A short jam session on keys
Posted onSome of Damien’s playing: Inspired by the Cat Empire and Angie. Oscar Peterson’s Hymn To Freedom. Stevie Wonder’s Superstition with overdubbed clav.
Category: Audio
Digidesign 003 Rack: Linux driver history
Posted onA brilliant ALSA developer, Clemens L, has been working on a separate ALSA driver for streaming sound over firewire within the linux kernel. This would mean that the FFADO project would be unnecessary as an addon for JACK audio connection kit to provide support for firewire devices in the future, as there would exist a […]
Keyboard amplifier mixer combo 2×8 – ZAMplifier
Posted onzamplifier
Overlap-save method of block convolution for fast convolution on audio streams.
Posted onLet $$\mathbf{h}$$ be a vector of size $$P$$ containing the impulse response you wish to convolve with, and let $$\mathbf{x}$$ contain an unknown number of float values which is the input audio stream. Note that an FIR filter can be expressed as follows: $$FIR(x[n],\mathbf{h})=y[n]=\sum_{j=0}^{P-1}({x[n+j] \cdot h[j]})$$ By chopping up $$x[n]$$ into sections of length $$L$$, […]
Use your NVIDIA GPU as a DSP chip
Posted onI have been working on a jack client that uses the GPU to process audio. The benefit of this is that it lightens the load off the CPU to process audio. I used the NVIDIA CUDA toolchain to create a jack-cuda client. Currently I have made a gain plugin that uses 256 parallel threads to […]
New Protools Plugin – ZAMCompressor
Posted onA new plugin has been added to the ZamAudio plugin suite, ZAMCompressor. Screenshot: cell phone spying
Digidesign Mbox 2 Mini on Linux
Posted onThere does not currently exist a linux driver for Mbox 2 mini. I don’t have the hardware so I am not writing one either. This page is for driver discussion on this model. UPDATE 4/12/2010: The Mbox2 and Mbox2 Mini share the same USB ID and usb endpoints thus they are physically the same device […]
Linkwitz-Riley (LR4) digital crossover filter implementation
Posted onAfter reading extensively on digital filters, I decided to write my own digital filter using the Bilinear Transform method. What is a digital filter? A regular analogue filter uses passive radio components to filter out certain frequencies of an input signal. A digital implementation of this aims to have the same effect, but it must […]
JACK audio plugin – gate/expander with sidechain
Posted onI decided to write my own audio plugin, a gate/expander, because I couldn’t find a good equivalent plugin. You can download a patch for calf-plugins git tree here. To fetch the plugin code and patch to my version: git clone http://repo.or.cz/r/calf.git calf cd calf git apply path-to-my.patch ./autogen.sh ./configure –enable-experimental make sudo make install I […]
Digidesign Mbox 2: Linux driver provided!
Posted onThis is my unofficial Digidesign Mbox 2 driver for linux. Please consider donating $5 for further development of free software drivers for Digidesign hardware. Every little bit counts. For those of you who want the raw driver source, here it is as a kernel module [63kB]. It can be compiledfor the current running kernel as […]
Installing professional audio software for Ubuntu Linux
Posted onWhile Linux doesn’t have a piece of software that rivals the usability of Pro Tools, you can still do high-quality audio recording with Ardour DAW, a professional digital audio workstation. written for linux/osx. Also, you can use your linux machine as a virtual synthesiser by using VST instruments and recording directly into Ardour DAW. Currently, […]