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Old 31st January 2011, 10:16 PM   #1
Francec is offline Francec  Australia
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Default ACTIVE loudness control

I've searched this forum (and the web via Google) for an ACTIVE loudness control.
Currently, I use a PGA2310 pre-amp (from Silicon Chip magazine) which I think is very good. It does not have either loudness or tone controls. What I was considering is an active loudness control that is dependent upon the pre-amp volume control, that is, the lower the volume the greater the loudness with it reducing as volume decreases. The level of loudness and the cut-off point able to be set by a control, such as a single pot or rotary encoder.
If this was based on a PGA2310 or similar, all the better.

My question is; does such a thing exist?


Frank
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Old 31st January 2011, 11:02 PM   #2
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Aiming for the same thing with a MiniDSP....

Equal Loudness Contour filter with MiniDSP. Can be done?

Not sure if it's been done yet....
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Old 31st January 2011, 11:14 PM   #3
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If you are adept at programming PICs etc. you can develop your own software to 'listen to' the PGA2310 volume data and map it into control data for an equalizer IC (in the same family as the PGA2310?). Then chain your equalizer IC and the PGA2310 et voila.
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Old 31st January 2011, 11:16 PM   #4
Francec is offline Francec  Australia
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I could if I was "adept at programming PICs etc".
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Old 31st January 2011, 11:18 PM   #5
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What is the source of the control data for the PGA2310 at the moment?
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Old 1st February 2011, 12:16 AM   #6
Francec is offline Francec  Australia
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It is an ATmega8515-8P programmed with code from the silicon Chip website.
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Old 2nd February 2011, 02:05 AM   #7
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You might check out the discussion here:

Reverse of the old Loudness Control

It may be useful for you to read the whole thread. Although it doesn't specifically discuss using DSP methods to implement a loudness control, it does discuss the control laws that the DSP would have to implement.
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Old 2nd February 2011, 04:38 AM   #8
Francec is offline Francec  Australia
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Thanks Don, if by DSP you mean control of the digital signal to achieve a loudness method of control then we aren't talking about the same thing.

Frank
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Old 2nd February 2011, 04:52 AM   #9
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Well...at least the Processing happens when you have to detect volume knob position ...
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Old 2nd February 2011, 07:19 PM   #10
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ST have a series of IC audio processors with volume, treble, bass and loudness (TDA7303). Unfortunately these are not in the same class as the PGA2310 in terms of THD (0.01% typ). They have source selectors for 3 inputs, and they're easy to control off a PIC or other micro, so they're quite attractive in some respects.

w
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