ESP32 Forum

Hi
Just a small update from here - I did some DSP/biquads on the audio stream and got some experience on how far it can be pushed.

1. Float math very easy to work with and only low overhead compared to fixed point math
2. IDF rev 2.0 rc update gave 50 % better performance on my float DSP/biquad implementation
3. Still has not succeed to use fixed point multiply accumulated optimized instructions

Still have not got any update on missing APLL. It is very much needed as audio SNR due to I2S_BSCK jitter is not good.

Regards Jørgen

Hi guys

Nice to hear that! I just want to stay up to date, joining this thread.

hi

I have never touched or had or have never had a lyra in my hand, am so sory for this ....never get it to play with them...






but now, ... it seems like lyra is getting a competitor now.

other version:

..and not only lyra, this RDA5x series it's damned serious to take.

happy new year

best wishes
rudi

hi folks

ESP32-LyraTD-MSC board arrived last days EU









there was a firmware preinstalled, comes without document but after i backup'ed the firmware
before i start - could find some things in the backup firmware
so sscm commands was here found, did build fast&dirty serial command tool and the first test with espressif preinstalled firmware was ok.

i find then by testings a nice Hint in the log and did try a imagine wakeword "HiEspressif Alexa" and
the second test then with espressif's own wakeword technic was successful.

i will try in next steps to get out the hardware on the Lyra board ( used DSP and so on ) and drive more testings then.
not sure, if there is one more people who get this audio hdk board now? ( engineering sample )

feel free to give some tips / share knowledge or ask your questions.

espressif noted, that nice firmwares follows for testings, stay tuned!


best wishes
rudi

btw:
a try with th sd card was first moment fail ( pullup missing )
( want test adduri file:// ..mp3)
but there is a switch/jumpler array - and i think we can switch pullups to the lines
so this is not a problem, will wait for the docu to the switch/jumpler array.
in the meantime i will use scope and route/search the lines - perhabs i find the src.
let's see what happen's

Where can we get one?

Where can we get one?

engineering samples - no MP yet - follow this thread
best wishes
rudi