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1. 发明专利

JPH11161924A MAGNETIC RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JPH11161924A
公开(公告)日：1999-06-18
申请号：JP26912098
申请日：1998-09-24
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KATAOKA KAZUHIRO , KASE TSUTOMU
IPC分类号： G11B5/455
摘要： PROBLEM TO BE SOLVED: To provide a magnetic recording/reproducing device reducing power consumption at a recording time. SOLUTION: A power source control circuit 19 turns respective power sources of a reproducing amplifier circuit 15, a detection circuit 16 and a comparator 17 on/off based on a setting value 8 of a detection period of a setting value memory of detection period 20. The 9a-9c are power source lines controlled with on/off. By controlling the operation of the circuit related to clogging detection of a magnetic head, bite clogging detection of the magnetic head is performed intermittently.

2. 发明专利

JP2558677B2 失效
公开(公告)号：JP2558677B2
公开(公告)日：1996-11-27
申请号：JP3608687
申请日：1987-02-19
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KATAOKA KAZUHIRO , USUKI NAOJI
IPC分类号： H04N5/93 , H04N5/907 , H04N5/937

3. 发明专利

JPS612480A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS612480A
公开(公告)日：1986-01-08
申请号：JP12302384
申请日：1984-06-15
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： IWAI TOSHIO , KITAMURA SADAFUMI , BABA TASUKU , KATAOKA KAZUHIRO
IPC分类号： G11B5/588 , G11B15/467 , H04N5/93
摘要： PURPOSE:To attain stable mode shifting from stop to reproduction independently of the existence of an input by applying a false synchronizing signal to a color circuit at the shift of the mode. CONSTITUTION:A switch 24 supplies a false synchronizing signal outputted from a false synchronizing signal generating circuit 25 to a color circuit only at the mode shifting from stop state to the reproducing mode. The circuit 25 can be easily formed by two monostable multivibrators e.g. The switching timing of the switch 24 is obtained by applying the false synchronizing signal to the color circuit during the period from the depression of a reproducing button to the switching of a switch 5 to V-V. Since a circuit for removing an equivalent pulse of a normally vertical synchronizing signal part is included in the color circuit, the flase synchronizing signal may be integer times the horizontal synchronizing frequency. Consequently, the false synchronizing signal can be used by setting up the oscillation frequency of a switching power supply or the clock frequency of a microcomputer in a system control part properly.

4. 发明专利

JPS62289077A MAGNETIC RECODING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS62289077A
公开(公告)日：1987-12-15
申请号：JP13331086
申请日：1986-06-09
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KATAOKA KAZUHIRO
IPC分类号： G11B5/027 , H04N5/93
摘要： PURPOSE:To maintain a well-balanced output from an FM equalizer by inserting a reference signal into a video signal so as to record it, detecting it at the time of reproduction and adjusting the frequency characteristic of an FM equalizer circuit. CONSTITUTION:At the time of recording, a gate circuit 10 gates the output of a reference signal generator circuit 9 with the aid of the output of a logic circuit 4, and an adder 13 inserts the reference signal into a video signal input 1. Upper and lower band level detection signals arise in the output spectrum of an FM modulator circuit 2. At the time of reproduction, a band-pass filter BPF 21 passes only an upper side band frequency, while a BPF 22 passes through only a lower side band frequency. A reproduction video signal is supplied to a logic circuit 4 from a demodulator circuit 20. A sample holding circuit 26 sample-holds the output of a level difference detection circuit 25 at a timing when the reference signal is inserted at the time of recording. The FM equalizer circuit 18 varies its frequency characteristic in accordance with a feedback level, and the output of a head amplifier 16 is well balanced.

5. 发明专利

JPS6194203A Rotary erasion head device 失效
标题翻译：旋转擦拭头设备
公开(公告)号：JPS6194203A
公开(公告)日：1986-05-13
申请号：JP21540284
申请日：1984-10-15
申请人： Matsushita Electric Ind Co Ltd
发明人： KATAOKA KAZUHIRO
IPC分类号： G11B5/024
CPC分类号： G11B5/024
摘要： PURPOSE:To obtain a rotary erasion head device having small power consumption by flowing an erasion current only in a period when an erasion head has a contact with a magnetic tape and also switching the erasion current according to the type of the using tape. CONSTITUTION:A magnetic tape is wound round a rotary cylinder at about 221 deg., and two heads A and B are set on a rotary head cylinder 2. Then a rotary erasion head E is set at a position which is ahead of the head A by theta in the revolving direction. The erasion current is flowed only in a period when the head E has a contact with a magnetic tape in order to reduce the electric power needed for erasion. Thus the power consumption is defined as 221 deg./360 deg.=0.16, i.e., the power consumption can be reduced down to about 60%. The current flowing timing to the head E is decided by a PG pulse which detects the rotary phase of the rotary cylinder. When the control pulse for erasion current is applied to a terminal 3, a switching transistor 4 is turned off and on when the pulse input is kept at high and low levels respectively. Then the erasion current flows only in a period of about 221 deg. when the rotary erasion head 2 has a contact with the magnetic tape.
摘要翻译：目的：通过仅在擦除头与磁带接触的时间段内流过擦除电流而获得具有较小功耗的旋转擦除头装置，并根据使用带的类型切换擦除电流。构成：将磁带缠绕在旋转圆筒上约221度，并在旋转磁头气缸2上设置两个磁头A和B.然后旋转磨损磁头E设置在磁头A前面的位置通过θ在旋转方向。只有在磁头E与磁带接触的时间段内才能流过该电流，以便减少所需的电力。因此功耗被定义为221度-360度= 0.16，即功率消耗可以降低到大约60％。通过检测旋转圆筒的旋转相位的PG脉冲来确定到头部E的电流流动正时。当将漏电流的控制脉冲施加到端子3时，分别将脉冲输入保持在高电平和低电平时，开关晶体管4截止并接通。然后，侵蚀电流仅在约221度的时间内流动。当旋转磨损头2与磁带接触时。

6. 发明专利

JPH06131638A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH06131638A
公开(公告)日：1994-05-13
申请号：JP27987092
申请日：1992-10-19
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KATAOKA KAZUHIRO , HASHIMOTO TOSHIYUKI
IPC分类号： G11B5/455
摘要： PURPOSE:To detect the clogging on a magnetic head at the time of stopping the running of a magnetic tape. CONSTITUTION:A magnetic recording and reproducing device is constituted of a system controller 1 controlling the system, a drive control part 2 controlling the running of the tape and a clogging detection device 3 detecting the clogging on the magnetic head. A circuit is simplified remarkably and a cost is reduced since the clogging on the magnetic head is detected at a recording time without using a recording/reproducing simultaneous head by detecting the clogging on the magnetic head at the time of stopping the running of the magnetic tape after recording is ended.

7. 发明专利

JPH02184767A METER DRIVING CIRCUIT 失效
公开(公告)号：JPH02184767A
公开(公告)日：1990-07-19
申请号：JP453789
申请日：1989-01-11
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KATAOKA KAZUHIRO , TSUTSUI KUNIO
IPC分类号： G01R19/00 , H03G1/00
摘要： PURPOSE:To change an output signal non-linearly against an input signal by providing switching means and input/output level ratio varying means. CONSTITUTION:Threshold voltage setting means I to set at least one threshold voltage, switching means II whereby an ON/OFF condition is inverted when the input signal level is elevated over the threshold voltage, and input/output level ratio varying means III to change over the ratio of output signal level to input signal level with at least two steps in accordance with the inversion of ON/OFF condition in the means II, are provided. The ON/OFF condition in the means II is inversed according to the time when the input signal is lower or higher than the threshold voltage. As a result, the ratio of output signal level to input signal level is changed over according to the time when the input signal is lower or higher than the threshold voltage. The output signal can be changed non-linearly against the input signal accordingly.

8. 发明专利

JPS63151280A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS63151280A
公开(公告)日：1988-06-23
申请号：JP29950986
申请日：1986-12-16
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KATAOKA KAZUHIRO
IPC分类号： H04N5/92
摘要： PURPOSE:To make it possible to record/record video signals in plural channels by changing the number of revolution of a drum and time base compression at the time of recording so that all the video signals in plural channels are recorded on a tape, and executing the time base elongating only a desired video signal component at the time of reproducing. CONSTITUTION:In a field memory (b) 22, only, the odd-number fields of the second video signals are written. A vertical synchronizing signal 10 whose time base is 1/2-compressed are read with a clock whose rate is double that for reading. In the result, the time base compressed signal is obtained in an output 24. At the time of reproducing, a signal detected by a magnetic head 31 is amplified by a reproduction amplifier 33, and lead to the P-side of a switch 14. A vertical synchronizing signal is frequency divided by half in a memory control circuit (B) 17 to generate pulse signals. The generated signal is made a write signal for writing in a memory to determine which of a first video signal or a second video signal should be selected and reproduced.

9. 发明专利

JPS6193793A Magnetic recording method 失效
标题翻译：磁记录方法
公开(公告)号：JPS6193793A
公开(公告)日：1986-05-12
申请号：JP21455184
申请日：1984-10-12
申请人： Matsushita Electric Ind Co Ltd
发明人： KATAOKA KAZUHIRO , KITAMURA SADAFUMI , BABA TASUKU , IWAI TOSHIO
IPC分类号： G11B20/02 , G11B5/027 , H04N9/79 , H04N9/80
摘要： PURPOSE: To prevent color noises at overlapped part in case of joint pickup of a fade-out and a fade-in video signal by recording a color burst while suppressing the recording level of the burst during the period of fade-out.
CONSTITUTION: A low frequency conversion color signal inputted from a terminal 21 is mixed with a luminance FM signal 25 by a transistor (TR)28 via an LPF22 and TRs 26, 27 and fed to a recording amplifier circuit 29. In recording a fade-out video signal, a signal shown in figure is fed to a fade-out control signal input 23 and when the value of the bias resistor 24 is selected so as to turn on the TR29 with a DC level of the control signal exceeding a point B, the TR29 is turned on during the period B∼C and a color signal is not obtained as the output of the TR27. Thus, the overlapped write of the color burst signal in recording the fade-out video signal is prevented, and color noise generation is suppressed at fade-out and fade-in joint pickup recording.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：通过在淡出期间抑制突发的记录水平，通过记录色同步信号来防止在淡出和淡入视频信号的联合拾取的情况下重叠部分处的颜色噪声。构成：从端子21输入的低频转换色信号通过晶体管（TR）28经由LPF22和TRs 26,27与亮度FM信号25混合，并馈送到记录放大器电路29。输出视频信号，图中所示的信号被馈送到淡出控制信号输入23，并且当选择偏置电阻器24的值以使控制信号的DC电平超过点B的TR29导通时，在BC期间TR29导通，并且没有获得作为TR27的输出的彩色信号。因此，防止在记录淡出视频信号中重叠写入彩色同步信号，并且在淡出和淡入联合拾取记录时抑制色噪声产生。

10. 发明专利

JPS59149487A Magnetic video recording and reproducing device 失效
标题翻译：磁性录像和再现设备
公开(公告)号：JPS59149487A
公开(公告)日：1984-08-27
申请号：JP2400983
申请日：1983-02-15
申请人： Matsushita Electric Ind Co Ltd
发明人： KITAMURA SADAFUMI , BABA TASUKU , KATAOKA KAZUHIRO
IPC分类号： H04N5/93 , G11B20/06 , H04N9/802 , H04N9/82 , H04N9/83
CPC分类号： H04N9/8222
摘要： PURPOSE:To improve the reproduction S/N ratio of an audio FM signal by providing a band limiting circuit for the upper-side-band wave of a luminance FM signal to be recorded. CONSTITUTION:The band limiting circuit 35 is provided for the upper-side-band wave of the luminance FM signal to be recorded, and when it is recorded while mixed with the audio FM signal, no energy is present in the upper-side-band wave even if a tape head system restores the low-side-band wave. Therefore, the mixing of the side-band wave of the luminance FM signal into the band occupied by the audio FM signal is prevented.
摘要翻译：目的：通过提供要记录的亮度FM信号的上侧波段的频带限制电路来提高音频FM信号的再现S / N比。构成：为了记录亮度FM信号的上侧波段而设置频带限制电路35，在与音频FM信号混合时记录的情况下，在上侧波段不存在能量即使磁头系统恢复低边带波。因此，防止将亮度FM信号的边带波混合到由音频FM信号占据的频带。

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