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| Number | Title | Issue Date |
| 7433462 | Techniques for improving telephone audio quality Methods and apparatus are described for use with a near-end telephone. The near-end telephone is operable to generate an outgoing signal directed to a far-end telephone and to receive an incoming signal generated at least in part by the far-end telephone. A first si... | 10/07/2008 |
| 7362654 | System and a method for detecting the direction of arrival of a sound signal The disclosed invention is a highly reliable cost effective sound direction detection system. In the preferred embodiment of the invention the system comprises a device which includes two microphones set at a spread of at lease 5 cm from each other, a digital signal... | 04/22/2008 |
| 7343284 | Method and system for speech processing for enhancement and detection A method for discriminating noise from signal in a noise-contaminated signal involves decomposing a frame of samples of the signal into decorrelated components, and using a difference between probability distributions of the noise contributions and the signal contri... | 03/11/2008 |
| 7336780 | Differential signaling transmission circuit The application discloses driver circuits including a current source, a current sink, and a current steering circuit configured to provide current to a load. The current sink is configured to be controlled according to a regulated voltage. Signal generator circuits ... | 02/26/2008 |
| 7319770 | Method of processing an acoustic signal, and a hearing instrument A method of processing an acoustic input signal into an output signal in a hearing instrument includes converting the acoustic input signal into a converted input signal, and applying a gain to the converted input signal to obtain the output signal. According to the... | 01/15/2008 |
| 7293058 | Shared routing in a measurement system System and method for managing routing resources for a measurement task. The system includes a computer and one or more measurement devices. The legs of a route for routing signals in performing the measurement task are created by, for each respective leg: determini... | 11/06/2007 |
| 7239694 | Integrated circuit configurations and methods for providing functions for public telephones Circuit configurations designed for use with public telephones to provide standard telephone functions with higher reliability, lower cost, and lower packaging densities, include first and second channel means for providing both transmit and receive multiplexing con... | 07/03/2007 |
| 7187764 | Automatic speak-up indication for conference call attendees A conference call arrangement, conferencing device, conference unit and a method of managing conference calls. The conferencing device may be a speakerphone with a speak up indicator. Whenever a conference call attendee does not speak loudly enough for remote partic... | 03/06/2007 |
| 7177417 | Telephone handset with user-adjustable amplitude, default amplitude and automatic post-call amplitude reset The present invention is directed to a telecommunication device, usable with standard telecommunication equipment, that automatically resets one or more acoustic parameters to predetermined levels prior to the initiation of the next communication session. ... | 02/13/2007 |
| 7130413 | Microprocessor-controlled full-duplex speakerphone using automatic gain control A near full duplex portable handset speakerphone comprises: a microprocessor; a hands-free receive register connected to the microprocessor; a hands-free transmit register connected to the microprocessor; a ROM having a speakerphone operation algorithm, the ROM-conn... | 10/31/2006 |
| 7099463 | Method and apparatus for detecting a compatible phantom powered device using common mode signaling A method and an apparatus provide for determining whether a data terminal equipment (DTE) device represents a compatible device lacking an independent power supply and adapted to be powered using phantom power over a wired connection from a communications device suc... | 08/29/2006 |
| 7095846 | Half duplex device and signal processing method thereof A half duplex device and signal processing method thereof. First, a signal detection unit of a signal detector of a half duplex device obtains a short-term power and long-term power. Next, a data update unit of the signal detector sets a short-term power threshold a... | 08/22/2006 |
| 7054438 | Method and apparatus for active reduction of speakerphone singing In a speakerphone device identification of signals (i.e., voice input or speaker output) in a process for reducing acoustic feedback, in a communication device, is accomplished by adding a signature noise (i.e., an identification mark) to output signals radiated by ... | 05/30/2006 |
| 7046792 | Transmit/receive arbitrator The amplitudes of a signal on the microphone input of a telephone and a signal on the line input of the telephone are compared with each other and with two thresholds. The comparisons are sampled and the samples control an up-down counter. The count in the counter i... | 05/16/2006 |
| 7035395 | Digital communication system The present invention provides a digital communication system which is free from noise generated in a receiver. A transmitter converts an analog input signal to a digital signal, and then a power level detector 5 compares the digital signal with a predetermin... | 04/25/2006 |
| 7031458 | Method and apparatus for isolation in a data access arrangement using analog encoded pulse signaling The present invention is directed toward a method and apparatus for transferring data across an isolation barrier using high speed analog encoded signals. A line side circuit interfaces with tip and ring contacts on one side of a capacitive isolation barrier that is... | 04/18/2006 |
| 7006625 | Cordless telephone-to-sound card interface adapter with hybrid transformer and control circuit A cordless telephone-to-sound card interface adapter provides a connection between any standard cordless telephone system and a sound card of a computer for PC-to-PC or PC-to-telephone voice communications over the Internet. The interface adapter includes a hybrid t... | 02/28/2006 |
| 7003092 | Automated microphone switch controlled by a CTI combo An apparatus and method are disclosed for connecting a headset microphone alternately to a telephone line and an alternative device. The apparatus includes a device connector for connecting the apparatus to the alternative device, a telephone connector for connectin... | 02/21/2006 |
| 6993126 | Apparatus and method for detecting far end speech 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 tr... | 01/31/2006 |
| 6978009 | Microprocessor-controlled full-duplex speakerphone using automatic gain control A near full duplex portable handset speakerphone comprises: a microprocessor; a hands-free receive register connected to the microprocessor; a hands-free transmit register connected to the microprocessor; a ROM having a speakerphone operation algorithm, the ROM conn... | 12/20/2005 |
| 6973181 | Method of generating a ring signal in a subscriber line interface circuit technical field In a method and a device for controlling the magnitude of the generated ring signal in a the Subscriber Line Interface Circuit (SLIC) the voltage of the A and B lines to the subscriber from the SLIC is compared to a reference voltage. The device is arranged to contr... | 12/06/2005 |
| 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 control tones and detecting that most of the signal energy occurs at tho... | 09/27/2005 |
| 6940968 | Telephone terminal apparatus and method A telephone apparatus comprises a first audio input device, a second audio input device, a first audio output device, and a second audio output device. The telephone apparatus is operative to couple the first audio input device and the first audio output device to a... | 09/06/2005 |
| 6910447 | Pet communication apparatus A pet communication apparatus for allowing a user to communicate with a pet. The pet communication apparatus includes a housing member being designed for being selectively positioned on a support surface. A processing assembly is positioned in the housing member. Th... | 06/28/2005 |
| 6731752 | Method and circuit for echo-cancellation in two-way communications A hybrid circuit models a plurality of attributes of a communication system including a subscriber line coupled to a line interface circuit. The plurality of attributes includes subscriber line impedance, and impedance of a coupling transformer. The attributes are b... | 05/04/2004 |
| 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; 2a, 2b, 2M) for receiving a voice signal and detecting means for detecting the voice from the received voice s... | 03/16/2004 |
| 6691073 | Adaptive state space signal separation, discrimination and recovery This invention unifies a set of statistical signal processing, neuromorphic systems, and microelectronic implementation techniques for blind separation and recovery of mixed signals. A set of architectures, frameworks, algorithms, and devices for separati... | 02/10/2004 |
| 6690790 | Receiving section of a telephone with suppression of interference upon switching on/off A telephone receiving section having a final stage, an electroacoustic transducer having a first terminal connected to the ground of the circuit, a unit for controlling switching on/off, a source of a reference voltage, a switch that can adopt a first pos... | 02/10/2004 |
| 6683949 | Handset port interface including DC measurement and transmit path calibration A handset port interface including DC measurement and transmit path calibration. In an interface device for interfacing a telephone instrument, such as a headset, a handset, a modem, or a teleconferencing device, to the handset microphone input port of a ... | 01/27/2004 |
| 6535604 | Voice-switching device and method for multiple receivers A voice-switching device for use in a telephone terminal which applies an optimal amount of switched loss to a plurality of distinct receive transducers. The voice-switching device detects speech signals on the transmit and receive paths to determine a mo... | 03/18/2003 |
| 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 comparing the intensity of a received voice signal from a calle... | 10/29/2002 |
| 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 occurring during communication. With a control signal based on ... | 04/30/2002 |
| 5982755 | System and method for providing high terminal coupling loss in a handsfree terminal A method of increasing the terminal coupling loss in a digital half-duplex handsfree terminal is provided. When the terminal receive channel is active an idle code which is effectively zero is transmitted by an idle code generator. When the terminal trans... | 11/09/1999 |
| 5970137 | Loudspeaker gain correction for a hands-free telephone terminal A hands-free telephone terminal includes a loudspeaker (HP), a microphone (MI) and loudspeaker gain control means (AUG, DIM, PP). A loudspeaker gain correction method cyclically determines a listening comfort index to deduce gain modification parameters. ... | 10/19/1999 |
| 5857019 | Apparatus and method for providing a telephone user with control of the threshold volume at which the user's voice will take control of a half-duplex speakerphone conversation An improved speakerphone that may be viewed as a modification of a conventional half-duplex speakerphone that includes transmit and receive attenuators for alternatively isolating either a speaker or a microphone from a phone line. The attenuators are con... | 01/05/1999 |
| 5787165 | Handsfree radiotelephone having dynamic path attenuation control for echo suppression A speakerphone having echo suppression is provided. The speakerphone has an audio control system comprising a transmit path, a receive path, a pair of rectifiers for producing rectified signals indicative of the strength of the signals present on the rece... | 07/28/1998 |
| 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 of operation--either a transmit mode or a receive mode. A s... | 06/16/1998 |
| 5699423 | Telephone set in which an echo signal is effectively cancelled in spite of being provided with a plurality of sound producing units In a telephone set having a receiver (42) and a loudspeaker (39), a switch circuit (37) selects supply of a reception speech signal, transmitted from a counterpart section (60), to the receiver or the loudspeaker in response to a selection signal. A first... | 12/16/1997 |
| 5544242 | Speakerphone with event driven control circuit A control circuit for a speakerphone circuit which utilizes an event driven circuit to determine the appropriate gain for the receive and transmit channels is provided. Detectors monitor the relative magnitudes of the signal in the transmit and receive ch... | 08/06/1996 |
| 5535433 | Hands-free circuitry providing audio signal adjustment based on speaker volume value A hands-free circuitry in which, in order to prevent howling caused by acoustic coupling between a speaker and a microphone, a loss is inserted in a transmit audio path in a receive mode while a loss is inserted in a receive voice path in a transmit mode ... | 07/09/1996 |
