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AAC LC encoder on C674x

Amnon Cohen-Tidhar
Prodigy 60 points

Hi,

We're using Ti's AAC LC encoder on 8148 dsp and when encoding dual mono channels, the quality drops compare to stereo encoding.

Does the AAC LC take advantage of the stereo correlation?  I thought only HEv2 does that.

Does half of the allocated bit-rate (CBR) is used for each channel, or can one channel take more bits than the other?

Thanks

Amnon

  • 0
    TI__Mastermind 30480 points

    Hi Amnon,

    For dual-mono encoding, correlation between channels is not considered.

    Bitrate will be equally devided between left and right channels.

    Thanks

    Ram

  • 0 in reply to Ramprasad
    Prodigy 60 points

    Thanks Ram,

    On the C674x the API doesn't support dual-mono configuration, only mono or stereo. If we use stereo for dual mono input, will your answer remains? will there be a quality degradation? can the encoder in this case encode one channels with more bits than the other?

    Just to verify, say I'm coding music on the left channel (mono) and noise on the right at 96kbps, will the music quality be the same as when coding 2 stereo music channels and listening only to the right channel?

    Amnon 

  • 0 in reply to Amnon Cohen-Tidhar
    TI__Mastermind 30480 points

    Hi Amnon,

    AAC-Encoder on C674x doesn't support dual-mono. There is C64x+ version of AAC encoder and it supports dual-mono.

    Yes, for a dual-mono input, when encoded as stereo, no correlation between left and right channels will be exploited and it may degrade the quality.

    Thanks

    Ram