EVS SWB (HD+) codec

[whiskerp]

I've just been testing calls between two EE network SIMs. If I put both in Samsung Galaxy (S23/S20) phones the call gets the super-wideband version of EVS (EVS-SWB) and noticeably amazing 16kHz audio quality. If I move one of the SIMs into an iPhone Xr it only connects as EVS-WB, which is half the audio bandwidth and the difference is very noticeable. 

Is the iPhone Xr really that crippled and not able to handle EVS-SWB?

[FIZZYLP]

Hello @whiskerp 

The sims shouldn’t make a difference to EVS-SWB as this is an audio stand, as long as your sim is 4G or 5G enabled then it’s not applicable.

I can’t find anything official regarding Apple’s iPhone regarding EVS-SWB capabilities but doesn’t mean the latest models can’t handle it.

But definitely an interesting experience 🙂

[whiskerp]

When I tried the same on Vodafone it connected as AMR-WB when using the iPhone (EVS-SWB if both Samsungs), so I guess they have configured support for SWB or bust. It's obviously this iPhone model which is incapable of EVS-SWB.

[bristolian]

The audio codec is negotiated as part of call setup - network & device capabilities both factor.

EVS codec is often displayed as "HD+", WB-AMR is commonly known as "HD"

[whiskerp]

EVS-WB shows on the *#0011# after setting up a call with the iPhone and HD is displayed. EVS-SWB shows up as HD+ when setting up a call between two Galaxy phones.