How could I import HE-AAC file as 16 bit wav fle in Au?

[GOR30415928dwc0]

  I have some files, in HE-AAC format(converted from 16 bit wav). When I imported these files in Adobe Audition CC 2018, these files were converted to 32 bit wav file. If I save it as 24 or 16 bit wav file, it would cause quantization distortion. Are there any ideas about import aac file as 16 bit wav file?

[SteveG_AudioMasters_]

When you 'open' a HE-AAC file in Audition, what you are actually doing is decoding it to work in Audition's working format - 32-bit FP. At this point you have it in a lossless format, and almost certainly the best decode you'll get. Why? You've got a 128kb/s stream, and this is already going to be of relatively poor quality (very similar to an MP3 at the same rate). Nothing that happens in Audition in terms of reducing the bit depth is going to reduce the quality of that, and it's certainly not going to introduce quantization distortion, because for that to happen, there would have to be a major error in the conversion. And, if you look at the independant SRC comparison site, you'll find that all versions of Audition sit at the top of the league in this regard, and always have done - although a few of the others have finally caught up at last. Anyway, you have no worries on that score as, I'm afraid, your source is already compromised.

SRC comparison site 

[GOR30415928dwc0]

Thanks for your reply.

Sorry, my mistake. As you said, open a HE-AAC file and then save it as 16 bit wave file in Audition doesn't introduce quantization distortion.
But I found a problem. The mixdown file has noise(see attachments) when I insert HE-AAC file in Multitrack Session(24 or 16 bits)

感谢您的回复。

抱歉，是我弄错了。正如你所说，用Audition打开HE-AAC文件并保存为16位深度的WAV文件并不会产生量化失真的问题。
但我发现，当插入HE-AAC文件到多轨会话(24或16位深度)中，并导出缩混时，缩混文件会有底噪。

Original(32bit):

After Mixdown(in 16 bit Multitrack Session)

[GOR30415928dwc0]

[SteveG_AudioMasters_]

Hard to say without seeing the whole session, but I think that whatever that noise is, it's come from somewhere else. If it was the decoded AAC file, the noise would have carried on, but it appears to stop just after the file content appears, which rather suggests that it's not the file that is causing it.

[GOR30415928dwc0]

I just normalized the part of clip. Demonstration GD Link 

[GOR30415928dwc0]

Is it possible to download the rar file? What is that noise? Is that quantization distoration?

[SteveG_AudioMasters_]

Whatever it it, it won't be quantisation distortion, because that pretty much never happens these days - and if it does, it's quite subtle.