The De-Emphasis filter function issue

Hello,

Have you changed your system sample rate by closely following these steps?

FAQ: How do I change the sample rate of my SigmaStudio system?

There is no existing pre-emphasis filter in SigmaStudio and there is currently no plan to add one.

Hello

I have changed setting to 96KHz , if not through De-Emphasis filter that the sine tone (1 KHz tone) can listen at headset. Thank you.

If the de-emphasis filter cell is blocking the audio at a 96 kHz sample rate, then I think the cell was only designed to work at 48 kHz. Does this match your results?

Hello Paul,

Although the De-Emphasis Filter's response is not documented, it's easily revealed with the Stimulus-Probe tools:

This is a first-order pole-zero response. You can build your own complimentary Pre-Emphasis filter as shown below:

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The two filters together yield the desired flat response:

Best Regards,

Bob

Thanks, Bob!

Hello

Yes , but my system need work at 96KHz. Thank you for your help, Bob. Thank you.

Hello Paul,

Yes, there is something in the De-Emphasis block that prevents its use at 96 KHz -- it won't even simulate via Stimulus / Probe as other filters do at that sample rate. Generally, SigmaStudio automatically adjusts IIR filter coefficients for the sample rate in use -- apparently this feature is lacking with the De-Emphasis filter.

However, we can approximate the De-Emphasis filter's response with the few blocks shown below:

This has a response similar to the original De-Emphasis filter (compare the plot below to that of my first post), yet its General First-Order filter works at any sample rate:

Best Regards,

Bob

Hello Bob,

Thank you for your help. I will try it. Thank you.

Hello Paul,

How well did the workaround filter(s) perform for you?

Hi Robert

This filter is good performance at my application. Thank you for your help. Thank you.

Good to hear, thanks!

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EZ Admin