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21. 发明专利

JPH0570356B2 失效
公开(公告)号：JPH0570356B2
公开(公告)日：1993-10-04
申请号：JP1003984
申请日：1984-01-25
申请人： HITACHI LTD
发明人： AYUSAWA IWAO
IPC分类号： H04N5/335 , H04N5/341 , H04N5/374

22. 发明专利

JPH0591336A SYSTEM AND DEVICE FOR RECORDING AND REPRODUCING STILL PICTURE 失效
公开(公告)号：JPH0591336A
公开(公告)日：1993-04-09
申请号：JP27636891
申请日：1991-09-30
申请人： HITACHI LTD
发明人： YOSHIOKA ATSUSHI , AYUSAWA IWAO
IPC分类号： H04N1/41 , H04N7/26
摘要： PURPOSE:To reduce the circuit scale and to prevent the impossibility of data processing for reproducing from being erroneously recognized as trouble with respect to recording and reproducing of still picture data in a recording medium like a card. CONSTITUTION:Input still picture data is compressed by a DCT circuit 2, a quantizing circuit 3, and an encoding circuit 4 and is recorded in the recording medium like a card by a card connector 6. A specific table conforming to JPEG is set in the quantizing circuit 3 and the encoding circuit 4. When data is reproduced from the recording medium like a card, data read out from it is processed in a code decoder circuit 7, an inverse quantizing circuit 9, and an IDCT circuit 11 to obtain the original picture. Meanwhile, information of an encoding table and quantization table added to this data are detected by an encoding table detecting circuit 8 and a quantization table detecting circuit 10. If they are different from those set to the encoding circuit 4 and the quantizing circuit 3 and the data processing is impossible, a warning display circuit 13 gives a warning.

23. 发明专利

JPH04309085A VIDEO SIGNAL RECORDING AND REPRODUCING SYSTEM 失效
公开(公告)号：JPH04309085A
公开(公告)日：1992-10-30
申请号：JP7491191
申请日：1991-04-08
申请人： HITACHI LTD
发明人： ITO SHIGEYUKI , AYUSAWA IWAO , YOSHIOKA ATSUSHI
IPC分类号： G11B20/10 , G11B27/34 , H04N5/278 , H04N5/91 , H04N5/92
摘要： PURPOSE:To facilitate the revision of an output method and to reduce a total memory quantity by selecting a picture output point to be the same as a recording end point of a digital picture data. CONSTITUTION:A digital data such as a title data and a digital still picture data and an output control data for output control of the recorded digital data are recorded on other recording track than a video signal recording track. Or as other method, a picture data such as a title data and a digital still picture data is stored in a memory 12 and only an output control data for output control such as output method or output point for the title data and the digital still picture data is recorded on other recording track than the video signal recording track. Or a digital data such as a title data and a digital still picture data is recorded on other recording track than the video signal recording track and the output control data for output control of the recorded digital data is stored in the memory 12.

24. 发明专利

JPH04240992A MAGNETIC VIDEO RECORDING DEVICE AND MAGNETIC VIDEO RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH04240992A
公开(公告)日：1992-08-28
申请号：JP753591
申请日：1991-01-25
申请人： HITACHI LTD
发明人： YOSHIOKA ATSUSHI , ITO SHIGEYUKI , AYUSAWA IWAO
IPC分类号： G11B20/02 , G11B20/06 , H04N5/92 , H04N5/928 , H04N9/83 , H04N9/88
摘要： PURPOSE:To minimize revision of an existing circuit, to reduce a required memory capacity and to reduce the deterioration in an S/N with respect to quantization noise by providing a time base compression circuit compressing a luminance signal, a time base compression circuit compressing a low frequency conversion chrominance signal and a time base compression circuit compressing an audio signal to the device. CONSTITUTION:A time base compression circuit 18 compressing a luminance signal Y is provided between a branch point to a synchronizing separator circuit 16 and an FM modulation circuit in a luminance recording processing system bringing the luminance signal Y whose level is made constant by an AGC(automatic gain control) circuit 8 into a luminance FM modulation signal. Moreover, a time base compression circuit 27 compressing a chrominance signal C is provided to a post-stage of a frequency conversion circuit for low frequency conversion in a chrominance signal processing system bringing an input chrominance signal into a low frequency conversion chrominance signal. Furthermore, a time base compression circuit 30 is provided between the FM modulation circuit and an amplitude compression circuit for noise reduction in an audio recording processing system in the case of an audio signal is recorded multiplexedly onto a video track.

25. 发明专利

JPH04176275A IMAGE SYNTHESIZING DEVICE 失效
公开(公告)号：JPH04176275A
公开(公告)日：1992-06-23
申请号：JP30233990
申请日：1990-11-09
申请人： HITACHI LTD
发明人： IMAMURA OSAMU , AYUSAWA IWAO
IPC分类号： H04N5/265 , H04N9/74
摘要： PURPOSE:To obtain various kinds of image synthesizing effects by providing two switch means selecting either of an input video signal or the output picture signal of a picture signal generation circuit and adding the output picture signal of these switch-means by means of an adder where an addition rate varies. CONSTITUTION:A picture signal (c) is supplied to a B side of a switch 1, and an output picture signal (d) of a picture signal generation circuit 4 to the B side of a switch 2. The switch 1 selects either of picture signals (a) or (c) by means of a control signal (g). The switch 2 selects either of picture signals (b) or (d) by means of a control signal (h). The output picture signals (e) and (f) of the switches 1 and 2 are supplied to an adder 5. Then, for example, the picture signals (a) and (b) are respectively inputted from input terminals 6 and 7, and when the addition rate of the adder 5 is successively changed while the switches 1 and 2 are respectively closed to the A side, the screen obtained in an output terminal 8 is gradually changed from a moving image to a title, or the picture is changed in reverse, and the CF(cross fade) effect can be obtained.

26. 发明专利

JPH0427729B2 失效
公开(公告)号：JPH0427729B2
公开(公告)日：1992-05-12
申请号：JP18838783
申请日：1983-10-11
申请人： HITACHI LTD
发明人： AYUSAWA IWAO , NAKAGAWA HIMIO
IPC分类号： H03K3/03 , H03K3/354

27. 发明专利

JPH04124989A MAGNETIC VIDEO RECORDER AND MAGNETIC VIDEO RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH04124989A
公开(公告)日：1992-04-24
申请号：JP24373990
申请日：1990-09-17
申请人： HITACHI LTD
发明人： YOSHIOKA ATSUSHI , ITO SHIGEYUKI , AYUSAWA IWAO
IPC分类号： H04N9/802 , G11B20/02 , H04N9/80 , H04N9/82 , H04N9/83
摘要： PURPOSE:To prevent the deterioration of S/N by respectively providing time base compression circuits between a branching point to a synchronizing separation circuit and an FM modulation circuit in a luminance recording processing system, in the poststage of a frequency conversion circuit in a chromaticity recording processing system, and between an amplitude compression circuit and an FM modulation circuit in a sound recording processing system. CONSTITUTION:In a time base compression circuit 18, an inputted luminance signal is compressed by time base for each one field while constantly maintaining its field cycle. A reduction conversion chromaticity signal outputted from a chromaticity conversion processing circuit 25 is supplied to a time base compression circuit 27 after unnecessary components outside a band is eliminated in an LPF 26, and the time base compression processing is performed at the similar timing with the luminance signal. A sound signal is supplied to a time base compression circuit 30 and compressed by time base for each time length equivalent to one field at the timing similar to the above- mentioned one. The synthetic signal of a luminance FM modulation signal, reduction conversion chrominaticity signal, sound FM modulation signal, and pilot signal is alternately supplied to video heads 38A and 38B for each one field and recorded on a magnetic tape 39.

28. 发明专利

JPH03157065A SYNCHRONIZING SIGNAL GENERATOR 失效
公开(公告)号：JPH03157065A
公开(公告)日：1991-07-05
申请号：JP29502889
申请日：1989-11-15
申请人： HITACHI LTD
发明人： IMAMURA OSAMU , AYUSAWA IWAO
IPC分类号： H04N5/06 , H04N5/95
摘要： PURPOSE:To prevent malfunction due to noise of a frequency divider by discriminating whether or not a pulse width of an input synchronizing signal for a pre-hold period represents a regular width or noise, detecting the noise depending on a discrimination signal and initializing the frequency divider with a regular signal. CONSTITUTION:A period signal generator 10 inputs an initial synchronizing signal J and outputs a command signal K applying preholding to a skew and a period scheduling in the vicinity of skew jump production period and operates a discrimination device 9 by using an output L for a period estimating skew and a period after skew jump in the period of the output K. A recovered horizontal synchronizing signal A is inputted to the discrimination device 9, in which the signal is compared with a pulse width in the inside and when the pulse width is regular, it is regarded to be a normal signal and no output is caused, and when the pulse width is not normal, it is regarded as noise and an output I is generated and an output of a delay device 7 is reset. Thus, malfunction of initial operation due to noise is prevented and the phase of a frequency divider 2 is transferred momentarily to the phase of the recovered horizontal synchronizing signal A.

29. 发明专利

JPH0216064B2 失效
公开(公告)号：JPH0216064B2
公开(公告)日：1990-04-16
申请号：JP718982
申请日：1982-01-20
申请人： HITACHI LTD
发明人： AYUSAWA IWAO
IPC分类号： H03L7/08 , H03L7/06

30. 发明专利

JPH0276380A ELECTRONIC STILL CAMERA 失效
公开(公告)号：JPH0276380A
公开(公告)日：1990-03-15
申请号：JP22665688
申请日：1988-09-12
申请人： HITACHI LTD
发明人： TODAKA YOSHIHIRO , AYUSAWA IWAO
IPC分类号： H04N5/335 , H04N5/341 , H04N5/353 , H04N5/357 , H04N5/369 , H04N5/372 , H04N5/374 , H04N5/376 , H04N5/378
摘要： PURPOSE:To utilize electric charges stored in a sensor effectively and to improve the resolution and sensitivity at field picture recording by adopting one-line readout drive in the case of frame picture recording and frame sensitivity for the changeover of sensitivity and adopting 2-line readout drive in the case of field picture recording and field sensitivity for the changeover of sensitivity. CONSTITUTION:When a field/frame SW is thrown to the position of the field, a control circuit 8 switches the sensitivity of an exposure control circuit 24 to the field sensitivity and a camera circuit 5 also selects a field signal processing. After the end of exposure by the opening/closing of a shutter 21, a drive circuit 4 applies 2-line readout, a field picture is extracted from a sensor 3 and recorded in a recording section 6 through the camera circuit 5. Since signals from two photodiodes of (2n+1) and (2n+2) lines are read out, the signal charges obtained by photoelectric conversion are doubled and then the sensitivity is improved. Since the G component is included in picture element pitches in the horizontal direction, that is, in all columns of m, (m+1), the horizontal resolution is improved.

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