高质量信号传输系统中加重电路的设计

将语言和音乐信号看作是由许多不同频率的频谱信号组成,但信号的频谱分布不均匀,多数的信号能量都集中在低频频谱上,而高频信号的能量要小得多且受电磁影响引起的噪声干扰大。因此,在高频段利用加重电路可以得到整体的改善,而在信号接收端利用卸重电路可将频谱幅值恢复到原始值,从而大大提高信号的传输质量。通常在运算放大电路的分析中将运算放大器看成理想器件。本文在预加重电路设计中将运算放大器的增益 带宽积看作是有限值,得知该电路对高频噪声信号有很好的抑制作用。

Emphasis circuit design in high quality signal transmission system

Signals of voice and music are composed of lots of frequency spectrum signals that have different frequency. But the distribution of signal frequency spectrums is not uniform. Majority of the signal energy focuses on low frequency. High frequency signal has less energy, yielding great interferential yawp. Thus, the circuit performance of signal transmission can be improved by using emphasizing circuit on the high frequency signal and de-emphasizing circuit at receiving signal end. This paper describes the emphasis circuit design, considering the product of the gain and band-width as a finite value in the operational-amplifier. It reveals that the high-frequency noise is suppressed effectively.