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7391877 |
Spatial processor for enhanced performance in multi-talker speech displays
Optimal head related transfer function spatial configurations designed to maximize speech intelligibility in multi-talker speech displays by spatially separating competing speech channels combined...
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7383297 |
Method to use acoustic signals for computer communications
A method of communicating with an electronic device, comprising: providing a computer having an audible sound receiving and generating sub-system including a microphone; transmitting from a source...
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7376553 |
Fractal harmonic overtone mapping of speech and musical sounds
An apparatus for signal processing based on an algorithm for representing harmonics in a fractal lattice. The apparatus includes a plurality of tuned segments, each tuned segment including a...
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7373293 |
Quantization noise shaping method and apparatus
A method and apparatus for shaping quantization noise generated when compressing audio data at a low bit rate is disclosed. A predetermined quantization noise threshold allowed during quantization...
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7366656 |
Method apparatus and system for processing acoustic signals
A method of identifying patterns in a digitized acoustic signal is disclosed. The method comprises: (i) converting the digitized acoustic signal into a spatial representation being defined by a...
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RE40280 |
Rate loop processor for perceptual encoder/decoder
A method and apparatus for quantizing audio signals is disclosed which advantageously produces a quantized audio signal which can be encoded within an acceptable range. Advantageously, the...
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7356748 |
Partial spectral loss concealment in transform codecs
The invention concerns a frequency-domain error concealment technique for information that is represented, on a frame-by-frame basis, by coding coefficients. The basic idea is to conceal an...
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7356464 |
Method and device for estimating signal power in compressed audio using scale factors
Estimating a signal power in a compressed audio signal [A] is provided, the audio signal comprising blocks of quantized samples, a given block being provided with a set of scale factors. The...
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7346517 |
Method of inserting additional data into a compressed signal
Many compressed audio or video frames contain silence (if audio), or a blank image (if video); these essentially information content free (e.g. silent if audio or blank if video) frames can be both...
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7346514 |
Device and method for embedding a watermark in an audio signal
Prior to embedding a watermark in an audio signal, a spectral representation of the audio signal and a spectral representation of the watermark signal are determined. The spectral representation of...
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7343287 |
Method and apparatus for scalable encoding and method and apparatus for scalable decoding
An apparatus for scalable encoding a spectrum of a signal including audio and/or video information, with the spectrum comprising binary spectral values, includes a means for generating a first...
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7340391 |
Apparatus and method for processing a multi-channel signal
An apparatus for processing a multi-channel signal includes a means for determining a similarity between a first one of two channels and a second one of the two channels. Furthermore, a means for...
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7333930 |
Tonal analysis for perceptual audio coding using a compressed spectral representation
The present invention provides an apparatus, method and tangible medium storing instructions for determining tonality of an input audio signal, for selection of corresponding masked thresholds for...
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7333929 |
Modular scalable compressed audio data stream
Methods and apparatus are provided for the creation and utilization of unique compressed data stream compositions, structures and formats which allow for the alteration of the data stream's data...
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7330812 |
Method and apparatus for transmitting an audio stream having additional payload in a hidden sub-channel
Methods and apparatus are provided for communicating an audio stream. A perceptual mask is estimated for an audio stream, based on the perceptual threshold of the human auditory system. A hidden...
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7328151 |
Audio decoder with dynamic adjustment of signal modification
Methods and devices for dynamically adjusting a multi-band signal-modification profile based on a psychoacoustic model are disclosed. In one arrangement, the encoding parameter side information is...
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7318027 |
Conversion of synthesized spectral components for encoding and low-complexity transcoding
In an audio coding system, an encoding transmitter represents encoded spectral components as normalized floating-point numbers. The transmitter provides first and second control parameters that may...
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7315812 |
Method for determining the quality of a speech signal
Objective measurement methods and devices for predicting perceptual quality of speech signals degraded in speech processing/transporting systems have unreliable prediction results in cases where...
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7313520 |
Adaptive variable bit rate audio compression encoding
An adaptive variable bit rate audio encoder and method that examines audio level information and detects various information in the audio data in a psychoacoustic model to create a quantization...
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7308403 |
Compensation for utterance dependent articulation for speech quality assessment
A method for objective speech quality assessment that accounts for phonetic contents, speaking styles or individual speaker differences by distorting speech signals under speech quality assessment....
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7305341 |
Method of reflecting time/language distortion in objective speech quality assessment
Disclosed is an objective speech quality assessment technique that reflects the impact of distortions which can dominate overall speech quality assessment by modeling the impact of such distortions...
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7299190 |
Quantization and inverse quantization for audio
An audio encoder and decoder use architectures and techniques that improve the efficiency of quantization (e.g., weighting) and inverse quantization (e.g., inverse weighting) in audio coding and...
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7280959 |
Indexing pulse positions and signs in algebraic codebooks for coding of wideband signals
The indexing method comprises forming a set of tracks of pulse positions, restraining the positions of the non-zero-amplitude pulses of the combinations of the codebook in accordance with the set...
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7275036 |
Apparatus and method for coding a time-discrete audio signal to obtain coded audio data and for decoding coded audio data
A time-discrete audio signal is processed to provide a quantization block with quantized spectral values. Furthermore, an integer spectral representation is generated from the time-discrete audio...
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7275031 |
Apparatus and method for encoding an audio signal and apparatus and method for decoding an encoded audio signal
When encoding an audio signal, the audio signal is first encoded with the first encoder to obtain a first encoder output signal. This first encoder output signal is written into a bit stream. It is...
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7272566 |
Reducing scale factor transmission cost for MPEG-2 advanced audio coding (AAC) using a lattice based post processing technique
A perceptual encoder divides an audio signal into successive time blocks, each time block is divided into frequency bands, and a scale factor is assigned to each of ones of the frequency bands....
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7269564 |
Method and apparatus to indicate an encoding status for digital content
A method of determining an encoding rate for digital content. According to the method, the a sample of the content data is encoded for a predetermined period of time. The encoding rate is...
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7269554 |
Method, apparatus, and system for efficient rate control in audio encoding
According to one aspect of the invention, a method is provided in which audio samples representing an input audio signal are received. The input audio samples are transformed into a vector of...
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7263481 |
Method and apparatus for improved quality voice transcoding
A method and apparatus for a voice transcoder that converts a bitstream representing frames of data encoded according to a first voice compression standard to a bitstream representing frames of...
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7249016 |
Quantization matrices using normalized-block pattern of digital audio
Quantization matrices facilitate digital audio encoding and decoding. An audio encoder generates and compresses quantization matrices; an audio decoder decompresses and applies the quantization...
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7248708 |
Noise canceling microphone
An improved noise canceling microphone is provided including robust design features and advanced noise control and speech discrimination convergence characteristics. Two adaptive controllers are...
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7225123 |
Method for compressing audio signal using wavelet packet transform and apparatus thereof
An audio compression method using wavelet packet transform (WPT) in MPEG1 layer 3 (hereinafter referred to as “MP3”) and a system thereof are provided. The method comprises calculating...
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7222068 |
Audio signal encoding method combining codes having different frame lengths and data rates
A system for transmitting audio signals over a telecommunications link generates the signals as two or more alternative feeds, for example at different data rates. The two feeds are encoded using...
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7219065 |
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...
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7197452 |
Multimodal quality assessment
The quality of audiovisual material is assessed by measuring the audio an video quality and computing from these a combined measure. Using a parameter indicative of the degree of motion represented...
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7188065 |
Categorizer of content in digital signals
Described herein is a technology for facilitating the recognition and categorization of the content of digital signals. This abstract itself is not intended to limit the scope of this patent. The...
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7184961 |
Frequency thinning device and method for compressing information by thinning out frequency components of signal
A device and a method for compressing signal information by removing (thinning out) the signal component of a signal in a specific frequency band. Firstly, an input time-series signal (e.g., a PCM...
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7181404 |
Method and apparatus for audio compression
A method and apparatus for audio compression receives an audio signal. Transform coding is applied to the audio signal to generate a sequence of transform frequency coefficients. The sequence of...
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7165025 |
Auditory-articulatory analysis for speech quality assessment
Auditory-articulatory analysis for use in speech quality assessment. Articulatory analysis is based on a comparison between powers associated with articulation and non-articulation frequency ranges...
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7164771 |
Process and system for objective audio quality measurement
A process and system for providing objective quality measurement of a target audio signal. Reference and target signals are processed by a peripheral ear processor, and compared to provide a...
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7158933 |
Multi-channel speech enhancement system and method based on psychoacoustic masking effects
The present invention is generally directed to a system and method for enhancing speech using a multi-channel noise filtering process that is based on psychoacoustic masking effects. A speech...
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7146313 |
Techniques for measurement of perceptual audio quality
An audio processing tool measures the quality of reconstructed audio data. For example, an audio encoder measures the quality of a block of reconstructed frequency coefficient data in a...
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7143047 |
Time-scale modification of data-compressed audio information
A data-compressed audio waveform is temporally modified without requiring complete decompression of the audio signal. Packets of compressed audio data are first unpacked, to remove scaling that was...
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7136492 |
Visual or audio playback of an audiogram
A method for the visualization of the hearing capacity of a person. As a function of audiogram data, text is modified in any of several characteristics, including brightness, contrast, sharpness,...
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7117146 |
System for improved use of pitch enhancement with subcodebooks
A speech compression system capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech is disclosed. The speech compression system optimizes the...
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7117145 |
Adaptive filter for speech enhancement in a noisy environment
A cabin communication system for improving clarity of a voice spoken within an interior cabin having ambient noise includes a microphone for receiving the spoken voice and the ambient noise and for...
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7110953 |
Perceptual coding of audio signals using separated irrelevancy reduction and redundancy reduction
A perceptual audio coder is disclosed for encoding audio signals, such as speech or music, with different spectral and temporal resolutions for redundancy reduction and irrelevancy reduction. The...
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7110941 |
System and method for embedded audio coding with implicit auditory masking
The embedded audio coder (EAC) is a fully scalable psychoacoustic audio coder which uses a novel perceptual audio coding approach termed “implicit auditory masking” which is intermixed with a...
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7107212 |
Bitstream data reduction coding by applying prediction
A data processing apparatus for data processing an audio signal includes an input terminal ( 1 ) for receiving the audio signal, a 1-bit A/D converter ( 4 ) for A/D converting the audio signal to...
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7103554 |
Method and device for generating a data flow from variable-length code words and a method and device for reading a data flow from variable-length code words
In a method for producing a data stream of code words of variable lengths which are divided up into a plurality of sets of code words, wherein a raster having segments is specified for the data...
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