To measure the transmission delay time of a transmission signal in a transmission section, with a simple arrangement.
A TS (transport stream), which is uniquely determined in a unit period in which a time difference between the cycle timing of a 1 pps signal obtained from a GPS receiver 101 and the frame head corresponds to a least common multiple of the time length and frame length of the 1 pps signal, is generated in a TS-TEST signal generating apparatus 102 of a broadcasting station 100A. The TS is modulated into an OFDM signal by an OFDM modulator 103. A frame within the unit period is identified from the received TS by a delay measuring device 205 of a receiver side measuring apparatus 200A, and a time difference between the identified frame and the cycle timing of 1 pps signal obtained from the GPS receiver 201 is measured. Thereafter, the device 205 determines a differential between the measured time difference and a known time difference, thereby finding the delay time of the OFDM signal.
Sadao Muramatsu
Atsushi Tsuboi
Ryo Hashimoto
Satoshi Kono
Makoto Nakamura
Shoji Kawai