Title:
【発明の名称】音声符号化装置
Document Type and Number:
Japanese Patent JP3256215
Kind Code:
B2
Abstract:
PURPOSE:To make well encoding of sound quality with a relatively small calculation quantity and memory quantity by expressing sound source signals by the linear coupling of the signals from 1st and 2nd code books, quantizing and outputting at least one gain of pitch parameters and the sound source signals by using a 3rd code book. CONSTITUTION:This system includes a buffer memory 110, an LPC calculating circuit 130, a quantization circuit 140, a sub-frame dividing circuit 150, 1st and 2nd code book searching circuits 230, 270 and a gain code book 287. The system is provided with the 1st code book 235 stored therein with the signals constituted by determining pitch parameters so as to approximate the reproduced signals to voice signals and making learning in accordance with the voice signals and the 2nd code book 275 stored with the signals having predetermined characteristics. The sound source signals of the voice signals are expressed by the linear coupling of the signals selected from the 1st and 2nd code books and at least one gain of the pitch parameters and the sound source signals is quantized and outputted by using the 3rd code book 287. The good characteristics are obtd. with the smaller calculation quantity in this way.
Inventors:
Kazunori Ozawa
Application Number:
JP4295690A
Publication Date:
February 12, 2002
Filing Date:
February 22, 1990
Export Citation:
Assignee:
NEC
International Classes:
G10L19/00; (IPC1-7): G10L19/00
Domestic Patent References:
| JP1233500A | ||||
| JP6466700A | ||||
| JP154497A | ||||
| JP63113600A |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)