Difference between revisions of "How do I play an AAC stream? What version of AAC do you support?"
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Both the [[wikipedia:Advanced Audio Coding|AAC (AAC LC)]] and [[wikipedia:AAC+|AAC+ (HE-AAC)]] are supported. In AAC+ both [[wikipedia:Spectral band replication|SBR]] (v1) and [[wikipedia:Parametric Stereo|PS]] (v2) are supported. | Both the [[wikipedia:Advanced Audio Coding|AAC (AAC LC)]] and [[wikipedia:AAC+|AAC+ (HE-AAC)]] are supported. In AAC+ both [[wikipedia:Spectral band replication|SBR]] (v1) and [[wikipedia:Parametric Stereo|PS]] (v2) are supported. | ||
Nevertheless it has to be noted that depending on the Encoder settings (sampling rate, compresssion ...) | |||
in our device some of the parametric functions of the High Efficiency AAC v2 Profile (SBR, PS) might not be resolved during decoding. | |||
More specific: the Parametric Stereo and the Spectral Band Replication are dynamically removed when the DSP is overloaded. | |||
As effect in the decoded audio you loose the Stereo effect and the high frequency range. | |||
In order to optimize audio quality for your solution we do recommend to use MONO where possible (e.g. for in-store background music) | |||
and lower sampling rate (e.g. 32KHz instead of 48KHz). In this way the stream bit-rate is used at its best giving the highest perceivable audio quality. | |||
Back to [[FAQ]] | Back to [[FAQ]] | ||
Revision as of 09:42, 25 October 2012
To play an AAC stream use an Exstreamer 110 labelled with "AAC+ capable" on the bottom. The software must be the Streaming Client 2.x (preloaded in the Exstreamer 110).
Both the AAC (AAC LC) and AAC+ (HE-AAC) are supported. In AAC+ both SBR (v1) and PS (v2) are supported.
Nevertheless it has to be noted that depending on the Encoder settings (sampling rate, compresssion ...) in our device some of the parametric functions of the High Efficiency AAC v2 Profile (SBR, PS) might not be resolved during decoding. More specific: the Parametric Stereo and the Spectral Band Replication are dynamically removed when the DSP is overloaded. As effect in the decoded audio you loose the Stereo effect and the high frequency range.
In order to optimize audio quality for your solution we do recommend to use MONO where possible (e.g. for in-store background music) and lower sampling rate (e.g. 32KHz instead of 48KHz). In this way the stream bit-rate is used at its best giving the highest perceivable audio quality.
Back to FAQ
