公开(公告)号：EP0227210B1

公开(公告)日：1990-06-13

申请号：EP86306581.9

申请日：1986-08-26

申请人： VICTOR COMPANY OF JAPAN, LIMITED

发明人： Kido, Koichi ,  Shibayama, Kenji ,  Tsuruta, Masahiko ,  Hirota, Akira ,  Mihara, Masato ,  Inoue, Osamu

IPC分类号： H04N9/82

CPC分类号： H04N5/78263 ,  H04N5/78213 ,  H04N9/7921 ,  H04N9/7936 ,  H04N9/802 ,  H04N9/8222 ,  H04N9/8255 ,  H04N9/835 ,  H04N9/86

公开(公告)号：EP0227210A1

公开(公告)日：1987-07-01

申请号：EP86306581.9

申请日：1986-08-26

申请人： VICTOR COMPANY OF JAPAN, LIMITED

发明人： Kido, Koichi ,  Shibayama, Kenji ,  Tsuruta, Masahiko ,  Hirota, Akira ,  Mihara, Masato ,  Inoue, Osamu

IPC分类号： H04N9/82

CPC分类号： H04N5/78263 ,  H04N5/78213 ,  H04N9/7921 ,  H04N9/7936 ,  H04N9/802 ,  H04N9/8222 ,  H04N9/8255 ,  H04N9/835 ,  H04N9/86

摘要： A magnetic recording apparatus for carrying out a recording by selectively using one of two kinds of recording systems comprises first through fourth rotary magnetic heads (H S1 , 74a, H SA ; H S2 , 74b, H SB ; H L1 , 9la, H LA ; H L2 ,9lb, H LB ), a first circuit (l7, 73) for producing an FM luminance signal, second and third circuits (20-32, 78-90, l46, l47; 35, 93-99) for producing first and second frequency division multiplexed signals, and a switching circuit (l9, 34, 36; 100, l0l; 138, l39). The first and second heads (H S1 , H S2 ; 74a, 74b; H SA , H SB ) are mounted on a rotary body at mutually opposing positions, and have same height position. The third and fourth heads (H L1 , H L2 ; 9la, 9lb; H LA , H LB ) are mounted on the rotary body at mutually opposing positons respectively in vicinities of the first and second heads along a rotating direction of the rotary body, and have the same height position. The switching circuit selectively supplies the output signals of the first and second circuits to the first through fourth heads when a luminance/color separation recording system is selected as the recording system, and selectively supplies the output signal of the third circuit to the first and second heads or to the third and fourth heads when a low band conversion color recording system is selected as the recording system.

公开(公告)号：EP0133047A3

公开(公告)日：1987-05-06

申请号：EP84305184

申请日：1984-07-30

申请人： VICTOR COMPANY OF JAPAN, LIMITED

发明人： Hirota, Akira ,  Tsushima, Takuya ,  Suzuki, Nobuyoshi

IPC分类号： H04N09/79

CPC分类号： H04N9/7936

摘要： @ A recording and reproducing apparatus for recording a carrier chrominance signal, comprises a separating circuit (13) 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 (16), a recording circuit (17) for recording an output signal of the recording signal processing circuit on a recording medium (19a), a reproducing circuit (21) for reproducing the recorded signal from the recording medium (196), a reproduced signal processing (25) 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 (26) 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.

公开(公告)号：EP0145376A3

公开(公告)日：1986-06-04

申请号：EP84308089

申请日：1984-11-21

申请人： VICTOR COMPANY OF JAPAN, LIMITED

发明人： Hirota, Akira

IPC分类号： H04N09/84

CPC分类号： H04N9/84 ,  H04N9/831

摘要： @ A carrier chrominance signal recording apparatus comprises a first circuit (12, 14) for sampling a carrier chrominance signal at a sampling frequency which is four times a chrominance subcarrier frequency, and then quantizing the sampled signal so as to produce a first digital color signal, a second circuit (15) for subjecting the first digital color signal to a phase shift process so as to produce a second digital color signal related to a carrier chrominance signal in which the phase of a chrominance subcarrier is equivalently and successively shifted by approximately 90° in a predetermined direction for every one horizontal scanning period, a third circuit (16, 17) for converting the output second digital color signal of the second circuit into a frequency converted digital color signal which is in a low-frequency range, a circuit (19) for obtaining an analog frequency converted carrier chrominance signal by subjecting the frequency converted digital color signal to a digital-to-analog conversion, and a circuit (21, 22) for recording the analog frequency converted carrier chrominance signal on a recording medium (23). A reproducing apparatus reproduces the signals recorded on the recording medium by the above recording apparatus.

公开(公告)号：EP0133047A2

公开(公告)日：1985-02-13

申请号：EP84305184.8

申请日：1984-07-30

申请人： VICTOR COMPANY OF JAPAN, LIMITED

发明人： Hirota, Akira ,  Tsushima, Takuya ,  Suzuki, Nobuyoshi

IPC分类号： H04N9/79

CPC分类号： H04N9/7936

摘要： @ A recording and reproducing apparatus for recording a carrier chrominance signal, comprises a separating circuit (13) 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 (16), a recording circuit (17) for recording an output signal of the recording signal processing circuit on a recording medium (19a), a reproducing circuit (21) for reproducing the recorded signal from the recording medium (196), a reproduced signal processing (25) 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 (26) 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.