Elastic Sheep

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Entries Tagged as 'Audio'

Babyphone hardware design

January 25th, 2012 · No Comments · Uncategorized

Here are some details about the hardware design of my babyphone project. Case reuse One of the project goal was to reuse as much of the original speakerphone case as possible, including the power switch, volume control potentiometer, front leds and keyboard. I though that as the box already contained amplifiers circuits for the speaker [...]

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Babyphone audio playback

January 21st, 2012 · No Comments · Uncategorized

The final circuit has been built inside the phone enclosure, including amplifiers for the speaker and the microphone. Playback and record modules are developped an tested but the application code only supports playback for the moment. Next I need to improve the matrix keyboard driver to allow multiple key detection to trigger the record of [...]

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Current project

September 27th, 2011 · No Comments · Uncategorized

I am currently building a “baby phone” toy for my son based on a discarded landline phone enclosure. The toy will feature record and playback on SD card to allow family members to record messages on the device. Voice messages would be played back when pressing a key of the original phone keyboard. The plan [...]

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Adding alsa audio support to a Buildroot-based system

January 28th, 2011 · 7 Comments · Uncategorized

I have tested the building of a basic Linux system with Buildroot. I would like now to add audio support to this system with mp3 decoding capabilities. The mp3 decoding will be handled by the mpg123 application. The decoded audio playback will go through the alsa-lib userland interface that communicates with the alsa kernel subsystem. [...]

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Teensy2 USB WAV player – Part 2

June 29th, 2010 · 17 Comments · Uncategorized

[Update Jan 6th, 2011 / An error in the capacitor unit (pF instead of nF) has been fixed in the schematics] Long overdue post in my USB WAV player implementation series. Let’s go ! General architecture Here are the main software building blocks of the application: The left side is the USB Mass Storage implementation [...]

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