Music or Speech using MSP430G2553 and Energia

[russcky 9]

I've been looking for a while and can't find a good example showing how I can play any sort of music or speech files (mp3, au, wav, etc.).

 

I've got a configuration setup that allows me to read files for things like LCD screens, I'm looking to read a music or speech file and play it through 

an amplified speaker.

 

I'm not looking to make just tones, rather to play full music or speech files.

I've found projects for Arduino such as (http://hlt.media.mit.edu/?p=1963), but nothing that works with MSP430 and Energia.

 

Has anyone done something similar to this with Energia?

[Rickta59 589]

http://forum.43oh.com/topic/1501-ti-launchpad-plays-bad-apple/

[russcky 9]

I found exactly what I was looking for here:  

 

http://artists.sci-toys.com/speech

 

This is working great!

[spirilis 1,263]

That's pretty cool.  An "eventual" goal of mine is to store a couple minutes of PCM audio on a serial flash chip or something and stream it out using an MSP430F5172 with its Timer_D used for higher-resolution (e.g. hopefully 10 or 11 bit) output.

 

I have the serial flash chip soldered to an SMD protoboard, just haven't got around to playing.

[spirilis 1,263]

Actually I should step up the pace on that project, because Halloween will be here before ya know it and I want to scare the bejesus out of the kids in my neighborhood  :grin:

I have a PIR motion detector for this project too...

[energia 481]

That's pretty awesome! Great find!

[Rickta59 589]

I found exactly what I was looking for here:  

 

http://artists.sci-toys.com/speech

 

This is working great!

Won't the lack of current limiting resistor on the first circuit fry the P1.6 pin?

 

And what about some resistors for the npn transistor on the 2nd circuit?

 

-rick

[russcky 9]

Anyone know of an easy way to convert audio files such as 'wav', 'mp3' or 'au' to byte arrays?

 

The online tool in the article above didn't work properly for me.  I'm getting an error something like this from his website:

/var/www/vhosts/sci-toys.com/artists/libsndfile-1.0.25/examples/wave_to_launchpad /tmp/phpSuuJaI > /tmp/bar

I thought I had found something during my searching last night but forgot to bookmark the app, and now I'm not able to find anything either as a program or web app.

 

Anyone else saving audio as byte arrays to save on SD cards for playback on MSP's?

[Rickta59 589]

The program Audacity provides many ways to resample and convert from compressed audio formats to raw PCM data.

 

-rick

[spirilis 1,263]

Also the 'sox' CLI program in Linux offers simple wav conversion stuff.

 

Sent from my Galaxy Note II with Tapatalk 4

 

 

[mafiaWolf 0]

I found exactly what I was looking for here:  

 

http://artists.sci-toys.com/speech

 

This is working great!

Have you done this demo yet?

[zeke 692]

Not too long ago, I read about some clever guys who figured out a way of creating pretty high quality audio from an arduino or similar just by using two pwm outputs in a sort of class b amplifier configuration.

 

One output created the first 180 degrees of audio and the second created the remaining 180 degrees.

 

They said that it sounded like 16 bit audio from an eight bit micro.

 

They played some music samples on camera and it sounded remarkable good.

 

I wished I could remember where I read about this. Maybe the adafruit blog.

[austen520 6]

I've been toying with this method over the last few days for an audio synthesizer project. With a 62.5KHz PWM (16MHz main clock with CCR0 set to 255), it works well for lower frequencies, as long as you feed the PWM into an appropriate low pass filter. TI has a decent application report that details how to set this up with the MSP430: 

 

http://www.ti.com/lit/an/slaa497/slaa497.pdf

 

 

 @zeke: That sounds like a great idea. I did some googling and found some interesting resources on the topic from Open Music Labs:

 

http://www.openmusiclabs.com/learning/digital/pwm-dac/dual-pwm-circuits/(theory)

http://wiki.openmusiclabs.com/wiki/PWMDAC(an example using arduino)