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    • 10. 发明申请
    • PROCESS AND DEVICE FOR READING MAGNETICALLY RECORDED SIGNALS
    • 方法和设备读取磁记录的信号
    • WO1996031874A1
    • 1996-10-10
    • PCT/EP1996001059
    • 1996-03-13
    • AGFA-GEVAERT AGWEINERT, Volker
    • AGFA-GEVAERT AG
    • G11B05/02
    • G11B5/02
    • The invention is based on a process for reading magnetically recorded signals from a photographic film provided with a transparent thin magnetic layer. The signals from a magnetic reading head applied to the moving film are pre-amplified and the pre-amplified signals are evaluated. Signals capable of being read from transparent magnetic layers are likely to be at least two hundred times weaker than those from standard layers used for recording audio signals or computer data. The object of the invention is therefore to design a procedure suitable for reading extremely weak magnetic signals. This involves operating the magnetic reading head (2) through the pre-amplifier in short-circuit. This means that the internal resistance Ri of the magnetic head is very high compared to the input resistance Re of the amplifier connected immediately downstream of the magnetic head coil.
    • 本发明涉及一种方法,用于从一设置有透明的薄磁性层的照相胶片,其中的按压移动的薄膜磁读取头的信号被前置放大和前置放大信号被评估读取磁存储的信号。 从透明的磁性层可读很可能至少由200比常规层中的用于记录音频或计算机数据的一个因素是较弱的信号。 因此,本发明的目的是提供一种适合于读出极弱的磁信号的过程的形式。 这里,读出磁头(2)由前置放大器(5)在短路操作。 用于操作通过在短路操作中的前置放大器的磁读取头,相比于重新磁头线圈放大器的直接下游的输入电阻磁头的内部电阻R 1是非常大的。