US3659042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide deviation magnetic recording techniques
Assignee: Westinghouse Electric Corp
•
Filing: 1969-10-06
•
Granted: 1972-04-25
•
Expires: 1989-10-06
Abstract
Abstract A method and apparatus for recording on recording media, having a predetermined bandwidth, composite video signals including video, blanking and synchronizing portions and having a predetermined frequency spectrum wherein the composite video signals are frequency modulated on a carrier frequency which has a value near to the upper frequency limit of the predetermined frequency spectrum so that the blanking portion of the composite video signal produces the carrier frequency, modulated signals of frequencies lower than the carrier frequency extending into the predetermined frequency spectrum are produced in response to the synchronizing portion and modulated signals having frequencies higher than the carrier frequency are produced in response to the video portion, with the maximum deviation of the carrier frequency being greater than the predetermined frequency spectrum.
Inventors
- 👤 Paul G Kennedy
- 👤 Raymond W Mackenzie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:22
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A method of recording on recording media having a predetermined bandwidth comprising video signals including video, blanking and synchronizing portions and having a predetermined frequency spectrum comprising the steps of: frequency modulating said composite video signals on a carrier frequency having a value near to the upper frequency limit of said predetermined frequency spectrum so that said carrier frequency is produced in response to said blanking portions of said composite video signals, said synchronizing portions providing modulated signals of frequencies lower than said carrier frequency extending into said predetermined frequency spectrum and said video portions producing modulated signals having frequencies higher than said carrier frequency; and recording said modulated signals on said recording media.
Claim 2
Independent Claim
114 words
A method of recording on recording media having a predetermined bandwidth comprising video signals including video, blanking and synchronizing portions and having a predetermined frequency spectrum comprising the steps of: frequency modulating said composite video signals on a carrier frequency having a value near to the upper frequency limit of said predetermined frequency spectrum so that said carrier frequency is produced in response to said blanking portions of said composite video signals, said synchronizing portions providing modulated signals of frequencies lower than said carrier frequency extending into said predetermined frequency spectrum and said video portions producing modulated signals having frequencies higher than said carrier frequency; and recording said modulated signals on said recording media.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein: the maximum deviation of said carriEr frequency exceeds said predetermined frequency spectrum.
Claim 4
Dependent Claim
43 words
The method of claim 1 wherein: said modulated signals which are produced in response to said video portions of said composite video signals have frequencies between said upper frequency limit of said frequency spectrum and the upper frequency limit of said predetermined bandwidth.
Claim 5
Dependent Claim
44 words
The method of claim 1 includes reproducing the recording and comprises the steps of: sensing the recorded signals on said recording media and providing sensed frequency modulated signals indicative thereof; and frequency demodulating said sensed frequency modulated signals to reconstruct said composite video signals.
Claim 6
Dependent Claim
104 words
In apparatus for recording on recording media having a predetermined bandwidth composite video signals including video, synchronizing and blanking portions and having a predetermined frequency spectrum, the combination of: means for frequency modulating a carrier frequency with said composite video signals so that said carrier frequency is produced in response to said blanking portions of said composite video signals, said synchronizing portions provide modulated signals of frequency lower than said carrier frequency extending into said predetermined frequency spectrum and said video portions produce modulated signals having frequencies higher than said carrier frequency; and recording means for recording said modulated signals on said recording media.
Claim 7
Dependent Claim
104 words
In apparatus for recording on recording media having a predetermined bandwidth composite video signals including video, synchronizing and blanking portions and having a predetermined frequency spectrum, the combination of: means for frequency modulating a carrier frequency with said composite video signals so that said carrier frequency is produced in response to said blanking portions of said composite video signals, said synchronizing portions provide modulated signals of frequency lower than said carrier frequency extending into said predetermined frequency spectrum and said video portions produce modulated signals having frequencies higher than said carrier frequency; and recording means for recording said modulated signals on said recording media.
Claim 8
Dependent Claim
35 words
The combination of claim 5 includes: means for clamping said blanking portion of said composite video signals to a reference level and applying said composite video signals so clamped to said means for frequency modulating.
Claim 9
Dependent Claim
54 words
The combination of claim 5 wherein: the maximum deviation of said carrier frequency exceeds said predetermined frequency spectrum and said modulated signals produced in response to said video portions of said composite video signals have frequencies between said upper frequency limit of said frequency spectrum and the upper frequency limit of said predetermined bandwidth.
Claim 10
Dependent Claim
48 words
The combination of claim 7 includes reproducing apparatus for reproducing said recording and comprises: means for sensing the recorded signals on said recording media and providing sensed frequency modulated signals indicative thereof; and means for frequency demodulating said sensed frequency modulated signals to reconstruct said composite video signals.
References Cited (Backward Citations)
US3188615A
Cited
US3350504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |