| 摘要 |
PROBLEM TO BE SOLVED: To form a Miller signal having reliability without making a device high cost by designing a reference value transmitter so that the Miller signal is applied to an adaptive reference value transmitter as a variable input. SOLUTION: A track detector 1 operates in a digital base. At first, a modulated signal HF being analog is digitized by an analog/digital converter 6 and, next, it is inverted by an inverter 7. The inverted signal is delivered to the input of the track detector 1 as a signal HF1 and an envelope detector 2 forms a high-order envelope to be compared with a reference value R to be outputted by a reference value transmitter 4. Then, a comparator unit 3 generates a Miller signal M to output it at one side and in the other side, when it is proper, it is sued by the reference value transmitter 4 adapting the reference value R. |
