منابع مشابه
Robust vector quantization for low bit rate speech coding
Speech coding systems for mobile communication have to cope with noisy channels. In particular, vector quantization as central data reduction scheme is highly sensitive to transmission errors due to the low redundancy in the encoded data. Here we present three methods for the design of a vector quantizer with enhanced robustness against transmission errors. First the optimization of the index a...
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In this paper, a novel channel–optimized multistage vector quantization (COMSVQ) codec is presented in which the stage codebooks are jointly designed. The proposed codec uses a signal source and channel–dependent distortion measure to encode line spectral frequencies derived from segments of a speech signal. Simulation results are provided to demonstrate the consistent reduction in the spectral...
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Low bitrate speech coding usually requires robustness to a wide range of speakers. The problem which we report on here is one where the compression rate must be maximized for the purposes of archival, but the compressed information must be available at a later date for the purposes of identifying a new speaker. The new speaker may or may not have been recorded in the archived database. As would...
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In this work, we present a new family of image compression algorithms derived from Shapiro’s embedded zerotrce wavelet (EZW) coder. These new algorithms introduce robustness to transmission errors into the bit stream while still preserving its embedded structure. This is done by partitioning the wavelet coefficients into groups, coding each group independently, and interleaving the bit streams ...
متن کاملNovel Pitch Detection Algorithm With Application to Speech Coding
This thesis introduces a novel method for accurate pitch detection and speech segmentation, named Multi-feature, Autocorrelation (ACR) and Wavelet Technique (MAWT). MAWT uses feature extraction, and ACR applied on Linear Predictive Coding (LPC) residuals, with a wavelet-based refinement step. MAWT opens the way for a unique approach to modeling: although speech is divided into segments, the suc...
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ژورنال
عنوان ژورنال: International Journal on Cryptography and Information Security
سال: 2012
ISSN: 1839-8626
DOI: 10.5121/ijcis.2012.2106