JPH0340918B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a light control device for use on a stage or in a studio.

BACKGROUND ART Referring to FIG. 6, for example, when an action is performed in which a fade from scene B to scene A overlaps from the middle to scene C, the level changes in the fade from scene B to scene A. If the channel group whose level is changed by the fade from scene B to scene C were independent, each channel would only have to fade toward the level of either scene A or scene C. The problem arises when there is a channel where the level of either fade changes. In this case, if the fade to scene C starts in the middle of the fade of scene A, it is natural to fade from the level at that point to the level of scene C. If scene B to scene C
If a fade is performed from scene B to scene A, the channel group whose level was halfway through the fade from scene B to scene A will discontinuously change to the level of scene B, and then fade to scene C will be performed. It turns out. In other words, when a fade lighting effect is being performed in which the brightness gradually changes, the brightness will suddenly change.
It is unnatural and not desirable in terms of lighting effects.

The fade operation for creating a natural fade is as follows:
It is necessary to do this while calculating intermediate levels. The progress value of the first fade is FA, the progress value of the subsequent fade is FB, and the levels of each scene are Bi, Ai, Ci.
Then, the output level Oi is determined by the following complicated calculation formula: Oi = Bi + FA (Ai - Bi) + FB [Ci - {Bi + FA (Ai - Bi)}]...(1). When the number of channels is large, the number of calculation steps is large, so it is difficult to repeat calculations at high speed so as to obtain outputs that fade smoothly.

There was also a conventional example (Japanese Patent Application Laid-Open No. 1988-887) that performed the same operation using a different calculation method as follows. Its configuration is shown in FIG. This prior art calculates in advance the increment of the level of each channel per unit time before starting the fade, assuming that the progress of the fade changes constantly over time, and then adds the increment for each unit time when the fade starts. The structure is as follows.

That is, the fade calculation unit shown in this prior art includes a memory 1 that stores the illumination level Ai of the A scene, a memory 2 that stores the illumination level Bi of the B scene, and a memory 3 that stores the fade time T.
, an arithmetic section 4, a memory 5 that holds the dimming signal output Oi, an adding means 6 that adds the output from the memory 5 and the output from the arithmetic section 4, and this adding means 6.
and the memory 5.
It consists of SW. This changeover switch SW
When the initial value of the output Oi of the memory 5 is set, the common contact p1 is electrically connected to the individual contact q2, and at other times, the common contact p1 is electrically connected to the individual contact q1.
Assuming that the progress of the fade changes constantly over time, before starting the fade, the level increment per unit time of each channel is determined in advance, and the increment is added for each unit time as the fade starts.

With this method, there are no complicated operations including multiplication during the fade, so it is not only faster, but also when moving to another fade midway as described above, the increment is calculated from that point. The calculation is easy because all you have to do is fix it.

However, with this method, if the progress of the fade is not constant with respect to time, for example in the case of manual fade, the increment for each unit time must be calculated each time, so the output can quickly respond faithfully to the fader movement. It is difficult to do so.

Purpose The purpose of the present invention is to solve the above-mentioned technical problem,
To provide a light control device capable of naturally starting a new fade even from the middle of a fade.

Configuration The present invention provides a plurality of target first or second targets.
The first step stores each illumination level Ai, Ci of the scene.
A memory 22, a second memory 23, 23a that stores the illumination level Bi of the current scene, and a target first scene from the current scene.
And by performing operations for a crossfade that transitions from the current scene to the target first scene and then to the target second scene, the initial value is 0 and the final value is 1.
Fade operating means 20, 21, 24 for deriving a signal representing the progress value F of the fade, and the stored contents of the first and second memories 22; 23, 23a and the fade operating means 20, 21, 2.
In response to the signal from the calculation means 25, a calculation means 25 derives a signal representing the calculation result Oi expressed by the calculation formula Oi = Bi + F (Ai - Bi); A dimming signal output means 26 for giving a dimming signal to the light units u1 to un such that the illumination level becomes the calculation result Oi.
While cross-fading from the current scene to the first scene that should be the target, the second scene that should be the target
means 27, 50-52 for instructing that a crossfade should be performed on the scene; storing the calculation result Oi from the calculation means 25 at the point in time instructed by the instruction means 27, 50-52 in the second memory 23, 23a; Second goal
Store the scene illumination level Ci in the first memory 22, set the stored contents of the first memory 22 as the target scene illumination level Ai in the arithmetic expression,
The calculation means 25 calculates the stored contents of the second memories 23, 23a as the illumination level Bi of the current scene in the calculation formula, and the fade operation means 2
This is a light control device characterized in that it includes means 28 for controlling so that a crossfade of 0, 21, and 24 is performed.

Embodiment FIG. 1 is a block diagram showing the basic configuration of a light control device 19 of the present invention. The first control unit 20 controls the illumination level Ai of the scene A after fading, which is the target scene of each channel, and the illumination level Ai of the current scene. A certain first scene B
The illumination level Bi and the fade progress value F (starts from 0 and ends at 1) are provided to the first, second, and third memories 22, 23, and 24, respectively. The outputs of the memories 22, 23, and 24 are input to a fade calculation unit 25, which is a calculation means, and the second equation is calculated, and the calculation result Oi is output.

Oi=Bi+F(Ai-Bi) (2) The control section 20 sequentially performs this calculation for each channel and outputs the result to the dimming signal output 26 which outputs the dimming signal to the dimming units u1 to un. The dimming signal output 26 holds the calculation result Oi.

When starting a new fade from the middle of a fade, change the common contact p1 of the switching circuit 27 to an individual contact.
q1 and the output Oi at that time is stored in the memory 23.
and store the new scene C level in the memory 22.
Ci is stored, and the initial value when the fade progresses is stored in the memory 24. By doing this, the state in the middle of the fade from scene B to scene A is taken as the starting scene, and the fade to scene C is controlled by the second control unit 2.
It is carried out under the control of 8.

FIG. 2 shows the fade calculation section 25 in FIG.
FIG. 2 is a block diagram showing a specific configuration related to the above.
The address signal from the first control unit 20 is applied from the address output terminal AD to each address input terminal AD of the memories 22, 23, and 26a via switching circuits 50, 51, and 52. Further, the upper bits of the address of the first control section 20 are given to the decoder 53, and a write control signal from the first control section 20 is given to the decoder 53 from the output terminal ST. The write control signal is also decoded, and the decoder 53
The output from the first, second and third memories 22, 2
3 and 24, respectively, and is also applied to the read terminal OE of the memory 26a. Further, the dimming data from the first control section 20 is transmitted to the data output terminal of the first control section 20.
From DT to the first, second and third memories 22,2
Data No. 3 and 24 are applied to the input terminal DI, respectively, and to the input terminal D0 of the memory 26a. Common contacts of switching circuits 50 and 51
When p1 is electrically connected to individual contact q2, level data Ai of the A scene is stored in the memory 22, and B
The level data Bi of the scene is written to the memory 23.
Also, zero is written into the memory 24 as a fade progress value. After that, the common contact of switching circuits 50, 51, 52
p1 and the individual contact q1 are electrically connected, whereby the output of the control section 28 is applied to the address input terminal AD of the memories 22, 23, and 26a. The output of the control unit 28 changes one after another as a signal specifying channels, and accordingly, the fade operation result Oi for each channel is output, and at the same time, it is applied to the memory 26a as a data input DI, and a write control input signal WE is applied. Therefore, Oi is stored in the memory 26a. In this way, the calculation is repeated for each channel, but as the fade progresses, the control section 20 rewrites the memory 24, so the output Oi changes one after another.

When moving from the middle of a fade to another C scene,
Common contact p1 and individual contact q1 of switching circuits 50 to 52
When Oi is conductive from the dimming output section 26
is read and written into the memory 23, the level Ci of the C scene is written into the memory 22, and the fade progression value is changed from zero again.

FIG. 3 is a block diagram showing the structure of another embodiment of the memory 24 and the control section 28. memory 2
4 consists of a rate generator and counter 3
0, an oscillator 31 that provides a clock signal to the counter 30, and a comparator circuit 32 that compares the count output of the counter 30 with a fade time input signal T. In the comparator circuit 32, when the output of the counter 30 and the fade time input signal T match, a high level signal is derived to the counter circuit 28a and the counter 30 is reset.

In this way, the output of the comparison circuit 32 has a period proportional to the value of T. The output pulse of this rate generator 24 is applied to the counter circuit 28a.
When the signal is applied to the counter 34 via the AND gate 33, the counter 34 performs a counting operation, and when its output reaches the upper limit value, the NAND gate 35 detects this and prohibits the clock to the counter 34. When starting a fade, a reset signal ST is applied to the counter 34, and fade time data T is also applied. By doing this, the output F of the counter 34 changes linearly over the time T from zero to the upper limit.

In this circuit, by applying new fade time data T and reset signal ST while F has not reached the upper limit, it is possible to smoothly create a new fade in parallel even from the middle of the fade without any discomfort. .

FIG. 4 is a block diagram showing the structure of another embodiment of the fade calculation section 25. In this embodiment, the memory 26a is not required and the configuration is simplified. In this embodiment, addresses are given to the memories 22 and 23 for the control section 20 to read the output Oi, and the fade operation circuit output calculated using the outputs Ai, Bi from these and the fade progress value F at that time is calculated. It is read as it is through the buffer 60.

FIG. 5 is a block diagram showing the structure of still another embodiment of the fade calculation section 25. In this embodiment, the output Oi is always written in another memory 23a as in the embodiment shown in the second figure, but in this case, the data is not transferred to the memory 23 when switching to the next fade. , memory 23,2
3a is used by switching. Initially, the switching circuits 71 to 73 have their common contact p1 electrically connected to the individual contact q1, and the memories 22, 23, 24
The result of the calculation is written into the memory 23a. When switching the fade, data C of a new scene is set in the memory 22, the fade progress value is returned to zero, and at the same time the switching circuits 71 to 73 are switched so that the common contact p1 is electrically connected to the individual contact q2. As a result, a calculation is performed to fade from level B, which has been output until now, to level Ci, and the output will be written to the memory 23 from now on. In this way, the memory 23,
23a are used alternately one after another.

Effects As described above, according to the present invention, it is possible to quickly start a new fade even from the middle of one fade, so it is possible to perform dimming effects by fade control smoothly and naturally without any discomfort. Moreover, such a fade can be realized with a simple circuit configuration.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of a light control device 19 of the present invention, FIG. 2 is a block diagram showing a specific configuration related to the fade calculation section 25 in FIG. 1, and FIG. 4 is a block diagram showing the configuration of another embodiment of the fade calculation unit 25, and FIG. 5 is a block diagram showing the configuration of another embodiment of the fade calculation unit 25. FIG. 6 is a graph showing the level change when a new fade is performed in the middle of a fade, and FIG. 7 is a block diagram showing the structure of the prior art. 19... Light control device, 20... First control section, 21... Operation section, 22... First memory, 23... Second memory, 2
4, 26a...Memory, 25...Fade calculation section, 2
6... Dimming signal output section, 28... Second control section, 50,
51, 52, 71, 72, 73... switching circuit, 53
...Decoder, 60...Buffer, u1~un...Dimmer unit.

Claims (1)

[Claims] 1. A first memory 2 that stores each illumination level Ai, Ci of a plurality of first or second scenes to be targeted.
2, a second memory 23, 23a that stores the illumination level Bi of the current scene;
And by performing operations for a crossfade that transitions from the current scene to the target first scene and then to the target second scene, the initial value is 0 and the final value is 1.
Fade operating means 20, 21, 24 for deriving a signal representing the progress value F of the fade, and the stored contents of the first and second memories 22; 23, 23a and the fade operating means 20, 21, 2.
In response to the signal from the calculation means 25, a calculation means 25 derives a signal representing the calculation result Oi expressed by the calculation formula Oi = Bi + F (Ai - Bi); A dimming signal output means 26 for giving a dimming signal to the light units u1 to un such that the illumination level becomes the calculation result Oi.
While cross-fading from the current scene to the first scene that should be the target, the second scene that should be the target
means 27, 50-52 for instructing that a crossfade should be performed on the scene; and storing the calculation result Oi from the calculation means 25 at the time point instructed by the instruction means 27, 50-52 in the second memory 23, 23a; Second goal
Store the illumination level Ci of the scene in the first memory 22, set the stored contents of the first memory 22 as the illumination level Ai of the scene to be targeted in the arithmetic expression,
The calculation means 25 calculates the stored contents of the second memories 23, 23a as the illumination level Bi of the current scene in the calculation formula, and the fade operation means 2
2. A light control device comprising: means 28 for controlling a crossfade to be performed by 0, 21, and 24.