Method of and circuitry for automatically adjusting the variable

Details Method of and circuitry for automatically adjusting the variable Method of and circuitry for automatically adjusting the variable

1987-10-21

1989-05-02

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Frequency- or phase-modulated systems

388910, 388933, 388917, 388902, 388934, G05B 102

Patent

active

048272027

ABSTRACT:
In a control loop for automatically adjusting variable-gain amplification, a sinusoidal signal with a frequency f.sub.o that is critical for the control loop is superimposed over a positioning parameter W. Two synchronous rectifiers S1 and S2 filter out the oscillation components of a control parameter x and of a control difference x.sub.d that contain frequency f.sub.o, and the components are compared in a comparator VL. A control and regulating circuit C continues to vary the variable-gain amplification at controls RG until the amplitudes of the oscillation components being compared in the comparator are equal. The variable-gain amplification is correct at that point. The variable-gain amplification can even be adjusted in a compact-disk player while the player is in operation.

REFERENCES:
patent: 3395322 (1968-12-01), Peterssen et al.
patent: 3548282 (1969-01-01), Schiller
patent: 4158163 (1979-06-01), Eriksen et al.
patent: 4302666 (1981-11-01), Hawkins
patent: 4310791 (1982-01-01), Akamatsu
patent: 4331263 (1982-05-01), Brown
patent: 4475631 (1984-10-01), Nomura

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