Patent ID: 6219095
Filing Date: 2001-04-17
Classification: H04N

Abstract:
A method of determining noise in a CATV channel, the CATV channel comprising a predetermined frequency band, the CATV channel being in-service when a transmitted carrier signal having a frequency in the predetermined frequency band is present, the method comprising:a) obtaining a television signal corresponding to a predetermined CATV channel, the television channel comprising a carrier signal modulated by an information signal;b) sampling at least a part of the television signal to produce a digital signal segment, said digital signal segment comprising a carrier component, a noise signal component, and an information signal component, wherein said information signal component has a substantially predetermined signal pattern;c) employing digital signal processing to separate the carrier component from the digital signal segment to produce a baseband signal comprising substantially the information signal component and the noise signal component; andd) obtaining an estimate of the information signal and subtracting the estimate from the baseband signal, thereby producing a noise signal estimate.