Television – Synchronization – Control of picture position
Patent
1992-07-09
1994-09-13
Powell, Mark R.
Television
Synchronization
Control of picture position
H04N 504
Patent
active
053473175
ABSTRACT:
The present invention relates to a horizontal oscillation circuit for generating horizontal drive pulses to be used for a cathode-ray tube. A microcomputer measures the frequency or the period of an input horizontal synchronizing signal, takes out a target value corresponding to the measured frequency or the period from an EEPROM, and gives a set value corresponding to the target value to a first D-A converter. The microcomputer also gives a set value corresponding to 1/2 of a period of the input horizontal signal to a second D-A converter. A first monostable multivibrator outputs a pulse signal having pulse widths corresponding to the output voltage of the first D-A converter. A second monostable multivibrator outputs a horizontal drive pulse signal having pulse widths corresponding to the output voltage of the second D-A converter. Furthermore, the microcomputer compares the output pulse width of the first monostable multivibrator output from a first counter with a latch with a target value, and gives a set value to the first D-A converter to make the output pulse width of the first monostable multivibrator approach the target value. The microcomputer also compares the output pulse width of the second monostable multivibrator output from the second counter with a latch with 1/2 of a period of the input horizontal signal and gives a set value to the second D-A converter to make the output pulse width of the second monostable multivibrator approach 1/2 of a period of the input horizontal signal.
REFERENCES:
patent: 5138283 (1992-08-01), Tanizoe
patent: 5235422 (1993-08-01), Ido et al.
Patent Abstracts of Japan, vol. 14, No. 16, E-872, Jan. 12, 1990.
Patent Abstracts of Japan, vol. 14, No. 194, E-919, Apr. 20, 1990.
Mitsubishi Denki & Kabushiki Kaisha
Powell Mark R.
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