[Catherine Lai]

This mirroring is a fundamental property of the DFT. We go through why it happens in the SIGNALS materials. i.e.:

https://github.com/laic/uoe_speech_processing_course/blob/master/signals/sp-m1-4-discrete-fourier-transform.ipynb

Try the exercise under ‘The DFT for k = 2 and beyond’ and see if you can see why this happens.

[Catherine Lai]

Hi Kerim,

Yes, you need to install matplotlib separately to jupyter notebooks unless you are using the Edina Noteable server (where it is already installed by default).

The instructions here describe the install process if you want to run it locally (see ‘The Normal Way: Running Jupyter Notebooks on your computer’):

https://github.com/laic/uoe_speech_processing_course/blob/master/sp-m0-how-to-start.ipynb

But the basic options to install matplotlib are:

1. If you have Anaconda (or miniconda) installed, you can install matplotlib using the following command (after you have activated your conda environment)

> conda install -c conda-forge matplotlib

2. Otherwise you can use pip:

> pip install matplotlib

If you’ve done that and it still doesn’t work, you’ll need to check your installation of python and related path variables (i.e. where python looks for packages). Let us know, and we can go through that.

If you’re internet access is ok, you can also try using the Edina Noteable service (it really is easier!):

https://noteable.edina.ac.uk

See the instructions in sp-m0-how-to-start.ipynb

[Catherine Lai]

Sorry I forgot to include the link the audio for that exercise! It should be the difference between violin_A3_15 and violin_A4_05.

I’ve updated the notebook in the github repository:
https://github.com/laic/uoe_speech_processing_course/blob/master/signals/sp-m1-1-sounds-signals.ipynb

I’ve also included a link to a semitone calculator there: http://www.homepages.ucl.ac.uk/~sslyjjt/speech/semitone.html

But the main thing is just to compare those two files.

[Catherine Lai]

Thanks for pointing this out Ross! I’ve updated the notebook on github to link to the git download page.

[Catherine Lai]

You might need to check whether Anaconda has been added to your path environment variable. There are some instructions here:

https://www.datacamp.com/community/tutorials/installing-anaconda-windows

Let me know if that helps!

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