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| Number | Title | Issue Date |
| 8090576 | Enhancing the intelligibility of received speech in a noisy environment A long term signal level of an audio signal is computed at a local device, wherein the audio signal was transmitted from a remote device and received by the local device. An automatic gain control (AGC) gain is computed at the local device based on the long term sig... | 01/03/2012 |
| 8086451 | System for improving speech intelligibility through high frequency compression A speech enhancement system that improves the intelligibility and the perceived quality of processed speech includes a frequency transformer and a spectral compressor. The frequency transformer converts speech signals from the time domain to the frequency domain. Th... | 12/27/2011 |
| 8073688 | Voice processing apparatus and program Envelope identification section generates input envelope data (DEVin) indicative of a spectral envelope (EVin) of an input voice. Template acquisition section reads out, from a storage section, converting spectrum data (DSPt) indicative of a frequency spectrum (SPt)... | 12/06/2011 |
| 8046217 | Geometric calculation of absolute phases for parametric stereo decoding An audio decoder which reproduces original signals from a bit stream including (i) a downmix signal of the original signals, and (ii) supplementary information indicating a gain ratio D and phase difference θ between the original signals. The audio decoder includes... | 10/25/2011 |
| 8032363 | Adaptive postfiltering methods and systems for decoding speech A method of processing a decoded speech (DS) signal including successive DS frames, each DS frame including DS samples. The method comprises: adaptively filtering the DS signal to produce a filtered signal; gain-scaling the filtered signal with an adaptive gain upda... | 10/04/2011 |
| 8024183 | System and method for addressing channel mismatch through class specific transforms A method and system for speaker recognition and identification includes transforming features of a speaker utterance in a first condition state to match a second condition state and provide a transformed utterance. A discriminative criterion is used to generate a tr... | 09/20/2011 |
| 8015001 | Signal encoding apparatus and method thereof, and signal decoding apparatus and method thereof In a signal encoding apparatus (1) a frequency normalization unit (11) normalizes each spectrum of spectral signals by using respectively normalization factors and supplies a normalization factor index per spectrum to a quantization accuracy determinin... | 09/06/2011 |
| 8010353 | Audio switching device and audio switching method that vary a degree of change in mixing ratio of mixing narrow-band speech signal and wide-band speech signal There is disclosed a speech switching device capable of improving quality of a decoded signal. In the device, a weighted addition unit outputs a mixed signal of a narrow-band speech signal and a wide-band speech signal when switching the speech signal band. A mixing... | 08/30/2011 |
| 8000961 | Gain quantization system for speech coding to improve packet loss concealment In order to recover the excitation energy quickly and keep the adaptive excitation contribution percentage in the entire excitation after bit-stream packet loss, the two excitation gains (Gp 305 and Gc 306) can be first transforme... | 08/16/2011 |
| 7962334 | Receiving device and method A receiving device receives a transmission unit signal that is sent from a sending end and accommodates a result of dividing, the result of the dividing being obtained by quantizing a value based on relative differences between a plurality of sampling values having ... | 06/14/2011 |
| 7930174 | Device and method for noise suppression An analog signal is sampled to provide a digitized signal and the resultant digitized signal is output to a delay element, which provides a delayed digital signal. The analog signal is also input to an analog noise detector, which provides a noise detector output si... | 04/19/2011 |
| 7908137 | Signal processing device, signal processing method, and program A signal processing device for processing an input signal includes gain calculating means and feature quantity calculating means. The gain calculating means is configured to obtain information indicating magnitude of noise to be added to the input signal on a basis ... | 03/15/2011 |
| 7885810 | Acoustic signal enhancement method and apparatus An acoustic signal enhancement method is disclosed. The acoustic signal enhancement method comprises the steps of applying a spectral transformation on a frame derived from an input acoustic signal to generate a spectral representation of the frame, estimating an a ... | 02/08/2011 |
| 7877253 | Systems, methods, and apparatus for frame erasure recovery In one configuration, erasure of a significant frame of a sustained voiced segment is detected. An adaptive codebook gain value for the erased frame is calculated based on the preceding frame. If the calculated value is less than (alternatively, not greater than) a ... | 01/25/2011 |
| 7831420 | Voice modifier for speech processing systems A speech converter in a speech processing system modifies various aspects of input speech. The speech converter receives a formants signal representing an input speech signal. The speech converter may also receive a formant scaling command or a user selection of one... | 11/09/2010 |
| 7805296 | Audio data processing device including a judgment section that judges a load condition for audio data transmission An audio data processing device including: a first processor; and a second processor which is connected to the first processor wherein the first processor includes: an audio data acquisition which acquires audio data of digital data; an omitting section which omits ... | 09/28/2010 |
| 7778828 | Method and system for automatic gain control of a speech signal A method and system for automatic gain control of a speech signal in a communication system are disclosed. The gain of the speech signal can be controlled, based on a calculated gain value. This gain value is calculated on the basis of energy calculation and speech ... | 08/17/2010 |
| 7774201 | Acoustic device with first and second gain setting units A purpose of the present invention is to provide an acoustic apparatus capable of automatically setting a gain which is suitable for both an averaged signal strength of input voice and an instantaneous signal strength thereof, capable of easily recognizing an effect... | 08/10/2010 |
| 7761291 | Method for processing audio-signals The invention regards a method for processing audio-signals whereby audio signals are captured at two spaced apart locations and subject to a transformation in the perceptual domain (Bar or Mel), whereupon: a) a (blind or supervised) source separation process is per... | 07/20/2010 |
| 7693711 | Speech signal decoding method and apparatus In a speech signal decoding method, information containing at least a sound source signal, gain, and filter coefficients is decoded from a received bit stream. Voiced speech and unvoiced speech of a speech signal are identified using the decoded information. Smoothi... | 04/06/2010 |
| 7630887 | Enhancing the intelligibility of received speech in a noisy environment A device receives a signal that includes human-interpretable audio information. The device automatically adjusts the volume of the audio information at the received end. The volume control is determined by an automatic volume control gain, which is calculated as a f... | 12/08/2009 |
| 7624008 | Method and device for determining the quality of a speech signal Methods and devices for objectively predicting perceptual quality of speech signals degraded in a speech processing/transporting system which may have poor prediction results for degraded signals including extremely weak or silent portions. Improvement is achieved b... | 11/24/2009 |
| 7613607 | Audio enhancement in coded domain Method and apparatus for enhancing a coded audio signal comprising indices which represent audio signal parameters which comprise at least a first parameter representing a first characteristic of speech are disclosed. A current first parameter value is determined fr... | 11/03/2009 |
| 7567898 | Regulation of volume of voice in conjunction with background sound An audio information processing system, which when incorporated in home audio video systems, provides independent volume control capability, independent equalization setting capability and independent special effects capability of voice and background sound, to the ... | 07/28/2009 |
| 7542899 | Method and apparatus for adjusting the level of a speech signal in its encoded format A method and apparatus for modifying the level of a speech signal is provided in which the gain parameter in the encoded speech signal is changed in a variable and cyclical manner over time. More specifically, a speech signal is encoded as a bit stream and the speec... | 06/02/2009 |
| 7539614 | System and method for audio signal processing using different gain factors for voiced and unvoiced phonemes In a sound reproduction or recording system an audio signal is multiplied by a gain factor (z) which is dependent on the input level (y). The dependence of the gain factor on input level is chosen such that unvoiced phonemes are at least 6 dB, preferably at least 12... | 05/26/2009 |
| 7483831 | Methods and apparatus for maximizing speech intelligibility in quiet or noisy backgrounds Methods and apparatus for maximizing speech intelligibility use psycho-acoustic variables of a model of speech perception to control the determination of optimal frequency-band specific gain adjustments. Speech signals (or other audio input) whose intelligibility is... | 01/27/2009 |
| 7454331 | Controlling loudness of speech in signals that contain speech and other types of audio material Mechanisms are known that allow receivers to control loudness of speech in broadcast signals but these mechanisms require an estimate of speech loudness be inserted into the signal. Disclosed techniques provide improved estimates of loudness. According to one implem... | 11/18/2008 |
| 7444280 | Emphasis of short-duration transient speech features A sound processor including a microphone (1), a pre-amplifier (2), a bank of N parallel filters (3), means for detecting short-duration transitions in the envelope signal of each filter channel, and means for applying gain to the outputs of these filter channels in ... | 10/28/2008 |
| 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 |
| 7428489 | Encoding method and apparatus, and decoding method and apparatus In a decoding apparatus (30), power compensation spectrum generation/composition units (371 to 374) adjust power of power compensation spectrums PCSP based on quantization accuracy information, normalization coefficients, g... | 09/23/2008 |
| 7428488 | Received voice processing apparatus A received voice processing apparatus is provided, in which the received voice processing apparatus includes: a target spectrum calculation part for calculating, for each frequency band, a target spectrum on the basis of a compression ratio for a voice spectrum; a g... | 09/23/2008 |
| 7418379 | Circuit for improving the intelligibility of audio signals containing speech The speech intelligibility of an audio signal of unchanged volume is improved by raising the total audio signal by a constant factor and lowering the amplitude of this raised signal by a high-pass filter. The corner frequency fc of the high-pass filter is... | 08/26/2008 |
| 7415117 | System and method for beamforming using a microphone array The ability to combine multiple audio signals captured from the microphones in a microphone array is frequently used in beamforming systems. Typically, beamforming involves processing the output audio signals of the microphone array in such a way as to make the micr... | 08/19/2008 |
| 7406411 | Bit error concealment methods for speech coding A system and method of concealing bit errors in a signal are provided. An exemplary method detects bit errors in an input signal having at least a current signal segment and a previous signal segment. The previous signal segment has a log-gain value qlg(m−1) and i... | 07/29/2008 |
| 7398207 | Methods and systems for determining audio loudness levels in programming An example of a method of correcting an audio level of a stored program asset comprises retrieving a stored program asset having audio encoded at a first loudness setting. Dialog of the audio of the asset is identified, a loudness of the dialog is determined and the... | 07/08/2008 |
| 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 |
| 7392177 | Method and system for reducing a voice signal noise A method is provided whereby, before being subjected to a low rate voice coding, an incoming digital voice signal is chronologically segmented into blocks, the blocks are broken down respectively, in chronological order, into frequency components by a transformation... | 06/24/2008 |
| 7383175 | Pitch adaptive equalization for improved audio A pitch adaptive circuit (200) includes an equalizer control circuit (206) that evaluates the pitch of the speech signals that are being processed and depending on the pitch information, the equalizer control circuit (206) selects an equalizer (... | 06/03/2008 |
| 7379866 | Simple noise suppression model An approach for efficiently reducing background noise from speech signal in real-time applications is presented. A noisy input speech signal is processed through an inverse filter when the spectrum tilt of the input signal is not that of a pure background noise mode... | 05/27/2008 |
