Title:
AUTOMATIC SWITCHING CIRCUIT DEVICE FOR REGULATING SPEED OF PHASE CONTROL CIRCUIT
Document Type and Number:
Japanese Patent JPS6457881
Kind Code:
A
Abstract:
PURPOSE: To satisfactorily reproduce a television transmission signal and a recording signal by providing a control circuit by which adjusting speed is accelerated during the image flyback period of electronic beam of a picture tube and the adjusted speed is decelerated during the image scanning period. CONSTITUTION: A synchronizing signal and an oscillator signal are supplied to the input sides of an AND gate 9 and a NOR gate circuit 10 having an inverting input side, and required control voltages for contacts 6 and 7 are generated on control lines 4 and 5. Current sources 1 and 2 charge and discharge a capacitor 8, and a regulated voltage for adjusting an oscillator 3 is generated at the capacitor 8. Concerning a regulated current, the adjusting speed is accelerated by a control circuit 12 during the image flyback period of electronic beam of the picture tube and the adjusted speed is decelerated during the image scanning period. Thus, phase control is speedily performed in the time area to speedily perform it and the phase control is slowly performed in the time area where low control speed is meaningful.
Inventors:
FURANTSU DEIITAARE
UDO MAI
UBUE HARUTOMAN
UDO MAI
UBUE HARUTOMAN
Application Number:
JP12405288A
Publication Date:
March 06, 1989
Filing Date:
May 23, 1988
Export Citation:
Assignee:
THOMSON BRANDT GMBH
International Classes:
H04N5/05; H04N5/12; H04N3/16; (IPC1-7): H04N3/16; H04N5/12
Domestic Patent References:
| JPS6126267A | 1986-02-05 | |||
| JPS5624882A | 1981-03-10 |
Attorney, Agent or Firm:
Toshio Yano (1 outside)