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公开(公告)号：EP0387804A3
公开(公告)日：1991-12-27
申请号：EP90104745.6
申请日：1990-03-13
发明人： Ichinoi, Yutaka , Hirota, Akira , Watanabe, Noboru
摘要： An apparatus for producing a frequency-multiplex signal on the basis of a plurlaity of signals so as to record the produced frequency-multiplex signal on a recording medium, second signal having a frequency lower than that of the first signal. The apparatus includes a multiplying circuit for multiplying the frequency of the second signal by 2 and an amplitude-modulator for multiplying the first signal by the output signal of the multiplying circuit. Also included in the apparatus is an adder for adding the second signal to the output signal of the amplitude-modulator, the output signal of the adder being recorded as the frequency-multiplexing signal on the recording medium.
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公开(公告)号：EP0145376B1
公开(公告)日：1989-06-07
申请号：EP84308089.6
申请日：1984-11-21
发明人： Hirota, Akira
IPC分类号： H04N9/84
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公开(公告)号：EP0133048A3
公开(公告)日：1987-05-20
申请号：EP84305185
申请日：1984-07-30
发明人： Hirota, Akira , Tsushima, Takuya
IPC分类号： H04N05/92
CPC分类号： H04N5/923
摘要： A noise reducing system for video signal, comprises a vertical pre-emphasis circuit (13) supplied with an input video signal which is to be transmitted, for pre-emphasizing the input video signal and transmitting a pre-emphasized video signal to a transmitting system, and a vertical de-emphasis circuit (19) supplied with a pre-emphasized video signal which is pre-emphasized by the vertical pre-emphasis circuit and is transmitted through the transmitting system (14-18), for de-emphasizingthe pre-emphasized video signal. The vertical pre-emphasis circuit has a non-linear pre-emphasis characteristic for relatively emphasizing a high-frequency component of the input video signal in a vertical spatial frequency of a picture compared to a low-frequency component of the input video signal, with the degree of emphasis being reduced as the level of the input video signal increases. The vertical de-emphasis circuit has a non-linear de-emphasis characteristic for relatively attenuating a high .frequency component of the pre-emphasized video signal in a vertical spatial frequency of the picture compared to a low-frequency component of the pre-emphasized video signal, with the degree of attentuation being reduced as the level of the pre-emphasized video signal increases.
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公开(公告)号：EP0312362B1
公开(公告)日：1994-03-23
申请号：EP88309611.7
申请日：1988-10-13
CPC分类号： H04N5/7826 , H04N5/928 , H04N9/8216
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6.发明公开Recording of frequency-multiplex signal on recording medium 失效Aufzeichnung eines frequencyenzmodulierten信号auf einem Aufzeichnungsmedium。
公开(公告)号：EP0387804A2
公开(公告)日：1990-09-19
申请号：EP90104745.6
申请日：1990-03-13
发明人： Ichinoi, Yutaka , Hirota, Akira , Watanabe, Noboru
摘要： An apparatus for producing a frequency-multiplex signal on the basis of a plurlaity of signals so as to record the produced frequency-multiplex signal on a recording medium, second signal having a frequency lower than that of the first signal. The apparatus includes a multiplying circuit for multiplying the frequency of the second signal by 2 and an amplitude-modulator for multiplying the first signal by the output signal of the multiplying circuit. Also included in the apparatus is an adder for adding the second signal to the output signal of the amplitude-modulator, the output signal of the adder being recorded as the frequency-multiplexing signal on the recording medium.
摘要翻译： 一种用于根据多个信号产生频率复用信号的装置，以便将产生的频率复用信号记录在记录介质上，具有低于第一信号的频率的第二信号。 该装置包括用于将第二信号的频率乘以2的乘法电路和用于将第一信号乘以乘法电路的输出信号的幅度调制器。 该装置还包括一个加法器，用于将第二信号与幅度调制器的输出信号相加，加法器的输出信号作为频率复用信号被记录在记录介质上。
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公开(公告)号：EP0153861B1
公开(公告)日：1991-08-21
申请号：EP85301339.9
申请日：1985-02-27
发明人： Hirota, Akira , Tsushima, Takuya
IPC分类号： G11C27/04
CPC分类号： G11C27/04
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公开(公告)号：EP0133048B1
公开(公告)日：1991-01-09
申请号：EP84305185.5
申请日：1984-07-30
发明人： Hirota, Akira , Tsushima, Takuya
IPC分类号： H04N5/92
CPC分类号： H04N5/923
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公开(公告)号：EP0153861A3
公开(公告)日：1988-05-25
申请号：EP85301339
申请日：1985-02-27
发明人： Hirota, Akira , Tsushima, Takuya
IPC分类号： G11C27/02
CPC分类号： G11C27/04
摘要： A video signal delay circuit comprises an input hiorizon- tal transfer register (13) supplied serinlly with am input composite video signal, an input vertical t ransfer gate (14), a plurality of columns (15) of vertical transfer registers, an output vertical transfer gate (16), an output horizontal transfer register (17), a hotizontal transfer clock pulse generating circuit (19), a vertical transfer clock pulse gemerat- ing circuit (33) and a vertical transfer gate pulse generating circuit (32). The vertical transfer clock oulse generating circuit generates a vertifal transfer clock pulse at a rate of once per one horizontal scanning period of the ir put composite video signa and additionally generates one or more vertical transfer clock pulses during a specific ti me period. Or, the horizcontal transfer clock pulse generating circuit generates a horizontal transfer clock pulse having a selected phase or a selected number of horizontal transfer clock pulses.
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公开(公告)号：EP0169013A2
公开(公告)日：1986-01-22
申请号：EP85304825.4
申请日：1985-07-05
IPC分类号： H04N5/12
CPC分类号： H04N9/797
摘要： A video signal recording and reproducing apparatus comprises a circuit (12) for generating a first signal having a sampling frequency f s which is approximately a natural number multiple of a horizontal scanning frequency f H of an input composite video signal and satisfies F s ≒ f L + fu and having a phrase which differs by 180° for every one field, where f L represents a constant frequency in the range of 0.5 to 1 MHz and fu represents an upper limit frequency of a band required for a reproduced composite video signal a circuit (13) for sampling a signal part of the input composite video signal at least exluding synchronizing signal intervals thereof by the first signal, a circuit (14, 15) for recording and reproducing the sampled signal on and from a recording medium, a circuit (16) for obtaining from the reproduced signal first and second reproduced sampled signals having a mutual time difference of one field, a circuit (17) for generating from the reproduced signal a second signal having the frequency f s and having a phase which differs by 180° for every one field, and a circuit (18) supplied with the second signal for alternately and selectively passing the first and second reproduced sampled signals for every 1/2 period of the second signal so as to obtain a reproduced composite video signal which has been re-sampled.
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