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
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
So 50Mhz/ (4ch * 16bit ) = 781KHz
Best regards
igor
Hello igor,
Thanks for your reply.
I have one more question.
i.MX6UL and i.MX6ULL have the same I2S specification?
Thanks
yes the same.
Best regards
igor