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AWR1642BOOST: Vital Signs

Nancy Wang
Expert 8210 points
Part Number: AWR1642BOOST

Hi,

In the example of Vital Signs, if the customer wants to obtain the amplitude of respiration and heartbeat, which of the following parameters should be output in the structure of VitalSigns_Output? Is the unit of this parameter in mm?

 1.outputFilterBreathOut

 2.outputFilterHeartOut

 3.sumEnergyBreathWfm

 4.sumEnergyHeartWfm

For the heart rate output, it is divided into heartRateEst_FFT and heartRateEst_FFT_4Hz. Whether it means that when the heart rate is less than 120, we can refer to heartRateEst_FFT, and when it is greater than 120, we need to refer to heartRateEst_FFT_4Hz. In general, how to let the system automatically determine which one to use these parameters?

  • 0
    TI__Genius 10730 points

    Hi Nancy,

    Thanks for reaching out! I am looking into this and will get back to you shortly.

    Thanks again,

    Angie

  • 0 in reply to Nancy Wang
    TI__Genius 10730 points

    Hi Nancy,

    We are still actively looking into this and will have an update soon. 

    Thank you,

    Angie

  • 0 in reply to Angie Mitchell
    TI__Genius 10730 points

    Hi Nancy,

    I have an update.

    The below two fields in the UART stream are the outputs after the bandpass filter that is used to separate the breathing and heart-beat waveforms.

     1.outputFilterBreathOut

     2.outputFilterHeartOut

    These values are obtained by scaling the output values from the bandpass filter by lambda/4pi as shown above.

    However, these values are "arbitrary unit (a.u.)" rather than mm. 

    There are several pre-processing steps (i.e. phase difference, IIR filtering) performed on the phase values which will impact the amplitude of the waveform. For example, if the values are at the stop band region of the IIR filter, the filter would attenuate the amplitude of the signal but obviously the actual physical chest displacement is not decreased.  

    To obtain accurate physical displacement some calibration/scaling would be required which is not implemented in the current demo.

    Thank you,

    Angie Mitchell