Title:
【発明の名称】音声符号化装置
Document Type and Number:
Japanese Patent JP3092436
Kind Code:
B2
Abstract:
PURPOSE:To provide a voice coding device for coding voice signal to high tone quality with a lower bit rate. CONSTITUTION:A masking threshold value calculation circuit 205 calculates masking threshold value of auditory sense from the voice signal, and outputs it to a bit allocation circuit 215, and converts the masking threshold value into a filter coefficient to output to an auditory sense weighting circuit 220. The bit allocation circuit 215 allocates the number of bits in a code book in a sound source code book retrieval circuit 230 at every sub-frame based on the masking threshold value at every sub-frame.
Inventors:
Kazunori Ozawa
Application Number:
JP3210494A
Publication Date:
September 25, 2000
Filing Date:
March 02, 1994
Export Citation:
Assignee:
NEC
International Classes:
G10L19/02; G10L19/038; G10L19/04; G10L19/08; G10L19/10; G10L19/12; H03M7/30; H04B14/04; (IPC1-7): G10L19/12; G10L19/02; H03M7/30; H04B14/04
Domestic Patent References:
| JP2294700A | ||||
| JP4302532A | ||||
| JP5232998A | ||||
| JP1207799A |
Other References:
Ｄｒｏｇｏ ｅｔ．ａｌ．”Ｖｅｃｔｏｒ Ｑｕａｎｔｉｚａｔｉｏｎ Ａｎｄ Ｃｒｉｔｅｒｉａ Ｉｎ ＳＶＤ Ｂａｓｅｄ ＣＥＬＰ Ｃｏｄｅｒｓ”，ＩＣＡＳＳＰ−９０，Ｖｏｌ．１，ｐｐ３３−３６（１９９０）
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)