Main Site Documentation

Music Module

#1

I’m trying to build a device that is capable to play an mp3 and at the same time analyze the reaction to it with a microphone (I already have an algorithm that fits my needs for that). I wanted to use the Music Module to achieve both.
To play the mp3 I use this class: https://www.ghielectronics.com/community/codeshare/entry/368

While playing a little with the music module I found out that when I record a sound the module also sends the signal to the headphone plug. So, for me it seems like there is no way to record from the line-in and play an mp3 at the same time.

Is this correct? If so, why is that?

Thanks for helping me!

#2

Hi Andre

Thank you for answering me.
How exactly would this work?
As far as I can see I would do something simular to this:
http:// technicalstuffhopefullyuseful.blogspot.ch/2013/01/using-analog-input-sensors-with-net.html

And then I would take the incoming signal with:
analogInput.ReadVoltage()

Could I use this component as a microphone?
http:// www.play-zone.ch/de/sparkfun-breakout-board-for-electret-microphone.html

I’m sorry to ask this simple questions but I’m really a software guy, not an electrical engineer…

Anyway, it would be great if someone could make a statement about the music module…

#3

I believe that to turn off output the method would be to set the output volume to zero. Output volume is controlled by DAC_VOL and/or SCI_VOL (download data sheet: http://www.vlsi.fi/fileadmin/datasheets/vs1053.pdf ) and search for those values.

To use those registers for our driver (from http://gadgeteer.codeplex.com/ ). You will probably need to modify the source code and include the modified driver in your project.

Another reference for interacting with chip would be this demo code: http://www.vlsi.fi/fileadmin/app_notes/vs1053an_playrec.zip

#4

I think VS1053 doesn’t support simultaneous playback & record. To achieve that you would need to use two music modules. I would recommend andre’s method.

#5

Thanks for answering guys.
I’m going with Andres suggestion. It looks good so far.
But now I’m having problems with the mp3 playback (https://www.ghielectronics.com/community/forum/topic?id=5815)