Title:
TIME BASE CORRECTOR
Document Type and Number:
Japanese Patent JPS6393286
Kind Code:
A
Abstract:
PURPOSE:To sufficiently correct the fluctuation of time base due to external disturbance by inserting a frequency characteristic correcting circuit strengthening a band corresponding to the frequency component of any disturbance into a circuit system controlling a variable delay circuit. CONSTITUTION:A signal outputted from a compensation circuit 8 is supplied to a 250 Hz tuning circuit 9, for instance, in which said signal functions as a frequency characteristic correcting circuit. A switch 10 selects a signal outputted from the tuning circuit 9 and a signal bypassed through said circuit 9, and the selected signals are supplied to a VCO 12 through an amplifier 11. A signal from the amplifier 11 is supplied to a bypass filter 13, which removes components less than 100 Hz in order to remove eccentric components. A signal outputted from the filter 13 is supplied to a level detection circuit 14. When the output signal of the filter 13 exceeds a prescribed level, the switch 10 is changed over to the side of the bypass. Thus the fluctuation of time base, which is caused by the external disturbance made of prescribed frequency components, can be sufficiently corrected. The disturbance includes axial resonance, etc.
Inventors:
OTSUKA TORU
TERAJIMA MASAYUKI
TERAJIMA MASAYUKI
Application Number:
JP23849186A
Publication Date:
April 23, 1988
Filing Date:
October 07, 1986
Export Citation:
Assignee:
SONY CORP
International Classes:
G11B20/02; H04N5/95; H04N5/953; (IPC1-7): G11B20/02; H04N5/95
Attorney, Agent or Firm:
Sada Ito (1 person outside)
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