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Not Correct log Sweep signal created.

Forum|Forum|1 day ago
April 27, 2026
4 replies
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I was trying to generate a logarithmic sweep (log sweep) signal. Specifically, I wanted to create a log sweep starting at 50 Hz and sweeping up to 15 kHz over 5 seconds, while maintaining a constant signal level of 0 dBFS from start to end.

Of course, I set up a 48 kHz sample rate with 32-bit float. However, when I check the generated file, the sweep clearly exceeds the intended 15 kHz limit and continues all the way up to nearly 20 kHz. Additionally, once it goes beyond 20 kHz, the level drops by about 3 dB and the signal continues at that reduced amplitude.

This issue doesn’t occur in other audio editing programs. I also tested it with Python code, and there were no such problems. So I’m wondering — why does this only happen in Adobe Audition?

Old manAuthor

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This is my settings. Please check this one.

SteveG_AudioMasters_

Community Expert

When you generate a sweep, the Frequency and Multiplier values are important, and will cause errors if set incorrectly. Importantly, the Multitplier value should remain at 1. At this point the Frequency value will be the same as the Base Frequency you have set. At the end of the sweep, if you copy the values from the start settings, all you will need to alter is the End Base Frequency, which should be transferred to the Frequency box in the Components selection at your final value (if it isn’t, then change it manually so that it is). The multiplier value remains at 1. If you set a duration, and do all of this, your sweep will be fine.

The important step in this is to make sure that the multiplier value at both ends is 1. Not doing this will cause all sorts of strange things to happen.

Old manAuthor

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Thanks for your detailed descriptions. Now it’s working well as expected. Thank you.

Old manAuthor

Participating Frequently

So strange. I can’t get those signals. Still the signal showed like this.

SteveG_AudioMasters_

Community Expert

Okay, tried it with a log sweep - it makes no difference:

Starts at 50Hz, ends at 15kHz. And I tried it at different sample rates and levels as well. Works fine with all of them, and in mono. So, how are you setting this up?