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PSoC 5, 3 & 1

Anonymous
Not applicable

 Hi

   

I'm working with an audio project, and I don't know how to get 24 bit resolution from the filter to the VDAC.

   

My issue that the vdac is 8 bit maximum and I need 24 bits. 

   

Can I plays 4 vdacs in paralell or can I use current DACs with diffrent resistors?

   

How can I change the resoltion of filter output?

   

Does  someone knows what is the normal resolotion of audio?

   

Thanks a lot

   

Waiting for your kind help

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4 Replies
Anonymous
Not applicable

Thanks a lot

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Anonymous
Not applicable

  Hi

   

I had a few issues with the resolution that TI have a good solution for that.

   

You can try the C5000-seria. 

   

http://www.ti.com/ww/en/embedded/c5000_audio_capacitive_touch_boosterpack/index.shtml?keyMatch=micro...

   

Anyway if you have any good answer please let me know.

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odissey1
Honored Contributor II

 PSoC is not friendly with audio. You have to add some audio backpack or better yet use specialized audio processors like this

   

http://www.vlsi.fi

   

odissey1

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ETRO_SSN583
Esteemed Contributor

I'm working with an audio project, and I don't know how to get 24 bit resolution from the filter to the VDAC.

   

My issue that the vdac is 8 bit maximum and I need 24 bits. 

   

 

   

You cannot get more than 8 bit D/A resolution out of a VDAC or a PSOC. The only

   

way that can be done is with a PWM followed by an integrator/LPF, and that will

   

not handle audio frequencies and has poor settling time.

   

 

   


   

Can I plays 4 vdacs in paralell or can I use current DACs with diffrent resistors?

   

 

   

No.

   

 

   

How can I change the resoltion of filter output?

   

 

   

Changing filter resolution used will not solve the D/A resolution conversion performance.

   

However, if you absolutely had to change filter math resolution you could control how many

   

of the higher order bits you use from filter output, or use DFB assembler and create from

   

scratch the filter needed and the resolution of the math operated on.

   


   

Does  someone knows what is the normal resolotion of audio?

   

 

   

    

   

          http://en.wikipedia.org/wiki/High-resolution_audio

   

 

   

If the class of product you are working on is hi fidelity audio, for music, then you

   

will need an external DAC. If it is for speech 8 bits is adequate for many applications.

   

 

   

Regards, Dana.

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