System for delivering digital sound, graphics, real time files and data via cable

DETAILED DESCRIPTION Cable television systems in the United States typically utilize coaxial cable which require the use of signal amplifiers capable of carrying a bandwidth of approximately 300 MHz of information which is sufficient to carry the information for approximately 50 television channels.
Efforts are underway to substitute optical fiber to reduce the number of signal amplifiers to achieve a bandwidth of 1 gigahertz for a cable television system.
This increased bandwidth is capable of carrying approximately 150 television channels.
However, since it is highly unlikely that any community would have the need for 150 separate channels, it would be advantageous to use, for example, only half of the available bandwidth for television channels, which would still allow for 75 channels, and use the remaining 1/2 gigahertz of bandwidth for digital data.
In this connection, the invention is directed to a method and apparatus for sending digital audio data and/or digital graphics within the aforesaid 1/2 gigahertz of available bandwidth, specifically, the upper 1/2 gigahertz of available bandwidth.
It should be noted however that the invention is not limited to the use of the upper 1/2 gigahertz of available bandwidth, but makes it possible for digital audio and graphics to be sent over any regular television channel on any cable system.
The system could even be used on a television signal broadcast at a normal broadcast frequency if the signal received in the home is of high enough quality.