How does the decoder retrieve the quantized samples in this loop?

please check the block diagram loop.
Attachments:
Decoder.vi ‏23 KB

Hi Mahady,
Looking at the encoder VI you posted I can see that there is a separate input called quantized samples. I am pretty sure the q[k] is an array of possible values that the input to the encoder may hold after being quantized. For each value in to the program that array is searched and the encoded value corresponds to the index position in the array. The output encoded array is optimized to take up as little memory as possible. The information is then sent as a digital waveform and as you say the decoder is the inverse of the encoder.
I have worked all this out by using the Context Help tool in LabVIEW and Highlight Execution. Both can really help to understand a VI that is not your own.
Can I ask where you got this VI from?
Jack. W
Applications Engineer
National Instruments

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How does waveform graph downsamples the data before it is plotted

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I'm interested in how does waveform graph downsamples the data before it is plotted and what algorithm is used for this purpose? My goal is to plot 30 plots that have 1M samples each and I would like to downsample them before plotting onto a graph. I tried several VIs/algorithms for resampling and none of them gave the same result as seen by waveform graph (when all the samples are plotted).
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Solved!
Go to Solution.
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WFGDownsampling.vi ‏19 KB

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LabVIEW draws plots in the way that draw every pixel affected by signal. So for example if there is zero-valued 1M samples and even one equals to 1, you will see the peak. That is the reason why you do not get the exactly same behavior comparing to interpolating. But if you set FIR as interpolation mode in Resample Waveforms (single shot).vi, result is really similar, but of course amplitude is 1000-times smaller than original one (because there is dt set to 1000). Keep also in mind that in Graph 2, there is different Y-scale and it should be considered as noise, not relevant data, I would expect 1000-times smaller amplitude as in Graph 3, it is many more times smaller.
I would also like to say something about downsampling (decimating) the data. If you have 1M samples, you can see the peak even that there is only one value. But bigger problem is that with this graph resolution (I guess that is not more than 1000px), it is problem to find position of this peak. It means that still the zoom is needed to know where the peak is. Usually, when there is that big set of data, you are extracting different data (statistical information, peaks in FFT, etc.) not just visual data in graph.
Mariaaa:
I do not understand your question, can you please describe more your needs? You mentioned saving the data into a file, you can use Write to Measurement File express VI or see Write to Text File.vi in Example Finder and try to appropriately modify it.
Best regards,
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How does the decoder retrieve the quantized samples in this loop?

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