Patent
Scalable decoder and disappeared data interpolating method
Takuya Kawashima,Hiroyuki Ehara +1 more
- 27 Jun 2006
27
TL;DR: In this article, a scalable decoder capable of preventing degradation of the quality of the decoded signal in a disappeared data interpolation in band scalable coding is proposed, which is based on the concept of a core layer decoding section.
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Abstract: A scalable decoder capable of preventing degradation of the quality of the decoded signal in a disappeared data interpolation in band scalable coding. A core layer decoding section (101) acquires a core layer decoded signal and narrow band spectrum information by decoding. A narrow band spectrum slope computing section (103) computes the slope of an attenuation line of a narrow band spectrum from the narrow band spectrum information. An extended layer disappearance detection section (104) detects whether extended layer coded data has disappeared or not. An extended layer decoding section (105) normally decodes the extended layer coded data. If the extended layer disappears, a parameter required for decoding is interpolated and synthesizes an interpolation decoded signal by the interpolated parameter. The gain of the interpolated data is controlled according to the results of the computation, by the narrow band spectrum slope computing section (103).
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Citations
Patent
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TL;DR: In this paper, a method of decoding an encoded audio bitstream at a decoder includes receiving the audio bit stream, decoding a low band bitstream of the audio bitsstream to get low band coefficients in a frequency domain, and copying a plurality of the low bands coefficients to a high frequency band location to generate high band coefficients.
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53
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Jianfeng Xu,Lei Miao,Chen Hu,Qing Zhang,Lijing Xu,Wei Li,Zhengzhong Du,Yi Yang,Fengyan Qi,Wuzhou Zhan,Dongqi Wang +10 more
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TL;DR: In this paper, a method for performing a frame erasure concealment to a higher-band signal, including calculating a periodic intensity of a higherband signal with respect to a lowerband signal was presented.
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TL;DR: In this article, the authors proposed an audio signal switching method for audio signals with different band widths and the quality of the audio signals received by a user is improved by processing the first highfrequency band signal of the current frame according to the second high-frequency band signals of audio signals of the first M frames.
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TL;DR: In this paper, a method and apparatus for determining a weighting function for quantizing a linear predictive coding (LPC) coefficient and having a low complexity was proposed, which may convert an LPC coefficient of a mid-subframe of an input signal to one of a immitance spectral frequency (ISF) coefficient, and may determine the weighting functions associated with an importance of the ISF coefficient or the LSF coefficient based on the converted ISF coefficients or LSF coefficients.
15
References
Patent
Multiple access communications system and method using code and time division
Paul W. Dent
- 20 Feb 1997
TL;DR: In this paper, a multiple access communications system and method using Code Division Multiple Access (CDMA) and time division multiple access (TDMA) comprises coding information signals with CDMA codewords to be transmitted over a common frequency spectrum.
182
Patent
Excitation vector generator, speech coder and speech decoder
Kazutoshi Yasunaga,Toshiyuki Morii,Hiroyuki Ehara +2 more
- 30 Apr 2001
TL;DR: In this paper, a random code vector reading section was replaced with an oscillator for outputting different vector streams in accordance with values of input seeds, and a seed storage section for storing a plurality of seeds.
92
Patent
Wideband signal transmission system
Andreas J. Gerrits
- 20 Jun 2002
TL;DR: In this paper, a transmission system consisting of a transmitter (12) and a receiver (14) is described, in which the reconstruction means (48) are arranged for reconstructing the second decoded frequency band signal from the first decoded band signal.
87
Patent
LPC-harmonic vocoder with superframe structure
Allen Gersho,Cuperman Vladimir,Tian Wang,Kazuhito Koishida +3 more
- 20 Sep 2000
TL;DR: In this paper, an enhanced low-bit rate parametric voice coder that groups a number of frames from an underlying frame-based vocoder, such as MELP, into a superframe structure is presented.
82
Error Concealment in relation to decoding of encoded acoustic signals
TL;DR: In this paper, the authors proposed a scheme for the concealment of errors in decoded acoustic signals caused by encoded data representing the acoustic signals being partially lost or damaged during transmission over a transmission medium.
70