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PCM9211 SPDIF input with AC-3 DTS audio

hizozawa lin
Prodigy 20 points
Other Parts Discussed in Thread: PCM9211

Hi 

I'd like to use PCM9211 for S/PDIF input, I2S output.

May I know if input AC-3 or DTS 5.1ch compressed audio to PCM9211, what I2S data will be output?

Understand that PCM9211 will detect such Non-PCM data and an error bit will be shown. But, what about the output data? Will be no data?

Or, the 5.1ch data be converted to 1-ch I2S data?

Thanks.

 

  • 0
    TI__Mastermind 27990 points
    Hi Hizozawa,

    The PCM9211 is capable of taking in SPDIF information and outputting 2 channel I2S audio. My understanding is that AC-3 and DTS will come out in a coded format that a DSP will need to decode into the appropriate number of audio channels.

    Justin
  • 0 in reply to Justin Bohr
    Prodigy 20 points

    Hi Justin,

       Thanks!.

    So PCM9211 is able to "decode" AC3/DTS 5.1 compressed data to encode it to 2ch I2S.

    It seems no such information in the datasheet. Do you know where I can get such information? 

    And what I2S data format? If such 2ch encoded data is standard format or proprietary?

    Thanks!

    Hizozawa

  • 0 in reply to hizozawa lin
    TI__Mastermind 27990 points

    Hi Hizozawa,

    Well the data is encoded into 2 channel I2S and then sent over SPDIF, and the PCM9211 is able to unpack the SPDIF back into 2 channel I2S. This will not be valid I2S data, but the encoded audio for AC-3/DTS. The PCM9211 will indicate that it sees this (a flag bit), and make available the header type inforation about the stream in its registers, but wont do any decoding, that will need to be done on a DSP using code that has licensed functions to do so.

    Justin