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61. 发明专利

JPH04276950A ERROR DETECTION CIRCUIT FOR O-QDPSK MODULATION WAVE 失效
公开(公告)号：JPH04276950A
公开(公告)日：1992-10-02
申请号：JP3847691
申请日：1991-03-05
申请人： SONY CORP
发明人： MURABAYASHI NOBORU
IPC分类号： G11B20/18 , H04L27/00 , H04L27/18
摘要： PURPOSE:To improve an error correction capability by discriminating data to be error data when a succeeding set of data of each data set of an offset QDPSK modulation wave is data unable to be an offset QDPSK modulation wave. CONSTITUTION:A signal fed from an amplifier 62 is fed to an 0-QDPSK demodulation circuit 71. The circuit 71 demodulates the signal synchronously with a carrier recovered by a carrier recovery circuit 72 and inputs a demodulation signal to a digital signal processing circuit 74. On the other hand, an error detection circuit 73 discriminates directly an error from an 0-QDPSK signal. In this discrimination, since a phase of a data series D1 of an 0-QDPSK modulation wave changes in a range of -pi/2 to +pi/2 with respect to a data series D0 just before the series D1, the phase is not chanted by -pi or +pi between the consecutive data series D0 and D1. Thus, the circuit 73 judges a succeeding data series being the data not in existence to be in error and gives error detection information to the circuit 74. Through the constitution above, the error correction capability is improved.

62. 发明专利

JPH04149863A DEVICE FOR DECIDING RECORDING MODE 失效
公开(公告)号：JPH04149863A
公开(公告)日：1992-05-22
申请号：JP27569890
申请日：1990-10-15
申请人： SONY CORP
发明人： KORI TERUHIKO , MURABAYASHI NOBORU
IPC分类号： H04N5/91 , G11B20/00
摘要： PURPOSE:To prevent the generation of an inhibited combination between a video recording mode and a digital recording mode and to secure interchangeability by deciding the recording mode of a video signal and deciding the mode of a digital signal to be additionally recorded in a medium. CONSTITUTION:In the case of post-recording a digital sound signal in a recorded tape, a normal mode or a high-eight mode is discriminated based upon a detection hole perforated on a tape cassette by a tape discriminating mechanism 31. In the case of a tape corresponding to the high-eight mode, a video recording mode discriminating circuit 46 discriminates whether a video signal is in a normal mode or a high-eight mode. When the video signal is the high-eight mode, switches SW3, SW4, SW22 in a sound signal recording system 20 are connected to the HIGH sides and a sound signal is recorded in the high-eight mode. When the video signal is the normal mode, the switches SW3, SW4, SW22 are connected to the NORMAL sides and the sound signal is recorded in the normal mode.

63. 发明专利

JPH04103002A VTR 失效
公开(公告)号：JPH04103002A
公开(公告)日：1992-04-06
申请号：JP22060290
申请日：1990-08-22
申请人： SONY CORP
发明人： MURABAYASHI NOBORU
IPC分类号： H04N5/91 , G11B5/02 , G11B5/09 , H04N5/92 , H04N5/928
摘要： PURPOSE:To make the current reproducing equalizer characteristic common by allowing a frequency characteristic of a digital sound signal reproduced from a second magnetic tape to coincide with a frequency characteristic reproduced from a first magnetic tape. CONSTITUTION:When a control signal is supplied to a recording amplifier 35 from a system controller 3, gain of the recording amplifier 35 is controlled in accordance with an output of a sensor 4 and a key 5. A level (magnitude of a recording current) of a recording signal SA supplied to heads 1A, 1B is controlled so that a frequency characteristic at the time of its reproduction coincides or roughly coincides with a frequency characteristic at the time of reproduction of an ME tape, when a tape 2 is an MP tape, and controlled so as to become ORC, when the tape 2 is an ME tape. In such a way, it becomes unnecessary to change a reproducing equalizer characteristic by whether the tape 2 is an MP tape or an ME tape.

64. 发明专利

JPH0474364A VTR 失效
公开(公告)号：JPH0474364A
公开(公告)日：1992-03-09
申请号：JP18749990
申请日：1990-07-16
申请人： SONY CORP
发明人： MURABAYASHI NOBORU
IPC分类号： G11B20/10 , G11B20/06
摘要： PURPOSE:To fitly discriminate a PCM sound mode by supplying a regenerated digital sound signal to a sequential multiplication circuit to be multiplied by an even number and discriminating the frequency of an output signal of this sequential multiplication circuit. CONSTITUTION:The subject device is provided with the sequential multiplication circuit 43 for multiplying the regenerated digital sound signal SA by an even number and circuits 441-463 and 3 for discriminating the frequency of the output signal of the sequential multiplication circuit 43. In this case, in particular, 2-step multiplication is performed on the PCM sound signal SA immediately after its regeneration, and by discriminating this sequential multiplication signal SB in frequency, a PC mode of the PCM sound signal SA is discriminated, so that frequency differences between a linear mode, a nonlinear mode and an NRML mode are enlarged. By this method, the PCM mode is easily and securely discriminated.

65. 发明专利

JPH0444482A VTR 失效
公开(公告)号：JPH0444482A
公开(公告)日：1992-02-14
申请号：JP15322490
申请日：1990-06-12
申请人： SONY CORP
发明人： MURABAYASHI NOBORU , TSUBAKI AKIHIRO
IPC分类号： H04N5/91 , G11B5/008 , G11B5/09 , G11B15/02 , G11B15/05 , G11B15/07 , G11B15/087 , G11B20/00 , G11B20/10 , G11B27/34 , G11B27/36 , G11B33/10 , H04N5/928 , H04N9/79 , H04N9/797 , H04N9/802 , H04N9/835
摘要： PURPOSE:To reduce an error rate of a reproduced PCM audio signal by controlling a recording current fed to a rotary head to be an optimum value according to a type of a cassette tape and a recording format of the PCM audio signal in the case of recording the PCM audio signal. CONSTITUTION:A sensor 4 in the case of recording a PCM audio signal detects a type of a tape cassette as to whether the tape is a standard type coating (MP) tape, a metal vapor deposition (HGMP) tape or a vapor deposition (ME) tape based on an ID hole of the tape cassette and gives its sensing output to a system controller 3. Moreover, the user uses keys 5 to designate various modes of the VTR such as PCM audio recording mode as to whether the mode is an NRTML mode, an L mode or an N mode. Thus, the recording current fed to rotary heads 1A, 1B is controlled to be an optimum value automatically. Thus, an error rate of a reproduced PCM audio signal is minimized at reproduction.

66. 发明专利

JPH0413277A VTR 失效
公开(公告)号：JPH0413277A
公开(公告)日：1992-01-17
申请号：JP11326290
申请日：1990-04-28
申请人： SONY CORP
发明人： KOBAYASHI HIROSHI , TAKAHASHI TAKAO , MURABAYASHI NOBORU , KORI TERUHIKO
IPC分类号： H04N5/92 , G11B15/087 , G11B20/10 , G11B20/12 , G11B27/02 , G11B27/032 , G11B27/10 , G11B27/28 , G11B27/32
摘要： PURPOSE:To easily discriminate a still picture video signal which is not recorded normally by recording an ID signal showing the incompletion of recording. CONSTITUTION:A still picture signal processing circuit 17, a PCM processing circuit 19, an operation part 27, and a main CPU 28 are provided. When recording the other still picture video signal from halfway of one still picture screen recording under recording, the recording of the other still picture video signal is performed after recording the ID signal showing the incompletion of the recording of one still picture video signal before the recording of the other still picture video signals. Thus, the still picture video signal, which is not recorded normally, can easily be discriminated by simple construction.

67. 发明专利

JPH0380468A MAGNETIC RECORDER 失效
公开(公告)号：JPH0380468A
公开(公告)日：1991-04-05
申请号：JP21769989
申请日：1989-08-24
申请人： SONY CORP
发明人： MURABAYASHI NOBORU
IPC分类号： G11B20/10
摘要： PURPOSE:To restrain an error rate by mutually adding the signals of an I and a Q channel whose phases are modulated, obtaining a QPSK signal, detecting the combination of the bit strings of the I and the Q channel at the same time and correcting the phase of the QPSK signal. CONSTITUTION:The bit string from a register 81 is supplied to a detection circuit 91 and it is detected which combination the bit string belongs to. Then, the detection signal Sk is supplied to a correction circuit 93 as the control signal thereof. Besides, signals SI and SQ from multiplication circuits 83A and 83B are supplied to an amplitude detection circuit 92 and the amplitude ratio or the amplitude difference between the signal SI and SQ is detected. Then, the detection signal Sr is supplied to the correction circuit 93 as the control signal thereof. By the circuit 93, the phase phi of the QPSK signal Sq is controlled to the correct phase, that means, the phase of the integer multiple of pi/4 corre sponding to the bit string based on the signals Sk and Sr. Then, the QPSK signal Sq whose phase is corrected is supplied to a recording amplifier 25 after the amplitude thereof is corrected to a fixed value by an AGC amplifier 94.

68. 发明专利

JPH02282965A TRACKING DEVICE FOR REPRODUCTION OF THREE LAYER RECORDING SIGNAL 失效
公开(公告)号：JPH02282965A
公开(公告)日：1990-11-20
申请号：JP10519689
申请日：1989-04-25
申请人： SONY CORP
发明人： MURABAYASHI NOBORU
IPC分类号： G11B15/467
摘要： PURPOSE:To prevent a depth recording signal from being remarkably lowered by setting a tracking point for the reproduction of a recording medium between the optimum track point of each signal track on which depth recording is performed. CONSTITUTION:A PCM signal depth-recorded on the second layer of a magnetic tape 5 is reproduced by PCM heads 3a and 3b. Also, an AFM signal depth- recorded on the third layer of the tape 5 is reproduced by AFM heads 2a and 2b. In such constitution, tracking correction is performed so as to increase the reproducing output of depth-recorded AFM signal and PCM signal as far as possible. In other words, a system controller 32 decides a practical tracking point to trace the tape 5 actually based on peak detecting signals S1 and S2 supplied from peak detectors 22 and 31, respectively. Then, a correction signal S4 is generated, and is derived to a tracking circuit 35. In such a way, it is possible to prevent the reproducing S/N of the depth recording signal remarkably deteriorating.

69. 发明专利

JPH01312759A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH01312759A
公开(公告)日：1989-12-18
申请号：JP14494088
申请日：1988-06-13
申请人： SONY CORP
发明人： MURABAYASHI NOBORU , UETAKE AKIHIRO
IPC分类号： G11B15/467
摘要： PURPOSE:To simplify the circuit constitution without needing any pilot signal alike a 4-frequency pilot ATF system by using plural sets of head pairs with the same azimuth angles and a step difference so as to reproduce 2 fields or over at the same time and applying tracking so as to maximize the reproduced output for each field. CONSTITUTION:The 1st and 2nd heads (recording reproducing heads) 3A, 3B with a different azimuth angle are prepared and the 1st synchronizing pattern is recorded to first 2-track by using the 1st and 2nd heads and the 2nd synchronizing pattern is recorded to the succeeding 2-track by using the 1st and 2nd heads. In case of reproduction, the 3rd and 4th heads (tracking heads) 4A, 4B having a prescribed step difference such as 1 track pitch and different azimuth angle to those of the 1st and 2nd heads are prepared. Then the 1st and 3rd heads 3A, 4A are used as a couple of heads of the same azimuth angle and the 2nd and 4th heads 3B, 4B are used as a couple of heads of the same azimuth angle and the tracks for 2-field recorded by a couple of head pairs are reproduced at the same time.

70. 发明专利

JPH01179250A DIGITAL RECORDER 失效
公开(公告)号：JPH01179250A
公开(公告)日：1989-07-17
申请号：JP33227587
申请日：1987-12-29
申请人： SONY CORP
发明人： MURABAYASHI NOBORU
IPC分类号： G11B15/087 , G11B27/28
摘要： PURPOSE:To add a program searching function without providing a dedicated area for a program searching signal by making a program searching signal by inserting a pattern distinguishable from a data bit pattern into a synchronous signal section in a data array in place of a synchronizing pattern. CONSTITUTION:A data sync recording area AP1 is provided on one end part of a track to be recorded with a video signal. Then, a switch 6 is changed by the timing of AP1 so that a sync pattern is supplied from a fixed pattern generator 14. In addition, a switch 16 is changed whenever recording contents are changed, so that a sync fixing pattern for index is supplied from its generator 15 to be recorded to AP1. For this purpose, a code which is not used in a data changeover regulation is used. At the time of reproducing, a program searching bit pattern for the reproducing position is specified, and the pertinent pattern is detected from the synchronous signal section for the program searching position so that the reproducing is carried out from this position. By this method, a dedicated area for a program searching signal is omitted, and then the program searching function can hence be added.

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