Title:
ENCODER AND DECODER
Document Type and Number:
Japanese Patent JP3519859
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain coded and decoded signals without the power loss of an original signal, by providing a bit assigning means and a quantization means, etc., quantizing plural partial band signals generated by a band dividing means based on bit assigning information generated by this assigning means.
SOLUTION: A band dividing part 1 divides an input signal into plural partial bands and outputs a partial band signal. An acoustic sense model part 3 spectrum-analyzes the input signal, furthermore analyzes it based on human acoustic sense characteristic and calculates an evaluation function for executing optimum bit-assigning by a bit assigning part 4 in consideration of a maximum value from a maximum value detection part 2. The part 4 decides optimum bit assignment for each partial band based on this evaluation function. A quantization part 5 normalizes the partial band signal in each partial band from the part 1 by the maximum value from the part 2 for improving quantization efficiency and quantizes and encodes it according to bit assignment from the part 4.
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Inventors:
Wada, Tetsuro
Sugino, Yukimasa
Ebisawa, Hideaki
Kono, Noriaki
Naito, Hisashi
Sugino, Yukimasa
Ebisawa, Hideaki
Kono, Noriaki
Naito, Hisashi
Application Number:
JP6998496A
Publication Date:
April 19, 2004
Filing Date:
March 26, 1996
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
G10L19/00; G10L19/02; G10L19/035; H03M7/30; H04B14/04; (IPC1-7): H03M7/30; G10L19/00; G10L19/02; H04B14/04
Attorney, Agent or Firm:
曾我 道照 （外４名）