US3628155A
Expired / Lapsed
US
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Amplitude modulation intensifier method and apparatus
Assignee: Individual
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Filing: 1969-01-03
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Granted: 1971-12-14
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Expires: 1989-01-03
Abstract
Abstract An amplitude-modulated RF carrier wave is separately mixed with two phase-locked frequency waves, one lower than the carrier by an amount equal to a desired intermediate frequency, and the other higher by the same amount. The two resulting IF''s are added to give an IF output with an improved signal-to-noise ratio over the RF wave. The inventive apparatus includes the necessary means for generating the two waves, for mixing, etc.
Inventors
- 👤 Anthony G Muzzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:48
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04B1/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
74 words
A method of intensifying signals carried by an amplitude modulated carrier, including the steps of: simultaneously mixing said carrier with a first local frequency higher than said carrier by a predetermined intermediate frequency and a second local frequency lower than said carrier by said intermediate frequency, to produce first and second intermediate frequency spectrums; band-pass filtering said first and second spectrums to obtain two intermediate frequency signals; and adding said two intermediate frequency signals.
Claim 2
Independent Claim
74 words
A method of intensifying signals carried by an amplitude modulated carrier, including the steps of: simultaneously mixing said carrier with a first local frequency higher than said carrier by a predetermined intermediate frequency and a second local frequency lower than said carrier by said intermediate frequency, to produce first and second intermediate frequency spectrums; band-pass filtering said first and second spectrums to obtain two intermediate frequency signals; and adding said two intermediate frequency signals.
Claim 3
Dependent Claim
44 words
The method as set forth in claim 1 wherein said local frequencies are generated by: band-pass filtering said carrier; mixing the resulting wave with the output of a local oscillator; and band-pass filtering the resulting mixture to obtain said first and second local frequencies.
Claim 4
Dependent Claim
49 words
The method as set forth in claim 1 wherein said local frequencies are generated by: synchronizing a first local oscillator with said carrier; mixing the resulting wave with the output of a second local oscillator, and band-pass filtering the resulting mixture to obtain said first and second local frequencies.
Claim 5
Dependent Claim
21 words
The method as recited in claim 1 wherein said two intermediate frequency signals have fundamental frequencies of identical frequency and phase.
Claim 6
Independent Claim
240 words
An apparatus for intensifying signals carried by an amplitude-modulated RF carrier including: RF-receiving means; first and second mixers each having first and second inputs and an output; frequency providing means having at least two outputs for providing respectively a first local frequency higher than said carrier by a predetermined intermediate frequency and a second local frequency lower than said carrier by said intermediate frequency on said outputs; said RF-receiving means connected to said first input of each of said mixers, and one each of said outputs of said frequency providing means respectively connected to one each of said second inputs of said mixers; first and second IF filters each having an input and an output; and adder means having two inputs and an output; wherein said output of said first mixer is connected to the said input of said first IF filter, and said output of said second mixer is connected to said input of said second IF filter, and said outputs of said filters are connected to respective inputs of said adder and said frequency providing means includes: a carrier band-pass filter connected to said receiving means; a mixer having two inputs and an output, with one of said inputs connected to said band-pass filter; an oscillator having an output connected to the other input of said mixer; first and second band-pass filters, each having an input connected to the output of said mixer, and each having an output.
Claim 7
Independent Claim
240 words
An apparatus for intensifying signals carried by an amplitude-modulated RF carrier including: RF-receiving means; first and second mixers each having first and second inputs and an output; frequency providing means having at least two outputs for providing respectively a first local frequency higher than said carrier by a predetermined intermediate frequency and a second local frequency lower than said carrier by said intermediate frequency on said outputs; said RF-receiving means connected to said first input of each of said mixers, and one each of said outputs of said frequency providing means respectively connected to one each of said second inputs of said mixers; first and second IF filters each having an input and an output; and adder means having two inputs and an output; wherein said output of said first mixer is connected to the said input of said first IF filter, and said output of said second mixer is connected to said input of said second IF filter, and said outputs of said filters are connected to respective inputs of said adder and said frequency providing means includes: a carrier band-pass filter connected to said receiving means; a mixer having two inputs and an output, with one of said inputs connected to said band-pass filter; an oscillator having an output connected to the other input of said mixer; first and second band-pass filters, each having an input connected to the output of said mixer, and each having an output.
Claim 8
Dependent Claim
25 words
The apparatus as defined in claim 5, wherein said outputs of said first and second IF filters have fundamental frequencies identical in frequency and phase.
Claim 9
Independent Claim
240 words
An apparatus for intensifying signals carried by an amplitude modulated RF carrier including: RF-receiving means; first and second mixers each having at least first and second inputs and an output; frequency providing means having at least two outputs for providing a first local frequency higher than said carrier by a predetermined intermediate frequency and a second local frequency lower than said carrier by said intermediate frequency on said outputs; said RF-receiving means connected to said first input of each of said mixers and one each of said outputs of said frequency-providing means respectively connected to one each of said second inputs of said mixers; first and second IF filters each having an input and an output; and adder means having two inputs and an output; wherein said output of said first mixer is connected to the input of said first IF filters, and said output of said second mixer is connected to said input of said second IF filter, and said outputs of said filters are connected to respective inputs of said adder and said frequency-providing means includes: a carrier synchronized oscillator connected to said receiving means; a mixer having two inputs and an output with one of said inputs connected to said carrier-synchronized oscillator; a local oscillator having an output connected to the other input of said mixer; first and second band-pass filters each having an input connected to the output of said mixer, and each having an output.
Claim 10
Independent Claim
240 words
An apparatus for intensifying signals carried by an amplitude modulated RF carrier including: RF-receiving means; first and second mixers each having at least first and second inputs and an output; frequency providing means having at least two outputs for providing a first local frequency higher than said carrier by a predetermined intermediate frequency and a second local frequency lower than said carrier by said intermediate frequency on said outputs; said RF-receiving means connected to said first input of each of said mixers and one each of said outputs of said frequency-providing means respectively connected to one each of said second inputs of said mixers; first and second IF filters each having an input and an output; and adder means having two inputs and an output; wherein said output of said first mixer is connected to the input of said first IF filters, and said output of said second mixer is connected to said input of said second IF filter, and said outputs of said filters are connected to respective inputs of said adder and said frequency-providing means includes: a carrier synchronized oscillator connected to said receiving means; a mixer having two inputs and an output with one of said inputs connected to said carrier-synchronized oscillator; a local oscillator having an output connected to the other input of said mixer; first and second band-pass filters each having an input connected to the output of said mixer, and each having an output.
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) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |