Update

[cstrahm]

This should be the final incarnation, I certainly hope so. Wish lists are now closed. )

- I added a 2nd Output, A&B Outputs. It is often desirable when testing stereo equipment or sound systems to be able to mute L/R channels or reverse phase.

- I added three monitor BNC outputs on rear. These can be used for sync or oscilloscope. There are times when you may want to see if amplifier is clipping, high freq out of band components, oscillations, or syncing of other equipment.

- I added Time Domain digital audio sampling capability. Yes folks, you can consider this your Xmas present for 2010. Looking over the situation I realized it would not take a great deal more to add digital signal processing capability. The initial units will NOT include these features/modules, because I do not want to delay first production, but they can be added to any units later very easily. Do not know any costs yet, but expect they will be quite reasonable. The purpose here is to provide for this capability in advance by including the necessary design and infra-structure aspects in the main board.

This will enable synchronous sampling on all three inputs, all local sample memory. General specs will be 24b/216kHz max sample rates, selectable lower sampling rates, and sample lengths up to 1-4 Meg. Dynamic range of converters is about 120dB, so with analog autoranging gain/atten pre stages this yields over 160dB dynamic range. Very high performance, very high resolution. More details to follow later...

[Claus]

If I read correctly - this will kill some EU stuff.

I hope the Log-Sweep/chirp/what ever is included as a stimulus and The Farina stuff is included.

Good work, I am waiting !

-Claus

[werejaguar]

Wow!! this doesn't stop getting better!

So the analyser evolute to mixed domain. The module 'Digital Spectrum Analyser' calls my attention. Since it's time domain, It would be like a FFT analyser?

But at the other hand, at the analog domain, since you added true RMS detectors the analyser could do a true RMS spectral analysys like PCRTA?

I have understood the PCRTA is an analyser composed of a set 30 1/3 octave bandpass filters and 31 RMS detectors, one for each audio band.

The LX500 having a programmable filter and a RMS detector, could do the same as PCRTA 'sweeping' the bands? setting the filter to 1/3 octave bandpass, and perhaps better because the programmable filter allows to filter to smaller bands, giving better resolution.

[cstrahm]

Yes to all the above.

[Claus]

Originally Posted by cstrahm

Yes to all the above.

Ok.

One more.

Maybe the worst one.

Might be impossible:

When ?



-C

[cstrahm]

Yes that is the $64 question. My best guess is Jan/Feb. There are a lot of things yet to do, but it is certainly a lot closer now than it was 6 months ago. Hope to have prototypes done in the next few weeks, will post pics. We have backorders on this to the Moon. We just went through the order stack last week and we already have twice as many as we thought, enough for 2 production runs. They just keep coming in. So you can rest assured this is top priority. I won't get my life back until I get this thing shipping.

[Claus]

I would love to see the software, time domain especially...

I have used many a measurement software in my days, some good some not so good.
My current favourite comes from Norway.

[cstrahm]

That will be later, when the time doman features are released. Right now freq domain configuration is the first priority.

[werejaguar]

about time domain..., this machine will be able to digitize signals and display them on screen?, like a sound card?..

why did you put a FFT spectrum analyzer?, I think RMS sweeping on noise is much better

[cstrahm]

Yes you can do that, that's just looking at the raw sampled data. Freq domain and Time domain measurements do many similar things, but also different things. Too much to explain here, full documention will come later.