Patent
Audio encoder and decoder
TLDR
In this article, a linear prediction unit for filtering an input signal based on an adaptive filter; a transformation unit for transforming a frame of the filtered input signal into a transform domain; and a quantization unit for quantizing the transform domain signal.Abstract:
The present invention teaches a new audio coding system that can code both general audio and speech signals well at low bit rates. A proposed audio coding system comprises linear prediction unit for filtering an input signal based on an adaptive filter; a transformation unit for transforming a frame of the filtered input signal into a transform domain; and a quantization unit for quantizing the transform domain signal. The quantization unit decides, based on input signal characteristics, to encode the transform domain signal with a model-based quantizer or a non-model-based quantizer. Preferably, the decision is based on the frame size applied by the transformation unit.read more
Citations
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Patent
Multi-mode audio signal decoder, multi-mode audio signal encoder, methods and computer program using a linear-prediction-coding based noise shaping
Max Neuendorf,Guillaume Fuchs,Nikolaus Rettelbach,Tom Baeckstroem,Jeremie Lecomte,Herre Juergen +5 more
TL;DR: In this paper, a multi-mode audio signal decoder for providing a decoded representation of an audio content on the basis of an encoded representation of the audio content comprises a spectral value determinator configured to obtain sets of decoded spectral coefficients for a plurality of portions of audio content.
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method and an apparatus for processing an audio signal
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Encoding device and method, decoding device and method, and program
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TL;DR: In this paper, the authors proposed an encoding device and method, and a decoding device and a program which enable music signals to be played with higher sound quality by expanding a frequency band.
References
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Patent
Source coding enhancement using spectral-band replication
Liljeryd Lars Gustaf,Ekstrand Per Rune Albin,Henn Lars Fredrik,Hans Magnus Kristofer Kjorling +3 more
TL;DR: In this article, the authors proposed a new method and apparatus for the enhancement of source coding systems, which employs bandwidth reduction (101) prior to or in the encoder, followed by spectral-band replication (105) at the decoder.
BookDOI
The Digital Signal Processing Handbook
TL;DR: The Digital Signal Processing Handbook (DSP) as mentioned in this paper provides a comprehensive overview of signal processing related to wireless, radar, spacetime coding, and mobile communications, together with associated applications to networking, storage, and communications.
MP3 and AAC Explained
TL;DR: The basic technology and some of the special features of MPEG1/2 Layer-3 (aka MP3) are explained and some light on the factors determining the quality of compressed audio and what can be done wrong in MPEG encoding and decoding is shed.
PatentDOI
Adaptive-block-length, adaptive-transform, and adaptive-window transform coder, decoder, and encoder/decoder for high-quality audio
TL;DR: In this article, the tradeoff between time resolution and frequency resolution is optimized by adaptively selecting the transform block length for each sampled audio segment, and/or can optimize coding gain by adapting the transform and analysis window or the analysis/synthesis window pair.
Patent
Multichannel audio coding
TL;DR: In this article, the authors proposed an improved decorrelation of multiple audio channels derived from a monophonic audio channel or from multiple channels of audio along with related auxiliary information from which multiple channels can be reconstructed.