skipp025 wrote: > > > The End-to-End audio path is flat through the repeater. There is > > no de-emphasis or pre-emphasis going on inside the repeater audio > > path. The repeater receiver leaves the audio alone, the controller > > leaves it alone, and the repeater transmitter leaves it alone. > > In reality that never happens 100%... the receiver, audio interface > circuit and the transmitter modulator always "color" the audio to > some degree.
But they don't do it intentionally as a pre/de-emph circuit does. If the interface is done right, it won't color it at all. > > That is flat audio through a repeater. > > Actually... it's better described as "transparent audio through a > repeater" Actually, 'flat response' is better. Since the de-emph/pre-emph changes the audio intentionally, the term 'processed audio' is more applicable to such a repeater. > > In practical real-world service, every users transmitter > > pre-emphasizes the audio on transmit, and every users radio > > de-emphasizes the audio on receive. The repeater should leave > > the through-put audio alone, and your repeater will sound just > > like simplex does. > > I hope not... most ham radios are over deviated. I depend on my > settings to clean/limit many of the users ctcss and voice deviations > up quite a bit. Simplex audio sounds dull and weak compared to a > well thought out repeater audio chain. If it sounds dull and weak, that is because the USER RADIOS made it that way. A properly set up repeater will not alter the audio at all. Any change you make to the audio will have a negative effect on half of the users. For example, if you boost the highs, you will make a bassy radio sound better, but a tinny radio will sound even more tinny and a properly set up radio will be made to sound tinny. Fix the problem at the source - don't try to make the repeater correct for problems in the user radios. > > No audio processing should be done inside the repeater, period. > > Another whole topic... but I like the sound of repeater audio with > a slight amount of voice audio processing/compression. Then add such processing to *your* receiver. Don't try to 'force' your tastes on everyone else. Someone else may think what you think sounds good sounds terrible. Joe M.
