Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1984-11-30
1987-01-06
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
328117, 328164, H03K 501, H03K 5153, G01R 2902
Patent
active
046348964
ABSTRACT:
A circuit and method for qualifying valid data peaks within a raw readout signal. The raw readout signal is of the type generated when data is retrieved from magnetic storage devices. The raw readout signal is processed through four parallel channels. A first channel includes follow and hold circuitry that follows the signal level of the raw readout signal if the signal level is increasing, and holds the highest previously encountered signal level when the raw readout signal level is decreasing. The follow and hold circuitry also detects the occurrence of a prescribed polarity slope within the raw readout signal, providing the amplitude of the raw readout signal at the point where the slope is detected exceeds the value held in the follow and hold circuitry. The net effect of the first channel is thus to detect signal slopes leading to increasingly higher amplitude data peaks within a given positive or negative region of the raw readout signal, and to not detect slopes leading to data peaks of lesser amplitude than previous peaks. A second channel includes peak detection circuitry for detecting all peaks that occur within the raw readout signal. A third channel includes threshold detection circuitry for detecting when the raw readout signal exceeds a prescribed threshold. A fourth channel determines the polarity--positive or negative--of the raw readout signal. A data peak is initially qualified only if the first three channels indicate a concurrence of: (1) a prescribed slope, (2) a peak, and (3) an above-threshold condition. Data peaks for a given polarity region of the raw readout signal--which polarity region is defined by the polarity detection of the fourth channel--are finally qualified by eliminating all but the last of a series of initially qualified peaks.
REFERENCES:
patent: 3437833 (1969-04-01), Razaitis et al.
patent: 3631263 (1971-12-01), Graham et al.
patent: 4429404 (1984-01-01), Mai
Storage Technology Corporation
Zazworsky John
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