It's the default audio format for Apple products, Nintendo products, Android, Blackberry, PlayStation, and many in-dash music systems in cars. M4A files sound better than MP3 files when encoded at the same bit rate due to some of the enhancements. It was generally intended as the successor to MP3 and the file quality is better and file sizes smaller compared to MP3 files. M4A audio files were developed to enable easy sharing of digital music, audiobook content, podcasts. This is known as auditory masking, this allows the discarding of data with minimal loss of quality.Ī combination of Fraunhofer IIS, AT&T Bell Laboratories, Dolby and Sony Corporation The human hearing system cannot hear quiet sounds in the presence of loud sounds of a similar frequency for example, a voice conversation cannot be heard while an aeroplane flies low overhead. The current variant is specified in ISO/IEC standard 14496-3. It is also part of the MPEG-4 standard, it is most widely used to create small digital audio files. It too compresses digital audio files but to a bigger degree. Apple are the biggest users of this format and if you have an iPod or iPhone then you will have come across this format as it is iTunes default audio format.ĪAC is similar in concept to MP3 but goes further. It is at least one tenth the size of CD digital data. AAC is about half the size of MP3 but with better quality.
It essentially cuts out, or compresses, information that the human ear cannot pick up thereby making digital files smaller and more easily managed and therefore quicker to download.
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