I love modern technology

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JR.
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Re: I love technology

Post by JR. » Tue Jul 21, 2020 10:25 pm

mediatechnology wrote:
Tue Jul 21, 2020 7:30 pm
I figure one LM339 per channel will give me adequate blinky lights.
I'm shocked, just shocked JR.
Welcome back from the dark side. :D
I'm not enthusiastic about the project but another 6-9 dB of level will be worth it.

The blinky lights were more useful for determining when the old decoder locked up, so maybe not really needed now.

=====

Here's another observation.. I think this new (cheap) decoder has even more propagation delay... on some sources I can easily see that the lip sync is way off (audio lagging)... of course might be program specific.

Back in the day it was major bux to delay video (expensive frame store), now I suspect its a couple dollars of ram... why don't the video sources offer a simple tweak in settings?

JR
Don't only half-ass tune your drums. Visit https://circularscience.com to hear what properly "cleared" drums sound like.

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mediatechnology
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Re: I love modern technology

Post by mediatechnology » Wed Jul 22, 2020 8:36 am

Back in the day it was major bux to delay video (expensive frame store), now I suspect its a couple dollars of ram... why don't the video sources offer a simple tweak in settings?
I use the audio offset setting in VLC.
It's in 50 ms chunks - I'd prefer frames.
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Re: I love modern technology

Post by JR. » Wed Jul 22, 2020 9:40 am

mediatechnology wrote:
Wed Jul 22, 2020 8:36 am
Back in the day it was major bux to delay video (expensive frame store), now I suspect its a couple dollars of ram... why don't the video sources offer a simple tweak in settings?
I use the audio offset setting in VLC.
It's in 50 ms chunks - I'd prefer frames.
I don't know what VLC is,,, can it move audio forward in time? My cheap audio decoder is introducing delay... I need to delay the video to sync... or just ignore it, it is only noticeable on tight shots of people's mouths while speaking. I can't complain too much this is only $32 and gives me remote volume control.

JR
Don't only half-ass tune your drums. Visit https://circularscience.com to hear what properly "cleared" drums sound like.

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Re: I love modern technology

Post by mediatechnology » Wed Jul 22, 2020 10:02 am

VLC is a product of Video LAN which is a stand-alone player.

It has both positive and negative audio offsets.
Wouldn't help you in your situation but you might want to install it on your Mac and PCs.
It will play just about anything.
https://ka-electronics.com

"States Ordered To Fraudulently Inflate COVID-19 Cases 15 Times Actual Rate"
https://banned.video/watch?id=5efab695672706002f367a0a
"Plandemic/Doctors In Black" https://proaudiodesignforum.com/content/Plandemic.mp4

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Re: I love modern technology

Post by JR. » Wed Jul 22, 2020 10:39 am

mediatechnology wrote:
Wed Jul 22, 2020 10:02 am
VLC is a product of Video LAN which is a stand-alone player.

It has both positive and negative audio offsets.
Wouldn't help you in your situation but you might want to install it on your Mac and PCs.
It will play just about anything.
I do not have an effects loop in my ROKU TV monitor that selects feeds from multiple places (including internet streams).

This is pretty far down the list of things for me to resolve, but thanks.

JR
Don't only half-ass tune your drums. Visit https://circularscience.com to hear what properly "cleared" drums sound like.

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Re: I love modern technology

Post by AnalogJoe » Wed Jul 22, 2020 2:15 pm

mediatechnology wrote:
Wed Jul 22, 2020 10:02 am
VLC is a product of Video LAN which is a stand-alone player.

It has both positive and negative audio offsets.
Wouldn't help you in your situation but you might want to install it on your Mac and PCs.
It will play just about anything.

+1 on VLC, a lot of players won't play stuff that VLC will, or they will ask me to buy a codec, yeah right :lol:

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Re: I love modern technology

Post by JR. » Fri Jul 24, 2020 11:25 am

I have decided to do one more experiment before I scratch out an active interface design.

In my current design I have simple pot attenuators on each amp input (unbalanced) all cranked full up. I like the capability to tweak balance if needed.

My next experiment is to hard wire the amp inputs to the unbalanced decoder outputs and see if the hum/buzz noise floor gets any quieter. Right now with the amp inputs floating they are dead silent. It is actually usable as is with current noise floor but now seems like a good time to experiment. Another experiment is to impedance balance the decoder outputs.

I'm sure I can improve things with differential circuit from the unbalanced decoder to active interface stage and then balanced (actually differential) output in my interface to the amp which gets me +6dB of easy voltage gain.

JR
Don't only half-ass tune your drums. Visit https://circularscience.com to hear what properly "cleared" drums sound like.

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