diff --git a/module_usb_audio/dsp/xua_dsp.h b/module_usb_audio/dsp/xua_dsp.h
deleted file mode 100644
index 7da787f4..00000000
--- a/module_usb_audio/dsp/xua_dsp.h
+++ /dev/null
@@ -1,30 +0,0 @@
-
-
-#ifndef _DSP_H_
-#define _DSP_H_
-/* Processing interface and task */
-/* Interface to transfer block of samples to/from DSP task */
-typedef interface dsp_if
-{
-    [[guarded]]
-    void transfer_buffers(int * unsafe in_aud_buf, int * unsafe in_usb_buf,
-                            int * unsafe out_usb_buf, int * unsafe out_aud_buf);
-
-    [[guarded]]
-    void transfer_samples(int in_mic_buf[], int in_spk_buf[], int out_mic_buf[], int out_spk_buf[]);
-
-} dsp_if;
-
-
-/* Control interface and task */
-typedef interface dsp_ctrl_if
-{
-    int setControl(unsigned moduleId, unsigned control, unsigned setting);
-} dsp_ctrl_if;
-
-
-void dsp_process(server dsp_if i_dsp, server dsp_ctrl_if i_dsp_ctrl[numDspCtrlInts], unsigned numDspCtrlInts);
-
-
-#endif
-