FACSIMILE RECEIVING DEVICE

摘要

PURPOSE:To enhance the quality of the received picture, by receiving and demodulating the facsimile FAX signal transmitted in multiple value and then converting the FAX signal into the binary signal after passing through the LPF. CONSTITUTION:The signal sent from radio receiving antenna 41 is supplied to radio receiver 42 and then amplified and demodulated 43 to be then supplied to binary coding circuit 46 through LPF45. On the other hand, the carrier output of receiver 42 receives the wave detection by wave detector 44 and is then applied to control input of LPF45. As the mixture of the noise is reduced when the intensity of the radio carrier wave is high, the cut-off frequency of LPF45 is increased by the output of detector 44. While the cut-off frequency of LPF45 is decreased when the intensity of the radio carrier wave is low since the mixture of the noise is increased. And the frequency is set to the value near 1/4 frequency of the maximum picture element number which is transmitted in a second. In such way, the recording of the received picture is always ensured in the optimum state.