US3828259A
Expired / Lapsed
US
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Peak detector
Assignee: PE Manufacturing GmbH
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Filing: 1973-02-07
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Granted: 1974-08-06
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Expires: 1993-02-07
Abstract
Abstract A known peak detector for detection of peaks in an input signal includes a signal integrator for integrating the signal change over successive short measuring intervals which integrator is reset to zero at the end of each interval and also includes a comparator for comparing the integrator output with a reference quantity. In the disclosed device the reference quantity rises with time in each of the measuring intervals. Since the contribution of a base line shift yields a linearly rising integrator output, the comparator is therefore less sensitive to such base line shifts. Preferably the reference quantity starts at a non-zero constant level and then rises linearly during the later portion of the measuring interval. The comparators therefore do not mistake either noise (which is typically in the form of very short fluctuations so as to yield a sudden moderate plateau in the integrator output) or base line drift (which causes a linearly rising integrator output) for a true peak in the input signal, since the integral of the beginning of a true peak having constantly increasing slope will be a quadratically rising signal (so that it crosses the reference quantity straight line signal before the end of the measuring interval).
Inventors
- 👤 L Riethmuller
- 👤 R Sponholz
- 👤 H Kiefer
- 👤 E Spreitzhofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:33
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/153; H03K5/1532
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
In a peak detector for the detection of a signal peak comprising a signal detector including a signal integrator which integrates the signal change during successive short measuring intervals and is automatically reset to zero at the end of each measuring interval, and further comprising a comparator for comparing the integrator output with a reference quantity, by having applied thereto the output of the signal integrator, the improvement comprising: the means for generating said reference quantity is of such construction that said reference quantity remains at a constant non-zero value during an initial portion of each measuring interval and then rises with time during the remaining part of each measuring interval.
Claim 2
Dependent Claim
111 words
In a peak detector for the detection of a signal peak comprising a signal detector including a signal integrator which integrates the signal change during successive short measuring intervals and is automatically reset to zero at the end of each measuring interval, and further comprising a comparator for comparing the integrator output with a reference quantity, by having applied thereto the output of the signal integrator, the improvement comprising: the means for generating said reference quantity is of such construction that said reference quantity remains at a constant non-zero value during an initial portion of each measuring interval and then rises with time during the remaining part of each measuring interval.
Claim 3
Dependent Claim
68 words
A peak detector as claimed in claim 1, in which: a differentiating means differentiates the input signal; an integrating stage integrates the output of said differentiating means before the thus differentiated and integrated input signal is supplied tO said integrator for integrating said signal during successive short measuring intervals; and resetting means reset said integrating stage and said integrator to zero at the beginning of each measuring interval.
Claim 4
Dependent Claim
39 words
A peak detector as claimed in claim 1, in which: said reference quantity generating means is of such further construction that said rise of the reference quantity takes place linearly from the non-zero level of said constant initial portion.
Claim 5
Dependent Claim
76 words
A peak detector as claimed in claim 3, in which: said reference quantity generating means comprises a Miller-integrator including an amplifier of high gain, the output of which is fed back via an ohmic resistor and a capacitor in series to the input, that to the input of the amplifier a constant voltage is applied, and that the capacitor is shunted by a circuit element which is energized during the initial portion of each measuring interval.
Claim 6
Dependent Claim
76 words
A peak detector as claimed in claim 4, further comprising: a counter, to which counting pulses at a fixed rate are supplied by a pulse generator, for the determination of the measuring interval length; and a monostable flip-flop energized by said counter after a given pulse number which, on the one hand, energizes said circuit element in said reference quantity generating means and, on the other hand, resets said signal integrator and said counter to zero.
Claim 7
Dependent Claim
50 words
A peak detector as claimed in claim 5, in which: said monostable flip-flop is also energizable by the output of the comparator in addition to by the counter output, whereby said reference quantity generating means and said signal integrator are reset when the integrated input signal exceeds said reference quantity.
Claim 8
Dependent Claim
108 words
A peak detector as claimed in claim 1, in which: the comparator comprises a first and second comparator means; each of said comparator means is constituted by a difference amplifier including an inverting and a non-inverting input and a feedback branch from the output to the noninverting input having in series an ohmic resistor and a diode in blocking direction; the first comparator means having supplied the integrator output to its inverting input and the analog reference quantity to its non-inverting input; the second comparator means having supplied the integrator output to its non-inverting input, and the reference signal is inverted and then supplied to its inverting input.
Claim 9
Dependent Claim
73 words
A peak detector as claimed in claim 1, in which: the signal integrator comprises a voltage-to-frequency converter including a first counter to which the output pulses thereof are applied; a second counter is provided into which a fixed frequency is counted by a pulse generator, the contents of said second counter being the reference quantity; and the comparator receives and compares the counter readings of the first and of the second counter digitally.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |