discrete wavelet transform (DWT)

Question

Barney Twist 2021-1-13

回答： Suraj Kumar 2025-4-1

Goodday , l want to get a discrete wavelet transform of one signal.

I want to decompose the signal and there is a sampling frequency of 6Hz being mentioned.

What is this sampling frequency and how can l use it?

Answer 1

Suraj Kumar 2025-4-1

Hi Barney,

To perform a discrete wavelet transform (DWT) on a signal with a sampling frequency of 6 Hz you can go refer to the following steps:

1. Prepare your signal and ensure the signal is sampled at 6 Hz. This frequency helps in interpreting the time scale of your results.

2. Choose a wavelet (e.g., 'db1' for Daubechies) and decompose your signal using MATLAB's "wavedec" function.

signal = [your_signal_data]; 
wavelet = 'db1'; 
level = 3; 
[C, L] = wavedec(signal, level, wavelet);

3. Use the coefficients in C to analyze frequency components and if required reconstruct the signal with "waverec" function in MATLAB.

reconstructed_signal = waverec(C, L, wavelet);

To learn more about "waverec" and "wavedec" functions in MATLAB , refer to the following documentation links:

Happy Coding!