116results about "Anti-side-tone circuits" patented technology

A telephone receiver circuit with sidetone signal generation controlled by voice activity detection in accordance with the present invention uses the voice activity detector (VAD) to detect the presence of voice activity within the microphone signal and dynamically adjust the sidetone signal generation to compensate for noisy environments by eliminating or reducing the sidetone signal in the absence of voice activity. Hence, a sidetone signal is generated in the presence of voice activity, when feedback is required, while the sidetone signal is not generated in the absence of voice activity, since audio feedback for the user is not required then.

Systems and methods for adaptive sidetone and adaptive voice activity detect (VAD) threshold for speech processing are disclosed. The VAD system generally includes an adaptive VAD threshold generator configured to generate a VAD threshold based on an increase in voice level resulting from sidetone attenuation and a comparator for comparing received signals to the adaptive VAD threshold to determine the existence of voice activity. The sidetone attenuation is based on an average ambient noise energy level determined from a noise energy amplitude during periods of no voice activity and a comparator for comparing received signals to the adaptive VAD threshold to determine existence of voice activity.

The invention discloses an echo eliminating device, comprising: an acoustic echo eliminator which receives an echo time-delay value and determine parameters according to the echo time-delay value to eliminate the echo; a downlink voice detecting module which detects whether energy of a received downlink voice signal reaches the prearranged threshold value, if so, an identifier is output; a time-delay computing module which collects the uplink, downlink voice signals, computes correlative coefficient of the uplink, downlink voice signals at the time of receiving the identifier, determines the echo time-delay value corresponding to the maximum value of the correlative coefficient, and sends the echo time-delay value to the acoustic echo eliminator. The invention not only can configure appropriate parameters for terminal by the time of leaving factory, but also can be integrated to update relevant parameters in real time for a part of the acoustic echo eliminator, thereby the invention is apt for variation of the echo time-delay owing to change of the terminal's circumstance and improves effect of echo elimination as well as reduces expenditure of system resource. Meanwhile, the invention also discloses a communication terminal including the echo eliminating device, and a method for determining the echo time-dealy.

This invention describes a mobile phone with a means of measuring a background sound level of an environment. When a user either initiates or receives a phone call, sound levels before and during the call are compared. Once it is decided that the voice is too loud based on a predetermined criteria, the phone gives the user a feedback indicating that the voice is too loud and potentially a disruption to other people. Furthermore, the present invention provides a feedback for a voice adjustment by utilizing a sidetone adaptive signal that filters the user own speech directly to an earpiece.

This invention discloses an improvement to a digital Acoustic Echo Control (AEC) in hands-free telephones. It describes an additional adaptive filter referred to as a residual echo filter, which is placed after the usual echo canceller and it is used to efficiently and accurately estimate a residual echo signal b(i) and a system coupling factor β(i), which can be utilized to establish an efficient control for the AEC system and construct the appropriate filters. The invention also describes a control block means performing a joint operation control of the echo canceller, residual echo suppressor and residual echo filter for achieving more consistent echo cancellation results and enhancing output signal quality.

A handheld telephone set used by connecting a dual-ear mount type or single-ear mount type earphone that automatically sets an optimal signal level of an ambient sound according to the earphone type used, provided with: a telephone set main body unit, a detection device for detecting which type of earphone is mounted to the telephone set main body unit, an amplifier for amplifying the ambient sound to be delivered to the earphone, and a control device for controlling a signal level of the ambient sound output from the amplifier according to an output of the detection device. When either of these earphones is mounted, the control device controls the signal level of the ambient sound output from the amplifier to be fed back according to an output of the detection device.

The present invention includes systems and methods for altering a cellular phone user's speech so that the speech can be less bothersome to third parties in the surrounding area and so that the user has more privacy. Sound cancellation can be used to cancel, reduce, or modify the user's voice so third parties cannot hear the voice as easily or so that the user's voice cannot be understood. Furthermore, the user device can encourage the user to speak in a lower voice. The user device can accomplish this encouragement by indicating to the user their level of speech. In this manner, the user knows when he may lower his voice and yet still provide an adequate volume of speech for the cellular phone. Additionally, the user device can encourage the user to speak in a lower voice by audibly playing back the user's voice in real time.

A speech communication apparatus comprises voice speed conversion means for changing the time scale of a voice signal of a called party which arrives through a telephone line, and sidetone erasure means for erasing a sidetone signal.

The invention discloses a mobile terminal with sound preprocessing and a method thereof, which comprise an audio input/output module a volume control module used for presetting and storing the set value of the contrast relation parameter between the on-site background voice and the voice, a background voice detection module connected with the audio input/output module and used for detecting the condition of the on-site background voice of the environment where the mobile terminal is located when the incoming call is received, a voice extraction module used for acquiring the audio information transmitted from the calling party when the incoming call is received, a voice processing module used for increasing or decreasing the audio information acquired from the voice extraction module according to the set values of the background voice detection module and the volume control module. The invention solves the problem that both parties can not hear the voice from the counter party clearly and simultaneously the good audio effect can not be maintained for the communication between both parties due to the interference of other sounds such as the background noise in the process of using the mobile terminal to carry out the call answering/dialing.

A communication device including multiple microphones is provided. The communication device includes at least two microphones. The communication device further includes a sidetone feedback notifier for producing a notification signal. The sidetone feedback notifier is coupled to the microphones. The notification signal is based on the combination of, a first input audio signal provided for by a first microphone, and a second input audio signal provided for by a second microphone. The sidetone feedback notifier is coupled to a notification device for providing a feedback signal to a user based on the notification signal, which may be an audible, a visual or a tactile signal.

The invention discloses a device with the terminal communication noise suppression function, a method and a communication terminal, and the device comprises a main control chip of the terminal, a first analog switch, a main microphone used for collecting non-earphone communication sound and a reference microphone used for collecting communication noise of the terminal; wherein an output end of the first analog switch is connected with a first microphone interface of the main control chip of the terminal, and the main microphone and the reference microphone are respectively connected with two input ends of the first analog switch; and the main control chip of the terminal is used for controlling the first analog switch to communicate the main microphone and the reference microphone with the main control chip through the time division multiplexing way and collecting the communication sound of the main microphone and the communication noise of the reference microphone for carrying out noise suppression treatment. The device, the method and the communication terminal can reduce the wiring space of a mainboard and effectively save hardware cost while effectively suppressing the communication background noise.

A gain control circuit for a telephone, the circuit comprising a signal strength calculator for calculating the strength of a signal; a gain controller adapted to modify the strength of the signal in accordance with a predetermined criterion based on the strength of the signal calculated by the signal strength calculator.

[PROBLEM]It is an object of the present invention to provide a voice communication apparatus which can prevent its echo suppressing characteristic from being deteriorated in response to the varied relative location of the microphone unit with respect to the speaker unit, and maintain the quality of the near-end signal to be transmitted to the far-end speaker.

[MEANS FOR SOLVING]Herein disclosed is a voice communication apparatus to be provided with a current value detecting unit 131 for detecting a current parameter value related to the relative location of either the first near-end voice converting unit 121 or the second near-end voice converting unit 122 with respect to the far-end signal converting unit 112, each of the first and second near-end signal delay sections 133 and 134 being operative to delay the near-end signal on the basis of the current parameter value detected by the current value detecting unit 131, and the first outputting section 135 being operative to output a signal indicative of the signal difference between the near-end signals respectively delayed by the first and second near-end signal delay sections 133 and 134.

The invention provides a signal processor installed in a communication device. In one embodiment, the signal processor comprises a voice activity detector, a nonlinear echo processor, and a speaker attenuation module. The voice activity detector generates a control signal indicating whether both a far-end talker at a far end and a near-end talker at a near end are speaking or only the far-end talker is speaking. The nonlinear echo processor, controlled by the control signal, cancels more nonlinear echo from the near-end signal in time domain while only the far-end talker is speaking and cancels less nonlinear echo from the near-end signal in time domain while both the far-end talker and the near-end talker are speaking. The speaker attenuation module, controlled by the control signal, attenuates the far-end signal while both the far-end talker and the near-end talker are speaking.

A noise suppressor suppresses noise contained in speech converted by an A/D converter into a digital signal. A sidetone level controller controls a level of a speech signal with the noise suppressed by the noise suppressor, for output as a sidetone. A D/A converter then converts a speech receiving signal with the sidetone added from a digital signal to an analog signal. Therefore, it becomes possible to prevent a level of the sidetone from being changed according to a level of the noise existing in the background of a talker, and to control the sidetone to allow the talker to talk at an appropriate volume.

The embodiment of the invention discloses a voice signal processing method. An energy decay and gain value is set on the background noise signals, a background noise frame which is obtained after hiding the frame to the errors is corresponding to the background noise signals, the difference value between the background noise signals energy decay and gain value which the background noise frame is corresponding to and the signal energy decay and gain value which the previous frame is corresponding to is made to be in the threshold scale. The energy decay and gain value is used for controlling the energy decay of the background noise which the background noise frame is corresponding to. The invention also discloses a voice signal processing device. By using the voice signal processing method and the processing device, the energy transition between the error hiding signal area and the background noise signal area is made to be natural and smooth, and the comfortableness of the hearing of the hearers is improved.

A combined sidetone and hybrid balance apparatus and method of operating same are disclosed. An embodiment of the present invention may provide both a hybrid balance mode of operation and a sidetone generation mode of operation within a single integrated circuit device. The functionality provided by an embodiment of the present invention may be used in both Internet protocol (IP)-based telephones and residential gateways, and may be incorporated within the IP telephone chip used in such devices. An embodiment of the present invention may be used to reduce processor demand and the cost of materials, permitting greater IP telephone or residential gateway functionality at lower cost.

The present invention provides an echo reduction apparatus, system, and method that advantageously reduces echo when communicating over packet-switched networks. An echo reduction apparatus, including echo reduction circuit, operably couples a headset or handset device to an audio source that is capable of transmitting a sound signal. The echo reduction circuit receives the sound signal from the audio source and a transmit signal from the headset or handset device and provides an adjusted sound signal to the audio source. Advantageously, a variety of headsets and handsets may be used in accordance with the present invention with reduced caller echo and without the need to purchase new headsets or handsets.

The invention provides an audio processing method and a mobile terminal. The mobile terminal has at least two screens. The method includes the following steps: when detecting that a first screen and a second screen of the mobile terminal are folded and the mobile terminal is in a call, acquiring an audio signal received by a first audio player on the first screen; generating an interference elimination audio signal according to the audio signal; and making a second audio player on the second screen of the mobile terminal play the interference elimination audio signal. User's voice call content can be prevented from being leaked. The security of user's voice call and the call privacy of users are ensured. The call experience of users is improved.

A proportional self-adaption telephone echo cancellation method based on decorrelation mainly includes the steps that (A) far-end signal filtering is carried out to obtain an output value y (n) of an adaptive filter; (B) a decorrelation operation of an input vector X (n) is conducted to obtain an innovation vector Z (n) of a tap weight vector w (n) of the adaptive filter, namely Z (n)= X (n) - a (n) X (n-1); (C) echo cancellation is carried out, wherein the output value y (n) of the adaptive filter is subtracted from a near-end signal d (n) with an echo picked up by a near-end microphone, then the near-end signal d (n) with the echo is sent back to a far-end, and a loopback signal d (n) is a useful signal e (n) of an identification cancellation echo obtained by subtracting d (n) from y (n), namely e (n)= d (n) - y (n); (D) the tap weight vector of the filter is updated; (E) the equation that n= n+1 is made, and the steps from A to D are repeated until a call is ended. The method has high identification capacity for sparse systems like telephone communication, and is high in convergence rate, low in steady state error and good in echo cancellation effect.

The invention relates to a phone silencer. No device which can help people to eliminate an influence on other people or prevent leakage of important information in answering a phone or calling exists at present. The speech silencer comprises a barrel-shaped shell (1), wherein a silencer is arranged in the barrel-shaped shell; one end of the barrel-shaped shell is provided with a gas inlet (2); the other end of the barrel-shaped shell is provided with a gas outlet (3); and the gas inlet end of the barrel-shaped shell is connected with a mask (4) which is connected with a fixing band (5). The product is used for sound insulation during calling.