Electronic circuit device for anaysis of a digital signal from a

Details Electronic circuit device for anaysis of a digital signal from a Electronic circuit device for anaysis of a digital signal from a

1995-05-26

1997-11-04

Miska, Vit W.

Horology: time measuring systems or devices

Combined with disparate device

368113, 123416, 123478, G04B 4700, F02P 500

Patent

active

056847572

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to an electronic counter circuit for time-domain measurement of a digital signal of any periodic signal waveform, the digital signal comprising a series of periodic events in groups, and more particularly, to an electronic circuit for analyzing a digital signal from a rotational position detector.
It is known for electronic counter circuits to be used in many areas of technology. These circuits are used for quantitative detection of a continually repeating process. The counting function is in this case initiated by applying a counting signal at an event-dependent clock frequency to the input of a counter which belongs to the counter circuit, and counts at an event-independent counting frequency. If event assessment is intended to be carried out, a gate logic device is connected upstream, by means of which individual clock pulses can be deliberately masked out. This results in the counter counting correspondingly slower, and event-dependent appraisal of the count thus being possible.
In the case of measurement of a time duration of a signal, it is known for a clock signal at a fixed frequency to be applied to the input of a counter which belongs to a counter circuit. A gate logic device is used to pass this clock signal through to the counter only during the signal time of interest and to mask it out otherwise. The counter thus does not count while the clock signal is masked out. If the count is reset to a predetermined reset value during the signal time which is not of interest, the count approximately corresponds to the time duration of the signal. If resetting to the reset value is not carried out, the count difference corresponds to the time duration of the signal. If it is intended to use this known counter circuit, for example, in the time-domain measurement of a digital signal having any periodic signal waveform, it is, however, disadvantageous that, if the count of the counter is intended to be used for a further assessment of events which define the duration of the digital signal, particularly short reaction times are possible only by means of very complex circuits and/or program structures because of the large number of events to be recorded.


SUMMARY OF THE INVENTION

It is an object of the present invention to provide an electronic counter of the above-described type which avoids the above-described disadvantages.
According to the invention, the electronic circuit device for analysis of a periodically repeating digital signal comprising a plurality of events, especially from a rotational position transmitter, comprises a first counter including means for counting a plurality of periodically generated pulses fed to the first counter; means for counting the events in each group; means for detecting the first event and the last event of each group; means for feeding the periodically generated pulses to the first counter between the first event and the last event detected by the means for detecting to form a counter count; and means for storing the counter count of the first counter determined by the first counter at the last event of each group.
In contrast, the electronic counter circuit according to the invention has the advantage that time-domain measurement of a digital signal having any periodic signal waveform is possible using simple circuit modules which can easily be implemented. Since a first counter counts periodically generated pulses which are passed through by a gate logic device only for the time which is defined by a first event and a last event of an event group and additional events, which are located between these events, are masked out, it is possible in a highly advantageous manner to process automatically virtually any periodic digital signal, without any further actions after the initialization, once the counter circuit has initially been synchronized, and at the same time to indicate a current count, even in the case of possibly defective signals, which count corresponds to the actual duration of the currently applied digit

REFERENCES:
patent: 4245605 (1981-01-01), Rice et al.
patent: 4267810 (1981-05-01), Wesemeyer et al.

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