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Patent US3757100A successfully refreshed from Google Patents.
US3757100A
Expired / Lapsed
US
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Trigonometric segment discriminator
Assignee: LEAK SIEGLER Inc
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Filing: 1972-03-13
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Granted: 1973-09-04
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Expires: 1992-03-13
Abstract
Abstract A trigonometric segment discriminator circuit for selecting a portion of a sinusoidal signal for use as a control signal, is disclosed. Sinusoidal signals in the form of coarse sine and fine cosine signals are applied to the discriminator circuit to produce an inhibit signal which, when summed with a selected zero cross-over portion of a fine sine signal, provides a control signal characterized by a generally linearly increasing segment extending between steady state low and high portions. The discriminator circuit includes a pair of operational amplifiers that are connected in parallel to respectively provide a high, a low, and a zero output voltage signal in response to the level of the fine cosine and coarse sine signals applied thereto. A limiting amplifier may be used as a summing circuit to combine the inhibit signal with the fine sine signal.
Inventors
- 👤 M Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:17
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/04; G05D1/042; G06; G06G; G06G7/00; G06G7/48; G06G7/78
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
214 words
A discriminator circuit for providing an output signal that can be used to isolate a selected portion of a sinusoidally fluctuating signal when combined therewith, the discriminator circuit comprising: first means for providing positive output signals in response to the application of positive signals at an input thereof; second means for providing negative output signals in response to the application of negative signals at an input thereof; means for enabling the application of a coarse signal to said first and second means, said coarse signal having an amplitude that may vary from a Negative value to a positive value, a zero value separating said positive and negative values and occurring coincidently with the portion to be selected of a sinusoidally fluctuating signal, said first and second means respectively providing positive and negative output signals in accordance with the amplitude and polarity of said coarse signal; and biasing means for providing a biasing signal to said first and second means, said biasing signal having an amplitude that varies as a square wave function between a zero value and a selected negative value, said first and second means being maintained to have a zero value output signal by said bias signal when having an absolute amplitude exceeding the positive or negative value of said coarse signal.
Claim 2
Dependent Claim
214 words
A discriminator circuit for providing an output signal that can be used to isolate a selected portion of a sinusoidally fluctuating signal when combined therewith, the discriminator circuit comprising: first means for providing positive output signals in response to the application of positive signals at an input thereof; second means for providing negative output signals in response to the application of negative signals at an input thereof; means for enabling the application of a coarse signal to said first and second means, said coarse signal having an amplitude that may vary from a Negative value to a positive value, a zero value separating said positive and negative values and occurring coincidently with the portion to be selected of a sinusoidally fluctuating signal, said first and second means respectively providing positive and negative output signals in accordance with the amplitude and polarity of said coarse signal; and biasing means for providing a biasing signal to said first and second means, said biasing signal having an amplitude that varies as a square wave function between a zero value and a selected negative value, said first and second means being maintained to have a zero value output signal by said bias signal when having an absolute amplitude exceeding the positive or negative value of said coarse signal.
Claim 3
Dependent Claim
105 words
The discriminator circuit defined by claim 1, said first means including: a first operational amplifier having a non-inverting input terminal to which said coarse signal is applied, and means connected to the output of said first operational amplifier for only transmitting to an output of said first means positive signals provided by said first operational amplifier; said second means including: a second operational amplifier having a non-inverting input terminal to which said coarse signal is applied, and means connected to the output of said second operational amplifier for only transmitting to an output of said second means negative signals provided by said second operational amplifier.
Claim 4
Dependent Claim
40 words
The discriminator circuit defined by claim 2, said means connected to the output of said first operational amplifier including a semiconductor device that is connected to be forward biased when the output signal of said first operational amplifier is positive.
Claim 5
Dependent Claim
40 words
The discriminator circuit defined by claim 3, said means connected to the output of said second operational amplifier including a semiconductor device that is connected to be forward biased when the output signal of said second operational amplifier is negative.
Claim 6
Dependent Claim
142 words
The discriminator circuit defined by claim 1, said first means and said second means respectively including first and second operational amplifiers each having a non-inverting input terminal to which said coarse signal is applied, said first operational amplifier having connected to an output thereof first semiconductor means for only transmitting positive output signals provided by said first operational amplifier, said second operational amplifier having connected to an output thereof second semiconductor means for only transmitting negative output signals provided by said second operational amplifier, said bias signal being applied to the non-inverting input terminal of said first operational amplifier and to an inverting input terminal of said second operational amplifier to maintain the output signals of both said first and second means at said zero level when the amplitude of said coarse signal is less than the amplitude of said bias signal.
Claim 7
Dependent Claim
73 words
The discriminator circuit defined by claim 1, said biasing means including: sign sensor means, connected to receive a sinusoidally fluctuating signal having a maximum value occurring coincidently with said zero value of said coarse signal, for providing a square wave signal that is in-phase with said sinusoidally fluctuating signal applied to said sensor means; and inverter means for inverting said square wave signal from said sign sensor means to provide said bias signal.
Claim 8
Dependent Claim
26 words
The discriminator circuit defined by claim 6, said inverter means including means for adjusting the range of voltages between which said bias is intended to vary.
Claim 9
Dependent Claim
142 words
The discriminator circuit defined by claim 7, said first means and said second means respectively including first and second operational amplifiers each having a non-inverting input terminal to which said coarse signal is applied, said first operational amplifier having connected to an output thereof first semiconductor means for only transmitting positive output signals provided by saiD first operational amplifier, said second operational amplifier having connected to an output thereof second semiconductor means for only transmitting negative output signals provided by said second operational amplifier, said bias signal being applied to the non-inverting input terminal of said first operational amplifier and to an inverting input terminal of said second operational amplifier to maintain the output signals of both said first and second means at said zero level when the amplitude of said coarse signal is less than the amplitude of said bias signal.
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 |