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6745162 |
System and method for bit allocation in an audio encoder
The present invention relates to a system and method which serves as a refinement in the criteria used to improve the performance of audio signal processing systems. More specifically, the present...
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6741965 |
Differential stereo using two coding techniques
A first audio signal is generated from a number of stereo input channels (such as a left and a right channel). A signal level that corresponds to one of the plurality of input channels and another...
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6732073 |
Spectral enhancement of acoustic signals to provide improved recognition of speech
A method and apparatus for enhancing an auditory signal to make sounds, particularly speech sounds, more distinguishable. An input auditory signal is divided into a plurality of spectral channels....
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6725192 |
Audio coding and quantization method
In an audio coding and quantization method, each of spectral subband components of an audio signal is quantized whereby a quantizer step size for a related one of spectral subbands is obtained from...
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6718296 |
Measurement of signal quality
Apparatus for assessing the performance of telecommunications systems by comparison of a reference signal with the same signal as degraded by the system under test tends to give unreliable results...
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6718295 |
Speech band division decoder
A volume control unit 3 obtains, from a scale factor updating unit 2 , data about how much the playback scale factor of sub-bands adjacent to a sub-band to be emphasized has been reduced, and...
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6707869 |
Signal-processing apparatus with a filter of flexible window design
A filter to apply a window function to a digital signal is provided. The filter has a memory for storing a basic set of values representing a single window. An adapter can generate from this basic...
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6708145 |
Enhancing perceptual performance of sbr and related hfr coding methods by adaptive noise-floor addition and noise substitution limiting
Methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR) are introduced. The problem of insufficient noise contents is addressed in a...
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6694294 |
System and method of mu-law or A-law compression of bark amplitudes for speech recognition
A method and system that improves voice recognition by improving the voice recognizer of a voice recognition system. Mu-law compression of bark amplitudes is used to reduce the effect of additive...
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6687669 |
Method of reducing voice signal interference
In a method for reducing interferences in a voice signal, a noise reduction method is applied to the voice signal, and spectral psychoacoustic masking is taken into account. A spectral masking...
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6687663 |
Audio processing method and apparatus
A method of creating a compressed audio output signal from a series of input audio signals is disclosed and claimed. In one embodiment, the method may include, for each of the input audio signals...
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6687664 |
Audio-visual scrubbing system
A method and apparatus for an audio scrubbing system for synchronizing audio to an asynchronous clock while preserving pitch utilizes a phase-vocoder to implement time-scaling without pitch-shifting.
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6683547 |
Method and system for data compession with dictionary pre-load of a set of expected character strings
A method, apparatus and computer program product for encoding data transmitted over a communications channel, including pre-loading an encoder dictionary with a set of character strings expected to...
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6678653 |
Apparatus and method for coding audio data at high speed using precision information
An audio signal is converted from time domain into frequency conversion signal, and is coded at high speed. In order that the frequency information decoded by using the quantizing data may not be...
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6678647 |
Perceptual coding of audio signals using cascaded filterbanks for performing irrelevancy reduction and redundancy reduction with different spectral/temporal resolution
A perceptual audio coder is disclosed for encoding audio signals, such as speech or music, with different spectral and temporal resolutions for the redundancy reduction and irrelevancy reduction...
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6678648 |
Fast loop iteration and bitstream formatting method for MPEG audio encoding
In an MPEG audio encoder, a sign and an absolute value calculation are performed outside of the quantization inner loop, thereby reducing redundant calculations. The stored sign and absolute values...
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6665637 |
Error concealment in relation to decoding of encoded acoustic signals
The present invention relates to the concealment of errors in decoded acoustic signals caused by encoded data representing the acoustic signals being partially lost or damaged during transmission...
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6662248 |
Recording/reproducing apparatus using an IC memory
A recording/reproducing apparatus using an IC memory, comprising: an IC memory to/from which writing/reading of an audio signal is performed; and a control circuit for controlling writing/reading...
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6658378 |
Decoding method and apparatus and program furnishing medium
In a low bitrate speech encoding system, encoded bits are strongly protected against errors produced on a transmission path. A decoding side checks the transmission errors using an error check code...
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6654716 |
Perceptually improved enhancement of encoded acoustic signals
The invention relates to encoding of broadband and narrowband acoustic source signals (x) such that the perceived sound quality of corresponding reconstructed signals is improved in comparison to...
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6654723 |
Transmission system with improved encoder and decoder that prevents multiple representations of signal components from occurring
In a sinusoidal audio encoder it is known to use different time scales for analyzing different parts of the frequency spectrum. In prior art encoders sub-band filtering is used to split the input...
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6650762 |
Types-based, lossy data embedding
A new approach to data embedding within ITU G.722 and ITU G.711 based upon the method of types and universal classification is disclosed. A secondary data sequence is embedded in the original...
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6647367 |
Noise suppression circuit
An adaptive noise suppression system includes an input A/D converter, an analyzer, a filter, and a output D/A converter. The analyzer includes both feed-forward and feedback signal paths that allow...
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6647365 |
Method and apparatus for detecting noise-like signal components
Noise-like signal components are detected within arbitrary regions of the time-frequency plane. Various transforms are applied to G time domain samples with different spectral/temporal resolutions....
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6629283 |
Quantization error correcting device and method, and audio information decoding device and method
A quantization error correcting device corrects quantization error included in audio information at the time of decoding. The audio information is divided into a plurality of frequency bands and...
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6625574 |
Method and apparatus for sub-band coding and decoding
An input digital audio signal is divided into sub-band signals in respective sub-bands. Scale factors of the respective sub-bands are determined on the basis of the sub-band signals for every...
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6611798 |
Perceptually improved encoding of acoustic signals
Encoding an acoustic source signal such that a signal {circumflex over (z)} reconstructed from the encoded information has a perceptually high sound quality. The acoustic source signal is encoded...
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6602299 |
Flexible synchronization framework for multimedia streams
A flexible framework for synchronization of multimedia streams synchronizes the incoming streams on the basis of the collaboration of a transmitter-driven and a local inter-media synchronization...
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6604069 |
Signals having quantized values and variable length codes
Efficiently encoded signals wherein the compression ration can be high without a corresponding degradation of signal quality. The range of values of subband-based signal components for quantization...
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6594365 |
Acoustic system identification using acoustic masking
A system for identifying a model of an acoustic system in the presence of an external noise signal is disclosed. The system includes an acoustic actuator for generating controlled sound within the...
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6591241 |
Selecting a coupling scheme for each subband for estimation of coupling parameters in a transform coder for high quality audio
A method and apparatus for determining parameters for coupling of channels in a digital audio encoder. A frequency range of two audio channels is coupled together in a coupling channel, and a...
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6584441 |
Adaptive postfilter
The invention relates to the coding of speech at a variable bit rate, whereby the bit rates can vary from frame to frame, and more specifically to the methods and filters used for improving the...
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6573845 |
Method for converting an analogue signal into a binary output signal
A method for converting an analogue signal representing a runlength limited binary signal with runs of length of at least N into a binary output signal. The analogue signal is sampled and an...
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6574602 |
Dual channel phase flag determination for coupling bands in a transform coder for high quality audio
A method and apparatus for subband phase flag determination for coupling of channels in a dual channel audio encoder is based on a psychoacoustic model of the human auditory system. The method and...
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6571207 |
Device for processing phase information of acoustic signal and method thereof
A device for processing the phase information of an acoustic signal, and a method thereof are provided. This device processes the phase information of a digital speech signal which is expressed as...
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6567506 |
Telephone number recognition of spoken telephone number in a voice message stored in a voice messaging system
A voice messaging system such as a telephone answering device which allows automatic identification and tagging of a voice clip portion of a full voice message which contains a spoken telephone...
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6556965 |
Wired and cordless telephone systems with extended frequency range
A telephone that communicates high-quality audio signals and a method for communicating an audio signal with an extended frequency range over a telephone network. The cordless telephone has a...
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6542863 |
Fast codebook search method for MPEG audio encoding
A fast codebook search method for finding an optimal Huffman codebook from a group of Huffman codebooks, wherein the method is especially suited for MPEG-compliant audio encoding. In order to...
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6542865 |
Method and apparatus for subband coding, allocating available frame bits based on changable subband weights
A method according to the present invention generates weight data for each audio band and assigns a number of bits to each band according to the weight data. The method then calculates a total of...
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6542869 |
Method for automatic analysis of audio including music and speech
A method for determining points of change or novelty in an audio signal measures the self similarity of components of the audio signal. For each time window in an audio signal, a formula is used to...
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6532443 |
Reduced length infinite impulse response weighting
The processing volume in calculating a weight value for perceptually weighted vector quantization is decreased to speed up the processing or to minimize hardware. To this end, an inverted LPC finds...
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6526385 |
System for embedding additional information in audio data
A method and a system is provided for embedding and detecting additional information, such as copyright information, in audio data, so that a modification in the sonic quality due to the embedding...
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6516299 |
Method, system and product for modifying the dynamic range of encoded audio signals
A method, system and product for modifying the dynamic range of an encoded audio signal. The method includes receiving the encoded audio signal, the encoded audio signal having a first set of scale...
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6510924 |
Speech-controlled location-familiar elevator
Conventional elevators have a console for entering control information, via key depression. To make the known control arrangements simpler and more flexible to use by the user, the invention...
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6499008 |
Transceiver for selecting a source coder based on signal distortion estimate
A radio signal transceiver receiving at its input a speech signal and producing an output signal at a given output rate, the speech signal having undergone a source coding intended to sufficiently...
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6499010 |
Perceptual audio coder bit allocation scheme providing improved perceptual quality consistency
A method (and apparatus) for coding an audio signal, the method comprising the steps of partitioning the audio signal into a sequence of successive frames; calculating one or more noise thresholds...
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6480550 |
Method of compressing an analogue signal
Described is a method of compressing an analogue signal, e.g. a voice signal, the signal function being continuously sampled, quantized and encoded into data words, the difference between each two...
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6477489 |
Method for suppressing noise in a digital speech signal
A spectral subtraction is effected including: a first subtraction step in which overestimates of the spectral component of the noise are taken into account, to obtain spectral components of a first...
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6477490 |
Audio signal compression method, audio signal compression apparatus, speech signal compression method, speech signal compression apparatus, speech recognition method, and speech recognition apparatus
An audio signal compression apparatus for compressively coding an input audio signal comprises a time-to-frequency transformation unit for transforming the input audio signal to a frequency domain...
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6473731 |
Audio CODEC with programmable psycho-acoustic parameters
A system for recognizing the existence of and adjusting the psycho-acoustic parameters present in an audio digital CODEC. A audio digital CODEC is provided with various parameters that when changed...
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