单项选择题
Let the lengths of the two finite-length sequences be M and N respectively. If you want to use DFT to calculate the linear convolution of the two, the length of the DFT should be at least ( ).
A、max(M,N)
B、M+N-1
C、M+N-2
D、min(M,N)
Let the lengths of the two finite-length sequences be M and N respectively. If you want to use DFT to calculate the linear convolution of the two, the length of the DFT should be at least ( ).
A、max(M,N)
B、M+N-1
C、M+N-2
D、min(M,N)