US4296430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording with reduced cross-talk and interchannel time displacement
Assignee: RCA Licensing Corp
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Filing: 1979-10-12
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Granted: 1981-10-20
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Expires: 1999-10-12
Abstract
Abstract A multichannel recorder, such as for color video, reduces the width of recording heads that record low frequencies, and interchanges the order of one such head with a high frequency head. This both reduces crosstalk and keeps interchannel time displacement low.
Inventors
- 👤 Henry R. Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:14
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/008; G11B5/00813; G11B5/00847; G11B5/0086; G11B5/00865; G11B5/00873; G11B5/48; G11B5/52; G11B5/53; G11B5/531; G11B5/534; H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/782; H04N5/7824; H04N5/7826; H04N5/78263; H04N9/00; H04N9/79; H04N9/80; H04N9/82; H04N9/825
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
137 words
A magnetic head device for recording on magnetic tape, said device comprising a rotating drum, two pairs of magnetic heads, each pair comprising a wide width head for recording high frequency information and a narrow width head for recording low frequency information, each of said pairs having a gap between the heads comprising the pair, the order of the high and low frequency heads within one of said pairs being reversed with respect to the order of the high and low frequency heads of the remaining pair, said pairs being mounted on said drum to provide that the recording tracks laid down on the tape by the low frequency heads have a guardband therebetween of the sum of the amounts by which the narrow heads differ in widths from the wide heads of the same pair respectively.
Claim 2
Dependent Claim
137 words
A magnetic head device for recording on magnetic tape, said device comprising a rotating drum, two pairs of magnetic heads, each pair comprising a wide width head for recording high frequency information and a narrow width head for recording low frequency information, each of said pairs having a gap between the heads comprising the pair, the order of the high and low frequency heads within one of said pairs being reversed with respect to the order of the high and low frequency heads of the remaining pair, said pairs being mounted on said drum to provide that the recording tracks laid down on the tape by the low frequency heads have a guardband therebetween of the sum of the amounts by which the narrow heads differ in widths from the wide heads of the same pair respectively.
Claim 3
Dependent Claim
38 words
A device as claimed in claim 1, wherein the heads within each of said pairs have the same azimuth angle, the azimuth angle of one pair of heads being opposite with respect to that of the other pair.
Claim 4
Dependent Claim
20 words
A device as claimed in claim 1, wherein said pairs are mounted one hundred eighty degrees apart on said drum.
Claim 5
Dependent Claim
25 words
A device as claimed in claim 1, wherein said wide heads record a television luminance signal, and said narrow heads record a television chrominance 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) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |