Re: bridging ASL, DMR and DSTAR


Ken KE2N
 

going the other way (DMR/C4FM-> Analog) could use help too.  It seems the vocoders are quite capable of making a lot of sound energy in the 3-4 kHz range.  It's what gives those digital modes a characteristic "sharp" sound.  Unfortunately, on the ASL side, things are affected by the 8 ks/sec rate.  Although it is theoretically possible to reproduce 3.99 kHz sound with this sampling rate, audio gets more and more distorted as you go above 3 kHz.  It would be a big improvement if the digital stream were filtered through a steep low pass filter - with a shoulder just above 3 kHz - before being passed to the analog side of things,

Ken
KE2N

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