filtering of the second high-pass filter when the ground detection signal is asserted so that the third audio driver drives the left channel signal on the second terminal of the left headphone element.