WO2010075776A1

WO2010075776A1 - Power amplifier equipment based on dmx protocol

Info

Publication number: WO2010075776A1
Application number: PCT/CN2009/076216
Authority: WO
Inventors: 张湋杨
Original assignee: 嘉力时灯光设备(东莞)有限公司
Priority date: 2008-12-31
Filing date: 2009-12-29
Publication date: 2010-07-08

Abstract

A power amplifier equipment based on DMX protocol includes an audio input interface, a volume control circuit connected to the audio input interface, a power amplifier circuit and an audio output interface connected to the power amplifier circuit. The said volume control circuit includes the DMX signal reception processing circuit and the electronic volume circuit. The said power amplifier equipment supports the DMX protocol, which is controlled by using DMX signals, so that the power amplifier equipment and digital lighting equipment can cooperate under the control of DMX signals to achieve the integrating control of sound and light for performance scene.

Description

A power amplifier device based on DMX protocol

The present invention relates to a power amplifier device, and in particular to a power amplifier device based on the DMX protocol.

Background technology

Power amplifiers, known as "amplifiers", are used in various performances in the current generation of the society, such as square evenings, individual concerts, and theaters. As shown in Figure 1, the power amplifier is a common audio amplification device. The basic circuit structure is a volume control circuit and a power amplifier circuit. The input audio signal is first input to the power amplifier circuit through the volume control circuit, and the power amplifier circuit will After the audio signal is power amplified, the audio signal is output to a sound device such as a speaker. Nowadays, the common power amplifier is to use the volume adjustment knob set on the panel of the power amplifier device, or use the volume adjustment button of the remote controller to adjust the volume; the input audio source, for example, may be from multiple digits respectively. The host's microphone (Mic), multiple CD players, etc., need to manually complete the audio input switching operation; if in a very large performance occasion, often multiple power amplifier devices are used at the same time, the performance The adjustments before the start and the control after the start of the performance will be a professional work with great labor intensity and considerable skill.

DMX is the abbreviation of Digital Multiplex, translated into Chinese as "Digital Multiplex Protocol", originally defined by "American Theatre Technology Society (USITT)" (DMX-512 protocol), followed by "Entertainment Services and Technology Association (ESTA)""Revised to the DMX-512A protocol and the RDM protocol, which has been recognized and complied with by manufacturers of stage lighting equipment in the world. A widely used digital lighting control protocol. That is to say, every controlled light unit in the link can achieve digital lighting control as long as it meets the requirements of this protocol.

The DMX-512 or DMX-512A control signals are in "frames" and can drive up to 512 light circuits per frame, also known as 512 DMX channels in the industry. The effective DMX value for each DMX channel is between 0 and 255. This feature of DMX allows people to achieve linear dimming of the lighting circuit by adjusting the DMX dimming value. For example, the LED lighting equipment that is more and more commonly used now has the basic structure of the circuit shown in Figure 2. The LED light can be changed according to the input DMX control signal. The DMX controller is a continuous device that sends DMX control signals to controlled lighting equipment. In this way, the stage lighting designer can edit the lighting control program of each performance scene for a pre-design of a performance, that is, a segment of the DMX control signal, and then store it in each DMX controller; after the performance starts, only need to start the corresponding The DMX controllers of the various performance scenes, the lighting equipment will be on the stage according to the pre-designed lighting changes, with minimal manual operation. This method of lighting control of the scenes using the DMX protocol has greatly reduced the labor intensity and operational skill requirements of the stage lighting staff, and has become more and more popular.

As we all know, in various performances or exhibitions in modern society, "sound" and "light" are usually used at the same time, so that they can match the performance scene and achieve a more advanced performance. As mentioned above, the operation control of the existing conventional power amplifier equipment is manually completed; and the increasingly popular stage lighting control method is automatically controlled by an electronic device such as a DMX controller using the DMX protocol. In this way, in a performance scene that requires the coordination of lighting and sound effects, how to achieve the same lighting and sound effects will be a difficult task to coordinate. Summary of the invention

The object of the present invention is to solve the problem that the power amplifier device and the digital lighting device in the prior art do not work well together, and provide a support for the DMX protocol, and can use the DMX letter. The power amplifier device controlled by the number, that is, a power amplifier device based on the DMX protocol.

A power amplifier device based on the DMX protocol of the present invention is implemented as follows:

A power amplifier device based on the DMX protocol, comprising an audio input interface, a volume control circuit connected to the audio input interface, a power amplifier circuit, and an audio output interface connected to the power amplifier circuit, wherein the volume control circuit comprises The DMX signal receiving processing circuit and the electronic volume circuit.

In a preferred embodiment, the DMX signal receiving processing circuit includes a DMX signal input interface, an RS485 transceiver and a microprocessor circuit; and the electronic volume circuit is a digital potentiometer circuit connected to the microprocessor circuit.

In a preferred embodiment, the DMX protocol-based power amplifier device further includes a multiplexer connected to the microprocessor circuit, and the audio input interface is connected to the multiplexer Audio signals are input to the digital potentiometer circuit by the multiplex separator.

In a preferred embodiment, the DMX protocol-based power amplifier device further includes one or more video input interfaces connected to the multiplexer, and a video output interface.

In a preferred embodiment, the power amplifier device based on the DMX protocol further includes a relay switch circuit, the relay switch circuit is connected between the power source and the power amplifier device, and the coil of the relay switch and the micro processing The circuits are connected.

In a preferred embodiment, the DMX protocol-based power amplifier device further includes an LED driving circuit and one or more LED illuminators connected to the LED driving circuit; the LED driving circuit and the microprocessor circuit are connection.

In a preferred embodiment, the power amplifier device based on the DMX protocol further includes one or more DMX controller circuits, and the DMX signal output interface of the DMX controller circuit is connected to the DMX signal input interface of the power amplifier. The play switch of the DMX controller circuit is disposed on the control panel of the power amplifier. Preferably, between the relay switch circuit and the microprocessor circuit, between the LED drive circuit and the microprocessor circuit, the power amplifier circuit and the digital potentiometer circuit Between the video input interface and the multiplexer, a current detecting module is connected between the audio input interface and the multiplexer; the current detecting The module detects the current in the circuit, and the current signal is processed by the microprocessor circuit and fed back to the display of the DMX controller.

In a preferred embodiment, a temperature detecting module is disposed in the vicinity of the LED driving circuit and in the vicinity of the power amplifier circuit; the temperature detecting module detects a temperature in the vicinity of the LED driving circuit and the power amplifier circuit, and the temperature signal is received by the microprocessor. After the circuit is processed, it is fed back to the display of the DMX controller. The DMX protocol-based power amplifier device embodying the present invention can use the DMX signal to control the power amplifier device, thereby enabling the power amplifier device and the digital light device to work together under the control of the DMX signal to realize the integrated sound and light control of the scene. At the same time, the multiplexer is used to realize the selection of the input source of the DMX signal. The relay switch circuit is used to realize the power control of the DMX signal to the power amplifier device of the present invention; the DMX controller circuit is added. Further integration of the operational control of the apparatus of the present invention is achieved. DRAWINGS

1 is a schematic diagram showing the basic circuit configuration of a conventional power amplifier device;

2 is a schematic diagram of a basic structure of an existing LED lighting device circuit supporting the DMX protocol; FIG. 3 is a schematic diagram of a circuit structure of the power amplifier device of the present invention;

4 is a schematic diagram showing the circuit structure of a power amplifier device according to a preferred embodiment of the present invention; FIG. 5 is a schematic diagram showing the circuit structure of a power amplifier device according to another preferred embodiment of the present invention; FIG. 6 is a schematic diagram showing the operation principle of the DMX control signal of the present invention;

7 is a schematic circuit diagram of a power amplifier device according to still another preferred embodiment of the present invention; FIG. 8 is a schematic diagram showing the circuit structure of a power amplifier device according to still another preferred embodiment of the present invention. detailed description

Hereinafter, the DMX protocol-based power amplifier device of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

As shown in FIG. 3, the power amplifier device based on the DMX protocol of the present invention comprises an audio input interface, a power amplifier circuit and an audio output interface; a volume control circuit disposed between the audio input interface and the power amplifier circuit (as shown in FIG. 3) The part of the dotted line box includes the DMX signal receiving processing circuit and the electronic volume circuit. Referring to FIG. 1 and FIG. 3, the power amplifier device of the present invention adopts a DMX signal receiving processing circuit and an electronic volume circuit instead of the conventional volume control circuit of FIG. 1, so that the power amplifier device of the present invention can support the DMX protocol. You can use the DMX signal to adjust the volume; this changes the way you need to use the volume adjustment knob set on the panel of the amplifier device or use the volume adjustment button of the remote control to complete the volume adjustment, so that the DMX signal can be used to control the stage. Sound and light equipment is possible.

In a preferred embodiment of the present invention, the DMX signal receiving processing circuit, as shown in FIG. 3, includes a DMX signal input interface, an RS485 transceiver, and a microprocessor circuit; and the electronic volume circuit is A digital potentiometer circuit (Electronic Volume) to which the processor circuit is connected. The RS485 transceiver here can be a circuit including the SNAS176 serial data processing chip of TEXAS INSTRUMENTS; the microprocessor circuit here can be a signal processing circuit including ATMEL's ATMEGA8L-8AI chip; The circuit can be an electronic volume adjustment circuit including the MESS45AFP chip of RENESAS.

In another preferred embodiment of the present invention, as shown in FIG. 4, the DMX protocol-based power amplifier apparatus of the present invention further includes a multiplexer (Multiplexer/Demulitiplexer) connected to the microprocessor circuit. After the one or more audio input interfaces are connected to the multiplexer, the multiplexer inputs the audio signal to The digital potentiometer circuit. The multiplexer here can be a circuit that includes the 74HC4052 chip of PHILIPS. In this way, the multiplexer will select different audio input interfaces as the audio input source of the power amplifier device according to the instruction of the DMX control signal under the control of the microprocessor circuit, and through the aforementioned electronic volume adjustment and power. Zooming in, and finally outputting it to the audio output interface of the power amplifier device of the present invention, and the audio input source described here may be a microphone (Mic) from a plurality of hosts, a plurality of CD players, and the like. In other words, the power amplifier device of the present invention, the selection of the audio input source can be automatically completed by the pre-designed and edited DMX control signal, and the audio input switching operation does not need to be manually performed during the performance.

In still another preferred embodiment of the present invention, as shown in FIG. 4, the DMX protocol-based power amplifier apparatus of the present invention further includes one or more video input interfaces connected to the multiplex separator. Obviously, the principle of the video input interface here is similar to the above audio input interface. The multiplexer will select different video input interfaces as the invention under the control of the microprocessor circuit according to the instruction of the DMX control signal. The video input source of the power amplifier device, and outputs the video signal to the video output interface. The video input source described here may be a VCD player or a DVD player for playing background video, or it may be a current show video recorded in real time. In other words, the power amplifier device of the present invention, the selection of its video input source can be automatically completed by the pre-designed and edited DMX control signal, and the video input switching operation is not required to be performed manually during the performance.

According to still another preferred embodiment of the present invention, as shown in FIG. 4, the DMX protocol-based power amplifier device of the present invention further includes a relay switch circuit, and the relay switch circuit is connected between the power source and the power amplifier device. The coil of the relay switch is coupled to the microprocessor circuit. Thus, the power supply of the power amplifier device of the present invention can be controlled using the DMX signal.

According to still another preferred embodiment of the present invention, as shown in FIG. 5, the DMX protocol-based power amplifier apparatus of the present invention further includes an LED driving circuit and one or more LED illuminators connected to the LED driving circuit. The LED illuminator here can be like a background Various LED digital lighting equipment as described in the technical section. As shown in FIG. 5, the LED driving circuit is connected to the microprocessor circuit. Please refer to FIG. 2 and FIG. 5 in comparison. FIG. 5 also completely includes all the circuit components in FIG. 2, and the LED illuminator in FIG. 5 is also operated under the control of the DMX control signal as in FIG. 2; In other words, in the preferred embodiment, the input DMX control signal is used to control both the aforementioned audio volume, multiple audio or video input selections, and the LED digital lighting device. In this way, the stage lighting designer, the stage sound designer and the stage background designer can work together for a certain performance, pre-design and edit the lighting, sound effects and background control program of each performance scene, that is, a DMX control signal, and then Stored in the DMX controller; after the show starts, just start the DMX controller, lighting equipment, sound equipment and video equipment will be designed according to the pre-design, the sound, light and image changes on the stage, greatly reduced Staff strength and operational skills requirements.

The various DMX control signals described above can be edited by defining a DMX channel data as a light control signal, an audio or video input source control signal, a volume control signal, etc., as shown in FIG. It can be a DMX signal. Obviously, as described in the background section, since the DMX control signal is in "frame" units, each frame of data contains 512 DMX channel values, SP: (1) DMX-512 protocol or DMX-512A protocol is provided There are 512 control signal types that can be defined, and (2) the DMX signal values of the 512 signal types are included in each frame of data, so that the 512 defined controlled devices can be driven simultaneously. Therefore, as shown in FIG. 6 and the above description: (A) The present invention can define the value of DMX channel 1 as the power switch control signal, and further defines that when the value of DMX is between 0-127, the power is turned off. . The stage designer can edit a frame of "DMX channel 1 with a value of 0" at the end of a DMX signal segment that combines the light control signal, the volume control signal, and the audio and video control signal to achieve the preferred embodiment described above. The purpose of controlling the power supply of the power amplifier apparatus of the present invention using the DMX signal, that is, when the performance ends, the power input of the apparatus of the present invention is turned off, A shutdown operation is implemented. (B) The present invention can define the value of the DMX channel 2 as the control signal selected for the input interface. Parallel definition: When the value of DMX is between 0-63, it is to turn on the control signal of the microphone (Mic) audio input interface; when the value of DMX is between 64-127, it is to turn on the laser disc player ( CD) The control signal of the audio input interface; when the value of DMX is between 128 and 191, it is the control signal for turning on the video input interface of the VCD machine; when the value of DMX is between 192 and 255, the DVD player is turned on. Control signal for the video input interface. The stage designer can edit the DMX signals for a performance, corresponding to different performance scenes and different time periods, such as "DMX channel 2 value is 0", "DMX channel 2 value is 64", The data of "DMX channel 2 has a value of 128" or the like, thereby realizing the selection of the audio (or video) input source of the power amplifier device of the present invention in the foregoing preferred embodiment, which can be automatically controlled by a pre-designed and edited DMX control signal. Completion, the purpose of the switching operation of the audio (or video) input is not required to be performed manually during the performance. For the definition of (C), the value of DMX channel 3 is the volume control signal, and the value of (D) defines the value of DMX channel 4 as the light control signal, etc., since its principle is similar to the introduction of (A) and (B) above. I will not repeat them here. Obviously, if in a very large-scale performance occasion, when multiple power amplifier devices of the invention are used at the same time, the method of unified control by using DMX signals will greatly reduce the labor intensity and operation skills of the stage staff. Claim.

According to still another preferred embodiment of the present invention, as shown in FIG. 7, the DMX protocol-based power amplifier device of the present invention further includes one or more DMX controller circuits, and the DMX signal output interface of the DMX controller circuit. Connected to the DMX signal input interface of the power amplifier. The DMX controller circuit is an industry-leading technology; it is integrated into the power amplifier device of the present invention, so that the power amplifier device of the present invention can operate independently without an external DMX controller, and the stage designer can complete a design for editing. After the DMX control signal of a certain performance, it is recorded in the DMX controller in the device of the present invention. If the device of the present invention integrates multiple DMX controller circuits, and these DMX controls The play switch of the circuit, that is, the button for starting the transmission of the DMX control signal, is set on the control panel of the power amplifier of the present invention, and the stage designer can design an independent multi-stage DMX control signal for different time periods or different programs of a certain performance. Then, each segment of the DMX control signal is separately recorded into a plurality of DMX controllers of the device of the present invention; after the performance starts, the stage controller can press the play button according to the corresponding time period or the corresponding program to issue the aforementioned light, volume, The control signal of the audio or video, thus, the device of the present invention becomes a full-featured central control device for the stage scene.

In still another preferred embodiment of the present invention, as shown in FIG. 8, between the relay switch circuit and the microprocessor circuit, between the LED drive circuit and the microprocessor circuit Between the power amplifier circuit and the digital potentiometer circuit, between the video input interface and the multiplexer, at the audio input interface and the multiplexer A current detecting module is connected to each other; the current detecting module detects a current in the circuit, and the current signal is processed by the microprocessor circuit and fed back to the display screen of the DMX controller. Or, further, as shown in FIG. 8, a temperature detecting module is disposed in the vicinity of the LED driving circuit and in the vicinity of the power amplifier circuit; the temperature detecting module detects a temperature in the vicinity of the LED driving circuit and the power amplifier circuit, The temperature signal is processed by the microprocessor circuit and fed back to the display of the DMX controller. In the foregoing two preferred embodiments, the DMX-512A protocol or the RDM protocol for transmitting signals bidirectionally is used; after the current signal or the temperature signal is fed back to the display screen, the stage worker can monitor the working condition of the device. Reference, further enhances the ease of use of the apparatus of the present invention. In summary, the several embodiments described above do not represent all the implementations of the present invention; the above embodiments are not specifically limited to the present invention, and all configurations similar to the technical solutions of the present invention should fall within the scope of protection of the present invention. .

Claims

Claim

1. A power amplifier device based on the DMX protocol, comprising an audio input interface, a volume control circuit connected to the audio input interface, a power amplifier circuit, and an audio output interface connected to the power amplifier circuit, wherein the volume control The circuit includes a DMX signal receiving processing circuit and an electronic volume circuit.

2. The power amplifier device according to claim 1, wherein the DMX signal receiving and processing circuit comprises a DMX signal input interface, an RS485 transceiver and a microprocessor circuit; and the electronic volume circuit is coupled to the microprocessor A digital potentiometer circuit connected to the circuit.

3. The power amplifier apparatus according to claim 2, wherein the power amplifier apparatus further includes a multiplex separator connected to the microprocessor circuit, the audio input interface and the multiplexer After the multiplexer is connected, an audio signal is input to the digital potentiometer circuit by the multiplexer.

4. A power amplifier apparatus according to claim 3, wherein said power amplifier apparatus further comprises one or more video input interfaces coupled to said multiplex separator, and a video output interface.

The power amplifier device according to claim 2 or 3 or 4, wherein the power amplifier device further includes a relay switch circuit, and the relay switch circuit is connected between the power source and the power amplifier device. The coil of the relay switch is coupled to the microprocessor circuit.

The power amplifier device according to claim 5, wherein the power amplifier device further includes an LED driving circuit, and one or more LED illuminators connected to the LED driving circuit; the LED driving circuit and The microprocessor circuits are connected.

The power amplifier device according to claim 6, wherein the power amplifier device further includes one or more DMX controller circuits, and the DMX signal output interface of the DMX controller circuit and the DMX of the power amplifier The signal input interfaces are connected, and the play switch of the DMX controller circuit is disposed on the control panel of the power amplifier.

8. The power amplifier apparatus according to claim 7, wherein between said relay switch circuit and said microprocessor circuit, between said LED drive circuit and said microprocessor circuit Between the power amplifier circuit and the digital potentiometer circuit, between the video input interface and the multiplexer, between the audio input interface and the multiplexer, A current detecting module is connected to each other; the current detecting module detects a current in the circuit, and the current signal is processed by the microprocessor circuit and fed back to the display screen of the DMX controller.

The power amplifier device according to claim 7 or 8, wherein a temperature detecting module is disposed in the vicinity of the LED driving circuit and in the vicinity of the power amplifier circuit; and the temperature detecting module detects the LED driving circuit and the power amplifier The temperature near the circuit, which is processed by the microprocessor circuit, is fed back to the display of the DMX controller.