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Old 4th October 2011, 07:16 PM   #131
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I remember the yamaha loudness control! one store was advising to set the 'loudness' to flat, turn the volume up as loud as you can stand it with the main control and then attenuate down with the tiny 'loudness' knob instead of using the larger volume knob. not sure what yamaha recommended but I do remember them telling us (the customers) to use the tiny knob once the big knob was set.

since its just numbers in a mapping function, if there is code space, sure, why not

I do find myself adjusting the vol level of the sub and the idea of pure linear 1:1 tracking never quite made sense given how wide some music and movies vary in their use of lower frequencies and levels.
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Old 4th October 2011, 08:54 PM   #132
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I think this is the Yamaha loudness circuit (re-rendered from old notes) for sims...
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Old 4th October 2011, 08:57 PM   #133
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a silly thought, maybe: wonder if any of the digital pots would work out there?

then you could dial in the value you want under cpu control.
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Old 4th October 2011, 09:03 PM   #134
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I left out that it was driving a 250K balance pot.
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Old 4th October 2011, 10:08 PM   #135
Francec is offline Francec  Australia
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Quote:
a silly thought, maybe: wonder if any of the digital pots would work out there?
Since you are outputting a volume signal to increment/decrement a PGA, could that same signal be used to decrement/increment another PGA to provide the tone control?
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Old 4th October 2011, 11:12 PM   #136
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Quote:
Originally Posted by Francec View Post
Since you are outputting a volume signal to increment/decrement a PGA, could that same signal be used to decrement/increment another PGA to provide the tone control?
pga is not a digital pot, alone; it includes a buffer opamp stage attached to it. so that would not be directly useful in tone control. but audio quality true digital pots might. I have several still in static bags that I ordered for trial but have not connected yet.

there *are* dedicated tone control circuits of various grades out there. I think the modern chips all do dsp though, so they are not pure analog.

one thing I would like to do, eventually, is to mix down 5.1 to 2.0 via a series of analog summing stages with vol controls where needed in order to do the proper mix. I prefer to watch movies the old way (2 spkrs and a sub) but I'd like to be able to take a 5.1 analog decoded out and mix that down my way to 2.0. this is something I may play with in a future project.
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Old 4th October 2011, 11:36 PM   #137
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I was thinking the variable loudness circuit could be simmed, then the resulting curves programmed into a DSP.
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Old 5th October 2011, 06:08 PM   #138
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if there is a computer back-end and if you use it for music playback, its conceivable that a remote control could push requests *up* to the host at user control, and those would change filters on the pc. perhaps some media players have remote APIs for setting their EQ. as long as their effect was nearly realtime, it could be a neat thing to do.

for now, I think I'll see what its like to try just a simple linear mapping given 2 user set-points on my mains and subs. I'll see if I can proto this and if it works out, I'll report back.
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Old 14th September 2012, 08:36 AM   #139
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Perhaps this is off-topic but why are there resistors before the L/R outputs of the ebay PGA kits?
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Old 20th September 2012, 04:48 PM   #140
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Default why are there resistors before the L/R outputs of the ebay PGA kits?

Hello,

Standard procedure for opamp outputs is to place a small series resistor such as 100ohm. The Opamp outputs are usually very low impedance, adding a small series rsistance aids in stablity when using long cable lengths which increases the load capacitance.

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