Multi-dimensional sub-band coding: Some theory and algorithms
نویسندگان
چکیده
منابع مشابه
Sub-band Coding of Speech
The results of the investigation of an 8-band sub-band coder with dynamic bit allocation at the rate of 16 Kbits/sec is presented. The band-partitioning technique adopted is the Quadrature Mirror Filtering (QMF) method and particular attention is paid to the problems involved with the use of such filters in a sub-band coder. The sub-band signals are quantized using Adaptive Pulse Coded Modulati...
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• A simple source coder is shown in Fig. 3.1. Here, the sampled speech is passed through a quantizer. The quantizer can be represented by a number of break points which partition the input signal amplitude into disjoint regions. The regions are specified by an index. The index representing a region can be mapped into a quantized value x̂[n] which is used for all input all signal values that fall...
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It is well-known that the Shannon Sampling Theorem allows us to fully recover a continuous-time bandlimited signal from its digital samples, as long as the sampling rate to be chosen is not smaller than the Nyquist frequency. This theory applies to all bandlimited signals, which may or may not occupy the entire frequency band. Hence, it is intuitively convincing that for continuous-time signals...
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This paper describes a hybrid sub-band speech coding scheme based on sinusoidal coding and CELP. Purely voiced speech is encoded using sinusoidal coding techniques and phase information is selectively transmitted. For mixed and unvoiced speech, the lower band is processed by sinusoidal coding algorithms while the upper band is encoded using CELP. To accommodate the extra bandwidth required by t...
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This thesis investigates image coding using a combination of sub-band analysis/synthesis techniques and vector quantization. The design of a vector quantizer for image sub-bands is investigated, and the interplay between multi-rate filter banks and the vector coder is examined. The goal is twofold, first, a vector quantizer that is bounded by a distortion criterion versus an apriori fixed limit...
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ژورنال
عنوان ژورنال: Signal Processing
سال: 1984
ISSN: 0165-1684
DOI: 10.1016/0165-1684(84)90012-4