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1. 发明专利

JPS60668A DIGITAL SIGNAL RECORDING CIRCUIT 失效
公开(公告)号：JPS60668A
公开(公告)日：1985-01-05
申请号：JP10788383
申请日：1983-06-17
申请人： HITACHI LTD , HITACHI ELECTRONICS
发明人： ROKUTA MORIHITO , MITA SEIICHI , IZUMIDA MORIJI , KOUNOUE AKIHIKO , FUJIMURA NOBUROU , TAKAGI HITOSHI , SHIONO HIROSHI , KANEDA HIDEHIRO
IPC分类号： G11B20/14
摘要： PURPOSE:To constitute a code with less consecutive ''0'' and without a DC component by providing a block conversion so as to reduce the consecutive ''0'' or ''1'' and adding a redundancy so as to eliminate the DC component and low frequency component. CONSTITUTION:Suppose that a data D1 in 16-bit is inputted to a serial parallel converting circuit 210, the data of first 8-bit in 16 bits is subject to NRZI conversion by using ''0'' as a redundancy bit at an ROM converting circuit 211 and the data 9-bit and the 4-bit binary-coding the weight information of the data is outoutped. Further, the data in latter 8-bit is processed similarly in an ROM converting circuit 212. The weight 4-bit outputted from the two ROM converting circuits 211 and 212 is added at a weight adder 214 and the outputted data becomes the weight 5-bit to the input data 16-bit. The weight 5-bit of the converted data and a DSV 5-bit are added at a weight accumulating value operating circuit 215 and when the inverting information is outputted, the waveform of E1 is inverted into the waveform of E2 so as to form a final data.

2. 发明专利

JPS59185016A Preamplifier circuit 失效
标题翻译：前置放大器电路
公开(公告)号：JPS59185016A
公开(公告)日：1984-10-20
申请号：JP5500883
申请日：1983-04-01
申请人： Hitachi Denshi Ltd , Hitachi Ltd
发明人： KOUNOUE AKIHIKO , MITA SEIICHI , FUJIMURA NOBUROU , IZUMIDA MORIJI
IPC分类号： G11B5/027 , G11B5/035
CPC分类号： G11B5/035
摘要： PURPOSE:To keep continuously the resonance frequency and the transmission characteristic of a preamplifier constant by providing a varator element and a check signal generating circuit to an input terminal of a preamplifier circuit, and converting the output of a check signal into a DC voltage to apply its signal to the varactor element. CONSTITUTION:An f1 of an oscillator 1 of a resonance frequency and an f2 of a low frequency oscillator 2 changing sinusoidally the capacitance of the varactor element are provided. A signal of the f1 is amplified by the varactor element Cv and the preamplifier 3 and detected through a detector 4 via a switch 9. A signal is extracted from a terminal 10 by the switch 9 in not inspection. The detected signal passes through a band pass filter (B.P.F) 5 extracting the signal of the f2 only and a signal being the product by multiplying by the signal f2 is formed. This signal is converted into a DC voltage through a low pass filter (L.P.F) 7 and applied to the varator element via a differential amplifier together with the signal of the f2.
摘要翻译：目的：通过向前置放大器电路的输入端提供变倍元件和校验信号发生电路，连续保持前置放大器的谐振频率和传输特性，并将检查信号的输出转换为直流电压，以应用其信号到变容二极管元件。构成：提供谐振频率的振荡器1的f1和低频振荡器2的f2，其正弦改变变容二极管元件的电容。 f1的信号由变容二极管元件Cv和前置放大器3放大，并通过开关9通过检测器4进行检测。在不检查的情况下，开关9从端子10提取信号。检测到的信号通过仅提取f2的信号的带通滤波器（B.P.F）5，并且形成通过乘以信号f2的乘积的信号。该信号通过低通滤波器（L.P.F）7转换为直流电压，并通过差分放大器与f2的信号一起施加到变倍元件。

3. 发明专利

JPS58205924A Automatic tracking device 失效
标题翻译：自动跟踪装置
公开(公告)号：JPS58205924A
公开(公告)日：1983-12-01
申请号：JP8667682
申请日：1982-05-24
申请人： Hitachi Denshi Ltd , Hitachi Ltd
发明人： MITA SEIICHI , IZUMIDA MORIJI , KOUNOUE AKIHIKO , FUJIMURA NOBUROU , SHINODA YUKIO
IPC分类号： H04N5/7826 , G05D3/12 , G11B5/588 , G11B21/10
CPC分类号： G11B21/10
摘要： PURPOSE:To attain simple and accurate tracking, by providing a track width larger than a track tracing width and controlling a tracking shift in response to an output difference between two heads where the track tracing is arranged at adjacent positions. CONSTITUTION:In the just tracking state of reproducing heads A, B having a large track width, one end of both head sections is located at the boundary of track tracing, and the other end is located at a position apart from the respective main track by a broader share of the track width. The azimuth angle of the head A is defined as the same direction as the 2nd channel on a track tracing and that of the head B is defined the same direction as the 3rd channel. If a tracking shift takes place, the amplitude value of a reproducing output signal of the heads A, B is changed. Thus, in taking the output difference of both the heads, this difference corresponds to the tracking shift amount. In controlling the output difference so as to be zero at all times in this way, the just tracking state is continued.
摘要翻译：目的：为了获得简单而准确的跟踪，通过提供大于轨道跟踪宽度的轨道宽度，并响应于在相邻位置处布置轨道跟踪的两个头部之间的输出差异来控制跟踪移位。构成：在具有大轨道宽度的再现头A，B的正常跟踪状态下，两个头部的一端位于轨道跟踪的边界处，另一端位于远离相应主轨道的位置，更大份额的轨道宽度。头A的方位角被定义为与轨道跟踪上的第二通道相同的方向，并且将头B的方位角定义为与第三通道相同的方向。如果发生跟踪偏移，则头A，B的再现输出信号的振幅值改变。因此，在获取两个磁头的输出差时，该差异对应于跟踪偏移量。在这样控制输出差为零的情况下，继续保持正常的跟踪状态。

4. 发明专利

JPS59144014A Waveform equarizing system of magnetic recording or reproducing system 失效
标题翻译：磁记录或复制系统的波形均衡系统
公开(公告)号：JPS59144014A
公开(公告)日：1984-08-17
申请号：JP1754883
申请日：1983-02-07
申请人： Hitachi Denshi Ltd , Hitachi Ltd
发明人： MITA SEIICHI , IZUMIDA MORIJI , KOUNOUE AKIHIKO , FUJIMURA NOBUROU , TAKAGI HITOSHI
IPC分类号： H04B3/06 , G11B20/10 , G11B20/16 , H04L25/03
CPC分类号： G11B20/10009
摘要： PURPOSE:To improve greatly the code error factor by equalizing selectively the wave to be interfered and making use of a fact that a waveform having large interference between codes and a normal waveform within the original allowable value are mixed into a time variance component in terms of time. CONSTITUTION:Waveform compensating circuits 2 and 4 use transversal filters containing delay lines 6 and 7 or 17 and 18, attenuators 8 and 9 or 19 and 20, and an adder 10 or 21. The amount of compensation of the frequency characteristics is decided from the amounts of delay and addition. An amplitude controller 3 consists of buffer amplifiers 12 and 13, diodes 14 and 15, and attenuators 11 and 16. A variable attenuator 11 controls the amplitude applied to a pair of diodes, and therefore the threshold level can be set freely. For instance, the output voltage of the amplifier 12 is set at 2V and therefore it is possible to give compensation to a signal having the total reduction of amplitude by 6dB as long as a Schottky diode is used. As a result, the code error factor can be greatly improved.
摘要翻译：目的：通过选择性地平衡待干扰的波并利用以下事实来改善代码误差因子：使代码之间的干扰大，原始允许值内的正常波形的波形被混合成时间方差分量时间。构成：波形补偿电路2和4使用包含延迟线6和7或17和18，衰减器8和9或19和20以及加法器10或21的横向滤波器。频率特性的补偿量由延迟和增加的数量。振幅控制器3包括缓冲放大器12和13，二极管14和15以及衰减器11和16.可变衰减器11控制施加到一对二极管上的振幅，因此可以自由设定阈值电平。例如，放大器12的输出电压设定为2V，因此只要使用肖特基二极管，就可以对振幅总减小6dB的信号进行补偿。结果，代码误差因子可以大大提高。

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