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On Jul 10, 12:28 pm, Frank Gilliland
wrote: This 85% is by no means the average modulation... which is really around 40% with voice signals. It varies as much as people have different voices and speaking styles, but it is generally accepted to be in the 20 to 25% range (peak to average ratio from 5:1 to 4:1). Since you have stopped your personal attack (for now), I will certainly respond to your comments. You are correct... I said "around 40%". You say 20-25%. Either way... the number is far from the optimum 100% value the VoiceMax can deliver. The VoiceMax brings the average modulation to 100%! That means that every voice... high or low... soft or loud... will modulate the radio at a constant 100%. Impossible, and you prove it yourself with your implementation of a noise gate. You can push 40 to 50% with heavy filtering, and that's about the best you can do, but it still causes moderate distortion. Very possible... and the distortion is less than 1% THD. Even if your "constant 100%" modulation applies only to unmuted voice, it would be completely unintelligible. You can pick up almost any book on radio communications and it will say the same thing. You are correct that the 100% average applies to the unmuted signal... Why would we be talking about anything else? The audio signal is perfectly clear and has less than 1% THD. www.telstar-electronics.com |
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