Title:
SOUND DECODER
Document Type and Number:
Japanese Patent JP2616549
Kind Code:
B2
Abstract:
PURPOSE: To provide a sound decoder by which background noise is more excellently expressed by processing only the decoder side with a low bit rate without changing the encoder side at all when background noise is superimposed on sound.
CONSTITUTION: A decoding circuit 100 receives a signal from a sound encoder. A sound detection circuit 110 detects soundless section and sound section. A driving signal constituting circuit 140 calculates a driving signal using the received sound source signal, pitch period and average amplitude. A signal reproducing section 140 reproduces a signal s(n) by driving a filter constituted by using a spectrum parameter. A searching circuit 180 stores a random number signal code vector set of a beforehand set number of bits as a code book 200, a random code vector is searched and the circuit 180 selects a best one. A signal reproducing circuit 210 again reproduces a signal using the selected random number code vector.
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Inventors:
Kazunori Ozawa
Application Number:
JP31052193A
Publication Date:
June 04, 1997
Filing Date:
December 10, 1993
Export Citation:
Assignee:
NEC
International Classes:
G10L19/038; G10L19/012; G10L19/04; G10L19/08; (IPC1-7): G10L9/14; G10L9/18
Domestic Patent References:
| JP5122165A | ||||
| JP58171095A | ||||
| JP5265496A | ||||
| JP3243999A |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)