| 摘要 |
1,113,640. Video playback. AMPEX CORPORATION. 27 Jan., 1966 [12 March 1965], No. 3764/66. Heading G5R. In an arrangement for automatically equalizing colour television signals played back from a tape 18 by a number of rotating transducers 12-15, the sync. and burst pulses associated with the television signals are used as reference signals, relative to which the equalizer operation is adjusted. The played back signals are passed through equalizers 32-35 and thence via a head switching arrangement 38 to a demodulator 40. After demodulation the near edges of the sync. signals are detected by a sync. stripper and used to open a burst gate 60 to pass the following fixed frequency burst. These signals are passed via gates which are opened in synchronism with those in the switcher 38 and are compared with standard references in the comparators 90-96. The comparator outputs are used to control the equalizers 32-35, so that each television information signal is automatically equalized. The gates in the switcher 38 and in the units 72-78 are controlled by a generator 42 operated by a strobing arrangement associated with the rotating transducer system. |
