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AUDIO Example in DM648

gidi barak
Intellectual 320 points
Other Parts Discussed in Thread: TLV320AIC33

Audio  Example on DM648

 

Hello

We are trying to work with the audio example in the DM648 .

The project example name is  AUDIO_GIO which located  under the Examples directory .

This example is receiving   Audio via the line in input of the 648 EVM and sending the Audio

output  to the Speakers via the Line out mini RCA  connector .

 

My question is ,what kind of digital audio format exist in this code  after the signal is

sampled and put in a memory buffer ?

The input codec is AIC33 chip which is not doing any compression to the signal (as far as I

know ) .So it means that synthetic normal  audio , from outside file can be played .

Is that correct ?  

Can I use simple raw audio data from the type of  A low , U low or PCM uncompressed ?

I want to create an audio file by outside PC SW and use the audio data of this file to be

 loaded to The internal memory of the DSP chip and play it towards  Audio output line .

The question is what is the file type of the audio I need to sample that will comply to the

internal digital audio format inside this specific example ?

Is it better to use the SPEECH_ENC_DEC example for that purpose ?

 

Thanks

Gideon

 

  • 0
    Prodigy 170 points

    Gideon,

    You might want to consider reading documentation about McASP peripheral in the DM648 device and the TLV320AIC33 codec.

    As far as I can remember, the codec uses 2's complement 8-,16-,24- or 32 bits numbers for I/O, and I might be even possible to set it up to use u- or A-law hardware compression. The codec also supports mono and stereo audio and various sampling rates.

    If I recall it correctly, the codec is programmable over the I2C bus.

    The audio port supports the same bit widths as well as mono and stereo data.

    You can use any audio file format, provided you have the right software to perform compression and/or decompression.

    To begin with, you might want to use a raw audio data format, which is basically just interleaved L,R (if stereo) digital audio samples.

    Rgds,

    Andrew