Title:
CODING AND DECODING METHODS IN ACOUSTIC SIGNAL CONVERSION
Document Type and Number:
Japanese Patent JP3353868
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a high quantization efficiency.
SOLUTION: Input signals are converted into frequency domain coefficients. Prescribed number of coefficients having large values are extracted from the frequency domain coefficients. The extracted coefficient numbers are coded by a coding means 14 and outputted as a sample order index IS. The values of the extracted coefficients are also coded by a coding means 15 and outputted as a sample value index IR. The index IR is decoded by a decoding means 22 in a decoder 21 and frequency domain coefficients are obtained. The inputted index IS is decoded by a decoding means 25 and coefficient numbers are obtained. Then, the decoded coefficients are arranged in the positions of decoded coefficient numbers in the order of larger ones by a means 22. A means 26 reconstructs the frequency domain coefficients and converts them into time domain signals.
Inventors:
Naoki Iwakami
Takehiro Moriya
Satoshi Miki
Kazunaga Ikeda
Takehiro Moriya
Satoshi Miki
Kazunaga Ikeda
Application Number:
JP26123695A
Publication Date:
December 03, 2002
Filing Date:
October 09, 1995
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G10L19/00; G10H1/00; G10L19/02; G10L19/032; G10L21/003; G10L21/04; H03M7/30; (IPC1-7): G10L19/02; G10L19/00
Domestic Patent References:
| JP463400A | ||||
| JP6453642A | ||||
| JP6337400A | ||||
| JP63142399A | ||||
| JP6259099A |
Attorney, Agent or Firm:
Suguru Kusano