Re: [LAD] Headless mix line in + Bluetooth

On Sat, Mar 27, 2021 at 02:50:28AM +0100, LuKaRo wrote:
> my grandmother needs headphones to watch TV, but wearing them causes
> her to miss all the conversation around her. Hearing aids that allow
> both TV and microphone input are around 2.5k€. As I'm quite firm with
> Linux, and have conducted several Raspberry Pi projects, I wondered if
> it was possible to find a DIY solution for this.

If there is some budget available, then alternative, low- or no-latency
approaches (albeit non-DIY) would be:

1. Old-school analogue approach (<€100 total). Plug TV into stereo
   input of mixer. Plug mic into mic input of mixer. Plug headphones
   (or Bluetooth transmitter, or induction earrings) into mixer
   headphone jack. Adjust levels to taste.

   - Small mixer e.g. https://www.thomann.de/gb/the_t_mix_mix_502.htm or
     similar (Behringer Xenyx 1002B is an alternative if you want a
     post-preamp insert point for a noise gate and/or compressor)

   - Gooseneck or measurement microphone e.g.
     https://www.thomann.de/gb/the_tbone_tb312s_schwanenhalsmikro.htm or
     https://www.thomann.de/gb/the_tbone_gm_5212.htm or
     https://www.thomann.de/gb/the_tbone_mm1.htm etc depending on
     desired polar pattern (i.e. depending on where you will put the mic
     and mixer, relative to the ambient sounds your grandma needs to
     hear)

   - Optional noise gate if your mixer has an insert jack, e.g.
     https://www.thomann.de/gb/behringer_nr300_noise_reducer.htm

   - Optional Bluetooth transmitter if she already has Bluetooth
     headphones, e.g.
     https://www.amazon.de/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=bluetooth+transmitter

   - Optional induction earrings or loop, if she wants to use her
     existing hearing aids instead of headphones, e.g.
     https://www.amazon.de/-/en/Monacor-3-5mm-Jack-Induction-Loop/dp/B003DPH854/
     or
     https://www.amazon.de/-/en/Geemarc-Iloop-Induction-Sling-Neckloop-black/dp/B06VWJV2ZH
     or
     https://www.amazon.de/-/en/Geemarc-CLHOOK3-Induction-Earrings-3-5/dp/B00400OD90

2. Buy her a pair of headphones or earphones that have ambient sound
   mixing functionality built in (<€250). E.g. Sony WH-1000XM3.

Good luck!

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