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| Method and apparatus for automatic optical recognition of road signs |
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| Compact electronic device |
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| Apparatus for adjusting operating conditions of a cathode ray tube |
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| Method and apparatus for digital television error correction without overhead bits |
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| Generating half-tone representations |
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| Ink jet color graphics printing |
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| Video signal recording system and picture display system in a high-definition television system |
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| Image communication apparatus |
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Recording and reproducing apparatus for recording and reproducing a carrier chrominance signal with pre-emphasis and de-emphasis
| Details |
Inventors: Hirota, Akira; Tsushima, Takuya; Suzuki, Nobuyoshi;
Assignee: Victor Company of Japan, Ltd. (Yokohama, JP)
Primary Examiner: Richardson; Robert L.
Assistant Examiner:
Attorney, Agent or Firm: Meller; Michael N.
A recording and reproducing apparatus for recording a carrier chrominance signal, comprises a separating circuit for separating a carrier chrominance signal from a color video signal, a recording signal processing circuit for converting the carrier chrominance signal into a carrier chrominance signal having a signal format suited for recording and reproduction, a recording circuit for recording an output signal of the recording signal processing circuit on a recording medium, a reproducing circuit for reproducing the recorded signal from the recording medium, a reproduced signal processing circuit for converting the reproduced signal from the reproducing circuit into a reproduced carrier chrominance signal having an original signal format, and a de-emphasis circuit responsive to the reproduced carrier chrominance signal from the reproduced signal processing circuit, for subjecting the reproduced carrier chrominance signal to a de-emphasis so that a high-frequency component in a vertical spatial frequency of the reproduced carrier chrominance signal is relatively attenuated compared to a low-frequency component of the reproduced carrier chrominance signal. |
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DETAILED DESCRIPTION Accordingly, it is a general object of the present invention to provide a novel and useful recording and reproducing apparatus for recording and reproducing a carrier chrominance signal, in which the problem described before is eliminated.
Another and more specific object of the present invention is to provide a recording and reproducing apparatus which records on a recording medium an output carrier chrominance signal of a pre-emphasis circuit which has a linear pre-emphasis characteristic for relatively emphasizing the level of a high-frequency component in a vertical spatial frequency of a carrier chrominance signal compared to a low-frequency component, and obtains a reproduced carrier chrominance signal at the time of the reproduction by passing a reproduced carrier chrominance signal which is reproduced from the recording medium through a de-emphasis circuit which has a linear de-emphasis characteristic complementary to the linear pre-emphasis characteristic of the pre-emphasis circuit.
By "linear emphasis", it means that the pre-emphasis or de-emphasis is performed with respect to the carrier chrominance signal with the same pre-emphasis or de-emphasis characteristic regardless of the level of the carrier chrominance signal.
According to the recording and reproducing apparatus of the present invention, it is possible to improve the signal-to-noise (S/N) ratio of the reproduced carrier chrominance signal, because the de-emphasis is performed at the time of the reproduction with respect to the vertical spatial frequency of the reproduced carrier chrominance signal.
In addition, since the carrier chrominance signal which is reproduced, is a carrier chrominance signal which is passed through the pre-emphasis circuit having the pre-emphasis characteristic complementary to the de-emphasis characteristic of the de-emphasis circuit so that the level of the high-frequency component in the vertical spatial frequency of the carrier chrominance signal is emphasized before being recorded, the vertical spatial frequency characteristic (vertical resolution) will not be deteriorated due to the de-emphasis as in the case of the conventional noise reduction circuit which uses the line correlation
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Image Analysis 
