Posts: 2
Joined: Thu Sep 28, 2017 11:09 am

Using a rp3 as a hearing aid loop system

Thu Sep 28, 2017 12:09 pm

I'm a noob to the pi i have a rp3 and currently just use it for olec to stream my entertainment. However i want to use my rp3 as an hearing aid loop so i can t-coil. As an hearing aid user it's so annoying having boosted hearing and picking up everything around you yet the tv you can't focus on. Hearing aids the latest ones today cost loads and the equipment to loop is also expensive from a point of view. If i bought a streamer pro i could connect to the pi via bluetooth with wearing my neck loop and other devises, but i don't want to buy that. I want to connect my rp3 to my dts, but 1st i need the loop hoping in some way a powered audio board could be used, in addition. Any hints tips or advice or anyone who has a project would love to hear from you.


Carter Nolan
Posts: 2
Joined: Sat Aug 26, 2017 6:55 pm

Re: Using a rp3 as a hearing aid loop system

Mon Oct 23, 2017 10:11 am

The following explanation may be of some help in enabling you to understand how an induction loop works.

Most listening devices nowadays have a switch checked M and T. Some even have M, MT and T. The M (microphone) position is for "typical" tuning in, that is accepting airborne sound by means of the receiver worked into the portable microphone. The T (telecoil) position is for accepting the sound by means of an enlistment curl which is worked into the portable microphone.

For the acceptance curl to give sound, an attractive field is required by means of which the sound is transmitted. This office in amplifiers was presented by various producers numerous years back and was then known as the "phone" or "telecoil" position on the listening device switch. It was proposed to make it less demanding for the amplifier client to hear via phone, by grabbing the sound by means of the attractive field created by the stomach curl in the collector of the phone.

In numerous areas, phone handsets now have this required ability. As of late, be that as it may, enlistment circle frameworks have started to be given out in the open places, for example, chapels, silver screens, and theaters, bank, ticket and data counters and work areas. It is even found in the home. In every one of these cases, the T office is utilized as a part of to listen inductively, without the impedance of airborne foundation sound. The MT position which is given on some portable amplifiers permits listening at the same time both to airborne sound by means of the mouthpiece and to inductively transmitted sound by means of the telecoil.

It is outstanding that when an exchanging current is gone through a wire, an attractive field is produced around the wire. On the off chance that a moment wire is brought inside this attractive field, a comparing substituting current is made of the second wire. In specialized dialect, it is said that a current is "initiated" in the second wire. Henceforth the expression "acceptance". This specific attractive guideline is the premise on which electrical engines, electrical generators, and transformers work. An enlistment circle for amplifier purposes likewise works similarly. An acceptance circle framework comprises of an enhancer and a circle. The enhancer can be associated with a sound source, for example, a TV or radio, a PA/sound fortification framework or a devoted amplifier.

The flag is intensified and nourished into the circle link, as a solid substituting current. The circle itself comprises of a protected wire, one turn of which is set around the border of the room. At the point when the exchanging current from the enhancer moves through the circle, an attractive field is made inside the room. On the off chance that a portable amplifier client switches their listening device to the T position, the telecoil in the portable hearing assistant gets the changes in the attractive field and changes them into substituting streams yet again. These are thus increased and changed over by the portable hearing assistant into sound. The attractive field inside the circle region is sufficiently solid to permit the individual with the amplifier to move around unreservedly inside the room and still get the sound at a decent, open to listening level. The execution of these frameworks is indicated in concurred global principles.

Some circle designs are not straightforward single wire encompassing a room, but rather the above clarification covers the fundamental standards.

Posts: 15
Joined: Sat Jun 01, 2013 9:29 am

Re: Using a rp3 as a hearing aid loop system

Thu Sep 26, 2019 10:32 am

Here's what I did:
I connected a simple mono audio amplifier with adjustable volume (~10W) to the sound output of the TV.
Purchased 6 m 40-pin ribbon cable (like for the older PATA-drives in a PC)
I attached the ribbon cable to all four sides of my couch (like a belt) and then soldered it together offset by one wire.
The remaining two wires were then connected to the amplifier output.
That worked very well when i sat on the couch watching TV (Until my neighbor placed his old tube TV behind the wall on my back :-(. I was very touched when he finally bought himself a flat screen because then it worked perfectly again.) .


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