Title:
VOICE CODING/DECODING DEVICE AND VOICE DECODING DEVICE
Document Type and Number:
Japanese Patent JP3229784
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve the pitch predicting precision by shortening the renewal period of pitch length compared with the renewal period of pitch predicting factor.
SOLUTION: Frequency dividers 102, 107 are newly added to give the renewal period of pitch length shorter than that of pitch predicting factor. Though the instructions on analysis processing of pitch predicting factor are given to a pitch prediction analysing filter and a pitch prediction synthesizing filter with the same period as the past one, the instructions on the analysis processing of pitch length are given with a frequency faster than that in the analysis processing of the pitch predicting factor by frequency dividers 102, 107. By using these means, the renewal period of pitch length is shortened compared with the renewal period of the pitch predicting factor. Accordingly, the pitch predicting precision is improved in the voice coding/decoding device which conducts pitch prediction to plural sample length units.
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Inventors:
Tomokazu Morio
Application Number:
JP23112095A
Publication Date:
November 19, 2001
Filing Date:
September 08, 1995
Export Citation:
Assignee:
Sharp Corporation
International Classes:
G10L25/90; (IPC1-7): G10L11/04; G10L19/00; G10L19/04; G10L19/12
Domestic Patent References:
| JP333898A | ||||
| JP4298799A | ||||
| JP764600A |
Attorney, Agent or Firm:
Takaya Koike
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