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符号位数字记录,意思就是仅仅记录模拟信号的一个符号位。常规的地震方法在记录信号的符号和振幅时,每个采样点需要16至20个二进制位,所以符号位记录的优点是很明显的。但通过正确应用符号位记录,来恢复模拟信号的全部振幅,却不是十分容易的。本文(a)讨论了地震勘探中多道(～1000)记录的应用;(b)用半直观的方式描述了振幅恢复过程,这样就可对合理应用该技术有必要的了解;(c)以讨论问题的方式,找出合理的地震应用所需要的动态范围的要求;(d)提出进一步研究的范围。本文研究的重要结论是:若满足了记录地震数据时所要求的下面两个条件,则符号位数字化将是一门很有发展前途的技术。第一,实时相关信号与随机干扰之比必须≤1。第二,记录的数据必须充足。经过重复激发、连续变频振荡相关、共深度点的多次叠加以及三者综合的形式,就能够获得冗余的数据。反之,不符合以上的条件,就会分别造成:(1)不完全的振幅恢复(限幅数据)和(2)信号恢复过程中不足的动态范围。在第二篇文章中介绍数学公式的推导。
Symbolic digit records, which means that only one sign bit of the analogue signal is recorded. Conventional seismic methods require 16 to 20 bits per sample when recording the sign and amplitude of the signal, so the advantages of sign bit recording are obvious. However, it is not easy to recover the full amplitude of an analog signal by correctly applying a sign bit record. This paper (a) discusses the use of multi-track (~ 1000) recordings in seismic exploration; (b) describes the amplitude recovery process in a semi-intuitive manner so that a sound understanding of the proper application of the technique is possible; (c) Discuss ways to solve the problem and find out the dynamic range required for a sound seismic application; and (d) propose a range of further studies. The important conclusion of this paper is that the digitization of the sign bit will be a very promising technology if the following two conditions are required when recording seismic data. First, the ratio of real-time related signals to random interference must be ≤1. Second, the data recorded must be sufficient. After repeated excitation, continuous variable frequency oscillation related to the total number of points in the depth of the superposition and the three forms of synthesis, you can get redundant data. Conversely, failure to meet the above conditions will result in (1) incomplete amplitude recovery (clipping data), and (2) insufficient dynamic range during signal recovery. The second article introduces the derivation of mathematical formulas.