Proceedings ArticleDOI
A computationally efficient wavelet transform CELP coder
J. Ooi,V. Viswanathan +1 more
- pp 101-104
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TLDR
A wavelet-transform-based CELP coder design is presented in this paper for high-quality speech coding at about 4.8 kbits/s, and subjective speech quality tests show that the wavelet coder was preferred 61% of the time over FS 1016.Abstract:
A wavelet-transform-based CELP coder design is presented in this paper for high-quality speech coding at about 4.8 kbits/s. The coder quantizes the second residual using a wavelet transform approach instead of the stochastic-codebook-based vector quantization normally used in CELP coders, including the U.S. Federal Standard FS 1016 coder at 4.8 kbits/s. The wavelet coder improves the computational efficiency for encoding the second residual by requiring only 1.2 MIPS instead of 8.3 MIPS required by FS 1016. Subjective speech quality tests involving pairwise comparisons show that the wavelet coder was preferred 61% of the time over FS 1016. >read more
Citations
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Journal ArticleDOI
A Novel Audio Coding Scheme Using Warped Linear Prediction Model and the Discrete Wavelet Transform
Mohamed Deriche,D. Ning +1 more
TL;DR: A novel audio coder using the discrete wavelet transform (DWT) and warped linear prediction (WLP) that allows for the control of frequency resolution to closely match the response of the human auditory system is presented.
Proceedings ArticleDOI
Hybrid LPC and discrete wavelet transform audio coding with a novel bit allocation algorithm
S. Boland,Mohamed Deriche +1 more
TL;DR: Objective and subjective results suggest that the proposed coder operating at 90-96 kb/s has a performance comparable to that of the MPEG layer II codec operating at 128 kb/S.
Proceedings ArticleDOI
Speech coding by wavelet representation of residual signal
TL;DR: This work proposes and analyze a speech coder which utilizes a wavelet representation of the residual signal, and provides a detailed description of the proposed wavelet-based coder, capable of producing high quality speech at 1O kbits/s.
Patent
Speech compression coding with discrete cosine transformation of stochastic elements
Jun Yamane,Hiroki Uchiyama +1 more
TL;DR: In this article, a digital speech waveform is divided into frames and sub-frames, and a second error signal is calculated as a result of subtracting, from the subframes, pitch component speech generated from the pitch elements and spectrum envelope elements.
Proceedings ArticleDOI
A new wavelet transform-based CELP coder with band selection and selective VQ
TL;DR: The proposed algorithm adopts a band selection and selective vector quantization (VQ) of DWT coefficients that achieves about 0.41-1.14 dB improvement in segmental SNR while considerably reducing the computational complexity compared with the conventional coders.
References
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Book ChapterDOI
The Dod 4.8 Kbps Standard (Proposed Federal Standard 1016)
TL;DR: A code excited linear predictive (CELP) coder, jointly developed by the DoD and ATT it’s even comparable to 32,000 bps continuously variable slope delta modulation (CVSD) and is robust in acoustic noise, channel errors, and tandem coding conditions.
Proceedings ArticleDOI
Low bit rate transparent audio compression using a dynamic dictionary and optimized wavelets
D. Sinha,A.H. Tewfik +1 more
TL;DR: The authors propose an audio synthesis/coding method which employs an optimized wavelet-transform (WT)-based adaptive transform coding to exploit perceptual masking and a dynamic dictionary is used to extract source redundancies.