Digital MPX Forum

[sgeirk]

AES is a must have. I’m intrigued.

[Anonymous]

[quote author=”sigmacom”][quote author=”rocco123456″]Hello Boys…Hello Leif….!!!
Any news about Digital MPX Transmitter prototype…?????
Honever… i’im working on a spdif-qpsk converter…and qpsk-spdif converter…..to convert analogic link in digital link….

Thank you…

Rocco..

Look at http://www.elber.it/en/schede-fm-audio- … .php?id=31[/quote]
At the end of this week, maybe beggining/mid of next week, it will be completed.

Beside the D-MPX input, will also have analog MPX input, as some people requested.
I disagree with that, and I suggest to use D-MPX of course…

About your digital STL project, I’d love it if you use 64 or 256-QAM and reduce occupied BW.
That kind of STL is in my next plans, if you can do it, I would like to co-operate! 🙂[/quote]

If you guys need further coop. with FPGAs (Xilinx specially) – I’m in ! I have never dealt with DSP on FPGAs but I made some projects with ISE/EDK (Microblaze). The latest one was a full digital RGB LED display with DVI single-channel interface. The controller was implemented on a Spartan 3AN (X3S700AN) FPGA with an embedded Microblaze RISC processor for LCD/GUI processing.

Ricardo
Brazil

[yorkie98]

[quote author=”sigmacom”]
Well, it seems you’re lucky! 🙂 It provides:
– 1 digital electrical interface: XLR connector (selectable Unbal.75 / Bal.110 Ohm)
– 1 analog electrical interface: XLR connector (selectable Unbal.75 / Bal.110 Ohm)
– 1 optical interface: F05 connector (Toshlink – 5 mm)

It recognize AES3 and S/PDIF at any input (electrical or optical) up to 192k.[/quote]

Excellent! it covers all bases, some may have preferred an RCA (phono) interface for the electrical inputs but this in my mind would not be appropriate for a product with which we are aiming for "better than pro" results.
I’m personally going to most likely use the optical interface as my Emu-0404 has optical outs and I feel this should be a better interface than electrical. I also like the idea of having electrical isolation between the PC and the TX.

[Boki]

[quote author=”yorkie98″]I’m personally going to most likely use the optical interface as my Emu-0404 has optical outs and I feel this should be a better interface than electrical. I also like the idea of having electrical isolation between the PC and the TX.[/quote]

Usb or PCI version of 0404 ?
If you read this – PCI http://www.emu.com/products/product.asp?product=10447
USB – http://www.emu.com/products/product.asp … duct=15185
I don’t know how you will use optical output for MPX on e-mu0404.

I/O Configuration: PCI or USB ver.

Optical 24-bit/96kHz S/PDIF In/Out (switchable to AES/EBU)

[sigmacom]

@ricardogerassi
I am seeking proposals about digital STL. Can you contribute? 🙂
What about no-Microblaze, but pure, faster VHDL?

@yorkie98
Of course optical interface is better, but if your concern is galvanic isolation, the electrical AES3 input has 1:1 transformer.
As Boki already mentioned, there are not so many cards with optical out @ 192kHz. 🙁

[Anonymous]

[quote author=”sigmacom”]@ricardogerassi
I am seeking proposals about digital STL. Can you contribute? 🙂
What about no-Microblaze, but pure, faster VHDL?
[/quote]

I just mentioned Microblaze because I’ve used it as a GUI controller. On my case the video engine used dedicated features in the FPGA, i.e. hardware multipliers, dual-port block rams. Microblaze just did the "dirty" job of user interfacing, driving a LCD display, scanning buttons, dealing with UART and GPIO and storing user data like passwords and overall settings.

I will be more than happy to contribute in such an enterprise. Please check your PMs.

Ricardo
Brazil

[yorkie98]

I see the issue with the E-MU 0404 now, 96khz only on the digital outputs.
The ESI (Maya and Juli@) card do 192 on the RCA output so might go with one of these.
Does anyone know of a reasonably priced card which will do 192 on the optical?

[rocco123456]

Hello boys…!!!!!!…Any news about Digital MPX transmitter….????’…..

Thank you.
Rocco,…

[yorkie98]

I’m still patiently, but excitedly awaiting news from Sigmacom. I’m sure he’s perfecting the product before releasing it.

[sigmacom]

The D-MPX is ready, blame the "analog-MPX" input please!
It took me longer than estimated, sorry for that… 🙁

This Tuesday-Wednesday I am expecting one last ADC Evaluation Board to test.
After this, I’m done, and can start prototypes.

Thank you for your patience! 😳

[Boki]

No need for rush. easy is good 🙂

[camclone]

Yeap!
goooooooooooooood news!

But , sigmacom, please test it at the "real world" as soon as you are ready.

1) power impit ( 220 v , 110 v) stability of the switching power supply
2) rf power output stability of the 30 watt rf
3 ) overshoots…. ( analogue and digital omputs ) stability of sound system

let’s beta test it! ;P let’s get some FCC certificates!! let’s rock!!!

[yorkie98]

[quote author=”sigmacom”]The D-MPX is ready, blame the "analog-MPX" input please!
It took me longer than estimated, sorry for that… 🙁

This Tuesday-Wednesday I am expecting one last ADC Evaluation Board to test.
After this, I’m done, and can start prototypes.

Thank you for your patience! 😳[/quote]

No need to apologise, this is likely to be a HUGE leap forward in broadcasting quality and we are going to be the privileged few to try it. Of course you need to take the time to get this right and as we all know, things always take longer than you expect, its the way of the world.

I’m just so glad this is moving closer to becoming a reality. Can’t wait to get my hands on the prototype.

[rocco123456]

Hello boys…!!!!!!…Any news about Digital MPX transmitter….????’…..
Sound card…..etc………….

Thank you.
Rocco,…

MErry…. Cristhmas…..!!!!!

[yorkie98]

It seems to have all gone a bit quite regarding news on the exciter but I’m sure Sigmacom is busy working out any problems and bugs with it. Maybe it will be a very happy new year for us..

[Author]

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