Bucle inducción 1000m² ( BME-10) Ateïs

An **induction loop** (or magnetic loop) is an electromagnetic system consisting of a conductive wire arranged in a ring or coil shape that generates or detects a magnetic field based on **Faraday's law of induction**.

Depending on the context of its use, it serves various primary functions:

**1. Hearing accessibility (Magnetic loop)**

* **How ​​it works:** It transmits an audio signal directly to the hearing aids or cochlear implants of people with hearing impairments.
* **Application:** It is installed around the perimeter of a space (theaters, service counters, classrooms). The audio signal travels through the wire as a magnetic field, and the hearing aid's coil (set to the *T* or *Telecoil* position) converts it back into clear sound while filtering out background noise.

**2. Traffic and vehicle detection**

* **How ​​it works:** It detects the presence or passage of large metallic objects that alter the wire's inductance.
* **Application:** It is installed beneath the asphalt on roads and in parking lots. When a metal car is positioned over the loop, the electromagnetic change sends a signal to trigger traffic lights, open automatic barriers, or count vehicles.

**3. General physics and electronics**

* It forms the operating basis for **transformers**, **wireless chargers**, and **induction cooktops**, where the current flowing through an inductor loop induces a current or generates heat in a second element without direct physical contact.

A magnetic induction loop is an accessibility system that converts an acoustic audio signal into a magnetic field to transmit voice or music directly to the user's hearing aid or cochlear implant, eliminating background noise, reverberation, and distance-related issues.

Signal chain components
1. Audio input (Capture): Originates from a microphone, a public address system, a mixing console, or a television. 2. Loop amplifier: Unlike a conventional audio amplifier (which delivers voltage to speakers), this device regulates the electric current flowing through the conductor cable to generate a magnetic field proportional to the audio signal.
3. Loop cable (Transmitter): A copper wire installed around the room's perimeter (in the floor, baseboard, or ceiling) or at a service counter.
4. Telecoil (Receiver): A tiny copper coil integrated into the hearing aid or cochlear implant.

1.1. Conversion of audio to current:
In the dedicated amplifier.
Sound captured by the microphone enters the dedicated amplifier. It processes the signal using automatic gain control (AGC) to prevent peaks and maintains a constant current flowing through the loop cable.
2.2. Generation of the magnetic field:
Ampère/Faraday principle.
As alternating current flows through the perimeter cable, a magnetic field is generated within the enclosed area. The intensity of this field varies in frequency and amplitude, exactly mirroring the rhythm of the original audio.
3.3. Induction in the hearing aid:
Reception without physical contact.
When a person with hearing loss enters the loop zone and switches their hearing aid to the T (Telecoil) position, the device's internal coil intercepts the magnetic field. Through electromagnetic induction, it generates a small current identical to the original signal.
4.4. Conversion to clear sound:
In the user's ear.
The hearing aid processes this current, amplifies it according to the user's specific hearing profile, and sends it directly to the ear, completely isolating it from ambient room noise.

Key technical and operational advantages:
*Feature: Direct benefit
*Optimal signal-to-noise ratio: The signal arrives clearly, avoiding room echoes and audience murmurs.
*No external receivers: The user does not need to borrow equipment or use additional headphones; uses their own personal device.
*Universal standard: Operates under the international IEC 60118-4 standard, ensuring that any hearing aid with a telecoil works with any certified loop system worldwide.
*Unlimited simultaneous use: A single loop covers everyone within the coverage area without bandwidth saturation.