Quick Note: AT&T Will Get HD Voice Service Later This Year
April 2, 2013 9:56 AM
comment(s) - last by
AT&T also plans to embrace over-the-top services
About a week ago,
that it would finally be brining the iPhone 5 to its wireless network. The company also made plans to bring HD Voice service to its LTE network.
Not to be outdone, AT&T has now announced that it will also add HD Voice service later this year. HD Voice provides users with higher quality (High Definition) audio, and requires support from the calling network and the devices making the call. That means that the network, your device, and the device of the person you're calling all have to support HD Voice capability.
AT&T senior VP Kris Rinne said, "HD Voice is part of our voice over LTE strategy."
Rinne also said that AT&T would be working on
LTE Advanced service
as well. LTE Advanced is designed to reduce interference and bond traffic from multiple frequencies together.
This article is over a month old, voting and posting comments is disabled
RE: HD Voice is What?
4/2/2013 3:53:49 PM
Thank you for that - I knew the frequency response was much more restrictive than other audio devices, but 300Hz on the low end seems awfully restrictive. I can't imagine too many people having voices that go above 3000Hz, but 300Hz would seem to cut off the bottom octave of James Earl Jones' voice.
Also, an 8000Hz sampling rate (minimum required for 4000Hz audio) seems awfully low when there are people who claim they can hear the difference between 44.1Khz (CD quality) and whatever SACD or DVD audio are.
RE: HD Voice is What?
4/3/2013 1:33:52 PM
Actually the current state of cell phone audio fidelity is quite poor.
For the Public Switched Telephone Network (PSTN), audio is filtered with a 300 Hz to 3.4 kHz bandwidth and sampled at 8 kHz and then encoded into an 8 bit logarithmic resolution to yield a 64 kbit/sec data stream.
This filtering excludes the fundamental frequency of most adult voices: "The voiced speech of a typical adult male will have a fundamental frequency from 85 to 180 Hz, and that of a typical adult female from 165 to 255 Hz. Thus, the fundamental frequency of most speech falls below the bottom of the "voice frequency" band as defined above. However, enough of the harmonic series will be present for the missing fundamental to create the impression of hearing the fundamental tone." (
Cell phones make things much worse by reducing the G.711 data rate approximately 4 times. They use lossy compression to yield more compressed formats: "GSM has used a variety of voice codecs to squeeze 3.1 kHz audio into between 6.5 and 13 kbit/s"
and CDMA compresses similarly allowing up to 14.4 Kbit/s,
I'm ready for HD cellphone voice quality and I hope it leads to some overdue emphasis on voice quality in the phones themselves.
"This is from the DailyTech.com. It's a science website." -- Rush Limbaugh
iPhone 5 to Hit T-Mobile April 12 for $99 Plus $20/Month Repayment Charge
March 26, 2013, 11:36 AM
AT&T to Unload LTE Advanced on the U.S. Masses in 2013
November 9, 2011, 10:46 AM
Verizon Wireless Offers Up $100* LG G3, Will Be Available July 17
July 10, 2014, 4:21 PM
Satya Nadella Says Microsoft is a "Productivity and Platform Company" for the Mobile/Cloud World
July 10, 2014, 12:29 PM
Motorola Touts Its Moto 360 Smartwatch in Another Teaser Video
July 10, 2014, 9:26 AM
Quick Note: Chromecast Update Allows You to Mirror Your Smartphone, Tablet to TV
July 9, 2014, 5:34 PM
Sony Xperia Z1 Compact Finally Available in the U.S. After 6 Month Delay
July 9, 2014, 1:08 PM
Quick Note: Sony Xperia Z2 LTE Tablet Comes Exclusively to Verizon Wireless
July 9, 2014, 12:25 PM
Most Popular Articles
Apple's iPhone, iPad Update iOS 7.1.2 is Badly Broken for Some
July 8, 2014, 2:00 PM
Despite Legal Threats Google Begins Posting Warnings of ISP Throttling
July 7, 2014, 5:52 PM
Google Steps up Moral Censorship, Hogties All Ads With Sexual Content
July 4, 2014, 2:00 PM
Your Uncharged Smartphone, Tablet May Prevent You from Boarding U.S.-bound Flights
July 6, 2014, 11:11 PM
Report: Apple Nabs Sales Director from Watch Maker TAG Heuer
July 4, 2014, 1:48 PM
Latest Blog Posts
Space Terrorism is a Looming Threat For the United States
Apr 23, 2014, 7:47 PM
Facebook Aims to Provide Internet to "Every Person in the World" with Drones, Satellites
Apr 1, 2014, 10:20 AM
Retail Mobile Sites Experience Outages in Light of Simplexity's Bankruptcy
Mar 14, 2014, 8:48 AM
Tesla vs. BMW: Who Has the Safer EV?
Feb 1, 2014, 2:56 PM
Justice Leaks Details of Next HTC One Two Flagship Phone
Dec 5, 2013, 4:04 PM
More Blog Posts
Copyright 2014 DailyTech LLC. -
Terms, Conditions & Privacy Information