Title:
【発明の名称】音声符号化復号化方式
Document Type and Number:
Japanese Patent JP2853170
Kind Code:
B2
Abstract:
PURPOSE:To reproduce a voice excellently with a small arithmetic quantity irrelevantly to a bit rate by dividing a frame into subframes corresponding to a pitch period and using multipulses which are found by pitch interpolation and multipulses which are found on the whole frame without pitch prediction. CONSTITUTION:The voice signal from an input terminal 100 is divided into specific frames and an LPC and a pitch analysis part 150 finds an LPC coefficient of specific degree as a spectrum parameter representing a spectrum envelope from the voice signal of a frame. A pitch interpolation multipulse calculator 250 divides the frame into subframes by using a pitch period, finds the amplitude and position of multipulses in one specific section, and finds gain correction coefficients and phase correction coefficients of other subframes. Then a sound source signal is restored by specific arithmetic operation through a subtracter 260 and a multipulse calculation part 270 and then processed by composition. Consequently, the excellent voice can be reproduced with a small arithmetic quantity irrelevantly to the bit rate.
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Inventors:
OZAWA KAZUNORI
Application Number:
JP13952489A
Publication Date:
February 03, 1999
Filing Date:
May 31, 1989
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
G10L19/04; G10L19/08; G10L19/10; H03M7/30; H04B14/04; (IPC1-7): G10L9/14; H03M7/30; H04B14/04
Domestic Patent References:
| JP61148500A | ||||
| JP1314300A | ||||
| JP1293400A |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)