US3896385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and instrument for measuring interference between angle modulated systems
Assignee: International Telecommunications Satellite Organization
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Filing: 1974-01-29
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Granted: 1975-07-22
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Expires: 1994-01-29
Abstract
Abstract The interference component resulting from the interference between two angle modulated carriers is obtained without loading the desired carrier. The interfering carrier is equivalently loaded with a baseband signal that is the difference between first and second baseband signals. The equivalently loaded interfering carrier is combined with the unmodulated desired carrier. The interference component resulting from interference with the equivalently loaded interfering carrier is the same as would occur had both carriers been separately loaded with the first and second baseband signals, respectively. The desired carrier is then demodulated to obtain the interference component.
Inventors
- 👤 Nand Kishore M Chitre
- 👤 Benjamin Anthony Pontano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:59
CPC Classifications
G; G01; G01R; G01R29/00; H; H04; H04B; H04B14/00; H04B14/002; H04B14/006
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
71 words
A method of measuring the interference component resulting from an interfering carrier angle modulated with baseband phi 2(t) interfering with a desired carrier angle modulated with baseband phi 1(t) comprising the steps of a. angle modulating said interfering carrier with a baseband phi (T) where phi (T) + phi 2(t) - phi 1(t), b. combining said angle modulated interfering carrier with said desired carrier, unmodulated, and c. demodulating said desired carrier.
Claim 2
Independent Claim
71 words
A method of measuring the interference component resulting from an interfering carrier angle modulated with baseband phi 2(t) interfering with a desired carrier angle modulated with baseband phi 1(t) comprising the steps of a. angle modulating said interfering carrier with a baseband phi (T) where phi (T) + phi 2(t) - phi 1(t), b. combining said angle modulated interfering carrier with said desired carrier, unmodulated, and c. demodulating said desired carrier.
Claim 3
Dependent Claim
20 words
The method as claimed in claim 1 further comprising displaying the spectrum resulting from the demodulation of said desired carrier.
Claim 4
Dependent Claim
16 words
The method as claimed in claim 2 wherein the step of angle modulation comprises frequency modulation.
Claim 5
Dependent Claim
114 words
Apparatus for obtaining a spectrum representing the interference component which would result from interference between two baseband angle modulated carriers, comprising a. means responsive to two input baseband signals for forming a third baseband signal which is the difference between the first and second baseband signals, b. means for angle modulating a first carrier frequency with said third baseband signal, c. means for summing said angle modulated first carrier with an unmodulated second carrier frequency, d. angle demodulator means responsive to the output of said summing means for angle demodulating said second carrier frequency, and e. read out means responsive to the output from said angle demodulator for reading out the resulting interference component.
Claim 6
Dependent Claim
114 words
Apparatus for obtaining a spectrum representing the interference component which would result from interference between two baseband angle modulated carriers, comprising a. means responsive to two input baseband signals for forming a third baseband signal which is the difference between the first and second baseband signals, b. means for angle modulating a first carrier frequency with said third baseband signal, c. means for summing said angle modulated first carrier with an unmodulated second carrier frequency, d. angle demodulator means responsive to the output of said summing means for angle demodulating said second carrier frequency, and e. read out means responsive to the output from said angle demodulator for reading out the resulting interference component.
Claim 7
Dependent Claim
15 words
Apparatus as claimed in claim 4 wherein said readout means is a visual display means.
Claim 8
Dependent Claim
23 words
Apparatus as claimed in claim 4 wherein said angle modulation means and said angle demodulation means are a frequency modulator and demodulator respectively.
Claim 9
Dependent Claim
23 words
Apparatus as claimed in claim 4 further comprising attenuator means for varying the relative powers of said two basebands and said unmodulated carrier.
Claim 10
Dependent Claim
81 words
Apparatus as claimed in claim 4 wherein said means for forming said third baseband signal comprises, a. a first variable attenuator adapted to receive and attenuate said first baseband signal, b. a second attenuator adapted to receive and attenuate said second baseband signal, c. an inverting means connected to said second attenuator for inverting said attenuated second baseband signal, and d. second summing means connected to the outputs of said first attenuator means and said inverting means for summing said outputs.
References Cited (Backward Citations)
US3691467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |