Index assignment in vector quantisation for channels with memory - Vision, Image and Signal Processing, IEE Proceedings-
نویسنده
چکیده
The study prcsents a formulation of a Hadaniard framework for analysing the vector quantisation aver channels with memory. In seeking faster response, classes of index assignments are defined in terms of the Hadamard transform of channel transition probabilities, An index assignment algorithm is developed that achieves high robustness against channel errors, and its performance i n vector quantisation of Gauss-Markov sources under noisy channel conditions is illustrated.
منابع مشابه
Colour quantisation technique based on image decomposition and its embedded system implementation - Vision, Image and Signal Processing, IEE Proceedings-
A new colour quantisation (CQ) technique and its corresponding embedded system realisation are introduced. The CQ technique is based on image split into sub-images and the use of Kohonen self-organised neural network classifiers (SONNC). Initially, the dominant colours of each sub-image are extracted through SONNCs and then are used for the quantisation of the colours of the entire image. The p...
متن کاملUse of multiple vector quantisation for semicontinuous-HMM speech recognition - Vision, Image and Signal Processing, IEE Proceedings-
Although the continuous hidden Markov model (CHMM) technique seems to be the most flexible and complete tool for speech modelling, it is not always used for the implementation of speech recognition systems because of several problems related to training and computational complexity. Thus, other simpler types of HMMs, such as discrete (DHMM) or semicontinuous (SCHMM) models, are commonly utilise...
متن کاملA Fast Index Assignment Algorithm for Vector Quantization over Noisy Transmission Channels
Vector quantisation, a widely used technique in low-bit rate coding of speech signals, is highly sensitive to errors in the transmitted codeword caused by noise in the transmission channel. This paper describes an e cient index assignment algorithm, based on Hall's solution to the quadratic assignment problem, used to re-order the codebook such that the e ect of transmission errors is minimised...
متن کاملAn Improved Vector Quantisation Algorithm for Speech Transmission Over Noisy Channels
Vector quantisation (VQ) is a method widely used in low bit-rate coding and transmission of speech signals. Unfortunately, a single bit error in the transmitted index, due to noise in the transmission channel, could degrade perceived speech quality at the receiver quite dramatically, as the reference vector retrieved by the corrupted index may di er greatly from the vector corresponding to the ...
متن کاملMedian-based post-processing for VQ image transmission over noisy channels
For image transmission over noisy channels, the VQ paradigm is a strong competitor. We propose a post-processing scheme able to improve the perceptual quality of the VQ reconstructed image, for various types of noisy channels, when it is combined with an appropriate index assignment. For binary symmetric channels, we use the index assignment resulting from the LBG design of the codebook, which ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004