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https://en.wikipedia.org/wiki/List_of_smartphones_with_HD_Voice_support
This is a list of smartphones that support wideband audio, better known as HD Voice and VoLTE.Wideband speech coding standards include MDCT-based audio coding formats such as Siren and AAC-LD, and ACELP-based formats such as Adaptive Multi-Rate Wideband (AMR-WB).
https://en.wikipedia.org/wiki/Adaptive_Multi-Rate_Wideband
Adaptive Multi-Rate Wideband (AMR-WB) is a patented wideband speech audio coding standard developed based on Adaptive Multi-Rate encoding, using similar methodology as algebraic code excited linear prediction (ACELP). AMR-WB provides improved speech quality due to a wider speech bandwidth of 50–7000 Hz compared to narrowband speech coders which in general are optimized for POTS …Standard: ITU-T G.722.2
https://www.anandtech.com/show/6594/tmobile-announces-amrwb-hd-voice-calls-active-on-its-network
Jan 09, 2013 · T-Mobile Announces AMR-WB (HD Voice) Calls Active on its Network ... an iPhone 5 (attached to PCS WCDMA here in Las Vegas) and a Nexus 4, which also sounded very different than an AT&T AMR-NB ...Author: Brian Klug
https://cpratt.livejournal.com/714320.html
OK, I give up. It looks like iPhone has supported AMR narrowband since its release. My question is this: does the new iPhone 3G support AMR-WB? Or does it just support "regular" AMR? I am confused.
https://www.forbes.com/sites/eliseackerman/2012/09/14/why-iphone-5s-support-for-hd-voice-will-mean-nothing-to-u-s-users/
Sep 14, 2012 · News that the iPhone 5 will support HD voice has been celebrated by cell phone users who assume, quite logically, that it means they'll get better …Author: Elise Ackerman
https://stackoverflow.com/questions/276644/how-can-i-record-amr-audio-format-on-the-iphone
How can I record AMR audio format on the iPhone? Ask Question Asked 11 years ago. ... Compressed AMR would do fine. The iPhone framework built for recording audio is simple enough, but the only examples I've found for setting up the audio format (which come from Apple) use LinearPCM. I've tried various other combinations of values, but can't ...
https://readwrite.com/2014/06/02/apple-ends-iphone-4-support-with-ios-8-wwdc/
The iPhone 4, which more or less ... dropping support for these earlier models is a clever way for Apple to get hardware laggards to upgrade their devices in the otherwise-slow summer months ...
https://apps.apple.com/us/app/isoftphone-voip-sip-phone/id586192986
Jan 27, 2013 · iSoftPhone for iPhone and iPod Touch is a SIP-based phone specifically designed for the Apple mobile devices that uses a Wi-Fi or 3G/4G connection to make and receive calls, in conjunction with a VoIP provider or your private PBX. iSoftPhone has been designed with easy to …1/5(1)
https://9to5mac.com/2013/06/27/hacked-att-carrier-update-claims-to-enable-hd-voice-wideband-audio-on-iphone-ahead-of-official-rollout-a/
Jun 27, 2013 · If you are in an area that does not support HD Voice (AMR-WB) then your iPhone will auto default back to the standard CS AMR 5 codec which is …
https://www.macrumors.com/2014/06/02/iphone-4-discontinued-ios8/
Jun 02, 2014 · Apple to Discontinue Support for iPhone 4 in iOS 8 Monday June 2, 2014 1:31 PM PDT by Richard Padilla. Near the end of today's keynote at the Worldwide Developers Conference that included a …
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