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Phase Shifting Audio Signal

Hi,

I Am new to DSP. I started working on DSK6713 . 

I have been giving a input to DSP through MIC IN, so i would simply process it and send it to LINE OUT.

So before i send the audio out, i would want to invert the phase of the signals .

I am not sure what exactly has to be done. Have attached a screen shot of  what exactly is required. 

A 90 Degree phase shift of each input signal.

  • Hi,
    I'm not sure that whether it is possible without hw change.
    Just check the internet for algorithm which would do phase change.

    Before provide the audio signal to MIC, you may have to setup one hw which would do phase change and give to MIC IN port and do loob back (MIC IN to AUDIO OUT).
    Is that okay or you must want to do with DSP using algorithm etc., ?
    Why do you want to phase shift ?
  • Hi,

    Thanks for your post.

    As we already discussed your above request multiple times and kindly do not create duplicate posts. After reviewing the AIC23 codec registers through datasheet, it is not possible to change the phase of the audio within the AIC23 codec and and you will have to do it through signal processing algorithms on DSP which is feasible. My recommendation is that you look for application notes for the C6713.

    The minimum phase delay you could possibly achieve on C6713 DSP would be one sample period, but that would depend on the sampling rate of your application, usually from 8KHz to 96KHz, which could easily be outside that range depending on your specifications and requirements.

    The method you use to do your calculations will also affect phase delay. If you do all of your processing between the time, one input is sampled from the ADC and the time the next output is required at the DAC, then you could achieve the 1 sample phase delay.

    I think, it would be more appropriate if you ask this specific part of the question to audio converters forum where there are experts over this forum to address your query better.

    Thanks & regards,

    Sivaraj K

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