Sidetone Control Or Hybrid Circuit (e.g., Induction Coil) Patents (Class 379/391)
  • Patent number: 10468020
    Abstract: An example apparatus provides an input signal based on sound waves received by one or more microphones. The input signal includes a voice command component and one or more interference components. The apparatus receives audio data over one or more computer networks and the audio data corresponds to the one or more interference components. The apparatus uses the audio data to remove a portion of the one or more interference components from the input signal to generate an output signal, and provides the output signal, as an estimate of the voice command component, for speech recognition.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: November 5, 2019
    Assignee: Cypress Semiconductor Corporation
    Inventors: Ashutosh Pandey, Robert Zopf
  • Patent number: 10397706
    Abstract: A method for avoiding an offset of a membrane (3) of an electrodynamic acoustic transducer (1) having two voice coils (7, 8) is presented, wherein a control voltage (UCTRL) is applied to at least one of the voice coils (7, 8) until the electromotive force (Uemf1) of the first coil (7) or a parameter derived thereof and the electromotive force (Uemf2) of the second coil (8) or a parameter derived thereof substantially reach a predetermined relation. Furthermore, an electronic offset compensation circuit (12) is presented, which performs the above application of a control voltage (UCTRL). Finally, the invention relates to a transducer system with a transducer (1) and an electronic offset compensation circuit (12) connected to the transducer (1).
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: August 27, 2019
    Assignee: Sound Solutions International Co., Ltd.
    Inventor: Friedrich Reining
  • Patent number: 9847094
    Abstract: A voice processing device includes a first sound collecting unit for generating a first voice signal; a human-body vibration obtaining unit for generating a human-body vibration signal; a first distance calculating unit for calculating a ratio in power or amplitude between the human-body vibration signal and the first voice signal and for calculating a first distance from the first sound collecting unit to a sound source in accordance with the ratio and distance estimation information; a second distance calculating unit for calculating, for each of a plurality of frequencies, a second distance from the first sound collecting unit to a sound source which produces a component of a frequency of a first frequency signal; a gain determining unit for determining, for each of the plurality of frequencies, a gain based on a comparison result between the first distance and the second distance.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: December 19, 2017
    Assignee: FUJITSU LIMITED
    Inventor: Kaori Endo
  • Patent number: 9830899
    Abstract: Systems and methods for controlling adaptivity of noise cancellation are presented. One or more audio signals are received by one or more corresponding microphones. The one or more signals may be decomposed into frequency sub-bands. Noise cancellation consistent with identified adaptation constraints is performed on the one or more audio signals. The one or more audio signals may then be reconstructed from the frequency sub-bands and outputted via an output device.
    Type: Grant
    Filed: January 7, 2015
    Date of Patent: November 28, 2017
    Assignee: Knowles Electronics, LLC
    Inventors: Mark Every, Ludger Solbach, Carlo Murgia, Ye Jiang
  • Patent number: 9800205
    Abstract: A power amplifier circuit including a power transistor, a variable impedance circuit, first and second envelope detecting circuits is provided. The power transistor receives an input signal and outputs an output signal. The variable impedance circuit includes an impedance control transistor and a first filter capacitor. An equivalent impedance of the variable impedance circuit varies with the input signal. The impedance control transistor is coupled to the power transistor and receives a control voltage. The first filter capacitor is coupled between the impedance control transistor and ground. Both the first and the second envelope detecting circuits detect the input signal to dynamically control the equivalent impedance of the variable impedance circuit.
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: October 24, 2017
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Wei-Tsung Li, Shih-Ming Wang, Chih-Chun Shen
  • Patent number: 9800220
    Abstract: Generally, this disclosure provides systems, devices, methods and computer readable media for an audio device with noise interference mitigation capability. The audio device may include an interference detection module to detect an interfering voice audio signal received from an interfering audio source. The device may also include an interference identification module to identify the interfering audio source. The device may further include an impact estimation module to estimate an impact of the interfering voice audio signal on a user of the audio device and a communication module to transmit a volume correction request to the interfering audio source. The volume correction request may be based on the identification and the estimated impact. Other embodiments may be described and claimed.
    Type: Grant
    Filed: September 24, 2014
    Date of Patent: October 24, 2017
    Assignee: INTEL CORPORATION
    Inventor: Oleg Pogorelik
  • Patent number: 9763005
    Abstract: The present disclosure illustrates an acoustic echo cancellation method and system using the same. The acoustic echo cancellation method comprises the following steps. Firstly, a prior-knowledge matrix comprising a plurality of space vectors is built. Then, an initial filter vector is generated by the prior-knowledge matrix and an initial weighting vector. The weighting vector is updated based on the difference of the echo signal and the estimated signal in an iteration algorithm, and the coefficient of the filter vector is updated according to the updated weighting vector. An estimated signal is generated according to the updated filter vector and the original signal. Finally, the next echo signal is cancelled by the near-end estimated signal.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: September 12, 2017
    Assignee: YUAN ZE UNIVERSITY
    Inventors: Yu Tsao, Shih Hau Fang, Yao Shiao, Yu-Cheng Su, Ying-Ren Chien
  • Patent number: 9666209
    Abstract: Preventing unintended distribution of audio information may comprise analyzing audio data of a speaker's speech received by a microphone; determining automatically by a processor, from the analyzing whether the speaker's speech is intended to be distributed to an audience via the microphone; and in response to determining that the speaker's speech is not intended to be distributed to the audience via the microphone, performing one or more actions.
    Type: Grant
    Filed: August 14, 2013
    Date of Patent: May 30, 2017
    Assignee: International Business Machines Corporation
    Inventors: Sara H. Basson, Dimitri Kanevsky, Peter K. Malkin, Mark N. Wegman
  • Patent number: 9607630
    Abstract: Preventing unintended distribution of audio information may comprise analyzing audio data of a speaker's speech received by a microphone; determining automatically by a processor, from the analyzing whether the speaker's speech is intended to be distributed to an audience via the microphone; and in response to determining that the speaker's speech is not intended to be distributed to the audience via the microphone, performing one or more actions.
    Type: Grant
    Filed: April 16, 2013
    Date of Patent: March 28, 2017
    Assignee: International Business Machines Corporation
    Inventors: Sara H. Basson, Dimitri Kanevsky, Peter K. Malkin, Mark N. Wegman
  • Patent number: 9538299
    Abstract: In at least some embodiments, a computer system includes a processor and a network interface coupled to the processor. The computer system also includes a system memory coupled to the processor, the system memory storing a communication application having a conferencing user interface. The conferencing user interface, when executed, enables a user to set up a conferencing session by selecting one of a plurality of conferencing environment templates (CETs). Each CET is matched to one of a plurality of different sets of acoustic echo cancellation (AEC) parameters to be applied during the conferencing session.
    Type: Grant
    Filed: October 27, 2009
    Date of Patent: January 3, 2017
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Byron A. Alcorn, Majid Fozunbal
  • Patent number: 9531438
    Abstract: A power line carrier communication apparatus which prevents leakage of an electromagnetic wave and stably operates while employing a simplified configuration is provided. The power line carrier communication apparatus may include a transmission circuit which is connected to a power line and which transmits a signal to the power line; a reception circuit which is connected to the power line and which receives the signal from the power line; and an output suppression circuit which is connected to the power line and which, by connecting a signal attenuating element between the transmission circuit and a common only when the transmission circuit transmits the signal, suppresses an output of the signal transmitted from the transmission circuit.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: December 27, 2016
    Assignees: RiB Laboratory, Inc., HONDA MOTOR CO., LTD.
    Inventors: Setsuro Mori, Tsuyoshi Eguchi, Shohei Terada
  • Patent number: 9491306
    Abstract: Methods, systems, and apparatus for controlling audio signal processing are described herein. In accordance with certain embodiments, a measure of coupling between at least one microphone and one speaker associated with an audio device is obtained. The measure of coupling may be used to control audio signal processing, such as sidetone generation and application of multi-channel decorrelation to the audio signal.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: November 8, 2016
    Assignee: Broadcom Corporation
    Inventors: Taro Umezawa, Franck Beaucoup
  • Patent number: 9462552
    Abstract: Systems and methods for adaptive power control are provided. A minimum power level of a primary acoustic signal is estimated. The minimum power level may then be compared to at least one power threshold. Subsequently, a large power consuming system is controlled based on the comparison of the minimum power level to the power threshold.
    Type: Grant
    Filed: August 4, 2015
    Date of Patent: October 4, 2016
    Assignee: Knowles Electronics, LLC
    Inventors: Carlo Murgia, Alex Afshar, David Klein
  • Patent number: 8963695
    Abstract: A vibrator designed to be integrated into a portable electronic device as part of a haptic alert device has a linear electric motor that is coupled to actively drive a moveable weight in back-and-forth directions to produce the desired vibration. A lock mechanism has a restraining member that is biased into a lock position, which prevents the moveable weight from moving in the back-and-forth directions when the vibrator is inactive. Other embodiments are also described and claimed.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: February 24, 2015
    Assignee: Apple Inc.
    Inventors: Timothy M. Johnson, Yehonatan Perez, Sawyer I. Cohen, Ashutosh Y. Shukla
  • Patent number: 8762138
    Abstract: The present invention relates to a method as well as to a computing device (20) for editing a noise-database (13) containing noise information, said noise information being derived from noise signals within an audio stream (19). In order to enhance possibilities to create and utilize context information which emerge from tracking noise signals from an audio stream, for example a telephone call, the above method is characterized by the following steps: A) in a localizing step (14), determining geographical data of the location the noise signals origin from; B) in an analyzing step (15), analyzing the noise signals with reference to the noise content; C) in a linking step, linking the analyzed noise signals to said geographical data to create noise information; D) in a storing step, storing said noise information within said noise-database (13).
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: June 24, 2014
    Assignee: Vodafone Holding GmbH
    Inventors: Stefan Holtel, Jad Noueihed
  • Patent number: 8718273
    Abstract: An echo signal processing apparatus is disclosed. The echo signal processing apparatus is utilized for generating a cancellation signal by using group phenomenon of a frequency response of an echo signal to remove the echo signal. The echo signal processing apparatus has lower cost and is able to remove the echo efficiently.
    Type: Grant
    Filed: January 14, 2010
    Date of Patent: May 6, 2014
    Assignee: Realtek Semiconductor Corp.
    Inventors: Chih-Chi Wang, Rong-Jen Chang, Ting-Fa Yu, Li-Wei Fang
  • Patent number: 8682018
    Abstract: Microphone arrays (MAs) are described that position and vent microphones so that performance of a noise suppression system coupled to the microphone array is enhanced. The MA includes at least two physical microphones to receive acoustic signals. The physical microphones make use of a common rear vent (actual or virtual) that samples a common pressure source. The MA includes a physical directional microphone configuration and a virtual directional microphone configuration. By making the input to the rear vents of the microphones (actual or virtual) as similar as possible, the real-world filter to be modeled becomes much simpler to model using an adaptive filter.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: March 25, 2014
    Assignee: AliphCom
    Inventor: Gregory C. Burnett
  • Patent number: 8559619
    Abstract: The sidetone noise level in a wireless or wired telephone, for example, is reduced by adjusting both noise and signal levels and/or by improving the signal-to-noise ratio of such signals.
    Type: Grant
    Filed: June 7, 2002
    Date of Patent: October 15, 2013
    Assignee: Alcatel Lucent
    Inventor: Walter Etter
  • Patent number: 8386247
    Abstract: An adaptive audio system can be implemented in a communication device. The adaptive audio system can enhance voice in an audio signal received by the communication device to increase intelligibility of the voice. The audio system can adapt the audio enhancement based at least in part on levels of environmental content, such as noise, that are received by the communication device. For higher levels of environmental content, for example, the audio system might apply the audio enhancement more aggressively. Additionally, the adaptive audio system can detect substantially periodic content in the environmental content. The adaptive audio system can further adapt the audio enhancement responsive to the environmental content.
    Type: Grant
    Filed: June 18, 2012
    Date of Patent: February 26, 2013
    Assignee: DTS LLC
    Inventors: Jun Yang, Richard J. Oliver, James Tracey, Xing He
  • Patent number: 8368337
    Abstract: An HVAC unit includes a transformer and a system controller. The transformer is configured to receive power from a first and a second phase of a three-phase power source and to produce a first reduced-voltage waveform therefrom. The system controller is adapted to sample the reduced voltage waveform to determine a figure of merit of the three-phase power source. The controller is further configured to operate the HVAC unit in response to the figure of merit.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: February 5, 2013
    Assignee: Lennox Industries Inc.
    Inventors: Absalon Bonilla, Carlos O. Chamorro, Richard A. Mauk, John P. Stachler
  • Patent number: 8351597
    Abstract: The present invention relates to an electronic device that can output received voice and input transmitted voice at the same time and enhances a suppression function for echo due to the received voice sneaking into the transmitted voice. An electronic device (e.g., portable telephone terminal device) outputs the received voice from a voice output unit (speaker), inputs the transmitted voice through a voice input unit (microphone), and includes an echo canceller unit that subtracts a pseudo echo signal for the received voice from the transmitted voice to suppress an echo component in the transmitted voice and a controlling unit that changes an echo suppression amount of the echo canceller unit in accordance with the received voice volume.
    Type: Grant
    Filed: September 25, 2007
    Date of Patent: January 8, 2013
    Assignee: Fujitsu Limited
    Inventors: Yukihiro Sato, Nobuhiro Mochizuki
  • Patent number: 8325635
    Abstract: The present invention is related to methods and systems for reducing or canceling echoes during fax communications. In an embodiment, during a fax call, a first fax signal from a first fax device intended for a second fax device is detected. Based at least in part on detecting the first fax signal from the first fax device or on the termination of the first fax signal, an echo audio packet is muted, wherein the echo audio packet is at least partly the result of the first fax signal being transmitted over a network, the network including at least a data network.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: December 4, 2012
    Assignee: j2 Global Communications, Inc.
    Inventors: Robert Smith, Alan Erringer
  • Patent number: 8280450
    Abstract: Constant phone-call quality is kept irrespective of setting of a tone adjusting function of a cellular phone under connection. There is provided a sound collector for collecting voices and converting the voices to a voice signal, a communication unit for communicating with a cellular phone terminal according to a predetermined communication protocol, and a reproducing unit for reproducing the voice signal received in the communication unit.
    Type: Grant
    Filed: August 27, 2007
    Date of Patent: October 2, 2012
    Assignee: Clarion Co., Ltd.
    Inventors: Seiichi Suzuki, Kenji Yamauchi, Takashi Harada, Shoichi Akutsu, Hideyuki Aizawa
  • Patent number: 8229105
    Abstract: An enhanced sidetone system is disclosed which provides the user of a telecommunications terminal, while speaking, with immediate audio feedback that corresponds to what the far-end party is probably hearing. The sidetone system continuously samples the input speech signal from the user and also obtains signal quality statistics of the transmission path. These statistics can include descriptions of network quality-of-service characteristics (e.g., packet loss rate, etc.) and/or media quality characteristics (e.g., audio distortion due to echo cancellation, etc.). These statistics enable the disclosed technique to determine whether the transmitted signal quality is acceptable. When an unacceptable condition in transmit-path signal quality is detected, the technique modifies the traditional (main) sidetone signal.
    Type: Grant
    Filed: June 20, 2008
    Date of Patent: July 24, 2012
    Assignee: Avaya Inc.
    Inventor: Paul Roller Michaelis
  • Patent number: 8085945
    Abstract: In a communication machine room wideband noise suppression system, a sensing unit detects a noise source produced by a fan during the operation thereof and generates a noise input signal and a feedback signal, which are sent to a signal amplifying unit for signal amplification. The amplified signals are then sent to a signal converting unit and converted into digital signals. A multi-channel hybrid controller receives the digital signals and makes corrections and conduct rapid convergence algorithm to derive a reverse digital signal, which is sent to the signal converting unit and converted into a reverse analog signal. The reverse analog signal is sent to the signal amplifying unit for power amplification to generate a control signal for driving a loudspeaker unit to produce interfering acoustic wave, so as to cancel out the noise source and achieve the purpose of eliminating wideband noise.
    Type: Grant
    Filed: April 22, 2008
    Date of Patent: December 27, 2011
    Assignee: Asia Vital Components Co., Ltd.
    Inventors: Fu-Cheng Su, Yuan-Liang Liao, Jyh-Ren Lee, Yi-Hong Liao
  • Publication number: 20110051923
    Abstract: A method, device, and computer-readable storage medium for providing digital side tone are disclosed. These embodiments are directed toward processing digital side tone in a secondary processing unit external to a primary processing unit that includes the main digital signal processor, thereby reducing delay in producing side tone and freeing up processing resources in the primary processing unit. In an environment where the sampling rate of a digital-to-analog converter in the secondary processing unit is an integer multiple of the sampling rate of an analog-to-digital converter in the secondary processing unit, the components of the secondary processing unit are made to operate such that the digital side tone signal and the main tone signal are equal in sampling frequency and number of samples.
    Type: Application
    Filed: August 28, 2009
    Publication date: March 3, 2011
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Ramachandra ARAVIND BATNI
  • Patent number: 7881456
    Abstract: An audio system including an audio-enhancing station including at least one speaker and an audio-enhancing station docking connector, a music phone configured to play audio files and function as a wireless communication device separate from the audio-enhancing station, the music phone including at least one speaker to emit sound from the playing of the audio files, and a music phone docking connector that connects with the audio-enhancing station docking connector to dock the music phone with the audio-enhancing station, wherein the music phone and the audio-enhancing station together form an audio system where the at least one speaker of the music phone and the at least one speaker of the audio-enhancing station emit sound from the playing of the audio files on the music phone.
    Type: Grant
    Filed: September 13, 2006
    Date of Patent: February 1, 2011
    Assignee: Kyocera Corporation
    Inventors: Eva Russell, Frank Tyneski, Russell Paik, Leung Philip, Hosler Travis, Gant Evan
  • Patent number: 7734034
    Abstract: A system and method are provided for detecting acoustic echo in a telecommunications transmission. Detected acoustic echo is analyzed to determine if the acoustic echo includes characteristics indicative of use of a speakerphone by a remote party. Specific characteristics analyzed include the presence of multiple bulk delay values, echo magnitude, and the length of time for echo delays present within the telecommunications system. If the detected acoustic echo falls outside the range of acceptable parameters, or otherwise exceeds threshold limits, a warning signal is transmitted to the user indicating a high likelihood that the remote party is using a speakerphone. Warning the user of speakerphone use by the remote party can be helpful in ensuring that the communications between the parties is maintained in confidence.
    Type: Grant
    Filed: August 3, 2005
    Date of Patent: June 8, 2010
    Assignee: Avaya Inc.
    Inventors: Marc William Joseph Coughlan, Alexander Quentin Forbes, Peter D. Runcie, Alexander Martin Scholte, Ralph Warta
  • Patent number: 7706525
    Abstract: 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 signal, and output a noise suppressed side-tone signal. The side-tone noise circuit also includes a speaker configured to receive the noise suppressed audio signal and communicate it to a user.
    Type: Grant
    Filed: October 1, 2001
    Date of Patent: April 27, 2010
    Assignee: Kyocera Wireless Corp.
    Inventor: Jay King
  • Publication number: 20090316880
    Abstract: An enhanced sidetone system is disclosed which provides the user of a telecommunications terminal, while speaking, with immediate audio feedback that corresponds to what the far-end party is probably hearing. The sidetone system continuously samples the input speech signal from the user and also obtains signal quality statistics of the transmission path. These statistics can include descriptions of network quality-of-service characteristics (e.g., packet loss rate, etc.) and/or media quality characteristics (e.g., audio distortion due to echo cancellation, etc.). These statistics enable the disclosed technique to determine whether the transmitted signal quality is acceptable. When an unacceptable condition in transmit-path signal quality is detected, the technique modifies the traditional (main) sidetone signal.
    Type: Application
    Filed: June 20, 2008
    Publication date: December 24, 2009
    Applicant: AVAYA TECHNOLOGY LLC
    Inventor: Paul Roller Michaelis
  • Patent number: 7573839
    Abstract: A second output transmission signal (“TX2”) added to a line driver is a scaled version of the main output transmission signal (“TX1”). TX2 is scaled from TX1 by a variable scale factor K. An adaptive hybrid circuit subtracts TX1 and TX2 from a line signal carrying both a line transmission signal and a line received signal (“RX”). A programmable impedance Ztune is coupled between the TX2 output of the line driver and the RX output of the adaptive hybrid circuit. A transmission echo in the output RX signal is measured. K and Ztune are then adaptively tuned to minimize the transmission echo. The hybrid in this case becomes a 4-port network, one port specifically added to adaptively cancel the transmission echo in the RX output of the adaptive hybrid circuit. Alternatively, the hybrid may be a 3-port hybrid including variable impedances to cancel the line transmission signal.
    Type: Grant
    Filed: December 3, 2004
    Date of Patent: August 11, 2009
    Assignee: Broadcom Corporation
    Inventors: Tom Kwan, Sumant Ranganathan
  • Publication number: 20090110184
    Abstract: A real loop and method for using the loop for testing sidetone signal level are provided. The loop is modeled from a coil of cable to represent a straight wire loop. Several conducting wires in a cable may be used. The cable may be configured in a coil and may have a first end and a second end exposed for electrical connections to an even number of wires. Each wire in the even number of wires may be capable of being identified as the same wire on each of the first and second ends of the cable. One or more pairs of wires in the even number of wires may be electrically connected to form an electrical loop. An electrical current passes in opposite directions in the wires in each pair of wires.
    Type: Application
    Filed: October 29, 2007
    Publication date: April 30, 2009
    Applicant: Embarq Holdings Company LLC
    Inventor: Amar Nath Ray
  • Publication number: 20080298577
    Abstract: Disclosed are a method and an apparatus for processing communication signals in a telephony or communication system. In various embodiments, the method or the apparatus comprises identifying a first signal which comprises an incoming communication signal and a feedback signal, controlling a logic for cancelling or suppressing a feedback effect based at least in part upon the first signal, processing the first signal using an adaptive filter based at least in part upon the first signal and a result of controlling the logic for cancelling or suppressing the feedback effect, and causing the processed first signal to be transmitted to a first output device. In some embodiments, the method and the apparatus further comprise identifying a communication context which the communication system is currently in. In some embodiments, the method and apparatus further comprise determining a filter coefficient for the adaptive filter.
    Type: Application
    Filed: May 2, 2008
    Publication date: December 4, 2008
    Applicant: GN Netcom A/S
    Inventors: Poul Kristian MOHL, Bo Bonnichsen, Peter Theilgaard Hounum
  • Patent number: 7457405
    Abstract: An ADSL POTS splitter includes low pass filter. The low pass filter includes a first inductor portion in communication with the line interface and a second inductor portion isolated from the line interface via an isolation capacitor. In one embodiment, the first inductor portion is characterized for non-saturation in conventional operating ranges. The first non-isolated inductor portion has a respective DC saturation current and the isolated inductor portion has a respective DC saturation current. The DC saturation current of the first non-isolated inductor portion is substantially greater than the DC saturation current of the isolated inductor portion for achieving higher inductance in the isolated inductor portion.
    Type: Grant
    Filed: January 28, 2005
    Date of Patent: November 25, 2008
    Assignee: Alcatel Lucent
    Inventor: Richard H. Bailey
  • Patent number: 7450715
    Abstract: The present invention relates to a transceiver for bidirectional frequency division multiplexed transmission, a communication system including one or more transceivers. Optionally, the communication system is a communication system for a digital subscriber line. The transceiver comprises transmission means with a voltage source output or a current source output for transmitting data in a transmission frequency range, receiving means for receiving data in a receiving frequency range, and a coupling impedance for connecting the transmission means and the receiving means to a transmission medium. The magnitude of the coupling impedance in the transmission frequency range is smaller than the magnitude of the coupling impedance in the receiving frequency range if the transmission means has a voltage source output and is higher than the magnitude of the coupling impedance in the receiving frequency range if the transmission means has a current source output.
    Type: Grant
    Filed: September 18, 2007
    Date of Patent: November 11, 2008
    Assignee: Broadcom Corporation
    Inventor: Rudi Verbist
  • Patent number: 7333603
    Abstract: 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 cable. An echo canceller impedance model circuit is coupled to an output of the line driver and is coupled to an input of the line receiver. The echo canceller impedance model circuit generates an echo canceller current that is equal in magnitude and opposite in phase to a current that represents signal echoes that are present in the analog receive signals. The echo canceller impedance model circuit has a variable impedance for generating the echo canceller current. The variable impedance has at least one variable resistor and at least one variable capacitor.
    Type: Grant
    Filed: December 27, 2005
    Date of Patent: February 19, 2008
    Assignee: National Semiconductor Corporation
    Inventors: Peter J. Sallaway, Thulasinath G. Manickam, Sreen Raghavan
  • Patent number: 7330739
    Abstract: 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 audio signal to an inbound audio bitstream. A filter in the device both adds the sidetone bitstream to the inbound audio bitstream and filters the resultant added bitstreams to provide an analog audio signal with sidetone.
    Type: Grant
    Filed: March 31, 2005
    Date of Patent: February 12, 2008
    Assignee: NXP B.V.
    Inventor: Shyam S. Somayajula
  • Patent number: 7224794
    Abstract: 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 signal. Moreover, normal speakerphone conversation is possible during this conversational playback mode allowing the far-end party and/or near-end party to break-in over the played back pre-recorded message as desired and be heard by the other party. Both message and conversation signals are preferably (but not necessarily) at similar levels. Also, the message playback at the near end is preferably (but not necessarily) subject to the same speakerphone digital volume control as that received at the far end.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: May 29, 2007
    Assignee: Agere Systems Inc.
    Inventors: Paul Joseph Davis, Vasu Iyengar, James Charles Popa
  • Patent number: 7149305
    Abstract: 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.
    Type: Grant
    Filed: July 18, 2003
    Date of Patent: December 12, 2006
    Assignee: Broadcom Corporation
    Inventor: Philip Houghton
  • Patent number: 7050574
    Abstract: 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 frequencies appearing on the transmitter output and the telecommunications line. The filter circuit additionally forms a capacitive divider for scaling signals appearing at the transmitter output and canceling the scaled signals at the receiver input with related signals appearing on the telecommunications line. In one embodiment of the present invention for communicating using the ADSL protocol, the filter circuit is a first order high pass filter.
    Type: Grant
    Filed: September 30, 1999
    Date of Patent: May 23, 2006
    Assignee: STMicroelectronics, Inc.
    Inventor: Albert Vareljian
  • Patent number: 7023984
    Abstract: 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 volume is adjusted up or down in response to a control signal that is generated in view of the comparison between the sampled voice volume to ambient noise relationship and the predetermined ambient noise to voice volume relationship.
    Type: Grant
    Filed: March 21, 2002
    Date of Patent: April 4, 2006
    Assignee: BellSouth Intellectual Property Corp.
    Inventors: Shannon M. Short, William A. Hartselle, Vernon Meadows
  • Patent number: 7020277
    Abstract: 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 input signal voltage from an analog front end (AFE) chip, an output port, a line driver for amplifying the input signal voltage and supplying a transmit signal to the output port, a line port for sending the transmit signal and receiving a receive signal, termination resistors coupled between the output port and the line port, a receive signal port for supplying the receive signal to the AFE chip, a receive amplifier formed on the AFE chip coupled to the receive signal port, and a bridge network resistively coupling the line port and the output port to the receive signal port, the bridge network having a low-pass filter characteristic.
    Type: Grant
    Filed: December 5, 2001
    Date of Patent: March 28, 2006
    Assignee: LSI Logic Corporation
    Inventors: Sang-Soo Lee, Samuel W. Sheng, Cormac S. Conroy
  • Patent number: 7003096
    Abstract: 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 amount of a replacement side tone fed back to the receiver. This enables at least 50 dB of gain to be applied to the modified received signal without initiating unstable operation, or howl, in the set, and ensures that the received and side tone signals are heard by the user with equal comfort and clarity. The digital signal processor also enables additional enhancements to be made to the modified received signal that are beneficial to hearing impaired users, such as dynamic range compression, “soft” limiting, and low level emphasis within selectable frequency bands.
    Type: Grant
    Filed: September 12, 2002
    Date of Patent: February 21, 2006
    Assignee: Plantronics, Inc.
    Inventors: David G. Lashley, Robert L. Doss
  • Patent number: 6993126
    Abstract: 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.
    Type: Grant
    Filed: April 28, 2000
    Date of Patent: January 31, 2006
    Assignee: Clearsonics Pty Ltd
    Inventors: Mykola Kyrylenko, Lambertus Anthony Mary Voskulen
  • Patent number: 6993125
    Abstract: 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 level linked to the amplitude of the subscriber's voice signal in a linear non-adjustable 1:1 relationship (as is done in the prior art), the present variable sidetone system implements an adjustable relationship between the amplitude of the subscriber's voice signal and sidetone levels, thereby allowing the variable sidetone system to provide the necessary acoustic feedback to subscribers to maintain the subscriber's voice signal within the predetermined bounds of the voice encoder.
    Type: Grant
    Filed: March 6, 2003
    Date of Patent: January 31, 2006
    Assignee: Avaya Technology Corp.
    Inventor: Paul R. Michaelis
  • Patent number: 6980644
    Abstract: 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 cable. An echo canceller impedance model circuit is coupled to an output of the line driver and is coupled to an input of the line receiver. The echo canceller impedance model circuit generates an echo canceller current that is equal in magnitude and opposite in phase to a current that represents signal echoes that are present in the analog receive signals. The echo canceller impedance model circuit has a variable impedance for generating the echo canceller current. The variable impedance has at least one variable resistor and at least one variable capacitor.
    Type: Grant
    Filed: May 12, 2000
    Date of Patent: December 27, 2005
    Assignee: National Semiconductor Corporation
    Inventors: Peter J. Sallaway, Thulasinath G. Manickam, Sreen Raghavan
  • Patent number: 6925172
    Abstract: 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 an output of a receiver amplifier, and a transmission line interface circuit that is coupled to an output of the transmission amplifier and to an input of the receiver amplifier. The transmission line interface circuit includes a matching impedance that is directly coupled to a feedback path of the transmission amplifier and that terminates the transmission line of the transceiver system.
    Type: Grant
    Filed: January 25, 2002
    Date of Patent: August 2, 2005
    Assignee: Analog Devices, Inc.
    Inventors: Faramarz Sabouri, John P. Guido, John G. Kenney, Jr.
  • Patent number: 6870928
    Abstract: 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 circuit for receiving a receive signal from the transformer. The transformer includes a first port coupled to the transmission line, a second port coupled to the driver circuit, a third port coupled to the receiver circuit, a first winding part having a turns ratio of 1: n, where n>1, for coupling the transmit signal from the second port to the first port, and a second winding part having a turns ratio of 1: m, where m<n, for coupling the receive signal from the first port to the third port.
    Type: Grant
    Filed: May 25, 2001
    Date of Patent: March 22, 2005
    Assignee: LSI Logic Corporation
    Inventors: Cormac S. Conroy, Samuel W. Sheng, Ara Bicakci, John DeCelles, Sang-Soo Lee
  • Patent number: 6850617
    Abstract: 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.
    Type: Grant
    Filed: January 12, 2000
    Date of Patent: February 1, 2005
    Assignee: National Semiconductor Corporation
    Inventor: David Lind Weigand
  • Patent number: 6842517
    Abstract: 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 filtering circuit is needed for attenuating interferences to such an extent that integrated circuits operating with low voltages are not overloaded.
    Type: Grant
    Filed: February 26, 2001
    Date of Patent: January 11, 2005
    Assignee: Infineon Technologies AG
    Inventor: Rainer Storn