Patent
Audio encoder and decoder
Per Hedelin,Pontus Jan Carlsson,Jonas Samuelsson,Michael Schug +3 more
- 30 Dec 2008
170
TL;DR: 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.
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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.
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Citations
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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
- 06 Oct 2010
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.
66
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Heiko Purnhagen,Pontus Carlsson,Kristofer Kjoerling +2 more
- 05 Mar 2010
TL;DR: In this paper, a perceptual stereo encoder and decoder system is proposed, which consists of a downmix stage for generating downmix signal and a residual signal based on a stereo signal.
66
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Method and apparatus for compressing and decompressing a Higher Order Ambisonics signal representation
Alexander Krueger,Sven Kordon,Johannes Boehm,Johann-Markus Batke +3 more
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TL;DR: In this article, a reduced-order ambient component is transformed to the spatial domain, and is perceptually coded together with the directional signals at the receiver side, the encoded directional signals and the order-reduced encoded ambient component are perceptually decompressed, the perceptually decressed ambient signals are transformed to an HOA domain representation of reduced order, followed by order extension.
62
Patent
method and an apparatus for processing an audio signal
Jae Hyun Lim,Dong Soo Kim,Hyunkook Lee,Sung Yong Yoon,Hee Suk Pang +4 more
- 31 Dec 2008
TL;DR: In this paper, a plurality of frame data including first frame data and second frame data encoded by at least one coding schemes, obtaining first flag information indicating whether the first-frame data and the second-frame-data are encoded by frequency domain transform coding scheme, respectively.
59
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Encoding device and method, decoding device and method, and program
Yuki Yamamoto,Toru Chinen +1 more
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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.
54
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Mark F. Davis
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Patent
Scalable and embedded codec for speech and audio signals
Joseph Gerard Aguilar,David A. Campana,Juin-Hwey Chen,Robert B. Dunn,Robert J. McAulay,Xiaoquin Sun,Wei Wang,Craig Robert Watkins,Robert W. Zopf +8 more
- 10 Aug 2007
TL;DR: In this article, a system and method for processing of audio and speech signals is disclosed, which provide compatibility over a range of communication devices operating at different sampling frequencies and/or bit rates.
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