PARCORPartial Correlation
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The PARCOR method was put to practical use as an audio response system in 1971 and was used for various telephone data services.
In 1975, fostering the advancement of an algorithm for PARCOR, he developed the line spectrum pair (LSP) method by introducing the line spectrum representation of linear predictor coefficients of speech signals.
In each case, these systems were developed based on fundamental technologies such as PARCOR and LSP pioneered by Dr.