obtaining spectrogram in hertz

how to obtain frequency axis in hertz in spectrogram, by its inbuilt function results frequency axis in normalized mode

Answer 1

[Bert]

Hi, you should pass the sample frequency as well.

 spectrogram(rand(1000,1),windowsize,overlap,windowsize,fs)

(The second time I use windowsize as an argument defines the the size off the fft)

[Avnish Bora]

Thank you for kind reply