US3820712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic tachometer
Assignee: International Business Machines Corp
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Filing: 1973-03-12
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Granted: 1974-06-28
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Expires: 1993-03-12
Abstract
Abstract An electronic tachometer for generating a continuous velocity output signal from the combination of a discontinuous position signal and a continuous acceleration signal is disclosed. The tachometer comprises a differentiating and timing means for receiving the discontinuous position signal and for developing and generating timing signals and a differentiated discontinuous position signal therefrom, and also signal processing circuitry for receiving and combining the differentiated discontinuous position signal and the timing signals and the continuous acceleration signal to form the continuous velocity output signal. The timing signals change the transfer function of the signal processing circuitry at specific times with relationship to the differentiated discontinuous position signal.
Inventors
- 👤 R Oswald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:16
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P7/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
An electronic tachometer for generating a continuous velocity output signal from the combination of a discontinuous position signal and a continuous acceleration signal, comprising: a differentiating and timing means for receiving said discontinuous position signal, for generating a plurality of timing signals from said discontinuous position signal, and for generating a differentiated discontinuous position signal from said discontinuus position signal in response to said generated timing signals, where said differentiated discontinuous position signal is an interrupted velocity signal; and signal processing circuitry for receiving said differentiated discontinuous position signal and for receiving at least one of said timing signals from said differentiating and timing means, and for receiving said continuous acceleration signal, said timing signals changing the transfer function of said signal processing circuitry at specific times with relationship to said discontinuous position signal for combining said differentiated discontinuous position signal and said continuous acceleration signal to form said continuous velocity signal.
Claim 2
Dependent Claim
152 words
An electronic tachometer for generating a continuous velocity output signal from the combination of a discontinuous position signal and a continuous acceleration signal, comprising: a differentiating and timing means for receiving said discontinuous position signal, for generating a plurality of timing signals from said discontinuous position signal, and for generating a differentiated discontinuous position signal from said discontinuus position signal in response to said generated timing signals, where said differentiated discontinuous position signal is an interrupted velocity signal; and signal processing circuitry for receiving said differentiated discontinuous position signal and for receiving at least one of said timing signals from said differentiating and timing means, and for receiving said continuous acceleration signal, said timing signals changing the transfer function of said signal processing circuitry at specific times with relationship to said discontinuous position signal for combining said differentiated discontinuous position signal and said continuous acceleration signal to form said continuous velocity signal.
Claim 3
Dependent Claim
47 words
The electronic tachometer set forth in claim 1, wherein said signal processing circuitry includes a low pass filter with a switchable time constant, said timing signals operating to switch said time constant of said low pass filter, thereby changing the transfer function of said signal processing circuitry.
Claim 4
Dependent Claim
37 words
The electronic tachometer set forth in claim 2, wherein said low pass filter comprises a switch in series with a resistor, said timing signals actuating said switch, thereby changing the effective resistance of said low pass filter.
Claim 5
Dependent Claim
48 words
The electronic tachometer set forth in claim 3, said low pass filter having a transfer function Tau /s Tau + 1, where Tau has a first value when said switch is open and a second value when said switch is closed, said value being deendent upon said resistor.
Claim 6
Dependent Claim
48 words
The electronic tachometer set forth in claim 3, said interrupted velocity signal comprising a plurality of time-separated segments taken from the continuous portions of said differentiated discontinuous position signal; and said timing signal opening said switch when each said time-separated segment is received by said signal processing circuitry.
Claim 7
Dependent Claim
118 words
The electronic tachometer set forth in claim 1, wherein said signal processing means comprises a first input resistor for receiving said differentiated discontinuous position signal, a second input resistor for receiving said continuous acceleration signal, an operational amplifier operably connected to said first and said second resistors, a feedback circuit interconnecting the output and the input of said operational amplifier, said feedback circuit having a first time constant and further comprising, switchable means for changing said time constant of said feedback circuit, said timing signal operably connected to said switchable means for effecting said change in said time constant, said amplifier combining said differentiated discontinuous position signal and said continuous acceleration signal to form said continuous velocity signal.
Claim 8
Dependent Claim
45 words
The electronic tachometer set forth in claim 6, where the values of said first resistor Tau 1/ Beta , said second resistor M/ Beta kf, said first time constant M/kv, and said switchable means comprises resistive means Having a resistance equal to said first resistor.
Claim 9
Dependent Claim
37 words
The electronic tachometer set forth in claim 7, wherein said feedback circuit comprises a capacitor and a third resistor in parallel for forming said first time constant, said third resistor being much larger than said resistive means.
Claim 10
Dependent Claim
39 words
The electronic tachometer set forth in claim 1, wherein said differentiating and timing means comprises means for differentiating said discontinuous position signal; and comparator means operably connected to said discontinuous position signal for generating specific ones said timing signals.
Claim 11
Dependent Claim
49 words
The electronic tachometer set forth in claim 9, and further comprising switch means for connecting the output of said differentiating means to said signal processing circuitry; and latch means for receiving timing signals from said comparator means and for deriving the timing signals for application to said switch means.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |