Open or closed source isn't the point here; the docs were released to us under NDA. We can't tell you how to operate the DSP, even though we'd like to.

Personally, as the 7705 has now been superceded, maybe philips will release more info if someone can get hold of the right person. We spent at least 3 months trying to get the docs even when we actually had bought 100s of the chips!

Hugo