Patent US3825677A successfully refreshed from Google Patents.
US3825677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television scan converter bandwidth reduction device
Assignee: Meritor Inc
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Filing: 1973-03-07
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Granted: 1974-07-23
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Expires: 1993-03-07
Abstract
Abstract A television signal is transmitted over a narrow bandwidth transmission line or recorded over a narrow bandwidth recording device by scan converting the television signal a line at a time from a disc magnetic recorder. Each line of the video signal is loaded at high frequency into a variable delay line or storage element whose electrical length exactly equals a television line; the delay line is then switched to operate at a longer electrical length to convert the television line into a narrow bandwidth signal. Playback is accomplished by loading the low frequency signal into a variable delay line and then operating the delay line at the original, high frequency rate to unload the scan line into a disc magnetic recorder at the original high bandwidth. The video signal is reassembled a line at a time onto the receiver disc magnetic recorder for playing back the original video frame at the original high frequency and bandwidth.
Inventors
- 👤 V Kasprzak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:02
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/12; H04N7/122; H04N5/00; H04N5/76; H04N5/91; H04N5/917; H04N5/919
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
180 words
An apparatus for transmitting television signals over narrow bandwidth channel means, comprising: a. signal source means including means for controllably presenting a pre-recorded television signal one video scan line at a time at normal high frequency bandwidth, b. storage means having selectable high and low speed modes, c. means connecting said signal source means to said storage means, d. means for connecting said storage means to the narrow bandwidth channel means, and e. means controlling said source means and said storage means: i. to read one video scan line at normal, high frequency bandwidth and simultaneously to operate said storage means in high speed mode to load said one scan line into said storage means, and ii. to operate said loaded storage means in low speed mode consistant with the narrow bandwidth of the channel means for presenting the video scan line thereto as a signal of lower bandwidth, said controlling means sequentially controlling said source means and said storage means for presenting an entire video signal to the narrow bandwidth channel means one video scan line at a time.
Claim 2
Independent Claim
180 words
An apparatus for transmitting television signals over narrow bandwidth channel means, comprising: a. signal source means including means for controllably presenting a pre-recorded television signal one video scan line at a time at normal high frequency bandwidth, b. storage means having selectable high and low speed modes, c. means connecting said signal source means to said storage means, d. means for connecting said storage means to the narrow bandwidth channel means, and e. means controlling said source means and said storage means: i. to read one video scan line at normal, high frequency bandwidth and simultaneously to operate said storage means in high speed mode to load said one scan line into said storage means, and ii. to operate said loaded storage means in low speed mode consistant with the narrow bandwidth of the channel means for presenting the video scan line thereto as a signal of lower bandwidth, said controlling means sequentially controlling said source means and said storage means for presenting an entire video signal to the narrow bandwidth channel means one video scan line at a time.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1 wherein said signal source means includes a disc magnetic recorder.
Claim 4
Dependent Claim
18 words
The apparatus of claim 1 wherein said means for connecting to the channel means includes an FM modulator.
Claim 5
Independent Claim
185 words
An apparatus for receiving television signals from narrow bandwidth channel means, comprising: a. signal reconstruction means including means for controllably recording a television signal one video scan line at a time at normal high frequency bandwidth, b. storage means having selectable high and low speed modes, c. means connecting said signal reconstruction means to said storage means, d. means for connecting said storage means to the narrow bandwidth channel means, and e. means controlling said reconstruction means and said storage means, i. to operate said storage means in low speed mode consistant with the narrow bandwidth of the channel means for loading a video scan line received therefrom as a signal of lower bandwidth, and ii. to operate said storage means and said signal reconstruction means simultaneously in normal, higH speed mode to record said one scan line from said storage means into said signal reconstruction means as a signal of high bandwidth, said controlling means sequentially controlling said reconstruction means and said storage means for reconstructing an entire video signal received from the narrow bandwidth channel means one video scan line at a time.
Claim 6
Independent Claim
185 words
An apparatus for receiving television signals from narrow bandwidth channel means, comprising: a. signal reconstruction means including means for controllably recording a television signal one video scan line at a time at normal high frequency bandwidth, b. storage means having selectable high and low speed modes, c. means connecting said signal reconstruction means to said storage means, d. means for connecting said storage means to the narrow bandwidth channel means, and e. means controlling said reconstruction means and said storage means, i. to operate said storage means in low speed mode consistant with the narrow bandwidth of the channel means for loading a video scan line received therefrom as a signal of lower bandwidth, and ii. to operate said storage means and said signal reconstruction means simultaneously in normal, higH speed mode to record said one scan line from said storage means into said signal reconstruction means as a signal of high bandwidth, said controlling means sequentially controlling said reconstruction means and said storage means for reconstructing an entire video signal received from the narrow bandwidth channel means one video scan line at a time.
Claim 7
Dependent Claim
15 words
The apparatus of claim 4 wherein said signal reconstruction means includes a disc magnetic recorder.
Claim 8
Dependent Claim
18 words
The apparatus of claim 4 wherein said means for connecting to the channel means includes an FM demodulator.
Claim 9
Independent Claim
108 words
The method of transmitting a television signal over a narrow bandwidth channel means, comprising: a. loading a single scan line of the television signal at normal, high frequency into a storage means having selectable high and low speed modes, b. operating the storage means at high speed mode during said loading, c. operating the loaded storage means at low speed mode consistent with the narrow bandwidth of the channel means for presenting the video scan line thereto as a signal of lower bandwidth, and d. repeating the foregoing steps to present an entire video signal to the narrow bandwidth channel means one video scan line at a time.
Claim 10
Independent Claim
108 words
The method of transmitting a television signal over a narrow bandwidth channel means, comprising: a. loading a single scan line of the television signal at normal, high frequency into a storage means having selectable high and low speed modes, b. operating the storage means at high speed mode during said loading, c. operating the loaded storage means at low speed mode consistent with the narrow bandwidth of the channel means for presenting the video scan line thereto as a signal of lower bandwidth, and d. repeating the foregoing steps to present an entire video signal to the narrow bandwidth channel means one video scan line at a time.
Claim 11
Independent Claim
97 words
The method of receiving a television signal from a narrow bandwidth channel means, comprising: a. loading a single, lower bandwidth scan line of the television signal into a storage means having selectable high and low speed modes, b. operating the storage means at low speed mode during said loading, c. operating the loaded storage means at high speed mode to reproduce the scan line therefrom as a signal of normal, high bandwidth, and d. repeating the foregoing steps to reconstruct an entire video signal from the narrow bandwidth channel means one video scan line at a time.
Claim 12
Independent Claim
97 words
The method of receiving a television signal from a narrow bandwidth channel means, comprising: a. loading a single, lower bandwidth scan line of the television signal into a storage means having selectable high and low speed modes, b. operating the storage means at low speed mode during said loading, c. operating the loaded storage means at high speed mode to reproduce the scan line therefrom as a signal of normal, high bandwidth, and d. repeating the foregoing steps to reconstruct an entire video signal from the narrow bandwidth channel means one video scan line at a time.
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |