生物遥测中噪声的消除。

Biotelemetry and patient monitoring Pub Date : 1979-01-01
J Fraden
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引用次数: 0

摘要

生理信号和噪声在统计特性上的差异使得设计一种选择性电路来分离信号和噪声成为可能。分析表明,在生物遥测系统中,由于脉冲调节器前的信噪比极低,在解调输入端会出现正常脉冲和杂散脉冲的混合。噪声消除系统利用生理信号在短时间内高度自相关的准则,分析两个后续脉冲之间的连续距离,并剔除所有的杂散脉冲。对电路的评估表明,在存在强干扰的情况下,由于噪声消除系统将脉冲流的无噪声部分线性外推到被破坏的空间,因此精度显著提高。给出了计算选择阈值和输出误差的方程。噪声破坏器在长期监测和自动数据分析中特别有用,因为它可以防止在生物遥测系统的输出中形成尖锐的噪声峰值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Destruction of noise in biotelemetry.

The difference in statistical characteristics between physiological signals and noise creates the possibility of designing a selective circuit to separate signals from noise. Analysis shows that by an extremely low signal-to-noise ratio before the pulse conditioner in a biotelemetry system, the mixture of normal and spurious pulses are present at the demodulator input. The system of noise destruction analyzes the sequential distances between two following pulses and blanks all spurious pulses using the criteria of high autocorrelation of physiological signals in short intervals. Evaluation of the circuit demonstrates a dramatic increase in accuracy in the presence of strong interference because the system of noise destruction performs a linear extrapolation of free-of-noise parts of pulse flow into destroyed spaces. The equations to calculate selective thresholds and output errors are delineated. The noise destructor is especially useful in long-term monitoring and automatic data analysis because it prevents a formation of sharp noisy spikes at the biotelemetry system's output.

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