Patent ID: 6535717
Filing Date: 2003-03-18
Classification: H04H,H04L,H04N

Abstract:
A method of transmitting a signal from a transmitting side and receiving and reproducing the transmitted signal on a receiving side in a digital broadcasting situation, the method carried out in such a manner that:on the transmitting side, a high quality signal is created based on broadcast digital data and at least one low quality signal is created based on the same broadcast digital data, the low quality signal being created by reducing an information data amount of the high quality signal, so that the quality of the low quality signal is low with respect to that of the high quality signal, and the high-quality signal and the low quality signal are transmitted so that one of the signals has a time lag relative to the other, the high quality signal is transmitted by using a first channel band while the low quality signal is transmitted by using a second channel band of which width is narrower than that of the first channel band, the low quality signal being transmitted before the high quality signal is transmitted from the transmitting side, and on the receiving side, the receiving side including mode determining means for determining which of a normal receiving mode and a broadcast hindrance mode is effected, and reproducing means for reproducing the high quality signal when the normal receiving mode is effected while reproducing the low quality signal when the broadcast hindrance mode is effected, the reproducing means reproduces the high quality signal when the mode determining means determines a normal receiving mode is effected while the reproducing means reproduces the low quality signal when the mode determining means determines the broadcast hindrance mode is effected.