Title:
WIDE BAND VOICE SIGNAL RESTORATION METHOD
Document Type and Number:
Japanese Patent JP3230790
Kind Code:
B2
Abstract:
PURPOSE: To restore wide band voice signals without extracting the pitch of an input sound signal.
CONSTITUTION: Input narrow band signals are LPC-analyzed, quantized by a narrow band code book 103 and decoded by a wide band code book 105. The input narrow band voice signals are coded by a CELP type coding section 201. Then, a zero is added to every sample of the sound source signals used in the last by a zero stuffing process section 206. The zero stuffed signals are made into the sound source signals. Then, filter coefficients are set by a decoded spectrum. Finally, an LPC synthesis section 106 is used to synthesize wide band voice signals.
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Inventors:
Masanobu Abe
Application Number:
JP20962194A
Publication Date:
November 19, 2001
Filing Date:
September 02, 1994
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G10L19/038; G10L19/06; G10L19/08; G10L21/0388; G10L21/057; H04B14/04; (IPC1-7): G10L19/08; G10L19/00; H04B14/04
Domestic Patent References:
| JP6118995A | ||||
| JP756599A | ||||
| JP6195098A | ||||
| JP5640900A | ||||
| JP612098A |
Attorney, Agent or Firm:
Suguru Kusano