With Amplitude Compression/expansion Patents (Class 381/106)
  • Patent number: 9496839
    Abstract: The disclosed apparatus extracts particular instrument sounds included in music in real time during music reproduction. The audio processing section 12 has an attack decision section 42 that decides attack positions of the bass drum sounds in audio signals, a bass drum sounds decision section 43 that decides sound periods of the bass drum in the audio signals, and a bass drum sounds extraction section 44 that extracts bass drum sounds using a time varying type filter for the attack positions and an adaptive type filter for the sound periods.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: November 15, 2016
    Inventors: Takashi Matsumoto, Akira Hattori, Ichiro Sugai
  • Patent number: 9462381
    Abstract: A multi-band audio compressor that may provide not only better and brighter sound, but also speaker protection. The multi-band audio compressor breaks an input audio signal into different frequency bands. For each band signal, a volume re-mapper translates a user preference volume level to a converted volume level based on a programmable volume curve for the band signal. For each frequency band, the band signal is processed by a gain stage and a compressor. Each gain stage applies a signal gain to the band signal based on the converted volume level. Each compressor compresses the output of the gain stage. After compression, the different frequency band signals are re-combined and the combined audio signal may then be passed to a power amplifier that is driving a speaker. Other embodiments are also described and claimed.
    Type: Grant
    Filed: September 24, 2014
    Date of Patent: October 4, 2016
    Assignee: Apple Inc.
    Inventors: Arvindh Krishnaswamy, Joseph M. Williams
  • Patent number: 9432789
    Abstract: A sound separation device includes: a signal obtainment unit which obtains a plurality of acoustic signals including a first acoustic signal and a second acoustic signal; a differential signal generation unit which generates a differential signal that is a signal representing a difference in a time domain between the first acoustic signal and the second acoustic signal; an acoustic signal generation unit which generates, using at least one acoustic signal among the acoustic signals, a third acoustic signal; and an extraction unit which generates a frequency signal by subtracting, from a signal obtained by transforming the third acoustic signal into a frequency domain, a signal obtained by transforming the differential signal into a frequency domain, and generates a separated acoustic signal by transforming the generated frequency signal into a time domain.
    Type: Grant
    Filed: May 12, 2014
    Date of Patent: August 30, 2016
    Inventors: Shinichi Yoshizawa, Keizo Matsumoto, Aiko Kawanaka
  • Patent number: 9406309
    Abstract: A method and apparatus are provided for generating a noise reduced output signal from sound received by a first microphone. The method includes transforming the sound received by the first microphone into a first input signal and transforming sound received by a second microphone into a second input signal. The method includes calculating, for each of a plurality of frequency components, an energy transfer function value as a real-valued quotient by dividing a temporally averaged product of an amplitude of the first input signal and the second input signal by a temporally averaged absolute square of the second input signal, calculating a gain value as a function of the calculated energy transfer function value, and generating the noise reduced output signal based on the product of the first input signal and the calculated gain value at each of the plurality of frequency components.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: August 2, 2016
    Inventor: Dietmar Ruwisch
  • Patent number: 9398362
    Abstract: An earpiece designed to fit a substantial majority (over 90%) of people without customization to the outer ears, i.e., without the need to make customized measurements or a mold of the actual ear of an individual. The device is generally C-shaped and contacts the outer ear in four locations.
    Type: Grant
    Filed: April 4, 2012
    Date of Patent: July 19, 2016
    Assignee: Blue-Gear, Inc.
    Inventors: Lawrence T. Hagen, Johan D. Carlson, Randall Wayne Roberts, Margaret V. Nilson
  • Patent number: 9331649
    Abstract: A computer-implemented method comprising: determining one or more features of a subject signal; revising one or more control signals on the basis of the one or more features; modifying a level of the subject signals based on the control signals. At least one of the features is determined by: comparing a given one of the subject signals against a boundary signal to produce a corresponding given boundary comparison signal; and summarizing the behavior of the given boundary comparison signal over a time interval.
    Type: Grant
    Filed: January 17, 2013
    Date of Patent: May 3, 2016
    Assignee: Cochlear Limited
    Inventors: Brett Anthony Swanson, Phyu Phyu Khing
  • Patent number: 9319805
    Abstract: A method of processing audio signals for an auditory prosthesis is provided. The method includes a noise reduction step and a later compression step. A gain control step is provided prior to the compression step. The gain control step operates so as to minimize the occurrence of signal compression in the compression step. An auditory prosthesis arranged to provide the method is also provided.
    Type: Grant
    Filed: April 29, 2015
    Date of Patent: April 19, 2016
    Assignee: Cochlear Limited
    Inventors: Kyriaky Griffin, Michael Goorevich
  • Patent number: 9281842
    Abstract: Improving decoding of a set of k data symbols received from several receivers, the data symbols being encoded by a systematic block error correcting code of dimension k and size n. The set of data symbols is received along with a corresponding subset of parity symbols, forming a partial data block comprising m symbols. A partial data block transmitted by one emitter, comprising a set of k data symbols and a subset of (m?k) parity symbols, is received from each receiver. For each received partial data block, a subset of parity symbols is generated and an item of reliability information is computed as a function of the received parity symbols and parity symbols generated from a received set of data symbols. The items of computed reliability information are compared with each other to select one received set of data bits.
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: March 8, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mounir Achir, Philippe Le Bars
  • Patent number: 9276544
    Abstract: A system and method is provided for converting Dynamic Range Control/Compression (DRC) gain values into a spline representation that is compatible with the current standards. The system and method may: 1) minimize the bitrate for encoding and/or 2) minimize the approximation error between reference gain and interpolation values. A strategy for bitrate minimization may be the reduction of the number of spline nodes since gain and slope information must be transmitted for each node. Accordingly, an efficient heuristics based approach is provided that reduces the number of spline nodes needed to represent a series of DRC gain values using interpolation while accounting for overshoots and other inaccuracies.
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: March 1, 2016
    Assignee: Apple Inc.
    Inventor: Frank M. Baumgarte
  • Patent number: 9257941
    Abstract: There is provided a bias arrangement for an amplifier adapted to amplify a varying input signal, the arrangement comprising a control circuit arranged to adaptively vary a bias current to the amplifier in dependence on an envelope of the varying input signal.
    Type: Grant
    Filed: November 26, 2014
    Date of Patent: February 9, 2016
    Assignee: SNAPTRACK, INC.
    Inventor: Russell Fagg
  • Patent number: 9185497
    Abstract: A method of processing a sound segment is used in a hearing aid. If the sound segment is a high-frequency type, the high-frequency portion of the sound segment will be processed with a frequency lowering process. If the sound segment is a mixed-frequency type (between high-frequency and low-frequency), the energy of at least some portion of the high-frequency portion of the sound segment will be decreased and then processed with a frequency lowering process.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: November 10, 2015
    Assignee: UNLIMITER MFA CO., LTD.
    Inventors: Vincent Shuang-Pung Liaw, Kuan-Li Chao, Neo Bob Chih-Yung Young, Kuo-Ping Yang
  • Patent number: 9178479
    Abstract: Filters 106-1-106-N divide an input signal 100 into N band-limited signals 107-1-107-N, and multipliers 108-1-108-N carry out dynamic range control of the N band-limited signals 107-1-107-N, respectively. After that, filters 111-1-111-N eliminate odd harmonics caused by the dynamic range control, and a signal synthesis unit 113 combines the signals passing through the filters 111-1-111-N into a single output signal 114.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: November 3, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masaru Kimura, Hirohisa Tasaki
  • Patent number: 9143104
    Abstract: An audio signal processing circuit includes a first amplifier to generate a first analog audio signal; a second amplifier to generate a second analog audio signal; an analog/digital converter to generate a first digital audio signal; a digital signal processing unit to output a second digital audio signal; a digital/analog converter to generate differential third analog audio signals; a third amplifier for inverting a positive signal of the third analog audio signals and adding it to a negative signal to generate a single-ended fourth analog audio signal; and a fourth amplifier to generate an output audio signal.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: September 22, 2015
    Assignee: ROHM CO., LTD.
    Inventor: Mitsuteru Sakai
  • Patent number: 9054662
    Abstract: An automatic audio signal level adjustment circuit is capable of automatically adjusting a level of an input audio signal within a specific range. The automatic audio signal level adjustment circuit includes an amplitude adjustment determining unit and an amplitude adjusting unit. The amplitude adjustment determining unit is configured to generate an amplitude reduction instruction when the level is greater than a first reference value, and an amplitude augmentation instruction when the level is small than a second reference value. The amplitude adjusting unit is configured to output an output audio signal having an amplitude reduced from that of the input audio signal upon the amplitude reduction instruction, and an output audio signal having an amplitude augmented from that of the input audio signal upon the amplitude augmentation instruction. Further, the amplitude adjusting unit is configured to output an output audio signal equal to the input audio signal upon no instruction.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: June 9, 2015
    Inventor: Koya Shimazaki
  • Patent number: 9046910
    Abstract: A constant current generation circuit of the invention includes: a temperature variable voltage generation unit that generates a first variation voltage whose voltage value fluctuates with temperature; a variation gradient adjustment unit that generates a second variation voltage based on a reference voltage smaller in the amount of variation with temperature than the first variation voltage and the first variation voltage; and a current generation unit that includes a current setting resistor whose resistance value fluctuates with temperature and generates an output current based on the second variation voltage and the current setting resistor. The variation gradient adjustment unit sets the coefficient of variation with temperature of the second variation voltage so that the difference between it and the coefficient of variation with temperature of the resistance value of the current setting resistor is within a preset first stipulated range.
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: June 2, 2015
    Assignee: Renesas Electronics Corporation
    Inventors: Kazutoshi Sako, Tomokazu Matsuzaki
  • Publication number: 20150110294
    Abstract: A novel audio ducking method that is aware of the loudness levels of the audio content is provided. The method specifies a minimum loudness separation between audio tracks that are designated as masters and audio tracks that are designated as slaves. The method attenuates the volume of the slave tracks in order to provide at least the minimum loudness separation between the slave tracks and the master tracks. The amount of attenuation for a slave is determined based on the loudness levels of the slave and of a master.
    Type: Application
    Filed: October 18, 2013
    Publication date: April 23, 2015
    Applicant: APPLE INC.
    Inventors: David N. Chen, David E. Conry
  • Patent number: 9008326
    Abstract: The performance of an echo canceller is assessed using a) a test signal launched from originating test equipment and b) a simulated echo of the test signal launched from terminating test equipment. The launch of the simulated echo signal is timed in such a way that it arrives at the tandem echo canceller(s) at a particular point in time relative to the arrival of the test signal, at the tandem echo canceller(s), when the tandem echo canceller(s) is (are) not able to cancel the simulated echo signal. The latter thus arrives uncanceled at the target echo canceller. The launch of the simulated echo signal is further timed in such a way that it arrives at the target echo canceller at a point in time relative to the arrival of the test signal, at the target echo canceller, when the target echo canceller is able to cancel the simulated echo signal.
    Type: Grant
    Filed: October 15, 2012
    Date of Patent: April 14, 2015
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: James H. James, Wallace F. Smith, Jr.
  • Patent number: 9002033
    Abstract: Systems and methods for amplitude compressing a digital signal. An input signal is divided into frames having a first and second sets of samples. The samples in the second set are also in a subsequent frame. Peak values are determined for the first and second sets. One or more slopes are calculated based on the peak values. The slopes are used to define a scale factor which is applied to the first set to produce the output signal. For example, if the first peak value exceeds an amplitude threshold, first and last samples in the first set to exceed the amplitude threshold are found. Slopes are calculated for each of three regions of the first set demarcated by the first and last samples. In each region a slope is selected. These slopes along with an initial scale factor are used to calculate the scale factor.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: April 7, 2015
    Assignee: Analog Devices, Inc.
    Inventor: Mohammed Chalil
  • Patent number: 8989405
    Abstract: A first differential value is acquired between first current data and first previous data in an i number (i being a natural number) of sampling periods before the current data. A second differential value is acquired between second current data and second previous data in a j number (j being a natural number) of sampling periods before the current data. Both first data and both second data are of a first and a second digital audio signal, respectively, having a sound level of a digital stereo audio signal in the left and right channels, respectively. A first and a second correction coefficient are acquired by adding the first and second differential values at a first and a second ratio, respectively. The first signal is corrected by multiplying the first signal by the first correction coefficient. The second signal is corrected by multiplying the second signal by the second correction coefficient.
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: March 24, 2015
    Assignee: JVC KENWOOD Corporation
    Inventor: Masami Nakamura
  • Patent number: 8989406
    Abstract: Embodiments are directed toward user profile based audio adjustment techniques. The techniques are used to render various audio and/or audio/video content having different audio output parameter values in accordance with a user profile that characterizes a user's desired value and/or range of one or more of the output parameter levels.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: March 24, 2015
    Assignees: Sony Corporation, Sony Network Entertainment International LLC
    Inventors: Ling Jun Wong, True Xiong
  • Patent number: 8983092
    Abstract: Peak reduction and power limitations are used to prevent distortion and protect components. In a cellular telephone, peak reduction can be based on battery power level to prevent electrical distortion from saturation. In addition peak reduction can be used to prevent mechanical distortion such as rub and buzz. Dynamic range compression can be used for peak reduction. In another application dynamic range compression can be used to control the power output to protect a speaker from damage. One example of a dynamic range compressor/peak limiter comprises a look-ahead buffer and an analysis engine. For example, the look-ahead buffer holds a window of samples of a signal. The analysis engine selects a gain envelope function on the basis of the samples, for example, by selecting the Pth sample in the buffer whenever that sample exceeds a given threshold.
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: March 17, 2015
    Assignee: Conexant Systems, Inc.
    Inventors: Trausti Thormundsson, Govind Kannan, Shlomi I. Regev, James W. Wihardja, Yair Kerner, Harry K. Lau, Ragnar H. Jonsson
  • Patent number: 8965774
    Abstract: For a media clip that includes audio content, a novel method for performing dynamic range compression of the audio content is presented. The method performs an analysis of the audio content. Based on the analysis of the audio content, the method generates a setting for an audio compressor that compresses the dynamic range of the audio content. The generated setting includes a set of audio compression parameters that include a noise gating threshold parameter (“noise gate”), a dynamic range compression threshold parameter (“threshold”), and a dynamic range compression ratio parameter (“ratio”).
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: February 24, 2015
    Assignee: Apple Inc.
    Inventor: Aaron M. Eppolito
  • Patent number: 8965756
    Abstract: Systems and methods to automatically equalize coloration in speech recordings is provided. In example embodiments, a reference spectral shape based on a reference signal is determined. An estimated spectral shape for an input signal is derived. Using the estimated spectral shape and the reference spectral shape a comparison is performed to determine gain settings. The gain settings comprise a gain value for each filter of a filter system. Using gain values associated with the gain setting, automatic equalization is performed on the input signal.
    Type: Grant
    Filed: March 14, 2011
    Date of Patent: February 24, 2015
    Assignee: Adobe Systems Incorporated
    Inventors: Sven Duwenhorst, Martin Schmitz
  • Patent number: 8964998
    Abstract: The present invention features systems for dynamically adjusting audio signals by applying a gain to the signal in a spectrally varying manner to compensate for ambient noise, such that the sound is perceived to be unchanged in volume and spectral composition by the listener. The system obtains a threshold elevation for each frequency component by analyzing the spectral composition of the ambient noise. This threshold elevation is then used by a psychoacoustic model of hearing to determine an appropriate gain adjustment for the corresponding frequency component of the source signal which will make that source signal perceived by the human ear to be just as loud as if the noise were not present.
    Type: Grant
    Filed: June 7, 2012
    Date of Patent: February 24, 2015
    Assignee: Sound Enhancement Technology, LLC
    Inventor: David McClain
  • Patent number: 8942391
    Abstract: A distortion compensation system minimizes distortion in an audio system by monitoring a supply voltage and adjusting a clipping threshold and/or compression knee. An adjustable gain circuit controls the gain of the audio signal according whether the audio signal exceeds a variable threshold. The variable threshold is adjusted within a threshold range based on the supply voltage. Distortion due to clipping of the audio signal is minimized while available power at any given time is maximized.
    Type: Grant
    Filed: September 9, 2011
    Date of Patent: January 27, 2015
    Assignee: Harman International Industries, Incorporated
    Inventor: Kenneth Carl Furge
  • Patent number: 8934643
    Abstract: An apparatus for generating a drive signal for a sound transducer (109) comprises a sound generator (101) which provides an input audio signal. A divider (101) divides the input audio signal into at least a low frequency signal and a high frequency signal and an expander (105) generates an expanded signal by applying a dynamic range expansion to the low frequency signal. A combiner (107) then generates the drive signal by combining the expanded signal and the higher frequency signal. The threshold for applying the dynamic range extension may be adjusted depending on the amplitude of the low frequency signal. The low frequency signal may furthermore be compressed into a narrow frequency band around a resonance frequency. The approach may allow improved audio quality especially from high Q low frequency sound transducers by attenuating decay parts of bass signals thereby reducing sustain or ringing for bass notes.
    Type: Grant
    Filed: April 3, 2009
    Date of Patent: January 13, 2015
    Assignee: Koninklijke Philips N.V.
    Inventors: Ronaldus Maria Aarts, Thomas Pieter Jan Peeters
  • Patent number: 8924220
    Abstract: In a multiband compressor 100, a level calculation unit 121 calculates a signal level inputted for each of bands, a gain calculation unit 122 calculates a gain value from the calculated signal level, and a gain limitation unit 130 limits a gain value by comparison with a gain value of the other band in a compressor for each band. With this configuration, provided is a multiband compressor capable of achieving a balance between the quality of sound and the effect of enhancing the sound level at a high level.
    Type: Grant
    Filed: September 7, 2010
    Date of Patent: December 30, 2014
    Assignee: Lenovo Innovations Limited (Hong Kong)
    Inventor: Satoshi Hosokawa
  • Patent number: 8917886
    Abstract: An audio signal in which an audio signal is received as a stream of digital samples, each being a numerical value representing a sampled signal level. A first zero crossing point is identified and the received audio samples are stored until a second zero crossing point is identified, thereby storing a first half-wave of samples. The highest intensity sample is identified from the stored samples and this is compared against a predetermined threshold. All stored samples are scaled by an initial scaling factor so that the intensity of the highest intensity sample is not above this threshold. A second half-wave of samples is stored in which all samples of the second half-wave are below the threshold. All stored samples of the second half-wave are also scaled but by a modified scaling factor derived from a combination of the initial scaling factor and a decay factor.
    Type: Grant
    Filed: May 5, 2012
    Date of Patent: December 23, 2014
    Assignee: Red Lion 49 Limited
    Inventor: Craig Nicholas Grove
  • Patent number: 8913754
    Abstract: The present invention features systems for adjusting audio signals by applying a gain to the signal in a spectrally varying manner to compensate for ambient noise in the environment of the listener. The system allows a listener to hear what ought to be heard, over the ambient noise, by applying a gain to the source that varies according to the spectral composition of the noise, rather than cancelling or filtering the noise. The spectral composition of the source is thus preserved in the listener's awareness without the removal of the noise signal. After application of these corrective gains to the source, the listener's perception of the source sound is as if the noise was not present. Systems may be incorporated into apparatuses including but not limited to mobile phones and music players.
    Type: Grant
    Filed: June 5, 2012
    Date of Patent: December 16, 2014
    Assignee: Sound Enhancement Technology, LLC
    Inventor: David McClain
  • Patent number: 8908881
    Abstract: A sound signal processing device that is capable of suitably extracting main sound from mixed sound in which unnecessary sound (for example, leakage sound and reverberant sound) is mixed with the main sound. More specifically, a mixed sound signal in the time domain including first sound and second sound, and a target sound signal in the time domain including sound corresponding to at least the second sound, which have temporal relation in their entirety or in part, are each divided into a plurality of frequency bands. A level ratio between the two signals is calculated at each frequency. Based on the level ratio, a signal of the first sound that is included in the mixed sound signal is extracted.
    Type: Grant
    Filed: August 11, 2011
    Date of Patent: December 9, 2014
    Assignee: Roland Corporation
    Inventor: Kenji Sato
  • Patent number: 8908872
    Abstract: The disclosed BTSC encoder includes a left high pass filter means for receiving a digital left channel audio signal and for digitally high pass filtering the digital left channel audio signal and thereby generating a digital left filtered signal; a right high pass filter means for receiving a digital right channel audio signal and for digitally high pass filtering the digital right channel audio signal and thereby generating a digital right filtered signal; a matrix means for receiving the digital left and digital right filtered signals, and including means for summing the digital left and digital right filtered signals and thereby generating a digital sum signal, and including means for subtracting one of the digital left and digital right filtered signals from the other of the digital left and digital right filtered signals and thereby generating a digital difference signal; a difference channel processing means for digitally processing the digital difference signal; and a sum channel processing means for d
    Type: Grant
    Filed: June 2, 2006
    Date of Patent: December 9, 2014
    Assignee: THAT Corporation
    Inventor: Christopher M. Hanna
  • Patent number: 8892450
    Abstract: The application describes a method and an apparatus to prevent clipping of an audio signal when protection against signal clipping by received audio metadata is not guaranteed. The method may be used to prevent clipping for the case of downmixing a multichannel signal to a stereo audio signal. According to the method, it is determined whether first gain values (4) based on received audio metadata are sufficient for protection against clipping of the audio signal. The audio metadata is embedded in a first audio stream (1). In case a first gain value (4) is not sufficient for protection, the respective first gain value (4) is replaced with a gain value sufficient for protection against clipping of the audio signal. Preferably, in case no metadata related to dynamic range control is present in the first audio stream (1), the method may add gain values sufficient for protection against signal clipping.
    Type: Grant
    Filed: October 26, 2009
    Date of Patent: November 18, 2014
    Assignee: Dolby International AB
    Inventors: Wolfgang A. Schildbach, Alexander Groeschel
  • Patent number: 8880205
    Abstract: Integrated processing of multimedia signals can eliminate unnecessary signal processors and converters without losing the functionality of typical home entertainment system components. The integrated multimedia system includes a main player that captures and processes signals digitally. The main player may adjust the audio signal to provide audio output of equal loudness across all frequencies by accounting for sensitivity of the human ear for sounds of varying frequencies. The main player can also account for perceived differences in loudness based on the angle of a listener to a speaker by detecting the position of a user and making an adjustment accordingly. The invention further provides a speaker that has embedded performance characteristics or an identifier that allows the system to provide an optimal speaker driving current for a particular system or determine how that speaker would be best implemented in the integrated system.
    Type: Grant
    Filed: August 16, 2005
    Date of Patent: November 4, 2014
    Assignee: Mondo Systems, Inc.
    Inventor: Chul Chung
  • Patent number: 8879750
    Abstract: There are provided methods and an apparatus for conditioning an audio signal. According to one aspect of the present invention there is included a method for conditioning an audio signal having the steps of: receiving at least one audio signal, each audio signal having at least one channel, each channel being segmented into a plurality of frames over a series of time; calculating at least one measure of dynamic excursion of the audio signal for a plurality of successive segments of time; filtering the audio signal into a plurality of subbands, each frame being represented by at least one subband; deriving a dynamic gain factor from the successive segments of time; analyzing at least one subband of the frame to determine if a transient exists in the frame; and applying the dynamic gain factor to each frame having a transient.
    Type: Grant
    Filed: October 8, 2010
    Date of Patent: November 4, 2014
    Assignee: DTS, Inc.
    Inventors: Martin Walsh, Edward Stein, Jean-Marc Jot
  • Patent number: 8873772
    Abstract: The present invention relates to a process for adjusting the sound volume of a digital sound recording characterized in that it comprises: a step consisting of determining, in absolute values, for a recording, the maximum amplitude values for sound frequencies audible for the human ear, a step consisting of calculating the possible gain for a specified sound level setting, between the maximum amplitude value determined above and the maximum amplitude value for all frequencies combined, a step consisting of reproducing the recording with a sound card by automatically adjusting the amplification gain level making it possible to obtain a sound level for the recording of a specified value so that it corresponds to the gain calculated for this recording.
    Type: Grant
    Filed: March 19, 2012
    Date of Patent: October 28, 2014
    Assignee: TouchTunes Music Corporation
    Inventors: Guy Nathan, Dominique Dion
  • Patent number: 8873763
    Abstract: This invention discloses a method and a plurality of compressive amplitude distortion units for enhancing the perceptibility of the low-frequency portion of a sound by introducing residue harmonics of low-frequency signal components into the sound, where the residue harmonics are generated by a nonlinear function emulating the middle-ear response of a human being. The low-frequency portion in the resultant sound is perceivable to a human listener even if this portion is removed from this sound.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: October 28, 2014
    Inventor: Wing Hon Tsang
  • Patent number: 8867753
    Abstract: An apparatus for upmixing a downmix audio signal describing one or more downmix audio channels into an upmixed audio signal describing a plurality of upmixed audio channels includes an upmixer configured to apply temporally variable upmixing parameters to upmix the downmix audio signal in order to obtain the upmixed audio signal. The apparatus also includes a parameter interpolator, wherein the parameter interpolator is configured to obtain one or more temporally interpolated upmix parameters to be used by the upmixer on the basis of a first complex-valued upmix parameter and a subsequent second complex-valued upmix parameter.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: October 21, 2014
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V..
    Inventors: Matthias Neusinger, Julien Robilliard, Johannes Hilpert
  • Patent number: 8868414
    Abstract: An audio signal processing device is designed to enhance the low-pitch register of an audio signal by generating harmonics causing a missing fundamental effect with a light load of processing but without damaging an audio waveform. The audio signal processing device includes a filtering part (e.g. a band-pass filter configured of a high-pass filter and a low-pass filter) that extracts a low-pitch signal from an audio signal input thereto; a dynamic range compression part that compresses a dynamic range of the low-pitch signal by use of a time-variant gain relative to a peak of the low-pitch signal, which is detected via a peak hold operation using a predetermined time constant, thus producing a compressed signal; and an adder that adds the compressed signal to the audio signal so as to produce a processed audio signal including harmonics.
    Type: Grant
    Filed: January 18, 2012
    Date of Patent: October 21, 2014
    Assignee: Yamaha Corporation
    Inventors: Ryotaro Aoki, Hideyuki Tokuhisa
  • Patent number: 8861747
    Abstract: The application relates to a compressor circuit for a listening device, the compressor circuit comprising a pair of input terminals and a pair of output terminals, the compressor circuit being adapted for receiving an electric input signal representing an audio signal with an input voltage swing Vipp at the input terminals and for providing a possibly compressed version of the input signal as an output signal with an output voltage swing Vopp at the output terminals, the compressor circuit comprising. The application further relates to a listening device and to the use of the compressor circuit. The object of the present application is to provide a compressor circuit with a proper functioning also at relatively low input levels.
    Type: Grant
    Filed: June 23, 2011
    Date of Patent: October 14, 2014
    Assignee: Senheiser Communications A/S
    Inventors: Ole N. Christensen, Niels C. S. Hansen
  • Patent number: 8855322
    Abstract: An original loudness level of an audio signal is maintained for a mobile device while maintaining sound quality as good as possible and protecting the loudspeaker used in the mobile device. The loudness of an audio (e.g., speech) signal may be maximized while controlling the excursion of the diaphragm of the loudspeaker (in a mobile device) to stay within the allowed range. In an implementation, the peak excursion is predicted (e.g., estimated) using the input signal and an excursion transfer function. The signal may then be modified to limit the excursion and to maximize loudness.
    Type: Grant
    Filed: August 9, 2011
    Date of Patent: October 7, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Sang-Uk Ryu, Jongwon Shin, Roy Silverstein, Andre Gustavo P. Schevciw, Pei Xiang
  • Patent number: 8848928
    Abstract: Automatic measurements are made of audio presence and level in an audio signal by direct processing of an MPEG data stream representing the audio signal, without reconstructing the audio signal. Sub-band data is extracted from the data stream, and the extracted sub-band data is dequantized and denormalized. An audio level for the dequantized and denormalized sub-band data is measured without reconstructing the audio signal. Channel characteristics are used in measuring the audio level of the sub-band data, wherein the channel characteristics are used to weight the measured levels. The measured levels are compared against at least one threshold to determine whether an alarm should be triggered.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: September 30, 2014
    Assignee: The DIRECTV Group, Inc.
    Inventors: Thomas H. James, Jeffrey D. Carpenter
  • Patent number: 8842852
    Abstract: An input audio signal is detected to provide a fast time constant control signal which is clamped for immediate response when the input signal drops below a threshold level and filtered to provide a modified control signal with a slow time constant. As the modified control signal level decreases toward the control signal level, a time constant differential control signal decreases and slows the rate of change of the decreasing modified control signal which, as it nears the control signal level, reverts to a slow response. The resulting control signal has an exponential release response which can be applied to an audio dynamics processor. The time constant differential control signal may also be detected to provide an inverted output when it is significantly less than the modified control signal so as to result in the control signal also having an exponential attack response to be applied to the processor.
    Type: Grant
    Filed: July 28, 2011
    Date of Patent: September 23, 2014
    Inventor: James K. Waller, Jr.
  • Patent number: 8831245
    Abstract: A method for modifying a current sound-volume value assigned by an on-board system to an acoustic alert signal emitted on board an aircraft is provided. The method includes furnishing, on board the aircraft, the on-board system with at least one information item defining a modification of the current sound-volume value to a new sound-volume value in accordance with a predetermined rule.
    Type: Grant
    Filed: March 28, 2008
    Date of Patent: September 9, 2014
    Assignees: Airbus Operations SAS, Airbus
    Inventors: Nicolas Fabas, Baptiste Maylin
  • Publication number: 20140205112
    Abstract: A method of extending battery life of a wireless microphone unit includes muting the wireless microphone unit responsive to a mute signal from a base station unit, transmitting, by the wireless microphone unit, compressed muted audio data, wherein the compressed muted audio data is compressed via a first compression scheme, determining, by the wireless microphone unit, whether an unmute signal has been received from the base station unit, and responsive to a determination that the unmute signal has been received, unmuting the wireless microphone unit. The method further includes discontinuing transmission of the compressed muted audio data and transmitting compressed audio data via a second compression scheme, wherein the first transmitting step causes the wireless microphone unit to consume less power per unit of transmission time than the second transmitting step.
    Type: Application
    Filed: March 25, 2014
    Publication date: July 24, 2014
    Applicant: Enforcement Video, LLC
    Inventor: Andrew Cilia
  • Patent number: 8767980
    Abstract: A microphone can include a capacitor capsule, an output buffer amplifier connected to the output of the capacitor capsule, and an audio limiter connected to the output of the output buffer amplifier, wherein the audio limiter limits the output level of the microphone at a threshold level. The microphone can include an adjustable output level. The microphone can include an integrated high-pass filter. The microphone can have an omnidirectional polar pattern.
    Type: Grant
    Filed: March 22, 2011
    Date of Patent: July 1, 2014
    Assignee: CAD Audio, LLC
    Inventor: Kelly Statham
  • Patent number: 8761406
    Abstract: An audio signal processing device includes: a microphone configured to collect noise; an analyzing unit configured to analyze an audio signal collected by the microphone to detect the level and frequency property of the collected audio signal; and a signal processing unit configured to subject an audio signal to be reproduced to signal processing based on the analysis results of the analyzing unit.
    Type: Grant
    Filed: June 16, 2009
    Date of Patent: June 24, 2014
    Assignee: Sony Corporation
    Inventors: Kazunobu Ohkuri, Kohei Asada, Shiro Suzuki, Tetsunori Itabashi, Hiroki Kawanishi
  • 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: 8755530
    Abstract: A method for multi-channel processing in a multi-channel sound system, in which a channel or a channel mixture is first split into individual channels, the individual channels are limited by setting the values of the parameters channel fader, threshold, release, and output level and then encoding the individual channels. At least two channels are compressed and/or limited with a uniform output level value in method step, one channel is provided with a deviating output level value, which is set, depending on the audio material to be processed, and every further channel is compressed and/or limited in such a manner that it has an output level value that is at least one decibel less than the uniform output level value. The individual channels are combined into an encoded (coded) channel by setting a value of at least one of the parameters channel fader, threshold, release, and output level.
    Type: Grant
    Filed: December 29, 2008
    Date of Patent: June 17, 2014
    Assignee: Kronoton GmbH
    Inventor: Gunnar Kron
  • Patent number: 8744091
    Abstract: A communications device is configured to control the intelligibility of speech in a downlink voice signal during a call. The device determines a current noise level based on sampling ambient acoustic noise and based on a previously determined noise level. The device then determines an overall output gain and a frequency response based on the current noise level and based on a user-selected volume setting of the device. The device modifies the downlink voice signal during the call in accordance with the determined overall output gain and the determined frequency response. Other embodiments are also described and claimed.
    Type: Grant
    Filed: November 12, 2010
    Date of Patent: June 3, 2014
    Assignee: Apple Inc.
    Inventors: Shaohai Chen, Guy C. Nicholson, Bruce C. Po
  • Patent number: 8737644
    Abstract: A reproducing apparatus includes: a digital signal processing block configured to execute first boost processing for setting a volume level for an entered digital audio signal and boosting an amplitude level of the signal; a digital-to-analog conversion block configured to convert the digital audio signal into an analog one; an analog signal processing block configured to execute second boost processing for boosting an amplitude level of the analog audio signal; an analog volume adjusting block configured to set a volume level for the analog audio signal from the analog signal processing block; a loudspeaker configured to output the analog audio signal from the analog volume adjusting block; an operating block configured to indicate a volume level of an audio signal from the loudspeaker and turn on/off the boost processing for the audio signals; and a control block configured to control components in accordance with an operation by the operating block.
    Type: Grant
    Filed: May 13, 2009
    Date of Patent: May 27, 2014
    Assignee: Sony Corporation
    Inventor: Yasuyuki Kino