In this episode about Open Source Acoustic Modelling we will look at how to make a simple Julia model of one of the simplest systems in acoustics, a rectangular room with rigid walls, assuming adiabatic wave propagation. Even if this system is among the simplest in acoustics, it is actually already very complicated. As such, we will focus only on the modes, one part of the problem, without attempting impulse response simulation or other fancy things like that, for now.
See this page for all the episodes in order of publication.
Welcome to the first actual episode of the series about acoustic modelling with open source software. We will first try to understand what modelling acoustics means. In reality it doesn’t mean just one thing, as many phenomena of acoustic wave production and propagation can be modeled and simulated in various different ways, with higher or lower degree of accuracy. However, the core of the modelling problem resides in partial differential equations. This post will be a very, very, brief, intuitive and not rigorous introduction to the topic, mainly to give context to those that are not accustomed to the concept. If you are experienced about physics and acoustics, you can completely skip this episode.
As part of my profession as an acoustician, I often make use of Open Source software. It might surprising to few that the Open Source ecosystem is actually filled with very good packages for this task. As a result, I decided to try to publish a little series of tutorials about the topic, and this would be its first post.
So let’s first have a look ad the most important numerical simulation programs and technical computing languages that can be used to simulate acoustics. There are many programs out of there, but I mainly made use of ElmerFEM. ElmerFEM will be the focus of the series then, and we will look at how to set up Ubuntu 18.04 to be our workstation!
When I was completing my Bachelor degree in Physics, I started looking around to see whether I could find Universities offering courses in Acoustics, but with (mainly) audio applications in mind. Whilst many engineering departments might offer Environmental Acoustics programs, it is harder to find the ones about Audio Acoustics. I though it could be useful to summarize in this post the main options I found, both while I was looking around and afterwards.
Although all I have to say about this laptop was concluded at this final review, I though it might have been appropriate to report the first significant damage this laptop occurred in.
This post is being written few months after the issue appeared (December 2017, more than two years after I bought the laptop) as I wanted to thoroughly test the way I fixed it before to report anything.
So, I have been using a Focusrite Scarlett 2i4 for quite some time. I have now changed to another cheaper interface, and I though it was a good occasion to draw my conclusions on what I think about the Scarlett.
Overall, my opinions are mixed. There are good pros about this device, but also few significant cons.
Although the product I am reviewing is not current anymore (there is a new generation out there now) I think it might still be useful to have a look into this, as it can give some insight about what kind of products and functionality we can expect from Focusrite.
In the previous posts about latency (Part 1 and Part 2) we informally talked about latency and its perception. We mostly made “rule of thumb” reasoning in order to arrive to some reasonable conclusion about latency, its perception and good latency thresholds.
In this post we will look instead at a scientific paper published on the topic: The Effects of Latency on Live Sound Monitoring by Michael Lester and Jon Boley. Perception of sound is a very counter-intuitive and complex phenomenon, it will be nice to see how our rule of thumb compares to a more appropriate scientific study of the matter. It is not uncommon, especially in this field, to see results completely different from what it was expected due to simple reasoning…
So let’s not loose any more time and let’s dig in!
For new Linux users audio can be a shock. Many newbies that ask for support on forums have a perfectly working system, but are prompted to think otherwise by the not-really-straightforward way audio on Linux works. This post is an attempt to summarize and clarify how Linux audio works on a standard modern Linux installation.
The most followed posts in this blog were the ones reviewing the Entroware Apollo laptop I purchased. The reason is that it is hard to find detailed information about Entroware models. I have been using the Apollo-1000 model for a little over a year. It is the only computer I have, so I use it everyday. I though that a report of how this laptop behaves after a year would conclude the review, giving to interested people a feeling of how this computer ages. So, here I am giving to you my impressions.