A television signal processing apparatus is capable of generating a television signal which is compatible with a television signal of aspect ratio of 4:3 and possesses an aspect ratio greater than 4:3. At the transmission side, a video signal having a greater aspect ratio than 4:3 is converted into a first signal which settles within an image frame determined in a standard, and a second signal is disposed in other area than the image frame. An offset is applied to a pedestal in a horizontal blanking interval in an other area than the image frame, and a set-up is applied to the pedestal in an effective scanning period in the other area than the image frame. At the reception side, the offset and set-up of the pedestal in the multiplexed portion of the second signal are removed from a received signal, and a circuit for restoring the second signal is provided. When the generated television signal is received by an existing television receiver, the second signal is not annoying, and in a special-purpose receiver, a high resolution image of aspect ratio of 16:9 less in noise deterioration of the second signal can be received.