JPH08203675A - Modulated light data communicating method, and light modulating device therefor - Google Patents

Abstract

PURPOSE: To reduce the erroneous receipt of a data even under an environment with much noise, and minimize a bad effect by treating the differential data of level of a fader as a modulated light data for communication. CONSTITUTION: The level voltage of a fader 10 is sampled 11, and converted 12 into an 8-bit illuminance data. A differential data forming part 14 generates a differential data between this illuminance data and the previous illuminance data on the basis of the illuminance data. A serial data receiving part 20 receives the differential data, converts it into a parallel data, and transmits the resulting data to an error detecting correcting part 22. The correcting part 22 transmits the differential data to an adding part 23 after a prescribed treatment, and the adding part 23 performs the addition of the differential data, and transmits a new modulated light data to a control part 21. The control part 21 successively supplies a load current to a stage luminaire 3 on the basis of the modulated light data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light control device for performing load control while transmitting data for light control from a light control console to a light control panel as serial data.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a light control device used for stage lighting or the like, and FIG. 4 is an explanatory view showing a data format for communication from a light control console to a light control panel. As shown in FIG. 3, the light control device includes a light control console 1 and a light control panel 2.
With. The dimming console 1 is a part where the operator performs dimming operations while watching the stage. The dimming control panel 2 is a part that supplies a load current that has been subjected to phase control and pulse width control (PWM) to the stage lighting fixture 3 such as an incandescent lamp or a fluorescent lamp. The dimming console 1 and the dimming control panel 2 are installed separately from each other and are connected to each other via a transmission line L which is a dimming data communication line.

The dimming console 1 comprises a fader 10, a sampling section 11, an A / D conversion section 12, and a serial data transmission section 13. The fader 10 is a portion that the operator operates while watching the stage, and outputs a level voltage according to the position of the fader 10 that is operated. The sampling unit 11 sequentially samples the level voltage output by the fader 10 at a constant sampling frequency. The A / D conversion unit 12 sequentially converts the sampling value output from the sampling unit 11 into 8-bit illuminance data (D7, ... D0) that is a digital value of “0” to “255”. The serial data transmitting unit 13 has a 1-bit start bit (ST1) having a logical value "0" at the beginning.
, 8-bit illuminance data (D7, ... D0) output from the A / D converter 12, and 2-bit stop bits (SP1, SP2) having a logical value “0” are connected. This is sequentially output to the transmission line L sequentially from the start bit as one cycle of serial data as shown in FIG.

The dimming control panel 2 includes a serial data receiving section 2
0 and a load control unit 21. After detecting the start bit output from the serial data transmission unit 13 via the transmission line L, the serial data reception unit 20
When D7 of the illuminance data is sequentially received from D0, and finally both of the two stop bits have the logical value "0", the received D7, ... D0 is converted into the illuminance data of the parallel data and the load controller It outputs to 21. Based on the illuminance data (D7, ... D0) from the serial data receiving unit 20, the load control unit 21 determines that the illuminance data is “0” when the illuminance data is “0”. For example, a load current that provides 100% illuminance is supplied to the stage lighting device 3.

By the way, the transmission line L may be laid adjacent to a power cable for supplying a load current for lighting the stage lighting device 3 which has been subjected to phase control and pulse width control (PWM). , Exposed to a lot of electrical noise. Therefore, the laying environment of the transmission line L can never be said to be good,
Often, the dimming data received by the serial data receiving unit 20 becomes erroneous dimming data that is different from the original dimming data, and the stage lighting fixture 3 has an abnormal light and shade different from the operator's operation. Changes can occur.

Therefore, in the conventional light control device, in order to improve the noise resistance of the serial data receiving section, each bit is sampled at a plurality of timings and the majority of the sampled data is taken to determine each bit. To determine the received data (for example, Japanese Patent Laid-Open No. 57-
No. 53169), or in order to improve noise resistance against periodic noise, a method of setting the sampling timing at irregular intervals (for example, see Japanese Patent Laid-Open No. 5-233338) is being studied. .

[0007]

However, although the serial data receiving section of the conventional light control device as described above has the effect of reducing the probability of erroneous reception of light control data due to noise, erroneous reception is completely eliminated. However, especially when the content of serial data is set as the control value of the lighting of the stage lighting fixture, a control value output that is significantly different from the control value intended by the operator is generated, which may cause a serious failure. There was a point.

The present invention has been made in order to solve the above problems, and an object thereof is to reduce the erroneous reception of data even in an environment with a lot of noise, and to prevent the erroneous reception of data. An object of the present invention is to provide a dimmer having excellent noise resistance, which can minimize the noise.

[0009]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an invention as set forth in claim 1, wherein the difference data of the fader level is converted from a dimming operator console to a dimming control panel. It is a method characterized by including as dimming data to be communicated to.

Further, according to the present invention, a sampling unit for sequentially sampling the fader level, a difference data creating unit for successively calculating the difference between the sampling values, and an error correction code added to the difference data. And an error correction code addition unit for converting the error correction code difference data into a differential data, and a serial data transmission unit for sequentially transmitting the error correction code difference data and a serial data from the light control console. The serial data receiving unit, the error detection and correction unit that corrects if there is a communication error in the received data based on the error correction code, and the difference data from the error detection and correction unit is added to the previous dimming data and new dimming data is added. And a load control unit that controls the illuminance based on the dimming data output from the difference data adding unit, and It is characterized in that it has configured to include.

[0011]

With the above-described structure, the invention of claim 1 handles the difference (change) in the fader level as dimming data for communication, so that the sampling frequency can be set sufficiently high. For example, the quantization accuracy can be maintained even if the number of data bits (quantization bit number) of the dimming data communicated in one cycle is reduced.

According to another aspect of the present invention, the light control console converts the digital data of only the difference (change amount) of the fader level into serial data and transmits the serial data to the light control panel as the light control data. Just do it. Therefore, if the sampling frequency of the sampling section is set sufficiently high with respect to the operation speed of the fader, the difference (change) in the fader level can be made sufficiently small, and this sufficiently small difference (change) can be set to the absolute value of the fader level. If the value is quantized with the same degree of quantization accuracy as that when the value is quantized, a much smaller number of data bits (quantization bit number) will suffice.

That is, as the dimming data transmitted from the dimming operator console to the dimming control panel, if the difference (change amount) in the fader level is handled and the sampling frequency is set sufficiently high, the number of data bits (quantization bit number) ) Does not lower the quantization accuracy, so even if several bits of the conventional data bits are used for error correction code at the time of communication error, the same accuracy as the conventional quantization accuracy is obtained. Can be secured, and error correction can be performed on it.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The light control device according to the present invention will be described in detail below with reference to FIGS. 1 and 2. FIG. 1 is a block diagram showing a light control device, and FIG. 2 is an explanatory diagram showing a data format for communication. In FIGS. 1 and 2, the same parts as those described in the related art are designated by the same reference numerals, and detailed description of the same parts will be omitted.

The dimming device shown in FIG. 1 is different from the conventional dimming device in that the dimming console 1 is provided with a differential data producing section 14 and an error correction code adding section 15, The optical control board 2 is provided with an error detection / correction unit 22 and a difference data addition unit 23.

The light control device configured as described above operates as follows. That is, the fader 10 outputs the level voltage according to the operation position of the operator. The sampling unit 11 uses the fader 10 at a constant sampling frequency.
The level voltage output by is sequentially sampled. A /
The D conversion unit 12 sequentially converts the 8-bit illuminance data, which is a digital value of “0” to “255”, according to the sampling value of the level voltage of the fader 10 sampled by the sampling unit 11. The difference data production unit 14
Based on the 8-bit illuminance data sequentially output from the A / D converter 12, difference data between the present illuminance data and the previous illuminance data is calculated and sequentially output.

If the change in the level voltage output from the fader 10 is not so sharp and the sampling frequency of the sampling unit 11 is sufficiently high, the difference data output from the difference data producing unit 14 is 8 bits of illuminance data. For short word length, for example 6 bits ("-32")
~ 64 levels of "+31"). These 6 bits are made to correspond to D7, ... D2. Further, the positive / negative representation may be a general two's complement, and MSB represents a positive / negative sign.

The error correction code adding section 15 adds 2-bit error correction codes (D1, D0) corresponding to 6-bit difference data (D7, ... D2) to the LSB side to form 8-bit data. The 2-bit error correction code may be added to the MSB side of the 6-bit difference data. The serial data transmission unit 13 converts the 8-bit parallel data to which the error correction code (D1, D0) has been added into serial data, and a start bit (ST1) having a 1-bit length having a logical value "0" at the head. , And then the difference data (D7, ... D
2), then the error correction code (D1, D0), and then the stop bit (SP) of 2 bit length which is the logical value "0".
1, SP2) are connected to each other, and sequentially output from the start bit to the transmission line L as one cycle of serial data as shown in FIG.

The serial data receiving unit 20 detects the start bit output from the serial data transmitting unit 13 via the transmission line L, and then sequentially receives the difference data D7 to D2 and the correction codes D1 and D0. Then, finally, if both stop bits 2 bits SP1 and SP2 have a logical value of "0", the received serial data of D7, ..., D0 is converted into parallel data and sequentially output to the error detection / correction unit 22. To do.

The error detection / correction unit 22 uses the difference data (D
7, ... D2) and the error correction code (D1, D0) are compared, if there is no error, if there is an error, the correction according to the correction code (D1, D0) is added, and then the difference data Are sequentially output to the difference data addition unit 23. The differential data addition unit 23 sequentially adds the differential data output from the error detection / correction unit 22 and sequentially outputs new dimming data obtained by the sequential addition to the load control unit 21. And
Based on the dimming data sequentially output by the difference data adding unit 23, the load control unit 21 sets the load current such that the illuminance becomes 0% when the illuminance data is “0”, and the illuminance data is “25”.
In the case of "5", a load current such that the illuminance is 100% is sequentially supplied to the stage lighting fixture 3.

The present invention is not limited to the above embodiment, and the difference data may be obtained by converting the fader level into a digital value and then calculating the difference, or at the analog value stage. It goes without saying that the difference as an analog value may be obtained and the difference as an analog value may be converted into a digital value to obtain.

[0022]

Since the present invention is configured as described above, in the invention of claim 1, the difference (change) in the fader level is treated as dimming data for communication. If the sampling frequency is set sufficiently high, it is possible to prevent the quantization accuracy from deteriorating even if the number of data bits (quantization bit number) of the dimming data communicated in one cycle is reduced. It is possible to provide an excellent dimming data communication method capable of maintaining the quantization accuracy of conventional dimming data even when a part of the data bits of the data is used as a data bit for an error correction code. Has the effect.

According to the second aspect of the invention, a part of the data bits of the dimming data for conventional communication is
By using it as a data bit for an error correction code, error correction is possible even if erroneous reception should occur due to noise, etc., and even if erroneous reception occurs, adverse effects can be minimized and noise resistance is improved. It is possible to provide an excellent light control device.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a light control device according to the present invention.

FIG. 2 is an explanatory diagram showing a data format for communication in the above embodiment.

FIG. 3 is a block diagram showing a conventional light control device.

FIG. 4 is an explanatory diagram showing a data format for communication of a conventional light control device.

[Explanation of symbols]

 1 Dimming control console 2 Dimming control panel 10 Fader 11 Sampling unit 13 Serial data transmitting unit 14 Difference data creating unit 15 Error correction code adding unit 20 Serial data receiving unit 21 Load control unit 22 Error detection and correction unit 23 Difference data adding unit

Claims (2)

[Claims] 1. A dimming data communication method, characterized in that, as dimming data for communication from a dimming console to a dimming control panel, fader level difference data is included. 2. A sampling unit that sequentially samples the fader level, a difference data creation unit that sequentially calculates the difference between sampling values, and an error correction that adds an error correction code to the difference data to make difference data with an error correction code. A dimming console including a code adding unit and a serial data transmitting unit that sequentially transmits differential data with error correction code, a serial data receiving unit that receives serial data from the dimming console, and a communication error in the received data. If there is, an error detection and correction unit that corrects based on the error correction code, a difference data addition unit that adds the difference data from the error detection and correction unit to the previous dimming data and outputs as new dimming data, and the difference data A dimming control panel including a load control unit that controls the illuminance based on the dimming data output from the adding unit. Light equipment.