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7617110 |
Lossless audio decoding/encoding method, medium, and apparatus
A lossless audio encoding/decoding method, medium, and apparatus. The lossless audio encoding method includes converting an audio signal in a time domain into an audio spectral signal with an...
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7617100 |
Method and system for providing an excitation-pattern based audio coding scheme
An improved audio compression scheme is provided. The scheme uses an excitation pattern to more efficiently provide audio signal compression. Under the scheme, an input signal is transformed to the...
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RE40968 |
Encoding and decoding apparatus of LSP (line spectrum pair) parameters
An encoding and decoding apparatus quantizes LSP (Line Spectrum Pair) parameters, which are characteristics parameters of spectrum information included in a voice signal, with high accuracy and...
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7613606 |
Speech codecs
A method of encoding a frame in a communication network using multiple codec modes, wherein the frame encoded by each codec mode is represented by multiple parameters. The method includes at least...
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7613603 |
Audio coding device with fast algorithm for determining quantization step sizes based on psycho-acoustic model
An efficient audio coding device that quantizes and encodes digital audio signals with a reduced amount of computation. A spatial transform unit subjects samples of a given audio signal to a...
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7610198 |
Robust quantization with efficient WMSE search of a sign-shape codebook using illegal space
A method of searching a signed codebook to quantize a vector includes weighting a shape codevector in a set of shape codevectors with a weighting function for a Weighted Mean Square Error (WMSE)...
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7596490 |
Low bit-rate audio encoding
In a sinusoidal audio encoder a number of sinusoids are estimated per audio segment. A sinusoid is represented by frequency, amplitude and phase. The invention uses a track dependent quantization...
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7596487 |
Method of detecting voice activity in a signal, and a voice signal coder including a device for implementing the method
A method of detecting voice activity in a signal smoothes the “voice” or “noise” decision to avoid loss of speech segments. The method is particularly suitable for situations in which the...
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7593851 |
Precision piecewise polynomial approximation for Ephraim-Malah filter
Precision piecewise polynomial approximation for Ephraim-Malah filter is described herein. In one embodiment, an exemplary process includes computing a first parameter based on Wiener filter...
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7590532 |
Voice code conversion method and apparatus
It is so arranged that a voice code can be converted even between voice encoding schemes having different subframe lengths. A voice code conversion apparatus demultiplexes a plurality of code...
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7587316 |
Noise canceller
A noise canceller removes a noise component from an input speech signal. The noise canceller includes a noise cancellation coefficient adjuster that adjusts a noise cancellation coefficient to...
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7584096 |
Method and apparatus for encoding speech
A method of encoding speech in a communications system includes the steps of receiving a speech signal including voice signals and background signals, and detecting voice activity and providing an...
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7583804 |
Music information encoding/decoding device and method
In an audio-information encoding apparatus, in order to encode an audio signal containing a white-noise component, an index iL indicating the energy level of the white-noise component and an index...
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7580832 |
Apparatus and method for robust classification of audio signals, and method for establishing and operating an audio-signal database, as well as computer program
An apparatus for producing a fingerprint signal from an audio signal includes a means for calculating energy values for frequency bands of segments of the audio signal which are successive in time,...
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7577567 |
Multimode speech coding apparatus and decoding apparatus
Square sum calculator 603 calculates a square sum of evolution in smoothed quantized LSP parameter for each order. A first dynamic parameter is thereby obtained. Square sum calculator 605 ...
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7574355 |
Apparatus and method for determining a quantizer step size
For determining a quantizer step size for quantizing a signal including audio or video information, a first quantizer step size as well as an interference threshold are provided. Then, the actual...
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7548850 |
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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7546240 |
Coding with improved time resolution for selected segments via adaptive block transformation of a group of samples from a subband decomposition
A transform coder is described that performs a time-split transform in addition to a discrete cosine type transform. A time-split transform is selectively performed based on characteristics of...
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7539612 |
Coding and decoding scale factor information
Techniques and tools for representing, coding, and decoding scale factor information are described herein. For example, during encoding of scale factors, an encoder uses one or more of flexible...
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7536302 |
Method, process and device for coding audio signals
A method and a device for audio coding are disclosed. An audio coding device includes an audio coder for receiving audio signals and generating base data and enhancement data; and a rearranging...
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7536299 |
Correlating and decorrelating transforms for multiple description coding systems
Transmitters and receivers in multiple description coding systems use correlating and decorrelating transforms to generate and process multiple descriptions of elements of an input signal. The...
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7532671 |
Gain control method and apparatus
An analog/digital gain control device avoid some of the requirements associated with the nature of a closed-loop AGC circuits and which meets the remaining requirements without much difficulty uses...
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7505900 |
Signal encoding apparatus, signal encoding method, and program
The present invention intends to render quantization noise virtually imperceptible for a user and to prevent reduction in frequency resolution and reduction in encoding efficiency. A signal...
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7502734 |
Method and device for robust predictive vector quantization of linear prediction parameters in sound signal coding
The exemplary embodiments of this invention relate to a method and device for quantizing linear prediction parameters in variable bit-rate sound signal coding, in which an input linear prediction...
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7493255 |
Generating LSF vectors
To alleviate problems of signal aliasing and to reduce complexity, Linear Predictive Coefficients (LPCS) are calculated from samples of audio signals and Line Spectral Frequency (LSF) vectors are...
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7490037 |
Method and apparatus for encoding signals
The invention concerns a method of encoding signals, in particular digitized audio signals, with an encoding device for encoding the signal in an encoding format and a processing device for...
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7484155 |
Analog base-band test apparatus and method by enhanced combination of JTAG and memory in mobile communication system
An analog base-band (ABB) chipset of a mobile communication system comprises a memory configured to store a test pattern, a test control unit configured to generate a control signal during a test...
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7469209 |
Method and apparatus for frame classification and rate determination in voice transcoders for telecommunications
A method and apparatus for frame classification and rate determination in voice transcoders. The apparatus includes a classifier input parameter preparation module that unpacks the bitstream from...
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7464030 |
Vector search method
Each of the M basic vectors in a noise code book 260 is multiplied by a factor ±1 in a sign adder 270 and combined in an adder 280 to create 2 M noise signed vectors. The characteristic of...
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7464027 |
Method and device for quantizing an information signal
Quantizing an information signal of a sequence of information values includes frequency-selective filtering the sequence of information values to obtain a sequence of filtered information values...
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7460993 |
Adaptive window-size selection in transform coding
A transform coder adaptively configures window sizes for transform coding in a two-pass process to maximize coding efficiency, while achieving necessary time resolution to avoid pre-echo. In a...
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7454329 |
Method and apparatus for classifying signals, method and apparatus for generating descriptors and method and apparatus for retrieving signals
The input signal can be quickly and accurately classified and a descriptor can be generated according to the result of classification. Then, the input signal can be retrieved on the basis of the...
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7454327 |
Method and apparatus for introducing information into a data stream and method and apparatus for encoding an audio signal
An inventive method for introducing information into a data stream including data about spectral values representing a short-term spectrum of an audio signal first performs a processing of the data...
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7451080 |
Controlling apparatus and method for bit rate
An apparatus and a method for controlling a bit rate are provided. The apparatus and method includes a buffer for storing information as to a bit rate of a frame immediately preceding a frame to be...
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7447639 |
System and method for error concealment in digital audio transmission
A beat-pattern based error concealment system and method which detects drum-like beat patterns of music signals on the encoder side of the system and embeds the beat information as data ancillary...
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7447631 |
Audio coding system using spectral hole filling
Audio coding processes like quantization can cause spectral components of an encoded audio signal to be set to zero, creating spectral holes in the signal. These spectral holes can degrade the...
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7426466 |
Method and apparatus for quantizing pitch, amplitude, phase and linear spectrum of voiced speech
A method and apparatus for predictively quantizing voiced speech includes a parameter generator and a quantizer. The parameter generator is configured to extract parameters from frames of...
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7418395 |
Method and system for reduction of quantization-induced block-discontinuities and general purpose audio codec
A method and system for reduction of quantization-induced block-discontinuities arising from lossy compression and decompression of continuous signals, especially audio signals. One embodiment...
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7408918 |
Methods and apparatus for lossless compression of delay sensitive signals
Methods and apparatus are provided for compressing delay sensitive signals. Frames including multiple samples of the delay sensitive signal are analyzed to determine characteristics associated with...
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7400651 |
Device and method for interpolating frequency components of signal
A frequency interpolation apparatus is provided which reproduces a signal similar to an original signal by approximately recovering suppressed frequency components, from an input signal having the...
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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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7373282 |
Fault severity check and source identification
A fault severity check and source identification method for a frequency domain instrument accesses acquired reflection data for a transmission line under test. From the acquired data reflection...
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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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7353168 |
Method and apparatus to eliminate discontinuities in adaptively filtered signals
A method to eliminate discontinuities in an adaptively filtered signal includes filtering a beginning portion of a current signal frame using a past set of filter coefficients, thereby producing a...
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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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7340394 |
Using quality and bit count parameters in quality and rate control for digital audio
An audio encoder regulates quality and bitrate with a control strategy. The strategy includes several features. First, an encoder regulates quantization using quality, minimum bit count, and...
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7318028 |
Method and apparatus for determining an estimate
For determining an estimate of a need for information units for encoding a signal, a measure for the distribution of the energy in the frequency band is taken into account in addition to the...
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7318023 |
Method for detecting the quantization of spectra
The invention comprises the retrieval of a quantized spectrum of audio-data, which had been compressed conforming to psychoacoustic principles. This spectrum can be identified with the aid of...
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7310598 |
Energy based split vector quantizer employing signal representation in multiple transform domains
The invention relates to representation of one and multidimensional signal vectors in multiple nonorthogonal domains and design of Vector Quantizers that can be chosen among these representations....
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7308402 |
Error resistant scalable audio coding partitioned for determining errors
A scalable audio codec processes, quantizes and encodes audio signals into an embedded audio bitstream of bit-planes each having a data unit. The data unit has a beginning refinement bits...
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