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7437299 |
Coding of stereo signals
A method of encoding a multichannel signal, such as a stereophonic audio signal, including at least first and second signal components includes transforming at least the first and second signal...
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7343281 |
Processing of multi-channel signals
A method of generating a monaural signal (S) includes a combination of at least two input audio channels (L, R). Corresponding frequency components from respective frequency spectrum...
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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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7328150 |
Innovations in pure lossless audio compression
A lossless audio compression scheme is adapted for use in a unified lossy and lossless audio compression scheme. In the lossless compression, the adaptation rate of an adaptive filter is varied...
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7318026 |
Encoding apparatus and method, decoding apparatus and method, and recording medium recording apparatus and method
An encoding method comprising the steps of forming a difference signal which is the difference between a first channel signal and a second channel signal of an input PCM signal, encoding the...
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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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7292901 |
Hybrid multi-channel/cue coding/decoding of audio signals
Part of the spectrum of two or more input signals is encoded using conventional coding techniques, while encoding the rest of the spectrum using binaural cue coding (BCC). In BCC coding, spectral...
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7289584 |
Predictive multi-channel decoder
A method for decoding data from multiple channels by predicting future symbol periods is disclosed. The method includes the steps of receiving data symbols on two channels, detecting data symbol...
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7263480 |
Multi-channel signal encoding and decoding
A multi-channel linear predictive analysis-by-synthesis signal encoding method determines (S 1 ) a leading channel and encodes the leading channel as an embedded bitstream. Thereafter trailing...
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7260225 |
Method and device for processing a stereo audio signal
In a device for processing a stereo audio signal having a first channel and a second channel the stereo signal is at first analyzed to obtain a measure for a quantity of bits required by a coder to...
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7245234 |
Method and apparatus for encoding and decoding digital signals
Provided are method and apparatus for encoding and decoding multi-channel signals composed of a plurality of channels using a similarity between frequency bands and a similarity between channels....
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7243064 |
Signal processing of multi-channel data
An approach for providing non-commutative approaches to signal processing. Quaternions are used to represent multi-dimensional data (e.g., three- and four-dimensional data). Additionally, a linear...
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7196641 |
System and method for audio data compression and decompression using discrete wavelet transform (DWT)
A system for audio data processing including sub-systems for compression and for de-compression. The compression sub-system includes an AD converter, a segment-based multi-channel splitter...
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7120579 |
Filter banked gain control of audio in a noisy environment
A method and device for boosting an input signal to overcome noise. Both the input signal, S(t), and an estimate of the noise, N(t), are bandpassed in adjacent pass bands to produce signal and...
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7096240 |
Channel coupling for an AC-3 encoder
Channel coupling for an AC-3 encoder, using mixed precision computations and 16-bit coupling coefficient calculations for channels with 32-bit frequency coefficients.
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7076421 |
Method and system for supporting increased channel density
An exemplary multi-channel speech processor comprises a controller capable of interfacing with a plurality of channels, and at least one signal processing unit (SPU) coupled to the controller,...
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7039204 |
Equalization for audio mixing
During mixing of an N-channel input signal to generate an M-channel output signal, the mixed channel signals are equalized (e.g., amplified) to maintain the overall energy/loudness level of the...
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7006636 |
Coherence-based audio coding and synthesis
An auditory scene is synthesized from a mono audio signal by modifying, for each critical band, an auditory scene parameter (e.g., an inter-aural level difference (ILD) and/or an inter-aural time...
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7002994 |
Multi-channel audio distribution for aircraft passenger entertainment and information systems
A method of distributing audio channels to passengers of an aircraft includes digitally encoding a multiplicity of audio channels into a corresponding multiplicity of digital audio channels....
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6934676 |
Method and system for inter-channel signal redundancy removal in perceptual audio coding
A method and system for coding audio signals in a multi-channel sound system, wherein a plurality of MDCT units are used to reduce the audio signals for providing a plurality of MDCT coefficients....
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6873956 |
Multi-channel speech processor with increased channel density
An exemplary multi-channel speech processor comprises a controller capable of interfacing with a plurality of channels, and at least one signal processing unit (SPU) coupled to the controller,...
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6765930 |
Decoding apparatus and method, and providing medium
The invention reduces the circuit scale of a decoding apparatus for decoding input signals of multiple channels. A code string inputted to a code string resolver is resolved into signal components...
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6539357 |
Technique for parametric coding of a signal containing information
In a communications system, parametric coding in accordance with the invention is implemented to generate a representation of a stereo audio signal, which is composed of a left channel signal (L)...
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6360200 |
Process for reducing redundancy during the coding of multichannel signals and device for decoding redundancy-reduced multichannel signals
A redundance reduction method used in coding multichannel signals is proposed, where signals available in digitized form are predicted. A prediction error is computed, which is subsequently...
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6345246 |
Apparatus and method for efficiently coding plural channels of an acoustic signal at low bit rates
In multichannel acoustic signal coding and decoding, left- and right-channel signals are alternately interleaved for each sample to generate a one-dimensional signal sample sequence. The...
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6311161 |
System and method for merging multiple audio streams
A device and method are provided for merging one or more secondary audio channels, received from either a streaming application or from memory, with a primary stream of audio data output from a...
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6266368 |
Data compression/expansion on a plurality of digital information signals
A data compression apparatus is proposed for data compressing at least a first and a second digital information signal (L 0 ,L 1 ,L 2 , . . . ,R 0 ,R 1 , R 2 , . . .), each of the at least two...
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6252909 |
Multi-carrier transmission system utilizing channels of different bandwidth
A communication system for sending a sequence of symbols on a communication link. The system includes a transmitter for placing information indicative of the sequence of symbols on the...
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6226616 |
Sound quality of established low bit-rate audio coding systems without loss of decoder compatibility
A multi-channel audio compression technology is presented that extends the range of sampling frequencies compared to existing technologies and/or lowers the noise floor while remaining compatible...
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5890125 |
Method and apparatus for encoding and decoding multiple audio channels at low bit rates using adaptive selection of encoding method
A split-band coding system combines multiple channels of input signals into various forms of composite signals and generates spatial-characteristic signals representing soundfield spatial...
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5736943 |
Method for determining the type of coding to be selected for coding at least two signals
In the case of coding a plurality of signals which are not independent of e another, a selection of the suitable type of coding is made as a function of a similarity measure. According to one...
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5717670 |
Information compacting method and apparatus, compacted information expanding method and apparatus, compacted information recording/transmitting apparatus, compacted information receiving apparatus and recording medium
Digital audio data of at least two channels are orthogonal-transformed by orthogonal transform for effecting bit compaction. If, when the time length and window shape of the orthogonal transform...
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5651090 |
Coding method and coder for coding input signals of plural channels using vector quantization, and decoding method and decoder therefor
Power normalization parts calculate the average powers of input signals of a plurality of channels for each frame and divide the signals by the calculated average powers to generate normalized...
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5511093 |
Method for reducing data in a multi-channel data transmission
In a method for reducing data in a multi-channel data transmission, existing cross-relations between the signal channels are determined with due consideration of the transit-time difference. Upon...
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5434948 |
Polyphonic coding
A polyphonic (e.g. stereo) audioconferencing system, in which input left and right channels are time-aligned by variable delay stages (10a, 10b), controlled by a delay calculator (9) (e.g. by...
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