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Differences in DSP?

Posted: Fri Jan 23, 2004 4:56 am
by Josh
I've noticed that my XTS2.5K handles errors differently than my XTS3000. I am not sure whether it's good or bad, but is way different,, and I'm sure it holds true on the XTS5K as well.

When receiving a weak signal, the XTS3K simply mutes the speaker when the error rate gets too high, the "selectieve muting" and unmuting when decodable data is received sometimes allows the end-user to make sense of what's being said. I like it. (DSPN 07.19)

On the other hand, my 2500 (DSP2.??) gets stuck on the last sound byte that it decoded until A) It gets more decodable data, or B) mutes the speaker after about 1/8 second. What you get as a result is "goat-boy" style baaaaa- ing noises. I think it's annoying and a put-down to IMBE digital error correction...it's almost as bad as the audio "soup" a Nextel puts out, but, of course, not as bad and not as long.

Is this the DSP doing this? Has anyone else noticed this sort of audio differential?

-Josh

Posted: Wed Jan 28, 2004 3:10 am
by ExKa|iBuR
In the RSS, under the F4/F3/F2/F4 menu, there's a setting called Weak Signal Fringe. According to Help, it says:

The digital audio indicators will be used to provide the user with feedback
about the quality of the received audio. These indicators are used in order
to distinguish between signal degradation caused by strong signal
interference and degradation caused by a weak signal fringe condition.

Inbound indicators are used to reveal the condition of the signal TO THE
BASE STATION. The user will hear a buzz from the speaker if there is a
strong signal interference problem, and noise under a fringe condition.

Outbound indicators are used to reveal the condition of the signal TO THE
SUBSCRIBER. The user will hear a buzz from the speaker during a strong signal intererence problem and noise under a weak signal fringe condition.
The inbound buzz and noise are different from the outbound buzz and noise.

The factory default for Strong Interference and Weak Signal Fringe is
Disabled.




Anyone know what this means? Hearing a noise and a buzz? heh.

-Mike