Title:
【発明の名称】無音圧縮音声符号化復号化装置
Document Type and Number:
Japanese Patent JP2900987
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve transmission efficiency and compression efficiency and to realize a natural call. SOLUTION: An LPC analyzer 13 performs linear predictive analysis of a sound signal of a telephone band of a soundless section detected by a sound detector 12, and calculates an occurrence coefficient of a random noise. A selection circuit 16 selects and outputs any one among the analysis result of the LPC analyzer 13 and a digital sound signal delayed by a delay buffer 15 and 'no data' according to the detection result of the sound detector 12 and the detection result of the sound detector 12 delayed by a delay circuit 14. A synthesis filter 26 generates the random noise from a random number signal of a random number generator 25 based on a coefficient from a sound encoding part 1 inputted through a switch 22. A selection circuit 28 selects and outputs any one side between a regenerative sound signal from a sound decoder 24 and the random noise from the synthesis filter 26 according to the detection result of a sound/soundless data detector 21 delayed by the delay circuit 27.
Inventors:
WAKE YASUHIRO
Application Number:
JP25169195A
Publication Date:
June 02, 1999
Filing Date:
September 29, 1995
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
G10L25/48; G10L19/00; G10L19/012; G10L19/04; G10L19/06; G10L19/16; G10L25/78; H03M1/06; H04M7/00; H04Q11/04; (IPC1-7): G10L9/14; G10L3/00; H04Q11/04
Domestic Patent References:
| JP236628A | ||||
| JP4258037A | ||||
| JP60107933A | ||||
| JP2206246A |
Attorney, Agent or Firm:
Yanagi Kawa Shin