Title:
POSITION SIGNAL ADJUSTING DEVICE
Document Type and Number:
Japanese Patent JPS63113985
Kind Code:
A
Abstract:
PURPOSE:To eliminate an adjusting work and to maintain a stable action by automatically adjusting a servo type circuit with fine adjusting information generated based on a special position signal. CONSTITUTION:Servo data, which comes to be a certain constant output signal by an AGC (automatic gain) AMP4, are sample-held by a sample holding circuit 5 and the information to show the peak value of 4 signals is supplied to a position signal generating circuit 6 and a servo AGC generating circuit 7. The circuit 6 outputs four types of a position signal P based on the information outputted from the circuit 5. A position signal output comparator 8 obtains the difference in the position signal to show the maximum in respective positive and negative directions out of the signal P. The information of the output difference is received by a microprocessor 9, a signal, which comes to be larger when the output difference is small and a signal, which comes to be smaller when the output difference is large, are sent to a voltage generating circuit 73 for adjustment in the circuit 7 and an AGC voltage is adjusted. Thus, the adjusting work of the AGC voltage can be eliminated.
Inventors:
KARITA HIROYUKI
KITAJIMA MIYUKI
KITAJIMA MIYUKI
Application Number:
JP25971086A
Publication Date:
May 18, 1988
Filing Date:
October 31, 1986
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
G11B21/10; G05D3/12; (IPC1-7): G05D3/12; G11B21/10
Attorney, Agent or Firm:
Takehiko Suzue