DSP Robotics Support

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Hi tiffy
Just to clarify (and yes I read your detailed description, which is an abstraction of what I think most here already understand AGC to be), are you looking to modulate the varying levels within songs or between songs?

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Sorry, I probably shouldn't have used the word "modulate." I just meant it in the more general sense, as in automatically control the gain.

So if I'm interpreting correctly, what you're looking for is to adjust the volume levels between songs as opposed to within songs. You want song A to be as loud as song B, rather than wanting the quieter parts of song A to be as loud as the louder parts of song A. Correct?

In that case, the ideal would be to perform an analysis of the average loudness of the whole song, then tag that song with a value whereby your player can adjust itself each time it plays a new track. From what I've heard this kind of process is being used now in sites like Youtube and other streaming services.

[quote="MyCo"]The whole post doesn't make any sense at all.
1. Noise floor is not dynamic range, noise floor is a signal level/strength. He might mean Signal-Noise-Ratio (SNR) that is in the broadest sense a dynamic range
Signal to noise Ratio is whole different subject brother!

2. AGC is not about Magnitude, AGC is about perceived loudness.
Gain is a magnitude of POWER, perceived loudness is DYNAMIC RANGE, PROGRAM MATERIAL, SOURCE OF WHAT TOUR TRYING TO PULL OUT OF NOISE FLOOR BEFORE YOU GET NOTHING BUT NOISE! which is -66dBu interchangable as -40dB loudness, now loudness have lots of standards, PEAKING, R.M.S, MUSICAL WATTS, etc, lots of standards, simply we remember it as interchangeable standard as -66dBu, which would be 0.125 watts, etc this is USA,JAPANESE STANDARD, that will change your perception if you now use it whatever reference your using it for

3. decibels have nothing to do with frequencies. dB is just a ratio
dB is based upon frequencies, which is PROGRAM MATERIAL, dB is not just a ratio, if it were you can't simple pull NOISE, BACKGROUND, OR FRONT SOUND via RATIOS, ok, let me ask you a question? give me 600 watts amplifier connected via 8 ohms with 100 capacitance wire? calculate, can you calculate it? dB is not just a ratio of two things!

4. Noise floor has absolutely nothing to do with electronics. Just open your window and you'll notice a different noise floor than the one you have with closed window. It is just the loudness of the environment that you can not control.
vSOUND REINFORCEMENT have standards when calculating noise, it depends what noise your calculating, it's not limited to white, brown, pink, red, noises, etc. It depends what your calculating via which WEIGHTING and which standard and what Reference you have taken via which FREQUENCY (pc) reference via which Atomsphere (real life)

The fact that he doesn't provide any links to "the noise floor standard" he is claiming to exist, tells you all.

And the "no one cares about european standards" statement is just ridiculous. There is not a single professional audio gear, that's not using AES/EBU <-- see E in EBU means European and as far is I know Japanese use that too and don't have any own standards.

Patents noise floor or measuring noise is used in japan as C Weighting, but FBI, USA monitors sound which was changed to A-WEIGHTING SCALE via Referenced Frequency




First of all, all of you, please read this

LKFS is an abbreviation of: Loudness K-weighted Full Scale, and one unit of LKFS is equal to one dB. The LKFS term is used in the ITU BS.1770 standard and the ATSC A/85 standard also operates with this term. Other organizations, such as The European Broadcast Union (EBU), uses the term LUFS, which is an abbreviation ofLoudness Units Full Scale. Despite the different names, LFKS and LUFS are identical. Both terms describe the same phenomenon and just like LKFS, one unit of LUFS is equal to one dB.

LKFS/LUFS are absolute measures, and depending on which broadcast standard is in use, the loudness target level could be e.g. -24 LKFS or -23 LUFS. However, in order to aim for a more 'traditional number', a relative measure has been defined: Loudness Units (LU). Now, the broadcaster can set the target level (regardless of whether it is -23 or -24) to 0 LU, and again, one LU is equal to one dB.



Hope you almost read it 50 times to understand, what is going on! THIS IS EUROPEAN BROADCAST STANDARD, means it will not work in real time, i make power amplifiers, if you still don't beleive me, try to make one and it will blow the hell out of transformer or YOUR EXPENSIVE SPEAKERS ! again try to understand LU IS EQUAL to ONE DB , GET IT? Lu is being used as a reference, this is what we do when we are calculating extreme volts and sound power (whole different subject, just understand it as sum of powers) we use reference, ok say I use 1 volt as 1 dB reference, I say hey bro, hey yea you, I made this as a standard now when you isntall effect, speaker, re route, remember it as 1 dB via (what ever volt standard I use with it). GET IT?

Still don't believe me? your germany have senhizer company as I can recall it? ask them to show you a mixer, you will notice something written as -66 dBu or simply dB (which refers to loudness standard and what loudness you want to calculate) or 0:0 infinite (-40 dB loudness, ideal reference when your pulling something before nothing but noise), even though you can ask them about -66dBu or 0:0, which will exactly be the same what I told you!

Now let me clear you on another thing, LU is being used as on huge Wattages, Volts, Loads, that can never be interchangeable to anything different, example, I used -66 dBu (even check it on sound mixer yourself) that stuff is not interchangeable when I will be working in Conference Sound System, Broadcasting Systems, Sound Reinforcement Field covers:

PAS, Professional Audio, Public Address Sound, Conference Sound, Dj Sound, Ceiling Sound Systems. All have different formulas, it can not be interchangeable or can never be used all together, you can try and you will get something very different


Now another thing, why sound differs? It's not properly understood what micro PASCAL or JOULE pressure have been used? believe me WAVES PLUGINS have no clue on these things, I make plugins in Pakistan as a sound interface for lots of stuff to musician customers, I'm much famous here than WAVES, and I write as if plugin hardware dependent and if it's not hardware dependent when following true sound. Get it? that's what makes everything different, if properly used formulas, there is not way you will get even a slightly change in sound even though u programmed it in computer.

Now brother enough with lecture, I can't explain or convenience you more, see any sound company showroom there, ask to see sound mixers, note ranges, ask them about gain and what is automatic gain? go as a customer they will explain it exactly what I told you and the first thing I said about AGC will be PERFECTLY LOGICAL, that would exactly Genuine AGC.

Whoa, how much arognace can you put into a single post!
mking, you did an awful job of introducing yourself to the forum. Until you come up with some real content (read: nontrivial schematic) I will consider you but a troll,

Holly fuck... there is so much wrong.

So when you "define" a reference like you said for 1 volt, then this would be always at 0dB. Because the definition says:

The decibel (dB) is a logarithmic unit used to express the ratio between two values of a physical quantity,...

http://en.wikipedia.org/wiki/Decibel

Reference (voltage in this case) vs itself = 0dB

And what the fuck is a 100 capacitance wire?
All the other stuff sounds like bullshit bingo... I don't give a fuck and give up, maybe someone else could kick in as teacher...

mrking wrote: believe me WAVES PLUGINS have no clue on these things, I make plugins in Pakistan as a sound interface for lots of stuff to musician customers, I'm much famous here than WAVES, and I write as if plugin hardware dependent and if it's not hardware dependent when following true sound. [/b]

so you are much more famous then waves plugins - which is btw state of the art all around the world
so what are you doing here ?? sure you can share some very useful schematics ??

instead of disturbing the people here you could post a schematic how to do it the right way, should be no problem after 25 year pro experience and programming plugins better then waves!

this is the only way to delete you from my ignoring list...

I'm much famous here than WAVES

Made my day

Seriously, you are a troll, aren't you? I can not believe that someone who messes up dB (not a unit) with LU (btw: Loudness unit) and shortcuts dBu (unit = volts, reference = 0.7746) with dB (no unit, reference typically = 1) has any clue of what he's talking about.