Detection arrangement for detection of signal variations in a si

Details Detection arrangement for detection of signal variations in a si Detection arrangement for detection of signal variations in a si

1988-04-19

1989-09-12

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307359, 328151, H03K 524

Patent

active

048663000

ABSTRACT:
A detection arrangement (1) for detecting variations in a signal has an input (5) to which is supplied a signal that is processed into a reference signal by a signal processing device (2) comprising a threshold circuit (3) followed by a signal hold circuit (6). The reference signal is formed at an output (12) of the signal hold circuit (6). The signal supplied to the input (5) of the detection arrangement and the reference signal formed at the output (12) of the signal hold circuit are supplied to a comparison circuit (9). The signal processing device ensures that the reference signal formed at the output of the signal hold circuit follows peaks and valleys of the signal except for a difference value, the reference signal assuming a threshold value when a peak or a valley is reached. If the signal varies within a range determined by the difference value around the threshold value, the signal hold circuit holds the threshold value. As a result noise influences are eliminated upon detection of peaks and valleys in the signals. The signal processing device comprises means for adjusting the difference value so that it is possible to adapt the apparatus to various signal-to-noise conditions.

REFERENCES:
patent: 3708678 (1973-10-01), Kreda
patent: 3804979 (1974-04-01), Knowles
patent: 4175256 (1979-11-01), Dolikian
patent: 4213023 (1980-07-01), Satoh et al.
patent: 4375037 (1983-02-01), Ikushima
patent: 4635142 (1987-01-01), Haugland

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