US4091422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for selectively transmitting television images from a plurality of cameras to a monitor
Assignee: Individual
•
Filing: 1976-12-08
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Granted: 1978-05-23
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Expires: 1996-12-08
Abstract
Abstract A system for selectively transmitting television images includes a plurality of television cameras for generating image signals. The cameras may be placed at different respective locations, and at least a single television monitor-receiver is provided for selectively receiving and monitoring one of the image signals. The monitor-receiver includes a circuit for generating common line and field synchronizing signals for the cameras, and an activation-signal generating circuit for supplying activation signals for the cameras, respectively. The activation and synchronizing signals are transmitted to the cameras, respectively, by cable or radio-frequency.
Inventors
- 👤 Gerald Amster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:51
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N5/06; H04N5/067; H04N5/073; H04N5/0733
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
109 words
A system for selectively transmitting television images including video signals comprising: a plurality of television cameras for generating image signals, said cameras being placeable at different respective locations; and at least a single television receiver for selectively receiving and monitoring one of said image signals, said receiver including means for generating common line and field synchronizing signals for said cameras, and activation-signal generating-means for generating activation signals for said cameras, respectively, said activation signals and said synchronizing signals being transmittable to said cameras, respectively, as electronic signals via transmission means a camera being selectively activated by an activation signal transmitted from said activation-signal generating means to the selected camera.
Claim 2
Independent Claim
109 words
A system for selectively transmitting television images including video signals comprising: a plurality of television cameras for generating image signals, said cameras being placeable at different respective locations; and at least a single television receiver for selectively receiving and monitoring one of said image signals, said receiver including means for generating common line and field synchronizing signals for said cameras, and activation-signal generating-means for generating activation signals for said cameras, respectively, said activation signals and said synchronizing signals being transmittable to said cameras, respectively, as electronic signals via transmission means a camera being selectively activated by an activation signal transmitted from said activation-signal generating means to the selected camera.
Claim 3
Dependent Claim
38 words
A system according to claim 1 wherein each of said cameras includes a radio-frequency transceiver, and said receiver includes a radio-frequency transmitter for transmitting said synchronizing signals to said transceivers, and wherein the transmission means is the ether.
Claim 4
Dependent Claim
98 words
A system according to claim 2 wherein said activation-signal generating means comprise pulse-generating means for generating said activation signals and for transmitting said activation signals through said transmitter to said transceivers, wherein said radio-frequency transmitter includes means for synchronizing signals to form composite signals for transmission to said transceivers, the multiplexing of said activation signals being performed at a rate of one line scan signal per activation signal per field of image information, and wherein each of said transceivers includes means for separating and decoding a pre-determined activation signal present in each composite signal received at said transceiver.
Claim 5
Dependent Claim
33 words
A system according to claim 2 wherein each of said cameras is repositionable in azimuth and elevation to respective predetermined angles by command signals, and wherein said activation signals include the command signals.
Claim 6
Dependent Claim
23 words
A system according to claim 2, wherein the activation signal generating means are tone-generator means, and wherein the decoding means are tone-decoding means.
Claim 7
Independent Claim
211 words
A system for selectively transmitting television images including video signals comprising: a plurality of television cameras for generating image signals, said cameras being placeable at different respective locations; and at least a single television receiver for selectively receiving and monitoring one of said image signals, said receiver including means for generating common line and field synchronizing signals for said cameras, and activation-signal generating-means for generating activation signals for said cameras, respectively, said identifying signals and said synchronizing signals being transmittable to said cameras, respectively, as electronic signals via transmission means, said cameras including a radio-frequency transceiver, and said receiver includes a radio-frequency transmitter for transmitting said synchronizing signals to said transceivers, and wherein the transmission means is the ether, said activation signal generating means comprising pulse-generating means for generating said activation signals and for transmitting said activation signals through said transmitter to said transceivers, wherein said radio-frequency transmitter includes means for synchronizing signals to form composite signals for transmission to said transceivers, the multiplexing of said activation signals being performed at a rate of one line scan signal per activation signal per field of image information, and wherein each of said transceivers includes means for separating and decoding a pre-determined activation signal present in each composite signal received at said transceiver.
Claim 8
Independent Claim
211 words
A system for selectively transmitting television images including video signals comprising: a plurality of television cameras for generating image signals, said cameras being placeable at different respective locations; and at least a single television receiver for selectively receiving and monitoring one of said image signals, said receiver including means for generating common line and field synchronizing signals for said cameras, and activation-signal generating-means for generating activation signals for said cameras, respectively, said identifying signals and said synchronizing signals being transmittable to said cameras, respectively, as electronic signals via transmission means, said cameras including a radio-frequency transceiver, and said receiver includes a radio-frequency transmitter for transmitting said synchronizing signals to said transceivers, and wherein the transmission means is the ether, said activation signal generating means comprising pulse-generating means for generating said activation signals and for transmitting said activation signals through said transmitter to said transceivers, wherein said radio-frequency transmitter includes means for synchronizing signals to form composite signals for transmission to said transceivers, the multiplexing of said activation signals being performed at a rate of one line scan signal per activation signal per field of image information, and wherein each of said transceivers includes means for separating and decoding a pre-determined activation signal present in each composite signal received at said transceiver.
Claim 9
Dependent Claim
137 words
A system according to claim 6 wherein said radio-frequency transmitter includes a first modulator for modulating said radio-frequency transmitter up to a 100% modulation depth by said synchronizing signals, wherein each of said radio-frequency transceivers includes a second modulator for modulating the transmitter portion of the transceiver by the composite signals, only one of the transmitter portions of said transceivers being activatable at a time, said activation signals being generatable during the field synchronizing signals, the transmitter portions of said transceivers being blankable during said field synchronizing signals when said transceivers are separated from said receiver by a distance relatively short compared to the distance covered by radio-frequency propagation during each of the synchronizing signals, whereby a common radio frequency carrier is usable by said radio-frequency transmitter and the transmitter portion of each of said transceivers, respectively.
References Cited (Backward Citations)
US3258531A
Cited
US3437753A
Cited
USPTO Annuity & Maintenance Windows
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|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |