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US 4,789,838 AGranted
Pulse detection circuit using amplitude and time qualification
OwnerJyi-Min Chenginventor
Life of this patent
Estimating the term…
Abstract
A magnetic recording pulse detection circuit using a combination of amplitude and time qualification. An input signal is provided to a peak detecting circuit and to a comparator for comparing the input signal to a threshold level. A time delay circuit is also provided so that a peak detection output signal is provided only if the peak exceeds the threshold value and there has been no additional peak for a predetermined period of time.
Claims10
A pulse detection circuit comprising:
- means for detecting peaks in an input signal and producing a peak detect signal when a peak is detected;
- means for comparing said input signal to a threshold level;
- means, coupled to said means for detecting and said means for comparing, for producing an amplitude qualified peak output signal when a peak is detected above said threshold level;
- and
- means, having an input coupled to said means for producing an amplitude qualified peak output signal, and said means for detecting peaks, for producing a time qualified peak signal at an output after a predetermined delay from said amplitude qualified output signal if said peak detect signal is still present after said delay, said means for producing a time qualified peak signal being nonresponsive to signals at said input during said delay.
2 more elements
A pulse detection circuit comprising:
- a differentiator coupled to receive an input signal, said input signal being a differential signal coupled across first and second input lines;
- a zero-crossing comparator coupled to an output of said differentiator;
- a negative threshold comparator having a first input coupled to a first one of said input lines and a second input coupled to a first threshold voltage;
- a positive threshold comparator having a first input coupled to a second one of said input lines and a second input coupled to a second threshold voltage;
- a first AND gate having a first input coupled to an output of said negative threshold comparator and a second input coupled to a positive output of said zero-crossing comparator;
- a second AND gate having a first input coupled to an output of said positive threshold comparator and a second input coupled to a negative output of said zero-crossing comparator;
- an OR gate having first and second inputs coupled to outputs of said negative and positive threshold comparators, respectively;
- a one-shot delay circuit having an input coupled to an output of said OR gate;
- a latching flip-flop having a data input coupled to a positive output of said zero-crossing comparator and a clock input coupled to an output of said one-shot delay circuit.
6 more elements
A pulse detection method comprising:
- detecting peaks in an input signal and producing a peak detect signal when a peak is detected;
- comparing said input signal to a threshold level;
- producing a qualified peak output signal when a peak is detected above said threshold level;
- and
- disabling said output signal for a predetermined period of time after a peak is detected.
2 more elements
Dependencies are inferred from the claim text.