Animated film shows how sound waves are created by the human voice cause movement of air molecules and how this movement is transmitted through the flexible diaphragm of the telephone mouthpiece. The electrons passing through carbon granules in the mouthpiece are transformed into electric current and the magnet and flexible diaphragm in the telephone receiver transforms the current into sound waves. An old man and a kid talking into phone.
This historic stock footage available in HD video. View pricing below video player.
Type | Size | Price (USD) Comprehensive All Media License |
Price (USD) Digital-Only License |
---|---|---|---|
HD Master, Broadcast-ready (1920x1080, unmarked) | 8263 MB | $295.00 | $79.00 |
HD Screener (1920x1080, full-res with timecode) | 8263 MB | FREE or $4 (see below) | FREE or $4 (see below) |
Proxy (320x240, low-resolution, watermarked) | 133 MB | FREE or $4 (see below) | FREE or $4 (see below) |