H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 17/00 (2006.01) H04N 5/21 (2006.01)
Patent
CA 2061852
ABSTRACT OF THE DISCLOSURE A system for detecting a transmission path response for television signals comprising a signal originating equipment and a receiving apparatus wherein the signal originating equipment includes a reference signal generator for generating a quasi noise data series, a polarity reversing circuit for reversing the polarity of the quasi noise data series and a composing arrangement for composing the quasi noise data series and the polarity reversed quasi noise data series reversed by the polarity reversing means on two predetermined horizontal lines of a television signal at a prescribed period so as to transmit the composite television signal, and the receiving apparatus includes a receiving circuit for receiving a television signal which is composed with a quasi noise data series and a polarity reversed quasi noise data series at a prescribed period and transmitted via a prescribed transmission path, a local reference signal generator for generating a local reference signal having a data series corresponding to the quasi noise data series composed in the television signal, a polarity reversing circuit for reversing the polarity of the local reference signal at a period corresponding to the reversed polarity period of the quasi noise data series, a convolution operating circuit for performing a convoluting operation on both the quasi noise data series from the receiving circuit - 55 - and the local reference signal from the polarity reversing circuit, and a inter-field adding circuit for adding the correlation signals output from the convolution operating circuit before and after the reversed polarity period of the quasi noise data series together so as to detect a transmission characteristic of the transmission path. - 56 -
Goudreau Gage Dubuc
Iga Hiroyuki
Kabushiki Kaisha Toshiba
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