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MSP-EXP430G2: Help with developing an analog signal converter with a msp430G2553 chip.

Phill.S
Prodigy 30 points

Part Number: MSP-EXP430G2

As the title says I'm looking to develop an analog signal converter, or modifier to be more specific, using the 430G2553 chip.

To be more specific the project is to take the signal from an electric guitar/bass that has an on board pre-amp, pass it onto the board and modify the signal such as to imitate an effect pedal(distorted sound for example). 

I know that I'll need to limit the voltage from the guitar's pre-amp from the 9V battery that it uses to 5V as to protect the board.

My question is if I will need anything else for the project like more amps for the signal after the modification and such. My knowledge of circuitry is limited for projects like that as I have recently started using microcontrollers and electronics, that is why I ask for any assistance that can be given. The type of signal that will be the finished product hasn't been decided yet for the reason that I might need to do some research on the conversion, but I'm pretty sure all modifications can be done through SW alone if I'm not mistaken to the capabilities of the chip. Also if this specific chip can't do the work I need you're welcome to point me to a TI one(or non if need be) that I can use to make my project.

Thanks in advance for any help given.

P.S Sorry if this isn't the right section of the forum to ask for such assistance, and this thread can be moved to the right section if needed.

  • 0
    TI__Genius 17960 points

    Hi Phill,

    many thanks for considering our product for the implementation of your idea. From your original post I understood you're a beginner in terms of electronics, thus I assume it is the same with processing of audio data with electronic ICs and other circuitry.

    The application you've selected is very complex, and one could certainly write books about, but I still would like to give you some starting points.

    Though the MSP430G2553 is equipped with an ADC, and the Timers could be used to output a PWM signal, which could be cleaned by external filters to improve the audio quality, the 10bit resolution of the ADC and the PWM audio output, will probably not address your sound quality indications. This leads us right to the core question: What are your expectations on the final result in terms of sound performance?

    1. If you just would like trying how an application like you described works, this might be a good starting point.

    2. If you expect something in the range of professional equipment, the MSP430G2553 and probably MSP430 as such will not be the right choice.

    Just to give you some indications. Good audio quality requires at least true 12bit resolution. CD has 16bit, high end audio works with 24bit.

    Converting analog sound to digital format, process it for modifications like changing the harmonics (distortion, sound effects....) the signal chain would look like following: analog signal >> OPAs for filtering / conditioning >> ADC >> Sound Processor (usually high speed and processing power, this has been done in the past by DSPs, as keep in mind, it has to happen in real time, means as low time delay as possible) >> DAC (converting the digital modified signal to analog) >> OPAs amplifying and filtering the signal.

    Nowadays you could also go with a digital audio signal into a digital amplifier, instead of converting the processed signal back to analog.

    If your goal should be something in-between the two roughly outlined extremes, please let me know, then I can suggest you the best possible MSP430 selection.

    Best regards

    Peter

  • 0 in reply to Peter Spevak
    TI__Genius 17960 points

    Hi Phill,

    it looks like the initial suggestions have given you a starting point. In case of need you can of course contact us again. For now I am closing this thread.

    Best regards

    Peter

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