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Uber Geek


# 99740 26-Mar-2012 16:28
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Why does VF's hold music sound like a slighty-out-of-tune FM radio, complete with frequent bursts of static?
 
That said, Telecom seems to have the same issue - is it deliberate?




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Ultimate Geek


  # 600419 26-Mar-2012 18:14
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Anybody been able to replicate this? The hold music I have heard today is fine and I have not heard anybody else mention this.




Please note: I have a professional bias towards Vodafone.

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  # 600566 27-Mar-2012 09:18
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Are you calling from mobile or landline? Mobile codecs (AMR, etc) don't generally cope to well with music.




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  # 600607 27-Mar-2012 10:52
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Aren't landlines also limited to a certain frequency range, so any notes outside that range will be cut out, making most hold music sound like crap anyway?

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  # 600624 27-Mar-2012 11:22
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sidefx: Aren't landlines also limited to a certain frequency range, so any notes outside that range will be cut out, making most hold music sound like crap anyway?


Yes G.711 only had 8kHz sampling, which is very low compared to modern music.

Wideband VoIP codecs such as G.722 support 16kHz delivers greater bandwidth and clarity.

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  # 602947 31-Mar-2012 16:11
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Personally when i have been on hold for any time longer than 5 minutes, i consider static to be better than dead silence - which telstra clear has alot of between songs. They use classical music that is too quiet at the beginning and end and doesnt trigger the silence suppression until later in the song.




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  # 603156 1-Apr-2012 07:52
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sbiddle:

Yes G.711 only had 8kHz sampling, which is very low compared to modern music.

Wideband VoIP codecs such as G.722 support 16kHz delivers greater bandwidth and clarity.


..and just to elaborate further 8khz sampling, is a dyanmic range of 4khz from an audio perspective... Which is a fairly limited chunk of our human ear's 20Hz - 20khz range... 

PSTN implementation further limit this dynamic range to someting in the order of 250hz to 3.3khz. DSL starts from around there up...
 




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  # 603253 1-Apr-2012 12:09
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Places just have the music too quiet so you get it replaced with comfort noise all the time.

Worse is places that just have an actual radio for hold music, so you get to hear the dross on the airwaves when waiting for a person.




Richard rich.ms

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