ASK MODULATION SIGNAL RECEIVER

摘要

PURPOSE: To improve the reception precision of the ASK modulation signal receiver to the utmost. CONSTITUTION: An antenna 20 receives a radio wave resulting from a signal obtained by coding the high level signal and the low level signal of a digital data signal with a different time width and applying ASK modulation to the coded signal, the received signal is detected and the result is compared with a setting threshold level to obtain a high level signal and a low level signal. The time width of the high level signal or the low level signal is compared with a discrimination use setting time width to receive the ASK modulation signal to be converted into digital data. When a signal being an abnormal signal with a very small time width shorten than the discrimination use setting time width is detected, a signal with a time width being a sum of the time width of the abnormal signal and a time width of a succeeding and a preceding signal is compared with a signal with the discrimination use setting time width and then the resulting signal is converted into digital data.