| 摘要 |
<p>Reference signals are introduced, consisting of several oscillations of the subcarrier frequency, with a phase with repeats itself in alternate lines and coincide with the bisection of the angle defined by modulation axes. It comprises synchronous demodulators with colour signal and subcarrier inputs. Generators provide a continuous oscillation from the reference signals, for application to the demodulator subcarrier inputs. A delay line for the colour signal delays by a time interval equal to an odd number of lines. Adders combine colour signals which have passed through the delay line with non-delayed colour signals, allocated to two consecutive lines and separated by an even number of lines, so that phase error is compensated.</p> |
