Re: [xwax-devel] new idea, no soundcard, almost 0 latency

[Albert S. <asa...@uw...>]

Hi Simone,

Unfortunately, I don't know assembly, nor do I have any experience with
PIC chips at the moment. Can you reuse parts of the xwax source for your
purpose?

Thanks,
Albert

On Sat, 2007-08-11 at 18:10 +0200, simone www.io-sound.org wrote:
> hi
> we take it from ourselves, mainly it s all my pal work, i ve given
> some input and i deal with the english translation and possibly will
> take the project over to implement a different time code; now we only
> have MTC and it s not good for DJing, my pal uses it to control
> sequencers and drum machines. 
> Will you be up to work a solution out to implement the Serato code in
> our project? we are actually looking for people to get involved and
> our project will and is open source, i am translating the comments of
> the Assembly code to English, after we will publish it. 
> Simone
> 
> On 8/11/07, Albert Santoni <asa...@uw...> wrote:
>         Hi Simone,
>         
>         Interesting concept. I'd like to see where you guys take it.
>         
>         I don't know much about the SMPTE timecode, but as far as I
>         can tell,
>         the Serato timecode is superior for the application of vinyl
>         control. 
>         
>         Since the Serato timecode is better than the Stanton one, I'll
>         just to
>         contrast SMPTE with that:
>         
>         SMPTE:
>         - 80 bits long
>         - relies on "frames"
>         - need to read several frames in order to determine the
>         direction/speed 
>         of the motion
>         (This is starting to sound similar to how the Stanton timecode
>         works)
>         
>         Serato:
>         - Uses a 20 bit LFSR (every 20 bits is unique)
>         - See
>         http://en.wikipedia.org/wiki/Linear_feedback_shift_register
>         - There's no such thing as "frames" - Any consecutive 20 bits
>         can be
>         used to determine the playback position instantly. As such,
>         the latency 
>         here is virtually unnoticeable.
>         - The left and right channels are encoded with the same
>         timecode (can be
>         used for error checking), but they're shifting 90 degrees out
>         of phase.
>         This allows you to determine the direction of the motion
>         extremely 
>         quickly.
>         
>         As for getting more info about the timecodes, there's some
>         details about
>         the Stanton timecode here:
>         http://en.wikipedia.org/wiki/Final_Scratch#Vinyl.2FCD_Time_Code
>         
>         Mark and myself are probably the only complete resource for
>         information
>         about the Serato timecode on the internet right now. (I
>         reverse
>         engineered it independently of Mark with a fellow in the U.S.)
>         
>         Mark - Maybe we should write up that paper I suggested back
>         May or
>         something? (It'll give people a good reference for
>         implementing their
>         own timecodes, etc.)
>         
>         Thanks,
>         Albert
>         
>         
>         On Sat, 2007-08-11 at 13:10 +0200, simone www.io-sound.org
>         wrote:
>         >
>         >
>         > hi
>         > i have a friend who is working in a new idea: he s pressed a
>         vinyl
>         > with a special code, it s simple encoder code.then he feeds
>         the
>         > turntable sound into a riia preamp, then it goes to a PIC
>         > microprocessor that transforms it into MTC code and sends it
>         out to a
>         > MIDI plug.So far with MTC code we can only target the place
>         in time 
>         > and START and STOP functions so no backward spin, anyway it
>         s just a
>         > start and i will take over the smpte implementation.
>         > I was wondering.. is the stanton or serato better than
>         smpte? where
>         > can i find the info for the codes? 
>         > simone
>         >
>         > --
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>         > becomes unbearable.
>         > fairly stolen from 0100101110101101.ORG
>         >
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> 
> 
> -- 
> Machines are far more interesting than men. They're less predictable,
> more complex. The Web is faster, more efficient, and farther reaching
> than any other means of communication. If you spend most of your time
> using the Internet, the slowness and inefficiency of the offline world
> becomes unbearable. 
> fairly stolen from 0100101110101101.ORG 
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