AAC to OGG
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| - Information about AAC |
| Id |
| 1 |
| File extension |
| aac |
| File category |
| Audio |
| Stands for |
| Advanced Audio Coding |
| Developer |
| Bell Labs, Fraunhofer IIS, Dolby Laboratories, LG Electronics, Sony Corporation (Combined Efforts) |
| Overview |
| AAC is the descendant of the MP3 format. It provides better sound quality using a similar bit rate as of MP3. Besides this, it uses lossy data compression but it has high standards of audio quality than of MP3. We can find this format on a number of platforms and Apple's iTunes is one such example that uses it as default audio format. Size of its file is much smaller which is approximately one-tenth of MP3 file. It also neglects the redundant information that is not even processed by the human ear and is often not noticed. Although, this format was introduced as MPEG-2 Part-7, yet, standardization was done by ISO/IEC as a part of the MPEG-2 and MPEG-4 families. It is also termed as MPEG-2 NBC (Non- Backward Compatible) because it is incompatible with MPEG-1 audio formats i.e. MP1, MP2, MP3. |
| Technical description |
| Modified discrete cosine transform(MDCT) algorithm is used by AAC which ensures that it provides high compression efficiency. MPEG-2 PART-7 has three default profiles namely Low Complexity (LC), Main Profile (Main) and Scalable Sample Rate (SSR). These profiles come with Perceptual Noise Substitution which enhances coding efficiency and provides excellent audio quality. Furthermore, it uses Auditory Masking to ignore the surplus information. This codec has come up with advanced features which are not available in the predecessor. These include additional sample rates ranging from 8 to 96 kHz, 48 Channels, better efficiency with a simpler filter bank, higher coding efficiency for stationary signals and higher coding accuracy for transient signals. |
| Links |
| wikipedia.org |
| - Information about OGG |
| Id |
| 8 |
| File extension |
| ogg |
| File category |
| Audio |
| Stands for |
| Derived from the word Ogging. |
| Developer |
| Xiph.org Foundation |
| Overview |
| This extension is an open-source format which means that it can be used by users free of cost and anyone can implement it. The main function of this format is to compress the audio files. It is identical to MP3 file but there is one difference that can not be neglected. That is the sound quality which is better in OGG format. The same size of the file can provide users good quality of audio. It is an unpatented software which implies that no one has the copyright and there are no restrictions on its usage. Moreover, it can also support metadata which can help in storing the artist information and track data. Since 2007 this file is independently used by ‘Vorbis' audio files. |
| Technical description |
| The word OGG has been derived from the word ‘Ogging’ which is jargon or parlance(a technical slang) in a computer game named ‘Netrek'. This format is accessible in almost all the software of music players but there is one exception that is Apple. It allows various data streams to be entrenched or embedded in a solo file along with stream data as it has a container format. This codec has the capability of transferring and obtaining the independent signals over the same signal path by means of synchronized switches, which enables independent streaming of audio, video and text. Although, it is not a popular format as of MPEG standards, yet, it is beneficial for those who want to study and apply what is learned because of its free content. |
| Links |
| wikipedia.org |
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