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Confusion with the data in the RxBlock

Question asked by Quiwi on Mar 6, 2015
Latest reply on May 27, 2015 by jobo23

I am testing the example projects coming with the VDSP5.1, for the project "21489 AD1939 C Block-Based Talkthru 48 or 96 kHz" the input is sine wave of 1kHz.

 

A breakpoint is set in the function "void handleCodecData(unsigned int blockIndex)" to observe the input data stored in RxBlock_A0 and

RxBlock_A1. However, I am confused with the figure plotted with these data as shown below, the data format is int.

 

The TDM has four slots for receiver, so I decimate these data by four and replot the figure, but it is also not an entire sine waveform.

 

Could anyone give me some explanation on this?

 

Many thanks!

 

 

RxBlock.png

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