Rate-of-change signal generator using sampling techniques

Details Rate-of-change signal generator using sampling techniques Rate-of-change signal generator using sampling techniques

1986-04-28

1987-12-22

Dobeck, Benjamin

Electricity: motive power systems

Positional servo systems

'sampling' systems including miscellaneous 'sampled data'...

318616, 364732, 333 19, G05B 2102

Patent

active

047148667

ABSTRACT:
There is disclosed herein an apparatus and method for generating a first signal related to the rate of change of a second signal. In particular, a system is disclosed for generating a velocity signal in a sampled data servo system. The apparatus uses three track and hold amplifiers one of which is also a difference amplifier to sample the position error signal at selected times. A "present" track and hold amplifier samples and holds the position error signal during the current frame. After this is done, during the same frame, a "summing" track and hold amplifier having its difference inputs coupled to the outputs of the "present" track and hold amplifier and to a "previous" track and hold amplifier samples the difference between the present position error signal and the value of the position error signal during the previous sample frame. This difference divided by the sample period gives the velocity. After the difference value is sampled, the "previous" track and hold amplifier sample is updated to the amplitude of the position error signal during the current frame in preparation for the calculation during the next frame.

REFERENCES:
patent: 4266168 (1981-05-01), Anderson
patent: 4366422 (1982-12-01), Rhodes
patent: 4379256 (1983-04-01), Maury
patent: 4402022 (1983-08-01), Hirota
patent: 4451860 (1984-05-01), Honjo
patent: 4617502 (1986-10-01), Sakave

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