questions about 4ch microphone system with nxp platform(i.MX6ULL)

[pajeon]

Hello sir,
I have questions about 4ch microphone system with nxp platform(i.MX6ULL).

- system structure :
4 digital microphones -> PDM to I2S converter -> i.MX6ULL

PDM to I2S converter makes 4ch PDM input change 1port I2S.
However, i.MX6ULL supports 1.4Mbps that is written on datasheet(Document Number: IMX6ULLCEC Rev. 1.3, 08/2018).

Q#1.
I need an audio quality of 4ch 44.1Khz 16bit at least. Is it possible to use this platform without limitation?

Q#2.
If it is possible, is there any side-effect on this system ,like processing delay etc.,.

Q#3.
If it is impossible, what is the maximum audio quality for 4 channel input with this system?
Could you suggest me another solution to make 4CH digital microphone input by the one I2S port?

P.S,
I can not use analog microphone in this project.
There is just one spare I2S port.

Thanks

[igorpadykov]

Hi Jinhyung

>>Q#1. I need an audio quality of 4ch 44.1Khz 16bit at least.

>Is it possible to use this platform without limitation?? 

seems it is possible, from below link max. BCLK  =50MHz

https://community.nxp.com/t5/i-MX-Processors/What-is-the-maximum-bit-rate-of-the-iMX6UL-processor-s-...

So 50Mhz/ (4ch * 16bit ) = 781KHz

Best regards
igor

[pajeon]

Hello igor,

Thanks for your reply.

I have one more question.

i.MX6UL and i.MX6ULL have the same I2S specification?

Thanks

[igorpadykov]

yes the same.

Best regards
igor