Dual diplexer combining device and television broadcast transmission system using same
AssigneeThomcast Communications, Inc.
InventorMark Aitken
Life of this patent
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Abstract
A method and apparatus are provided for allowing two different television signals to be combined and sent to a common propagation device, such as a tower antenna. The apparatus utilizes a number of appropriately loaded hybrids, hybrid waveguide junctions, or other appropriate equivalent devices to combine the signals in such manner that there is a minimum of intersignal interference or distortion. The apparatus utilizes bandpass/reject filters and notch filters in conjunction with the hybrids to achieve the desired results. A television broadcast system using the hybrid combining apparatus is also provided.
Claims18
Apparatus for combining first and second television signals for propagation on a common propagating device, comprising:
- a first hybrid which receives said first television signal at a first port thereof, divides said first television signal into two divided signals and outputs the divided first television signals at second and third ports thereof;
- a second hybrid which receives said divided first television signals at first and second ports thereof, receives a first component of said second television signal at a third port thereof, recombines said divided first television signals into a single signal and outputs a combination of said first television signal and said first component of said second television signal at a fourth port thereof;
- a third hybrid which receives said combination at a first port thereof, divides said combination into two divided combination signals and outputs the divided combination signals at second and third ports thereof;
- and
- a fourth hybrid which receives said divided combination signals at first and second ports thereof, receives a second component of said second television signal at a third port thereof, recombines said divided combination signals into a single combination signal and outputs a combination of said single combination signal and said second component of said second television signal at a fourth port thereof.
A method for combining a first television signal with a second television signal for transmission to a common propagating device, comprising the steps of:
- inputting said first television signal into a first hybrid;
- outputting said first television signal from said first hybrid into a second hybrid where it is combined with a first component of said second television signal and outputted as a first combined signal;
- inputting the first combined signal into a third hybrid;
- outputting the first combined signal from said third hybrid into a fourth hybrid where it is combined with a second component of said second television signal and outputted as a second combined signal to said common propagating device.
A television broadcast system, comprising:
- a first transmitter for developing a first television signal;
- a second transmitter for developing first and second components of a second television signal;
- a dual hybrid combining device for combining said first television signal with said first component to provide a first combined signal, combining said first combined signal with said second component to provide a second combined signal, and outputting said second combined signal;
- and
- a common propagation device for receiving said second combined signal and propagating said second combined signal through the atmosphere.
Dependencies are inferred from the claim text.