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Match Document Document Title
7181000 Voice transmission device and voice transmission system  
A voice transmission device has a tandem pass through function in an STM, ATM, IP network, and a noise canceller ( 21 ) is provided at a latter stage of an echo canceller ( 12 ) in a coding part,...
7123714 Speakerphone having improved outbound audio quality  
A telephone ( 310 ) and a method for providing outbound audio when the telephone is operating in a speakerphone mode. A first data unit ( 350 ) including a first unit type identifier ( 360 ) can be...
7054436 Communication terminals with a dual use speaker for sensing background noise and generating sound, and related methods and computer program products  
Communication terminals, methods, and computer program products are provided that sense background noise via a speaker that is also used to generate sounds. In some methods of operating a...
7023984 Automatic volume adjustment of voice transmitted over a communication device  
A system and method for adjusting the volume level of a communications device in response to a voice volume/ambient noise relationship. Ambient noise and voice volume are sampled and compared to a...
6990193 Method of acoustic echo cancellation in full-duplex hands free audio conferencing with spatial directivity  
A method is set forth of controlling an acoustic echo canceller at the output of a beamformer in an audio conferencing device. Information is saved to, and retrieved from, memory that characterizes...
6950511 Detection of both voice and tones using Goertzel filters  
A plurality of Goertzel filters whose operating frequencies are distributed across the voice baseband are used to detect voice and control tones in a signal. Filters operating at frequencies of...
6947773 Method and apparatus for reducing echo feedback in a communication system  
A method and apparatus for reducing echo feedback in a wireless communication system ( 10 ) is accomplished when a receiving communication unit ( 24 ) senses a feedback signal, or echo, via an...
6937718 Method and apparatus for personalized conference and hands-free telephony using audio beaming  
The present invention is directed to the provision of a personalized speaker phone and hands-free telephony. In particular, the present invention allows communications to be output along a narrowly...
6839320 Performing authentication over label distribution protocol (LDP) signaling channels  
To perform end-to-end authentication between a customer premises network termination (CPNT 1 ) of a user and a network access server (NAS 1 ) of a service provider at set-up of a label switched...
6754337 Telephone having four VAD circuits  
Voice activity is detected by comparing a signal with two thresholds and producing data representing the energy of the signal. The data, in binary form, is compared with thresholds to determine...
6707910 Detection of the speech activity of a source  
The scope of the present invention is a device for detecting the source of a voice, which device comprises microphone means ( 2; 2 a, 2 b, 2 M) for receiving a voice signal and detecting means...
6700976 Noise canceler system with adaptive cross-talk filters  
A known cross-talk adaptive noise cancellation apparatus uses two adaptive filters for suppressing the correlated noise in the main signal, which contains wanted voice and unwanted noise, by a...
6564072 Radio telecommunication terminal  
The invention relates to a mobile radio terminal including an audio transducer ( 5 ) an outlet ( 6 ) of which is oriented towards the front face of the terminal and provides earpiece, loudspeaker...
6473629 Method of displaying alternating transmitting and receiving phases of voice communication in a mobile phone in a speakerphone mode  
A method of displaying alternating transmitting and receiving phases of voice communication in a mobile phone with a display when it is operated in the speakerphone mode includes the steps of...
6381312 Acoustic communication terminal apparatus and recording medium for storing a control program therefor  
An acoustic communication terminal apparatus for performing data communication over a telephone line by using an acoustic coupler has an error number counter for counting the number of errors...
6363344 Speech communication apparatus and method for transmitting speech at a constant level with reduced noise  
An apparatus comprising a noise component removing means for removing specific noise components from input voice, and a level adjusting means for amplifying the voice signal after the removal of...
6353732 Method for automatically assisting unaided voice communication  
Automatic assistance to unaided voice communication is provided by activating and deactivating a wireless communication link as needed ( 300 ). A communication device, associated with a particular...
6223154 Using vocoded parameters in a staggered average to provide speakerphone operation based on enhanced speech activity thresholds  
A portable communication device (104), such as a cellular telephone, is operable in a speakerphone mode. The communication device uses a digital communication scheme, and both receives and...
6125288 Telecommunication apparatus capable of controlling audio output level in response to a background noise  
A method of detecting a noise level from audio signals produced consecutively in time by a microphone. The method includes the steps of evaluating an average level of the audio signals...
5768364 Software speakerphone system and method of operating a speakerphone  
In a speakerphone, which operates under software control, transmit and receive signal levels are sampled and compared against one another, with hysteresis, to enable one of two speakerphone modes...
5764753 Half-duplex controller  
A double-talk detector for an echo canceller includes power estimators (60) and (62) which are utilized to measure the ERLE value in a calculator (64). This ERLE is stored in a register (70) when...
5737407 Voice activity detector for half-duplex audio communication system  
A method of detecting voice in an audio signal comprises the steps of determining an average peak value representing an envelope of the audio signal, determining a running instance of audio signal...
5675641 Dual-mode speaker telephone  
An apparatus and method for operating a speaker telephone in either full-duplex mode or half-duplex mode. In the absence of an earphone connection, the speaker telephone operates in half-duplex...
5608794 Telephone headset in-use indicator  
An indicator lamp identifies the status of telephone calls both transmitted and received from a hands-free telephone headset. The indicator lamp is either automatically activated by a signal from a...
5586180 Method of automatic speech direction reversal and circuit configuration for implementing the method  
In a method and a circuit for automatic speech direction reversal a reception signal with variable damping is furnished to a loudspeaker and a signal with a variable damping from a microphone is...
5491695 Means and method of dial up bridging of network for high bandwidth digital communication  
A high bandwidth data loop employs a plurality of individual circuits of a telephone network using a dialing inverse multiplexer communications device. The dialing inverse multiplexer is capable of...
5479502 Speaking apparatus having handfree conversation function  
A speaking apparatus having a handfree conversation function, provided with an echo canceler which can cancel the echo caused by direct acoustic coupling between a speaker and a microphone...
5297198 Two-way voice communication methods and apparatus  
A speakerphone system has a speaker and microphone in a common acoustic environment and electrically preceded and succeeded, respectively, by receive and transmit sections and adapted,...
5297135 Method and apparatus for determining directionality of communication signals on a communication channel  
In a bidirectional communication channel, the method and apparatus for determining directionality of communication signals using digital techniques. A plurality of independent signals are derived...
5280522 Circuit for transmitting voice signals and dial pulses  
A signal transmission circuit of a telephone system comprises a photo-transistor with its emitter and collector connected to telephone network lines, respectively. First and second relays are...
5265154 Telephone controller apparatus  
Apparatus for enabling or disabling a selected telephone. A control signal having a unique predetermined frequency, which corresponds to a desired state of the selected telephone, is transmitted...
5239586 Voice recognition system used in telephone apparatus  
A voice recognition system comprises a handset and a hands-free microphone for generating an input audio signal, a high-pass filter for eliminating low frequency components from the signal from the...
5235637 Voice communication link interface  
An apparatus 10 controls the two-way communication between the microphone 12 and speaker 36 of a telephone headset and a telephone base. A transmit channel 15 includes an expander 18 that...
5199065 Method for automatic speech direction reversal, and circuit configuration for performing the method  
A method for automatic speech direction reversal includes supplying a reception signal with variable damping to a loudspeaker, outputting a microphone signal with variable damping from a microphone...
5048082 Voice direction recognition in a digital telephone station  
A method for controlling a voice-controlled voice direction recognition unit for a digital telephone station, which can be connected to termination units having different hybrid attenuations. The...
4945570 Method for terminating a telephone call by voice command  
A reliable method for terminating a telephone call is disclosed using a specific sequence of steps performed by the hands-free control system. The invention requires that the call terminating...
4903291 Automatic on-hook arrangement  
An automatic on-hook arrangement which includes a voice detecting circuit for detecting input voice from a micro-phone, a timer for measuring time in which the input voice from the micro-phone is...
4763349 Monitoring apparatus using telephone link  
Two-way telephone communication is established between a subscriber-dwelling and a remote station using the automatic dialer of existing security apparatus. A speaker and a microphone are placed in...
4731832 Process and apparatus for control of a hands-free telephone set operating in alternation between sending and receiving  
The invention concerns a process and an apparatus to initiate the reversal of an inverter controlling the placement of a so-called hands-free telephone set in a reception mode or a transmission...
4691348 Two way telephone communication system  
A two way telephone communication system includes a station having a signal transmitting channel for conveying a signal received at a microphone to another station, a signal receiving channel for...
4677661 Microprocessor controlled telephone unit  
A telephone unit having a plurality of lines which connect to a PBX and having a microprocessor which transmits and receives data over a digital line between telephone units associated in a group...
4400581 Incoming audio detection circuit for a speaker telephone  
In this incoming audio detection circuit for a speaker telephone, an impedance element is connected between the output of the microphone amplifier and the telephone line terminals. Speech signals...
4315103 Speech-controlled loudspeaker telephone station circuit  
A circuit arrangement for a speech-controlled loudspeaker telephone station incorporates a pair of operational amplifiers for receiving voltages proportional to the microphone voltage and the...
4225754 Loudspeaker telephone  
A loudspeaking telephone has a differential coupler (3) connecting a two-way two-wire telephone line (4) to separate transmission and reception channels (1 and 2 respectively) including...
4161624 Hands-free telephone with cascaded attenuators  
A hands-free telephone set has both transmit and receive channels open for the reception of signals, while still inhibiting feedback-singing. Two switched attenuators are provided in cascade in...
4115659 Electroacoustical telephone adapter  
A telephone adapter for hands-free telephony, adapted for use with a telephone handset having structure including an earpiece, comprising: a transmit signal path comprising, in series, a...
4052562 System for control of speech direction in duplex telephone circuits  
A system for control of speech direction in duplex telephone circuits (e.g. hands-free telephones), derives a switching control signal proportional to both the immediate transmit-channel signal...
4025728 Speaker telephone  
In this speaker telephone, the microphone and loudspeaker circuits both are connected directly to the telephone line, and both are normally disabled. Separate incoming and outgoing control circuits...
4012596 Telephone patch  
Electronic patch circuitry interconnects a wire telephone line with the base station transmitter and receiver of a simplex two-way radio communication system, for causing VOX-type operation with...
3660603 SPEECH-CONTROLLED BILATERAL AMPLIFIER  
A speech-controlled bidirectional amplifier that includes first and second transmission channels each with a control member controlled by speech signals derived at control points preceding the...
Matches 1 - 50 out of 57 1 2 >