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Sound quality comparison

Discussion in 'GENERAL Wireless Discussion' started by Gonz, Apr 26, 2007.

  1. Gonz

    Gonz Senior Member
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    Check this out:

    I did a bit of an experiment. I did voice quality samples of all the different network technologies available to me here at school. These included AMPS 800, TDMA 800, CDMA 800, and GSM 1900. I was unfortunately unable to test IDEN.

    Links:
    AMPS.wav
    CDMA1X.wav
    CDMAIS95.wav
    GSM.wav
    TDMA.wav
     
    #1 Gonz, Apr 26, 2007
    Last edited: Apr 26, 2007
  2. TWX

    TWX Mobile Enthusiast
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    This is a really cool, for the first time I could compare the different technologies side-by-side! GSM sounds the best (except for the buzzing), TDMA is by far the worst. Great work Gonz!!
     
  3. Gonz

    Gonz Senior Member
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    Thanks, the TDMA is on a Nokia 6340i Cingular Gait, CDMA and AMPS are on a VZW Nokia 6256i, and GSM on a Nokia 6010. I couldnt quite tell if the 6340 jumped into analog or not. I'll have to try again.
     
  4. Gonz

    Gonz Senior Member
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    One More:

    Land Line.wav


    For the most recent, the 6340 is for sure in TDMA. Note: I was able to get a USCC switch message on a landline and GSM phone (for those of you who are sharp) by dialing a roamer access number. They have had their switch messages with that guy's voice as long as I can remember.
     
  5. strunke

    strunke .:|Always Covered|:.
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    The only real difference between the GSM and CDMA1x is volume/bass. The GSM has more volume, that buzz is annoying though. TDMA was worst.

    The amps around here sounds a lot worse then that, haha.
     
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  6. bobolito

    bobolito Diamond Senior Member
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    That's the same message you used to get on AT&T Wireless. They just changed the name.

    I don't mean to burst bubbles, but with GSM, there are several codecs the phone can use (EFR, AMR-FS, AMR-HR), so for the sake of comparison those should be stated as well because they sound different.
     
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  7. Ellen

    Ellen Guest

    When you say that this buzz is annoying, are you hearing it with CDMA or the GSM phones? I use both CDMA and GSM and although I don't hear any buzzing noise sometimes I do get static on my GSM line when I'm in an area that has poor reception.
     
  8. strunke

    strunke .:|Always Covered|:.
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    I was just talking about the interference buzz on GSM, it's almost like a metronome clicking......
     
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  9. strunke

    strunke .:|Always Covered|:.
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    Forgot about the codecs....CDMA also has two different ones. More common EVRC and 13k......

    sorry for the extra post, thought I hit edit :)
     
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  10. Fire14

    Fire14 Easy,Cheap & Sleazy
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    I think he's talking about the recordings that Gonz made & posted, it's the same sound of a GSM phone by a speaker.

    I haven't had the static sound on my phone, but sometimes you can hear a slight sound in the background, almost like it's put there to let you know your still connected.
    There have been a lot of times when I have been on a call it's so quiet I have to ask if the person is still there.

    To me when I use my CDMA phone, it sounds different & maybe it's like strunke said it's a bass sound difference, since my Moto Buzz sounds like it has less bass vs my Moto V635 GSM phone. (Or it's a phone quality issue)
     
  11. Gonz

    Gonz Senior Member
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    The CDMA 1x was a 13k codec, and the GSM was in Full Rate.
     
  12. RadioRaiders

    RadioRaiders RF Black-Belt
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    To take a sample in one place with one phone can give false results. You need to take many samples from various areas of the network.

    Operators have sepcial tools that read PESQ values, MOS scores. These kind of tests take a voice sample transmitted over the network and compare it against the original to see how much it degraded.
     
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  13. RadioRaiders

    RadioRaiders RF Black-Belt
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    GSM can have a background noize inserted. With discontinuous transmission (ie: if you aren't talking, the phone stops transmitting) the person talking at the other end would hear nothing (the phone would appear dead) and wonder if they lost the connection (ie: "Hello? Are you still there?") But with the background noize, they still hear a little something so they know they haven't lost the connection. I'm not sure if a GSM standard feature, or if operators can select to use it or not.
     
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  14. Telekom

    Telekom Bronze Senior Member
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    Unless you use the same phone on all networks at the same distance from a base station you're not going to have a fair and meaningful comparison.
     
  15. bobolito

    bobolito Diamond Senior Member
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    The only way you can do that is by using a CDMA/GSM phone. Sprint and Verizon have a phone like that, but they are not capable of the US frequencies in GSM mode. Therefore, I don't think it is possible to do this with just one phone.
     
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  16. Telekom

    Telekom Bronze Senior Member
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    Not really necessary for that. Many manufacturers (Moto for one) have the same model in both GSM and CDMA (V3/Razr as an example.) Whether the CDMA Razr behaves RF-wise like the GSM version or vice-versa is up to someone else's test. Unless you had the nearest base station/tower the same distance from your phone you could not have a fair test either.
     
  17. Gonz

    Gonz Senior Member
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    Ok ok. I realized that They were with different phones, etc. But isnt it better to have an experiment than not? I'm not gonna be able to compare all those with one phone, but I did use comparable ones, at least all from the same manufacturer. Plus, signal is just about maxed on all those carriers in the location where I made the test calls. The carriers are all on the same tower.
     
  18. TWX

    TWX Mobile Enthusiast
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    I think it was a good experiment, it was the first time I could really compare the different standards side-by-side like I said before, so it was cool to me. :D
     
  19. RadioFoneGuy

    RadioFoneGuy Powered by HTC FUZE
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    Dont base GSM on that sample. That sounded like it was held next to a computer screen, in which the power supply would provide the interference.

    If you had a CDMA, GSM and Land line phone and you had three ears the difference in call quality is very minimal. This is of course assuming you had comparable phones with good signal and the land line was in good working order.
     
  20. Fire14

    Fire14 Easy,Cheap & Sleazy
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    Yes it was good that you did this experiment, and with all experiments you will get feedback on what could be done to test the theory differently, so don't take what has been posted as negative, just other options on how it could be done differently to expand on the experiment.
     
  21. RadioFoneGuy

    RadioFoneGuy Powered by HTC FUZE
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    yah it was a cool test, it would be nice to record these again with something that wont make interference on the TDMA and GSM
     
  22. Telekom

    Telekom Bronze Senior Member
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    GSM (and TDMA IS-136) tends to make interference on items that are not well shielded. With GSM you hear a buzzy bid-it-did-it-bid-it-bid-it sound especially when a call is about to come in or a call is originated. You will also hear this sound occasionally when a call isn't either originated or received my guess is that periodically the handset checks the system to see if there's something it should know about. With TDMA you hear a more pronounced low frequency hum if your handset is too close to a speaker you'll hear this interference as well as close to another not well shielded phone as well.
     
  23. rytard

    rytard Junior Member
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    I believe Verizon Wireless' AMPS/CDMA network has the greatest sound quality, i dissagree with the statements that GSM is the best. While talking at my fathers house on his Cingular GSM phone where my verizon dosent get signal i noticed very poor audio quality even though he has full signal! everywhere i go and use his phone it is poor quality...every few seconds there is a small cut in the audio although less that 2 seconds it is very noticible and annoying. While talking on my phone even when the signal is low the audio quality is still solid without gaps like his!



    ___________________________________________________________________
    Verizon Rules Forever-Best coverage in the cell phone world! If you dont believe me check the maps! all the other companies lie about having the best coverage, not Verizon
     
  24. Telekom

    Telekom Bronze Senior Member
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    Sound quality is always subjective. What you think is great someone else may not. What you judge may be colored too by which handset you use. Handsets vary greatly and some may color the sound differently to something that one person or another prefers. Your "proof" is hardly scientific since it is just based on your own personal bias.

    And it's patently obvious who you like for service since you added that cute three line love-fest at the end of your bias. I know you may find this hard to believe but there are areas where Verizon's coverage does not trump everyone else's. To make an absolute statement that this or that is the best is grandstanding at the very least.
     
  25. RadioRaiders

    RadioRaiders RF Black-Belt
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    To say CDMA has better sound quality than GSM is rubbish. They are both more or less the same. And the problem you describe can be anything from a faulty phone, to a poorly planned network. Both of which can happen in CDMA or GSM networks.

    Oh, and the beep-beep-beep in GSM you hear is signaling. Usually when a text message is incoming or when you phone hands-over to another cell (which can happen without you moving, by the way, if the network decides to force you to camp on a differnt cell for capacity reasons)
     
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  26. Fire14

    Fire14 Easy,Cheap & Sleazy
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    I agree with your statement on the phone and how it's subjective with different factors involved.

    As for your statement on his signature, now think about this for a second.

    He has "No Service with his Verizon phone" so he use's his fathers Cingular phone to make calls.

    (Not trying to offend any Verizon people here, it's just this posters statement & signature that made me laugh.)
     
  27. hf1khal

    hf1khal Who am I to judge
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    Nice catch, I can not believe that I missed that.;)
     
  28. TWX

    TWX Mobile Enthusiast
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    Lol, I got a laugh outt'a this guys post and signature as well, first he points out that his VZW wireless phone didn't have serivce, then in his sig. he say's how Verizon's coverage is the best in the world. No carrier has the best coverage, it is simply impossible. Anyways his statement was very contradicting.
     
  29. hf1khal

    hf1khal Who am I to judge
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    I am glad Telekom got the whole thing quoted as it sure will be there in case if there is an edit.
     
  30. Fire14

    Fire14 Easy,Cheap & Sleazy
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    I agree, if a carrier had full coverage everywhere you went here in the US, it would be awsome & they would have the most customers, and there would never be this type of statement needed. (now maybe in so many hears in the future it will be a different story, but till that time comes no carrier is 100%)

    Good point, I am sure the poster will look at this & think about an edit.
     

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