Patent US1740846A successfully refreshed from Google Patents.
Patent US3825842A successfully refreshed from Google Patents.
US3825842A
Expired / Lapsed
US
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Pulse rate discriminator generating output only at predetermined input frequency
Assignee: Individual
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Filing: 1973-04-18
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Granted: 1974-07-23
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Expires: 1993-04-18
Abstract
Abstract A pulse rate discriminator for generating an output signal only when the input signal thereto is of a predetermined frequency. A delay one-shot multivibrator means is connected to a pulsegenerating means which generates first pulses timed with every other axis crossing of the input signal. The delay one-shot multivibrator means generates a delay pulse of pre-set duration which duration is a first predetermined fraction of the period corresponding to said predetermined frequency. A pulse one-shot multivibrator means is connected to the delay multivibrator means for generating second pulses the duration of which are a second predetermined fraction of the period corresponding to said predetermined frequency. An AND gate is connected to the pulse generating means and to the pulse one-shot multivibrator means for generating a coincidence signal each time the first and second pulses coincide and means is provided for detecting the coincidence signals and for generating the output signal only when a predetermined minimum number of the coincidence signals are detected.
Inventors
- 👤 R Moss
- 👤 J Birchfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:06
CPC Classifications
G; G08; G08B; G08B13/00; G08B17/00; H; H03; H03K; H03K9/00; H03K9/06; H04; H04B; H04B7/00; H04B7/02; H04B7/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
205 words
A pulse rate discriminator for generating an output signal only when the input wave signal to the discriminator is of a predetermined frequency comprising, pulse generating means for generating first pulses timed with every other axis crossing of said input wave, delay one shot multivibrator means connected to said pulse generating means for generating a delay pulse of preset duration when triggered by said first pulses, said preset duration being a first predetermined fraction of the period corresponding to said predetermined frequency, pulse one shot multivibrator means connected to said delay multivibrator means for generating second pulses when triggered by said delay pulses, the duration of said second pulses being a second predetermined fraction of the period corresponding to said predetermined frequency, said second predetermined fraction being smaller than said first predetermined fraction, said first and second predetermined fractions adding up to more than one, an AND gate connected to said pulse generating means and to said pulse one shot multivibrator means for generating a coincidence signal each time said first and second pulses coincide, and means for detecting said coincidence signals generated by said AND gate and for generating said output signal only when a predetermined minimum number of said coincidence signals is detected.
Claim 2
Dependent Claim
205 words
A pulse rate discriminator for generating an output signal only when the input wave signal to the discriminator is of a predetermined frequency comprising, pulse generating means for generating first pulses timed with every other axis crossing of said input wave, delay one shot multivibrator means connected to said pulse generating means for generating a delay pulse of preset duration when triggered by said first pulses, said preset duration being a first predetermined fraction of the period corresponding to said predetermined frequency, pulse one shot multivibrator means connected to said delay multivibrator means for generating second pulses when triggered by said delay pulses, the duration of said second pulses being a second predetermined fraction of the period corresponding to said predetermined frequency, said second predetermined fraction being smaller than said first predetermined fraction, said first and second predetermined fractions adding up to more than one, an AND gate connected to said pulse generating means and to said pulse one shot multivibrator means for generating a coincidence signal each time said first and second pulses coincide, and means for detecting said coincidence signals generated by said AND gate and for generating said output signal only when a predetermined minimum number of said coincidence signals is detected.
Claim 3
Dependent Claim
20 words
The pulse rate discriminator of claim 1 wherein said first predetermined fraction is substantially greater than said second predetermined fraction.
Claim 4
Dependent Claim
23 words
The pulse rate discriminator of claim 2 wherein said first predetermined fraction is approximately 9/10 and said second predetermined fraction is approximately 2/10.
Claim 5
Dependent Claim
37 words
The pulse rate discriminator of claim 1 wherein said delay one shot multivibrator means is a resettable multivibrator means which only operates when the rate of occurrence of said first pulses is less than a predetermined frequency.
Claim 6
Dependent Claim
54 words
The pulse rate discriminator of claim 2 wherein said means for detecting said coincidence signals includes a counter means for counting said coincidence signals and a two state detector, said counter means being operative to turn said two state detector to the on state when a predetermined count of said coincidence signal is reached.
Claim 7
Dependent Claim
47 words
The pulse rate discriminator of claim 5 further including a dump one shot multivibrator means connected between said AND gate and said pulse counter means for dumping the count of said pulse counter means if the time period between two successive coincidence signals exceeds a predetermined maximum.
Claim 8
Dependent Claim
22 words
The pulse rate discriminator of claim 6 wherein said predetermined maximum is approximately 1.5 times the period corresponding to said predetermined frequency.
Claim 9
Dependent Claim
55 words
The pulse rate discriminator of claim 6 wherein said pulse counteR means generates a ramp output signal, the amplitude of which is proportional to the number of coincidence signals counted and wherein said two state detector is a level detector which turns to the on state when said ramp output signal exceeds a predetermined level.
Claim 10
Dependent Claim
68 words
The pulse rate discriminator of claim 6 wherein said two state level detector is connected to a charging network which is connected to an output pulse generator means, said charging network being charged when said two state detector is in the on state and said output pulse generator means being operative to generate said output pulse when the voltage across said charging network reaches a given minimum value.
Claim 11
Dependent Claim
44 words
The pulse rate discriminator of claim 9 wherein said dump one shot multivibrator means is also connected to said two state level detector for turning said level detector to the off state if the time period between said coincidence signals exceeds a predetermined maximum.
Claim 12
Dependent Claim
19 words
The pulse rate discriminator of claim 10 wherein the time constant of said charging network is approximately 100 milliseconds.
Claim 13
Dependent Claim
17 words
The pulse rate discriminator of claim 11 wherein said two state level detector is a Schmitt detector.
Claim 14
Dependent Claim
27 words
The pulse rate discriminator of claim 11 wherein said pulse generating means for generating said first pulses includes a Schmitt trigger means and a pulse shaper means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |