DIY Open Source Bluetooth Headphones -- Episode 586

Sounds like a great idea.

How much of the old conference phone are you planning on retaining ? Some have onboard DSP for AEC processing and built-in touch screens for dialling, config and status.

I sometimes use the now discontinued Sennheiser Team Connect Wireless system at work and it has Bluetooth, NFC, USB, 3.5mm connectivity to the master speaker-mic puck, then uses something like DECT wireless to the 3 satellite speaker-mic pucks. Works really well in smaller rooms but really needed the ability to be able to support many more satellite pucks for larger venues. It was designed for use with up to 6 people at up to 4 round tables so 24 max.

New to group, I looks like this is about 2 years old, .(Jan 2023) ---Has any on taken on a Conference room Speaker/Micro over Classic Bluetooth or even BLE ?  I agree with the frustration in ESP32 models, what features are in and what are not.   Also, BLE is a totally different animal than Bluetooth Classic.  Any help or guidance would be appreciated --- I am trying to put a Bluetooth speaker/microphone an old desktop phone handset.

I don´t know of any ready made board to do that, but you can certainly write a program to save the received data to an sd, card , maybe even do vconversion to a common audio format on board. for recording the mic you will need a DAC and amplifier cicuitry.

Hi.

Great many thanks for this cool project. Now, I want to record the recieved audio and the mic input audio on this bluetooth device end. What kind of board is able to do that , please ?

I'm thinking, I want to record the incoming audio before it gets converted to analogue and sent to line out. Also the mic audio gets digitised and then I record that. 

So I guess I won't need any ADC or DAC. Just an extension board with microsd support and enough juice to do this audio data saving.

What kind of board do I need here ?

Thank you all.

Thanks for the info. I've seen Feasycom also incorporate the Qualcomm chips into a module and there's one that mentions ANC (FSC-BT1057) so I'm going to explore that a bit more too and check it actually comes with the software already on it!

a lot of manufacturers only sell to "preferred OEMs" so you A have to have abusiness of course but also go through that manufacturers audit. pretty much impossible for a someone just making a prototype. But you may be able to find Devkits or Evaluation boards that already use the desired functionality.

Active noise canceling is afield I have not tapped into yet,  BUT:
https://www.analog.com/en/analog-dialogue/articles/audio-noise-reduction-ic.html
Analog Devices has a chip that could be easier to get.

Hey, new to the community here. This was an amazing video! The editing back in time had me laughing away. I'm looking at doing a headphone project and going above and beyond the level of my other projects. I really want to do active noise cancelling which led me to Qualcomm chips. From what I can make out though you have to buy the ANC features as well as the chip itself and to do so you need to be a registered business! It seems a bit of a mine field. Would you have any suggestions for a project with ANC? Would it be possible on an ESP32 or maybe there is a way to use the Qualcomm chips which will probably give the best end product.

Didn't Sennheiser already do that last year with their RS 120-W headphones?

https://www.youtube.com/watch?v=7VQn36cxfuI

There is also the Nexum Voce transceiver which looks like it uses LC3 when in broadcast mode

https://www.kickstarter.com/projects/nexumaudio/voce-the-first-le-audio-adapter-enable-wireless-hifi-sound

it would be great to implement the new codec, but with open source spirit comes accessability of alteration, and therefore first a long time maintained (preferably arduino-) lib for those modules should be done first, and I'm not capable of doing that.
but yeah if that would be done, than having a version with LC3 and nRF5340 is a cool roadmap goal.

After having roadtested the nRF5340 Audio DK, if you're going to create some Bluetooth headphones it would seem like a great opportunity to create one of the world's first headphones supporting the new LC3 codec over BLE.