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Audio pcm width conversion: 16 to 24 bit

Started by "Ume...@gmail.com [audiodsp]" October 7, 2014
I want to convert 16 bit audio pcm samples to 24 bit pcm samples so that
when I process them in SRC or any other post processing algorithms it gives
better SNR.
My question is: Is there any other way to do 16 bit to 24 bit pcm width
conversion apart from left shift by 8 (multiply by 256).
Thanks