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Multitrack recorder

Pablo Fonovich
Intellectual 765 points

Other Parts Discussed in Thread: PCM4204

Hi:

I am looking for some information to build my own multitrack recorder. I need it to have 16 channels, and of coure, i must be able to store the recordings of each channel in a separate track. I have been looking for the rigth ADCs.

First i came up with the PCM1850, it has 6 stereo inputs, so i thought i should be able to use it as 12 mono inputs... The problem is that i dont know if that ADC allows me to record each channel sepparatly or that if mixes all channels. I found it has no TDM, and as i understood for the block diagram, i think everey channel is multiplexed into the same delta sigma modulator. Thats why i dont know if i can store the audio on every channel alone or if the ADC mixes all inputs and then i would only be able to get the right and left output. Anybody knows about that?

Other ADC that cought my attention was the PCM4204. It has 4 channels and i can combien 2 of them to get 8 inputs. I think that i also can get each channel sepparately by the SDOUT with a TDM format.

Now if i use 2 of them i understood that i could get 8 channels in the same output... So using 4 (combined by 2) i could get the desired 16 channels in 2 digital outputs... Is that right? And if it is right.. i would need to use some DSP with 2 digital inputs, wouldnt i? which DSP can you recommend me for a multitrack recorder?

All the data should be stored in a SD memory as raw data.. or if its possible, each channel should be finally stored as a .wma or .flac audio file in that memory.

If someone could help me i would be very happy

  • 0
    TI__Guru**** 189401 points

    Hi, Pablo,

    that is pretty much the exact target market of the PCM4204. Since this market is quite small and each company has their own special way of doing things, we never released any information on how to design a multitrack recorder, so I'm afraid we can't be of much assistance to you. 

    Perhaps someone in the Community would care to share their thoughts with you. 

    d2

  • 0 in reply to Don Dapkus
    Intellectual 765 points

    Hi:

    First of all thanks for your answer...

    So now i know that with that ADC i can achive what i want. I understand that you cant assist me in how to build my multitrack recorder, but could you recommend me any DSP or digital audio processor with two independent digital inputs that accepts TDM format? If i dont find any i suppose i will start building it with only 8 inputs...

    Thanks for your attention. Perhaps this questions should be in a DSP forum, but if you can recommend me a good DSP for audio i would be very gratefull.