1. Ps Vita Youtube

Lossy audio compression format Advanced Audio CodingMPEG/3GPP container.,.mp4,Apple container.m4a,.m4b,.m4p,.m4r,.m4vADTS stream.aacaudio/aacaudio/aacpaudio/3gppaudio/3gpp2audio/mp4audio/mp4a-latmaudio/mpeg4-genericDeveloped by,Initial release1997; 23 years ago ( 1997)Type of formatAudio compression format,Contained by, and Audio Data Interchange Format (ADIF),Advanced Audio Coding ( AAC) is an for. Designed to be the successor of the format, AAC generally achieves better sound quality than MP3 at the same.AAC has been standardized by and, as part of the and specifications. Part of AAC, ('AAC+'), is part of and also adopted into standards and, as well as standards and.AAC supports inclusion of 48 full- (up to 96 kHz) in one stream plus 16 low frequency effects (, limited to 120 Hz) channels, up to 16 'coupling' or dialog channels, and up to 16 data streams. The quality for is satisfactory to modest requirements at 96 kbit/s in mode; however, demands data rates of at least 128 kbit/s.

Tests of MPEG-4 audio have shown that AAC meets the requirements referred to as 'transparent' for the at 128 kbit/s for stereo, and 320 kbit/s for audio. AAC uses a purely (MDCT) algorithm, giving it higher compression efficiency than MP3, which uses a hybrid coding algorithm that is part MDCT and part.AAC is the default or standard audio format for, and various phones.

It is supported on, (with the 1.1 update installed), series and later,. AAC is also supported by manufacturers of in-dash car audio systems. Contents.History Background The (DCT), a type of for, was proposed by in 1972, and developed by Ahmed with T. Natarajan and in 1973, publishing their results in 1974. This led to the development of the (MDCT), proposed by J. Johnson and A.

Bradley in 1987, following earlier work by Princen and Bradley in 1986. The introduced in 1994 used a hybrid coding algorithm that is part MDCT and part. AAC uses a purely MDCT algorithm, giving it higher compression efficiency than MP3.AAC was developed with the cooperation and contributions of companies including,.

It was officially declared an international standard by the in April 1997. It is specified both as Part 7 of the MPEG-2 standard, and Subpart 4 in Part 3 of the MPEG-4 standard. Standardization In 1997, AAC was first introduced as MPEG-2 Part 7, formally known as / 13818-7:1997. This part of MPEG-2 was a new part, since MPEG-2 already included MPEG-2 Part 3, formally known as ISO/IEC 13818-3: MPEG-2 BC (Backwards Compatible). Therefore, MPEG-2 Part 7 is also known as MPEG-2 NBC (Non-Backward Compatible), because it is not compatible with the audio formats (, and ).MPEG-2 Part 7 defined three profiles: Low-Complexity profile (AAC-LC / LC-AAC), Main profile (AAC Main) and Scalable Sampling Rate profile (AAC-SSR). AAC-LC profile consists of a base format very much like AT&T's Perceptual Audio Coding (PAC) coding format, with the addition of (TNS), the (described below), a nonuniform, and a reworking of the bitstream format to handle up to 16 stereo channels, 16 mono channels, 16 low-frequency effect (LFE) channels and 16 commentary channels in one bitstream.

The Main profile adds a set of recursive predictors that are calculated on each tap of the filterbank. The uses a 4-band filterbank, with four shorter filterbanks following, in order to allow for scalable sampling rates.In 1999, MPEG-2 Part 7 was updated and included in the MPEG-4 family of standards and became known as, MPEG-4 Audio or ISO/IEC 14496-3:1999. This update included several improvements. One of these improvements was the addition of which are used to allow interoperability with a diverse range of other audio formats such as, Interface. Another notable addition in this version of the AAC standard is Perceptual Noise Substitution (PNS). In that regard, the AAC profiles (AAC-LC, AAC Main and AAC-SSR profiles) are combined with perceptual noise substitution and are defined in the MPEG-4 audio standard as Audio Object Types.

MPEG-4 Audio Object Types are combined in four MPEG-4 Audio profiles: Main (which includes most of the MPEG-4 Audio Object Types), Scalable (AAC LC, AAC LTP, CELP, HVXC, TwinVQ, Wavetable Synthesis, TTSI), Speech (CELP, HVXC, TTSI) and Low Rate Synthesis (Wavetable Synthesis, TTSI).The reference software for MPEG-4 Part 3 is specified in MPEG-4 Part 5 and the conformance bit-streams are specified in MPEG-4 Part 4. MPEG-4 Audio remains with MPEG-2 Part 7.The MPEG-4 Audio Version 2 (ISO/IEC 14496-3:1999/Amd 1:2000) defined new audio object types: the low delay AAC object type, bit-sliced arithmetic coding (BSAC) object type, parametric audio coding using and error resilient (ER) versions of object types. It also defined four new audio profiles: High Quality Audio Profile, Low Delay Audio Profile, Natural Audio Profile and Mobile Audio Internetworking Profile.The Profile (AAC LC with ) and AAC Profile (AAC LC) were first standardized in ISO/IEC 14496-3:2001/Amd 1:2003. The HE-AAC v2 Profile (AAC LC with SBR and Parametric Stereo) was first specified in ISO/IEC 14496-3:2005/Amd 2:2006. The Parametric Stereo audio object type used in HE-AAC v2 was first defined in ISO/IEC 14496-3:2001/Amd 2:2004.The current version of the AAC standard is defined in ISO/IEC 14496-3:2009.AAC+ v2 is also standardized by as TS 102005.The standard also contains other ways of compressing sound. Main article:The audio coding standards MPEG-4 Low Delay, Enhanced Low Delay and Enhanced Low Delay v2 (, AAC-ELD, AAC-ELDv2) as defined in ISO/IEC 14496-3:2009 and ISO/IEC 14496-3:2009/Amd 3 are designed to combine the advantages of perceptual audio coding with the low delay necessary for two-way communication. They are closely derived from the MPEG-2 Advanced Audio Coding (AAC) format.

AAC-ELD is recommended by as super-wideband voice codec in the IMS Profile for High Definition Video Conference (HDVC) Service. Licensing and patents No licenses or payments are required for a user to stream or distribute content in AAC format. This reason alone might have made AAC a more attractive format to distribute content than its predecessor MP3, particularly for streaming content (such as Internet radio) depending on the use case.However, a patent license is required for all manufacturers or developers of AAC. For this reason, implementations such as and may be distributed in form only, in order to avoid patent infringement.

(See below under Products that support AAC, Software.)The AAC patent holders include,. Extensions and improvements Some extensions have been added to the first AAC standard (defined in MPEG-2 Part 7 in 1997):. Perceptual Noise Substitution (PNS), added in in 1999.

It allows the coding of noise as data. Long Term Predictor (LTP), added in MPEG-4 in 1999. It is a forward predictor with lower computational complexity. Error Resilience (ER), added in MPEG-4 Audio version 2 in 2000, used for transport over error prone channels. (Low Delay), defined in 2000, used for real-time conversation applications.

(HE-AAC), a.k.a. AacPlus v1 or AAC+, the combination of and AAC LC. Used for low bitrates. Defined in 2003., a.k.a.

AacPlus v2 or eAAC+, the combination of and HE-AAC; used for even lower bitrates. Defined in 2004 and 2006., defined in 2006, can supplement an AAC stream to provide a lossless decoding option, such as in Fraunhofer IIS's 'HD-AAC' productContainer formats. Main article:In addition to the, and other container formats based on for file storage, AAC audio data was first packaged in a file for the MPEG-2 standard using Audio Data Interchange Format (ADIF), consisting of a single header followed by the raw AAC audio data blocks.

However, if the data is to be streamed within an MPEG-2 transport stream, a self-synchronizing format called an Audio Data Transport Stream (ADTS) is used, consisting of a series of frames, each frame having a header followed by the AAC audio data. This file and streaming-based format are defined in, but are only considered informative by MPEG-4, so an MPEG-4 decoder does not need to support either format. These containers, as well as a raw AAC stream, may bear the.aac file extension.

Also defines its own self-synchronizing format called a Low Overhead Audio Stream (LOAS) that encapsulates not only AAC, but any MPEG-4 audio compression scheme such as. This format is what was defined for use in DVB transport streams when encoders use either or AAC extensions. However, it is restricted to only a single non-multiplexed AAC stream.

This format is also referred to as a Low Overhead Audio Transport Multiplex (LATM), which is just an interleaved multiple stream version of a LOAS. Products that support AAC. This section needs additional citations for.

See also:The native AAC encoder created in 's, and forked with, was considered experimental and poor. A significant amount of work was done for the 3.0 release of FFmpeg (February 2016) to make its version usable and competitive with the rest of the AAC encoders. Libav has not merged this work and continues to use the older version of the AAC encoder. These encoders are -licensed open-source and can be built for any platform that the FFmpeg or Libav frameworks can be built.Both FFmpeg and Libav can use the library via libfdk-aac, and while the FFmpeg native encoder has become stable and good enough for common use, FDK is still considered the highest quality encoder available for use with FFmpeg. Libav also recommends using FDK AAC if it is available. See also.

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Sony’s latest and greatest portable console has been on life support for years, but the company has repeatedly told fans of the PS Vita that it isn’t going anywhere. That abruptly ended this week, as Sony Interactive Entertainment SVP Hiroyuki Oda confirmed to during a media session that manufacturing of the PS Vita will cease in 2019, with shipping of the console expected to end soon after.“Currently, we do not have any plans regarding a new handheld device,” Oda revealed,.

“In Japan, we will manufacture PlayStation Vita until 2019. From there, shipping will end.”. Sony introduced the PS Vita in Japan in late 2011 before expanding into other markets in 2012.

With its widescreen display and powerful specs, the Vita broke onto the scene in a big way, but never quite caught on in Japan or abroad. Sony continued to support the device with free games for PlayStation Plus subscribers and regular system updates, but the library of games grew at a glacial place as developers began to see the writing on the wall.It became clear that time was running short for the portable console when Sony announced back in May that it would cease production of physical Vita games in America and Europe by the end of the fiscal year. Couple that with the fact that (as well as PS3 games) from its monthly selection of free games for PS Plus in March, and now this report from Famitsu, and it’s obvious that the Vita era is ending.