Soft Switching, Muting, Or Noise Gating Patents (Class 381/94.5)
  • Patent number: 10477308
    Abstract: A circuit and a receiver comprising the circuit, the circuit is able to either feed a received signal directly to the receiver coil or amplify the signal before transmission to the coil. The circuit receives a supply power and amplifies the input signal if the supply power exceeds a threshold value.
    Type: Grant
    Filed: December 29, 2017
    Date of Patent: November 12, 2019
    Assignee: Sonion Nederland B.V.
    Inventor: Aart Zeger van Halteren
  • Patent number: 10224889
    Abstract: The present disclosure discloses an audio output circuit including an audio power amplifier, a mute control circuit and a microcontroller, the audio power amplifier includes a power input terminal, a mute control terminal and an audio signal output terminal, the power input terminal is used to connect a power supply to obtain a power supply voltage, the mute control terminal is connected with the microcontroller through the mute control circuit and is grounded by a pull-down resistor, the audio signal output terminal is used to output an audio signal, the mute control circuit is also connected to the power supply for disconnecting the mute control terminal from the microcontroller when the power supply voltage is less than a preset voltage. The present disclosure also provides an audio device. According to the present disclosure, it is possible to effectively prevent the POP sound of the speaker of the audio device.
    Type: Grant
    Filed: February 20, 2017
    Date of Patent: March 5, 2019
    Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd
    Inventor: Wendong Li
  • Patent number: 9973094
    Abstract: In accordance with an embodiment, a method includes disabling a first electronic switch connected in series with a primary winding of a transformer in a power converter circuit if an auxiliary voltage across an auxiliary winding of the transformer is outside a predefined voltage range. The power converter circuit further includes a secondary winding of the transformer, and a rectifier circuit connected between the secondary winding and an output, where the rectifier circuit comprises a second electronic switch.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: May 15, 2018
    Assignee: INFINEON TECHNOLOGIES AUSTRIA AG
    Inventors: Marc Fahlenkamp, Martin Krueger
  • Patent number: 9860659
    Abstract: An electronic device comprising: a memory; a headphone jack; and at least one processor operatively coupled to the memory, configured to: detect an impedance of a first portion of the headphone jack; and detect whether a foreign substance is present in the headphone jack based on the impedance of the first portion of the headphone jack.
    Type: Grant
    Filed: November 30, 2015
    Date of Patent: January 2, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jin-Hee Won, Ho-Jun Kim, Kyung-Min Park, Gi-Hoon Lee, Sung-Bin Hong
  • Patent number: 9742964
    Abstract: An AV device including a first signal transmitter configured to output a video signal and a first audio signal corresponding to the video signal to a display device; a first signal receiver configured to receive a feedback signal of the first audio signal from the display device; a second signal transmitter configured to output a second audio signal corresponding to the video signal; and a controller configured to determine a processing delay time of the display device by comparing the first audio signal and the feedback signal, and control the second signal transmitter to delay the output of the second audio signal based on the determined processing delay time.
    Type: Grant
    Filed: August 20, 2014
    Date of Patent: August 22, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Byeong-hu Lee, Myoung-ho Kim, Yong-hee Park, Jung-sub Lee
  • Patent number: 9686607
    Abstract: An audio processing integrated circuit chip, such as codec chip, includes at least one port output circuit configured to generate an audio signal to drive an external audio device and a PC beep circuit configured to receive a PC beep signal and to apply the received PC beep signal to an input of the at least one port output circuit. The chip further includes a control circuit configured to detect activity of the PC beep signal and to enable and/or disable the at least one port output circuit responsive to the detected activity.
    Type: Grant
    Filed: March 1, 2012
    Date of Patent: June 20, 2017
    Assignee: Tempo Semiconductor, Inc.
    Inventors: Qichang Wu, Daniel Bogard, Shun Qian
  • Patent number: 9515646
    Abstract: A grounding switch is described which operates properly even in the presence of negative voltages on a signal line. The grounding switch uses isolated field effect transistors that have their substrates tied to different voltages. The isolated field effect transistor has a gate voltage and substrate voltage which can be pulled down to a negative voltage when the signal line has a negative voltage allowing the switch to remain open even with a negative voltage.
    Type: Grant
    Filed: September 3, 2013
    Date of Patent: December 6, 2016
    Assignee: CONEXANT SYSTEMS, INC.
    Inventors: Christian Larsen, Lorenzo Crespi
  • Patent number: 9516414
    Abstract: A communication device and method for adapting to audio accessories are provided. The communication device includes a memory; a first microphone, a connector for receiving data from an accessory device having a second microphone, and a processor interconnected with the memory, the microphone and the connector. The processor is configured to receive audio input and, when the audio input originated at the second microphone, to automatically apply equalization settings corresponding to the second microphone.
    Type: Grant
    Filed: July 9, 2014
    Date of Patent: December 6, 2016
    Assignee: BLACKBERRY LIMITED
    Inventors: Per Magnus Fredrik Hansson, Craig Eric Ranta, Mohamad El-Hage
  • Patent number: 9485568
    Abstract: A driver controller comprising a state machine for controlling transitions between a plurality of states. An output switch for providing a low impedance path to ground during transition periods. An output stage for decoupling output signal from driver amplifier during the transition periods.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: November 1, 2016
    Assignee: CONEXANT SYSTEMS, INC.
    Inventors: Christian Larsen, Lorenzo Crespi, Mouna Elkhatib, Mary Xiao-Hua Lu, James Bunde Villadsen Skov
  • Publication number: 20150146884
    Abstract: A circuit for suppressing audio output noise and an audio output circuit are provided. The circuit for suppressing audio output noise includes: a detecting circuit, configured to detect output voltages of output stages of an audio power amplifier; a control circuit, configured to output at least one control signal, the control signal is related to detection results of the detecting circuit; and a compensating circuit, configured to compensate at least one output stage of the audio power amplifier which includes a differential circuit based on the at least one control signal output by the control circuit, to make parameters of the differential circuit symmetrical or approach symmetrical. Based on detection results of the output stage voltages, the differential circuit in the output stages of the audio power amplifier is compensated. The circuit for suppressing audio output noise has a wider application scope and it is easy to design the circuit.
    Type: Application
    Filed: August 6, 2014
    Publication date: May 28, 2015
    Inventor: Xun ZHANG
  • Patent number: 9036830
    Abstract: A purpose of the invention is to provide a noise gate that can output an audio signal in which only a stationary noise is removed, without degrading an utterance voice of a speaking person. A sound collection device 1 includes an FFT processing unit 11, the noise gate 12, and an IFFT processing unit 13. The sound collection device 1 transforms a collected audio signal NET into a frequency spectrum NE?N by using the FFT processing unit 11. The noise gate 12 estimates a noise spectrum N?N of a stationary noise based on the frequency spectrum NE?N of the audio signal. The noise gate 12 decreases a signal level (a gain) of the audio signal in a case where a signal level ratio of the frequency spectrum NE?N of the audio signal to the noise spectrum N?N is less than a threshold value, and outputs the audio signal.
    Type: Grant
    Filed: November 18, 2009
    Date of Patent: May 19, 2015
    Assignee: YAMAHA CORPORATION
    Inventors: Ryo Tanaka, Naoto Kuriyama
  • Publication number: 20150131811
    Abstract: A signal output device includes: a control circuit for receiving at least a first input control signal and outputting an output control signal according to at least the first input control signal, wherein the first input control signal has a first signal segment followed by a second signal segment, and a voltage level of the first signal segment is unknown; and a driver circuit, operated according to a supply power, for receiving the output control signal from the control circuit; wherein a voltage of the supply power is settle before the second signal segment of the first input control signal is received by the control circuit; when the supply power is turned on, the driver circuit operates under a specific power state; and when the second signal segment of the first input control signal is received by the control circuit, the driver circuit keeps operating under the specific power state.
    Type: Application
    Filed: January 21, 2015
    Publication date: May 14, 2015
    Inventors: Tsung-Kai Kao, Pao-Cheng Chiu, Chien-Ming Chen
  • Patent number: 9025793
    Abstract: A selector selects an analog audio signal input to one input port from among analog audio signals input to multiple input ports according to an instruction from the user. An analog gain control circuit amplifies the analog audio signal received from the selector, with a corresponding one of the gains set for the respective input ports. An analog gain control circuit is configured to gradually change its gain when the gain is switched. An A/D converter converts an output signal of the analog gain control circuit into a digital audio signal. A first audio signal processing circuit is monolithically integrated on a signal semiconductor substrate.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: May 5, 2015
    Assignee: Rohm Co., Ltd.
    Inventor: Mitsuteru Sakai
  • Patent number: 9025791
    Abstract: A device implementing a scheme for reduction of pop-up noise is disclosed. The device comprises an audio sub-system (100) having an integrator (112) for amplifying an input signal (133) and a modulation circuit (114) including one or more comparators. The audio subsystem (100) is further provided with a feedback loop (142) across the integrator (112) and the modulation circuit (114) to calibrate an offsets outputs of the integrator (112) and the modulation circuit (114). The feedback loop (142) includes an integrator-offset loop (202) across the integrator (112) to calibrate an offset (136) in the output of the integrator (112), and an offset calibration loop (302) across the modulation circuit (114) to calibrate an offset (140) in the output of the modulation circuit (114).
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: May 5, 2015
    Assignee: ST-Ericsson SA
    Inventors: Ankit Seedher, Raja J. Prabhu, Shyam S. Somayajula
  • Patent number: 9020165
    Abstract: Pop/clock noise reduction circuitry is disclosed for audio output circuitry. After audio output circuitry is enabled, reference voltage generator circuitry is then enabled to produce a reference voltage that ramps from a first voltage level to a second voltage level at a smooth rate. The ramping reference voltage is applied to the input of the audio output circuitry to reduce or prevent pop/click noise for the audio output circuitry. Further, negative offset control circuitry can also be used to provide a negative offset input to the audio output circuitry to remove initial step-up voltage levels that may exist at operational power-up for the audio output circuitry. Still further, current control circuitry can also be used that limits the available current flowing to the output node for the audio output circuitry, thereby further reducing and/or preventing potential pop/click noise in the audio output signals.
    Type: Grant
    Filed: October 9, 2012
    Date of Patent: April 28, 2015
    Assignee: Silicon Laboratories Inc.
    Inventor: Eduardo Viegas
  • Patent number: 9014396
    Abstract: An audio system that reduces or eliminates click and pop noise during power up and power down operations. In particular, the audio system includes an amplifier with an input adapted to receive an input audio signal and an output adapted to produce an amplified output audio signal for an associated speaker. The audio system further includes a noise reduction circuit adapted to smoothly apply and remove a DC voltage to and from the output of the amplifier in a manner that reduces or eliminates click and pop noise from being generated by the associated speaker. The DC voltage at the output of the amplifier may be derived from a DC reference voltage source and/or from the input audio signal.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: April 21, 2015
    Assignee: QUALCOMM Incorporated
    Inventor: Guoqing Miao
  • Patent number: 9008329
    Abstract: Provided are methods and systems for noise suppression within multiple time-frequency points of spectral representations. A multi-feature cluster tracker is used to track signal and noise sources and to predict signal versus noise dominance at each time-frequency point. Multiple features, such as binaural and monaural features, may be used for these purposes. A Gaussian mixture model (GMM) is developed and, in some embodiments, dynamically updated for distinguishing signal from noise and performing mask-based noise reduction. Each frequency band may use a different GMM or share a GMM with other frequency bands. A GMM may be combined from two models, with one trained to model time-frequency points in which the target dominates and another trained to model time-frequency points in which the noise dominates. Dynamic updates of a GMM may be performed using an expectation-maximization algorithm in an unsupervised fashion.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: April 14, 2015
    Assignee: Audience, Inc.
    Inventors: Michael Mandel, Carlos Avendano
  • Publication number: 20150071463
    Abstract: It is inter alia disclosed to determine a peak energy level for an audio frame of a band limited audio signal; determine that the peak energy level is a maximum peak energy level by determining that the peak energy level exceeds a peak energy level determined for at least one neighboring audio frame by a first predetermined energy threshold value; classify a region of audio samples associated with the maximum peak energy level as an audio click; and suppress audio samples of the region of audio samples classified as an audio click by multiplying at least one audio sample of the audio frame with a sample wise suppressor gain function.
    Type: Application
    Filed: March 30, 2012
    Publication date: March 12, 2015
    Applicant: Nokia Corporation
    Inventors: Riitta Elina Niemistö, Jorma Mäkinen
  • Publication number: 20150071464
    Abstract: A class D amplifier receives and amplifies a differential analog signal which is then differentially integrated. Two pulse width modulators generate pulse signals corresponding to the differentially integrated analog signal and two power units generate output pulse signals. The outputs the power units are coupled to input terminals of integrators via a resistor feedback network. An analog output unit converts the pulse signals to an output analog signal. The differential integration circuitry implements a soft transition between mute/un-mute. In mute, the integrator output is fixed. During the soft transition, the PWM outputs change slowly from a fixed 50% duty cycle to a final value to ensure that no pop noise is present in the output as a result of mode change.
    Type: Application
    Filed: September 5, 2014
    Publication date: March 12, 2015
    Applicant: STMicroelectronics (Shenzhen) R&D Co. Ltd.
    Inventors: Ru Feng Du, Qi Yu Liu
  • Publication number: 20150063593
    Abstract: An amplifier may include two or more pulse-width modulators (PWMs) controlling respective sets of switches to produce an amplified version of a source signal. The clocking for the amplifier may be controlled to delay signal processing within the PWMs relative to one another in time, thereby providing an effective time offset between the absolute moment in time of the edge transition of the controlling signals to the respective sets of switches. The PWMs may include a decrementor that counts down to zero from the next PWM duty-cycle value when a new data sample is detected, beginning a new count when the next sample is present. The PWM output may correspond to the counter value, outputting a pulse when the counter value is nonzero. A “data-sample-ready” signal may be decoded from a master counter, which may be clocked based on the high speed PWM clock, and the delay mechanism may be based on adjusting the decode value to determine when the PWM should initialize to the next data sample.
    Type: Application
    Filed: September 18, 2014
    Publication date: March 5, 2015
    Inventors: Douglas E. Heineman, Mark A. Alexander
  • Patent number: 8965006
    Abstract: A de-pop controller and method thereof are provided. The controller includes an amplifier and a comparator. The amplifier receives and amplifies an audio input signal, and then outputs an audio output signal. The comparator, coupled to the amplifier, receives a transient indication signal. The comparator compares the transient indication signal with a reference voltage, and the comparison result is then applied to control the driving ability of the amplifier for de-popping.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: February 24, 2015
    Assignee: MStar Semiconductor, Inc.
    Inventors: Guo-Kiang Hung, Tso Min Chen
  • Patent number: 8949120
    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: April 13, 2009
    Date of Patent: February 3, 2015
    Assignee: Audience, Inc.
    Inventors: Mark Every, Ludger Solbach, Carlo Murgia, Ye Jiang
  • Publication number: 20150016630
    Abstract: A device for grounding pop-click noise may include an output block configured to generate an output signal at an output node. A switch circuit coupled to the output node may be configured to be operable to couple the output node to a ground potential. The switch circuit may include a first and a second transistor. A drain, a source, and a gate node of the first transistor may be coupled to the output node, a drain node of the second transistor, and a first control signal, respectively. A drain, a source, and a gate node of the second transistor may be coupled to a source node of the first transistor, the ground potential, and a second control signal, respectively. The first and the second control signals may operate the switch circuit to couple the output node to the ground potential during a pre-determined period associated with the pop-click noise.
    Type: Application
    Filed: September 6, 2013
    Publication date: January 15, 2015
    Applicant: BROADCOM CORPORATION
    Inventors: Yang XU, Dale George Frederick Stubbs, Khaled Mahmoud Abdelfattah Aly
  • Patent number: 8934642
    Abstract: A switch can be configured to receive a first signal at a first input and provide an output signal at an output, depending on a state of the switch. A switch state change can be delayed until an indication of a requested switch state different than a current switch state is received and the first signal reaches a threshold.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: January 13, 2015
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Julie Lynn Stultz, Steven Macaluso, Enrique O. Rodriguez
  • Publication number: 20140369520
    Abstract: Self-grounded circuitry (10) includes a signal channel conducting an output voltage (VOUT1). A charge pump (2) powered by a reference voltage (VDD) produces a control voltage (VCP). The control signal is at a low level if the reference voltage is low and is boosted to a high level if the reference voltage is high. A ground switch circuit (15) includes a depletion mode transistor (MP1) having a source coupled to the output voltage, a gate coupled to the control voltage, and a drain coupled to ground. The transistor includes a well region (4-1) and a parasitic substrate diode (D3-1).
    Type: Application
    Filed: June 18, 2013
    Publication date: December 18, 2014
    Inventors: David H. Elwart, II, Vikas Suma Vinay, Christopher M. Graves, Baher S. Haroun
  • Patent number: 8903463
    Abstract: A mobile communication terminal is provided including an audio processing unit, a speaker, a connecting unit that connects to an external audio output device and indicates whether the external audio output device is connected, and a control unit configured to, while in a silent mode, control the audio processing unit to reproduce a music file and to output audio signals, corresponding to the reproduced music file, through the speaker, the silent mode being a mode wherein a vibration signal is generated upon receiving an incoming call, if the external audio output device is connected to the connecting unit, output the audio signals to the external audio output device, and if the external audio output device is disconnected from the connecting unit while the audio signals are being output to the external audio output device, control the display unit to display a user interface for continuing reproduction of the music file.
    Type: Grant
    Filed: April 2, 2014
    Date of Patent: December 2, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jong-Sub Lee, Kyoung-Ae Lim, Kyoung-Shin Lee, Seung-Chul Choi
  • Publication number: 20140348343
    Abstract: An audio device is capable of switching between a first state and a second state. The audio device comprises a power supply, a delay module, a control module, a processor, and an audio-playing module. The power supply provides a working voltage when the audio device is in the second state. The delay module is connected between the power supply and the control module, and outputs a delay signal when the audio device switches between the first state and the second state. The control module for outputting a driving signal is prevented from outputting driving signal in response to the delay signal, and the processor is enabled in response to the delay signal.
    Type: Application
    Filed: December 30, 2013
    Publication date: November 27, 2014
    Applicants: HON HAI PRECISION INDUSTRY CO., LTD, HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD .
    Inventors: YA-GUO WANG, CHUN-CHING CHEN
  • Patent number: 8891787
    Abstract: A POP noise suppressing circuit includes a blocking capacitor, an outputting element connected to the blocking capacitor, a current generating unit, a charging unit connected to the current generating unit, a discharging unit connected to the current generating unit, a switching unit connected to the charging unit and the discharging unit and a power amplifying unit connected between the switching unit and the blocking capacitor. The current generating unit provides two slowly increasing currents respectively to the charging unit and the discharging unit. The switching unit is for switching between the charging unit and the discharging unit. The charging unit forms a charging current. The discharging unit forms a discharging current. The voltage of the blocking capacitor increases smoothly in a process of powering on and decreases smoothly in a process of powering off. A POP noise suppressing method is also provided.
    Type: Grant
    Filed: April 24, 2012
    Date of Patent: November 18, 2014
    Assignee: IPGoal Microelectronics (SiChuan) Co., Ltd.
    Inventor: Junwei Huang
  • Patent number: 8880130
    Abstract: A method for reproducing a music file of a mobile communication terminal includes outputting a confirmation message for determining whether a music file is to be reproduced if reproduction of the music file is requested during the manner mode of the mobile communication terminal, and reproducing the music file if an external output device is connected to the mobile communication terminal. Since a user can reproduce music files without any complex key manipulation, even during the manner mode of the mobile communication terminal, the user can listen to desired music easily, thereby improving the convenience of the mobile communication terminal.
    Type: Grant
    Filed: February 19, 2013
    Date of Patent: November 4, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jong-Sub Lee, Kyoung-Ae Lim, Kyoung-Shin Lee, Seung-Chul Choi
  • Publication number: 20140270252
    Abstract: A method and apparatus are provided for processing a received digital radio broadcast signal to efficiently remove signal interference artifacts from digital and/or analog signals by using signal quality information extracted from audio samples in one or more buffered audio frames to detect audio frames containing clipped noise artifacts and weaker noise artifacts and to selectively apply anti-interference processing to remove the signal interference artifacts.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: IBIQUITY DIGITAL CORPORATION
    Inventors: Ashwini Pahuja, Weifeng Mu
  • Publication number: 20140270251
    Abstract: A system and method for sharing a designated audio signal may reproduce the designated audio signal via transducer into an acoustic space. The designated audio signal may be a recorded audio signal, an encoded audio signal, a streamed audio signal and an audio signal component of a multi-media content item. An input audio signal may be received representing a sound field in the acoustic space. One or more microphones may receive the input audio signal. A component contributed by the reproduced designated audio signal may be suppressed in the input audio signal. An echo suppressor may suppress the recaptured designated audio signal. The designated audio signal may be mixed with the suppressed input audio signal to generate an uplink audio signal. The designated audio signal mixed with the suppressed input audio signal may not include artifacts caused by the transducer, the microphone and the acoustic space.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: QNX Software Systems Limited
    Inventors: Leona Arlene Neufeld, Phillip Alan Hetherington
  • Patent number: 8831247
    Abstract: A phantom power circuit has a detection circuit and a limiting circuit, the detection circuit detecting a pulse current generated in association with connection or disconnection of a condenser microphone, the limiting circuit limiting the output of the condenser microphone. The detection circuit detects a pulse current generated between input terminals of the condenser microphone. The limiting circuit reduces the output from the condenser microphone when the detection circuit detects the pulse current.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: September 9, 2014
    Assignee: Kabushiki Kaisha Audio-Technica
    Inventor: Hiroshi Akino
  • Patent number: 8818005
    Abstract: A switch controller is provided that uses one or more capacitors to generate a slow turn on/slow turn off switch control signals to suppress audible switching noise in an audio switch. In some embodiments, an analog inverter and a capacitor are used to generate the switch control signals, while in other embodiments two capacitors are used to generate the switch control signals. To conserve power between switching states, routing logic is provided that ties the switch control signals to respective voltage rails and disables selected portions of the switch controller.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: August 26, 2014
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Tyler Daigle, Julie Stultz
  • Patent number: 8806234
    Abstract: A motherboard includes a motherboard power supply connector and a time delay circuit. The motherboard power supply connector connects a power supply unit. The motherboard power supply connector has a power supply on pin and a power good pin. The power good pin is configured for receiving a power good signal from the power supply unit. The time delay circuit has an input terminal and an output terminal. The input terminal is configured for receiving a power supply on signal. The output terminal is connected to the power supply on pin and is configured for sending the power supply on signal to the power supply on pin after a time delay determined by the time delay circuit.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: August 12, 2014
    Assignees: Hong Fu Jin Precision Industry (ShenZhen) Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Song-Lin Tong, Qi-Yan Luo, Peng Chen
  • Patent number: 8798289
    Abstract: An adaptive power control monitors the noise level within a primary acoustic signal and compares the noise level to a threshold. If the noise level is lower than the threshold, a noise suppression system is deactivated and bypass filtering and cross fading are enabled. If the noise level is higher than the threshold, the noise suppression system is activated.
    Type: Grant
    Filed: August 5, 2009
    Date of Patent: August 5, 2014
    Assignee: Audience, Inc.
    Inventors: Mark Every, Carlos Avendano, Ye Jiang, Ludger Solbach, Carlo Murgia
  • Patent number: 8761408
    Abstract: A signal processing apparatus includes: one or more detection means for detecting movement of a diaphragm of a speaker in correspondence with feedback methods that are different feedback methods; analog-to-digital conversion means for converting one or more detection signals acquired by the detection means into a digital form; feedback signal generating means for generating feedback signals corresponding to the feedback methods using the digital detection signals; synthesis means for combining an audio signal to be output as a driving signal of the speaker with the feedback signals; correction equalizer means for setting an equalizing characteristic to allow a sound reproduced by the speaker to have a target frequency characteristic by changing the digital audio signal; feedback operation setting means for setting feedback methods in which a feedback operation up to combining the audio signal with the feedback signal is performed and the feedback operation is not performed equalizing characteristic changing a
    Type: Grant
    Filed: May 20, 2010
    Date of Patent: June 24, 2014
    Assignee: Sony Corporation
    Inventors: Michiaki Yoneda, Taro Nakagami
  • Patent number: 8755544
    Abstract: The present disclosure provides an earphone power amplifier, including a ground contact connected to a ground wire of an earphone, a left sound channel power amplifying circuit connected to a left sound channel of the earphone, and a right sound channel power amplifying circuit connected to a right sound channel of the earphone. The left sound channel power amplifying circuit includes a first operational amplifier and a first positive feedback exported from an input end of the first ferrite bead to an in-phase input end of the first operational amplifier, the right sound channel power amplifying circuit includes a second operational amplifier and a second positive feedback exported from the input end of the first ferrite bead to an in-phase input end of the second operational amplifier.
    Type: Grant
    Filed: October 10, 2012
    Date of Patent: June 17, 2014
    Assignee: Huawei Device Co., Ltd.
    Inventors: Haitao Zhen, Yongxiang Yang, Xuxing Yan
  • Patent number: 8750537
    Abstract: An apparatus for a portable electronic device for receiving a jack of a headset, the jack including a set of lines, the set of lines including at least one audio line, a ground signal and a microphone signal line, the apparatus comprising a set of switches for receiving the ground signal line and the microphone signal line and a sensing circuit for reducing induced noise from the headset, wherein the sensing circuit is located between the set of switches and the microphone signal line and ground signal line.
    Type: Grant
    Filed: December 6, 2010
    Date of Patent: June 10, 2014
    Assignee: BlackBerry Limited
    Inventor: Jens Kristian Poulsen
  • Patent number: 8744094
    Abstract: According to some aspects, an electronic device adapted to provide audio output via an audio system. The electronic device includes an audio jack adapted to be coupled to the audio system. The audio jack includes a line-out for sending audio signals to the audio system and a ground return line. The electronic device also includes a ground resistor between the ground return line and a ground node. The ground resistor has a resistance selected to reduce ground current on the ground return line when the electronic device is being charged without significantly adversely affecting the quality of the audio output.
    Type: Grant
    Filed: April 18, 2011
    Date of Patent: June 3, 2014
    Assignee: BlackBerry Limited
    Inventors: Jens Kristian Poulsen, Yong Zhang
  • Patent number: 8725280
    Abstract: Provided is an audio output device capable of preventing noises and improving the S/N ratio even if no audio signal is inputted in the middle of the input of audio signals, or even if an audio-signal input state and a no-signal state are alternately repeated. In the provided audio output device, a multiplier is provided on the input side of each of the delayers. Each multiplier multiplies the addition output of the corresponding one of adders by a multiplier coefficient supplied by the coefficient counter. If there is no input of digital audio signals into a ?? modulator, the counter control circuit decreases the output of the coefficient counter down to 0 stepwise at predetermined intervals.
    Type: Grant
    Filed: August 24, 2011
    Date of Patent: May 13, 2014
    Assignee: Rohm Co., Ltd.
    Inventor: Yasutomo Yokoyama
  • Patent number: 8717097
    Abstract: An amplifier with improved noise reduction is disclosed. In one implementation, an amplifier is provided that includes a main output stage configured to output an amplified signal at a main output terminal, a secondary output stage configured to output a copy of the amplified signal at a secondary output terminal, and a signal coupler configured to provide a variable resistance coupling between the secondary output terminal and the main output terminal to reduce noise at the main output terminal.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: May 6, 2014
    Assignee: QUALCOMM Incorporated
    Inventor: Vijayakumar Dhanasekaran
  • Publication number: 20140098974
    Abstract: Pop/clock noise reduction circuitry is disclosed for audio output circuitry. After audio output circuitry is enabled, reference voltage generator circuitry is then enabled to produce a reference voltage that ramps from a first voltage level to a second voltage level at a smooth rate. The ramping reference voltage is applied to the input of the audio output circuitry to reduce or prevent pop/click noise for the audio output circuitry. Further, negative offset control circuitry can also be used to provide a negative offset input to the audio output circuitry to remove initial step-up voltage levels that may exist at operational power-up for the audio output circuitry. Still further, current control circuitry can also be used that limits the available current flowing to the output node for the audio output circuitry, thereby further reducing and/or preventing potential pop/click noise in the audio output signals.
    Type: Application
    Filed: October 9, 2012
    Publication date: April 10, 2014
    Applicant: SILICON LABORATORIES INC.
    Inventor: Eduardo Viegas
  • Patent number: 8687821
    Abstract: An amplifier is disclosed, wherein the output stage is split between a primary output stage and a secondary stage. To minimize or eliminate any audible plop when the amplifier is switched on, the primary stage is connected, and the second stage is gradually connected using a switch. The gradual connection can be by means of varying the pulse-density of a pulse wave modulation on the switch, from fully open (0% pulse-density) to fully closed (100%). The inverse process can minimize or eliminate plop during switch-off. Separate feedback loops are switchable, from the primary and secondary stages; in a DC-coupled embodiment, the feedback loop from the secondary stage may include DC-offset cancelling circuitry, to both reduce or eliminate the plop and avoid and DC-offset current through the speaker.
    Type: Grant
    Filed: November 12, 2010
    Date of Patent: April 1, 2014
    Assignee: NXP B.V.
    Inventor: Han Martijn Schuurmans
  • Publication number: 20140086432
    Abstract: A POP noise suppression circuit includes a power source terminal, a clock signal input terminal, a charge unit, a discharge unit, a common-mode voltage judging and switching control unit, a charge and discharge capacitor, and a ground terminal. The charge unit includes a first clock generation circuit for generating a first pair of non-overlapped clock signal, and a first equivalent resistor. The discharge unit includes a second clock generation circuit for generating a second pair of non overlapped clock signals, and a second equivalent resistor. The charge unit generates a charge voltage changing slowly to the charge and discharge capacitor. The discharge unit generates a discharge voltage changing slowly to the charge and discharge capacitor. A POP noise suppression system is further provided.
    Type: Application
    Filed: September 21, 2012
    Publication date: March 27, 2014
    Inventor: Baoding Yang
  • Publication number: 20140086423
    Abstract: Various embodiments are directed to cooperation among communications devices having microphones to employ their microphones in unison to provide voice detection with noise reduction for voice communications. A first communications device comprises a processor circuit; a first microphone; an interface operative to communicatively couple the processor circuit to a network; and a storage communicatively coupled to the processor circuit and arranged to store a sequence of instructions operative on the processor circuit to store a first detected data that represents sounds detected by the first microphone; receive a second detected data via the network that represents sounds detected by a second microphone of a second communications device; subtractively sum the first and second data to create a processed data; and transmit the processed data to a third communications device. Other embodiments are described and claimed herein.
    Type: Application
    Filed: September 25, 2012
    Publication date: March 27, 2014
    Inventors: Gustavo D. Domingo Yaguez, Keith L. Shippy, Mark H. Price, Jennifer A. Healey
  • Patent number: 8681853
    Abstract: A pulse density modulation, PDM, driver, outputs a PDM stream and can be switched to a control token. The switch takes place when the first integral of the PDM stream has a magnitude less than or equal to a first predetermined value and the second integral of the PDM stream has a magnitude less than or equal to a second predetermined value.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: March 25, 2014
    Assignee: NXP B.V.
    Inventor: Lûtsen Ludgerus Albertus Hendrikus Dooper
  • Publication number: 20140072143
    Abstract: Methods and systems for cancelation of table noise in a speaker system used for video or audio conferencing are disclosed. Table noise is cancelled in one embodiment by providing a signal or a message whenever a key is depressed on a keyboard or a mouse is clicked. When the key depression signal or message is received, the system evaluates whether speech is occurring. If speech is not occurring, then the microphone in the system is muted. However, if speech is occurring, the microphone is not muted for a period of time to allow the speech to be transmitted to the far end. This allows the conference to be continued in the presence of keyboard sounds if speech is occurring at the same time but also silences the keyboard sounds if speech is not occurring.
    Type: Application
    Filed: April 17, 2013
    Publication date: March 13, 2014
    Inventors: Yibo Liu, Peter L. Chu, Jeff Rodman
  • Patent number: 8654991
    Abstract: An inverting amplifier which drives headphones via an output capacitor includes: an operational amplifier, an input resistor having a first terminal via which an audio signal to be amplified is received, and a second terminal connected to an inverting input terminal of the operational amplifier; and a feedback resistor having a first terminal connected to an inverting input terminal of the operational amplifier, and a second terminal connected to the output terminal. A reference voltage source generates a bias voltage Vb, and supplies it to the non-inverting input terminal. A discharging path includes a discharging resistor and a first switch arranged in series between an output terminal of the reference voltage source and an fixed voltage terminal. A second switch is arranged between the output terminal of the operational amplifier and a node on the discharging path where the electric potential is higher than it is at the discharging resistor.
    Type: Grant
    Filed: June 7, 2010
    Date of Patent: February 18, 2014
    Assignee: Rohm Co., Ltd.
    Inventors: Katsuyuki Ono, Akinobu Kawamura
  • Patent number: 8644110
    Abstract: Methods and systems utilizing seismic sensors configured or designed for use in seismic signal detection are provided so as to reduce the occurrence of spurious responses of the sensors. A method of seismic surveying using a seismic sensor may include the steps of deploying the seismic sensor at a location for seismic signal detection and acquiring seismic signals. The seismic signals may include high frequency response signals containing spurious response signals at an identifiable bandwith. The method may further include applying spurious response cancellation based on the bandwidth location of the spurious response signals and generating modified seismic waveforms having extended frequency bandwidth.
    Type: Grant
    Filed: May 20, 2011
    Date of Patent: February 4, 2014
    Assignee: Schlumberger Technology Corporation
    Inventor: Masahiro Kamata
  • Patent number: 8625818
    Abstract: A switch can be configured to receive a first signal at a first input and provide an output signal at an output, depending on a state of the switch. A switch state change can be delayed until an indication of a requested switch state different than a current switch state is received and the first signal reaches a threshold.
    Type: Grant
    Filed: September 9, 2010
    Date of Patent: January 7, 2014
    Assignee: Fairchild Semiconductor Corporation
    Inventors: Julie Lynn Stultz, Steven Macaluso, Enrique O. Rodriguez