Television – Basic receiver with additional function – Multimode
Patent
1995-07-07
1997-08-26
Peng, John K.
Television
Basic receiver with additional function
Multimode
348554, H04N 546
Patent
active
056615272
ABSTRACT:
An automatic video signal identification system uses zero-mean normalized reference signals that are cross-correlated with an input video signal. The input video signal is stored in an acquisition memory and then cross-correlated with a plurality of reference signal templates, each template representing a particular video signal to be identified. The cross-correlation process provides a corresponding plurality of maximum correlation outputs. The largest maximum correlation output is determined, and the corresponding template identified. If not already normalized, the largest maximum correlation .output is normalized to produce a correlation coefficient. Based upon the identified template the correlation coefficient is tested to determine the validity of the match, i.e., whether the video signal is identified or whether the video signal is unknown. The resulting match ID is then converted into a code which is used to steer video signal measurements for the identified video signal and/or into a text label for display. The reference signal templates may be preloaded or captured from the input signal, making the system adaptable for identifying additional video signals.
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"Modern Digital and Analog Communication Systems" Second Edition B.P. Lathi, California State University, Sacramento, Holt, Rinehart and Winston, Inc.
Gray Francis I.
Murrell Jeffrey S.
Peng John K.
Tektronix Inc.
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