Transmitter and receiver for a multicarrier digital signal reducing co-channel interference with an analog television signal

摘要

The transmitter has a digital signal shaping unit acting such that intercarrier frequency spacing (deltaf) is a sub-multiple of line frequency (fl) of a predetermined analog TV signal. A transmission unit transmits a sub-carrier at a frequency equal to the summation of a main video carrier of the analog TV signal and a product of integer and the line frequency, so that a subset of sub-carriers e.g. coincidence subset, coincides with analog video lines. The transmission unit transmits the sub-carriers of coincidence sub-assembly with power less than power allocated to other sub-carriers. An independent claim is also included for a receiver for receiving a multicarrier digital signal.