Fortemedia, Inc.

Xiaoyan Lu

Ming Zhang

Qing-Guang Liu

Weiping Zhang

A method for improving voice quality is provided herein. The method includes receiving acoustic signals from a microphone array; receiving sensor signals from an accelerometer sensor of the headset; generating, by a beamformer, a speech output signal and a noise output signal according to the acoustic signals; best-estimating the speech output signal according to the sensor signals to generate a best-estimated signal; and generating a mixed signal according to the speech output signal and the best-estimated signal.

Method and device for improving voice quality

A sound identification device is provided. The sound identification device includes a microphone array and a processing unit. The microphone array includes a plurality of microphones disposed within a microphone module mounted on a housing of the sound identification device. Each microphone receives an acoustic signal caused by a gesture performed on a surface of the microphone module and converts the received acoustic signal to a digital acoustic signal. The processing unit is configured to receive the digital acoustic signal from each microphone, and perform a sound identification process on the digital acoustic signal from each microphone to generate a sound identification result conveying information of the gesture. The processing unit controls at least one application program executed by the processing unit according to the sound identification result.

Sound identification device with microphone array

The invention provides a phase calibration module, calibrating phase mismatch between microphone signals output by a plurality of microphones of an array microphone. In one embodiment, the phase calibration module comprises a subband filter, a delay calculation module, and a delay compensation filter. The subband filter extracts a high frequency component and a low frequency component from each of the microphone signals to obtain a plurality of high-frequency component signals and a plurality of low-frequency component signals. The delay calculation module calculates delays between the low-frequency component signals. The delay compensation filter then compensates the low-frequency component signals for phase mismatches therebetween according to the calculated delays to obtain a plurality of calibrated low-frequency component signals.

Method for phase mismatch calibration for an array microphone and phase calibration module for the same

A small array microphone system includes an array microphone having a plurality of microphones and operative to provide a plurality of received signals, each microphone providing one received signal. A first voice activity detector (VAD) provides a first voice detection signal generated using the plurality of received signals to indicate the presence or absence of in-beam desired speech. A second VAD provides a second voice detection signal generated using the plurality of received signals to indicate the presence or absence of out-of-beam noise when in-beam desired speech is absent. A reference signal generator provides a reference signal based on the first voice detection signal, the plurality of received signals, and a beamformed signal, wherein the reference signal has the desired speech suppressed. A beamformer provides the beamformed signal based on the second voice detection signal, the reference signal, and the plurality of received signals, wherein the beamformed signal has noise suppressed. A multi-channel noise suppressor operative to further suppress noise in the beamformed signal and provide an output signal. A speech reliability detector provides a reliability detection signal indicating the reliability of each frequency subband. The first voice detection signal, the second voice detection signal, the reliability detection signal and the output signal are provided to the speech recognition engine.

Method and apparatus for noise suppression in a small array microphone system

The invention provides an Internet communication device. The Internet communication device plays a remote audio signal received via a network and transmits an audio signal back to the remote party to complete the communication. The Internet communication device comprises a line-in speech detection module and a line-in channel control module. The line-in speech detection module detects whether the remote audio signal is speech or not to generate a remote speech detection result. The line-in channel control module then attenuates the remote audio signal if the remote speech detection result indicates that the remote audio signal is not speech, thus, all noise including non-stationary noise is removed from the remote audio signal.

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Nanjing, China

Xiaoyan Lu