MUSICAL SOUND CODING METHOD, MUSICAL SOUND DECODING METHOD AND RECORDING MEDIUM RECORDED WITH PROGRAM TO EXECUTE THESE METHODS

摘要

PROBLEM TO BE SOLVED: To realize a coding and decoding method that eliminates the waste and easily edits and processes for the system in which acoustic information being transmitted is received, temporarily recorded in a recording medium, reproduced, edited, processed and speed varied resulting in a low transmission efficiency and unnecessary amount of computations.;SOLUTION: Acoustic signals in a time domain are converted into a time frequency domain by a band dividing through QMF and MDCT and classification information of coefficient groups by the size of the absolute value of the conversion coefficients and time information of detecting the generation and the extinction of peaks in a frequency domain are coded along with the coefficient groups in the time frequency domain obtained above. By conducting the coding indicated above, efficient transmission of acoustic signals and editing and processing at the decoding side are easily executed.;COPYRIGHT: (C)2001,JPO