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61. 发明专利

JPH05316356A PICTURE SIGNAL DECODER 失效
公开(公告)号：JPH05316356A
公开(公告)日：1993-11-26
申请号：JP12024692
申请日：1992-05-13
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KIMURA MARI , KATO MISAO , MOTOTANI KUNIHIKO , AMANO YOSHINORI
IPC分类号： H03M7/30 , G06T9/00 , H04N1/41 , H04N19/117 , H04N19/134 , H04N19/136 , H04N19/176 , H04N19/182 , H04N19/196 , H04N19/423 , H04N19/44 , H04N19/48 , H04N19/60 , H04N19/625 , H04N19/80 , H04N19/86 , G06F15/66 , H04N7/133
摘要： PURPOSE:To eliminate block distortion without causing visual fog by applying smoothing processing to data only at a flat area with less density change and storing data with a steep density change including edge information or the like without smoothing processing. CONSTITUTION:Picture coding data are inputted to a decoding circuit 1, in which the data are decoded for each block, orthogonal transformation data in a block memory 2 are subject to inverse orthogonal conversion by en inverse orthogonal transformation circuit 3 and decoded into a picture signal and written in a frame memory 4 one by one block each. On the other hand, a DC component of the decoded orthogonal transformation data is sent to a Dc component storage memory 5, in which the DC component is stored. The DC component of each block is stored in a DC component storage memory 5, in which addressing is made in 2-dimension, a DC difference circuit 6 detects a difference with a DC component of an adjacent block, and a smoothing arithmetic operation ON/OFF discrimination circuit 7 compares the difference with a prescribed value. An address generating circuit 8 generates an address of a picture element applied with smoothing arithmetic operation and sends an object picture element to a smoothing arithmetic operation circuit 9.

62. 发明专利

JPH0519207B2 失效
公开(公告)号：JPH0519207B2
公开(公告)日：1993-03-16
申请号：JP11000384
申请日：1984-05-30
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KANAMARU SHUNJI , MOTOTANI KUNIHIKO , OKAMURA HIDEO
IPC分类号： G11B7/00 , G11B7/0037 , G11B7/004

63. 发明专利

JPH03186083A SIGNAL REPRODUCING DEVICE 失效
公开(公告)号：JPH03186083A
公开(公告)日：1991-08-14
申请号：JP32633289
申请日：1989-12-15
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： HONJO MASAHIRO , TANIGUCHI HIROSHI , MOTOTANI KUNIHIKO
IPC分类号： H04N5/922 , H04N5/92 , H04N5/93 , H04N9/82 , H04N9/83
摘要： PURPOSE:To eliminate cross modulation disturbance in an excellent way by subtracting a voice modulation signal or the like from a demodulated video signal and detecting a remaining 2nd modulation component in an output signal of a subtraction circuit when the cross modulation disturbance is relieved so as to adjust the subtraction level. CONSTITUTION:A reproduction FM signal (a) from an input terminal 1 passes through a high pass filter HPF 7, FM-demodulated at an FM demodulation circuit 2 and a signal (b) is obtained. On the other hand, a band pass filter BPF 4 separates a 2nd modulation wave, i.e. a voice modulation signal (c) or the like from the signal (a), a signal (d) adjusted to an optimum gain by a gain adjustment circuit 5 with information of a detection circuit 6 is subtracted from the demodulation signal (b) by a subtraction circuit 3 and an obtained signal (e) is outputted as a demodulation signal. The detection circuit 6 detects the cross modulation component included in the output signal (e) of the subtraction circuit 3 with the output signal (c) of the BPF 4 accurately to control the gain adjustment circuit 5. Thus, the cross modulation component in existence in the demodulation signal (e) is eliminated in an excellent way.

64. 发明专利

JPH033119A OPTICAL DISK DEVICE 失效
公开(公告)号：JPH033119A
公开(公告)日：1991-01-09
申请号：JP13846189
申请日：1989-05-31
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KIMURA MARI , KOISHI KENJI , INOUE TAKASHI , MOTOTANI KUNIHIKO
IPC分类号： G11B7/00 , G11B7/004 , G11B7/0055 , G11B7/085
摘要： PURPOSE:To prevent noise from being recorded or a recording signal from being erased under an idle state that recording, erasing or reproduction is not executed by positioning the focal point of fine spot light to a position which is separated from the surface of a disk under the idle state. CONSTITUTION:When either of control instructions which show a reproducing state and a recording state is inputted to a NOR circuit 18 from a CPU for controlling 17, a switch 19 is opened and an offset voltage from an offset voltage generator 20 is not added to a focus error signal which is the output of a focus detection circuit 21. On the other hand, under the idle state that it is not the reproducing state nor the recording state, the switch 19 is closed by the output of the NOR circuit 18 and the offset voltage is added to the focus error signal. Thus, a focus control signal is sent to the focus actuator 8 of an optical head A from a focus control circuit 23 and the focal point of the fine spot light becomes a defocus state that it is positioned forward or backward the surface of the disk.

65. 发明专利

JPH026274B2 失效
公开(公告)号：JPH026274B2
公开(公告)日：1990-02-08
申请号：JP4839880
申请日：1980-04-11
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TSUJIHARA SUSUMU , MORITA KATSUMI , MOTOTANI KUNIHIKO , TAKEDA MINORU
IPC分类号： G09G5/08 , H04N9/28

66. 发明专利

JPH0133992B2 失效
公开(公告)号：JPH0133992B2
公开(公告)日：1989-07-17
申请号：JP11457480
申请日：1980-08-19
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TAKEMURA YOSHA , MOTOTANI KUNIHIKO
IPC分类号： H04N7/32

67. 发明专利

JPS6430024A METHOD FOR DESTRUCTING DATA STORED IN OPTICAL DISK 失效
公开(公告)号：JPS6430024A
公开(公告)日：1989-01-31
申请号：JP18618587
申请日：1987-07-24
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： MOTOTANI KUNIHIKO , INOUE TAKASHI
IPC分类号： G11B7/00 , G11B7/0055
摘要： PURPOSE:To shorten time for destructing data and to prevent the generation of environmental pollution by optically roughing the surface of plastic or the like used for the base material of an optical disk to disable data stored in the disk from being read out. CONSTITUTION:A jig 6 for roughing the surface of the optical disk 1 is constituted of a material, e.g. a file, for roughing the surface of the base material of the optical disk 1 made of plastic or the like stuck to a base 8. The jig 6 for roughing the surface of the optical disk 1 is inserted from a window 3 into a cartridge 2, and while contacting the jig 6 with the surface of the disk 1, the disk 1 is rotated to rough the surface of the disk 1. Since laser beams radiated to a recording film 4 in order to reproduce data are dispersed on the surface of the disk 1, the data can not be read out. Consequently, data can be disabled from being read out within a short time and a method for mechanically destructing the optical disk 1 is adopted to prevent the generation of a pollution problem.

68. 发明专利

JPS62170035A SEMICONDUCTOR LASER DRIVE CIRCUIT 失效
公开(公告)号：JPS62170035A
公开(公告)日：1987-07-27
申请号：JP1131686
申请日：1986-01-22
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KOISHI KENJI , MOTOTANI KUNIHIKO
IPC分类号： G11B7/125
摘要： PURPOSE:To stabilize reproduced light and to drive semiconductor laser by stable recording power by switching the time constant of a control system at the time of recording and reproduction. CONSTITUTION:The reproduced light from a pin diode 2 is subject to current/ voltage conversion by a broad and operational amplifier 11 and inputted to an operational amplifier 3 as a control error voltage, its output is compared with a reference voltage 13 and the result is fed to a drive transistor 17. Then a DC current flows to the semiconductor laser 1, which is radiated at the reproduced light level. The frequency response of the control system is lowered depending on time constants 18-20. On the other hand, a recording signal 5 modulates the light of the laser 1 directly. The frequency response of the control system in such a case is quickened by the time constants 18, 19. In such a case, the recording gate signal 2 for the changeover of the time constant is turned on earlier than the power setting changeover and the high speed response is attained when the power setting is switched by a recording gate signal 1 in advance.

69. 发明专利

JPS62170026A OPTICAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS62170026A
公开(公告)日：1987-07-27
申请号：JP1081786
申请日：1986-01-21
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： INOUE TAKASHI , OKAMURA HIDEO , MOTOTANI KUNIHIKO
IPC分类号： G11B7/00 , G11B7/004 , G11B7/0055
摘要： PURPOSE:To record and reproduce a delete signal stably for a long time with simplified constitution by recording plural delete signals while the intensity of laser light is being changed and detecting one of the signals at the reproduction. CONSTITUTION:A laser light intensity control circuit 10 for delete signal applies a constant voltage to a semiconductor laser drive circuit 11. In the delete operation, the control circuit 10 changes the voltage fed to the drive circuit 11 stepwise from low to high and high to low corresponding to each delete signal. The drive circuit 11 records the delete signal in the intensity corresponding to the voltage. As a result, at last on of plural delete signals is recorded at the optimum intensity. Then at the time of reproduction, when at least a pattern of one delete signal is detected by a signal processing circuit 13, the recording/ reproduction of a signal in the recording field is inhibited.

70. 发明专利

JPS6214380A OPTICAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS6214380A
公开(公告)日：1987-01-22
申请号：JP15456685
申请日：1985-07-12
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KIMURA MARI , KANAMARU SHUNJI , MOTOTANI KUNIHIKO , OKAMURA HIDEO
IPC分类号： G11B20/10 , G11B7/00 , G11B7/005
摘要： PURPOSE:To reduce a reading error by comparing output signals of a waveform equalizer with reference voltages respectively generated so as to be different in level, making binary to obtain plural pulse trains and demodulate, and selecting the correctly demodulated pulse train. CONSTITUTION:A reproducing signal from an optical disk outputted from a preamplifier 9 has a frequency characteristic of an amplitude in an optical recording and reproducing system corrected by a waveform equalizer and the output signal of the waveform equalizer 14 is impedance converted by a transistor 15 and inputted to an envelope detecting circuit. The fine control of a reference voltage can be performed, the generated reference voltages are respectively inputted to voltage comparators of 21a-21c to be compared in voltage with the output A of the waveform equalizer and made binary and encoded. A recording signal is demodulated by decoders of 11a-11c, read by error detectors 23a-23c to detect the error, and a demodulated signal having no error detection is selected by a signal selector 24. Thereby, a clock component can be stably detected and the reading errors can be reduced.

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