Title:
LOOP GAIN CONTROL DEVICE
Document Type and Number:
Japanese Patent JPS6479803
Kind Code:
A
Abstract:
PURPOSE:To fix loop gain without deteriorating the leading-in characteristics of system by detecting a resonance value level of a loop characteristic, comparing a detecting signal with a reference voltage and then controlling a voltage control amplifier arranged in a loop through a limiter circuit. CONSTITUTION:Since no peak exists in a loop immediately before the start of control or at the time of generating tracking-out, the output of a voltage comparator 7 is oscillated up to the maximum driving capacity of a circuit, so that the voltage control amplifier VCA 8 can be set up to the maximum gain. Since the loop is turned to an unstable state and the loop can not be easily led in at the time of starting the control or at the time of releading, the VCA 8 is restricted to a control voltage for the VCA 8 whose gain can be reled by a limiter circuit 12. Even when the tracking loop is set up to any state, the releading can be stabilized and the loop gain can be also stabilized.
Inventors:
OGAWA NOBUYUKI
ABE MASAYOSHI
ABE MASAYOSHI
Application Number:
JP23780687A
Publication Date:
March 24, 1989
Filing Date:
September 22, 1987
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G11B21/10; G05B11/36; (IPC1-7): G05B11/36; G11B21/10
Domestic Patent References:
| JPS5952314A | 1984-03-26 | |||
| JPS6191702A | 1986-05-09 | |||
| JPS61233431A | 1986-10-17 | |||
| JPS5764128A | 1982-04-19 |
Attorney, Agent or Firm:
Tomoyuki Takimoto