COMPUTER HARDWARE AND SOFTWARE FOR USE IN THE TELECOMMUNICATIONS FIELD, NAMELY, COMPUTER HARDWARE AND SOFTWARE FOR IMPROVING THE CAPACITY AND/OR SERVICE QUALITY OF BROADBAND AND CABLE BY REDUCING NOISE LEVEL AND UNWANTED SIGNALS IN THE CABLE NETWORK RETURN PATH, AND COMPUTER HARDWARE AND SOFTWARE FOR MONITORING THE CABLE NETWORK RETURN PATH FOR UNWANTED SIGNALS; NOISE MEASUREMENT AND NOISE REDUCTION APPARATUS FOR USE IN CONNECTION WITH CABLE TV NETWORKS, NAMELY, UNITS INSTALLED AT STRATEGIC L...