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101. 发明专利

JPH04286772A DIGITAL VIDEO TAPE RECORDER 失效
公开(公告)号：JPH04286772A
公开(公告)日：1992-10-12
申请号：JP5218191
申请日：1991-03-18
申请人： HITACHI LTD
发明人： OKU MASUO , TAKAHASHI SUSUMU , FUJII YUKIO , ICHIGE KENJI
IPC分类号： G11B15/467 , G11B20/12
摘要： PURPOSE:To improve the degree of freedom in setting the number of revolution of a drum by recording and reproducing a single unit of a video signal by means of segments which are smaller than the unit of a signal track. CONSTITUTION:A helical signal track 5 is divided into plural number of segments 14b for video signal, the video signal is recorded for each field by utilizing the segment as a minimum unit, and a recording grard space 14c is provided between the segments. Thus, the degree of freedom in setting the number of revolution of the drum can be improved and the digital VTR is miniaturized.

102. 发明专利

JPH04281267A METHOD AND DEVICE FOR RECORDING/REPRODUCING TRACKING SIGNAL 失效
公开(公告)号：JPH04281267A
公开(公告)日：1992-10-06
申请号：JP4319991
申请日：1991-03-08
申请人： HITACHI LTD
发明人： TAKAHASHI SUSUMU , OKU MASUO , FUJII YUKIO , ICHIGE KENJI
IPC分类号： G11B5/588 , G11B15/467 , G11B20/12
摘要： PURPOSE:To realize the area division recording of a tracking signal without making a mechanism large size by winding a tape around a cylinder over 180 deg. and recording the tracking signal on an overlapping part over 180 deg.. CONSTITUTION:A video signal and an audio signal are digitized and coded respectively in a video encoder 2 and an audio encoder 6, thereafter, these signals are modulated to the column of code suitable for magnetic recording. In the meantime, the tracking signal is outputted from an ATF signal generator 13. Then, the video and audio codes are recorded in the area of a magnetic tape 25 corresponding to the 180 deg. part of the cylinder 19 and the tracking signal is recorded in the area corresponding to the overlapping part over 180 deg. of the cylinder 19. Therefore, the area division recording of the tracking signal is performed and the device is miniaturized.

103. 发明专利

JPH04245880A RECORDING AND REPRODUCING DEVICE FOR DIGITAL VIDEO SIGNAL 失效
公开(公告)号：JPH04245880A
公开(公告)日：1992-09-02
申请号：JP1113791
申请日：1991-01-31
申请人： HITACHI LTD
发明人： FUJII YUKIO , OKU MASUO , TAKAHASHI SUSUMU , ICHIGE KENJI , TACHIBANA HIROAKI
IPC分类号： G11B20/00 , G11B20/10 , H04N5/92
摘要： PURPOSE:To reduce picture distortion at the time of copy in a digital video signal recording and reproducing device executing compression and recording. CONSTITUTION:A signal line is provided between a channel decoding circuit 5 and a selection circuit 33 and a compression processing circuit 32 is bypassed on an input-side. A line bypassing an expanding processing circuit 37 and a selection circuit 38 are provided on an output side. Since a conventional serial input/output processing means is shared while compression and expandion processings becoming a cause of picture distortion are bypassed and digital picture data can be recorded and reproduced, the deterioration of the picture can be reduced at the time of copy without installing an additional input/output processing means.

104. 发明专利

JPH04178093A COLOR SIGNAL EMPHASIS CIRCUIT AND VIDEO SIGNAL RECORDING AND REPRODUCING DEVICE USING THE SAME 失效
公开(公告)号：JPH04178093A
公开(公告)日：1992-06-25
申请号：JP30412490
申请日：1990-11-13
申请人： HITACHI LTD
发明人： ABE HIROCHIKA , OKU MASUO , TAKAHASHI SUSUMU , FUJII YUKIO , TACHIBANA HIROAKI
IPC分类号： H04N9/793 , H04N9/79
摘要： PURPOSE:To solve a problems of decoloring or missing of color at a thin longitudinal line part by detecting a colored thin longitudinal line and amplifying the detected part selectively. CONSTITUTION:A demodulation circuit 1 demodulates a chrominance carrier signal into base band color difference signals R-Y, B-Y and a thin line detection circuit 2 detects a thin line, and a gain is increased for a reversible gain amplifier 3 to darken the color of the thin line. Differentiating circuits 10, 11 of the thin line detection circuit 2 differentiates the signal twice to allow the circuit 12 to detect a zero cross point of the differentiating signal and a pulse C is generated. Succeeding circuits discriminate an interval of edges based thereon and the gain of the amplifier 3 is increased when the interval is less than a time.

105. 发明专利

JPH04129398A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH04129398A
公开(公告)日：1992-04-30
申请号：JP24867590
申请日：1990-09-20
申请人： HITACHI LTD
发明人： ABE HIROCHIKA , OKU MASUO , TAKAHASHI SUSUMU , FUJII YUKIO , TAKAMIYA MASASHI
IPC分类号： H04N9/82 , H04N9/83
摘要： PURPOSE:To suppress unsharpening, distortion and moire by separating a color signal into two signals, recording the one signal by a low frequency conversion chrominance signal recording system, superimposing the other signal onto a luminance signal and recording the superimposed signal by the FM modulation direct recording system. CONSTITUTION:A chrominance carrier signal inputted from an ACC circuit 1 is band-limited by a band pass filter 3, the result is fed to a frequency conversion circuit 4 and fed to a subtractor circuit 51. The circuit 51 subtracts a signal at a narrow band from a filter 3 from the chrominance carrier signal inputted from the circuit 1 to generate a high frequency chrominance signal. The high frequency signal is subject to amplitude limit by an amplitude filter 2' and the result is fed to an adder circuit 19, then the resulting signal is superimposed on a luminance signal and FM-modulated. Only a small amplitude signal is separated by the amplitude filter 2' and no large amplitude signal is used. Thus, part of information is lost from the high frequency and large amplitude signal such as a contour signal with high saturation color, but since it is corrected by an edge enhancer of the reproduction system, there is no problem. Since the amplitude of the color signal is limited by the filter 2', no effect is caused on the luminance signal. Moreover, since a low frequency color signal is all recorded independently of its amplitude, the signal is reproduced by a conventional reproducing device, which offers complete compatibility.

106. 发明专利

JPH03177179A TIME BASE COLLECTOR 失效
公开(公告)号：JPH03177179A
公开(公告)日：1991-08-01
申请号：JP31539789
申请日：1989-12-06
申请人： HITACHI LTD
发明人： FUJII YUKIO , OKU MASUO , ABE HIROCHIKA , TAKAHASHI SUSUMU , ROKUTA MORIHITO
IPC分类号： H04N5/956 , G11B20/02 , H04N5/95 , H04N9/89 , H04N9/896
摘要： PURPOSE:To surely and accurately extract a desired data and to attain picture reproduction without position fluctuation by replacing a video signal read from a memory into a composite synchronizing signal generated by a reference synchronizing signal generator. CONSTITUTION:When a blanking signal BLNK is fed to a switch 16, it is thrown to the position of Y to select a composite synchronizing signal CSYNC. Thus, a composite synchronizing signal CSYNC is outputted from an output terminal 12 in place of a horizontal synchronizing signal of a video signal Vout, a vertical synchronizing signal and an equalizing pulse. Thus, the composite synchronizing signal CSYNC of the video signal Vout is replaced into the composite synchronizing signal CSYNC synchronously with it and a horizontal synchronizing signal and a vertical synchronizing signal with excellent waveform in the video signal Vout obtained at the output terminal 12 are set at a correct position. Thus, the deviation in the vertical direction of a reproduced picture is prevented on the monitor screen and a desired data added in a vertical blanking period of the video signal Vout is surely and accurately extracted.

107. 发明专利

JPH037477A CONTOUR CORRECTION CIRCUIT 失效
公开(公告)号：JPH037477A
公开(公告)日：1991-01-14
申请号：JP14114589
申请日：1989-06-05
申请人： HITACHI LTD
发明人： ABE HIROCHIKA , OKU MASUO , FUJII YUKIO , TAKAHASHI SUSUMU , IMAMURA OSAMU
IPC分类号： H04N5/208 , G06T7/60 , H04N1/40 , H04N1/409 , H04N9/68
摘要： PURPOSE:To obtain excellent correction effect by using a signal just after and just before the start so as to replace a signal changing at a contour part with them. CONSTITUTION:A video signal input A inputted from an analog input terminal 10 is differentiated by a differentiating circuit 2 and a waveform B is obtained by taking the absolute value of the differentiated signal. Moreover, a waveform C is obtained by differentiating the waveform B by a differentiating circuit 4. The waveform C has a positive value from the change start point of the signal till the middle of the contour (before the displacement) among the video contour of the video image and has a negative value from the middle till the end point of the change (after the displacement). The signal is compared with a prescribed threshold level shown in dotted lines in the waveform C. The waveform C is detected by a waveform shaping circuit S to obtain detection signal waveforms D, E and when the positive value is discriminated from the contour part by using the waveform D and the negative waveform E, the position of the contour and the width are coded and the result is recorded in a memory 6 together with a video signal from a delay circuit 12 as contour detection information. Thus, color blurring and fog are improved.

108. 发明专利

JPH02311087A VIDEO CONTOUR CORRECTION CIRCUIT 失效
公开(公告)号：JPH02311087A
公开(公告)日：1990-12-26
申请号：JP13131089
申请日：1989-05-26
申请人： HITACHI LTD
发明人： ABE HIROCHIKA , OKU MASUO , FUJII YUKIO , TAKAHASHI SUSUMU
IPC分类号： H04N5/208
摘要： PURPOSE:To attain excellent contour correction by feeding back a value just before and just after a change in the signal in the first half and the latter half of the contour information respectively to a current signal and a contour part signal. CONSTITUTION:A waveform E retarding a waveform D obtained by N-bit further from N-bit delay of a waveform B shown in the first half of a contour line is obtained. A waveform F is obtained by applying 2N-bit delay to an input signal waveform A. Both D, F signals are inputted to an edge processing circuit 3. A coefficient control circuit 47 sets a coefficient KE to 1 for a period when an input signal is at a high level and the coefficient to 0 for a period of low level. When the coefficient KE is 1, an output of a delay circuit 46 is an output of an adder 45 as it is and inputted again to the circuit 46. That is, the output signal at a terminal 48 keeps the value just before the coefficient control signal reaches a high level for a high level period. Thus, the waveform F passing through the circuit 3 becomes a waveform G. Then excellent contour correction is attained.

109. 发明专利

JPH02306775A CONTOUR CORRECTION CIRCUIT 失效
公开(公告)号：JPH02306775A
公开(公告)日：1990-12-20
申请号：JP12660889
申请日：1989-05-22
申请人： HITACHI LTD
发明人： ABE HIROCHIKA , OKU MASUO , FUJII YUKIO , TAKAHASHI SUSUMU , IMAMURA OSAMU
IPC分类号： H04N5/12 , H04N5/208 , H04N9/89 , H04N9/896
摘要： PURPOSE:To attain contour correction and time axis conversion at the same time by using a means generating a clock synchronously with an external video signal coupling with an input video signal synchronizingly so as to convert a time axis and detecting the contour information of an input video signal so as to change locally the period of a write or a readout clock. CONSTITUTION:A voltage controlling the oscillating frequency of a voltage controlled oscillator(VCO) 7 is a voltage resulting from the addition of a voltage in response to a change in an input signal to an output voltage of a phase comparator circuit 8 and a clock with a different period from that of a readout clock is obtained locally as a frequency of the write clock. Then a control voltage superimposed with an AC voltage reflecting its contour component is fed to the VCO 7 resulting that the period of a generated clock is changed at the contour part. Thus, the data interval of the contour part is subjected to time compression at the write and the contour correction effect making the waveform of the contour part steep is obtained and since the write read of the memory are implemented by the clock synchronously with the time fluctuation of the input signal without having any time fluctuation, the time axis is corrected at the same time.

110. 发明专利

JPH02276002A MAGNETIC PICTURE RECORDING DEVICE 失效
公开(公告)号：JPH02276002A
公开(公告)日：1990-11-09
申请号：JP9510689
申请日：1989-04-17
申请人： HITACHI LTD
发明人： OKU MASUO , FUJII YUKIO , AZEYANAGI TOMOMITSU , ABE HIROCHIKA , TAKAHASHI SUSUMU
IPC分类号： G11B5/008
摘要： PURPOSE:To eliminate the problem of crosstalk by alternately arranging a first information track to record/reproduce by means of a video head used in a normal mode as well, and a second information track to second/reproduce by means of an FP head. CONSTITUTION:An FP (Fast Play) mode track pattern 4 expresses a sound track 1, a video track and an additional track 3. On the sound track 1, a sound signal is recorded by a sound head (HF head) 7 before a video signal is recorded on the video track 2 by an SP head 8, thereafter the video signal is overlapped, and the sound signal is recorded in a deep layer. On the additional track 3, a signal that can record/reproduce the video or sound at a high quality by an FP head 9 is recorded/reproduced. Thus the crosstalk caused by guard-band- less recording is completely eliminated, and an interference with the adjoining track can be prevented from being generated.

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