41results about How to "Echo Cancellation" patented technology

The present invention relates to a communication device and a telephone communication method thereof. The present invention includes two or more microphones mounted at different positioned in a predetermined space, e.g., in a vehicle. Further, a detector compares selectively the signal-to-noise ratios, sound quality states, volume intensities or the like of signals input through the microphones, and detects the most optimal signal as a telephone communication signal in the signals. Echo and / or howling contained in the input signal when one talks over the telephone with a communication counterpart is removed through an echo remover in accordance with the control operation of a controller. Furthermore, if signals are input to the others of the microphones while the telephone communication is performed, the telephone communication is continuously performed by comparing the input signals with the signal input to the microphone through which the telephone communication has been performed and selecting a microphone with the most optimal telephone communication signal. Accordingly, there is an advantage in that occupants except a driver can conveniently talk over the telephone using any one of two or more microphones installed in a vehicle, and the telephone communication can be performed with an optimal telephone communication signal although a talker is changed.

The invention discloses a method for eliminating the echo of a receiver from an opposite side in a handfree state of a mobile phone. The method comprises the following steps of acquiring a sound signal transmitted from the opposite side when the handfree mode in the mobile phone of one side is opened; reversely operating the acquired sound signal transmitted from the opposite side; acquiring a sound signal of the receiver of the mobile phone from the one side; carrying out overlay processing on the sound signal, transmitted from the opposite side and subjected to the reversed operation, and the sound signal of the receiver of the mobile phone from the one side. The method disclosed by the invention is simple and practical; the echo of the receiver from the opposite side is eliminated by reversed operation and overplay processing on the sound signal, so that the call quality of two sides for communication is improved. In addition, the invention also discloses a device for eliminating the echo of the receiver from the opposite side in the handfree state of the mobile phone.

The invention discloses a method for eliminating echo and receiving numbers. The method includes: performing energy calculation on the received number signal to obtain signal energy; analyzing the number according to the received number signal and recording the receiving time; comparing the signal energy and receiving time of the number received this time and the number received last time, if they If the signal energy difference between them is greater than the set threshold value, and the receiving time difference is less than the set time value, then it is confirmed that the number received this time is an echo received number, and the number is discarded. Correspondingly, the present invention discloses a conference system capable of eliminating echo and receiving numbers. The present invention can effectively eliminate the echo collection.

The invention disclosed a communication device and its reception method.The communication device contains a digital / simulation converter, one -inverted response filter circuit, and an analog / digital converter.Digital / analog converters receive a first digital signal to generate an analog signal in a vein form.The negative response filter circuit receives a difference signal generated by the analog signal of a receiving signal and the pulse form, and adjusts the response of the reverse response filter circuit to generate a post -adjustment signal.The analog / digital converter simulates the adjustment signal to the digital conversion to generate a second digital signal.

The embodiment of the invention discloses a volume adjustment method and device, an apparatus and a memory medium. The method comprises the steps of receiving an environment sound signal collected byat least one microphone; and adjusting local output volume according to the environment sound signal and a sound signal output by a local, thereby enabling the local output volume is lower than environment volume. Through application of the technical scheme provided by the invention, the echo interference can be improved, and the user experience can be improved.

A broadcast intercom system based on an IP network, comprising an IP network intercom host, an IP network intercom extension, and an IP network address box that realize mutual communication through a local area network or a wide area network; the IP network intercom host, the IP network intercom extension Respectively comprising a first voice acquisition module and a core processor integrated with a first duplex echo cancellation circuit, a second voice acquisition module and a core processor integrated with a second duplex echo cancellation circuit, the first voice acquisition module and The second voice collection module includes a first programmable amplifier and a third programmable amplifier respectively, and the audio sampling rate when the first programmable amplifier and the third programmable amplifier perform analog-to-digital conversion is 32K. The invention well improves the sound effect of the duplex intercom.