Detecting Audio Transients (Example and Free Cross-Platform Software)

Wikipedia defines an audio transient as "a high amplitude, short-duration sound at the beginning of a waveform that occurs in phenomena such as musical sounds, noises or speech". Here's an example that points out the transients in a short snippet of audio:

Waveform with Transients Annotated

So, a transient is just a peak that occur…

Date: March 11th, 2017 at 11:02am
Author: Terence Darwen
Tags: Audio Software, Cross-Platform Development, Transient Detection, Digital Signal Processing, DSP, C++, Sabbatical

Using Dual MCP23S17 I/O Expander Chips with the Tiva LaunchPad

In a blog post a few weeks ago I showed how I had been using an I/O expander chip with the Texas Instruments Tiva LaunchPad to provide eight additional inputs using a single serial connection. I've managed to increase this to 32 inputs.

Tiva LaunchPad and Dual MCP23S17 Chips Annotated

I did this by using dual MCP23S17 I/O expander chips as shown…

Date: March 1st, 2017 at 8:43pm
Author: Terence Darwen
Tags: Embedded, Tiva LaunchPad, TM4C123G, ARM Cortex-M4, Microchip MCP23S17, I/O Expander, Synth Project, Sabbatical

New Reading Material - Algorithms, Hardware, Haskell and More...

I've been wrapping up my rereading of classic C++ books mentioned in a previous post here and looking into, and starting, some new reading material recently.

Computer Organization and Design, Algorithms and Haskell

I don't like immersing myself in a single book for many hours a day, but instead I try and read a little bit (maybe 15-60 minutes) each day a…

Date: February 21st, 2017 at 3:21pm
Author: Terence Darwen
Tags: Reading Material, Sabbatical

My Awesome Phase Vocoder (Audio Examples and Free Software Download)

In the spirit of the blog post I wrote on Alternative Music Production Software a few weeks ago, I've been spending a good amount of time working on a phase vocoder lately. I'm happy to say I have an early working demo version that sounds quite good.

Piano Waveform Stretched and Compressed

The phase vocoder allows for stretching and com…

Date: February 14th, 2017 at 9:42pm
Author: Terence Darwen
Tags: Audio Software, Cross-Platform Development, Phase Vocoder, Digital Signal Processing, DSP, C++, Sabbatical

Using Embedded Artists' LabTool with My Tiva LaunchPad

Lately I've been working with using I/O expanders in conjunction with my Texas Instruments Tiva LaunchPad. The Tiva LaunchPad has a limited number of I/O pins and I'm trying to increase the number by using I/O expander chips.

Tiva LaunchPad and LabTool

I came across this YouTube video which shows how to use an MCP23S08 I/O

Date: February 7th, 2017 at 3:02pm
Author: Terence Darwen
Tags: Embedded, Tiva LaunchPad, TM4C123G, ARM-Cortex-M4, Embedded Artists, LabTool, Sabbatical