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US3842199A
Expired / Lapsed
US
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Telephone image transmission system
Assignee: RCA Corp
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Filing: 1972-05-26
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Granted: 1974-10-15
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Expires: 1992-05-26
Abstract
Abstract A system capable of transmitting still television pictures of three-dimensional objects over communications channels such as long-distance unequalized voice-grade telephone lines is described, and in which distortion in a reproduced image due to adjacent sample interference is reduced by transmitting such samples at a rate reduced from the normal 60Hz vertical driving rate so successively transmitted samples will appear geographically adjacent in the picture display.
Inventors
- 👤 J Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:11
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/12; H04N7/122; H04N7/125
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
206 words
An image transmission system comprising: first means for generating video signal information representative of an object scene scanned under the control of applied line and field rate deflection signaLs; an audio frequency communications link having a predetermined bandwidth and accommodating a given signal sampling rate less than said line scanning rate; second means coupled to an input of said communications link for generating frequency modulated signals over a range of frequencies within the bandwidth of said link; third means for applying said video signal information into said generator means at a rate comparable to said signal sampling rate for converting successive video samples to frequency modulated audio frequency signals to be transmitted by said communications link from one location to another location; and fourth means for receiving said sample transmissions for reproduction by an image display device, also controlled by line and field rate deflection signals; with said third means including means to reduce the rate of field control deflection signals in generating said video signal information by one-half the ratio between said given signal sampling and line scanning rates, in transmitting successive samples of said video signal information via said generator means and said audio frequency communications link from said first to said other location.
Claim 2
Dependent Claim
206 words
An image transmission system comprising: first means for generating video signal information representative of an object scene scanned under the control of applied line and field rate deflection signaLs; an audio frequency communications link having a predetermined bandwidth and accommodating a given signal sampling rate less than said line scanning rate; second means coupled to an input of said communications link for generating frequency modulated signals over a range of frequencies within the bandwidth of said link; third means for applying said video signal information into said generator means at a rate comparable to said signal sampling rate for converting successive video samples to frequency modulated audio frequency signals to be transmitted by said communications link from one location to another location; and fourth means for receiving said sample transmissions for reproduction by an image display device, also controlled by line and field rate deflection signals; with said third means including means to reduce the rate of field control deflection signals in generating said video signal information by one-half the ratio between said given signal sampling and line scanning rates, in transmitting successive samples of said video signal information via said generator means and said audio frequency communications link from said first to said other location.
Claim 3
Dependent Claim
74 words
The system of claim 1 wherein said audio frequency communications link includes an unequalized telephone communications line through which frequency modulated audio frequency signals are transmitted at a signal sampling rate substantially twice its bandwidth and 1/8 said line scanning rate and wherein said third means channels successive samples of said video signal information via said generator means to said communications link at substantially 1/16 the field scanning rate of said image display device.
Claim 4
Dependent Claim
60 words
The system of claim 1 wherein said first means includes an image pickup for scanning a relatively stationary object scene for conversion to video signal information representative thereof and wherein said third means controls the field deflection rate of said pickup device scanning to substantially that rate which is less than the field scanning rate of said image display device.
Claim 5
Dependent Claim
43 words
The system of claim 1 wherein said generation of video signal information representative of an object scene and the reproduction of said information by said image display device are each regulated by said third means to have substantially the same horizontal scanning rate.
Claim 6
Dependent Claim
38 words
The system of claim 1 wherein said third means channels successive samples of video signal information to said fourth means at a rate such that said successive samples appear substantially geographically adjacent one another in the reproduced image.
Claim 7
Dependent Claim
35 words
The system of claim 1 wherein said audio frequency communications link includes an unequalized telephone communications line through which frequency modulated audio frequency signals are transmitted at a signal sampling rate substantially twice its bandwidth.
Claim 8
Dependent Claim
69 words
The system of claim 1 wherein said fourth means includes an information storage unit coupled to said image display device, wherein said storage unit provides stored information signals to said display device at its said field scanning rate, and wherein said third means channels successive samples of video information to be stored in said storage unit at a rate less than said field scanning rate of said display device.
Claim 9
Dependent Claim
78 words
The system of claim 7 wherein said first means includes an image pickup device for scanning a relatively moving object scene for conversion to video signal information representative thereof and a second information storage unit for the recording of said video signal information, and wherein said third means applies said video information to the information storage unit of said second means at substantially that rate which is less than the field scanning rate of said image display device.
References Cited (Backward Citations)
US2895005A
Cited
US3061670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |