Simulink data acquisition giving error when using signal analyzer

Hello,

I am aquiring live sound data from a pcb microphone connected to NI9234 using Simulink. At the same time I am using a power spectral desity estimator block.

It is giving me the following error

"Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is 1-by-103"

The error arises when i include the psd.

I have attached my settings.

thank you for your help in advance

Answer 1

[Ashutosh Thakur]

Hi Ferez,

The error message indicates that their is a mismatch between LHS and RHS of the assignment operation which causes difficulty in the assignment operation.

In order to troubleshoot this issue, please try to follow these steps:

• Check the output from the NI9234 block to analyze the dimensions to find id the issue is with a certain Simulink block or the Live data.
• Configure the PSD estimator block such that it is compatible with the frame size of the input signal.
• Also check if their is mismatch between the Sample Time could cause issue with the difference in size in LHS or RHS.
• Also make sure you have consistent data types between NI9234 and PSD block.

Also try to use the above steps incrementally to have a better understanding of the issue.

Kindly follow the links below to know more about the usage of the NI9234 device with Simulink:

https://www.mathworks.com/help/daq/discover-ni-devices-using-the-session-based-interface.html?searchHighlight=NI9234&s_tid=srchtitle_support_results_4_NI9234

I hope this helps you in troubleshooting the issue.