Tag Archives: Digital filter

Announcement: Audio TK 0.1.0

A long time ago, I started implementing audio filters with a Qt GUI. I also started other pet projects in the same area, but I didn’t have a proper audio support library in C++ for that. Also Qt plugins are no longer an option (for me), I still hope to implement new filters in the future.

Continue reading Announcement: Audio TK 0.1.0

Book review: The Audio Effects Workshop

How to explain the different kind of audio effects and how to understand what their use is? Although I learnt a lot by practice, there is sometimes the need for some theory and for experiments. I tried to find a book that matches these two points: good theory and proper practice. I’ve chosen this book, with tracks on a CD for experimentation. Was it really what I was looking for?

Continue reading Book review: The Audio Effects Workshop

Book review: SONAR X1 Power!: The Comprehensive Guide

I think I’ve said it already, I have a rock band. Currently, we are recording our first album, and while we used Traktion in the past, I’m considering moving to Sonar (it is continuously updated and has a great reputation, also I’ve played a few time in the past with its ancestor Cakewalk).

So let’s talk about the book’s comprehensive guide.

Continue reading Book review: SONAR X1 Power!: The Comprehensive Guide

Announcement: QtSimpleEQ 1.0 (QtVST)

I’m pleased to announce the 1.0 version of QtSimpleEQ, a plugin with one low-pass, two peak and one high pass second-order filters. Nothing fancy in the algorithms, it’s mainly another show case for Qt VST plugins.

The code is available under the GPL2 on github and on Sourceforge.

The plugin can be download on the Sourceforge project page.

The plugin was tested with Tracktion 3 (Windows XP).

Snapshot:

QtSimpleEQ UI

Buy Me a Coffee!
Other Amount:
Your Email Address:

Announcement: QtSimpleOverdrive 1.2 (QtVST)

I’m pleased to announce the 1.2 version of QtSimpleOverdrive.

Since last version, the GUI was changed, and mainly the automation has been fixed. As such, old parameters are no longer valid, sorry…

The code is now available under the GPL2 on github and on Sourceforge.

The plugin can be download on the Sourceforge project page.

Buy Me a Coffee!
Other Amount:
Your Email Address:

Announcement: QtSimpleOverdrive 1.0 (QtVST)

I’m pleased to announce the release of my first VST plugin (Windows 32bits), based on the simple overdrive prototype.

It is a mono filter, with an oversampling of 2 to 32, based on polyphase filters, and the undersampling is done after an 8th order Butterworth lowpass filter with a cut frequency of 22kHz.

The source code will be available (under the GPL) in the future if there is interest in the plugin and its support. The exact way it works will be explained in a future blog post.

The audio plugin is available on Sourceforge: https://sourceforge.net/projects/qtvst/files/QtSimpleOverdrive/

If you find any issue, please submit it on Github: https://github.com/mbrucher/qtvst

Please note that the oversampling can be quite CPU intensive (on my laptop, an Intel Core2 T7200, using an oversampling of 4 at 96kHz uses the full power of one core).

Buy Me a Coffee!
Other Amount:
Your Email Address:

A Sourceforge project for QtVST

I’ve set up a SourceForge project where I will put all the binaries for this project.

The source code is still on Github (https://github.com/mbrucher/QtVST), but it won’t always contain the source code for each VST plugin. The next plugin I’m working on is based on the overdrive I’ve blogged about some months ago.

The download page: https://sourceforge.net/projects/qtvst/files/

Electronic: The purpose of an oversampling filter

A few months ago, I’ve posted a note on an overdrive. The main issue of this kind of non-linear filter is aliasing, a process that adds digital acoustic content. The best way to solve the issue is to oversample the input before processing the signal.

Continue reading Electronic: The purpose of an oversampling filter

Electronic: Simulation of a simple overdrive

There are some effects that are simpler than other. Digital ones are generally easier than analog ones, and purely digital filter are also easier than digitally-transformed analog ones. Linear filters such as passband, cutband, … are easy to digitally design, chorus can be achieved through some spectral computations, delay and reverbation are computationnally expensive but easy to code.

It said that analog devices have a unique sound that digital devices cannot achieve. In fact, much is due to the simplications that occur when digitizing an analog device. One of the most blatant examples is the overdrive, which I took from Simulanalog.
Continue reading Electronic: Simulation of a simple overdrive