Motion-picture sound film projector

Details Motion-picture sound film projector Motion-picture sound film projector

1977-10-28

1980-01-08

Hayes, Monroe H.

Optics: motion pictures

With sound accompaniment

Methods

352 27, G03B 3100, G03B 3102

Patent

active

041825543

ABSTRACT:
The film is provided with an audio track comprised of recorded sections alternating with unrecorded sections. An adjustable mixer having first and second inputs is connected to the input of the sound-reproducing unit. A first signal-transmission path extends from the output of the audio head for the audio track to the first input of the mixer. A second signal-transmission path extends to the second input of the mixer and transmits a second audio signal thereto. A control head located upstream of the audio head senses the presence or absence of recorded information on the audio track and controls the operation of an attenuator connected in the second signal-transmission path. The control head is connected to the attenuator via a time-delay circuit which introduces a time delay corresponding to the distance between the two heads. The second audio signal is derived from a second audio track on the film, which bears recorded audio information along its entire length, or is derived from an uninterruptedly operated magnetic-tape playback machine or phonograph. During reproduction of the audio information on the recorded sections of the main audio track, the transmission of the second audio signal to the mixer is automatically attenuated.

REFERENCES:
patent: 3907412 (1975-09-01), Schaller et al.

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