High-quality memoryless subband coding of impulse responses at 22 bits per frame
نویسنده
چکیده
A method for efficient quantization of speech spectral models is proposed. The impulse response of the model is coded in two spectral subbands of unequal width. The distortion measure used is a squared error between impulse responses. The quality obtained at 22 bits per frame is as good as that of Split Vector Quantization of Line Spectral Frequencies at 24 bits per frame.
منابع مشابه
Subband Compression of High Quality Color Still Images
This paper presents a complete coding system for compression of natural color still images represented with 24 bits per pixel. The original 8-bit red, green, and blue (RGB) image components are rst transformed to a luminance (Y) and two chrominance components (Cb, Cr) according to the ITU-R Recommendation 601 1]. Each of the Y, Cb, and Cr tristimulus values are then decomposed separately in a s...
متن کاملQuantization Noise Power Injection In Subband Audio Coding Using Low Selectivity Filter Banks
The ISO-MPEG standards are widely used for high quality audio coding. They use perceptual models that require high frequency resolution. This implies two characteristics: they use high selectivity filter bank to decompose the audio signal, and the FFT frame length for the frequency masking threshold calculations is long. Both characteristics carried out a very high delay coding. In applications...
متن کاملA Perceptually Based Embedded Subband Speech Coder - Speech and Audio Processing, IEEE Transactions on
A new scheme for robust, high-quality, embedded speech coding based on subband decomposition and perceptually optimized bit allocation and prioritization is presented. An infinte impulse response (IIR) quadrature mirror filterbank (QMF) performs subband decomposition. A perceptual model, computed using subband spectral analysis, optimizes the coder’s perceptual quality. Dynamic bit allocation a...
متن کاملEfficient Spectral Magnitude Quantisation for High-Quality Sinusoidal Speech Coders
An efficient method for quantising the magnitude of the LPresidual spectrum is proposed for high quality sinusoidal speech coding. It exploits the intra-frame perceptual preference of the magnitudes using mel-scale-based warping, and the inter-frame statistical correlation of the successive magnitude vectors using predictive coding. A switched quantiser between memoryless and predictive coding ...
متن کاملAlgorithm for Jointly Optimized Analysis and Synthesis Fir Filter Banks
An algorithm for jointly optimizing uniform analysis and synthesis FIR filter banks for a given input power spectral density is proposed. The FIR subband coder is optimized with respect to the minimum block mean square error between the output and the input signals under a bit constraint. The subband quantizers are modeled as additive, signal-independent, white noise sources. Illustrative examp...
متن کامل