Patent ID: 6085066
Filing Date: 2000-07-04
Classification: H04H,H04N

Abstract:
A method for determining the channel to which a television is tuned, comprising the steps of:(a) receiving a television signal receivable by a television and demodulating said television signal to obtain a first audio signal;(b) obtaining a second audio signal representative of sound generated by said television as a result of being tuned to one of a prescribed set of channels; and(c) generating a match signal on the basis of said first and second audio signals, said match signal indicating whether said first and second audio signals are from the same television channel;wherein said match signal is generated by an audio transformer; and wherein said first audio signal is fed to one of a primary winding or secondary winding of said transformer, said second audio signal is fed to the other of said primary winding or secondary winding, and said match signal is provided on a center tap of said primary winding.