A device is considered a multichannel product if it includes a decoder that receives an AAC signal and decodes that signal into three or more channels of a different (compressed or uncompressed) audio format. A device that includes an encoder which is capable of producing an encoded AAC signal that consists of three or more channels is also considered a multichannel product.
"Channel" here means an audio channel, as in left, right, center, back-left, etc., and not, for example a television broadcast channel. Examples of multichannel products include: a device that produces a six-channel PCM signal at the output stage of a decoder; a device that presents a six-channel analog signal at the back panel of an A/V receiver; or a device which transcodes a 5.1 channel AAC signal into a different (compressed or uncompressed) format.
As an exception to the above, a device that decodes a multichannel AAC signal and only down-mixes to stereo (either during or after decoding), without providing any multichannel output, would not be considered a multichannel product.
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