Odds and Ends

This is a simple overview of the basics of sound, human hearing and the workings of digital audio recording, with particular focus on the recording of bird songs and calls. There will be almost no mathematics, but enough of the important concepts, so you will know a little bit about what to consider when buying a recorder and also so you will understand the important recording parameters that you can control and how to set them.

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Introduction This article describes how to set up a website www.example.org with nginx and Let’s Encrypt HTTPS certificates on Ubuntu 20.04. I also describe how to make sure that the same website is served at https://example.org The domain example.org is a reserved domain name for use in illustrative examples in documents. and https://www.example.org and that HTTP requests to the server’s IP-adress are redirected to https://www.example.org. The article is based on notes from when I set up this website on a Digital Ocean droplet.

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