OS-0522 Notice regarding malfunction of frequency differential and integral function of bundled octaves in FFT analysis

Thank you for your continued patronage of our products.

We have discovered a defect in the "OS-0522 FFT analysis function," an optional software for our Sound and Vibration Analysis System, O-Solution. We sincerely apologize for any inconvenience this may cause our customers.
Furthermore, we would like to report the cause of this incident, the measures taken, measures to prevent recurrence, and our response to the customer as follows.

Target Products

Details of the problem

In the graph window, repeating frequency differential and integral calculations using the following procedure will display incorrect results in the graph window. A similar problem also occurred in the tripartite graph function, which utilizes frequency differential and integral processing.

[Steps to Troubleshooting]

1. Register the FFT analysis results in the graph window, and then perform the following settings in the graph window.
   - Prioritize displaying average data checkbox: Set to ON
   • Data type: Set to 1/1 bundle octave or 1/3 bundle octave.
2. Frequency calculus: Choose one of the following: first derivative, second derivative, single integral, or double integral.
3. Frequency calculus: Set to OFF

When performing the above steps, the result of the frequency calculus: OFF procedure should ideally be displayed in step ③, but the frequency calculus processing result displayed in step ② remains displayed on the graph.
Therefore, if you set frequency calculus again in step 3 or later, the frequency calculus process will be performed again on the incorrectly displayed frequency calculus result, resulting in an incorrect graph being displayed afterward.

This bug caused a similar problem to occur in the tripartite graph function, which uses the same frequency differential and integral calculus processing internally.

Furthermore, when the incorrect data displayed on the graph after repeated frequency calculus processing was saved in CSV format, the output CSV file also contained incorrect results.
* Measurement data (DATX file) will be saved correctly.

① Register the FFT analysis results in the graph window and set them as follows in the graph window.

• Prioritize average data display: ON
• Data type: 1/1 bundle octave

② Set frequency calculus to single integral.

③ Set frequency calculus to OFF.

cause

In Ver. 4.5, a new frequency differential calculus process was added to the calculation section for the new calculation function between analysis result items. However, this also resulted in a change to the existing frequency differential calculus process, causing a bug. Furthermore, the same frequency differential calculus process is used when plotting the tripartite graph, which also caused a bug.

correspondence

Please install the updated software.
The corrected version will be Ver.4.5.5.
We apologize for the inconvenience, but please download the corrected software from our website.
Please install the corrected version and use the updated software.

Latest version release date: June 14, 2024 (Friday)
The issue will be fixed by installing the corrected software. The corrected version will be Ver. 4.5.5.
For details about the version update, please see the "Version Update History" on the download page and support page.

How to download

Clicking the "O-Solution DS-5000 Acoustic Sound and Vibration Analysis System System User Registration Download" button below will take you to the "Login/Download" page. If you are already a registered user, please proceed using the "Login" button. (If you are not yet registered, please proceed to "User Registration.")

preventive measure

We will review our design process and improve the quality of our reviews and tests to prevent recurrence. We appreciate your continued support.

Regarding inquiries

If you have any questions, please contact our customer service center orNearest branch officePlease contact us.