US3854099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wideband coherent fm detector
Assignee: RFL IND Inc
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Filing: 1973-02-15
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Granted: 1974-12-10
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Expires: 1993-02-15
Abstract
Abstract An FM detector comprising integrators, differentiators, summers and multipliers arranged in two sections. One section functions as a wideband, coherent FM discriminator and the other section functions as a low-delay carrier suppressor. All of the components are compatible with integrated circuit technology.
Inventors
- 👤 E Kratt
- 👤 J Klapper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:11
CPC Classifications
H; H03; H03D; H03D3/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
Apparatus for demodulating a frequency modulated carrier wave, which apparatus comprises, a. a first network comprising a first integrator receiving said wave and producing a first output and a first differentiator receiving said wave and producing a second output, the two outputs being of substantially opposite polarity and having different amplitude vs frequency responses which cross at a predetermined frequency, b. circuit elements applying the said two outputs to a first summer producing substantially a zero output at said predetermined frequency, c. a first coherent amplitude detector having two inputs, and d. circuit elements applying the output of said summer to one input of said detector, the other input to said detector being dErived from the said first output, the output of said detector being the demodulated wave.
Claim 2
Dependent Claim
128 words
Apparatus for demodulating a frequency modulated carrier wave, which apparatus comprises, a. a first network comprising a first integrator receiving said wave and producing a first output and a first differentiator receiving said wave and producing a second output, the two outputs being of substantially opposite polarity and having different amplitude vs frequency responses which cross at a predetermined frequency, b. circuit elements applying the said two outputs to a first summer producing substantially a zero output at said predetermined frequency, c. a first coherent amplitude detector having two inputs, and d. circuit elements applying the output of said summer to one input of said detector, the other input to said detector being dErived from the said first output, the output of said detector being the demodulated wave.
Claim 3
Dependent Claim
57 words
Apparatus as recited in claim 1, including a means adding to said first summer a portion of the input of said first network, which portion is 180* out of phase with and equal in amplitude to the algebraic sum of the components of the said two outputs which are collinear with the input to said first network.
Claim 4
Dependent Claim
93 words
Apparatus as recited in claim 1, including a second network comprising a second integrator, a second coherent amplitude detector and a second summer, said second integrator receiving a signal derived from the said first summer, said second detector receiving one input derived from said second integrator and a second input derived from the input to said first network, and said second summer receiving a first input derived from said second detector and a second input derived from said first detector, the output of said second summer being the difference between its two inputs.
Claim 5
Dependent Claim
57 words
Apparatus as recited in claim 3, including means applying to the said first summer a portion of the input of said first network, which portion is 180* out of phase with and equal in amplitude to the algebraic sum of the components of the said two outputs which are collinear with the input to said first network.
Claim 6
Dependent Claim
49 words
Apparatus as recited in claim 4, including means adding a portion of the input of said second integrator to its output, which portion is 180* out of phase with and equal in amplitude to the component of the output of said second integrator which is collinear with its input.
Claim 7
Dependent Claim
60 words
Apparatus as recited in claim 1, including means adding a portion of the input of said first integrator to its output, which portion is 180* out of phase with and equal in amplitude to the algebraic sum of the components of the outputs of said first integrator and first differentiator which are collinear with the input to said first network.
Claim 8
Dependent Claim
60 words
Apparatus as recited in claim 1, including means adding a portion of the input of said first differentiator to its output, which portion is 180* out of phase with and equal in amplitude to the algebraic sum of the components of the outputs of said first integrator and first differentiator which are collinear with the input to said first network.
Claim 9
Dependent Claim
81 words
Apparatus as recited in claim 1, wherein the said predetermined frequency is different from the center frequency of the modulated carrier wave resulting in a d.c. component in the output of said first detector; and including a second summer having two inputs, the first input to said second summer being the output of the said first detector and the second input to said second summer being a d.c. voltage having a polarity and magnitude to substantially cancel the said d.c. component.
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |