Feeds

3G chiefs choose AAC for mobile music delivery

High Efficiency codec recommended to network, content providers

  • alert
  • submit to reddit

Security for virtualized datacentres

3GPP, the organisation behind third-generation mobile phone network standards, has selected MPEG 4's High Efficiency AAC (HE-AAC) as its codec of choice for 3G-delivered audio content.

HE-AAC builds on AAC (Advanced Audio Codec) by adding a spectral band replication system from codec specialist Coding Technologies. This essentially reconstructs high frequency signals from hints incorporated in the encoded file. That allows the high frequencies to be removed from the file, which encodes only the lower frequencies using regular AAC.

The upshot is an increase in the codec's efficiency by a factor of two - essentially you can encode music at half the bitrate of a regular AAC without a loss of audio quality.

Coding claims HE-AAC delivers CD-quality stereo at 48Kbps - much less than the sub-CD 128Kbps AAC Apple uses for its iTunes Music Store, for example. Smaller files mean quicker downloads, and more songs can be squeezed into the target handset's memory.

3GPP's interest in the codec arises from the need to define a standard mechanism for streaming and downloading quality audio to 3G handsets. The organisation's blessing doesn't mandate HE-AAC's usage, but it's nonetheless a weighty recommendation for the format.

In the UK, network operators Vodafone and O2 use HE-AAC as the basis for their music download services. AOL uses it too. Unlike the MP3 format, AAC was designed with DRM in mind, and for the format incorporates space within each file for DRM data.

The technology behind the HE-AAC codec was incorporated into the MPEG 4 patent pool in July 2004, having already been selected by the DVD Forum as the mandated format for audio files stored in future DVD Audio discs' 'ROM zone' partitions. ®

Related stories

Dolby adds High-Efficiency AAC to MPEG 4 patent pool
Forum approves Apple music format for DVD Audio
DVD Forum denies 'AAC for DVD Audio' approval
DVD Forum chooses Apple music format for DVD Audio
MS, Apple pitch music at mobile phone makers
Nokia moves to counter Apple-Moto music alliance
Apple's Jobs 'offered iTunes team-up deal to Sony'
Real Networks 'seeks alliance' with Apple
Macrovision CDS-300 version 7 beta
Macrovision: iPod support for lock-in CDs in Q4

Protecting against web application threats using SSL

More from The Register

next story
Brit telcos warn Scots that voting Yes could lead to HEFTY bills
BT and Co: Independence vote likely to mean 'increased costs'
Phones 4u slips into administration after EE cuts ties with Brit mobe retailer
More than 5,500 jobs could be axed if rescue mission fails
New 'Cosmos' browser surfs the net by TXT alone
No data plan? No WiFi? No worries ... except sluggish download speed
Radio hams can encrypt, in emergencies, says Ofcom
Consultation promises new spectrum and hints at relaxed licence conditions
Blockbuster book lays out the first 20 years of the Smartphone Wars
Symbian's David Wood bares all. Not for the faint hearted
Bonking with Apple has POUNDED mobe operators' wallets
... into submission. Weve squeals, ditches payment plans
This flashlight app requires: Your contacts list, identity, access to your camera...
Who us, dodgy? Vast majority of mobile apps fail privacy test
prev story

Whitepapers

Providing a secure and efficient Helpdesk
A single remote control platform for user support is be key to providing an efficient helpdesk. Retain full control over the way in which screen and keystroke data is transmitted.
WIN a very cool portable ZX Spectrum
Win a one-off portable Spectrum built by legendary hardware hacker Ben Heck
Saudi Petroleum chooses Tegile storage solution
A storage solution that addresses company growth and performance for business-critical applications of caseware archive and search along with other key operational systems.
Protecting users from Firesheep and other Sidejacking attacks with SSL
Discussing the vulnerabilities inherent in Wi-Fi networks, and how using TLS/SSL for your entire site will assure security.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.