Global Patent Index - EP 1018082 A1

EP 1018082 A1 2000-07-12 - VARIABLE BLOCK SIZE 2-DIMENSIONAL INVERSE DISCRETE COSINE TRANSFORM ENGINE

Title (en)

VARIABLE BLOCK SIZE 2-DIMENSIONAL INVERSE DISCRETE COSINE TRANSFORM ENGINE

Title (de)

VARIABLE BLOCKGRÖSSE, ZWEIDIMENSIONALE, INVERSE DISKRETE COSINUS-TRANSFORMATIONSVORRICHTUNG

Title (fr)

MOTEUR DE TRANSFORMATION EN COSINUS DISCRETS INVERSE (IDCT) BIDIMENSIONNEL POUR LONGUEUR DE BLOC VARIABLE

Publication

EP 1018082 A1 (EN)

Application

EP 98942197 A

Priority

  • US 9817423 W
  • US 91809097 A

Abstract (en)

[origin: WO9910818A1] A variable block size 2-D IDCT engine (10) which can compute any arbitrary mix of transforms. A first 1-D IDCT processor (20a) computes the transform of the data block by columns and stores the intermediate results in a transposition memory. A second 1-D IDCT processor (20b) computes the transform of the intermediate results by rows. Different mix of transforms can be easily performed by correctly ordering the input data, selectively combining the input data before the butterfly stages, and controlling the additions and multiplications at each stage of butterfly. The unnecessary butterflies are placed in the bypass mode. The butterflies can be implemented with serial adders (56) and bit-serial multipliers to greatly simplify the hardware design and minimize the routing requirements between successive stages of butterfly. The fully pipelined structure allows the IDCT engine to maintain a throughput rate of one pixel per clock cycle.

IPC 1-7 (main, further and additional classification)

G06F 17/14

IPC 8 full level (invention and additional information)

G06F 17/14 (2006.01)

CPC (invention and additional information)

G06F 17/147 (2013.01)

Citation (search report)

See references of WO 9910818A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 9910818 A1 19990304; AU 9030298 A 19990316; CN 1268231 A 20000927; EP 1018082 A1 20000712

INPADOC legal status


2002-10-09 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20020301

2000-07-12 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000223

2000-07-12 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE