摘要 |
PROBLEM TO BE SOLVED: To provide an acoustic signal encoding device preventing the deterioration of objective characteristics by using no parameter of a psychological acoustic model on the basis of human hearing sense characteristics or replacing a matter quantized effectively on signal. SOLUTION: The acoustic signal encoding device is provided with a psychological acoustic model part 1 including an FFT operation part 11, a block type discrimination part 12 and an SMR operation part 13, a MDCT processing part 2, a repeating loop processing part 3 including an allowable error amount calculation part 31, a bit amount/error amount control part 32, a normalizing processing part 33, a quantizing part 34 and a Huffman encoding part 35, a multiplexing part 4 for multiplexing a processing block type from the block type discrimination part, a scale factor from the bit amount/error amount control part and a Huffman encoding book number and a Huffman symbol from the Huffman encoding part, a sine wave judging part 14a for judging a sine wave by utilizing the FFT frequency spectrum of the FFT operation part, and means 16, 15 for changing over whether it utilizes the output value of the SMR operation part on the basis of the judged result of the sine wave. |