Patent ID: 6393194
Filing Date: 2002-05-21
Classification: G11B,H04N

Abstract:
A magnetic recording and reproducing 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 mode; 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; fourth means for reproducing a video signal of the first standard format which has been recorded in the standard operation mode from a magnetic tape of the first standard type; fifth means for reproducing a video signal of the second standard format which has been recorded in the high-quality operation mode from a magnetic tape of the second standard type; and sixth means for reproducing a video signal of the high-quality format which has been recorded in the quasi high-quality operation mode from a magnetic tape of the first standard type; the magnetic recording and reproducing apparatus further comprising: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 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; a recording circuit for recording the record signal on a recording tape; a reproducing circuit for reproducing a record signal from a recording tape to generate a reproduced signal; an FM demodulation circuit for demodulating an FM modulation luminance signal being a fourth luminance signal in the reproduced signal to generate a fifth luminance signal; and a de-emphasis circuit for de-emphasizing high-frequency components of the fifth luminance signal to generate a sixth luminance signal; 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.