Electricity: motive power systems – Positional servo systems – Frequency- or phase-modulated systems
Patent
1987-03-09
1988-03-29
Dobeck, Benjamin
Electricity: motive power systems
Positional servo systems
Frequency- or phase-modulated systems
318314, 318341, 318636, 318599, 307511, H02P 700
Patent
active
047346302
ABSTRACT:
Method and system for phase comparison which uses a ramp-form signal generated from a reference frequency signal and a sampling pulse train signal synchronized with an input signal whose phase change is to be detected. The reference frequency signal, through a dividing circuit is normally utilized for generating the ramp-form signal while a shift pulse signal is generated when a phase of the sampling pulse train signal is deviated outside a predetermined section of each ramp portion of the ramp-form signal, and utilized for generating the ramp-form signal. By this feature, sampling times of the ramp-form signal are always maintained within the predetermined section of each ramp portion of the ramp-form signal even if a frequency of the input signal deviates very widely from the frequency of the reference frequency signal.
REFERENCES:
patent: 3487458 (1969-12-01), Martens et al.
patent: 4378519 (1983-03-01), Du Vall
patent: 4511830 (1985-04-01), Yamada
patent: 4562394 (1985-12-01), Itoh
patent: 4572995 (1986-02-01), Enami
patent: 4613799 (1986-09-01), Sumi
Dobeck Benjamin
Pioneer Electronic Corporation
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