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TLV320AIC3254EVM-K: InputOutput of PurePath Studio?

Ez E
Prodigy 170 points
Part Number: TLV320AIC3254EVM-K

Hello,

First of all I am not a DSP engineer so please pardon the simplicity of my question regarding this topic, I am currently using PurePath Studio to program the audio application. I have a question about the first block in the input chain, InputOutput,

what are the differences between different decimated input like Dec1xIn or Dec2xIn, (only thing I know is they are downsampled).  

What is the difference between decimated input and I2S input, i mean when do we use the two input?

What is the difference between the interpolated output  and I2S output ( beside from them being upsampled) and why can't i record signal in audacity when i change from I2S output to intepolated output?

Thank You,

  • 0
    TI__Guru 57800 points

    Hi, Ez,

    Thanks for your question. In PurePath Studio (PPS), the input block from the device's ADC is called Decimator (DecXxIn) and the output to the DAC is called Interpolator (IntXxOut). The differences between them are the supported sample rates for each block. Please refer to the help file for these blocks in order to find more information. In addition to the connections between the miniDSP and the DAC/ADC, the miniDSP of the test device has access to the I²S port, having the option to take or send the data through the audio serial port. So, in general, you can see the miniDSP available inputs and outputs as follows:

    You can use both Decimator and I²S input on the miniDSP, it all depends on the processing you want to achieve with the device. When you are using the Interpolator output, the processed data is sent to the DAC of the device, which means that the analog output of the device is the output of your signal.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Prodigy 170 points

    Thank you Mr Lopez for a very good explanation and the clear diagram diagram. If i understand you correctly there can be two inputs for microphone in this board one from the decimated input and one from the   

    serial port like in this example processflow we take two mono microphone input mix it into stereo and send the output via the interporlator channel.