基于DDFS的程控音频仪器测试信号源设计

Programmable waveform generator for testing audio instruments based on DDFS

文中介绍一种基于DDFS(直接频率合成)技术的可编程音频仪器测试信号源设计。该系统采用单片机作为控制器,以FPGA(现场可编程门阵列)作为信号源的主要平台,利用DDFS技术产生一个按指数衰减的频率可调正弦衰减信号。测试结果表明,该系统产生的信号其幅度可以按指数规律衰减;其频率可以在1～4 KHz频率范围内按1 Hz步长步进。可以方便的用于测试音频仪器设备的放大和滤波性能。

Introduce the programmable waveform generator for testing Audio Instruments based on DDFS （Direct Digital Frequency Synthesizer） technology. This system produces an exponential decay sinusoid waveform using the DI）FS technologies, where SCM acts as the controller and FPGA （field programmable gate array） acts as platform. The test results show that this system can generate an exponential decay sinusoid waveform, which is of 1Hz step length in 1-4 KHz frequency range. It can be easily used to testing the amplification and filtering performance of audio equipment.