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| Number | Title | Issue Date |
| 8085953 | Audio-signal time-axis expansion/compression method and device An audio-signal time-axis expansion/compression method for subjecting an audio signal to time-axis expansion/compression at a time domain includes the steps of: cross-fade-signal generating wherein a first period and a second period which are similar within the audi... | 12/27/2011 |
| 7961896 | Expander circuit with reduced distortion Systems for an expander circuit are disclosed. An expander circuit comprising a transmit amplifier for amplifying electrical signals received from a microphone. A rectifier circuit is responsive to the electrical signals and generates a D.C. voltage. A dynamic resis... | 06/14/2011 |
| 7856108 | Method for preventing an output device from being damaged The present invention relates to a method for preventing an output device from being damaged, which comprises the steps of: dividing the output value of an output device into a plurality of areas, defining a ratio value to every area, receiving a desired output valu... | 12/21/2010 |
| 7706552 | Sound signal processing apparatus and sound signal processing method A satisfactory sound volume sensation from a hearing point of view can be obtained, and an effective sound volume correction operation can be obtained with an algorithm as simple as possible. Correction step 0 (correction function off, level correction value ... | 04/27/2010 |
| 7590251 | Clip detection in PWM amplifier Systems and methods for detecting clipping conditions in an audio signal and processing the signal to reduce the clipping conditions. In one embodiment, a system comprises a noise shaper, a modulator, an output stage and other components. A detector detects clipping... | 09/15/2009 |
| 7580531 | Dynamic range reducing volume control An audio amplifier is provided having a compressor with an automatically-adjustable compressor. Compression is linked to the volume control in an inverse relationship whereby, when the volume is reduced, the compression ratio is increased to boost the listening leve... | 08/25/2009 |
| 7558391 | Compander architecture and methods Compander architecture and method for ensuring that the components of an output signal are synchronized includes calculating a gain calculation for an input signal, detecting a predetermined condition such as a zero crossing or absence of a zero crossing within a sp... | 07/07/2009 |
| 7551745 | Volume and compression control in movie theaters A single control determines both volume and the degree of compression in the reproduction of motion picture soundtracks. For some settings of the control, compression or limiting reduces the highest levels on a movie soundtrack, leaving the dialogue level substantia... | 06/23/2009 |
| 7519189 | Processing of an audio signal for presentation in a high noise environment In accordance with the invention, audio signals are specially processed for sound presentation in a high noise environment. The electrical signal representative of the sound is first subjected to equalization to preferentially reduce the magnitude of bass signals wh... | 04/14/2009 |
| 7440577 | Methods and apparatus for automatic mixing of audio signals Methods and apparatus for automatically mixing a plurality of audio channels by adjusting respective gains of the audio channels using a control signal based on an aggregate of input levels of respective audio signals of the audio channels; and reducing the gain of ... | 10/21/2008 |
| 7430296 | Circuit arrangement for reducing the dynamic range of audio signals An audio system includes a first transformation device provided with an input audio signal and which transforms the input audio signal from the time domain to the frequency domain resulting in an input spectrum. The system also includes a spectral processing device,... | 09/30/2008 |
| 7415119 | Method for hierarchical audio conflict control A control system and associated method resolving audio conflicts. The control system comprises a computing device, a memory device comprising a database, and a plurality of audio sources. The memory device is coupled to the computing device. The database comprises i... | 08/19/2008 |
| 7403627 | Audio downmix apparatus with dynamic-range control and method for the same A method for audio downmix apparatus with dynamic-range control includes steps as follows. The procedure first calculates the power of a surround audio channel and a central audio channel and then estimates whether a gain of the surround audio channel and the centra... | 07/22/2008 |
| 7403626 | Level adjustment apparatus Arrangements are made such that a plurality of operators, such as faders, can be set to opposite operational directions. When any one of the operators has been operated in a particular direction, a control value of each of the other operator, set to the same operati... | 07/22/2008 |
| 7391875 | Peak-limiting mixer for multiple audio tracks A method for processing audio signal that includes receiving a plurality of digital audio signals and calculating signal levels of them. The next step is calculating smooth attenuation signal for each one of the input audio signals. The smooth attenuation signals ar... | 06/24/2008 |
| 7388959 | Harmonic generator and pre-amp A Harmonic Generator for audio applications and a Pre-Amplifier circuit are combined to form a Harmonic Generator and Pre-Amplifier circuit. The Harmonic Generator is formed from a Buffer Circuit responsive to an input program signal for buffering the input program ... | 06/17/2008 |
| 7373123 | Multiple tuners in a single radio receiver A radio receiver having multiple AM/FM tuners. A first tuner and a second tuner may be connected with an antenna for generating a first and second composite audio output signal. A dual input digital signal processor may be connected with the first tuner and the seco... | 05/13/2008 |
| 7369069 | Semiconductor device A semiconductor device including a clock signal generation circuit and a plurality of circuit blocks operating in synchronization with the clock signal, in which each of the plurality of the circuit blocks conducts resetting treatment receiving the interruption sign... | 05/06/2008 |
| 7369652 | Combining signals at a conference bridge Combining signals includes receiving signals from communication devices, where each signal is associated with a content describing the signal. The following is repeated for each signal: the content associated with a signal is examined, whether the signal is a voice ... | 05/06/2008 |
| 7369603 | Compensating for spectral attenuation A method and apparatus to compensate for spectral attenuation are described wherein the spectral attenuation for a communications channel is determined, a first filter is created for the attenuation and the first filter compensates for the attenuation. The spectral ... | 05/06/2008 |
| 7369906 | Digital audio signal processing A digital audio processor comprises at least one digital audio sample mapping module and produces a sequence of output digital audio sample values by applying a quasi time-invariant transfer function to each input digital audio sample value, the transfer function be... | 05/06/2008 |
| 7363096 | Digital audio signal filtering mechanism and method Essentially all of the processing parameters which control processing of a source audio signal to produce an encoded audio signal are stored in an audio processing profile. Multiple audio processing profiles are stored in a processing profile database such that spec... | 04/22/2008 |
| 7362872 | Method for noise reduction of a FM signal A compander for noise reduction of a FM signal is described, wherein a group delay (τ) linked to the generation of the compressor gain (cc(t)) is equalised during generation of the multiplex signal (m(t)), and a group delay (τ) linked to the generation ... | 04/22/2008 |
| 7352738 | Method and device for transmitting information formed of a speech part and a data part In a communication system for Internet protocol (IP)-based transmission of information formed of a speech part and a data part between interface units with a plurality of ports, the speech part and the data part are transmitted to separate ports of the receiving int... | 04/01/2008 |
| 7343019 | Streaming normalization A normalization for streaming digital audio signals applies a gain factor according to the maximum sample magnitude in a window of samples and compare the gain factor to prior gain factors to adjust the gain factor for the samples in the window of samples. Adaptatio... | 03/11/2008 |
| 7340069 | System and method for split automatic gain control A system and method for automatically controlling gain in a signal chain are presented. A first signal is processed to produce a processed signal. A gain is adjustably applied to the processed signal using an automatic gain control (AGC) mechanism. A resulting signa... | 03/04/2008 |
| 7330138 | Asynchronous sample rate correction by time domain interpolation A circuit is provided to correct a sample rate by way of time domain interpolation having a first circuit loop having an up/down counter configured to receive an input signal and a feedback signal and an adder configured to receive the output signal from the up/down... | 02/12/2008 |
| 7330554 | Volume control apparatus and method thereof A volume control apparatus and a method enable the volume of sound output from a sound output system to be adjusted in units of an increase/decrease interval set by a user, the volume control apparatus controlling the volume of sound output from the sound output sys... | 02/12/2008 |
| 7330136 | Method and device to provide arithmetic decoding of scalable BSAC audio data A method and device to arithmetically decode scalable bit sliced arithmetic coding (BSAC) audio data are provided. The arithmetic decoding method includes checking whether all side information of a last layer of the BSAC audio data is to be decoded, and performing B... | 02/12/2008 |
| 7319761 | Method and apparatus for locating and correcting sound overload The invention describes a graphical method for detecting and adjusting audio overload conditions. The graphical user interface provides a user complete playback control of several audio tracks, detection of overload conditions such as audio clipping, and graphical m... | 01/15/2008 |
| 7319770 | Method of processing an acoustic signal, and a hearing instrument A method of processing an acoustic input signal into an output signal in a hearing instrument includes converting the acoustic input signal into a converted input signal, and applying a gain to the converted input signal to obtain the output signal. According to the... | 01/15/2008 |
| 7317800 | Apparatus and method for processing an audio signal to compensate for the frequency response of loudspeakers A circuit for processing an input audio signal received at an input of the circuit provides a processed audio signal at a circuit output. The circuit includes first and second conductive paths through which the received audio signal travels. The audio signal is proc... | 01/08/2008 |
| 7305100 | Dynamic compression in a hearing aid The present invention relates to a hearing aid with a compressor having a low and gain independent delay and low power consumption. The hearing aid comprises a multi-channel compressor for compensation of dynamic range loss and with a digital input for inputting a d... | 12/04/2007 |
| 7305346 | Audio processing method and audio processing apparatus A volume adjustment unit reduces the volume of audio data. By coding the audio data where the volume is reduced in advance, the possibility of being decoded in a manner of exceeding the maximum bit number at a reproduction-side apparatus is reduced. Thus, the volume... | 12/04/2007 |
| 7302062 | Audio enhancement system An audio enhancement system for compensating for ambient noise in a listening environment, comprises an audio system that produces an electrical sound signal and generates a sound output from the electrical sound signal. A sensor (e.g., a microphone) senses a total ... | 11/27/2007 |
| 7302066 | Method for eliminating an unwanted signal from a mixture via time-frequency masking A method is presented for eliminating an unwanted signal (e.g., background music, interference, etc.) from a mixture of a desired signal and the unwanted signal via time-frequency masking. Given a mixture of the desired signal and the unwanted signal, the goal of th... | 11/27/2007 |
| 7289963 | Sound-reproducing apparatus and high frequency interpolation-processing method The invention provides a sound-reproducing apparatus and a high frequency interpolation-processing method in each of which high frequency interpolation processing having a light burden imposed thereon can be executed. Compressed audio data is decoded by a decoder ( | 10/30/2007 |
| 7286675 | Audio signal processors An audio signal processor includes a tone control (23). The tone control comprises two low-pass filters (221, 222) operating in current-mode and a subtractor (223) which subtracts the output currents of the filters to produce a band-pass charact... | 10/23/2007 |
| 7283879 | Dynamic normalization of sound reproduction A method for generating an audio output from an audio amplifier, the method consisting of receiving a segment of an input audio data stream into a buffer, identifying an adjustment interval in the segment, and calculating an average energy of at least a section of t... | 10/16/2007 |
| 7274793 | Excursion limiter An excursion limiter (10) broadly comprises a voltage controlled filter (40) to suppress an audio signal according to a selected threshold at a selected frequency using a control voltage. The voltage controlled filter (40) preferably produces an... | 09/25/2007 |
