[linux-audio-user] Re: Sample Rates / Sample Sizes

[Mark Knecht]

Steve Harris wrote:
> On Thu, Jun 24, 2004 at 07:51:04 -0700, Mark Knecht wrote:
> 
>>I'm sure you're right Rick. I was looking at some technical dither stuff 
>>yesterday. The noise floor different dithering plugins insert is not 
>>flat, or the same, over frequency, so that could certainly effect 
>>different types of music differently. I don't have a clue what the 
>>LADSPA dithering solutions are doing in this respect.
> 
> 
> AFAIK there aren't any LADSPA dither plugins. Its very dependent on how
> the float output is converted to int before sending to the card, and
> LADSPA doesnt define that, so it doesnt make a huge ammount of sense.
> 
> - Steve
> 
> 

Steve,
    I misspoke really. I guess I should have just said Linux/Alsa/Jack 
dithering solutions. It's sort of immaterial to me whether dither is 
done within LADSPA as an output plugin in Ardour or done somewhere else 
like Jamin where maybe it's totally built in. My comment was intended to 
acknowledge my lack of specific technical knowledge in the environment 
that most people on this list work in. Clearly the idea that there is a 
float t int conversaion taking place is I guess pretty obvious when you 
talk about dithering, even to me, but LADSPA internals are certainly not 
my forte! ;-)

    Thanks for the clarifications though. It does raise an interesting 
difference between something like Ardour, I guess, and Pro Tools where I 
can insert a dithering plugin pretty much anyplace in the signal chain 
if I choose to. Maybe the RTAS standard makes some decision to go to int 
based on where the output is going? I don't know.

Cheers,
Mark