Yes you need to add the pre-emphasis before the limiter and them add de-emphasis after. Then the transmitter add it back in and the receiver takes it out.If I made any limiter, simply can't I add 51k+100nf in series for Asian pre-emphasis (around 50uS)?
another hard calculation then. Cant I remove pre-emphasis from FM tx and use before limiter for simple?Yes you need to add the pre-emphasis before the limiter and them add de-emphasis after.
Yeah, feeling like to cry like a baby... Components in USA are extremly expensive for Asian people. May be $50 is not mor for Americans but here a normal man can earn Rs.5,000 within a month which is equal to $50!I don't know how to help you. No budget, hard to get parts, long distance,................
I know your situation. When I was a child in Canada, parts were one month away. My budget was small.
Now I need a good limiter circuit made by few opamps and 2180 without 2252 but good performance.I don't know how to help you.
I don't know which limiter circuit you are talking about. The PiRa, Harry's and my Mod4 circuits use a parallel capacitor and resistor.If I made any limiter, simply can't I add 51k+100nf in series for Asian pre-emphasis (around 50uS)?
I am talking any limiter made by 2180 chip without its another chip 2252. (didn't get exact circuit till now)I don't know which limiter circuit you are talking about. The PiRa, Harry's and my Mod4 circuits use a parallel capacitor and resistor.
51k and 100nF make 5100us, not 50us. For 50us then you need 50k and 1nF. It must be fed from a low impedance source and feed a low impedance.
You need an average level or a peak level detector circuit, preferably with full-wave rectification. The datasheet for the LM3915 has some full-wave peak detector circuits.I am talking any limiter made by 2180 chip without its another chip 2252. (didn't get exact circuit till now)
That is not pre-emphasis. Pre-emphasis boosts high frequencies above 50us which is 3200Hz. So 3.2kHz is boosted +3dB, 6.4kHz is boosted +6dB and 12.8kHz is boosted +12dB. Your series RC does not boost high frequencies like that. Instead it cuts low frequencies so the highs have a flat frequency response and 3.2kHz is at -3dB, 1.6kHz is at -6dB, 800Hz is at -12dB, 400Hz is at -18dB, 200Hz is at -24dB, 100Hz is at -30dB etc. (no bass).(Pre-emphasis) Oops yes, I made mistake, I was trying to say 51k+1nF in series before limiter.
I downloaded it and WINRAR unzipped it. Then I downloaded Java Runtime Environment but I cannot open the limiter/compression software.Audioguru, have to tried the limiter/compressure tiny software? Is it working you found?
That's what I need. A audio processor that will censor what I am saying.I worked with high quality digital telephone conferencing products.
the circuit can even censor out profanity or certain phrases from being heard.
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