TV多重ファクシミリ放送における制御信号とインパルスノイズ

抄録

A facsimile broadcasting system multiplexed with the television sound channel have been studied in Japan. In this system the facsimile signal is FM-FM modulated using the 2nd subcarrier and the facsimile control signal composed of program and page number, etc, is transmitted in NRZ code form, on the other hand the facsimile picture is transmitted in analog form. This paper describes the analysis and experiments of the impulsive noise disturbance on the reception of the facsimile control code signal. The bit error rate of the code is investigated by the analysis of the FM-FM demodulation. While, using the indoor transmitter and receiver the bit error rate and the frame error rate of the code is measured. Through the investigation it is cleared that the bit rate of 8000 bps can be used and (272,190) majority-logic-decodable-difference-cet cyclic code is effective for the frame error correction.