Different Sample Rates in one Project

Question

Hey there,

I did the following little experiment:

I imported a sound with a sampling frequency of 44.1kHz and one with 48kHz, created a play event for each and played both simultanously in an Unity test level.

I am wondering how this is possible, since I made sure that the Conversion Settings do not change either of the sound's sample rates. I was also able to play both sounds within Wwise without any problems (only the first time when I played them there was a short delay).

My interface meanwhile is running at 96kHz. So clearly all sound gets somehow converted to 96kHz, does anyone happen to know how and where?

Cheers and thank you in advance,

Christoph

Answer 1

Wwise internally run at a single sample rate, and if the source files are at different rates, it does real-time sample rate conversion to the internal rate. (all processing, mixing and effects are running at the same rate)

Please note the real-time sample rate is lower quality than the one you will find in the conversion settings, which is of very good quality. 

In general, it is always preferable to:

• Have all your original assets at the same sample rate (usually 48000)
• Lower sample rate in Wwise if you wish your asset take less space (usually only for low frequency content), to a multiple of the internal rate

If you can't have all your originals to the same rate, use the conversion settings to make them to the same rate.

 

Comments

Is it possible to change the internal sample rate of Wwise?

Anyway, how is it possible, that I am able to hear two events with different sample rates in Unity (with correct pitch)? I made sure, that the conversion settings do not change the sample rate, so there should be 2 sounds with different sample rates playing simultanously, which shouldn't be possible.

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Changing sample rate in Unity:
https://www.audiokinetic.com/library/edge/?source=Unity&id=pg_initialization_settings.html