72 results about "Sidetone" 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.

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.

In an audio processing device, a method and system for improved CODEC with polyringer are provided. An audio CODEC may comprise an audio ADC, an audio DAC, and a sidetone generator. Data from an external microphone may be processed by an audio ADC and may be sent to a processor that may be adapted to perform digital signal processing operations. The audio DAC may receive from the processor digital audio and polyphonic ringer data and may process the digital audio and polyphonic ringer data through separate digital filters and digital interpolators. The audio DAC may add the processed digital audio and polyphonic ringer data before analog conversion. The audio DAC may perform analog conversion by utilizing a delta-sigma demodulator, a current-based DAC, and a switched-capacitor filter. The converted data may be filtered with an RC filter and may be utilized to drive an external speaker or earpiece.

Method and apparatus for detecting far end speech in a telephone apparatus. A speaker (14) produces far end sound from a far end signal, when received by the telephone apparatus. A microphone (12) generates a near end signal from near end sound, for transmission from the telephone apparatus. A hybrid (24) which passes the near and far end signals from an external two wire link (30) to and from the speaker and microphone, on respective first and second paths (1, 2) of a four wire link (28). Muting of the near end signal is effected when signal derived from the first path (1) of the four wire link (28) is detected as being representative of a condition of existence of far end signal. Signal determined as representing sidetone signal deriving from the near end signal from the speaker (14), and appearing in the signal on the first path (1) of the four wire link (28), pursuant to traverse of part of the near end signal through the hybrid, is subtracted from the signal derived from the first path (1) of the four wire link (28). Existence of the condition of existence of far end signal is then determined on the basis of the result of the subtraction.

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.

A wireless telephone includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is also provided proximate the speaker to provide an error signal indicative of the effectiveness of the noise cancellation. A secondary path estimating adaptive filter is used to estimate the electro-acoustical path from the noise canceling circuit through the transducer so that source audio can be removed from the error signal. Sidetone is injected into the transducer output, but is not provided to the coefficient control of the secondary path estimating adaptive filter, so that the ambient noise present in the near-end speech microphone signal, and thus present in the sidetone information, does not destabilize the ANC circuit or otherwise cause improper generation of the anti-noise signal.

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.

A headset is able to be coupled via a cable to an intercom system, is able to be wirelessly coupled to a wireless device via a wireless transceiver of the headset, and is able to be connected to a wired device via another cable. A controller of the headset separately monitors the microphone conductors and audio conductors by which the headset may be coupled to the intercom system to detect whether or not one or both of a communications microphone and an acoustic driver of the headset are coupled to the intercom system, and monitors the operating state of the wireless transceiver to detect whether or not the wireless transceiver is inactive, on standby or in use; ; and selectively couples a system ground conductor to one of the microphone conductors, selectively provides a local sidetone, and/or selectively provides a local microphone bias voltage in response to what is observed through such monitoring.

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 invention discloses a method and a device for realizing a hearing aid function at a mobile terminal. The mobile terminal comprises a center processor unit, a sidetone audio frequency amplifier, a voice audio frequency amplifier and a codec. The realizing method comprises the following steps: 1. a parameter setting unit responses to an input setting operation and generates a corresponding setup parameter according to the input setting operation; 2. the center processor unit sets a corresponding hearing aid parameter for the sidetone audio frequency amplifier and the voice audio frequency amplifier according to the setup parameter in the step 1 and switches an audio frequency channel to an earphone channel; 3. the sidetone audio frequency amplifier and the voice audio frequency amplifier process the exterior voice according to the hearing aid parameter under the control of the center processor unit and then the center processor unit sends the processed exterior voice to an earphone by the earphone channel. The realizing device comprises the center processor unit, the sidetone audio frequency amplifier, the voice audio frequency amplifier, the parameter setting unit and the earphone. The method and the device of the invention realize the hearing aid function at the mobile terminal.

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.

A headset is able to be coupled via a cable to an intercom system, is able to be wirelessly coupled to a wireless device via a wireless transceiver of the headset, and is able to be connected to a wired device via another cable. A controller of the headset separately monitors the microphone conductors and audio conductors by which the headset may be coupled to the intercom system to detect whether or not one or both of a communications microphone and an acoustic driver of the headset are coupled to the intercom system, and monitors the operating state of the wireless transceiver to detect whether or not the wireless transceiver is inactive, on standby or in use; ; and selectively couples a system ground conductor to one of the microphone conductors, selectively provides a local sidetone, and/or selectively provides a local microphone bias voltage in response to what is observed through such monitoring.

The invention provides a method and a device for generating X-frequency band one-way ranging signals for deep space exploration. The method provided by the invention can generate one-way ranging sidetone signals in the X-frequency band. The device provided by the invention comprises simulation devices such as a crystal oscillator, a frequency divider, a low-pass filter, a frequency multiplier, a phase shifter and the like, and turn-off of DOR (Differential One-way Ranging) sidetone signals can be controlled through an instruction. The crystal oscillator generates initial reference signals, one path of the initial reference signals are inputted into the frequency multiplier after power division, the frequency multiplier generates X-frequency band carriers, another path of the initial reference signals are inputted into a divide-by-two frequency divider, a left path of the initial reference signals are inputted into a divide-by-ten frequency divider, and two paths of DOR sidetone signals are generated respectively. Phase modulation is carried out on the two paths of DOR sidetone signals in the X-frequency band, and the two paths of DOR sidetone signals are outputted after being amplified and isolated. Divide-by-two frequency division and divide-by-ten frequency division are completed by a decimal counter. The X-frequency band one-way ranging signals generated by using the method provided by the invention can complete a function of accurate ranging for a deep space probe by being matched with relevant ground station equipment, thereby being applicable to the fields of lunar exploration, Mars exploration and the like.

The invention discloses an anti-sidetone circuit of an intercom system isolation transformer. The anti-sidetone circuit is characterized by comprising a first level microphone signal amplification circuit, an audio transformer, a subtractor, a direct current bias circuit and a second level noise compression amplification circuit, wherein a microphone input signal is transmitted to the audio transformer through the first level microphone signal amplification circuit; input signals of the subtractor are obtained from two different sampling points V1 and V2 in the first level microphone signal amplification circuit, and the signals of the two different sampling points V1 and V2 are respectively transmitted to an inverting terminal and a noninverting terminal of the subtractor, after the signals are processed by the subtractor, then the signals are transmitted to the second level noise compression amplification circuit, and attenuation eliminating treatment is performed on a local sidetone signal. By adopting such design, a driver transformer of an analog audio intercom system can be improved optimally, sidetones can be eliminated under full-duplex intercom, and multiple devices can be cascaded and independent mutually.

The utility model discloses a sidetone extraction module, which comprises a phase-locked loop and a digital frequency synthesizer, wherein the phase-locked loop is used for receiving and tracking a sine distance measuring tone signal which is received by a satellite, and obtaining and outputting the frequency and phase of the sine distance measuring tone signal, and the digital frequency synthesizer is connected with the output end of the phase-locked loop through a circuit, and is used for regenerating and outputting the sine distance measuring tone signal according to the outputted frequency and phase of the phase-locked loop. The sidetone extraction module has the advantages that a digital Costas loop with narrow loop bandwidth, small loop noise and high tracking accuracy is used for tracking the sine distance measuring tone signal generated by a ground station to obtain the frequency and phase of the sine distance measuring tone signal, and then the sine distance measuring tone signal is duplicated by the digital frequency synthesizer, and is sent to a downlink link modulator to modulate the phase of a downlink carrier, so the stability is high, the resource consumption is decreased, the system complexity is decreased, and the resource consumption is further decreased; the tracking bandwidth is small, the tracking accuracy is higher, and the high-accuracy forwarding of the distance measuring signal is realized.

The invention discloses a transmission duplex interface circuit suitable for a compound impedance medium, comprising an output power amplifier (1), an impedance matching network module, a balance network module, a cancellation network module, an output interface circuit and an input power amplifier (6). The transmission duplex interface circuit suitable for the compound impedance medium is characterized in that the impedance matching network module comprises a transformer, and the cancellation network module comprises two butted transformers. The transmission duplex interface circuit is particularly suitable for application to transmission media with extremely complicated load impedance characteristics and variance, can realize cancellation in a wideband range and overcomes the defects ofa bridge-type anti-sidetone technology.

Techniques for measuring a one way delay between two handsets over an Internet protocol (IP) network utilize a delay measurement subsystem connected to both handsets and a procedure to couple a test signal to both handsets and measure the response to the test signal. The delay measurement subsystem is connected to a call originating handset to play an acoustic test signal to the transmitter of the originating handset. The delay measurement subsystem is connected to a call terminating handset to play the acoustic test signal to the transmitter of the call terminating handset and to record acoustic signals received on the call terminating handset. Signals recorded at the call terminating handset include a sidetone signal and a signal received from the call originating handset. The difference between the sidetone signal and the signal received from the call originating handset represents the delay through the handsets and the IP network.

A filter (45) is passive and has a complex impedance which gives good impedance matching to the complex impedance of a transmission line. Because the filter is passive, it does not need to be powered and can thus be placed in locations that lack a power supply. The filter can also function in the event of a power failure. Because the filter has an impedance which can be well matched to the complex impedance of a transmission line, problems relating to echo and side tones can be minimized.

The invention belongs to the test technique, provides an ultrashort wave digital radio test system. The system comprises a personal computer 1, a power meter 4, an integrated tester 5, a probe 6 and a digital voltmeter 9. When testing the transmitting state signals of a radio, the integrated tester 5 generates radio audio input 14; the radio modulates the radio audio input 14 into radio frequency signals; antenna signals 13 are generated through an antenna interface; the antenna signals 13 pass by the probe 6 and enter the integrated tester 5 for radio frequency signal analysis; the digital voltmeter measures the sidetone level when the radio transmits; when testing the receiving state signals of the radio, the integrated tester 5 generates radio frequency signals 12; the signals are converted into wireless signals 13 by the power meter and the probe; the wireless signals enter the radio; the radio demodulates the audio signals in the radio frequency signals; the demodulated radio audio output 16 is sent to the integrated tester 5 for analysis; and the digital voltmeter measures the amplitude. The system provided by the invention replaces the traditional manual test mode; and the test time is clearly reduced.