Title:
ACOUSTIC SIGNAL CONVERSION DECODING METHOD
Document Type and Number:
Japanese Patent JP3186020
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the number of operation steps by reducing calculation and division of a power spectrum envelope in a decoder.
SOLUTION: This method reproduces a signal by decoding a quantized sign after normalizing it by a square root power spectrum envelope, reproducing an inputted linear prediction parameter by a means 56, performing an operation to obtain a power spectrum concerning predetermined sparse frequency points from this linear prediction parameter, and a square root power spectrum envelope value is obtained by means 101. About an unoperated frequency point in the part where this change is comparatively large, the square root power spectrum envelope value can be determined by a means 103 by using the reproduction value of means 56, and about an unoperated frequency point in the part where this change is small, the square root power spectrum envelope value is obtained by interpolating them from their fore and aft values.
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Inventors:
Takehiro Moriya
Naoki Iwakami
Naoki Iwakami
Application Number:
JP24743695A
Publication Date:
July 11, 2001
Filing Date:
September 26, 1995
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G10L19/038; G10L13/00; G10L19/04; G10L19/16; H03M7/30; (IPC1-7): G10L19/00; G10L19/04; H03M7/30
Domestic Patent References:
| JP8194497A | ||||
| JP7261800A |
Attorney, Agent or Firm:
Suguru Kusano