1. IEC 60268-1 Field Generator
We now know enough information to compute the magnetic flux density for the field generator coils device.
Challenge 12 continues this via study of the other styles of generating uniform magnetic fields within a certain volumetric region of space.
2. Hearing loops
Hearing loop systems consist of:
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a loop of wire around a particular area
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fed the audio from a public address audio system as a current (instead of a voltage).
→ Thus, the magnetic flux inside the loop directly follows the audio signal.
Many hearing aids have a "T-coil" feature which picks up this magnetic field and sends the audio signal to the hearing aid’s speaker. T-coils were originally created to pick up the audio signal directly from the voice coil of a telephone’s earpiece. This enables a higher quality pickup of a telephone system compared to using a microphone which picks up all ambient sound.
| IMHO Such a system should be installed in the Chapel! You now understand 80% of what’s needed to build and install such a system! |