The Dyadic Analysis Filter Bank

Dear all,

I am using the 'Dyadic Analysis Filter Bank' block in Simulink to extract the wavelet coefficients between 2.5 kHz to 5 kHz. In the first test, I use the 10 kHz sampling frequency and use the level 1 coefficients. The results are correct. But in the second group, I increase the sampling frequency to 20 kHz and use level 2 coefficients. Theoretically, the results in both tests should be same since the extracted coefficients are in the same frequency bands (2.5 kHz to 5 kHz), but actually, the results of these two tests have a large difference. Does anyone know why it occurs and how to address this ?

Thanks,

Best regards,

Di