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  2. Comparison of audio coding formats - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_audio_coding...

    For example, MP3 and AAC dominate the personal audio market in terms of market share, though many other formats are comparably well suited to fill this role from a purely technical standpoint. First public release date is first of either specification publishing or source releasing, or in the case of closed-specification, closed-source codecs ...

  3. Advanced Audio Coding - Wikipedia

    en.wikipedia.org/wiki/Advanced_Audio_Coding

    Advanced Audio Coding (AAC) is an audio coding standard for lossy digital audio compression. It was designed to be the successor of the MP3 format and generally achieves higher sound quality than MP3 at the same bit rate. [4] AAC has been standardized by ISO and IEC as part of the MPEG-2 and MPEG-4 specifications.

  4. High-Efficiency Advanced Audio Coding - Wikipedia

    en.wikipedia.org/wiki/High-Efficiency_Advanced...

    The HE-AAC profile decoder is fully capable of decoding any AAC profile stream. Similarly, The HE-AAC v2 decoder can handle all HE-AAC profile streams as well as all AAC profile streams. Based on the MPEG-4 Part 3 technical specification. [1] Evolution from MPEG-2 AAC-LC (Low Complexity) Profile and MPEG-4 AAC-LC Object Type to HE-AAC v2 ...

  5. Unified Speech and Audio Coding - Wikipedia

    en.wikipedia.org/wiki/Unified_Speech_and_Audio...

    xHE-AAC is supported in Android since Android Pie [8] and in iOS since iOS 13. It has been announced that it will be added to watchOS 7 [22] [23] and has been licensed to Microsoft. [24] Playing xHE-AAC audio files is supported in foobar2000 with the use of an add-on AAC decoder. [25] In October 2022, Windows 11 added support for xHE-AAC in the ...

  6. MPEG-4 Part 3 - Wikipedia

    en.wikipedia.org/wiki/MPEG-4_Part_3

    Hierarchical structure of AAC Profile, HE-AAC Profile and HE-AAC v2 Profile, and compatibility between them. The HE-AAC Profile decoder is fully capable of decoding any AAC Profile stream. Similarly the HE-AAC v2 decoder can handle all HE-AAC Profile streams as well as all AAC Profile streams. Based on the MPEG-4 Part 3 technical specification ...

  7. Adaptive Multi-Rate Wideband - Wikipedia

    en.wikipedia.org/wiki/Adaptive_Multi-Rate_Wideband

    The frequencies from 6.4 kHz to 7 kHz are only transmitted in the highest bitrate mode (23.85 kbit/s), while in the rest of the modes the decoder generates sounds by using the lower frequency data (75–6400 Hz) along with random noise (in order to simulate the high frequency band). [8]

  8. AAC-LD - Wikipedia

    en.wikipedia.org/wiki/AAC-LD

    The AAC-LD coding scheme bridges the gap between speech coding schemes and high quality audio coding schemes. Two-way communication with AAC-LD is possible on usual analog telephone lines and via ISDN connections. It can use a bit rate of 32 - 64 kbit/s or higher. [10]

  9. List of R-phrases - Wikipedia

    en.wikipedia.org/wiki/List_of_R-phrases

    R4 Forms very sensitive explosive metallic compounds R5 ... R48/23/24/25 Toxic: danger of serious damage to health by prolonged exposure through inhalation, in ...