During this step, the user partitions the signal data while allowing a certain amount of overlap between the partitions. The overlapping frames and data counts are integers and relate to the data counts for the FFT. The formula is as follows.
T: Total time
L: Time of frame data
Nf: Fame count for STFT
o: Overlap time
λ: Overlap ratio
The data count is an integer and each frame represent the count of the input data for the FFT (e.g. 256, 512, 1024…). Therefore, in order to use the existing data without using the interpolation to conduct STFT, the user should first select the data count of the frame to minimize the residual data and then determine L and O that can produce proper resolutions. The formula for residual data is as follows.
: Total
data count
: Residual
data count
: Frame
count
: 1 Frame
data count
: Overlap
data count
After the user determines and /, the user is ready to conduct STFT.