Auf Block Umschaltung basierender Teilband-Audiokodierer

• Main Author: ARAKI, TADASHI
• Format: Patent
• Language: German
• Published: 10.11.2005
• Edition: 7
• Subjects: ACOUSTICS; BASIC ELECTRONIC CIRCUITRY; CODE CONVERSION IN GENERAL; CODING; DECODING; ELECTRICITY; MUSICAL INSTRUMENTS; PHYSICS; SPEECH ANALYSIS OR SYNTHESIS; SPEECH OR AUDIO CODING OR DECODING; SPEECH OR VOICE PROCESSING; SPEECH RECOGNITION

A digital acoustic signal coding apparatus, a method of coding the digital acoustic signal, and a recording medium for recording a program of coding the digital acoustic signal are respectively realized. It is possible to provide the digital acoustic signal coding method and apparatus, in which, corresponding to the difference between the sampling frequencies of the input acoustic signal, the short blocks can be suitably classified into groups without deteriorating the sound quality and the difference between the long/short blocks can be judged. The coding apparatus is composed of a calculation medium for calculating the sensation entropy of a input acoustic signal calculated per each of the respective short sensation blocks; a sensation entropy sum total calculation medium for obtaining the total sum in the frame of the sensation entropy; a comparison medium for comparing the absolute value of the difference between the respective sum totals in the frame of the sensation entropy of the two frames being successive with a previously determined threshold value; and a long/short block judgment medium for judging whether the long blocks or the short block should convert the block of the input acoustic signal on the basis of the comparison result.