公开(公告)号：US3863265A

公开(公告)日：1975-01-28

申请号：US33094173

申请日：1973-02-09

Applicant: SYCOR INC

Inventor： KLUMPP MARLIN K

IPC: G11B27/032 ,  G11B27/036 ,  G11B27/22 ,  G11B5/02

CPC classification number: G11B27/036 ,  G11B27/032

Abstract: A threshold detector is coupled to a ''''write'''' head in a recording apparatus to detect the leading edge of the first transition of previously recorded data and provide a control signal therefrom. A control circuit coupled to the threshold detector switches the recording apparatus to the ''''write'''' or recording mode of operation immediately upon the detection of the predetermined threshold voltage from the write head so that the same head then immediately switches its operation and operates to record new data information directly and accurately over the previously recorded data. By utilizing this method, new records can automatically be inserted accurately in a particular segment of a previously recorded tape, such as in a recording format for digital information which employs segments of recorded information as discreet records, with an inter-record gap between each record, with each record including a preamble immediately followed by the data information.

Abstract translation: 阈值检测器耦合到记录装置中的“写入”头，以检测先前记录的数据的第一次转换的前沿并从其提供控制信号。 耦合到阈值检测器的控制电路在从写入头检测到预定阈值电压时立即将记录装置切换到“写入”或记录操作模式，使得相同的头然后立即切换其操作并操作以记录新的 数据信息直接和准确地超过先前记录的数据。 通过利用这种方法，可以将新记录自动地准确地插入先前记录的磁带的特定段中，例如以记录信息段作为谨慎记录的数字信息的记录格式，每个记录之间具有记录间间隙 其中每个记录包括紧接在数据信息之后的前导序列。

公开(公告)号：US3895277A

公开(公告)日：1975-07-15

申请号：US36347673

申请日：1973-05-24

Applicant: SYCOR INC

Inventor： KLUMPP MARLIN K

IPC: G11B15/48 ,  H02P3/10 ,  H02P3/20

CPC classification number: G11B15/48 ,  H02P3/10

Abstract: For use in a tape transport including a drive motor for transporting tape across a recording or playback head, and a motor drive circuit for selectively applying drive current to the motor, an electrical circuit for applying a reverse drive current to the motor for rapidly reducing the speed of the drive motor upon the receipt of a stop signal. The circuit provides controlled reverse current to the drive motor over a period of time initiated by a stop signal and extending until a predetermined reduced speed is reached after which the reverse drive signal is removed and the motor allowed to coast to a halt.

Abstract translation: 对于包括用于在记录或重放头上传送带的驱动电动机的磁带传送和用于选择性地向电动机施加驱动电流的电机驱动电路，用于向电动机施加反向驱动电流以快速减少 在接收到停止信号时驱动电机的速度。 该电路在由停止信号启动的一段时间内向驱动电动机提供受控的反向电流，并延伸直到达到预定的降低的速度，之后去除反向驱动信号并使电动机惯性停止。