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| Number | Title | Issue Date |
| 8050398 | Adaptive conferencing pod sidetone compensator connecting to a telephonic device having intermittent sidetone Disclosed herein are teleconferencing pods that include a microphone and a loudspeaker for open-air conversations, connectible to a separate telephonic device that generates an intermittent sidetone that is active at certain times not in the control or monitoring of... | 11/01/2011 |
| 7706525 | Systems and methods for side-tone noise suppression A side-tone circuit comprises a microphone configured to generate a reverse link audio signal and a side-tone noise suppressor. The side tone noise suppressor is configured to receive the reverse link audio signal, suppress noise in the received reverse link audio s... | 04/27/2010 |
| 7362730 | Apparatus, and associated method, for facilitating routing of data in a radio communication system having a mobile node capable of roaming movement Apparatus, and an associated method, for providing routing information to a mobile node operable in a radio communication system. The routing information is used by the mobile node to address data messages that are to be communicated to a relay host, or other, devic... | 04/22/2008 |
| 7310420 | Telephone headset amplifier with noise blanking capability The present invention is directed most particularly to wireless communication systems for interconnection with telephone systems, and more particularly to methods and apparatus to suppress unwanted and annoying audio spikes or bursts that infiltrate the wireless sys... | 12/18/2007 |
| 7233659 | 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... | 06/19/2007 |
| 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 |
| 7190769 | Apparatus for controlling operation of a recording device with a telephone instrument An apparatus for controlling operation of a recording device with a telephone configured for orientation in a first state and a second state includes: (a) an information conveying section for conveying information from the telephone to a recording locus in the recor... | 03/13/2007 |
| 7181027 | Noise suppression in communications systems A communications system contains a network linking a number of communications devices participating in a communications session. During the communications session, the communications devices share information indicating when participants are speaking. Based on this ... | 02/20/2007 |
| 7120438 | System and method for assigning a network address to a wireless device A system for assigning a network address to a wireless device includes a network server, a virtual device manager, and an address resolution (AR) module. In one embodiment, the system is operable to push information from an information source within a computer netwo... | 10/10/2006 |
| 7079852 | Method and device for improving audio quality in a mobile radio network A method and a device for improving audio quality in a mobile radio network that enables audio quality to be improved in mobile radio networks independently from the terminal(s) includes an equalizer connected to the audio path assigned to be the communication link,... | 07/18/2006 |
| 7068780 | Hybrid echo canceller Systems and methods for reducing transmit echo in a transceiver are disclosed. A hybrid echo canceller includes a limited tap length FIR filter to cancel short-term echo, while an interpolated filter is used to cancel the long-tail echo. The limited tap length FIR f... | 06/27/2006 |
| 7065339 | Method and system enabling prepaid service in an All-IP network The invention relates to a system and method for enabling prepaid service in a packet-based communications system, in particular in an All-IP network which comprises one or more subscriber terminals. At least one subscriber database stores subscriber information inc... | 06/20/2006 |
| 7058642 | Method and data structure for a low memory overhead database Method and data structure for a low memory overhead database and apparatus for implementing the same. Under one embodiment, the data structure includes an index table for storing a plurality of entries, each of the entries corresponding to one of a plurality of hash... | 06/06/2006 |
| 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 communication terminal, and a speaker signal is supplied to a first speaker to... | 05/30/2006 |
| 7031454 | Method and apparatus for interfacing telephone apparatus to a digital, analog or hybrid telephone switching system An adaptive interface method and apparatus for interfacing a telephony appliance such as an analog telephone, modem, fax modem, facsimile machine teleconferencing device, headset, VoIP telephone or non-compatible digital telephone to a digital, analog or hybrid tele... | 04/18/2006 |
| 7027537 | Iterative multi-user detection Methods and mechanisms for reducing the impact of cross talk interference in multi-carrier data transmission systems are disclosed. In one aspect, the invention relates to a method of canceling cross talk interference in a received data signal. The method includes r... | 04/11/2006 |
| 6999560 | Method and apparatus for testing echo canceller performance A test system measures performance of telephone network echo cancellers using a primary criterion of estimated user annoyance due to audible returned echo. The invention generates live telephone calls, uses real speech samples as stimulus signals and provides tail-c... | 02/14/2006 |
| 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 |
| 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 |
| 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 |
| 6934383 | Apparatus for reducing echoes and noises in telephone An apparatus for reducing echoes which are generated due to signals induced to a handset connector in a telephone, includes a round-type handset connector cord arranged into a round configuration having a certain arrangement of the speech transmitting and receiving ... | 08/23/2005 |
| 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 |
| 6834108 | Method for improving acoustic noise attenuation in hand-free devices The present invention relates to a method for improving acoustic noise attenuation, in which the method includes an adaptive control for partial-band echo compensation as well as global-band post-filtering for suppressing residual echo in hand-free devices. This met... | 12/21/2004 |
| 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 |
| 6731748 | Audio interface for satellite user terminals An apparatus, system, and method for providing an audio interface between multiple deskset phones and a single radio antenna unit (RAU). The audio interface includes a transmit path and a receive path. The transmit path carries transmit signals from the multiple des... | 05/04/2004 |
| 6728367 | Apparatus and method for filtering voiceband and metering tone frequencies of a mixed voice/data signal An apparatus and method provide for filtering of voiceband and specified tone frequencies of a mixed voice/data signal, such as an Asymmetric Digital Subscriber Line (ADSL) signal. A lowpass filter section passes voiceband content of the mixed signal and suppresses ... | 04/27/2004 |
| 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 |
| 6587504 | Adaptive equalizer and designing method thereof Following arrangement of an adaptive equalizer with a direct filter structure according to the least mean square error architecture, look ahead conversion of modifying a tap coefficient of the next cycle utilizing the tap coefficient of a predetermined pr... | 07/01/2003 |
| 6539091 | Apparatus for sidetone damping An apparatus for sidetone damping can be used in telephones configured for hands-free operation. The apparatus has a reception branch with a speaker and a transmission branch with a microphone. An adaptive echo compensator is provided for compensating for... | 03/25/2003 |
| 6445791 | System and methods for modem interface An interface for coupling a modem port with a transmission line includes a hybrid converter having a variable gain amplifier coupling a transmit path of a first differential polarity and a received path of a second differential polarity.... | 09/03/2002 |
| 6320923 | BWR jet pump wedge keeper A locking device for use in restraining a jet pump downcomer of a nuclear reactor, including an upper jaw; a lower jaw placed in an opposing position below the upper jaw; and a tightening screw movably supporting the upper jaw and the lower jaw. When inst... | 11/20/2001 |
| 6304654 | Telephone handset interface with feedback control A telephone handset interface reduces or eliminates feedback induced singing in a telephone handset/hybrid loop. The interface provides for user selectable volume control settings, each setting representing an amount of gain or loss to be applied to the t... | 10/16/2001 |
| 6212273 | Full-duplex speakerphone circuit including a control interface A full-duplex communication device includes a transmit channel, a receive channel, and echo cancellers connected between the transmit channel and the receive channel. A plurality of control parameters and status indicators are defined for both channels. T... | 04/03/2001 |
| 5982880 | Method and apparatus for canceling tone signal noise generated when using a speakerphone in a digital key telephone apparatus A technique for eliminating tone signal noise generated using a speakerphone, in which the communication path of a microphone is interrupted when a key is pressed, and then the communication path of the microphone is linked only after a constant time peri... | 11/09/1999 |
| 5943407 | Performance enhancement of tone detection and FSK detection using hybrid echo cancellation Type 2 caller ID/call waiting (CIDCW) customer premises equipment (CPE) is provided which has a greatly improved method of detecting tones indicating the availability of call information regarding an incoming call while the customer premises equipment is ... | 08/24/1999 |
| 5940499 | Voice switch used in hands-free communications system A voice switch in a hands-free communications system performs selective attenuation with respect to respective voice signals being transmitted and received in respective transmitting and receiving paths, the transmitted voice signal having been converted ... | 08/17/1999 |
