Automatic Correction of Timing Errors in Magnetic Tape Recorders

W. Hannan, J. Schanne, D. J. Woywood
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引用次数: 13

Abstract

A basic problem in magnetic recording is the preservation of accurate time relationships between reproduced bits of information. If information is recorded at a given rate, the reproduced signal rate will tend to deviate from this rate. Servo systems for controlling the mechanisms of the machine can maintain the reproduced signal rate equal to the recorded signal rate, averaged over a period of a few milliseconds. Mechanical servos cannot, however, prevent short-term deviations in reproduced signal rate, because of their relatively slow response. Electronically variable delay lines (EVDLs) have been developed which, because of their relatively fast response, can further reduce timing errors. This paper presents a mathematical analysis of the problem and of the requirements imposed on the EVDLs. Two devices for the accomplishment of electronically variable delay are then described, one for high-frequency signals, and one for low-frequency signals. Experimental results obtained by using these two delay lines are also presented.
磁带录音机定时误差的自动校正
磁记录的一个基本问题是在再现的信息位之间保持准确的时间关系。如果以给定的速率记录信息,则再现信号的速率将倾向于偏离该速率。用于控制机器机构的伺服系统可以在几毫秒的时间内保持再现信号速率等于记录信号速率的平均值。然而,由于机械伺服系统的响应速度相对较慢,因此不能防止再现信号速率的短期偏差。电子可变延迟线(evdl)由于其相对快速的响应,可以进一步减少时序误差。本文对该问题进行了数学分析,并对evdl提出了要求。然后描述了实现电子可变延迟的两种装置,一种用于高频信号,另一种用于低频信号。并给出了使用这两种延迟线的实验结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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