Patent
Lossless and near lossless scalable audio codec
TLDR
In this paper, a scalable audio codec uses perceptual transform coding to encode the base layer and the residual is calculated in a transform domain, which includes a frequency and possibly also multi-channel transform of the input audio.Abstract:
A scalable audio codec encodes an input audio signal as a base layer at a high compression ratio and one or more residual signals as an enhancement layer of a compressed bitstream, which permits a lossless or near lossless reconstruction of the input audio signal at decoding. The scalable audio codec uses perceptual transform coding to encode the base layer. The residual is calculated in a transform domain, which includes a frequency and possibly also multi-channel transform of the input audio. For lossless reconstruction, the frequency and multi-channel transforms are reversible.read more
Citations
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Patent
Encoding method, decoding method, encoding device, decoding device, program, and recording medium
TL;DR: In this paper, a plurality of samples are vector-quantized to obtain a vector quantization index and quantized values; bits are assigned in a predetermined order of priority based on auditory perceptual characteristics to one or more sets of sample positions among the sample positions.
Patent
Full-Band Scalable Audio Codec
Jinwei Feng,Chu Peter +1 more
TL;DR: In this article, a scalable audio codec for a processing device determines first and second bit allocations for each frame of input audio, and the allocations are made on a frame-by-frame basis based on the energy ratio between the two bands.
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Encoding method, decoding method, encoder, decoder, program, and recording medium
TL;DR: In this paper, the number of bits to be assigned to codes corresponding to noise or a pulse sequence obtained according to prediction analysis applied to time series signals included in a predetermined time interval is switched according to whether an index that indicates a level of periodicity and/or stationarity of input time-series signals satisfies a condition that indicates high periodicity or/or high stationarity.
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Variable bit rate lpc filter quantizing and inverse quantizing device and method
TL;DR: In this article, a method for inverse quantizing a LPC filter in the form of an input vector in a quantization domain, comprises a calculator of a first stage approximation of the input vector, a subtractor of the first-stage approximation from the input vectors to produce a residual vector, and a quantizer of the weighted residual vector to supply a quantized weighted residual vectors.
Patent
Scalable audio in a multi-point environment
TL;DR: In this paper, a scalable audio codec is proposed to implement distributed mixing and/or sender bit rate regulation in a multipoint conference, which allows the audio signal from each endpoint to be split into one or more frequency bands and for the transform coefficients within such bands to be prioritized such that usable audio may be decoded from a subset of the entire signal.
References
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Journal Article
Run-length encodings.
TL;DR: Run-length encodings are used for determining explicit form of Huffman coding when applied to geometric distribution in the context of discrete geometry.
Proceedings ArticleDOI
The H.264/AVC Advanced Video Coding Standard: Overview and Introduction to the Fidelity Range Extensions
TL;DR: An overview of this standard is provided, including the highlights of the capabilities of the new FRExt features, and some comparisons with the existing MPEG-2 and MPEG-4 Part 2 standards are provided.
Journal Article
ISO/IEC MPEG-2 Advanced Audio Coding
Marina Bosi,Karlheinz Brandenburg,Schuyler Quackenbush,Louis Dunn Fielder,Kenzo Akagiri,Hendrik Fuchs,Martin Dietz +6 more
TL;DR: The ISO/IEC MPEG-2 advanced audio coding (AAC) system was designed to provide MPEG2 with the best audio quality without any restrictions due to compatibility requirements.
Patent
Scalable audio coder and decoder
TL;DR: In this paper, the coder/decoder (codec) system of the present invention includes a coder and a decoder, which is capable of performing resolution switching, spectral weighting, digital encoding, and parametric modeling.
Patent
In-band signaling for data communications over digital wireless telecommunications networks
Dan A. Preston,Joseph D. Preston,Robert Leyendecker,Wayne Eatherly,Rod L. Proctor,Phillip R. Smith +5 more
TL;DR: In this article, an inband signaling modem (28) communicates digital data (29) over a voice channel (34) of a wireless telecommunications network (12), an input receives digital data.