Playback Options... Number of Blocks as a control

[Instech87]

Can the Playback Mode… Playback Options… Number of Blocks be a control? I want to be able to set 1 block without having to calculate the appropriate Block Size (samples) based on the Sample Rate and current Number of Blocks. An additional control here may be Delta t in case I want to directly specify the delta time of my block size. The three values can all be controls. Changing the value of one of them recalculates and updates the value of the other two.

[Joel Khan]

Instech,

Usually when it comes to signal express controls and indicators cannot be modified. The number of blocks indicator is no differnt from the looks of it. I am posting a screenshot to help others who read this post to understand what we are talking about. It took me a while to recall what you were referring to. 

<Joel Khan | Applications Engineering | National Instruments | Rice University BSEE> 

[Instech87]

I had intended this post to be part of the "Post your improvement ideas & suggestions for future Signal Express releases" thread.  This is the first time I had posted to the Forum so I got it in the wrong place.  I later copied my post to the intended thread.  Thank you for your response.  Consider my original posting as a product improvement suggestion. 

[harsh08]

I have a logged data in signal express which i have sampled at 1000 hz and i have have 4326510 blocks with block size(samples) of 100.i want to see the data in 10 blocks and so i typed 43265100 in my block size and i get an error "Not enough memory to perform the operation " and closes the log file. Do i need to change any other setting or is this the limitation of signal express? Also i wanted to know as how can i see different blocks in the data view window

[Phil_J1]

Hi Harsh08,

I found this similar answer from a previous post (Message 6 at signal express import file size limit😞

SignalExpress is a 32-bit application, so it is subject to the normal 32-bit limitations, even on a 64-bit machine.  Internally, data is stored as IEEE double floating point (8 bytes/data point) in almost all cases.  In your case, this results in a 346MByte data set and although this should be possible, the moment SignalExpress has to interact with that Data and make a potential copy of it, the appplication very quickly hits a memory threshold.

[harsh08]

Thanks Phil for the reply.I made 100 blocks with block size of 4326500 and then went to the data view window but could only see the data from 1st block and was not able the data from other blocks when i used the scroll button.How can can i see the data from different blocks in signal express.

[Phil_J1]

So there are a couple of ways you can do this depending on what you're trying to achieve. Here is a screenshot of a couple of a few examples:

1) Both graphs are showing the same log. However, on the top graph, I told SignalExpress to show the entire log as shown in the right-click menu of the top display. The bottom graph is showing the data at time 0:00:00.00000 as shown by the timeline Time next to the red box. In this case, the bottom graph is showing the amount of data specified by the "block size" control in the screenshot near the top of this thread. The bottom graph is the equivalent of your own "1st block".

2) If we ignore the top graph for a minute because we want to use the "block size" control to govern the amount of data we see, the red box in the screenshot is showing you the Timeline Slider. By dragging this slider to the right, you will see the data that comes after. This is what it sounds you were looking for. As you move the slider, you'll see the Time indicator change to tell you the new start time of the data you'll be looking at. Note that this Time is relative to the start of the log; this is why it starts at 0:00:0.00000.

3) Also note that pressing the Run button on the toolbar will automatically run through data block by block, as configured in the playback options.

I don't know if you've had a chance to run through the SignalExpress Getting Started, but it does offer some great help regarding Playback mode, and so does the general SignalExpress Help.

I hope this answered your question...

Phil