SPKit, contains highpass filter, bandpass filter, lowpass filter and so on.

对一段音频文件进行了一系列的操作，诸如设置一个低频滤波。-processing an audio signal, such as filtering it with a Lowpass frequency filter.

Here is simple Biquad C code to use in audio graphic equalizer, Lowpass filter, Highpass filter, Band stop, Bandpass etc-Here is simple Biquad C code to use in audio graphic equalizer, Lowpass filter, Highpass filter, Band stop, Bandpass etc...