ENCODING DEVICE AND ENCODING METHOD

摘要

PROVIDED IS AN ENCODING DEVICE WHICH CAN REDUCE THE ENCODING DISTORTION AS COMPARED TO THE CONVENTIONAL TECHNIQUE AND CAN OBTAIN A PREFERABLE SOUND QUALITY FOR AUDITORY SENSE. IN THE ENCODING DEVICE, A SHAPE QUANTIZATION UNIT (111) QUANTIZES THE SHAPE OF AN INPUT SPECTRUM WITH A SMALL NUMBER OF PULSE POSITIONS AND POLARITIES. THE SHAPE QUANTIZATION UNIT (111) SETS A PULSE AMPLITUDE WIDTH TO BE SEARCHED LATER UPON SEARCH OF THE PULSE POSITION TO A VALUE NOT GREATER THAN THE PULSE AMPLITUDE WIDTH WHICH HAS BEEN SEARCHED PREVIOUSLY. A GAIN QUANTIZATION UNIT (112) CALCULATES A GAIN OF A PULSE SEARCHED BY THE SHAPE QUANTIZATION UNIT (111) FOR EACH OF BANDS.