US3624529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse width signal demodulator
Assignee: Colt Industries Operating Corp
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Filing: 1969-11-25
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Granted: 1971-11-30
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Expires: 1989-11-25
Abstract
Abstract A demodulator circuit for providing a DC output signal which is unaffected by variations in pulse amplitude or repetition rate of a pulse width modulated input signal. The demodulator comprises switching circuitry and a pair of integrators. The switching circuitry controls the integrators whereby they function as holding generators with a short time lag; input pulses being applied alternately to the integrators which in turn provide DC output levels which are alternately measured.
Inventors
- 👤 Edward F Gebelein Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:30
CPC Classifications
H; H03; H03K; H03K9/00; H03K9/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
125 words
A demodulator cOmprising: first and second sample and hold circuits, said circuits having input and output terminals; means for applying serially received input pulses alternately to said first and second sample and hold circuit input terminals; an output terminal; selector means for alternately connecting said output terminal to said sample and hold circuit output terminals, said selector means being connected to said applying means and operating in synchronism with said applying means to connect to said output terminal the output of the sample and hold circuit when has sampled the most recently received input pulse; and means connected to said applying means and operating in synchronism therewith for resetting said sample and hold circuits upon disconnection thereof from said output terminal by said selector means.
Claim 2
Dependent Claim
125 words
A demodulator cOmprising: first and second sample and hold circuits, said circuits having input and output terminals; means for applying serially received input pulses alternately to said first and second sample and hold circuit input terminals; an output terminal; selector means for alternately connecting said output terminal to said sample and hold circuit output terminals, said selector means being connected to said applying means and operating in synchronism with said applying means to connect to said output terminal the output of the sample and hold circuit when has sampled the most recently received input pulse; and means connected to said applying means and operating in synchronism therewith for resetting said sample and hold circuits upon disconnection thereof from said output terminal by said selector means.
Claim 3
Dependent Claim
29 words
The demodulator of claim 1 wherein said sample sand hold circuits each comprise: integrator means for providing an output potential commensurate with the duration of an applied input signal.
Claim 4
Dependent Claim
78 words
The demodulator of claim 1 wherein said applying means comprises: first switch means for selectively applying input pulses to either of said sample and hold circuits; means responsive to received input pulses for generating switching control signals, successively received input pulses causing said switching control signals to vary whereby said first switch means will route successive input pulses to alternate sample and hold circuits; and means applying signals provided by said generating means to said first switch means.
Claim 5
Dependent Claim
29 words
The demodulator of claim 3 wherein said sample and hold circuits each comprise: integrator means for providing an output potential commensurate with the duration of an applied input signal.
Claim 6
Dependent Claim
57 words
The demodulator of claim 4 wherein said resetting means comprises: second and third switch means respectively connected across said integrator means, said second and third switch means being responsive to said switching control signals for alternately short circuiting said integrator means; and means applying signals provided by said generating means to said second and third switch means.
Claim 7
Dependent Claim
29 words
The demodulator of claim 5 further comprising: means applying the input pulses to said second and third switch means, the input pulses disabling said second and third switch means.
Claim 8
Dependent Claim
32 words
The demodulator of claim 6 wherein said selector means comprises: fourth switch means, said fourth switch means being connected to said switching control signal-generating means and being responsive to signals provided thereby.
References Cited (Backward Citations)
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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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |