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    • 8. 发明授权
    • Device for detecting the presence of recorded information on a magnetic
film by comparing an envelope waveform with a threshold level
    • 用于通过将包络波形与阈值水平进行比较来检测磁性膜上记录信息的存在的装置
    • US6026249A
    • 2000-02-15
    • US940776
    • 1997-09-30
    • Wataru SasakiMinoru IshiguroAkihiko Funaki
    • Wataru SasakiMinoru IshiguroAkihiko Funaki
    • G03B17/24G11B5/02G11B27/22G11B27/24
    • G03B17/24G11B27/22G11B27/24G03B2217/244G11B5/02
    • A camera which includes a recording unit for recording photographic information in a record area on a magnetic layer of a photographic film for each exposed frame, and a regenerating unit for scanning the magnetic layer to determine the presence or absence of the recorded information. The regenerating unit includes a magnetic head for scanning the magnetic layer and generating a corresponding signal, an amplification circuit for amplifying the signal generated by the magnetic head, a smoothing circuit for obtaining an envelope waveformn, and a magnetic information detecting circuit for determining whether magnetic information is recorded in the magnetic record area for each frame on the photographic film by sampling the voltage level of the signals output from the smoothing circuit a plurality of times, integrating or averaging the sampled voltage levels, and comparing the integrated or averaged sampled voltage levels with a reference voltage. The magnetic head has a small number of coils sufficient for detecting the presence of recorded information, but insufficient for accurately reproducing the recorded information.
    • 一种照相机,包括:记录单元,用于在每个曝光帧的摄影胶片的磁性层上的记录区域中记录照相信息;以及再生单元,用于扫描磁性层以确定是否存在所记录的信息。 再生单元包括用于扫描磁层并产生相应信号的磁头,用于放大由磁头产生的信号的放大电路,用于获得包络波形的平滑电路,以及用于确定磁性的磁信息检测电路 通过对从平滑电路输出的信号的电压电平进行多次采样,对采集的电压电平进行积分或平均,并将积分或平均的采样电压电平进行比较,将信息记录在摄影胶片上的每个帧的磁记录区域中 具有参考电压。 磁头具有足以检测记录信息的存在的少量线圈,但不足以准确地再现所记录的信息。