Optical sound - Wikipedia

9.5 mm film - Wikipedia

Why is the sound so low quality in old movies? - Quora

When was audio recording invented? - Quora

What was the first audio visual recording? - Quora

How does optical sound-on-film work? I don't get how a monochrome 2D waveform can reproduce complex polyphonic sound. - Quora

Are they intentionally aiming for low production values with these 'from home' versions of TV shows? It would be so easy to have better pictures, sound and lighting with very basic home

Acousto-optic modulator - Wikipedia

Transmission medium - Wikipedia

Optical table - Wikipedia

Waveguide: Electromagnetic Wave, Sound, Optical Fiber, Light, Frequency, Microwaves, Rule of Thumb : Surhone, Lambert M., Timpledon, Miriam T., Marseken, Susan F.: : Libros

THE OPTIGONERS, The optigan and mellotron wheezing together.