question about adat A/D converter

vorien · Post by **vorien** » Fri Sep 28, 2001 6:38 pm

i use two Alesis Ai3 converter as input for my puldar 2.Does i need to set the master clock at 48Khz to avoid pop and click or 44.1 is also suitable?
i use nuendo and it seems that it don't reconise this frequency.
Can i have a diferent speed clock in pulsar settings and in nuendo(ex: 44.1 in pulsar and 48 khz in nuendo)
when i set nuendo to work as adat slave it loaded the default asio driver and not the scope one.Can someone explain me how to record in this configuration without pop or click cause i'm tired.

gelder_1 · Post by **gelder_1** » Sun Sep 30, 2001 8:50 pm

i use black alesis ADAT and fostex VC-8 as converters.
i use them at 44.1khz with cubase 3.7 and i have no problems at all.

try to move to 44.1khz and set one of them as master and the pulsar as slave. the only problem i had with clicks solved by changing these settings (master-slave).
good luck

vorien · Post by **vorien** » Mon Oct 01, 2001 8:09 am

the only way to use the adat as slave is to disconnect the digital input(boring cause in this case i can't use my 16 inputs and outputs at the same time).

but ok lets do that(if the converter in master mode avoid click)

now my pulsar is in slave and only 48khz is avaible in this mode.
in nuendo i suposed i have to set the ferquency slave to adat but when is load a projext with this settings nuendo don't load the project with the scope driver but with full duplex one.i have to change the driver manually.
so when i use scope driver and set pulsar as master how i change the samplerate in xtc mode cause the pulsar settings are no longer avaible and if i set it as something else other than 44.1khz nuendo refuse.
someone with an idea?

gelder_1 · Post by **gelder_1** » Tue Oct 02, 2001 11:38 am

since your ADAT is the master , pulsar will work on the same sample rate as the ADAT.

you should change the sample rate at your ADAT converter , i had the same problem and that was the solution.

piker · Post by **piker** » Sun Oct 07, 2001 4:30 am

If you have two 'adat A/D converters' (8channels each), and want to record 16 channels simultanously - wouldn't you have to set both of the converters to Master? Now this is not possible with Pulsar..

beatpete · Post by **beatpete** » Sun Oct 07, 2001 8:38 am

Pulsar sould be the master and both AI3s should sync via lightpipe to the pulsar.

piker · Post by **piker** » Sun Oct 07, 2001 7:24 pm

Yeah but if you are recording signals into polsar via A/D converters - you would have to make these the masters as the audio source is coming from them and not pulsar??

Funktastico · Post by **Funktastico** » Mon Oct 08, 2001 10:34 pm

No, it has nothing to do with which device is sending audio and which one is receiving.

A/D and D/A converters have to be playing by the same clock. Even a miss by one sample (there can be 44100, 48000, 96000,...x samples per second depending on samplerate) may produce unwanted clicks and pops. That's why one of the devices has to be the master that sends a clock signal to the other device(s), thus keeping them in sync.

Toni L.
http://www.mp3.com/NativeAlien

Funktastico · Post by **Funktastico** » Mon Oct 08, 2001 10:43 pm

... oh and only one device can be the master, other devices have to be configured as slaves. And there has to be a connection from the master's digital output to the slave's input.

piker · Post by **piker** » Tue Oct 09, 2001 4:01 am

ahh - thankyou so much. So why is everyone saying to make one A/D converter a Master? Wouldn't it be more simple to make Pulsar the Master all of the time? Also I am aware that when transfering from DAT machine to Pulsar via SPDIF or AES, you have to make the DAT the MASTER. And when you transfer from PUlsar to the DAT, Pulsar has to be MASTER. So why is it different for the A/D converters?

Funktastico · Post by **Funktastico** » Tue Oct 09, 2001 5:20 am

The point is the clock can go only down-stream in the cable. So if you only have a cable connected from the output of a DAT to the input on Pulsar, then the DAT would have to be the master. And vice versa.

If you have a cable connected both ways (input -> output and output -> input), both devices can be the master regardless of whether you are recording or playing with the DAT.

Or maybe some DATs don't want to be slaves, donno.

Toni L.
http://www.mp3.com/NativeAlien