Why was P25 phase I decoded with so many artifacts in the audio? this even goes for P25 radios of the 2000s. Was this the first attempt at digital voice decode? Why did it take so long to improve it?
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Old P25 decoding
- Thread starter Pr999
- Start date
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- Tags
- digital voice p25 scanners
...artifacts?
Yes. The audio sounds watery and compressed.
For the longest time my county ran a P25 Type 2 system, not phase 2 but type 2, which was before P25 Phase 1 and it sounded fine. Maybe your radio or area sounded bad but our area didn't. That said, P25 has been updated numerous times, so not what you missed, but it didn't take "so long" as you say.
P25 has types? I never knew that. Anyway, listening to the audio quality of Phase I decode between older scanners like the BCD996/396/XT/T and the GRECOM PSR-500/600, and newer scanners like the BCDX36HP, HP2, SDSs, BCD996/325P2, and the TRX-1 & 2 seem slightly different. The older scanners seemed to have a lot of digital artifacts in the audio which made it sound very computerized, while the newer ones sound more filtered.
Oh, I didn't realise you were talking about a Motorola trunking type.
Motorola Type II SmartZone and SmartZone Omnilink were capable of using the P25 Common Air Interface (CAI) audio on mixed-mode repeaters but ran on the 3600 baud control channel. The real early DSP's in the Astro and X series radios had a lot to be desired, especially with simulcast systems. Once the X series Astro25 radios got past firmware version 14 and then again in 17 it got a lot better on our SmartZone mixed-mode system.
wtp
Member
scanner =/= professional radio.
DVINTHEHOUSEMAN
Up North
Could be a multitude of things, e.g. faint signal, out of alignment, poor equipment, etc. The P25 spec only allows for a real audio bitrate of 4.4 kbps IIRC, with the rest of the available throughput (9600 bps total) being taken up by error correction and signaling. It is compressed and sounds much different than in-person or analog speech.
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