The experimental results of measures for common amplification of data and FM-TV carried within the FM-TV band in the communication satellite transponder are described. The results show that the good transmission quality of FM-TV is obtained but C/N and BER degradation of data due to the small signal suppression effect and transfer noise from FM-TV, are observed. Data, however, from HUB to VSAT with appropriate link parameter, as well as from VSAT to HUB, has acceptable quality, which suggests promising feasibility for the economical one way or two way data communication within the satellite TV broadcasting.
This paper presents an experimental study of a noise reduction scheme for a Vertical-Temporal (VT) helper signal transmitted on top and bottom bars of letter-box EDTV. In this scheme, SSKF (Symmetric Short Kernel Filter) is used to generate transmitted signals and reduce the noise at EDTV receivers. Subjective assessment tests clarify the noise reduction effect.
This paper proposes a motion-adaptive LD (Line Difference)/FD (Frame Difference) hybrid signal for a VT (Vertical-Temporal) helper signal on EDTV. In this method, the FD signal is used in stationary areas and the LD in moving areas. The signal is little visible on current receivers. Transmission noise can be reduced on EDTV receivers by coring and non-linear amplitude companding techniques. The receivers can be implemented by adding only a little circuits to Clear-Vision receivers.
In this paper, first, intra-field letterbox processing is optimized with respect to perfect reconstruction for wide-aspect receiver. Then, letterbox decoding of interlaced-scan system and Progressive-scan system are unified by decomposing them into basic processes. And finally, weighted noise power of some typical systems are caluculated. These results are considered to be usefull for EDTV-II in Japan.