专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

101. 发明专利

JPS60163593A RECORDING AND REPRODUCING DEVICE OF VIDEO SIGNAL 失效
公开(公告)号：JPS60163593A
公开(公告)日：1985-08-26
申请号：JP1834484
申请日：1984-02-06
申请人： HITACHI LTD
发明人： KOMATSU KEIICHI , SHIBATA AKIRA , AZEYANAGI TOMOMITSU , MITSUHAYASHI SHIYUNSUKE
IPC分类号： H04N9/84 , H04N9/79 , H04N9/83
摘要： PURPOSE:To suppress edge noise and to reduce the quantity lost by ripple and to realize a picture with excellent quality by diversing the energy of an edge and reducing an amount of overshoots at the time of recording. CONSTITUTION:An AGC circuit 2 at the recording side of a recording and reproducing device absorbs the variance of input level of an input video signal, and an LPF3 removes a chroma signal. A recorded video phase equalizer circuit 101 is provided between the LPF3 and a dynamic emphasis circuit 7 to emphasize a high band component of the posterior video signal, and an edge part is applied with preshoot. The video signal having reduced overshoot quantity of the edge is converted into an angle modulation signal by an angle modulation circuit 10, and recorded on a magnetic tape 21. A chroma signal is removed at the reproduction side of an HPF25 and a reproduction signal is demodulated by an FM demodulator 31. A reproduction video phase equalizer circuit 102 is provided between the demodulator 31 and a dynamic de-emphasis circuit 34 and conducts overshooting of an edge at the reproduction side.

102. 发明专利

JPS6093814A NONLINEAR AMPLIFYING CIRCUIT 失效
公开(公告)号：JPS6093814A
公开(公告)日：1985-05-25
申请号：JP20094883
申请日：1983-10-28
申请人： HITACHI LTD
发明人： MITSUHAYASHI SHIYUNSUKE , KOMATSU KEIICHI , SHIBATA AKIRA
IPC分类号： H04N5/20 , G11B20/02 , H03G11/00 , H03G11/02 , H04N5/91
摘要： PURPOSE:To set optionally the size of the area, where an input signal is not permitted to pass through, and the gain of the area where the input signal is outputted, by inputting the input signal to a linear amplifier and an amplitude limiting amplifier and subtracting the output of the amplitude limiting amplifier from the output of the linear amplifier. CONSTITUTION:A linear amplifier 8 and an amplitude limiting amplifier 9 are connected in parallel, and an subtractor 10 is provided in the output side of them. A signal 12 inputted to an input terminal 7 is led to amplifiers 8 and 9. The amplifier 8 amplifies the signal 12 and outputs a signal 13. The amplifier 9 amplifies the signal 12 and limits the amplitude to output a signal 14. The subtractor 10 subtracts the signal 14 from the signal 13 to obtain a signal 15. Thus, a gain of the amplifier 8 and a degree of amplitude limitation of the amplifier 9 are selected to set optionally the size of the area, where the input signal is not outputted, and the gain of the area where the input signal is outputted.

103. 发明专利

JPS59139112A Magnetic recording and reproducing device 失效
标题翻译：磁记录和再现设备
公开(公告)号：JPS59139112A
公开(公告)日：1984-08-09
申请号：JP1155583
申请日：1983-01-28
申请人： Hitachi Ltd
发明人： SHIBATA AKIRA , KOMATSU KEIICHI
IPC分类号： H04N5/91 , G11B20/06 , H04N9/82 , H04N9/83
CPC分类号： H04N9/82
摘要： PURPOSE:To suppress mutual interference between a sound signal and a video signal by smoothing record equalizing characteristics for a luminance signal, inserting a comb line filter to a liminance signal circuit and connecting a recording chroma signal circuit to a chroma signal equalizing circuit. CONSTITUTION:Parts 20, 21 are a luminance signal (YFM) extracting LPF and a chroma subcarrier suppressing comb line filter respectively and a circuit 22 uniforms synchronous peak potential and smoothes the characteristics of circuits 24, 25. A luminance signal YFM is obtained from the output of a frequency modulation circuit 27. On the other hand, parts 30, 31 are a chroma signal (CL) extracting BPF and a YFM suppressing filter respectively. A part 39 is a CL recording equalizer and a part 41 is a sound signal compressing circuit. Since said constitution prevents the emphasis of the lower band wave of the YFM, the lower band wave is not leaked into a band of an AFM. In addition, connection of a compressor 41 to a sound circuit prevents a sound signal from being distorted by the YFM. Since the CL recording equalizer 39 suppresses the upper wave of the CL, the distortion of the sound signal by the CL is resolved. Smoothing recording current for the YFM suppresses noises due to the DP (differential phase) of a head system and a circuit 35 in the CL circuit prevent leakage from the sound circuit.
摘要翻译：目的：通过平滑亮度信号的记录均衡特性来抑制声音信号和视频信号之间的相互干扰，将梳状滤波器插入限位信号电路，并将记录色度信号电路连接到色度信号均衡电路。构成：部件20,21是分别提取LPF和色子副载波抑制梳状线滤波器的亮度信号（YFM），并且电路22均匀同步峰值电位，并使电路24,25的特性平滑化。从...获得亮度信号YFM 输出频率调制电路27.另一方面，部分30,31分别是提取BPF和YFM抑制滤波器的色度信号（CL）。部分39是CL记录均衡器，部分41是声音信号压缩电路。由于所述结构防止YFM的低频波的强调，所以较低频带波不会泄漏到AFM的频带中。此外，压缩机41与声音电路的连接防止声音信号被YFM扭曲。由于CL记录均衡器39抑制CL的上部波，所以解析了CL的声音信号的失真。用于YFM的平滑记录电流抑制由于头系统的DP（差分相位）引起的噪声，并且CL电路中的电路35防止来自声音电路的泄漏。

104. 发明专利

JPS58119289A LUMINANCE SIGNAL REPRODUCING PROCESSING CIRCUIT 失效
公开(公告)号：JPS58119289A
公开(公告)日：1983-07-15
申请号：JP182982
申请日：1982-01-11
申请人： HITACHI LTD
发明人： KOMATSU KEIICHI , SHIBATA AKIRA , AZEYANAGI TOMOMITSU , KOJIMA NOBORU
IPC分类号： H04N9/84 , H04N9/87 , H04N9/88
摘要： PURPOSE:To obtain a processing circuit reducing noise and correcting vertical shift in a chroma signal on a screen, by switching a compensation signal of dropout period around the horizontal synchronizing signal, in a VTR. CONSTITUTION:A signal reproduced at a video head 1 is amplified at a preamplifier 2, a luminance FM signal is obtained through a high pass filter 3 and a chroma signal is obtained through a low pass filter 4. At the period without dropout, a switch 5 is selected to the down-position, a luminance FM signal is inputted to a 1H dela line 6, the delayed output is demodulated into a video signal at a demodulator 7 and led to a mixing circuit 8, mixed with a chroma signal from a comb-type filter 11 and a reproduced video signal is outputted. If dropout takes place, the switch 5 is selected to the inverted position, an input signal is changed over to an output signal of the delay line 6, the input and output of the delay line 6 are the same information signal, and a video signal prior to 1H is demodulated at the output of the demodulator 7, allowing to compensate any long dropout.

105. 发明专利

JPS5860891A PAL SYSTEM VIDEO TAPE RECORDER 失效
公开(公告)号：JPS5860891A
公开(公告)日：1983-04-11
申请号：JP15881381
申请日：1981-10-07
申请人： HITACHI LTD
发明人： SHIBATA AKIRA , KOJIMA NOBORU , KOMATSU KEIICHI , AZEYANAGI TOMOMITSU
IPC分类号： G11B20/02 , H04N9/84 , H04N9/87 , H04N9/88
摘要： PURPOSE:To eliminate color deviation by inserting a one-horizontal-period delay circuit into an Y signal regenerating circuit at a halfway point, and thus synchronizing an Y signal and a C (color) signal with each other. CONSTITUTION:A signal read out of a video tape 1 by a video head 2 is inputted to a preamplifier 3. A C signal is inputted to an Y and C mixer 8 through a C signal regenerating circuit 5 and a comb-shaped filter 9. A Y signal is inputted to the mixer 8 through a Y signal regenerating circuit 4 via a one- horizontal-period delay circuit. A frequency converter 11 inputs an FM signal and a high-frequency continuous signal outputted from a local oscillator 12 to output FM signals of the sum and difference frequencies between both the input signals. Those signals are inputted to a 1H (one horizontal scanning period) glass delay line 15 through a switching circuit 14, and only one signal is inputted to the regenerating circuit 4 of an FM demodulator. In case of the generation of a dropout, a dropout detector 13 operates to switch the switching circuit 14 temporarily.

106. 发明专利

JPS5860406A VIDEO TAPE RECORDER WITH FLYING ERASING HEAD 失效
公开(公告)号：JPS5860406A
公开(公告)日：1983-04-09
申请号：JP15881481
申请日：1981-10-07
申请人： HITACHI LTD
发明人： KOMATSU KEIICHI , SHIBATA AKIRA , MIURA KUNIAKI
IPC分类号： G11B5/024 , G11B20/02
摘要： PURPOSE:To reduce the cost by providing a recording and reproducing head, an erasing head, and a rotary transformer having plural channels connected to the erasing head, and then making the number of turns of the erasing head less than that of the recording and reproducing head. CONSTITUTION:In normal recording mode, a mode changeover switch 11 is turned off and no current flows to an erasing head 10. A luminance signal 14 and a chrominance signal 15 are mixed by a Y/C mixer 13, whose output is amplified by a recording amplifier 4 and applied to a recording head 1. In editing mode, the switch 11 is turned on, and said signal is amplified through an erasing amplifier 12 by using the signal 14 and then applied to the series-connected erasing heads 10 through a rotary transformer 16. The numbers of turns of primary and secondary windings of the transformer 16 are each one; and the number of turns of the primary winding of a rotary transformer 2 is eight at the inside and six at the outside, and that of the secondary winding is four at the inside and three at the outside. The number of turns of winding of the head 10 is four and that of a head 1 is twenty; and amplifiers 4 and 12 have the same level to generate an erasing magnetic field which is five times as intense as an optimum recording magnetic field.

107. 发明专利

JPS5839189A HIGH-DENSITY MAGNETIC PICTURE RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS5839189A
公开(公告)日：1983-03-07
申请号：JP13702581
申请日：1981-09-02
申请人： HITACHI LTD
发明人： AZEYANAGI TOMOMITSU , NAKAGAWA HIMIO , KOJIMA NOBORU , SHIBATA AKIRA , KOMATSU KEIICHI
IPC分类号： H04N9/84
摘要： PURPOSE:To make color signal processing circuits of NTSC-system and PAL- system VTRs common, by converting the NTSC color signal and the PAL color signal to a low band by carrier signals where the phase is shifted at 90 deg. and 45 deg. in evey one horizontal period of time. CONSTITUTION:A chrominance signal fSC applied to an input terminal 1 has the amplitude made constant in an ACC circuit 11 and is supplied to the first frequency converting circuit 12. An output signal SH of the first VCO 18 is divided into a carrier frequency fLSC of the low-band color signal by a frequency dividing circuit 19 and is applied to a phase selecting circuit 20. The phase selecting circuit 20 sets the phase of an output signal SC so that the phase of the color signal is shifted in every one horizontal time by a prescribed value (90 deg. for the NTSC system and 45 deg. for the PAL system). The output signal SC is multiplied by the output signal of the second VCO having a center frequency fSC in the second frequency (fSC+fLSC) of the sum between them, and this carrier signal is multiplied by the chrominance signal fSC in the first converter 12 to obtain a low-band color signal having the carrier frequency fLSC as a difference signal.

108. 发明专利

JPS57190487A SIGNAL PROCESSING CIRCUIT OF MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS57190487A
公开(公告)日：1982-11-24
申请号：JP7355081
申请日：1981-05-18
申请人： HITACHI LTD
发明人： KOJIMA NOBORU , SHIBATA AKIRA , MIURA KUNIAKI , KOMATSU KEIICHI
IPC分类号： G11B20/02 , H04N9/79 , H04N9/83 , H04N9/88
摘要： PURPOSE:To correct a relative delay of a chroma signal, and to elevate the S/N ratio of a signal, by providing a chroma signal comb line filter for suppressing a luminance signal, on a recording and reproducing signal processing circuit, and providing a 1H delaying circuit for 1H-delaying the luminance signal on said signal processing circuit. CONSTITUTION:A luminance signal of a video signal from an input terminal 14 is outputted to the output side of an LPF15, is 1H-delayed by a 1H delaying circuit 17, is FM-modulated by an FM moldulator 16, and is applied to a recording amplifier 20. Also, a video signal is applied to a chroma comb line filter 18, a chroma signal is 0.5H-delayed relatively against the luminance signal by the filter 18, is converted to a low band chroma signal by a down-converter 19, and after that, is applied to the amplifier 20, the low band chroma signal from the amplifier 20 is 0.5H-advanced relatively against the luminance FM signal, is outputted, and is applied to a recording head 21. In this way, a relative delay of the chroma signal is corrected, and the S/N ratio of the chroma signal is elevated.

109. 发明专利

JPS57117109A Magnetic recording and reproducing device 失效
标题翻译：磁记录和再现设备
公开(公告)号：JPS57117109A
公开(公告)日：1982-07-21
申请号：JP309481
申请日：1981-01-14
申请人： Hitachi Ltd
发明人： KOMATSU KEIICHI , SHIBATA AKIRA , MIURA KUNIAKI , KOJIMA NOBORU , KAWAMURA KOUTAROU , MIZUTANI KEIICHI , NARITA HIROSHI , KODAMA KOUJI
IPC分类号： H04N9/83 , G11B5/008 , G11B5/027
CPC分类号： G11B5/008
摘要： PURPOSE:To improve residual erasure at the insertion of jointed recording of a VTR and to achieve reproduction with good quality, by using a head wider in the gap length than track pitch and increasing the current for overlapped write- in than the standard current. CONSTITUTION:A luminance FM signal and a color signal are mixed at a YC mixer 3, and the current is increased while peaking is made at a carrier peaking circuit 4 for around 4MHz only and side band is suppressed, the output current frequency characteristics are as shown in dotted lines in figure. The rate of erasure is increased by increasing the recording current and residual erasure can be improved remarkably. Since the track width Tw is wider than a track pitch Tp, no guard band is caused, and even if an overlapped write track pattern 24 is shifted from a recorded pattern 23, the overlapped signal only is recorded on a tape. Thus, residual erasure can be improved and excellent reproduction can be made.
摘要翻译：目的：为了在插入VTR的连接记录时改善残留擦除，并通过使用比轨道间距更宽的间隙长度，并增加重叠写入的电流，而不是标准电流来实现高品质的再现。构成：在YC混频器3处混合亮度FM信号和彩色信号，并且在载波峰化电路4仅峰值约4MHz时，电流增加，并且边带被抑制，输出电流频率特性为如图中虚线所示。通过增加记录电流来增加擦除速率，可以显着改善残留擦除。由于轨道宽度Tw比轨道间距Tp宽，所以不会产生保护频带，即使重叠的写入轨迹图案24从记录的图案23偏移，仅将重叠信号记录在磁带上。因此，可以改善残留擦除，并且可以进行优异的再现。

110. 发明专利

JPS5784691A INSERTING DEVICE FOR CHARACTER INFORMATION 失效
公开(公告)号：JPS5784691A
公开(公告)日：1982-05-27
申请号：JP16078580
申请日：1980-11-17
申请人： HITACHI LTD
发明人： KOMATSU KEIICHI , SHIDA AKIRA , MIURA KUNIAKI , HIROSE KOUICHI , KOJIMA NOBORU , TAKEZAWA TERUHIRO , OOTA MASUTOMI
IPC分类号： H04N5/91 , G11B20/00 , G11B20/02
摘要： PURPOSE:To enable reproduction with good operating performance and without deterioration of video quality, by converting the character information which is desired to be superimposed on the playback picture of a VTR into an audio code signal, and recording it on audio channel in after recording mode. CONSTITUTION:In recording a character signal, first a VTR6 is reproduced and the mode is changed over to an after-recording-mode when the title, date are desired to be superimposed. When the character information preset with an insertion character designation circuit 7 is inputted to a signal conversion circuit 8, the character information is converted into an audio code signal and given to an audio code signal output terminal 9. The VTR6 is at the after-recording mode and the audio code signal only is recorded on an audio track from a VTR audio input terminal 10. At playback, the audio signal input is identified at a code signal discrimination circuit then separated into the audio signal and the audio code signal.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式