SU49351A1 - Method and device for reproducing sound intended to create the illusion of movement in space of sounding bodies - Google Patents

Description

In the usual way of demonstration of sound film-pictures, the sound proceeds necessarily from the screen due to the installation of reproducers in the immediate vicinity of the screen or behind it.

With such an installation of loudspeakers, the viewer in sound cinema unwittingly thinks the source of sound is also mechanized exclusively around or on the screen.

Meanwhile, it is possible to significantly enhance the artistic impact on the viewer and to expand the capabilities of sound film, if you send the sound to the viewer not only from the screen, but also from any other place in the showroom or even from several places at the same time.

The implementation of this method of demonstration greatly expands the framework that now limits the work of the scriptwriter and director because of the fixed location of the sound source in a cinema theater, condemn it, its sound cinema, as art, to the mechanical imitation of the theater's methods with its three-wall stage.

The purpose of the present invention in a cinema theater is to give a sound that an observer would perceive not as a direct sound, emanating from the screen, but as directed from different points of the hall (front, rear, right, left) according to the director's intention. the time of arrival of sound waves to the observer from different directions from four reproducers located relatively to the observer eccentric.

The joint operation of these four loudspeakers is organized in such a way that at each moment three of these loudspeakers transmit a cinema film with a delay of as long as the sound wave is required to travel the distance from the fourth loudspeaker of the pre-darter.

In the absence of a proper reverberation of the hall and the joint operation of several eccentrically located loudspeakers, the direction of sound is felt in the direction from which the first of the sound vibrations was received to the observer, and subsequent vibrations in other directions are perceived by the observer in the same way as the reverberation would be perceived. sound flowing from the properties of the surfaces bounding the hall.

The proposed method of playing movies intended for creating an impression of movement in the space of sounding bodies is carried out by means of the following device:

1. The showroom is muted to reduce reverberation to

very small value.

2. In the hall, rows of reproducers are placed evenly over the entire surface of the hall at regular intervals of the order of 1.5 to 3 meters.

3. Four sets of magnetic sound transmission devices of the “ino-film on steel tapes are installed.

4. On each steel tape, sound recorders are installed according to the number of loudspeakers of the loudspeakers in a given direction (front, rear, right, or left).

5. The pickups of each of the four systems transmit a sound by a loudspeaker in such a way that each successive loudspeaker replenishes the power loss of a direct wave from a number of loudspeakers, taken as the initial one-phase with the movement of this direct wave.

6. For the four systems of magnetic transmission, such initial direct electors are chosen: for the first system, a front transverse row of reproducers; for the second-posterior transverse row; for the third - the right longitudinal row,

7. Each speaker is associated with all four magnetic transmission systems.

8. On the film, in addition to a normal phonogram, there are four rows of lines of variable width or intensity, which, under the action of light transmitted through these lines to four photoresistances, control the sound power in four directions (front, rear, right and left).

9.This control is achieved by including photoresistors in the grid contours of the additional (sound guide) gain through a corresponding change in potentials on the grids of the gain-overwrite sound recording on steel tapes.

To implement the proposed method, a modified device can also be applied.

In relatively small halls, instead of the location of reproducers specified in Section 2 in rows above the surface of the hall, these reproducers can be placed at certain intervals

about 1.5–3 meters symmetrically on the four walls of the hall in the same plane.

At the same time, for the counting of pickups on the length of the steel tape in each of the four systems of magnetic sound rewriting, the starting point of the center line of the loudspeakers on the wall is chosen, and the pickups are arranged so that the loudspeakers transmit the sound vibrations out of phase for the time required the sound beam travels the distance from the start point to the loudspeaker associated with the pickup.

The method of magnetic transmission of sound to steel tapes may remain unchanged, but can also be replaced by the use instead of one or several sound-producing devices with the appropriate arrangement of their photocells with respect to the phonogram passed by them sequentially.

In the latter case, the lengths of the radiuses, the locations of the reproducers from the middle of the longest of the four walls of the showroom, are counted and the photo cells and photoresistances associated with the corresponding reproducers are located at distances proportional to the propagation time of the sound wave from the starting point to the reproducer. associated with this photocell.

In this way, one apparent wave direction is obtained, for example, from the front. To obtain four possible directions (front, rear, left, right), each of the loudspeakers is connected to four photocells, and the operation of this loudspeaker is set depending on the potentials on the grids of the additional (guiding sound) amplifiers mentioned in paragraph 9, controlled by the action of light on the photoresistances indicated in subsection 8.

As a way of reproducing sound films designed to create an impression of movement in the space of sounding bodies, it is proposed to control the arrival time to the observer of sound waves excited by several eccentrically located loudspeakers.

A diagram of the device for carrying out this method is shown in a schematic drawing, in which an F-film with a phonogram and the four stereo lines indicated in clause 8, illuminated | light bulb. The image of the phonogram is i designed on the photocell 7 of the audio reproducing device, and | images of stereo line-on photoresistance 5. ,,, S - ,,, 5.ь., .., S, r, controlling the potentials of the grids of the lamps, 2-1 /, 2j-j ;, 2-. additional (directing sound) amplifiers, the anodic circuits of which are associated with recording electromagnets.

The subject matter of the invention.

Claims (2)

1. A method of reproducing sound intended to create an illusion of movement in the space of sounding bodies by means of spatially located loudspeakers, a different tag that changes the phases of the current feeding the loudspeakers according to the pacnpgffl ieww sound time from the place where the sound body is fictitiously located before the speaker. 2. A device for carrying out the method according to claim 1, characterized in that, in addition to the photocell 7, the audio reproducing device on which the phonogram is designed from the film F four are used, the photoresistances Zl-, S-, j,,. the amplitudes of sound vibrations deposited on the film F and which serve to control the potentials of the grids of the lamps 2j. ,,, 2-, 2 + .Г, 2.g additional amplification, the anodic contours of which are connected to the recording electromagnets 3 ,,, 3-, 1, 5j.t, 5 -.C.