Linear predictive coding CODE
2016-08-23
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Linear predictive coding(LPC) is a digital method for analysis of an analog signal in which a particular value is predicted by a linear function of the past values of the signal. At a particular time, t, the speech sample s(t) is represented as a linear sum of the p previous samples. The most important aspect of LPC model is the linear predictive filter which allows the next sample value to be determined by a linear combination of previous samples. The general algorithm for linear predictive coding involves an analysis or encoding part and a synthesis or decoding part. In the analysis, LPC takes the speech signal in blocks or frames of speech and determines the input signal and the coefficients of the filter that will be capable of reproducing the current block of speech [5] [6]. This information is quantized and transmitted. In the synthesis, LPC rebuilds the filter based on the coefficients received. The filter can be thought of as a tube which, when given an input signal, attempts t
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