| 摘要 |
PURPOSE:To increase the speed and accuracy of an input/output operation of a decoder with an RAM by using an ROM to produce the address of a PQ correcting data word. CONSTITUTION:The word number included in a field is added 15 with the output of an FF16, and this added output is supplied to the FF16. The FF16 delivers a signal showing the reference address of the field synchronously with a field synchronizing signal. While a counter 18 counts the byte synchronizing signals and supplies them to an ROMH19. Then the row of the output data of a data RAM is decided by a counter 20, and the relative relation between the address of the RAM data and that of the PQ correcting data word is stored to an ROMI21. The outputs of the ROMH19 and ROMI21 are added 22 together, and this added value is added 23 with the output of the FF16 to obtain a signal which shows the address of the PQ correcting data word. |
