Re: 12 KBs? Tmobile uses full rate AMR, which is very good.
AT&T on the other hand uses 5.5 kbit/s AMR, which is the worst of any carrier.
Re: HD or HF
said by flyingjoey:they will slap on hd on anything they can lol they have hd radio wh not hd voice.
I always thought that HD was a term used for something you view, and High Fidelity was for sound. am I wrong here?
| |fuziwuziNot born yesterdayPremium
Re: T-Mobile to sell Apple products in 2013
said by michieru:Probably nothing upfront since in the same timeframe T-Mobile will no longer subsidize phones. So, you want an iPhone on T-Mobile, you pay full price for it.
I wonder how much T-mobile paid to have the iPhone or if they reached an agreement that allowed for a partnership for value plans to pay for iPhones.
Teabaggers: Destroying America is Priority #1
Re: So why is this better for battery life? Good question! It uses the existing circuit-switched UMTS radio interface to deliver the voice call, rather than IP-based transport.
In a typical UMTS network, the voice codec in use is based on the Adaptive Multirate (AMR) framework, which allows the base station and handset to negotiate a bitrate based on cell congestion, and encodes your voice digitally. However, the widely used AMR codec, while having a full bitrate of 12.2 kbps, only encodes sounds within the 300-3400Hz range. This new codec has a typical bitrate of 12.65kbps and encodes 50-7000Hz, so it much more closely approximates the human voice.
AMR-WB is the codec that operators are using in VoLTE deployments as well, but that transport method is much more expensive from a battery life standpoint due to increased network overhead and signalling when compared with the highly power-efficient circuit-switched UMTS air interface. (see »en.wikipedia.org/wiki/Ad ··· Wideband for more)