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采集的声音信号如何反相处理后输出

我用AIC23和5509A在MIC口采集音频,在POUT口可以听到声音。那么我想对此音频信号进行反相处理后在输出,那么程序该如何编写呢?以及我采集的音频信号该如何查看呢?希望可以得到大佬们的解答!