ISO/IEC 13818-7:2006
Information technology - Generic coding of moving pictures and associated audio information - Part 7: Advanced Audio Coding (AAC)
- Standard No.
- ISO/IEC 13818-7:2006
- Release Date
- 2006
- Published By
- International Organization for Standardization (ISO)
- Status
- Replace By
- ISO/IEC 13818-7:2006/Amd 1:2007
- Latest
- ISO/IEC 13818-7:2006/Cor 2:2010
- Scope
- 1 General This International Standard describes the MPEG-2 audio non-backwards compatible standard called MPEG-2 Advanced Audio Coding, AAC [1], a higher quality multichannel standard than achievable while requiring MPEG-1 backwards compatibility. This MPEG-2 AAC audio standard allows for ITU-R “indistinguishable” quality according to [2] at data rates of 320 kbit/s for five full-bandwidth channel audio signals. The AAC decoding process makes use of a number of required tools and a number of optional tools. Table 1 lists the tools and their status as required or optional. Required tools are mandatory in any possible profile. Optional tools may not be required in some profiles. 2 MPEG-2 AAC Tools Overview The basic structure of the MPEG-2 AAC system is shown in Figure 1 and Figure 2. As is shown in Table 1, there are both required and optional tools in the decoder. The data flow in this diagram is from left to right, top to bottom. The functions of the decoder are to find the description of the quantized audio spectra in the bitstream, decode the quantized values and other reconstruction information, reconstruct the quantized spectra, process the reconstructed spectra through whatever tools are active in the bitstream in order to arrive at the actual signal spectra as described by the input bitstream, and finally convert the frequency domain spectra to the time domain, with or without an optional gain control tool. Following the initial reconstruction and scaling of the spectrum reconstruction, there are many optional tools that modify one or more of the spectra in order to provide more efficient coding. For each of the optional tools that operate in the spectral domain, the option to “pass through” is retained, and in all cases where a spectral operation is omitted, the spectra at its input are passed directly through the tool without modification. The input to the bitstream demultiplexer tool is the MPEG-2 AAC bitstream. The demultiplexer separates the parts of the MPEG-AAC data stream into the parts for each tool, and provides each of the tools with the bitstream information related to that tool.
ISO/IEC 13818-7:2006 history
- 2010 ISO/IEC 13818-7:2006/Cor 2:2010 Corrigendum 2 - Information technology -- Generic coding of moving pictures and associated audio information -- Part 7: Advanced Audio Coding (AAC) -
- 2009 ISO/IEC 13818-7:2006/Cor 1:2009 Information technology - Generic coding of moving pictures and associated audio information - Part 7: Advanced Audio Coding (AAC); Technical Corrigendum 1
- 2007 ISO/IEC 13818-7:2006/Amd 1:2007 Information technology - Generic coding of moving pictures and associated audio information - Part 7: Advanced Audio Coding (AAC) - Amendment 1: Transport of MPEG surround in AAC
- 2006 ISO/IEC 13818-7:2006 Information technology - Generic coding of moving pictures and associated audio information - Part 7: Advanced Audio Coding (AAC)
- 2005 ISO/IEC 13818-7:2004/Cor 1:2005 Information technology - Generic coding of moving pictures and associated audio information - Part 7: Advanced Audio Coding (AAC); Technical Corrigendum 1
- 2004 ISO/IEC 13818-7:2003/Amd 1:2004 Information technology - Generic coding of moving pictures and associated audio information - Part 7: Advanced Audio Coding (AAC); Amendment 1: Embedding of bandwidth extension
- 2004 ISO/IEC 13818-7:2004 Information technology - Generic coding of moving pictures and associated audio information - Part 7: Advanced Audio Coding (AAC)
- 2003 ISO/IEC 13818-7:2003 Information technology - Generic coding of moving pictures and associated audio information - Part 7: Advanced Audio Coding (AAC)
- 1998 ISO/IEC 13818-7:1997/Cor 1:1998 Information technology - Generic coding of moving pictures and associated audio information - Part 7: Advanced Audio Coding (AAC); Technical corrigendum 1
- 1997 ISO/IEC 13818-7:1997 Information technology - Generic coding of moving pictures and associated audio information - Part 7: Advanced Audio Coding (AAC)
