Search found 59 matches

by Jakobsen
Fri Dec 07, 2018 5:10 am
Forum: General Discussion
Topic: How to obtain documented assembly listing ?
Replies: 4
Views: 193

Re: How to obtain documented assembly listing ?

Thanks - That was very help full for the DSP stuff I am working on.
I have been using obj dump until now but this is much more lean.
/Jakobsen
by Jakobsen
Mon Nov 26, 2018 11:31 am
Forum: Hardware
Topic: I2S Maximum Channels
Replies: 3
Views: 578

Re: I2S Maximum Channels

Yes Stereo audio in from HTTP audio stream - Split to 4 channels using 2xi2s hardware block I2S inst 0 : Left bass /Left treble - Amp 2 x single end I2S inst 1 : Right bass /Right treble - Amp 2 x single end Or alternative 2.1 system I2S inst 0 : Left treble /Right treble - Amp 2 single end I2S inst...
by Jakobsen
Tue May 15, 2018 10:38 am
Forum: Hardware
Topic: I2S Maximum Channels
Replies: 3
Views: 578

Re: I2S Maximum Channels

Hi Barometre Yes - I did a simple test last year. Simple crossover filter for bass / tweeter on left channel audio but only using on i2s output from the ESP32. Should be easy to use second i2s output for right channel as well. I will check if possible on my setup as well - The amp's we design takes ...
by Jakobsen
Thu Jan 18, 2018 8:51 am
Forum: Sample Code
Topic: audio DSP on the ESP32 chip
Replies: 2
Views: 1359

Re: audio DSP on the ESP32 chip

Did some DSP stuff on the ESP using BuddyCasino's web radio and the I2S input multilevel Audio amplifier from Merus Audio. I have stated a laying out a DSP audio library to do filtering, delay, audio flow frame work, etc - what ever is needed to do Audio system design with the ESP32. In doing so I h...
by Jakobsen
Wed Nov 22, 2017 10:33 am
Forum: General Discussion
Topic: I2C assert failed,and not work somtimes!
Replies: 7
Views: 1475

Re: I2C assert failed,and not work somtimes!

Hi
Same pattern here - I have audio running through wlan on Buddy Casinos Web radio and a web socket to monitor/control my amplifier using a I2C interface. I2C interface random crashed and only power cycle can get system back on track.
Love to get this bug nailed.
/Jørgen
by Jakobsen
Tue Oct 10, 2017 8:29 am
Forum: General Discussion
Topic: I2S digital audio amplifier board for ESP32 Vroom need recommendation
Replies: 8
Views: 1730

Re: I2S digital audio amplifier board for ESP32 Vroom need recommendation

Hi Noise issue is all gone :-) Check my post https://www.esp32.com/viewtopic.php?f=17&t=3176 And some I2S dac/amplifer will be insensitive to that any way. The 2x3W will do the job and get you going - But if you want party music level you need a stronger output stage. The Aliexpress option you menti...
by Jakobsen
Mon Oct 09, 2017 9:07 am
Forum: General Discussion
Topic: I2S digital audio amplifier board for ESP32 Vroom need recommendation
Replies: 8
Views: 1730

Re: I2S digital audio amplifier board for ESP32 Vroom need recommendation

Hi
I have just reviewed Adafruits class D line up. They do not sell any Merus Audio stuff, jet. Until then go with MAX9744 based 20W amp.
Regards /Jakobsen
by Jakobsen
Mon Oct 09, 2017 8:53 am
Forum: General Discussion
Topic: I2S digital audio amplifier board for ESP32 Vroom need recommendation
Replies: 8
Views: 1730

Re: I2S digital audio amplifier board for ESP32 Vroom need recommendation

Hi Lim Depends on what audio application you want to end up with. Today any I2S input amp is easy to get up and running. But if you want to increase output power, number of channels, do some audio design, things get a bit more complex. To get started go with the 2 ch adafruit amp. For next level stu...
by Jakobsen
Fri Sep 29, 2017 2:15 pm
Forum: Showcase
Topic: Audio PLL rocking :-)
Replies: 4
Views: 2767

Re: Audio PLL rocking :-)

@buddy - Yeeees -so Happy that I have time to do this stuff again. @Sprite - Cool if you stumble on some updated i2s.c, I will be very curious to find out what my magic factor (mf=2) is made of. I have dived into some of the DSP /filter stuff I had to put on hold due to daytime job and other persona...
by Jakobsen
Fri Sep 29, 2017 11:00 am
Forum: Showcase
Topic: Audio PLL rocking :-)
Replies: 4
Views: 2767

Audio PLL rocking :-)

Found time and a rev_1 ESP32 module to test out the fixed audio PLL - and heads up for Espressif - Performing just perfect :D http://5.103.131.182/esp32/img/esp32_apll_setup.jpg Small background story: In any audio streaming system, the receiving end needs to sync up to the sample pace that the sour...

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