It enables us to fit 3000 music tracks on a 4GB memory card! Amazing!

MPEG-4 aacPlus is the combination of three MPEG technologies comprising Advanced Audio Coding (AAC), coupled with Coding Technologies’ Spectral Band Replication (SBR), and Parametric Stereo (PS) technologies. SBR is a unique bandwidth extension technique which enables audio codecs to deliver the same quality at half the bit rate. PS significantly increases the codec efficiency a second time for low bit rate stereo signals.

SBR and PS are both forward and backward compatible methods to enhance the efficiency of any audio codec. As a result, aacPlus delivers streaming and downloadable 5.1 multi-channel audio at 128 kbps, near CD-quality stereo at 32 kbps, excellent quality stereo at 24 kbps, and good quality for mixed content even below 16 kbps mono. This level of efficiency fundamentally enables new applications in the markets of mobile and digital broadcast.

Features
• True Superset architecture
• Multi-channel support for 5.1, 7.1 and beyond (48 channels total)
• Built-in error concealment for mobile applications
• CD-quality stereo down to 48 kbps
• Near CD-quality stereo at 32 kbps
• Excellent quality stereo down to 24 kbps
• Widest available audio bandwidth

Example applications
• 3G mobile music and A/V services
• Internet audio for streaming and download
• Digital Radio
• Digital Satellite and Cable broadcasting
• IPTV
• Portable players

Independent quality evaluations of aacPlus

aacPlus v1 has been evaluated in multiple 3rd party tests by Digital Radio Mondiale, MPEG, the European Broadcasting Union, and the Institute für Rundfunktechnik IRT. aacPlus v1 outperformed all other codecs in the competition. Below is the results graph from the European Broadcasting Union testing at 48 kbps stereo.

My take on it:

It means smaller size but the sound quality remains the same or greater than a MP3 file. Depends on your device, it might sound good also might not. If you compare this format to MP3, you will find such difference with it. aacPlus sounds less crisper than MP3 as it uses Parametric Stereo and SBR. I think this format is suitable and sufficient for portable media devices and radio streamings. For home theater systems, the sound quality is less pleasurable and somewhat tinny compared to MP3 and WMA.

Source: Coding Technologies

Convert Music Files

You can convert your music files into aacPlus using Easy CD-DA Extractor by Poikosoft.

Instructions:
1.Install the software
2.Open the program
3.Choose the music files that you want to be converted
-You can drag the music file to the program window
4When choosing settings, be sure to pick this one.

48kbps.png
After that, click convert files. The file conversion might take fast as 10-15secs depending on your computer’s processor.

Comparison between file sizes after file conversion

compare.png

There you go, the source file(MP3) which is 3.6MB(128KBPS). After converted to aacPlus, the file size had been much smaller 1.4MB(48KBPS). In my listening tests between the two files, there no such difference.
It’s equally pretty the same but not in size. I really recommend aacPlus to all. Plus, aacPlus format is designed to work for Nokia XpressMusic phones. That’s why i’ve manage to put 200 songs on my Nokia memory card.

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