OverSampling

[Drnkhobo]

Hey guys have a look at the 6th post down from this page:

http://synthmaker.co.uk/forum/viewtopic.php?f=4&t=5971&st=0&sk=t&sd=a&hilit=oversampling+toolkit&start=30

Its bootsy's comment and attachment. He says

I've attached an example on how to use straight forward SSE packageing on the 4x Polyphase Upsampler when using two channels

Now if you look at his example, you see the packers & unpackers criss-crossing their 'flow lines' . . . WHY?
Whats the purpose, why not have the first 2 channels of the unpack match up with the first two of the pack?

Anyone have a clue why, or does it not really matter. . ?

[KG_is_back]

of you follow the packing closely, you can see, that it sorts the samples that channel 1 contains sample1, channel 2 contains next and so on...

[Drnkhobo]

Thanks KG, why the need to sort the samples though?

Why do you need to pack the first 2 mono streams into a 'packed' stream, then up sample, then unpack them to pack AGAIN. . ?

thanks for the feedback !

[KG_is_back]

It is merely a cosmetic thing. it is easier to write oversampled algorithm when you know the samples go in in right order.