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US 6,519,409 B1Granted
Apparatus for recording a high quality signal
AssigneeVictor Company of Japan, Ltd.
InventorKanju Ishii
Life of this patent
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Abstract
In a magnetic recording apparatus, an input video signal is processed into a processing-resultant video signal having a first given frequency band. The processing-resultant video signal is recorded on a standard magnetic tape which is designed to record a standard-format video signal having a second given frequency band narrower than the first given frequency band.
Claims10
A magnetic recording apparatus comprising:
- first means for recording a video signal of a first standard format, which has a first luminance frequency band, on a magnetic tape of a first standard type designed to record a video signal of the first standard format during a standard operation anode;
- second means for recording a video signal of a second standard format, which has a second luminance frequency band wider than the first luminance frequency band, on a magnetic tape of a second standard type designed to record a video signal of the second standard format during a true high-quality operation mode;
- third means for recording a video signal of a high-quality format, which has a third luminance frequency band equal to the second luminance frequency band, on a magnetic tape of the first standard type during a quasi high-quality operation mode;
- a preemphasis circuit for emphasizing high-frequency components of a first luminance signal in an input video signal to generate a second luminance signal;
- an FM modulation circuit for modulating a frequency of a carrier in accordance with the second luminance signal to generate a third luminance signal, the third luminance signal being an FM modulation luminance signal;
- an adder for multiplexing the FM modulation luminance signal and a chrominance signal in the input video signal into a record signal on a frequency multiplexing basis;
- and
- a recording circuit for recording the record signal on a recording tape;
- wherein a degree of emphasizing by the preemphasis circuit during the quasi high-quality operation mode is lower, by an emphasis difference quantity, than that during the standard operation mode and the true high-quality operation mode concerning signal components having frequencies of at least 1 MHz or higher, and the emphasis difference quantity increases as a signal frequency rises, and wherein a frequency deviation provided by the FM modulation circuit during the quasi high-quality operation mode is greater than that during the standard operation mode and is equal to that during the true high-quality operation mode.
6 more elements
Dependencies are inferred from the claim text.