US3961288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double sideband suppressed carrier modulator using surface wave device
Assignee: Raytheon Co
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Filing: 1975-04-28
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Granted: 1976-06-01
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Expires: 1995-04-28
Abstract
Abstract An apparatus and method for generating a double sideband suppressed carrier signal utilizing a surface wave device. Three equally spaced surface wave transducers are formed on a surface wave propagating medium along a common acoustic channel. An RF carrier signal is applied to one of the outer surface wave transducers and an RF carrier amplitude modulated signal is applied to the remaining outer surface wave transducer. The centrally positioned surface wave transducer receives the modulated and the unmodulated RF carrier signals transmitted by the transducers along the acoustic channel 180° out of phase. The received RF carrier signals cancel leaving the two sideband signals present at the centrally positioned transducer.
Inventors
- 👤 Robert S. Gordy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:40
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/52; H03C1/46
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
90 words
Apparatus for generating a double sideband suppressed carrier signal comprising: a surface wave propagating medium; three spaced apart surface wave transducers positioned on a surface of said surface wave propagating medium; carrier signal generating means connected to an outer positioned one of said surface wave transducers; modulation means connected to the other outer positioned surface wave transducer for providing a modulated carrier signal; and terminal means connected to the inner positioned surface wave transducer for receiving the double sideband suppressed carrier signal detected by the inner positioned surface wave transducer.
Claim 2
Dependent Claim
90 words
Apparatus for generating a double sideband suppressed carrier signal comprising: a surface wave propagating medium; three spaced apart surface wave transducers positioned on a surface of said surface wave propagating medium; carrier signal generating means connected to an outer positioned one of said surface wave transducers; modulation means connected to the other outer positioned surface wave transducer for providing a modulated carrier signal; and terminal means connected to the inner positioned surface wave transducer for receiving the double sideband suppressed carrier signal detected by the inner positioned surface wave transducer.
Claim 3
Dependent Claim
42 words
The apparatus according to claim 1 wherein each of said transducers is comprised of a first and a second fingered array of electrodes with the fingers of said first array of electrodes interleaved with the fingers of said second array of electrodes.
Claim 4
Dependent Claim
29 words
The apparatus according to claim 2 wherein the spacing between the finger electrodes corresponds to one-half the acoustic wavelength of the carrier signal from said carrier signal generating means.
Claim 5
Dependent Claim
23 words
The apparatus according to claim 2 wherein the first array of finger electrodes of each of said transducers is connected to circuit ground.
Claim 6
Dependent Claim
30 words
The apparatus according to claim 1 in which the inner positioned surface wave transducer is equally spaced from each of the outer positioned surface wave transducers along a common axis.
Claim 7
Dependent Claim
17 words
The apparatus according to claim 1 in which the modulation means provides an amplitude modulated carrier signal.
Claim 8
Dependent Claim
103 words
Apparatus for generating a double sideband suppressed carrier signal comprising: an acoustic wave propagating medium; a pair of transducer means coupled to said propagating medium for generating acoustic surface waves in opposing directions along a common propagating path in said medium so as to cause a cancellation of common surface waves at an output position along said propagating path; output transducer means positioned at said output position for detecting the non-cancelled portions of said generated acoustic waves; and means for generating a carrier signal and a modulated carrier signal connected to a first and a second of said pair of transducer means, respectively.
Claim 9
Dependent Claim
103 words
Apparatus for generating a double sideband suppressed carrier signal comprising: an acoustic wave propagating medium; a pair of transducer means coupled to said propagating medium for generating acoustic surface waves in opposing directions along a common propagating path in said medium so as to cause a cancellation of common surface waves at an output position along said propagating path; output transducer means positioned at said output position for detecting the non-cancelled portions of said generated acoustic waves; and means for generating a carrier signal and a modulated carrier signal connected to a first and a second of said pair of transducer means, respectively.
Claim 10
Dependent Claim
42 words
The apparatus according to claim 7 wherein each of said transducers is comprised of a first and a second fingered array of electrodes with the fingers of said first array of electrodes interleaved with the fingers of said second array of electrodes.
Claim 11
Dependent Claim
29 words
The apparatus according to claim 8 wherein the spacing between the finger electrodes corresponds to one-half the acoustic wavelength of the carrier signal from said carrier signal generating means.
Claim 12
Dependent Claim
23 words
The apparatus according to claim 8 wherein the first array of finger electrodes of each of said transducers is connected to circuit ground.
Claim 13
Dependent Claim
75 words
Apparatus for generating a double sideband suppressed carrier signal comprising: a piezoelectric substrate; an output transducer disposed on said substrate; a pair of input transducers disposed on said substrate and equally spaced from said output transducer; means for applying a carrier signal and an amplitude modulated carrier signal to a first and a second of said pair of output transducers, respectively; and terminal means connected to said output transducer for receiving the signal generated therein.
Claim 14
Dependent Claim
75 words
Apparatus for generating a double sideband suppressed carrier signal comprising: a piezoelectric substrate; an output transducer disposed on said substrate; a pair of input transducers disposed on said substrate and equally spaced from said output transducer; means for applying a carrier signal and an amplitude modulated carrier signal to a first and a second of said pair of output transducers, respectively; and terminal means connected to said output transducer for receiving the signal generated therein.
Claim 15
Dependent Claim
32 words
The apparatus according to claim 11 wherein each of said transducers is an electro-acoustic surface wave transducer mechanically coupled to said substrate for generating and interacting with acoustic surface-waves on said substrate.
Claim 16
Dependent Claim
42 words
The apparatus according to claim 11 wherein each of said transducers is comprised of a first and a second fingered array of electrodes with the fingers of said first array of electrodes interleaved with the fingers of said second array of electrodes.
Claim 17
Dependent Claim
29 words
The apparatus according to claim 13 wherein the spacing between the finger electrodes corresponds to one-half the acoustic wavelength of the carrier signal from said carrier signal generating means.
Claim 18
Dependent Claim
23 words
The apparatus according to claim 13 wherein the first array of finger electrodes of each of said transducers is connected to circuit ground.
Claim 19
Independent Claim
56 words
A method for generating a double sideband suppressed carrier signal comprising the following steps: generating a first acoustic signal from a carrier signal; generating a second acoustic signal from a modulated carrier signal; combining the first and second acoustic signals; and deriving a double sideband suppressed carrier signal from the combined first and second acoustic signals.
Claim 20
Independent Claim
56 words
A method for generating a double sideband suppressed carrier signal comprising the following steps: generating a first acoustic signal from a carrier signal; generating a second acoustic signal from a modulated carrier signal; combining the first and second acoustic signals; and deriving a double sideband suppressed carrier signal from the combined first and second acoustic signals.
Claim 21
Dependent Claim
23 words
The method according to claim 16 wherein said combining step cancels the common signal components of said first and said second acoustic signal.
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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |