Title:
サブバンド符号化方式
Document Type and Number:
Japanese Patent JP4287545
Kind Code:
B2
Abstract:
A subband encoding and a decoding system are provided. The subband encoding system measures signal levels of subband signals to determine scale factors to obtain scale factor information and produces bit allocation information based on the scale factor information, scale factor flag information indicating the fact that the scale factor information has changed from that one frame earlier, and updated scale factor information indicating the scale factor information which has changed from that one frame earlier. The subband encoding system re-quantizes the subband signals using the scale factor information and the bit allocation information to provide re-quantized output signals and constructs as an encoded output signal a frame made up of the re-quantized signals, the updated scale factor information, and the scale factor flag information. The number of subbands of the subband signals to be re-quantized is determined by an upper limit frequency of an audible band. This results in a decrease in operation load of the subband encoding and decoding systems.
Inventors:
Shohei Taniguchi
Application Number:
JP21126499A
Publication Date:
July 01, 2009
Filing Date:
July 26, 1999
Export Citation:
Assignee:
Panasonic Corporation
International Classes:
H03M7/30; G06T9/00; G10L19/02; H04B1/66; H04N19/115; H04N19/122; H04N19/134; H04N19/189; H04N19/30; H04N19/40; H04N19/46; H04N19/59; H04N19/60; H04N19/65; H04N19/70; H04N19/89
Domestic Patent References:
| JP10304360A | ||||
| JP8179794A | ||||
| JP8251031A | ||||
| JP2000101519A | ||||
| JP2001044844A |
Other References:
Yu Rongshan et al.,High quality audio coding using a novel hybrid WLP-subband coding algorithm,Proceeding ot the Fifth International Symposium on Signal Processing and Its Applications (ISSPA '99),IEEE,1999年 8月22日,Volume 1,pp.483-486
Attorney, Agent or Firm:
Masaaki
Ohashi
Masanori Hirano
Hayashi Hiroki
Ohashi
Masanori Hirano
Hayashi Hiroki