Device and method for determining corelative coefficient between signals and signal sectional distance

Abstract

An apparatus and method for determining a correlation coefficient between signals and determining a signal pitch. The apparatus for determining a correlation coefficient between signals includes an operation unit which receives a sampled signal x[i+k] and a signal y[j+k] (where, k is an integer from 0 to M-1), applies the signals x[i+k] and y[j+k] to a first membership function mu L, which is a membership function of a first fuzzy set having large values, obtains a minimum value therebetween, obtains a probability P1 that all of the signals x[i+k] and y[j+k] have large values, applies the signals x[i+k] and y[j+k] to a second membership function mu s, which is a membership function of a second fuzzy set having small values, obtains a minimum value therebetween, obtains a probability P2 that all of the two signals x[i+k] and y[j+k] have small values, obtains a maximum value between the probability P1 and the probability P2, obtains a probability P3 that all of the two signals x[i+k] and y[j+k] have large or small values, increases said k in units of integers from 0 to M-1, repeatedly performs the above operations on a pair of the signals x[i+k] and y[j+k] corresponding to said k, and obtains M probabilities P3, and an addition unit which obtains a correlation coefficient indicating a degree of similarity between the two signals x[i+k] and y[j+k] by adding said M probabilities P3 input from the operation unit .

Description

[0001] This application claims priority to Korean Patent Application No. 2002-45567 filed with the Korean Intellectual Property Office on August 1, 2002, the disclosure of which is incorporated herein by reference in its entirety. technical field [0002] The invention relates to a device and a method for determining a correlation coefficient, wherein said correlation coefficient indicates the degree of similarity between signals, and to a device and a method for determining the pitch of such a signal. Background technique [0003] Speech signals are characterized by the continuous repetition of similar signals, the period of these similar signal repetitions being called a pitch. figure 1 An example of the pitch of a speech signal is shown. [0004] In the area of ​​speech coders, algorithms for speech recognition, speech synthesis, and pitch derivation are needed to encode and / or decode speech signals. In general, the algorithm used to obtain the pitch is based on the assu...

AI Technical Summary

Problems solved by technology

[0005] However, in order to obtain the pitch using the conventional method, many multiplication operations must be performed, so that the calculation time for obtaining the pitch accounts for about 25% of the entire encoding calculation time

In addition, many logic devices are required to design and process conventional algorithms for obtaining pitch using ASICs, and power consumption increases

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