Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1991-07-02
1992-06-30
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
358158, G09G 104, H01J 2970, H03L 700
Patent
active
051266393
ABSTRACT:
An adaptive oscillator control system includes a phase locked loop together with a static phase error correction system and external scan system components. An oscillator range control includes a processor having a plurality of established oscillator frequency ranges which are identified by oscillator range code numbers. A first frequency approximation is provided based upon either an oscillator range code number or a known standard scan frequency. A frequency detector provides a second frequency approximation and a confidence circuit examines oscillator consistency and enables the phase locked loop. Thereafter, a lock detector responds to the occurence of frequency and phase lock by the phase lock loop to enable the static phase error corrector and deactivate the oscillator range control system. The lock detector upon detecting horizontal synchronization, for broadcast type video, increases the second frequency approximation range. The system changes oscillator frequency and tuning and adjusts external sweep components such as phase locked loop filter, horizontal yoke tuning, and drive signal applied to the horizontal output amplifier after lock.
REFERENCES:
patent: 4922343 (1990-05-01), Ando
patent: 5021719 (1991-06-01), Arai et al.
Issing Gregory C.
Zenith Electronics Corporation
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