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7627702 |
Data reproduction device and method, and program
Memory resources can be optimized by dynamically determining a threshold value of a storage device used for buffering in accordance with a compression rate of data for streaming reproduction. A...
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7624022 |
Speech compression and decompression apparatuses and methods providing scalable bandwidth structure
A speech compression apparatus including: a first band-transform unit transforming a wideband speech signal to a narrowband low-band speech signal; a narrowband speech compressor compressing the...
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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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7613609 |
Apparatus and method for encoding a multi-channel signal and a program pertaining thereto
To encode multi-channel digital data by adjusting the number of bits allocated to each channel to perform entropy coding of the multi-channel data, there is provided a multi-channel encoder...
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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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7610205 |
High quality time-scaling and pitch-scaling of audio signals
In one alternative, an audio signal is analyzed using multiple psychoacoustic criteria to identify a region of the signal in which time scaling and/or pitch shifting processing would be inaudible...
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7606716 |
Systems and methods for multi-dialog surround audio
Systems and processes for transmission of multi-channel audio from a sender to one or more recipients. Multi-channel audio is encoded with a plurality of different dialog channels. The encoded...
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7606705 |
Speech data receiver with detection of channel-coding rate
Disclosed is a system and method for channel decoding speech frames in a receiver capable of multiple (M) codec modes, wherein channel encoded speech frames include an inband bit portion and a...
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7602922 |
Multi-channel encoder
There is described a multi-channel encoder ( 10; 600 ) for processing input signals conveyed in N input channels to generate corresponding output signals conveyed in M output channels together with...
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7599840 |
Selectively using multiple entropy models in adaptive coding and decoding
Techniques and tools for selectively using multiple entropy models in adaptive coding and decoding are described herein. For example, for multiple symbols, an audio encoder selects an entropy model...
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7596486 |
Encoding an audio signal using different audio coder modes
The invention relates to a method for supporting an encoding of an audio signal, wherein a first coder mode and a second coder mode are available for encoding a respective section of an audio...
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7587314 |
Single-codebook vector quantization for multiple-rate applications
This invention relates to a method, a device and a software application product for N-level quantization of vectors, wherein N is selectable prior to said quantization from a set of at least two...
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7567897 |
Method for dynamic selection of optimized codec for streaming audio content
Several encoders at a broadcast system encode the same audio content. Packets from the resulting streams are immediately decoded and compared against the packets of the original audio stream. The...
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7555434 |
Audio decoding device, decoding method, and program
An energy corrector ( 105 ) for correcting a target energy for high-frequency components and a corrective coefficient calculator ( 106 ) for calculating an energy corrective coefficient from...
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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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7532728 |
Mechanism for using the allpass decomposition architecture for the cauer low pass filter used in a BTSC
An BTSC encoder with an improved digital filter structure substantially implemented on a single CMOS integrated circuit is described. By cascading first and second order allpass filter structures...
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7523039 |
Method for encoding digital audio using advanced psychoacoustic model and apparatus thereof
A digital audio encoding method using an advanced psychoacoustic model is provided. The audio encoding method including determining the type of a window according to the characteristic of an input...
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7519538 |
Audio signal encoding or decoding
Encoding an audio signal is provided wherein the audio signal includes a first audio channel and a second audio channel, the encoding comprising subband filtering each of the first audio channel...
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7516064 |
Adaptive hybrid transform for signal analysis and synthesis
Analysis and synthesis filter banks such as those used in audio and video coding systems are each implemented by a hybrid transform that comprises a primary transform in cascade with one or more...
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7512539 |
Method and device for processing time-discrete audio sampled values
An integer transform, which provides integer output values, carries out the TDAC function of a MDCT in the time domain before the forward transform. In overlapping windows, this results in a Givens...
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7509294 |
Synthesis subband filter for MPEG audio decoder and a decoding method thereof
A synthesis filter for an MPEG audio decoder, and a decoding method thereof. The synthesis filter for an MPEG audio decoder includes a butterfly computation part which performs a butterfly...
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7509254 |
Encoding device and decoding device
An encoding device ( 200 ) includes an MDCT unit ( 202 ) that transforms an input signal in a time domain into a frequency spectrum including a lower frequency spectrum, a BWE encoding unit ( 204 )...
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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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7496517 |
Method and device for generating a scalable data stream and method and device for decoding a scalable data stream with provision for a bit saving bank function
In a method for generating a scalable data stream from one or several blocks of output data of a first encoder and from one or several blocks of output data of a second encoder a determining data...
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7490044 |
Audio signal processing
An audio system for processing two channels of audio input to provide more than two output channels. The input may be conventional stereo material or compressed audio signal data. The audio...
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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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7469206 |
Methods for improving high frequency reconstruction
The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilizing high frequency reconstruction (HFR). It utilizes a detection mechanism ( 703...
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7461004 |
Content filtering for a digital audio signal
According to some embodiments, content filtering is provided for a digital audio signal.
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7460990 |
Efficient coding of digital media spectral data using wide-sense perceptual similarity
Traditional audio encoders may conserve coding bit-rate by encoding fewer than all spectral coefficients, which can produce a blurry low-pass sound in the reconstruction. An audio encoder using...
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7457747 |
Noise detection for audio encoding by mean and variance energy ratio
The techniques described are utilized for detection of noise and noise-like segments in audio coding. The techniques can include performing a prediction gain calculation, an energy compaction...
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7457742 |
Variable rate audio encoder via scalable coding and enhancement layers and appertaining method
A maximum of Nmax bits for encoding is defined for a set of parameters which may be calculated from a signal frame. The parameters for a first sub-set are calculated and encoded with N0 bits, where...
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7454353 |
Method and device for the generation of a scalable data stream and method and device for decoding a scalable data stream
In a method of producing a scalable data stream of at least two blocks of output data of a first coder and a block of output data of a second coder, wherein the at least two blocks of output data...
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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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7451092 |
Detection of signal modifications in audio streams with embedded code
An encoder transforms at least a portion of a signal, counts the resulting transform coefficients having a zero value, and encodes the signal with the zero count. A decoder decodes the signal in...
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7447317 |
Compatible multi-channel coding/decoding by weighting the downmix channel
In processing a multi-channel audio signal having at least three original channels, a first downmix channel and a second downmix channel are provided, which are derived from the original channels....
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7433824 |
Entropy coding by adapting coding between level and run-length/level modes
An audio encoder performs adaptive entropy encoding of audio data. For example, an audio encoder switches between variable dimension vector Huffman coding of direct levels of quantized audio data...
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7424434 |
Unified lossy and lossless audio compression
A unified lossy and lossless audio compression scheme combines lossy and lossless audio compression within a same audio signal. This approach employs mixed lossless coding of a transition frame...
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7418396 |
Reduced memory implementation technique of filterbank and block switching for real-time audio applications
Presented herein is a reduced memory implementation technique of filterbank and block switching for real-time audio applications. Calculation of the pulse code modulated samples from the IMDCT...
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7409350 |
Audio processing method for generating audio stream
An audio processing method utilized to generate an audio stream. An audio frame includes N frequency subbands. An Ith frequency subband among the N frequency subbands includes M audio samples and...
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7395346 |
Information frame modifier
A device in a subscriber television system receives a stream of frames of information, and each frame of information is carried in at least one network packet that is formatted according to a first...
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7395209 |
Fixed point audio decoding system and method
A digital audio decoder for receiving an encoded audio signal and decoding the audio signal. The digital audio decoder uses both real time computations and calculations pre-stored in a look-up...
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7394903 |
Apparatus and method for constructing a multi-channel output signal or for generating a downmix signal
The apparatus for constructing a multi-channel output signal using an input signal and parametric side information, the input signal including the first input channel and the second input channel...
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7391870 |
Apparatus and method for generating a multi-channel output signal
An apparatus for generating a multi-channel output signal performs a center channel cancellation to obtain improved base channels for reconstructing left-side output channels or right-side output...
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7382886 |
Efficient and scalable parametric stereo coding for low bitrate audio coding applications
The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by...
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7379878 |
Information encoding apparatus and method, information decoding apparatus and method, recording medium utilizing spectral switching for embedding additional information in an audio signal
An information encoding apparatus and method, an information decoding apparatus and method, a recording medium, and a program make it possible to embed information without causing an increase in...
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7363231 |
Coding device, decoding device, and methods thereof
A coding device capable of improving the coding efficiency and a decoding device for decoding a code sequence generated by the coding device are provided. In the coding device, for each of the...
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7363216 |
Method and system for parametric characterization of transient audio signals
A method of parametrically encoding a transient audio signal, including the steps of: determining a set V of the N largest frequency components of the transient audio signal, where N is a...
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7356083 |
Data compression system and method
This invention produces data packets that can vary in length and/or data compression ratio. First, an algorithm is employed to transform a data signal into fixed or variable length data packets at...
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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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7346513 |
Audio signal saving operation controlling method, program thereof, record medium thereof, audio signal reproducing operation controlling method, program thereof, record medium thereof, audio signal inputting operation controlling method, program thereof, and record medium thereof
A method that allows two or more APs (application programs) to use a sound card and an AP to select an input device of the sound card regardless of a mixer device of the sound card is disclosed. A...
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