Title:
METHOD AND DEVICE FOR CODING AUDIO SIGNAL, AND METHOD AND DEVICE DECODING FOR CODED AUDIO SIGNAL
Document Type and Number:
Japanese Patent JP3391686
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce trouble of calculation and memory requirements by coupling a quantized error signal and a prediction coefficient and making coded audio signal.
SOLUTION: A signal processing unit 10 makes a set of a quantized frequency sub-band signal using a quantized frequency sub-band error signal E(k). Each signal is applied to a filter bank 11, and the bank 11 makes a quantized time region signal adapting a discrete cosine conversion inversely corrected for each signal. This signal is applied to a long period prediction value tool 12, but this tool 12 receives an audio input signal (x) also. The prediction value tool 12 eliminates redundant component in an audio signal existing in the present frame based on data previously quantized using the long period prediction value. A quantized error signal and a prediction coefficient A are coupled by a bit stream multiplexer 5, and transmitted through a transmitting channel 6.
Inventors:
Phosphorus in
Application Number:
JP6351498A
Publication Date:
March 31, 2003
Filing Date:
March 13, 1998
Export Citation:
Assignee:
Nokia Mobile Phones Limited
International Classes:
G10L19/04; H03H21/00; H03M7/30; H03M7/36; H03M13/00; H04B1/64; H04B1/66; H04N7/167; H04N7/50; G10L19/02; G10L19/10; G10L; (IPC1-7): G10L19/04; G10L19/02; H03M7/30
Domestic Patent References:
| JP8137494A | ||||
| JP2123828A | ||||
| JP643898A | ||||
| JP9319398A | ||||
| JP1011094A | ||||
| JP4151953A | ||||
| JP4177300A | ||||
| JP5113799A |
Attorney, Agent or Firm:
Takashi Ishida (3 others)
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