MICROPHONE AND INTEGRATED CIRCUIT CAPIBLE OF ECHO CANCELLATION
First Claim
1. A microphone, comprising:
- a microphone cartridge, receiving a sound and converting the sound to a first signal;
an integrated circuit, coupled to the microphone cartridge, receiving a reference signal from a baseband processor, canceling an echo component from the first signal according to the reference signal to obtain a second signal, and outputting the second signal to the baseband processor, wherein the reference signal has a digital format and is sent from a remote side;
wherein a data line is coupled between the integrated circuit and the baseband processor, and the integrated circuit receives the reference signal and outputs the second signal via a data line.
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Accused Products
Abstract
The invention provides an integrated circuit of a microphone. In one embodiment, the integrated circuit receives a first signal converted from a sound and receives a reference signal with a digital format for echo cancellation. In one embodiment, the integrated circuit comprises a pre-amplifier, an analog-to-digital converter, a digital signal processor, and a post amplifier. The pre-amplifier amplifies the first signal according to a first gain to obtain a third signal. The analog-to-digital converter converts the third signal from analog to digital to obtain a fourth signal. The digital signal processor cancels an echo component from the fourth signal according to the reference signal to obtain a fifth signal, and determines the first gain and a second gain, wherein a product of the first gain and the second gain is kept constant, and the first gain is determined so that an amplitude of the third signal is kept equal to an amplitude of the reference signal. The post-amplifier amplifies the fifth signal according to the second gain to obtain a second signal as an output of the integrated circuit.
7 Citations
20 Claims
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1. A microphone, comprising:
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a microphone cartridge, receiving a sound and converting the sound to a first signal; an integrated circuit, coupled to the microphone cartridge, receiving a reference signal from a baseband processor, canceling an echo component from the first signal according to the reference signal to obtain a second signal, and outputting the second signal to the baseband processor, wherein the reference signal has a digital format and is sent from a remote side; wherein a data line is coupled between the integrated circuit and the baseband processor, and the integrated circuit receives the reference signal and outputs the second signal via a data line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An integrated circuit of a microphone, wherein the integrated circuit receives a first signal converted from a sound and receives a reference signal with a digital format for echo cancellation, comprising:
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a pre-amplifier, amplifying the first signal according to a first gain to obtain a third signal; an analog-to-digital converter, converting the third signal from analog to digital to obtain a fourth signal; a digital signal processor, canceling an echo component from the fourth signal according to the reference signal to obtain a fifth signal, and determining the first gain and a second gain, wherein a product of the first gain and the second gain is kept constant, and the first gain is determined so that an amplitude of the third signal is kept equal to an amplitude of the reference signal; and a post-amplifier, amplifying the fifth signal according to the second gain to obtain a second signal as an output of the integrated circuit. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification