Claims
- 1. In a magnetic recording apparatus, the improvement comprising:
- a line noise canceling means;
- detection means for detecting an envelope level of a component of a first portion of a video signal reproduced from a recording medium, wherein said envelope level indicates a grade quality of said recording medium;
- said line noise canceling means being rendered inoperable when said envelope level detected by said detection means is higher than a predetermined envelope level;
- said line noise canceling means, when said envelope level detected by said detection means is less than or equal to said predetermined envelope level, delaying a luminance signal of said first portion of said video signal for a single horizontal scanning period to provide a delayed luminance signal, subtracting the delayed luminance signal from a non-delayed luminance signal of a second portion of said video signal reproduced from the recording medium to provide a first subtraction result signal, extracting a signal whose amplitude does not exceed a predetermined value from the first subtraction result signal constituting a noise component in said non-delayed luminance signal, and subtracting said signal whose amplitude does not exceed the predetermined value from the non-delayed luminance signal to output a luminance signal having the noise component canceled therefrom.
- 2. An improvement in a magnetic recording apparatus as in claim 1, wherein said envelope first portion includes a reproduced FM luminance signal of said video signal.
- 3. An improvement in a magnetic recording apparatus as in claim 1, further comprising:
- reproducing means for reproducing FM luminance signals of said first portion of said video signal and said second portion of said video signal; and
- demodulating means for frequency demodulating said FM luminance signals to obtain said luminance signal of said first portion of said video signal and said luminance signal of said second portion of said video signal.
Priority Claims (5)
Number |
Date |
Country |
Kind |
2-175131 |
Jul 1990 |
JPX |
|
2-176593 |
Jul 1990 |
JPX |
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2-183198 |
Jul 1990 |
JPX |
|
2-184918 |
Jul 1990 |
JPX |
|
2-194613 |
Jul 1990 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/944,900, filed Sep. 15, 1992, now abandoned, which is a division of application Ser. No. 07/721,349, filed Jun. 28, 1991 (U.S. Pat. No. 5,257,109 issued Oct. 26, 1993).
US Referenced Citations (15)
Foreign Referenced Citations (10)
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EPX |
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EPX |
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EPX |
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DEX |
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Jan 1984 |
JPX |
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Oct 1984 |
JPX |
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Mar 1988 |
JPX |
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Jun 1988 |
JPX |
64-14178 |
Jan 1989 |
JPX |
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GBX |
Non-Patent Literature Citations (1)
Entry |
T. Bannai, et al, "Wide Band Video Signal Recorder Having Level and Linearity Corrector," IEEE Transactions on Consumer Electronics, vol. CE-32, No. 3, pp. 268-273, Aug. 1986. |
Divisions (1)
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Number |
Date |
Country |
Parent |
721349 |
Jun 1991 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
944900 |
Sep 1992 |
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