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采用结构简单的余弦补偿器的波形补偿技术已经用于数字磁记录系统,以提高记录密度。这种补偿器由延迟常数为τ的延迟线、分压比为 K 的幅度分压器和差分放大器组成。为了获得最小脉宽和最小幅度下降,K 和τ有最佳的组合。在 K 和τ的最佳组合时,半脉宽将减小到0.6倍。这意味着记录密度约有效地提高60%或更高一些。随着孤立脉冲半脉宽的减小,脉冲拥挤度也减少。然而,已经证实,当输入端上的信号噪音比为35分贝时,记录密度的实际提高已经减少到约30%。在更低的信噪比情况下,如果把电平检测用作信号检出方法,则记录密度稍有下降。
Waveform compensation using a simple cosine compensator has been used in digital magnetic recording systems to increase the recording density. This compensator consists of a delay line with a delay constant of τ, an amplitude divider with a division ratio of K, and a differential amplifier. In order to obtain the minimum pulse width and the minimum amplitude decrease, K and τ have the best combination. At the best combination of K and τ, the half-pulse width will be reduced to 0.6 times. This means that the recording density is effectively increased by about 60% or more. As the isolated pulse half-pulse width decreases, the pulse crowding degree also decreases. However, it has been confirmed that when the signal-to-noise ratio at the input is 35 dB, the actual increase in recording density has been reduced to about 30%. At lower signal-to-noise ratios, recording levels slightly decrease if level detection is used as a signal detection method.