Patent
Speech encoding device, speech decoding device, speech encoding method, speech decoding method, speech encoding program, and speech decoding program
Kosuke Tsujino,Kei Kikuiri,Nobuhiko Naka +2 more
- 02 Apr 2010
36
TL;DR: In this paper, a linear prediction coefficient of a signal represented in a frequency domain is obtained by performing linear prediction analysis in the frequency direction by using a covariance method or an autocorrelation method.
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Abstract: A linear prediction coefficient of a signal represented in a frequency domain is obtained by performing linear prediction analysis in a frequency direction by using a covariance method or an autocorrelation method. After the filter strength of the obtained linear prediction coefficients is adjusted, filtering is performed in the frequency direction on the signal by using the adjusted coefficients, whereby the temporal envelope of the signal is shaped. This reduces the occurrence of pre-echo and post-echo and improves the subjective quality of the decoded signal, without significantly increasing the bit rate in a bandwidth extension technique in the frequency domain represented by SBR.
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Citations
Patent
Apparatus and method for encoding and decoding signal for high frequency bandwidth extension
Ki-hyun Choo,Eunmi Oh,Ho-Sang Sung +2 more
- 28 Dec 2011
TL;DR: In this article, an apparatus and method for encoding and decoding a signal for high frequency bandwidth extension are provided. But the method is not suitable for the case of time domain input signals.
59
Patent
Speech encoding/decoding device
Kosuke Tsujino,Kei Kikuiri,Naka Nobuhiko +2 more
- 23 Sep 2011
TL;DR: In this article, a linear prediction coefficient of a signal represented in a frequency domain is obtained by performing linear prediction analysis in the frequency direction by using a covariance method or an autocorrelation method.
23
Patent
Apparatus and method for encoding or decoding an audio signal with intelligent gap filling in the spectral domain
Sascha Disch,Frederik Nagel,Geiger Ralf,Balaji Thoshkahna,Konstantin Schmidt,Bayer Stefan,Christian Neukam,Bernd Edler,Christian Helmrich +8 more
- 15 Jul 2014
TL;DR: In this article, a spectral domain audio decoder was proposed for decoding an encoded audio signal, consisting of a spectral decoder for generating a first decoded representation of a first set of first spectral portions and a spectrum time converter for converting the first decoding representation and the reconstructed second spectral portion into a time representation.
16
Patent
Audio encoder, audio decoder and related methods using two-channel processing within an intelligent gap filling framework
Sascha Disch,Frederik Nagel,Geiger Ralf,Balaji Thoshkahna,Konstantin Schmidt,Bayer Stefan,Christian Neukam,Bernd Edler,Christian Helmrich +8 more
- 15 Jul 2014
TL;DR: In this article, an apparatus for generating a decoded two-channel signal, consisting of an audio processor (802), a parametric decoder (804), and a frequency regenerator (806) for regenerating a second spectral portion depending on a first spectral portion of the first set of first spectral portions.
13
Patent
Speech decoder, speech encoder, speech decoding method, speech encoding method, speech decoding program, and speech encoding program
Kei Kikuiri,Yamaguchi Atsushi +1 more
- 16 Feb 2012
TL;DR: In this article, a speech decoder includes a demultiplexing unit (1a), a low frequency band decoding unit, a band splitting filter bank unit, and a coded sequence analysis unit.
11
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Jürgen Herre,James D. Johnston +1 more
TL;DR: A novel approach to the pre-echo problem is presented allowing to shape the quantization noise in time, shown to work efficiently also in the case of "pitched" signals (e.g. speech) where traditional block switching schemes do not offer an efficient solution.
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Patent
Encoding device and decoding device
Mineo Tsushima,Takeshi Norimatsu,Kosuke Nishio,Naoya Tanaka +3 more
- 07 Nov 2002
TL;DR: In this paper, 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) that generates extension data which specifies a higher frequency spectrum at higher frequency than the lower spectrum, and an encoded data stream generating unit (205) that encodes to output the lower-frequency spectrum obtained by the MDCT units and the extension data obtained by BWE units.
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Audio signal encoding or decoding
Lars Villemoes,Per Ekstrand,Heiko Purnhagen,Erik Gosuinus Petrus Schuijers,Bont Fransiscus Marinus Jozephus De +4 more
TL;DR: In this paper, the authors provided a set of spatial parameters from the sub-subband signals and from those downsampled subband signals that are not further subband filtered.
114
Bandwidth Extension for Hierarchical Speech and Audio Coding in ITU-T Rec. G.729.1
Bernd Geiser,Peter Jax,Peter Vary,Herve Marcel Taddei,Stefan Schandl,Martin Gartner,C. Guillaume,Stéphane Ragot +7 more
TL;DR: This recommendation describes a hierarchical speech and audio coding algorithm built on top of a narrowband core codec, which extends the transmitted acoustic bandwidth from the narrowband frequency range to the wide band frequency range.
99
Patent
Audio decoding apparatus and method
Naoya Neyagawa-shi Tanaka,Osamu Shimada,Mineo Tsushima,Takeshi Norimatsu,Kok Seng Chong,Kim Hann Kuah,Sua Hong Neo,Toshiyuki Nomura,Yuichiro Takamizawa,Masahiro Serizawa +9 more
- 11 Sep 2003
TL;DR: In this paper, an audio decoding apparatus decodes high frequency component signals using a band expander that generates multiple high frequency subband signals from low frequency sub-band signals divided into multiple subbands and transmitted high frequency encoded information.
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