| 摘要 |
PURPOSE:To transmit certainly a varied output by modifying the output by a variation flag in every transmission period, and transmitting the result and comparing an echo-packed output with the output transmitted at present to resend it. CONSTITUTION:The last transmit data is held by a holding means 8, and the output of a control part 7 is compared with the output of the holding means 8 in every control period; when they are not coincident with each other, the variation flag 10 is set and the last transmit data is modified and transmitted in every transmission period. At the same time, the 2nd comparing means 13 compares the echo-packed data with the current transmit output held by an output means 11. When they are coincident, the variation flag 10 is reset and the last transmit data is transferred to the holding means 8. When they are not coincident, the last output and variation flag 10 are held and the last data is resent. |
