Title:
QUANTIZATION STEP SIZE DECIDING METHOD OF DIGITAL SIGNAL ENCODING AND DIGITAL SIGNAL ENCODING DEVICE
Document Type and Number:
Japanese Patent JP3884410
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce a quantization level without increasing a quantization error and to improve encoding efficiency when a quantization step size of digital signal encoding is decided.
SOLUTION: A small block is previously quantized by a reference quantization step size obtained in accordance with a rule which is previously decided. Common divisor is calculated from the obtained quantization levels of the small blocks. The quantization step size used for actual quantization is decided from the common divisor and the reference quantization step size.
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Inventors:
Jun Shimizu
Application Number:
JP2003159789A
Publication Date:
February 21, 2007
Filing Date:
June 04, 2003
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
H03M7/36; H04N7/24; H04N19/00; H04N19/126; H04N19/134; H04N19/176; H04N19/189; H04N19/196; H04N19/625; (IPC1-7): H03M7/36; H04N7/24
Domestic Patent References:
| JP6350985A | ||||
| JP8037643A | ||||
| JP2005522118A | ||||
| JP2004297184A | ||||
| JP10032830A | ||||
| JP2000316153A | ||||
| JP10032816A | ||||
| JP7111592A |
Attorney, Agent or Firm:
Naotaka Ide
Toshinao Shimodaira
Toshinao Shimodaira
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