Densification of Communication Lines and Channels

The film sets out the physical foundations of multichannel telephone communication in a figurative and accessible form. 1 part. Animation and schematic images, made with a computer, demonstrating the physical foundations of multichannel telephone communication: frequencies and amplitudes of oscillations, a graph of non-sinusoidal oscillations, spectra of sounds; channel frequency bands, frequency conversion; amplitude modulation (280.3 m). Part 2. Animation and schematic images, made with the help of a computer, demonstrating the physical foundations of multichannel telephone communication: a modulator of the simplest circuit, a complex combination of initial oscillations; carrier projection about signal, signal current circuit; four-wire high-frequency telephony scheme (280.2 m)

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