| 摘要 |
A decoding system for PAL television signals. One line of chrominance information is applied to synchronous demodulators and, by means of a switching circuit and delay means, the same line, delayed one line interval, is again applied to the same demodulators. The reference sub-carrier generating means to be controlled by synchronizing color bursts is switched to be controlled, on alternate lines, first by direct burst signals and then by inverted burst signals so that the phase of the reference sub-carrier signal will be between the phases of the controlling signals and will reverse polarity between lines. The phase of the reference sub-carrier signal may be adjustable for hue control. |
