[arm-allstar] dtmf audio level

[Larry Mollica]

Apologies, I was thinking only about audio reference levels and RX/TX modulation deviation, and not the user interface. My bad there.



On Aug 15, 2022, at 5:07 PM, David McGough kb4fxc-at-inttek.net |HamVOIP| <io2ju38rgqarkvt at sneakemail.com> wrote:

> 
> Larry,
> 
> Those instructions are ONLY for the usbradio driver, not simpleusb.  Most 
> HamVoIP users run simpleusb, which offers significantly improved audio 
> performance.
> 
> Note that the HamVoIP version of simpleusb is radically different from the 
> older, stock version.
> 
> 73, David K4FXC
> 
> 
> On Mon, 15 Aug 2022, "Larry Mollica via ARM-allstar" wrote:
> 
>> A couple of things…
>> 
>> Did you set RX and TX levels to spec per
>> https://wiki.allstarlink.org/wiki/Adjusting_USB_Radio_Audio_Levels  ??  I realize this can be tough for a lot of folks since it requires access to either a service monitor, or a modulation meter and FM signal generator, but it’s worth the effort. Unity gain is a good thing on networked systems. Ask around your local ham community, there’s probably somebody who knows someone with test gear willing to help. 
>> 
>> 
>> Getting de-emphasis wrong is a frequent cause of DTMF not working. Make sure that de-emphasis is being applied once, and not twice. If you are taking de-emphasized audio off the receiver, then your USB sound should be set to deemphasis=no. If not de-emphasized (i.e. raw discriminator) audio is used, then deemphasis=yes.
>> 
>> If double de-emphasized, RX audio will sound muddy, lacking highs.
>> If no de-emphasis in either radio or node, audio will sound tinny, no lows.
>> In either case, DTMF decoding suffers greatly.
>> 
>> Larry
>> AD6G
>> 
>> 
>> On Aug 15, 2022, at 12:24 PM, Don Sayler via ARM-allstar arm-allstar-at-hamvoip.org |HamVOIP| <7i5yut7hp95q5rt at sneakemail.com> wrote:
>> 
>>> Our node isn't recognizing dtmf tones. After doing a bit of experimenting,
>>> I have figured out that the audio level is too high and distorting the
>>> tones. But the voice audio level is fine. Is there a way to adjust the
>>> level of the dtmf tones individually? I didn't see one, and I'm not even
>>> sure how that would work. But I figured I'd ask the question...
>>> 
>>> Thanks.
>>> Don
>>> _______________________________________________
>>> 
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>>> 
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>> 
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>> 
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>> 
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>> 
>