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| Number | Title | Issue Date |
| 7333603 | System and method for adapting an analog echo canceller in a transceiver front end There is disclosed an echo canceller circuit for use in a full duplex transceiver of the type comprising a line driver capable of sending analog transmit signals through a cable and comprising a line receiver capable of receiving analog receive signals from the cabl... | 02/19/2008 |
| 7330739 | Method and apparatus for providing a sidetone in a wireless communication device A wireless communication device is disclosed that provides a sidetone to the device user. The device converts an outbound analog audio signal to an outbound audio bitstream from which a sidetone bitstream is extracted. The device also converts an inbound digital aud... | 02/12/2008 |
| 7327298 | Gigabit ethernet line driver and hybrid architecture A gigabit ethernet line driver includes a transmitter having both transmitter and active hybrid outputs. The transmitter consists of a plurality of transmitter clusters each connected to both the transmitter and active hybrid outputs. Each transmitter cluster includ... | 02/05/2008 |
| 7304961 | Echo cancellation device for full duplex communication systems An echo cancellation device for a full duplex communications system is provided. The full duplex communication system has a transmitter for transmitting a transmit signal and a receiver for receiving a receive signal. The echo cancellation device has a filter for ou... | 12/04/2007 |
| 7295976 | Voice activity detector for telephone 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 voice activity. In accordance with another aspect of the invention, the ... | 11/13/2007 |
| 7260209 | Methods and apparatus for improving voice quality in an environment with noise A method for improving a downlink signal received by a listener on a phone is disclosed. The method includes calculating an environment noise level of the listener and filtering and adjusting gain of the downlink signal based on the environment noise level. ... | 08/21/2007 |
| 7254198 | Receiver system having analog pre-filter and digital equalizer A receiver system suitable for a local area network contains an analog pre-filter (207 or 619), an analog-to-digital converter (210), a digital equalizer (212), and a decoder (605). A symbol-information-carrying input analog signal... | 08/07/2007 |
| 7227906 | Radio communication method and apparatus for multiplex transmission of plural signals in the same frequency band Different carrier frequencies are chosen for plural transmitters of a transmitting device and signals are transmitted at frequency bands overlapping each other. In the receiving device weighting coefficients are provided in input-to-output paths of an interchannel i... | 06/05/2007 |
| 7224794 | Transmitting message playback concurrent with speakerphone operation A digital telephone answering device having speakerphone capability allows a recorded message to be played back and heard by the far-end party as well as over the local speakerphone by the near-end party during speakerphone operation as if it were a normal receive s... | 05/29/2007 |
| 7181297 | System and method for delivering customized audio data A method for providing customized audio data products that includes the steps of (1) storing a machine readable hearing profile for a customer, (2) accepting via a data input device or data network for example, machine readable orders from the customer for a particu... | 02/20/2007 |
| 7149305 | Combined sidetone and hybrid balance 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 dev... | 12/12/2006 |
| 7146012 | Audio processing arrangement with multiple sources In an audio processing arrangement (2) input signals from a plurality of input sources (4,6) are weighted by weighting factors x and y using weighting elements (10, 12). The weighted input signals are combined to a combined signal by an adder ( | 12/05/2006 |
| 7072464 | Network communication device and hybrid circuit thereof A network communication device and hybrid circuit thereof. The hybrid circuit includes a first transformer, a second transformer and a protector electrically connected between the primary winding of the first transformer and the primary winding of the second transfo... | 07/04/2006 |
| 7061877 | System and method for providing high speed wireless media access A system and method for providing high speed wireless media access is disclosed. A local transceiver is provided, which is capable of transmitting data via a transmit path while receiving a feedback signal via a receive path. The local transmitter is connected to a ... | 06/13/2006 |
| 7050574 | Telephone line interface circuit and method A hybrid circuit is disclosed for effectively communicating information over a telecommunications line to which a transmitter and receiver are connected. The hybrid circuit is configured as a filter for filtering at the receiver input signals at predetermined freque... | 05/23/2006 |
| 7050971 | Speech recognition apparatus having multiple audio inputs to cancel background noise from input speech A speech recognition apparatus including an audio cancellation module is disclosed. The module includes an audio input for receiving an audio signal from a microphone. The module also includes at least two audio inputs for receiving audio signals from respective ind... | 05/23/2006 |
| 7027562 | System and method to reduce echoes in voice communications A system and method to reduce echoes in voice communications are described. Input data containing return loss values of a communication trunk within a communications network is received, the return loss values being measured at each frequency of a plurality of frequ... | 04/11/2006 |
| 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 predetermined ambient noise to voice volume relationship. Voice volum... | 04/04/2006 |
| 7020277 | DSL line interface having low-pass filter characteristic with reduced external components A line interface couples a data transceiver to a transmission line via a transformer, the data transceiver transmitting signals in a first frequency range and receiving signals in a second frequency range. The line interface includes an input port for receiving an i... | 03/28/2006 |
| 7003096 | Full duplex telephone set using echo cancellation and side tone management for high gain stability A full duplex telephone set for hearing impaired users includes a digital signal processor incorporating a pair of adaptive transversal filters to cancel line and acoustic echo feedback from the tip and ring signals of the set, and to condition and control the amoun... | 02/21/2006 |
| 6993125 | Variable sidetone system for reducing amplitude induced distortion The variable sidetone system provides an enhanced method for inducing the subscriber maintain the amplitude of their voice at an appropriate level by exaggerating the amplitude characteristics of the sidetone returned to the subscriber. Rather than have the sidetone... | 01/31/2006 |
| 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 |
| 6980644 | System and method for adapting an analog echo canceller in a transceiver front end There is disclosed an echo canceller circuit for use in a full duplex transceiver of the type comprising a line driver capable of sending analog transmit signals through a cable and comprising a line receiver capable of receiving analog receive signals from the cabl... | 12/27/2005 |
| 6968064 | Adaptive thresholds in acoustic echo canceller for use during double talk Disclosed is an apparatus for cancelling far endpoint echo signals in audio signals transmitted from a near endpoint to a far endpoint. In one embodiment, the apparatus includes a near endpoint analysis filter bank operable to divide a near endpoint signal into a pl... | 11/22/2005 |
| 6940987 | Techniques for improving audio clarity and intelligibility at reduced bit rates over a digital network In accordance with an embodiment of the present invention, a dynamics processor includes a non-linear automatic gain control (AGC) responsive to an input audio signal comprised of a plurality of frequency components, each frequency component having associated therew... | 09/06/2005 |
| 6925172 | Line interface with gain feedback coupled matching impedance A transceiver system is disclosed for use in a telecommunication system. The transceiver system includes a transmission circuit including a transmitter input coupled to an input of a transmission amplifier, a receiver circuit including a receiver output coupled to a... | 08/02/2005 |
| 6870928 | Line interface, apparatus and method for coupling transceiver and transmission line A line interface couples signals between a data transceiver and a transmission line having a load impedance Z. The line interface includes a transformer, a driver circuit for supplying a transmit signal from the data transceiver to the transformer, and a receiver ci... | 03/22/2005 |
| 6850617 | Telephone receiver circuit with dynamic sidetone signal generator controlled by voice activity detection 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 ... | 02/01/2005 |
| 6842517 | Meter pulse filtering circuit for analog modems A filtering circuit is described for filtering out meter pulses of analog telephone communication, for example in analog modems. The circuit is mainly composed of resistors and capacitors and is configured as a double T element or a Wien bridge circuit. The filterin... | 01/11/2005 |
| 6836544 | Sidestone reduction in full duplex transceivers A method and apparatus enables echo reduction in a full duplex transceiver system. A replica current is subtracted from a receiver via a first differential circuit path that adaptively matches a time constant associated with a second differential circuit path that c... | 12/28/2004 |
| 6819761 | Programmable constant current “off hook” circuit An apparatus and method for interfacing a communication device, such as a Customer Premise Equipment (CPE) to different telephone networks. The telephone networks typically provide a voltage of 48 volts to the CPE. However, this DC voltage tends to fluctuate. Furthe... | 11/16/2004 |
| 6801623 | Software configurable sidetone for computer telephony Techniques for software configurable sidetone are provided. A user can select one or more characteristics of the sidetone and the sidetone signal will be generated according to an input signal and the user selected characteristic or characteristics. A bipartite calc... | 10/05/2004 |
| 6792104 | Transformer-coupled matching impedance A system for matching impedance in the circuitry of an xDSL communication device to improve noise cancellation resulting from signal leakage between transmit and receive signals. The system for matching impedance includes a transformer configured to couple an impeda... | 09/14/2004 |
| 6768795 | Side-tone control within a telecommunication instrument A side-tone control unit for a telecommunication instrument is configured to include a side-tone amplifier having a transfer function selectively controlled in accordance with a set of amplifier parameters, and a side-tone controller, coupled to the side-tone amplif... | 07/27/2004 |
| 6741700 | Low insertion loss current sense circuit A current sense circuit for sensing a current in a subscriber loop comprising a transformer having a first and second winding coupled for sensing a differential current in a loop, a sense winding for producing a sense current in response to a magnetic flux induced i... | 05/25/2004 |
| 6711259 | Method and apparatus for noise suppression and side-tone generation An audio processing module, in accordance with the invention, includes an input for receiving input signals. A side tone generator is included for receiving the input signals and for generating a side tone to be output. A noise suppressor is coupled to the input for... | 03/23/2004 |
| 6704414 | Telephone line extension A system comprising a base unit and a remote unit for transmitting telephonic data on AC power lines is disclosed. The base unit includes a transmitter section, a receiver section, a power line interface, a telephone line interface, a power supply, and a ... | 03/09/2004 |
| 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 reference signal, which contains unwanted noise and wanted voi... | 03/02/2004 |
| 6661892 | Method and apparatus for decreasing distortion in a line powered modulator circuit A method and apparatus for a telephone line interface or data access arrangement (DAA) which includes a shunt regulator in series with a line modulator. A first sense resistor is placed in series between the shunt regulator and the line modulator to provi... | 12/09/2003 |
| 6628779 | Method and system for scaleable near-end speech cancellation for tip and ring tone signal detectors A method and system for providing suppression of near-end speech energy for tone signal detectors. In accordance with the invention a system or device is connected between the tip and ring on a subscriber loop, the subscriber loop being connected to offic... | 09/30/2003 |
