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  1.    #1  
    I currently use GSM and hate it when I'm talking and can not hear anything on the other end (is the other person laughing, whispering, yawning, while I'm talking or are they still even there).
    Someone told me that this was not the case with CDMA, and that they simply reduce the volume on the other end of the line. I'd be very thankfull if someone could please educate me about this.
  2. #2  
    I have no idea what you mean
  3.    #3  
    On a landline phone both people can be talking at once and both would be able to hear each other simultaneously. On my gsm phone I can't hear what the other person is doing if I'm talking. I was wondering what CDMA was like.
  4. webdave's Avatar
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    #4  
    Quote Originally Posted by oki32
    On a landline phone both people can be talking at once and both would be able to hear each other simultaneously. On my gsm phone I can't hear what the other person is doing if I'm talking. I was wondering what CDMA was like.
    That's not normal
  5. #5  
    My girlfriend has Cingular (an LG phone) and she gets this problem all the time when talking to me. If I'm not talking, it's dead silent on my end (to her). She is always like "you still there? hello?"

    I think it's a GSM thing....
  6. #6  
    Is that true? Sprint is most definitely NOT like that. I don't think I'd tolerate that. I mean, are these things phones or walkie-talkies?
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  7. #7  
    You aren't using the speakerphone when this happens are you? I have sprint and this will happen sometimes if I have the speakerphone on. If you aren't using the speakerphone, I would take it into your local sprint store to have them check it out.
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  8. #8  
    i have never experienced anything like this ever and i have been using GSM for years and years
    Nokia 3210 > Nokia 3310 >Palm Vx > Palm M105 >Treo 180g and Nokia 8850 > Treo 270 > Treo 600 > Sony TH55 > Tapwave Zodiac 2 > Treo 650 GSM > Imate KJam > Treo 750v

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  9. alee's Avatar
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    #9  
    It's not network related -- it's the handset. Some handsets have much stronger noise cancellation which may result in the effect you hear where idle is practically silent. I've seen it happen on LG phones -- both my CDMA LG VX6000s do it. My Motorolas on GSM and CDMA do not. My HS810 headset on GSM does it.
  10.    #10  
    I guess I'm really asking if its worth switching to sprint. I live in central michigan where I've had decent GSM coverage. The only thing that really bugs me is not being able to hear the other end of the line when I speaking.
  11.    #11  
    I know both types of phone do this to save energy, but I know it's done differently, and for gsm all noise seems to be blocked out. Does anyone have experience with a cdma treo?
  12. #12  
    This does not happen normally on gsm or cdma phones. your phone must be jacked up.

    to answer your question...it does not occur on the six treo 650's I have used.
  13. #13  
    It's Simplex vs. Duplex
  14. #14  
    Why not just assume the person on the other end is being polite and being silent if you're speaking? I don't quite understand the issue.


    Quote Originally Posted by oki32
    I guess I'm really asking if its worth switching to sprint. I live in central michigan where I've had decent GSM coverage. The only thing that really bugs me is not being able to hear the other end of the line when I speaking.
  15. #15  
    Quote Originally Posted by dutchtrumpet
    This does not happen normally on gsm or cdma phones. your phone must be jacked up.

    to answer your question...it does not occur on the six treo 650's I have used.
    Dutch,

    Have you really been thru 6 of these things already? What gives?
  16.    #16  
    For some people it may not be an issue. However, I'm in sales and it's important for me to pick up subtle sighs yawns ect. while I'm working. If sprint/cdma doesnt block out the other end of the conversation, it would be worth it for me to switch. Also my phone is not jacked up or modified in any way. If there were a way to tweak the phone so it wouldn't do this I would.
  17. #17  
    Quote Originally Posted by dragonslayer76
    It's Simplex vs. Duplex
    Not really, if the other end starts speaking they are heard again. its just a way of saving bandwith/energy.
    Same goes for international phonecalls over the sattelite..
    It is a bit strange at first but you get used to it..
    <IMG WIDTH="200" HEIGHT="50" SRC=http://www.visorcentral.com/images/visorcentral.gif> (ex)VisorCentral Discussion Moderator
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  18. #18  
    So are you saying GSM is not full duplex by design???
    Treo 650 GSM Unlocked-TMobile
  19. #19  
    Quote Originally Posted by paris
    So are you saying GSM is not full duplex by design???
    No it is full duplex, but if there is not signal from one side it doesnt transmit anything till there is a signal..
    <IMG WIDTH="200" HEIGHT="50" SRC=http://www.visorcentral.com/images/visorcentral.gif> (ex)VisorCentral Discussion Moderator
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  20. #20  
    CDMA doesn't simply reduce the volume when you aren't talking, it basically dynamically changes how much spectrum you are using based on the incoming volume/voice data. I.e. when you are listening in GSM/TDMA you are using full spectrum, i.e. transmitting at 100%, and in CDMA you are using anywhere from 1/2 to 1/8th of the spectrum. That's why CDMA is more efficient in allocating the spectrum than GSM/TDMA, in general.
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