| 摘要 |
<p>The invention provides a simple process for recording two channel stereo sound on photographic sound film, which is compatible with mono sound, equipment for effecting the process and an adapter for playing the film back. The width of the sound stripe on the film is modulated according to the sound from one channel, while the centre line of the stripe is modulated according to the sound from the other channel. The equipment comprises a light window whose width is determined by two strings arranged side by side in a magnetic field and switched electrically in series. The outer terminals are connected to two resistances switched in series and parallel to the strings. Their junction, as that of the strings, is connected to a modulated power source corresponding to the second channel, so that both strings are moved together.</p> |
