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A free software equalizer for listening to Mix Radio International (and more!)

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ChrisSmolinski:
Mix Radio International transmits wide audio, around 15 kHz or so. But I have found that there is a lot of annoying hiss when setting my receive bandwidth that wide, since there is typically little audio content up there. I ran across this site which shows how to use AU Lab (a free tool for Mac users) as an audio equalizer. It works great for this application, now I have the bandwidth open wide, and have reduced the response on the high end somewhat. I can still hear it, but without the hiss.  Not sure if Mix Radio is using standard RIAA emphasis or not.

https://coderwall.com/p/dn0v-g/create-an-equalizer-for-all-audio-in-mac-os-x

redhat:
Would it be possible to add NRSC de-emphasis to any of the popular SDR applications?  In the event I get recordings with the bandwidth out to 12.5k (our current transmission bandwidth) I often have to process the recording to cut the highs down and restore flat response.  I believe Mix and Relay Station do similar, plus every AM station in the country.

My WinRadio has a adjustable de-emphasis feature, and I use it religiously when monitoring other stations.

+-RH

ChrisSmolinski:
Sure, if you can convince the author to do so  ;D

Actually the KiwiSDR software just got such a feature, you can select either 50 or 75 microsecond de-emphasis. I can notice a (good) difference with my KiwiSDR. I only have a 6 kHz maximum bandwidth with my Kiwi, since I have it set for four full featured SDRs, each with a waterfall. There is an option for 20 kHz audio (which is really just +/- 10 kHz), but you lose one of the receivers and only have three total in that case. Personally, I am not sure there are enough wide bandwidth worthy stations to make it a worthwhile compromise. Unless XFM/Mix/Relay Station go 24/7.  8)

redhat:
Don't forget Radio Illuminati.  He runs 10 KHz as well.

+-RH

ChrisSmolinski:

--- Quote from: redhat on April 25, 2019, 0539 UTC ---Don't forget Radio Illuminati.  He runs 10 KHz as well.

+-RH

--- End quote ---

Good point!  Mix was on last night, and I am listening to the SDR recording now, using the equalizer. I am not sure I have the equalizer set to any official standard, I just set it to what "sounds good".

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