探讨了一种数字移频法啸叫检测与抑制音频功率放大实验测试系统设计方案，用来实现带啸叫检测与抑制音频功率放大．系统以 FPGA 为控制核心(This paper has designed a testing system for an audio power amplifier with howling detection and suppression which is used to achieve howling detection