PC Based SQ DECODING - ALMOST DONE!

[jdmack]

Check post #147 above for the best SQ script. I use it all the time and it's excellent. It is for AA2.0

I'm curious about something. I'm still using AA 1.5, and while the 1.5 script works really well as far as separation goes, it softens the attack of instruments like solo piano and snare drum hits. Does the 2.0 script work better in this regard?

J. D.

 

[proufo]

I'm working on it...

Looking forward to it! Thanks, Dylan.

I'd guess the tricky parts are to decode the FM signal and then to decode it well. I'd would also expect that some things we think we know about CD-4, such as frequency response, will be challenged by the results of this development.

 

[Dylan Berichon]

Looking forward to it! Thanks, Dylan.

I'd guess the tricky parts are to decode the FM signal and then to decode it well. I'd would also expect that some things we think we know about CD-4, such as frequency response, will be challenged by the results of this development.

There are a number of factors that make software CD-4 tough.

Having a sound card that can cleanly record frequencies high enough is just the start.

Then once the carrier signal is decoded, the next trick is applying the proper type of noise reduction and processing to the F-R signal.

Like I said... I'm working on it (along with the help of another engineer friend of mine), but it's going to be quite some time before I make any real progress.

 

[bming]

I am able to buy Adobe Audition Version 1.5 fairly cheaply and am tempted to experiment with PC based SQ decoding. Can you tell me if this version of Audition is suitable and if so, could you point me to the correct script to use. the zip file at post 47 as I understand it is for Version 2 only

 

[jdmack]

I am able to buy Adobe Audition Version 1.5 fairly cheaply and am tempted to experiment with PC based SQ decoding. Can you tell me if this version of Audition is suitable and if so, could you point me to the correct script to use. the zip file at post 47 as I understand it is for Version 2 only

Go to message #54 in this thread. Copy the script information to a notepad file and save. Change the extension of the file from .txt to .scp. Put the file in you "scripts" subdirectory in the Audition directory. Be sure to follow the instructions at the beginning of message #54 as well.

J. D.

 

[bming]

I followed the instructions on message 54 -created the front.wav and rear.wav files in c:\sq. After I run the script are these files modified and resaved in the modified form. In other words, are the files different after I run the script or do I need to do something to save the modified files.
Aslo how can I get for mono files from 2 stereo ones in Audiotn 1.5.

Hope you can help

 

[jdmack]

I followed the instructions on message 54 -created the front.wav and rear.wav files in c:\sq. After I run the script are these files modified and resaved in the modified form. In other words, are the files different after I run the script or do I need to do something to save the modified files.
Aslo how can I get for mono files from 2 stereo ones in Audiotn 1.5.

Hope you can help

Go to the multitrack screen in Adobe Audition. Insert front.wav into track one and rear.wav into track 2. Press CTRL-E to open the multichannel encoder. Select track one, and then from the drop-down menu under "panning assignment" choose "FL + FR, Stereo." Then select track 2 and from the drop-down menu under "panning assignment" choose "Ls + Rs, Stereo." Next, press the "export" button. On the next screen, you can choose 6 mono files, or one 6-channel file.

Of course, this will output your entire album as a single file. If you want each song to be an individual track, you'll have to do some splitting of the .wavs in the multitrack screen.

Hope this helps.

J. D.

 

[Bob Romano]

I'm curious about something. I'm still using AA 1.5, and while the 1.5 script works really well as far as separation goes, it softens the attack of instruments like solo piano and snare drum hits. Does the 2.0 script work better in this regard?

J. D.

I still hear a slight bit of softness in the attacks but nothing glaring. Still, it is about twice as fast using AA2.0 vs 1.5 with as good or better results IMO.

Can someone tell me how to open up the spectral decay all the way on the SQ script. Which setting would I change for each of the wavs? Sometimes, for me, that fixes some of the softness of the attacks.

 

[bming]

this is what I have done:
record the SQ record in stereo using Adobe 1.5
normalise it +6db and save it as C:\sq\front.wav
Saved it again as C:\sq\rear.wav
Run macro
After completion of macro checked to see if the saved files have been modified -find that they have not been
Now this is where I am confused. what did that macro do and what did it do it to. Am I suppose to resave something manually - do I work with what is actually loaded in Audition (only one stereo track is loaded) What is the point of reloading the saved files as as far as I can tell they were not modified by the macro.
I think I need step boy sdep instructions with more steps.

Also do I need to convert it to 32 res even if I recorded the track using Audition

regards Confused Brian

Go to the multitrack screen in Adobe Audition. Insert front.wav into track one and rear.wav into track 2. Press CTRL-E to open the multichannel encoder. Select track one, and then from the drop-down menu under "panning assignment" choose "FL + FR, Stereo." Then select track 2 and from the drop-down menu under "panning assignment" choose "Ls + Rs, Stereo." Next, press the "export" button. On the next screen, you can choose 6 mono files, or one 6-channel file.

Of course, this will output your entire album as a single file. If you want each song to be an individual track, you'll have to do some splitting of the .wavs in the multitrack screen.

Hope this helps.

J. D.

 

[jdmack]

this is what I have done:
record the SQ record in stereo using Adobe 1.5
normalise it +6db and save it as C:\sq\front.wav
Saved it again as C:\sq\rear.wav
Run macro
After completion of macro checked to see if the saved files have been modified -find that they have not been
Now this is where I am confused. what did that macro do and what did it do it to. Am I suppose to resave something manually - do I work with what is actually loaded in Audition (only one stereo track is loaded) What is the point of reloading the saved files as as far as I can tell they were not modified by the macro.

Once the script has completed running, both front.wav and rear.wav should still be open. It is at this point that you should switch over to the multitrack view, and insert front.wav into track one and rear.wav into track two. You could save both files first if you'd like, and it's probably a good idea, but it's not absoutely necessary.

Often, there does not appear to be much difference between the front and rear signals. If you haven't already, I would recommend downloading the sqtones.mp3 file, which is linked in message 86 of this thread. With this file, you can more easily tell if your script is working.

J. D.

 

[bming]

Tried it again. before running the script you are ask to save the 2 channel encoded file first as front.wav then rear.wav. After you do this you have one stereo track in your Audition called rear.wav. After I finish running the script I am still left with only one stereo track called rear.wav. Going into multitrack mode still only leaves one processed strereo track. There would be no point in inserting the previously saved front.wav as it is not processed ot modified by the script. It is obvious that I am missing something here. Are there new versions of the front.wav and rear.wav saved elsewhere.

Once the script has completed running, both front.wav and rear.wav should still be open. It is at this point that you should switch over to the multitrack view, and insert front.wav into track one and rear.wav into track two. You could save both files first if you'd like, and it's probably a good idea, but it's not absoutely necessary.

Often, there does not appear to be much difference between the front and rear signals. If you haven't already, I would recommend downloading the sqtones.mp3 file, which is linked in message 86 of this thread. With this file, you can more easily tell if your script is working.

J. D.

 

[jdmack]

Tried it again. before running the script you are ask to save the 2 channel encoded file first as front.wav then rear.wav. After you do this you have one stereo track in your Audition called rear.wav. After I finish running the script I am still left with only one stereo track called rear.wav. Going into multitrack mode still only leaves one processed strereo track. There would be no point in inserting the previously saved front.wav as it is not processed ot modified by the script. It is obvious that I am missing something here. Are there new versions of the front.wav and rear.wav saved elsewhere.

The only thing I see that you are doing different from me is you are not closing "rear.wav" before running the script. Try closing all open files, and then run the script. The script will open the files that it needs to process.

If that doesn't work, post here and I will try another idea.

J. D.

 

[bming]

You're right, that is what I was doing wrong. I tried the test tones and I can clearly see the difference between the front and rear channels.
Thanks for all your help and patience.
:banana:

The only thing I see that you are doing different from me is you are not closing "rear.wav" before running the script. Try closing all open files, and then run the script. The script will open the files that it needs to process.

If that doesn't work, post here and I will try another idea.

J. D.

 

[jdmack]

Thanks for all your help and patience.
:banana:

You're very welcome! I'm happy to hear that it's working now!

J. D.

 

[jfquad]

Thanks, I've started to use the script and the results are very good so far. I can see this taking up way too much of my time from this moment on!

James

Hi again... running into some problems (which may have been discussed before, so sorry about that if they have)... using the AA2 SQ script I end up with two stereo files, front and rear. The separation/stereo imaging within the 2 files is excellent and points to "near discrete" channels........

However, when I combine the 2 stereo files as quad, there is a definite phase mismatch between front and back. This is easy to reproduce if I insert, say, front left and rear left into a multitrack session in AA2, and pan them left and right, as though they were a "stereo pair". The stereo effect from doing this is definitely out-of-phase.

Now then, while I'm technically out of my depth here, it looks like the rear channels need to have their phase flipped by 180 degrees to bring them into phase with the front channels.

Is this correct or am I doing something wrong earlier on in the process?

Please help as I want to make sure I get this right before burning a stack of DVD Audio discs!!!!

Thanks,
JF

 

[stoty50134]

Would it be possible to play a quadraphonic LP through a decoder and record the four channels into a computer-based multi-track recording program and burn a DVD-A disc from that?

 

[JonUrban]

Would it be possible to play a quadraphonic LP through a decoder and record the four channels into a computer-based multi-track recording program and burn a DVD-A disc from that?

Of course! We do it all the time!

There are quite a few DVD-A authoring packages available. I think the cheapest is Circline or something like that. DiscWelder is what I use, and it starts at $99 list.

You can also record the SQ LP in stereo, then decode it with a script in Adobe Audition. Read the forum threads and you'll discover a lot!

 

[Old Quad Guy]

I own Surcode for DTS encoding. I just downloaded AA 1.5 for free from Adobe's website (trial software). I am using the script from post # 54 and it works great except for one thing - the rears are louder than the fronts. I might not be normalizing the file properly.
How do I raise the volume on the fronts (front.wav) and by how much?

Great job to all who worked on this!

 

[jdmack]

Old Quad Guy, did you follow step 5 in post #54. That step suggests raising the fronts by 3 db.

J. D.

 

[Old Quad Guy]

Woops. I got so into this I stayed up all night until 5 AM.
I used Edit>Adjust Audio Clip Volume and typed in 3.0 and that seems to do the trick. Thanks J. D.

BTW - Has anyone posted in this or any thread the QS script? Thanks!