US3631469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Systems for comparing electrical signals
Assignee: US Philips Corp
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Filing: 1969-08-28
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Granted: 1971-12-28
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Expires: 1989-08-28
Abstract
Abstract The present invention features a system for comparing the amplitudes and signs of two simultaneous electrical signals. A chain of discriminators is arranged to determine with successively greater resolution the angle P tan -1 X/Y) where X and Y respectively have the signs and amplitudes of each of the said two signals. In each discriminator except the first in the chain means are provided for inhibiting or correcting errors in the immediately preceding discriminator.
Inventors
- 👤 Ralph Levy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:27
CPC Classifications
H; H03; H03M; H03M1/00; G; G01; G01S; G01S1/00; G01S1/02; H03M1/12; H03M1/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
A system for comparing the amplitude and polarities of two simultaneous pulsed wide range direct current electrical signals representing the sine and cosine components of an angle to be measured comprising; first discriminator means for producing a first digital output quantity having a value determined by the magnitude and polarity of said input signals and indicating to a first approximation the angle to be measured, electrical scale expansion means coupled to receive said input signals for producing angular scale expansion of the angle said signals represent, second discriminator means coupled to said scale expansion means for producing a second digital output quantity indicating to a second approximation the angle to be measured; and correction means receiving continuously the entire second output for parallel correction of any errors in said first output whereby the angle to be measured is computed with greater accuracy.
Claim 2
Independent Claim
142 words
A system for comparing the amplitude and polarities of two simultaneous pulsed wide range direct current electrical signals representing the sine and cosine components of an angle to be measured comprising; first discriminator means for producing a first digital output quantity having a value determined by the magnitude and polarity of said input signals and indicating to a first approximation the angle to be measured, electrical scale expansion means coupled to receive said input signals for producing angular scale expansion of the angle said signals represent, second discriminator means coupled to said scale expansion means for producing a second digital output quantity indicating to a second approximation the angle to be measured; and correction means receiving continuously the entire second output for parallel correction of any errors in said first output whereby the angle to be measured is computed with greater accuracy.
Claim 3
Dependent Claim
42 words
A system as claimed in claim 1 wherein said scale expansion means expands the scale of said second discriminator to four times that of said preceding first discriminator, whereby the output quantities represent successive Cartesian quadrants of the angle to be measured.
Claim 4
Dependent Claim
30 words
A system as claimed in claim 2 further comprising means for producing the four quadrants of the output of the second discriminator wholly within one quadrant of the first discriminator.
Claim 5
Dependent Claim
40 words
A system as claim 2 further comprising means for producing the boundaries between adjacent quadrants in the first discriminator wholly contained within one particular quadrant of the second discriminator whereby the second discriminator generates output signals to indicate said boundaries.
References Cited (Backward Citations)
US3068456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |