US3757132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the detection of rectangular pulses
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1972-03-24
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Granted: 1973-09-04
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Expires: 1992-03-24
Abstract
Abstract The invention refers to an apparatus for the detection of rectangular pulses in which the duration of the leading edge and the trailing edge respectively is constant whereas the peak amplitude can fluctuate. The apparatus includes a comparison circuit that compares the instantaneous amplitude of the rectangular pulses with the amplitude of a reference voltage and which upon equality between the levels of the amplitudes being compared delivers an indicating pulse. According to the invention, the reference voltage is, during the leading edges formed by the output voltage from a differentiating circuit which is fed with the rectangular pulses and which during each of their leading edges delivers an output voltage the time function of which has such a predetermined intersection point with the time function of the leading edge that the amplitude value at the intersection point equals a selected fraction of the peak amplitude of the rectangular pulse.
Inventors
- 👤 L Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:07
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H03; H03K; H03K5/00; H03K5/153
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
194 words
Apparatus for detecting first signals whose instantaneous amplitude varies in time to define rectangular pulses which have leading and trailing edges of constant duration and peak amplitudes which can fluctuate, said apparatus comprising input means for receiving the first signals, signal differentiating means having an input connected to said input means and an output which signal differentiating means during the time of occurrence of the leading edge of each rectangular pulse transmits a timevarying output signal whose time function has a predetermined intersection point with the time function of the leading edge of the rectangular pulse such that the amplitude value at said intersection point equals a selected fraction of the peak amplitude of the rectangular pulse, said peak amplitude being predetermined by the time function of the leading edge of the rectangular pulse, a signal amplitude comparison means having an unknown signal input connected to said input means, a referencesignal input connected to the output of said signal differentiating means and an indicating-signal output for transmitting an indicating signal when the amplitude of the signal present at said unknown signal input equals the amplitude of the signal present at said reference signal input.
Claim 2
Dependent Claim
194 words
Apparatus for detecting first signals whose instantaneous amplitude varies in time to define rectangular pulses which have leading and trailing edges of constant duration and peak amplitudes which can fluctuate, said apparatus comprising input means for receiving the first signals, signal differentiating means having an input connected to said input means and an output which signal differentiating means during the time of occurrence of the leading edge of each rectangular pulse transmits a timevarying output signal whose time function has a predetermined intersection point with the time function of the leading edge of the rectangular pulse such that the amplitude value at said intersection point equals a selected fraction of the peak amplitude of the rectangular pulse, said peak amplitude being predetermined by the time function of the leading edge of the rectangular pulse, a signal amplitude comparison means having an unknown signal input connected to said input means, a referencesignal input connected to the output of said signal differentiating means and an indicating-signal output for transmitting an indicating signal when the amplitude of the signal present at said unknown signal input equals the amplitude of the signal present at said reference signal input.
Claim 3
Dependent Claim
35 words
The apparatus of claim 1 further comprising a source of a fixed potential connected to the reference-signal input of said signal amplitude comparison means in parallel with the output of a said signal differentiating means.
Claim 4
Dependent Claim
36 words
The apparatus of claim 2 further comprising signal isolation means for connecting the output of said signal differentiating means and said source of fixed potential respectively to the reference-signal input of said signal amplitude comparison means.
Claim 5
Dependent Claim
19 words
The apparatus of claim 1 wherein said signal differentiating means comprises an operational amplifier having a resistor-capacitor feedback network.
Claim 6
Dependent Claim
17 words
The apparatus of claim 1 wherein said selected fraction of said peak amplitude is equal to one-half.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |