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  1. #1
    Super Contributor
    Join Date
    Mar 2004
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    Czech Republic
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    2,037

    Bandwidth for audio stream for the mobile client

    Hello,

    1/ I would like to know if I am computing (with rough precision) the bandwidth for MP3/AAC audio stream correctly. Parameters of the stream are:

    Code:
        Sample rate: 44100,  
        Bitrate: 128bit
        Channels: 2,
        Stream type: icecast (no metadata)
        Codecs used: MP3 or AAC
    The raw audio would be: 44100*128*2 = 11289600 bits/sec = 11025 kbit/sec = ~10.8 MBit/sec. I will count with 10:1 compression ratio (which I think can be more or less correct - but please correct me, if I am wrong) then approx. 1 Megabit/sec should be enough.

    2/ Is the computation correct? Because this means that for GPRS (~80 kbps), EDGE (~230kbps), UMTS (~384kbps) it does not make sense to even try those streams. If my computation is correct, then the only technology would be then the HDSPA, which starts on ~1.8 Mbps.

    3/ Can someone give me good parameters for the streaming for the mobile audio streaming?

    Thanks a lot
    BR
    STeN

  2. #2
    Nokia Developer Moderator
    Join Date
    Feb 2006
    Location
    Oslo, Norway
    Posts
    28,675

    Re: Bandwidth for audio stream for the mobile client

    The computation is unlikely correct. Remember that the topic is audio compression and not audio bloating.
    Uncompressed CD quality audio has 44100 Hz sample rate, 16 bits per sample, 2 channels, so CD has 44100*16*2 ~ 1.4 Mbit/s.

    That 128 is already the value which you are trying to calculate: it means that the given stream is compressed to 128 kbit/s.

  3. #3
    Super Contributor
    Join Date
    Mar 2004
    Location
    Czech Republic
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    2,037

    Re: Bandwidth for audio stream for the mobile client

    Hi,

    Many thanks for a help!! I was still thinking 128 bits is per sample... This is pretty embarrassing.

    Really thanks for helping me with part of a head ache problem I am solving in past days)

    Kind Regards,
    STeN

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