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CCS/TMS320C5515: USBSTK5515 convolution routine

Part Number: TMS320C5515

Tool/software: Code Composer Studio

I'm developing a FW using the USBSTK5515 board:

I'm trying to use the convol2 routine from the DSP Library (DSPLibrary_spru422j.pdf) but it works differently from an ordinary convolution routine that needs an input buffer of  length N, a kernel buffer of length M and an Output buffer of N+M-1 length.

The convol2 routine works with an input buffer of N+M-1 length, where  N: output buffer length, M: kernel buffer length.

Is there anybody that may explain me how this routine works ?