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本文根据我们对(日本)BS—2卫星直播电视PCM数字伴音接收系统的科研实践,介绍了贝塞耳、椭园、巴特沃斯等频域滚降滤波器的设计方法、计算机模拟和试验结果。重点介绍利用电荷耦合器件(Charge Coupled Device,简称CCD)作时域均衡器来直接实现波形形成的原理、方法和电路设计。试验结果表明,采用频域滚降与时域均衡相结合的形成滤波器设计方案是比较好的。
Based on our research on the PCM digital sound receiving system of BS-2 satellite TV (Japan), this paper introduces the design methods of Bessel, elliptic, Butterworth frequency-domain roll-off filters, computer simulation and test results . The principle, method and circuit design of forming waveforms directly by using Charge Coupled Device (CCD) as time-domain equalizer are mainly introduced. The experimental results show that it is better to use the combination of frequency-domain roll-off and time-domain equalization to form a filter design.