JPH02157741A - Synchronized operation system - Google Patents

Abstract

PURPOSE:To perform a synchronized operation between systems by simultaneously inputting feature extracting data of plural pieces of sound information or picture information and comparing the data with each other. CONSTITUTION:The output signal of a 2nd preamplifier 7b is inputted to a 2nd sound recognizing device 8b which extracts the feature of sound information from an audio tape recorder 6. Signals on the sound track of a movie film are reproduced by means of an optical reading device incorporated in a cineprojector 5 and inputted to a 1st sound recognizing device 8a which extracts the feature of sound information from the sound track after the signals are amplified by means of a 1st amplifier 7a. Feature extracting data 9a and 9b which are respectively the output signals of the 1st and 2nd sound recognizing device 8a and 8b are inputted to a synchronizer 10 and the reproducing seed of the audio tape recorder 6 is controlled by outputting a control signal 11 so that the data 9a and 9b can be made coincident with each other in time. Thus the cineprojector 5 and audio tape recorder 6 can be synchronized to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a projector for projecting a motion picture film and its sound using a separate and independent audio tape record without utilizing the soundtrack of film E. This relates to a synchronized operation method for a projection system for playback.

[Prior Art] Movie sound is optically recorded on a soundtrack (2) on a movie film (1) shown in FIG. 3 by applying AM modulation as shown in FIG. 4.

However, since the width of this soundtrack (2) is narrow, its resolution is limited, and the dynamic range of the audio cannot be wide enough, and the running fluctuations of the movie film (1) are large, resulting in deterioration of sound quality. The problem was that it was not possible to provide a sufficiently satisfactory sound. As a way to solve this problem, there is a projection system that uses a high-performance audio tape record to reproduce the sound part and operates the audio tape record while synchronizing with the image of the film to provide high quality sound. SMPT is generally used to synchronize operation of a projection system consisting of a projector and an audio tape recorder.
E-time code (its format is shown in Figure 5) is used in this projection system, which records the same time code on the movie film and magnetic tape, and records the same time code on the movie film and the magnetic tape. Synchronous operation is performed so that the content of the above time code always matches the content of the time code on the magnetic tape reproduced from the audio tape record. The time code is recorded optically on the movie film on the time code track (3) in Figure 3, and the same content as the film is recorded on the audio tape record on a dedicated time code track (not shown). The time code is recorded.

[Problems to be Solved by the Invention] In the conventional projection system as described above, which is composed of a projector and an audio TV record, a time code is used for synchronized operation.

As the time code recording area on the movie film is located at the edge of the movie film, as shown in time code track (3) in Figure 3, it is easily damaged and the reliability of the reproduced time code is shortened.

In the worst case scenario, there was a problem that the synchronized operation of the projection system would be lost.

This invention was made to solve this problem, and in order to ensure synchronized operation of the projection system without any problems, a system synchronization method different from the method using time code is adopted to achieve more stable system synchronization. The purpose is to obtain a synchronous operation system that can perform the following steps.

[Means for Solving the Problems] A synchronous operation system according to the present invention is a system that simultaneously reproduces the same audio information or image information from a plurality of reproduction devices, wherein the output section of the plurality of reproduction devices a plurality of feature extraction means for extracting features of said audio information or image information from said plurality of feature extraction means; and a synchronizer for simultaneously inputting and comparing feature extraction data of said plurality of audio information or image information extracted by said plurality of feature extraction means. It is equipped with the following.

[Operation] In this invention, the synchronizer controls the playback speed of a plurality of playback devices so that the phase or time code content of each feature extraction data coincides in time.

[Embodiment] FIG. 1 is a block diagram showing the configuration of a projection system according to an embodiment of the present invention. In fig.

(5) is a movie projector, and (6) is an audio tape record.

(7a) is a first preamplifier whose input side is connected to the projector (5); (7b) is a second preamplifier whose input side is connected to the audio tape record (6);
(8a) is a first speech recognition device whose input side is connected to the first preamplifier (7a); (8b) is a second speech recognition device whose input side is connected to the second preamplifier (7b); The device 110) is a synchronizer whose input side is connected to the first and second speech recognition devices (8a), (8b) and whose output side is connected to the audio tape record (6); side is connected to the second preamplifier (7b), and its output side is connected to the speaker group (13)
A power amplifier (14) is connected to a screen that projects images from a projector (5).

In the projection system configured as described above, a movie image is projected onto the screen (14) from the projector (5). On the other hand, the audio is an audio tape record (6)
The audio signal recorded on the magnetic tape is played back,
Second preamplifier (7b) and power amplifier (12)
is reproduced from the speaker group (13). First and second audio to synchronize video and audio! W recognition device (
8a), (8b) and a synchronizer (10). Since the soundtrack of a movie film and the magnetic tape have the same audio information recorded, the output signal of the second preamplifier (7b) is input to the second audio recognition device (8b), where the audio The characteristics of the audio information from the tape record (6) are extracted, and the signal on the soundtrack of the movie film is reproduced by an optical reader (not shown) built into the projector (5), and the first preamplifier ( 7a) and inputs the output signal to a first speech recognition device (8a), which performs feature extraction of the speech information from the soundtrack. The respective feature extraction data (9a), (9b), which are the output signals of 8b), are input to a synchronizer (10). A synchronizer (10) compares the extracted data (9b) and feature extracted data (9a) of audio information from the soundtrack, and outputs a control signal (11) so that they coincide in time, Controls the playback speed of the audio tape record (6) and the projector (5)
This realizes synchronized operation of the audio tape record (6).

Note that in the above embodiment, features of audio information from the soundtrack and audio information from the audio tape record (6) are extracted to realize synchronized operation of the system, but a time code may also be used in combination. In this case, as shown in FIG. 2, a new first time code reader (15a) is installed.
and a second time code reader (15b),
The time code signal from the movie film (16a) and the time code signal from the audio tape record (6) (
16b) is input to the synchronizer (10), and the system is operated in synchronization using two systems of signals: the audio information feature extraction data and the time code.1 The reliability of the system can be further improved.

In addition, although the above embodiment describes synchronization between a projector and an audio tape record, the present invention can be applied to a system in which audio information or image information with the same content is played back in synchronization on multiple devices. By adopting this method, features of audio information or image information can be extracted for synchronized operation.

[Effects of the Invention 1] As not explained above, the present invention is a system for simultaneously reproducing the same audio information or image information from a plurality of reproduction devices, and a system for simultaneously reproducing the same audio information or image information from a plurality of reproduction devices. simultaneously inputting a plurality of feature extraction means for extracting the features of the audio information or image information from the output part of i, and feature extraction data of the plurality of audio information or image information extracted by the plurality of feature extraction means; Since it is equipped with a synchronizer for comparison, synchronized operation between systems is performed using feature extraction data of audio information, which increases the reliability of the system and makes it possible to accurately match the phase of the sound. be. Further, by using it in combination with a time code signal, there is an effect that the reliability of the system can be further improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a projection system according to one embodiment of the invention, FIG. 2 is a block diagram of a projection system according to another embodiment of the invention, FIGS. 3 and 4 are diagrams of the format of a motion picture film, and FIG. Figure 5 is an SMPTE time code format diagram. In the figure, (5)...Movie projector, (6)...Audio tape record, (8a), (8b)...Speech recognition device, (1,0)...Synchronizer, <15a). (15b)...A time code reader. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A system for simultaneously reproducing the same audio information or image information from a plurality of reproduction devices, the system comprising: a plurality of feature extraction means for extracting characteristics of the audio information or image information from output units of the plurality of reproduction devices; Then, the feature extraction data of the plurality of audio information or image information extracted by the plurality of feature extraction means, or the feature extraction data and the plurality of time codes from the output parts of the plurality of playback devices are simultaneously input and compared. and a synchronizer that controls the playback speed of the plurality of playback devices so that the phase of each feature extraction data or the content of the time code coincides in time. driving system.