解决数字信号的传输问题,需要各种数字传输设备。为满足波形传输无畸变的条件,要求在使用频率范围内衰减特性和群时延特性为一常数。但实际使用的信道频率特性并不是这样理想,使传输波形发生畸变造成码间干扰而直接影响到传输质量。解决的方法是施加均衡技术。均衡的方法有多种,归结起来分为两类:时域均衡和频域均衡。前者近几年已发展到用卡尔曼滤波方法实现自适应均衡;后者传统上用模拟网络实现,有源、无源均可,缺点是体积较大、调整不方便等。针对这些问题,考虑 Addressing the transmission of digital signals requires a variety of digital transmission equipment. To meet the undistorted conditions of waveform transmission, it is required that the attenuation characteristics and the group delay characteristics be a constant within the operating frequency range. However, the actual frequency characteristics of the channel used are not so ideal, so that the transmission waveform distortion caused by intersymbol interference directly affect the transmission quality. The solution is to apply equalization techniques. There are several ways to balance, boils down to two categories: time domain equalization and frequency domain equalization. The former has been developed in recent years to achieve self-adaptive Kalman filter equalization; the latter is traditionally used to achieve analog networks, both active and passive, the disadvantage is bulky, inconvenient to adjust. For these problems, consider