Dilshan Jayakody writes: Morse View is an open source software project to convert audible Morse codes to text messages. This application is capable to convert Morse codes from wave files or from the audio line/microphone inputs. Conversion from Morse code to text can perform based on amplitude and frequency decomposition of the input audio stream. […]
Tag Archives: audio
Personal audio & MIDI prototyping board
@rocket_not tweeted: Personal audio & MIDI prototyping board based on a design originally by @dangerousproto
A mini microphone preamplifier
Boris Landoni from Open Electronics has written an article about the design of a microphone preamplifier: This Mini Microphone Preamplifier could be used as the first stage to amplify any audio signal. The device is equipped with a microphone plus clips to be connected to a 9V battery. Amplification is achieved by using an operational LM741 amplifier. […]
Quality audio on Teensy3 with Arduino
Paul over at Dorkbotpdx writes: Over the last couple weeks I’ve been working on supporting quality audio (44.1 kHz, 16 bit) on Teensy3 using very simple Arduino style programming. This weekend I added buttons and knobs to control parameters…. This work is still at an early stage. I hope to publish a first alpha test […]
Audio/video routing switcher
Benoit Frigon posted his audio/video routing switcher project: It’s an audio/video (composite) routing switcher, i used it to switch between video sources on my tv. The tv I had back then only had 1 video input. It consist of a 8×8 video crosspoint (MAX4456) and a 16×16 analog crosspoint (AD8113) controlled by a small microcontroller […]
Free Virtual Audio Cable alternative
RTL-SDR enthusiasts who use Windows are familiar with the need for a virtual audio device to connect the SDR output to decoder programs such as dsd. The hangup is that you need to purchase Virtual Audio Cable software to the tune of $25 (more than the cost of the SDR dongle itself.) Now there’s a […]
App note: Audio applications using PIC32 microcontrollers
Here is an app note from Microchip introducing the audio-specific features of the PIC32 MCUs. One of the features disused is the hardware SPI module that supports some standard audio communication modes. In this application note, the available audio-specific features of the PIC32 MCU are explored to address these needs. The SPI module supports different […]
The Prototypers podcast
Here’s an interesting new podcast from our friends at GadgetGangster. It’s known as The Prototypers and covers various subjects of interest to electronics hobbyists. Episode 7 (the most recent) covers hacking smart parking meters with Joe Grand, the Commodore Plus Four and more. Check it out!
TI 2012 audio guide
Drone informs us that the TI 2012 Audio Guide is now available. It’s a comprehesive product selection document, covering all-digital Audio IC components as well as digital and analog Audio IC solutions from TI. Download your copy of this 57-page PDF from TI. Via the contact form.
Simple optical theremin
Here’s a simple theremin-like device designed by Sacred and presented by Jameco. Unlike other theremins which vary the sound based on the user’s proximity to stationary antennae, this project uses two phototransistors and a 555 timer. The theory of operation is the variation of the sound based upon the amount of IR light reflected by […]
Simple MCU speaker boost
Bryan Duxbury offers a tip to get more volume from a weak MCU output pin. This may be an obvious trick to some, but I just did a short writeup on a really simple way to get more volume out of a speaker attached directly to a weak microcontroller pin – like those on the […]
The $5 Picaxe Beatbox
Corticalcafe has posted a project for an audio record and repeat device using a Picaxe-08M microcontroller, piezo speaker, and a handful of resistors. The Beatbox uses LDRs shielded inside nuts to sense the input “drumbeats”! When powered up the LED indicator lights and the circuit senses about 5 seconds of input beats. After the maximum […]
Hybrid SID player using bluetooth
Markus added bluetooth to his Hybrid SID player: I thought it would be nice to have my SID player hardware located next to the stereo equipment and have its audio output connected to it. Having an USB cable running to the laptop from which ACID 64 sends the SID data isn’t convenient, so I looked […]
Serenading with Arduino
If you want to add a geek angle to a romantic dinner, what better way than Arduino generated music? Michele Spagnuolo has coded this project for a simple, minimalistic piano-theremin generated by Arduino and Processing. The hardware consists of a SRF05 ultrasonic sensor with Echo connected to digital pin 2 and Trigger/Init connected to pin […]
SoundAffects turns sounds of city into music
SoundAffects is a project designed to turn streets sounds into music. It uses an Arduino to read data from street level sensors measuring temperature, light, color, weather, cell phone activity, noise and proximity. This data is then processed using a combination of Jitter, MaxMSP and Ableton Live to produce dynamic musical compositions which passersby can […]
S/PDIF Digital Audio on the Parallax Propeller
Beth from scanlime has posted a detailed explanation of her development of an S/PDIF encoder object for the Parallax Propeller. The source code is open under an MIT-style license. If you’re a Propeller enthusiast it should be easy to implement this code to give your next sound project a digital output. Beth hopes that this […]
The Ghazala Thereglyph: radiopool synthesizer
Reed Ghazala, author of Circuit-Bending : Build Your Own Alien Instrument has released his latest creation: The Ghazala Thereglyph. He writes: The Thereglyph is a “radiopool” instrument, my term for a radio-sensitive instrument meant to be placed within the RF ‘pool’ of an outside source. Like the theremin, pitch and volume can be adjusted without […]
Arduino sinewave generator
labIII, the Laboratory for Experimental Computer Science at the Academy of Media Arts Cologne, posted this tutorial on how to generate sine waves with an Arduino using the Direct Digital Synthesis method. They explain: Here we describe how to generate sine waves with an Arduino board in a very accurate way. Almost no additional hardware […]
App note: Linkwitz equalizer puts the bass in subwoofers
rsdio writes: If anyone is building a subwoofer crossover, this is a great article! Nice use of opamps too. The linearity and high power-handling capability of modern low-frequency loudspeakers have made it easy to electronically extend the bass response. This extension is especially useful in second-order systems like a closed box, where cone excursions are […]