Method and system for transmission and reception of high definition

A system for transmission and reception of high definition television signals, comprising:

• means for deriving, for images of a scene to be transmitted, a first television signal and a second television signal, said second television signal containing an enhancement signal which, when combined with said first television signal, can produce a high definition television signal representative of said images;
• means for generating a code signal representative of a second transmission frequency channel over which said second television signal is to be transmitted;
• means for combining said code signal into said first television signal;
• means for transmitting said first television signal over a first transmission frequency channel and for transmitting said second television signal over said second transmission frequency channel;
• and
• receiver means, including:
• a first tuner, for receiving said first television signal, means for recovering said code signal from the received first television signal;
• a second tuner which is electronically controllable;
• means for applying a signal derived from the recovered code signal to said second tuner to tune said second tuner to said second transmission frequency channel so as to receive said second television signal;
• and means for combining the received first and second television signals to obtain a high definition television signal representative of said images.

For use in a system for transmitting and receiving high definition television signals representative of images of a scene, said system including a transmitter and a receiver, said transmitter including means for deriving first and second television signals representative of said images;

• means for generating a code signal representative of a transmission frequency channel over which said second television signal is to be transmitted;
• means for combining said code signal with said first television signal;
• and means for transmitting said first television signal over a first transmission frequency channel and for transmitting said second television signal over said second transmission frequency channel, said second transmission frequency channel being not adjacent to said first transmission frequency channel;
• a receiver which comprises:
• first and second tuning means, said first tuning means being controllable to obtain said first television signal transmitted over said first transmission frequency channel;
• means responsive to said first television signal for recovering said code signal from said first television signal;
• means for automatically controlling said second tuning means in accordance with the recovered code signal to tune said second tuning means to obtain said second television signal transmitted over said second transmission frequency channel;
• and
• means for producing a high definition television signal representative of said images by combining the received first and second television signals.

For use in a system for transmitting and receiving high definition television signals representative of images of a scene, the system including a transmitter and a receiver, a transmitter for said system comprising:

• means for deriving first and second television signals representative of said images;
• means for generating a code signal representative of a transmission frequency channel over which said second television is to be transmitted;
• means for combining said code signal with said first television signal;
• and
• means for transmitting said first television signal over a first transmission frequency channel and for transmitting said second television signal over a second transmission frequency channel as is represented by said code signal, said second transmission frequency channel being not adjacent to said first transmission frequency channel;
• whereby when said first television signal is received at a receiver, said code signal can be recovered therefrom and utilized to automatically tune a tuner to receive said second television signal, said second television signal to be used for enhancing said first television signal to obtain a high definition television signal representative of said images.