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Reply # 26155 11-Jan-2006 16:47
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Almost correct but not totally. Without elaborating to much EVRC is where you will spend most of your time therefore any benefit you think you may gain is likely to be perceived rather than actual.

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  Reply # 26196 12-Jan-2006 00:04
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NZ currently does not force EVRC but may do in the future

A bit more testing with recent handsets has come to the conclusion that EVRC CAN work very well, The more recent handsets seem to have given away the whole "background noise suppression" resulting in a much cleaner sound without jitter or that forced comfort noise than sounds like rain on a clearlite roof.. I played with a nokia 6100 today and am very impressed, Large responsive keys, nice screen, SMS is one touch to the left instead of endless scrolling and voice (EVRC) is top notch.

There is still an improvement whn changing to QCELP when Speaking to someone on Vodafone, QCELP is similar to the older gneration GSM vocoder. all results vary though, Ericsson for example chop all audio off below 500KHz. Sanyo allow all audio spectrum through, seems to result in either great sound or it sounds like someone is talking down a cardboard tube while they are speaking.

Most older handsets will benefit from changing to QCELP, It seems the newer ones have the EVRC a bit more down pat so I see little need unless most calls are to the "other side" (remember how bad bellsouth sounded before EFR??)

Old Nokia's sounded terrible (6385, 5580 2280 etc) The latest two Nokias I tried (both Flips) are stunning in almost every way.

Sanyos' send all voice spectrum 50KHz- 3500KHz so can be fantastic or terrible. no change possible.

Hyundais really like the change to QCELP.

Samsung sound a lot better with the change but newer ones are not too bad on EVRC. older ones are horrid.

Ericsson, Never experimented but the little white thing with rubber sides actually sounded very nice. very very good for it's age...

Geek Geek Geek.

That all on this topic now.. good experiment... ;-P


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  Reply # 26253 12-Jan-2006 12:32
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A Pantech TX130C will sit and wait for the SPC Code for about 20 seconds, then return to the time display.

Various codes can be entered, and different menus appear for each one (I know of only two, and I cannot divulge them sorry)

The QCELP codec is the best this model has, and is apparently designed for voice and not music. Odd, considering this model appears to be set up like a ghetto blaster with speakers on each side!

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  Reply # 26317 12-Jan-2006 21:43
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Qcelp handles single tones and music (hold music) much better than EVRC ever will as EVRC is designed for low bitrate speech only. Both are designed as voice codecs from the ground so music will never sound "good"
AMR is the best choice for music, as it's kinda hybrid though I have a codec that can encode quite decent music up to 44KHz at just 14KBPS, it can also manage 12 or even 8 but starts to sound like a glockenspeil. I'll upload a demo of them all soon.

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  Reply # 26320 12-Jan-2006 21:48
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paradoxsm:....I'll upload a demo of them all soon.

I can provide hosting for those files if you'd like.

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