US4644415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic video recording and reproducing apparatus
Assignee: Mitsubishi Electric Corp
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Filing: 1985-05-21
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Granted: 1987-02-17
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Expires: 2005-05-21
Abstract
Abstract A tape travelling drive circuit (25) of a magnetic video recording and reproducing apparatus enables a magnetic tape (1) to travel at a speed approximate to a value {2n±(1/m)} times the travelling speed for recording (n being a positive integer and m being a positive integer excluding 1). A detector (34) detects an output level of a reproduced video signal. If the output level is higher than a predetermined level, the detector (34) stores the reproduced video signal in a storage circuit (35) for a specified period and at the same time provides the signal through a selector (32). If the output level is lower than the predetermined level, the reproduced video signal stored in the storage circuit (35) is read out and provided through the selector (32). Thus, even if the output level is lowered, a picture of good quality with little noise can be reproduced.
Inventors
- 👤 Yoshinori Serizawa
- 👤 Masaharu Hayakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:49
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; G; G11; G11B; G11B27/00; G11B27/005; H04N5/78; H04N5/782; H04N5/783; G11B2220/00; G11B2220/90
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
198 words
A magnetic video recording and reproducing apparatus provided with rotating heads, in which a recording mode, a standard reproduction mode and a high-speed reproduction mode are applied, said magnetic video recording and reproducing apparatus comprising: travelling drive means (25) for enabling a magnetic tape to travel in said high-speed reproduction mode at a speed approximate to a value {2n±(1/m)} times the travelling speed in said recording mode (n being a positive integer and m being a positive integer excluding 1), level detecting means (34) for detecting a level of an information signal reproduced by said rotating magnetic heads, storage means (35) for storing for a predetermined period said information signal reproduced in said high-speed reproduction mode, in response to said level detecting means detecting a level of said information signal higher than a predetermined level, and selection means for providing said information signal reproduced in said high-speed reproduction mode in response to said level detecting means detecting a level of said information signal higher than said predetermined level and for providing said information signal stored in said storage means in response to said level detecting means detecting a level of said information signal lower than said predetermined level.
Claim 2
Dependent Claim
198 words
A magnetic video recording and reproducing apparatus provided with rotating heads, in which a recording mode, a standard reproduction mode and a high-speed reproduction mode are applied, said magnetic video recording and reproducing apparatus comprising: travelling drive means (25) for enabling a magnetic tape to travel in said high-speed reproduction mode at a speed approximate to a value {2n±(1/m)} times the travelling speed in said recording mode (n being a positive integer and m being a positive integer excluding 1), level detecting means (34) for detecting a level of an information signal reproduced by said rotating magnetic heads, storage means (35) for storing for a predetermined period said information signal reproduced in said high-speed reproduction mode, in response to said level detecting means detecting a level of said information signal higher than a predetermined level, and selection means for providing said information signal reproduced in said high-speed reproduction mode in response to said level detecting means detecting a level of said information signal higher than said predetermined level and for providing said information signal stored in said storage means in response to said level detecting means detecting a level of said information signal lower than said predetermined level.
Claim 3
Dependent Claim
32 words
A magnetic video recording and reproducing apparatus in accordance with claim 1, wherein said rotating magnetic heads each have a width smaller than 1/2 of a track pitch in said recording mode.
References Cited (Backward Citations)
JPS5553982A
Cited
US4463390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |