Title:
信号解析及び合成のための適応型混合変換
Document Type and Number:
Japanese Patent JP4689625
Kind Code:
B2
Abstract:
Analysis and synthesis filter banks such as those used in audio and video coding systems are each implemented by a hybrid transform that comprises a primary transform in cascade with one or more secondary transforms. The primary transforms for the filter banks implement an analysis/synthesis system in which time-domain aliasing artifacts are cancelled. The secondary transforms, which are in cascade with the primary transforms, are applied to blocks of transform coefficients. The length of the blocks is varied to adapt the time resolution of the analysis and synthesis filter banks. One or more sets of hybrid-transform coefficients resulting from a secondary transform are enoded the. The length of the secondary transform is adapted in response to the block-length control signal. One or more sets of hybrid-transform coefficients are quantized according to a perceptual model to generate encoded information.
Inventors:
Vinton, Mark Stuart
Davidson, Grant Allen
Davidson, Grant Allen
Application Number:
JP2006554100A
Publication Date:
May 25, 2011
Filing Date:
January 21, 2005
Export Citation:
Assignee:
DOLBY LABORATORIES LICENSING CORPORATION
International Classes:
H03M7/30; G06F17/14; G06T9/00; G10L19/02; H04N7/26; H04N7/30
Domestic Patent References:
| JP11075157A | ||||
| JP2002118517A | ||||
| JP2002132295A | ||||
| JP2003345779A | ||||
| JP2004004554A | ||||
| JP2002091500A |
Attorney, Agent or Firm:
Yuzo Yamazaki
Naoto Sugiyama
Shirogane Expo
Toshiaki Akamatsu
Okuko Masako
Ichiro Tasaka
Ono Wataru
Naoto Sugiyama
Shirogane Expo
Toshiaki Akamatsu
Okuko Masako
Ichiro Tasaka
Ono Wataru