Results 151 to 160 of about 62,294 (212)

Perceptual Audio Coding of Speech Signals

2008
Traditionally algorithms for speech coding exploit the features of speech signals by employing algorithmic models of the human vocal tract. More recently, the use of generic audio coders for coding of speech signals has gained increasing importance.
Jürgen Herre, Manfred Lutzky
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Multiple description perceptual audio coding with correlating transforms

IEEE Transactions on Speech and Audio Processing, 2000
In audio communication over a lossy packet network, concealment techniques are used to mitigate the effects of lost packets. This concealment is markedly improved if the compressed representation retains redundancy to aid in the estimation of lost information.
R. Arean, J. Kovacevic, V.K. Goyal
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Perceptual component selection in sinusoidal coding of audio

2001 IEEE Fourth Workshop on Multimedia Signal Processing (Cat. No.01TH8564), 2002
This paper presents a new method for selecting the sinusoids in a hybrid audio signal model consisting of sinusoidal, transient, and noise (STN) components. The method relies on a new methodology for ranking and selection of the most perceptually relevant sinusoids.
T. Painter, A. Spanias
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Perceptual Audio Coding - A History and Timeline

2007 Conference Record of the Forty-First Asilomar Conference on Signals, Systems and Computers, 2007
Perceptual Audio Coding, now a very common technology, is a classic example of a technology that arose in several places simultaneously when the "time was right". Here, we will mostly discuss the timeline from the point of view of the people who worked on and about perceptual coding (both audio and video) at AT&T Bell Labs and its successor AT&T Labs ...
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Real-time performance measures of perceptual audio coding

ITRE 2004. 2nd International Conference Information Technology: Research and Education, 2005
The selection of the wavelet packet best basis of a perceptual real-time audio encoder has been a challenging task for researchers. Due to the subjective nature of the auditory masking phenomenon, fully objective performance measures (entropy versus SNR, delay, etc.) are not sufficient for the selection of optimal representations.
E. Pasero, A. Montuori
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Efficient bit assignment strategy for perceptual audio coding

2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03)., 2004
For the purpose of efficient audio coding at low rates, a new bit allocation strategy is proposed in this paper. The basic idea behind this approach is "Give bits to the band with the maximum NMR-Gain/bit" or "Retrieve bits from the band with the maximum bits/NMR-Loss". The notion of "bit-use efficiency" is suggested and it can be employed to construct
null Cheng-Han Yang, null Hsueh-Ming Hang   +1 more
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Perceptual coding of height-quality audio signals

The Journal of the Acoustical Society of America, 1994
Perceptual coders promise to deliver true transparent coding. The listener should not be able to hear any difference between original and reconstructed signal. The main elements of perceptual coders are (1) a filterbank to map the time domain input signal to a time- frequency domain representation, (i.e., the masked threshold) and (2) the quantization ...
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Audio Coding Using Masking-threshold Adapted Perceptual Filter

Proceedings., IEEE Workshop on Speech Coding for Telecommunications,, 2005
Most current work in LPC-based coding employs either postfitering or noise spectral shaping to take into account the auditory masking effect. In both cases, the LPC parameters are used to characterize both the synthesis filter and the perceptual weighting filter.
null Wen-Whei Chang, null Chin-Tung Wang
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Inter-channel de-correlation for perceptual audio coding

Applied Acoustics, 2005
Sound reproduction is evolving towards multi-channel systems with a growing number of channels. Consequently, high quality multi-channel codecs are required. Last generation perceptual audio codecs, represented by MPEG advanced audio coder (AAC), can efficiently code typical surround multi-channel material but may benefit from a previous block of inter-
Soledad Torres-Guijarro, Jon A. Beracoechea-Álava, Luis I. Ortiz-Berenguer, F. Javier Casajús-Quirós   +3 more
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Low delay perceptually lossless coding of audio signals

Proceedings DCC 2001. Data Compression Conference, 2002
A novel predictive lossless coding scheme is proposed. The prediction is based on a new weighted cascaded least mean squared (WCLMS) method. To obtain both a high compression ratio and a very low encoding and decoding delay, the residuals from the prediction are encoded using either a variant of adaptive Huffman coding or a version of adaptive ...
S. Dorward, D. Huang, S.A. Savari, G. Schuller, B. Yu   +4 more
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