H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/24
H04N 7/173 (2006.01)
Patent
CA 1212456
Abstract of the Disclosure 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.
461097
Citta Richard W.
Mutzabaugh Dennis M.
Sgrignoli Gary J.
Macrae & Co.
Zenith Electronics Corporation
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