Patent ID: 7350225
Filing Date: 2008-03-25
Classification: H04N

Abstract:
1. A method comprising: eliminating one or more channels associated with at least one of analog media content and non-digital signal sources from a search for data channels, the one or more channels part of a plurality of multimedia channels in a cable network; tuning a receiver of a broadband cable signal associated with a quadrature amplitude modulation (QAM) technique to a selected channel within the broadband cable signal; temporarily activating adaptive equalizer logic in a QAM demodulator from operation using the CAM technique to demodulate the selected channel according to a quadrature phase shift keying (QPSK) modulation technique to position a slicer in the QAM demodulator to an appropriate quadrant in an in-phase/quadrature (I/Q) constellation; sweeping a carrier frequency of the receiver over a carrier loop bandwidth for the receiver to attempt to obtain a channel lock on the selected channel while the receiver is activated in order to demodulate the selected channel according to the QPSK modulation technique; if a channel lock is obtained and the selected channel is a data channel, activating the adaptive equalizer logic in the QAM demodulator to demodulate the selected channel according to the QPSK technique.