Multiplexed signal receiving apparatus

A multiplexed signal receiving apparatus for receiving a transmitted multiplexed signal obtained by converting a first image signal for a screen wider than a screen obtained by an existing television signal to a signal which can be reproduced by a receiver of an existing television system, and for decoding the received multiplexed signal, comprising:

• dividing means for receiving the multiplexed signal and dividing the multiplexed signal to a center portion signal and upper and lower black bar portion signals of the screen,
• the multiplexed signal being converted such that a compressed second image signal has a center portion as an image display portion and upper and lower black bar portions as non-image portions when a vertical high-frequency component of the first image signal is band-limited along the temporal spatial frequency by a transmission side to obtain a second image signal, the second image signal is compressed in the vertical direction, and the compressed second image signal is matched to the screen of the receiver of the existing television system,
• the upper and lower black bar portions being multiplexed with a difference signal (first LD signal) as a difference between an interpolated scanning line, obtained by performing interpolation by using a plurality of vertical interlace scanning lines of the second image signal, and a scanning line actually constituting the second image signal and corresponding to the interpolated scanning line,
• first compensation signal reproducing means for reproducing the first LD signal from the upper and lower black bar portion signals obtained by said dividing means;
• double speed converting means for double-speed converting the center portion signal obtained by said dividing means;
• converting means for alternately selecting a direct scanning line output from said double speed converting means and a line-interpolated scanning line formed by using the direct scanning line and outputting a progressive scanning signal;
• expanding means for expanding a signal obtained by said converting means in the vertical direction by an amount corresponding to that compressed on the transmission side, thereby obtaining an expanded signal;
• first compensation signal synthesizing means for adding the first LD signal reproduced by said first compensation signal reproducing means to the interpolated scanning line of a first field used by said converting means;
• second compensation signal reproducing means for generating a second LD signal from the progressive scanning signal compensated for by said first compensation signal synthesizing means in the same manner as on the transmission side;
• and
• second compensation signal synthesizing means for adding the second LD signal to the interpolated scanning line of a second field used by said converting means.