CATV upstream signal transmission at nonharmonic video frequenci

Details CATV upstream signal transmission at nonharmonic video frequenci CATV upstream signal transmission at nonharmonic video frequenci

1983-12-09

1986-04-29

George, Keith E.

Facsimile and static presentation processing

Static presentation processing

Attribute control

455 5, H04N 710, H04N 714

Patent

active

045860785

ABSTRACT:
In a cable television (CATV) system improved upstream data communication is provided by the use of preferred frequencies. Harmonics of downstream video and audio carrier signals arising from cable discontinuities produce common mode nonlinear distortion. Cable discontinuities caused by a loose, defective or corroded connector operate as a downstream mixing diode. The cross- and intermodulation products thus produced are avoided in the present invention by the use of upstream frequencies displaced from these harmonics. In a preferred embodiment, two harmonically-related upstream carriers generated by a single signal source and centered between adjacent harmonic noise peaks provide reliable upstream data channels in a two-way CATV system. In another arrangement, each subscriber terminal transmits upstream in an alternating manner, first at one frequency and then at a second frequency, until an acknowledge signal is received from the CATV headend.

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patent: 4509073 (1985-04-01), Baran et al.
patent: 4520508 (1985-05-01), Reichert, Jr.

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