the axis in wavelet transform

I change one signal from time domain to frequency domain after that I made WT for the signal I used db3 for 5 levels ... but I don't know x- axis refer to what ? and y- axis

refer to what ?

Answer 1

[Suraj Kumar]

Hi Eva,

When you perform a wavelet transform (WT), such as the discrete wavelet transform (DWT) using the Daubechies wavelet ('db3') in MATLAB, the axes of the resulting wavelet coefficients matrix can be interpreted as follows:

1. X-Axis: Represents time points of the original signal or the index of data points in the coefficients matrix.

2. Y-Axis: Represents different scales or levels of wavelet decomposition, with lower levels showing high-frequency details and higher levels showing low-frequency approximations.

For more information on the discrete wavelet decomposition and visualization, you can refer to the MATLAB's wavedec function:

• https://www.mathworks.com/help/wavelet/ref/wavedec.html

Hope this works for you!