Digital Input on iMac

Hi all,
I'm currently waiting for my first iMac to be delivered. I want to record my Audient Mico preamp direct into my DAW via s/pdif direct into the iMac, so in the meantime i've ordered this cable:
http://www.lindy.ie/2m-spdif-digital-optical-cable-toslink-to-mini-optical/35222 .html
Can anyone confirm if this will work for what I want to do please?

Hi kessler182
Yes you may want two, both the iMac's Digital Input and Output are mini 3.5mm.
http://www.amazon.com/3-5MM-TOSLINK-FIBER-OPTIC-TOSLINK-mini-Toslink/dp/B00006LV F3/ref=sr11?ie=UTF8&s=electronics&qid=1283739190&sr=8-1
Dennis

Similar Messages

How many channels have digital input?

Hi, I want to know how many channels have the digital input of the intel mac mini. I have an digital input with six channels and I would like record in different tracks in garageband or other program. It's possible?
Thanks and excuse me for my english.
Mac Mini (Intel Core Solo) Mac OS X (10.4.6)

Welcome to the Apple Discussions!
I don't use GarageBand much, but I did a couple of searches. If you search the GarageBand forum, it is possible to import/record more than one or two tracks at a time. In fact, people have recorded six tracks with a USB/MIDI interface. HOWEVER, there is more to consider than just the ability of the software to do this. The processor and the hard drive will have to keep up. From what I found there, it seems the processor and hard drive of the Mac mini will not be able to keep up with six tracks. Apple uses some laptop components, like hard drives, to keep the Mac mini small. One sacrifice of smaller components is lower performance. If you're going to work on projects like that, the folks in the GarageBand forum might recommend an iMac. Your topic might be better suited for that forum, since digital optical audio for the Mac mini is brand new, there might not be many people here with much experience.
-Doug

Can't lock onto a 48k SPDIF (Toslink) digital input

I'm using a 'StarTech AA2SPDIF' A-to-D converter which has a fixed 48k sample rate. If I set the Mac's Digital Input to 48k it will work for a few seconds, then fall back to 44.1k. When this happens, the audio slows down and sounds much like a 45rpm record played back at 33rpm: i.e. the audio playback becomes slow and distorted. Normally I'd assume the A-D converter is bad, but other equipment I have is able to lock on to the 48k sample rate audio with no problem. The A-D also has a coax output and I tried that by running the signal through a coax-to-optical converter and then to the Mac. The results were the same. No problem returning the A-D and ordering another one, but as I said earlier, this one seems OK when run with other equipment. A web search found several others with the same problem (though different A-D's) with their Mac's. Unfortunately, no one found a solution. Any ideas?

I don't know about locking RAM, but strongly suggest that you contact Apple Service, iMac Service or Apple's Express Lane. Do note that if you have AppleCare's protection plan and you're within 50 miles (80 KM) of an Apple repair station, you're eligible for onsite repair since yours is a desktop machine. That might also apply to a new machine within it's first 90 days of use.

Optical digital input (S/PDIF) problem (sampling rates)

I have a huge problem with my 2009 iMac's digital input that I didn't run into on my older MacBook running the same OS (10.6.x), and it's driving me nuts!
Basically, I'm trying to record a digital feed from an ADC hooked up between my hand-built tube amps/turntable and my iMac, with the goal being the transfer of some of my LP records to 48/24 LPCM for archiving and editing. The ADC's output rate is fixed at 48000Hz and cannot be changed. My iMac, however, refuses to lock on to the device rate, instead forcing 44.1kHz in the audio/midi setup. In fact, I can't get it to do anything but 44.1kHz on anything I plug in (even my DAC's passthrough) despite the fact that I need to use 48kHz. The audio is correct for a few seconds, then forces back to the wrong rate again. No matter how many times I try, the computer insists on using the wrong sampling rate, which has rendered impossible any hope of using my iMac as an audio recorder.
I've tried setting up an aggregate device, but to no avail. Nothing I do seems to work, and since the problem is with Core Audio, any program used to catch the audio records gibberish. Is there a way to force Core Audio to use 48kHz in the terminal? It's not like the computer can't do it, as I get about 2 or 3 seconds of correct audio when changing the sampling rate manually. I just can't get it to stick!

Seeing the exact same thing here. External digital source is 48kHz, and this Mac Pro Desktop will only stay on that setting very temporarily (for about .10 or .15 seconds) then it reverts back to 44.1kHz. Even if I don't have a signal or even a Toslink cable plugged in to the input.
(I'm surprised you are getting 2 or 3 seconds of correct audio, when I'm getting about 1/10th that before it reverts back to the wrong sample rate. Maybe related to a buffer size option somewhere?)
I have tried every known option to reset or re-configure this, and even to the point of creating a new user, resetting PRAM, resetting SMC, etc. I was going to try upgrading to 10.6, thinking maybe it was a 10.5.x problem, but now I'm not sure that will help.
Had I the choice to set the setting to be 48kHz and lock it in, it should stay on that setting - (even if the chance exists that what I'm getting is not correct.)
More often than not, I know what I'm doing more than Mac OS does, and I want to force it to do what it needs to.
There really needs to be a "do it because I told you so" option for most of the Mac audio configuration system. This automatic "the hardware decided to do something for you" stuff is absolutely horrid for a system that is marketed as "Pro". A real "Pro" system would let me edit the configuration once, with the tool (text editor hopefully) of my choice, rather than attempting (and failing) to automate things.
+1 for another instance of this being "a huge problem" and "it's driving me nuts!"

Stanton T92 Turntable Digital Output to iMac connection

Hi,
I have a Stanton T92 Turntable that I would like to connect to my iMac (Mid-2011 Edition) so that I can listen to some records.
My turntable has a coaxle digital output as seen here:
http://cachepe.zzounds.com/media/quality,85/t92_back-f53efc70364b6f0face720a8feb e6d4c.jpg
I am aware that I need an optical mini-plug for the back of my iMac such as this:
http://www.amazon.com/gp/product/B0002JFN1A/ref=gno_cart_title_3
but I am confused on which converter I need to connect to my turntable.
I need to buy either a
Coaxial to Optical Digital Audio Converter
http://www.amazon.com/Cables-Go-40018-Coaxial-Converter/dp/B0002J2MV4/ref=pd_sim _e_4
or
Optical to Coaxial Digital Audio Converter
http://www.amazon.com/gp/product/B0002GV876/ref=gno_cart_title_1
Which one is the correct one?
Also, do I plug the toslink mini-plug into the output headphone jack and then configure the sound settings?
Thanks in advance!

The other option: Could I totally by-pass the digital input/output and just connect a Y-cable splitter from turn turntable to the iMac?
http://www.amazon.com/Belkin-Audio-Cable-Splitter-1-Mini/dp/B00004Z5CP/ref=sr_1_ 1?s=electronics&ie=UTF8&qid=1355212671&sr=1-1&keywords=rca+to+3.5mm
Thanks!

S/PDIF digital optical output imac intel 2.4 ghz core 2 duo

i checked in apple system profiler to see if i have an optical output available for my imac to connect for better sound quality to my new phillips blu ray home theater system. it appears that it does indeed have this type of output for high quality audio output
just wondering if this wire is the correct one i would use to connect my imac to my new phillips blu ray surround system? i checked my imac hardware settings and it says
S/PDIF OPTICAL DIGITAL AUDIO OUTPUT
Connection Combination Output
S/PDIF OPTICAL DIGITAL AUDIO INPUT
Connection Combination Input
i read in the manual for the phillips blu ray,that it has an OPTICAL INPUT for audio,would this wire work to simply connect from the imac to the stereo???
i found this wire on ebay that looks like it would be the correct one to connect the imac to the phillips blur ray Can somebody help me to confirm whether or not this wire will work and if i am even on the right track! Thank you very much for your help!!!
this is the ebay listing for the wire i think will work:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=160597409256#ht_1130wt_1141

even though i did just order the wire online, lets start over since you obviously know what your talking about when it comes to this kind of stuff.
i have a 2.4 ghz intel core 2 duo imac(i believe late 2007) running latest version of snow leopard 10.6.7
i used to have a killer phillips surround system300 watts that sounded great even though its petty to todays standards,i usually hooked it up with a cd/aux wire(headphone jack one side,red white other side) from the imac's headphone port to the stereo's aux input(red/white) but then my rabbit chewed the wires and speaker beyond repair,so i bought this brand new phillips blu ray system 100 watts thinking i would get much better sound while connected to my imac while playing movies,games etc. but once i hooked it up like i used with the older system,it sounds basically the same,only slightly better,when it should be 700 watts better! but i figured i was doing something wrong wince the imac has all these crazy better quality output ports and the new system has all these crazy better input methods. dont want to sound ********,i do know a lot about basic audio,editing and all things computers! anyways, i was poking around with the system profiler application and noticed it said the S/PDIF output mode was available and the imac had a digital output capability. i also noticed in the manual for the phillips that it said something about a coaxial/digital input and thus i thought by buying a special wire i need to make the connection i would get much better clearer or ever dolby or dts audio output,which most of the blu rays and games i play on my mac have. so basically i have all the necessary components except for the wire to achieve this dream of mine. thats where you came in to help,thank GOD!
Here is the link for the exact model i ordered from walmart and already have set up and connected via the old method as we speak.
http://www.walmart.com/ip/Philips-Blu-ray-Home-Theater-System-HTS3251B-F7/160049 41
by comparing the player with the imac i have can you tell me if i am on the right track as i thought i was before?? Or what would you suggest i do to get better or the correct high def sound out of the imac from whatever is playing and to play out of the new phillips blu ray system i just bought. Thank you very much for all your time and helping me with what should be an easy, simple problem.

Usb 6009 digital input

Dear All!!
With the following vi. I'm trying to receive a 5V signal in a digital input, using a usb-6009 device.
I would like to use the 5 VCC supply, available in pin 31 of the same device and send it to pin 17, representing line0 of port0. During execution, 'm physically connecting and disconnecting these pins in order to see the difference in a led indicator. Unfortunatelly, the led is always on, even if both pins are disconnected.
Could somebody help me? I would be very pleased.
Thank you very much in advance,
Miren
Attachments:
proof.vi ‏38 KB

Hi Miren,
"the led is always on, even if both pins are disconnected"
RTFM?!
They use open collector inputs with an internal pullup resistor of 4.7k, so you actively have to pull down the input to GND to see a difference...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

How to acquire serial data on a digital input line with good performance?

Hello,
we have a performance problem with our realtime controller. Our objective is, to read a 24-bit long digital waveform from a digital input line. To do this, we supply a clock signal (236 KHz) to the PFI1 Line of our DAQ Board. On each rising edge of the clock, a new bit is set on the digital input DI0.
Our hardware which transmits the data, is triggered through a digital output from our realtime controller. On each edge on this output, the hardware starts a serial transmission of 24-Bits.
Everything works fine except the bad performance of our realtime controller. We want to acquire the 24-Bits in a 1ms timed loop. To measure performance we wrote a test program. In that, we only triggered the hardware and transfered the data to the realtime controller. The task which is doing this job, has a approx. CPU-Load of 30%, which is, in my humble opinion, very high. The task is not waiting for data or anything else! We have earlier implemented a control which is also using a 1ms timed loop. This control is sampling 2 analog input signals, 2 counters. Futhermore it's sending telegrams with CAN and doing many calculations. The strange thing is, this much huger program has a CPU-Load of 25%. Does anybody know where the problem is?
For the better understandig I attached our test-program to this text.
We're using:
PXI-8175 realtime controler
PXI-6221 Multifunction DAQ
Thanks!
Regards,
Crest!
Attachments:
dig_test.zip ‏51 KB

Hello,
First of all 30% CPU-Load is normal because the DAQmx-driver needs a lot of resources.
In your programm you should place a wait (for example with 1ms) into the while-loop which causes
lower CPU-Load.
If this is not enough you should build your vi like in the following example.
Regards,
Christian
Attachments:
Read Dig Port.vi ‏51 KB

How can i connect 24VDC to digital input (usb 6008)

hello,
how can i connect 24VDC to digital input (usb 6008), is it possible with some optocoupler?
thanks

The 6008 is a static DIO, so speed shouldn't be an issue. Therefore an optocoupler should work. Just make sure you get one the meets your specs.
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Is it possible to input itunes into DVI/HDCP input from imac with Apple mini display portS?

Is it possible to input itunes into DVI/HDCP input from imac with Apple mini display port? Or is there another way?

The problem with itunes is needing a computer running it. or continuous internet connection.
A Time Capsule is AC mains powered.. no battery. Although you can certainly buy an older Gen4 TC and modify it ...
https://sites.google.com/site/lapastenague/time-capsule-power-supply-repair-kits
I have run my TC on a 12V SLA battery.. which would neatly meet that part of the functionality you want. But it is heavy and not really the rugged sort of device I think you want.
But I would look at other media players and other ways of storing movies than iTunes.. if you want to carry the whole lot around with you .. A bunch of SD cards even you could plug into the ipad??
External storage for iPad?
A small cheap PC/Mac laptop with a 1TB hard disk in it.. and 11" or 13" screen.. can often be a much better solution than lugging around multiple items so you can fit Apple devices into your life.

Audigy 4 Pro digital input 16 - 24

I have a Sony MDS-JB920 minidisc deck hooked up to my Audigy 4 Pro through the external box. Works fine.
However, the Minidisc deck allows one to set both the digital input and output to either 6, 20 or 24 bit. As the Audigy 4 Pro is 24 bit, I've set the deck to 24 bit for both in and out. So far no problems. If I watch the settings panel whilst playing a minidisc however, it indicates that the signal coming from the MD deck is 6 bit, although the deck is set to supply 24 bit through the SPDIF out.
When I put the MD deck on rec mode whilst the PC is supplying audio feed, the MD deck loops it back to the SPDIF input of the Audigy and then the software does display 24 bit signal coming from the MD deck.
This is very confusing to me, does anyone have an explanation?

CMSS is an effect used for stereo sounds, to emulate surround sound for them. It has no effect on the DVDs you're playing as you're just outputting the AC3 signal so the speakers can decode it.
If you're using a digital connection, then CMSS will not have any effect for other sound either, you need to connect through multiple analog connections to get that sound. A standard digital connection (coaxial and optical SPDIF) can only pass over either a stereo PCM signal, or an encoded AC3 stream (like on your DVDs). Normal sound like music or games will only be passed over as stereo PCM, so there is no CMSS effect there.
If you can connect your amplifier through several analog connections, then you can use CMSS aswell, otherwise your amplifier might have it's own upmix option like ProLogic.
Cat

How to I connect Sourcing digital output from My Interface Board to NI USB 6501 channel configured as Digital input

When I connect an input to DI channel of USB 6501 card from my board which has sourcing Output t, iIn the Off state it is not pulled down properly. The volatge on the port in is 2.1V -2.5V based on the pull down resistor on my board. I suspect that it acts as a voltage divider.
The state on the card is still show as "HIGH "state, even my sourcing output driver has a pull down resister. when I use this interface board for PCI mseries devices it works fine. Do the pull down resister on my sourcing output is not worth. Is this because of pull up resister 4.7k inside USB card 6501.
USB 6501 specifications shows the Digital input accepts both source and sink modes. By default the card is in sourcing digital input mode. How do we can convert this in Sinkind digital input mode.
Could anyone Please give your suggestions to overcome this issue .
Thanks you.

You really should not have both a pull up and pull down on the same line. Really weird things can happen. If you insist on having a pull down on your board, then I highly recommend putting a digital buffer chip between the DAQ and your board.
Some boards with DIO have a pull up, while others have pull down. You just have to watch the specs.
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I was given an assingment, but have no idea where to begin. The assingment is to create a text file using notepad with all of my digital inputs and some how make those imputs show up on my digital indicators on my control pannel

I was given an assingment, but have no idea where to begin. The assingment is to create a text file using notepad with all of my digital inputs and some how make those imputs show up on my digital indicators on my control pannel.
When it was explained to me it didn't sound to hard of a task, I have no LabVIEW experience and the tutortial sucks.

StevenD: FYI, I did NOT give you the one star rating. I would never do that!
StevenD wrote:
Ow. Someone is grumpy today.
Well, this is an assignment, so it is probably homework.
Why else would anyone give HIM such an assigment, after all he has no LabVIEW experience and the tutorials are too hard for him?
This would make no sense unless all of it was just covered in class!
This is not a free homework service with instant gratification.
OK! Let's do it step by step. I assume you already have a VI with the digital indicators.
"...but have no idea where to begin".
open notepad.
decide on a format, possibly one line per indicator.
type the document.
close notepad.
open LabVIEW.
Open the existing VI with all the indicators.
(are you still following?)
look at the diagram.
Who made the program?
Does the code make sense so far?
Is it a statemachine or just a bunch of crisscrossed wires?
Where do you want to add the file read?
How should the file be read (after pressing a read button, at the start of the program ,etc.)
See how far you get!
Message Edited by altenbach on 06-24-2008 11:23 AM
LabVIEW Champion . Do more with less code and in less time .

Triggering an event with a digital input

Hello all,
I'm writing my first Labview program. I used an architecture I found on the forums here, and it has been very helpful in getting me started. This architecture uses two while loops, one containing an event structure and one containing a case structure. (This is a queued state machine architecture, I believe).
Part way through the programming, we decided we needed a sensor to make sure the part was in the test fixture during the test. If the part is removed during the test, we'd like to safely stop the test. So basically, I need to monitor a digital input (on an NI-USB-6525 module) and enter the "Stop" case if the digital input turns off. I would also like to make sure this digital input is on before entering the "Start" case. I don't care if the input changes state when the test is not running, nor do I care about its state during the "Exit" case.
I'm really not sure how to add this functionality to my "stop" case. I don't even know if it's possible. I've been researching DAQmx events, but I haven't found an example or answer that aligns with my particular problem.
I've attached my code. It's incomplete right now - I still have a large number of steps to add. I wanted to get this issue figured out before I programmed any more steps. A preview of the code showing the basic architecture is shown in the picture below.
Does anyone have any ideas or suggestions for me, or questions if my problem is unclear? Also, if you see anything else in my code that will be problematic, please let me know.
Thanks in advance!
Attachments:
Main_Loop_072412.vi ‏195 KB

I should also add that I looked into event dynamic registration, but it seemed incompatible with my issue. I don't want my top loop to run only when an event triggers it - I want it to run all the time so that it can immediately respond to button presses. Also, most of the triggering I found was based on value change. I care about the actual value, not just that it changed.
I don't want to do anything that will bog the code down too much since it is important that the system respond immediately to inputs, especially to the stop or exit button presses.
I'm sure I am missing something very basic here. I'm used to ladder logic, where everything is simple and straightforward.

Digital Input Cannot Display this Video Mode Optimum Resolution 1280 x 1024 60hz.

HP Pavilion h8-1360t, Windows7 home premium 64-bit, AMD Radeon HD 7570 graphics card.
error message: Digital Input Cannot Display this Video Mode Optimum Resolution 1280 x 1024 60hz.
I get the error message as soon as Windows opens and the desktop displays. Then it goes black with that message. I've been using the computer for awhile and I had it so that when I maximized a window it would go across both screens. I have two monitors on the graphics card. Somehow I changed the settings so that a program would maximize to one monitor or the other. That is how I want it to work. Maybe I activated HydraVision. Now I have the problem when I start.
Also now when I boot to Safe Mode I get the message that there is no AMD graphics driver installed, or it is not functioning properly. I have tried to update it and the computer tells me I have the most recent version installed. I would like to uninstall it and reinstall it, but I'm a little worried I won't get it installed and be without video. Something like that happened to me once before years ago.
Could someone tell me what I should do please?
Thanks,
Jim Allen

HP support is here:
http://www8.hp.com/us/en/contact-hp/contact.html
In safe mode you should uninstall the driver, then try to boot normal again.
Then check if driver was installed by win7.
If not go go AMD website and download latest driver for your card.
V.
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Digital Input on iMac

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