Method for echo control of a wireless headset
The present invention provides a wireless headset with echo control and noise cancellation. The present invention also provides a method with phase reversion for echo control of a wireless headset wherein the wireless headset comprises closely disposed speakers and acoustic sensors. The present invention further provides a method with beamforming for noise cancellation of a wireless headset wherein the wireless headset comprises two separate units disposed in distance, and wherein each unit comprises an acoustic sensor.
1. A method for echo control of a wireless headset wherein the wireless headset comprises closely disposed speakers and audio microphones, said method comprising:
inverting the phases of the output audio signals from the speakers; thereby when two speakers are employed, the phases of the output audio signals from one speaker are inverse to that from the other speaker; and
suppressing the signals from the speakers that are picked up by the audio microphones due to the inverse phases of the output audio signals from the speakers, resulting in echo control.
2. The method of claim 1 , wherein the step of inverting the phases comprises employing an electronic circuitry so that the sound waves produced by the two speakers are inverse in terms of phases.
3. The method of claim 1 , wherein the step of inverting the phases comprises employing a software that can inverse the phases of audio signals.
4. The method of claim 1 wherein the suppressing step employs a digital beamformer, wherein the digital beamformer comprises a filter coefficients module for filtering noises and an adder for summing the signals from the audio microphonese before outputting the added signals.