AAC and WMA File Formats
AAC is a wideband audio coding algorithm that exploits two primary coding strategies to dramatically reduce the amount of data needed to represent high-quality digital audio. 1. Signal components that are perceptually irrelevant are discarded; 2. Redundancies in the coded audio signal are eliminated.
AAC offers sampling frequencies between 8 kHz and 96 kHz and any number of channels between 1 and 48. AAC encoders can switch dynamically between a single MDCT block of length 1024 points or 8 blocks of 128 points.
In April 2003, Apple Computer brought mainstream attention to AAC by announcing that its iTunes and iPod products would support songs in MPEG-4 AAC format (via a firmware update for older iPods). Customers could download music in a proprietary Digital Rights Management (DRM)-restricted form of AAC via the iTunes Store or create files without DRM from their own CDs using iTunes. In later years, Apple began offering music videos and movies, which also use AAC for audio encoding.
With regards to the DRM of WMA, the loss of the ability to restore licenses for WMA files in the Windows Media Player 11 was not positively received in an article from The Inquirer. In addition, the publisher criticized the Microsoft Zune for not supporting the standard Windows Media DRM system, rendering protected WMA files unplayable on the device.
WMA Pro, a newer and more advanced codec, supports multichannel and high resolution audio. A lossless codec, WMA Lossless, compresses audio data without loss of audio fidelity.[4] And WMA Voice, targeted at voice content, applies compression using a range of low bit rates.
AAC to WMA Audio Converter
NoteBurner AAC to WMA Converter is an audio tool that removes DRM copy protection from audio files. Purchased songs from digital music services like Napster, or the iTunes Store often come with DRM restrictions that stop you from using other portable devices. NoteBurner installs a software driver that emulates a CD-RW drive which works with your media player software to remove DRM protection.
The Interface of NoteBurner AAC to WMA Converter. NoteBurner has a clean and simple interface that is easy to learn. When first run, you will be greeted with a startup screen that gives you basic tips on how to get started. At the top of the screen there are four icons to click on that quickly get you to all the features of NoteBurner; incidentally, hovering your mouse pointer over each one displays a tooltip that describes what each icon is for. On the main screen there is a convenient feature where you can click on an icon to launch your default media player. Overall the interface is user-friendly, and efficient to use.
Configuration: The settings menu has a reasonable set of configuration options so that you can tweak how NoteBurner AAC to WMA Converter deals with your audio files. You can set the default folder that music is saved to, change audio formats, choose various CBR and VBR encoding bitrates, select ID3 tag versions 1 and 2, and enable NoteBurner to automatically run every time you start Microsoft Windows.






