Design of multimedia voting system

2019-01-21 11:03:05 admin

A modern multi-functional multimedia conference room is the integration of audio and video AV systems.It is composed of conference system, multimedia audio and video signal source, large screen system, sound amplification system, audio and video switching, audio and video acquisition and conference control system.Through the conference central control system, all conference equipment, audio and video equipment, signal switching, light switch and shade, screen lifting, volume adjustment and other functions in the conference room are controlled, making the operation of the conference simplified and improving efficiency.

With the rapid development of science and technology, digital information technology is constantly applied in intelligent multimedia conference room. Modern intelligent multimedia conference room has made great progress in the application of digital conference system, wireless conference system, digital audio processing and hd large-screen display.The application of digital control and digital processing technology in AV system makes the application of central control system in multimedia intelligent conference system easier and more convenient.

1. Multimedia system design function

Multimedia intelligent conference system in general has the following functions, according to the actual needs of the meeting site to choose the required function collocation.

High quality conference sound reinforcement system to ensure voice and music quality

Digital conference system, including conference speech, voting and simultaneous interpretation

Convenient and reasonable multimedia socket, can easily call the data

Audio and video sources can be arbitrary switching

Projection system for large screen display

Remote video conference system can hold remote video conference

Multimedia conference audio and video recording system

Central control system for centralized control management

2. System design scheme

The multimedia intelligent conference system realizes the seamless connection between the digital conference system and the conference central control system, and integrates multiple subsystems including the conference discussion system, simultaneous interpretation system, voting and voting conference system, video tracking conference system, sound amplification system, multimedia video system and network video conference system.Under the control of wireless touch screen, the above subsystems and the whole conference environment are organically combined into a whole through the conference central control system, realizing the intelligent management of the conference.

2.1 conference central control system

As the soul of intelligent multimedia conference room system design, the central control system integrates lighting, air conditioning, projection, mechanical and audio and video control means, providing users with simple and direct control interface, enabling users to easily grasp the state and function of all devices in the entire space environment.

Here we take haotian scs-wifi101 conference central control system to introduce how the conference central control system realizes the intelligent management of multimedia intelligent conference system.Haotian scs-wifi101 central centralized control system is composed of scs-wifi101m central control host, wireless color touch screen and various bus devices, including 8-channel power switch controller and volume regulator.Haotian scs-wifi101m central control host has 8 built-in infrared ports, 8 weak relay ports, 2 weak current I/0 ports and 16 two-way serial ports.

The core of the whole system is the central control mainframe of scs-wifi101m.It is connected with the control bus and each device, color touch screen to accept the control requirements issued by the controller, and then through a variety of control interface to extend the control equipment and control equipment issued control instructions, all control functions through the special system software programming, the specific control can be achieved through the color LCD touch screen.Its operation interface is intuitive and easy to understand according to the actual requirements of users

Control function:

Through the IR port to control the operation of all kinds of audio source equipment (such as play, stop and other simple functions and equipment Settings and other advanced adjustment);

Through the RS232 port of various professional matrix and related equipment control, complete all kinds of audio/video/computer signal switching, adjust the signal path;

Volume control can be completed through the bus device volume controller or digital audio processor through the RS232 port;

The incandescent lamps in the conference center can be shunted and stepless dimmed through the dimming module, or the daylight lamp set can be switched and controlled through the power switch module;

Through the relay controller, to complete the control of the electric curtain, electric screen and system equipment power management control;

Central control equipment can be designed according to different needs procedures, such as a variety of meeting mode, lighting mode, system management mode, password protection access, etc., with the actual use of on-site adjustment.According to the user's specific needs, the preparation of linked operation procedures, only one instruction can be completed multiple actions.

Through the RS232 or RS485 interface, the use of camera cradle, the realization of the meeting room camera zoom and all-round rotation, camera video signal through audio and video matrix switcher to switch output to the display device.

2.2 conference sound reinforcement system

The acoustic amplification effect of the intelligent multimedia conference room must meet the national standard of acoustic characteristics for the design of sound amplification system.The national hall sound amplification system acoustic characteristic index has the detailed index standard on the hall sound amplification most loud pressure level, sound field uniformity, frequency response, sound transmission gain, sound energy reflection ratio and so on parameter, satisfies these index standards is the conference room sound amplification foundation.Each meeting room basically has its own sound defects, which we need to adjust and compensate through audio processing equipment.

The sound amplification system design usually starts from the sound field design, because the sound field design is meets the system function and the sound effect foundation, involves the speaker system's choice, the sound supply plan and the signal way and so on, is the very complex tedious work.Due to the rapid development of computer technology, special acoustic software tools can be used to calculate the sound field design to meet the expected requirements.After the speaker system is determined, the driving power of the power amplifier can be calculated and the driving signal path can be determined.Then according to the drive power distribution scheme to further determine the signal processing scheme and audio processor selection.

The sound amplification system of the multimedia intelligent conference room mainly consists of three parts: sound source, audio processing equipment, power amplifier and speaker system.Traditionally, audio processing equipment is composed of mixer and multiple audio processing equipment, while modern audio processing equipment is the digital audio processor which has gradually emerged in recent years.

Composition of sound amplifying equipment for multimedia intelligent conference room:

Audio source: mainly including conference microphone and recording and playback card holder, DVD player multimedia computer and other audio source equipment, can play tape, CD, DVD audio and video images, recording and playback card holder and recording equipment can also be high quality recording of the meeting. 

Conference audio processing equipment: it is the core equipment in the conference sound amplification, can carry out multi-channel audio signal mixed amplification, switching, high and low frequency adjustment, effect compensation control, volume adjustment, recording, playback use; 

Power amplifier and speaker: the sound quality and sound field uniformity of the whole sound amplification system mainly depends on the quality and layout of the speaker.Different types of speakers require different amplifiers.

Cardiac digital audio processor in the smart meeting room become widely available, it combines the traditional amplification of mixer, equalizer, pressure limit device, the noise gate, frequency divider, AGC automatic gain control, decelerator, feedback suppressor audio processing functions in an organic whole, through a computer can be very convenient for audio signal processing and adjustment, can increase or decrease in each amplification channel audio processing module, its powerful digital processing and control function can also be seamless connection and intelligent centralized control system,Centralized control system can be realized and the digital audio processor with audio channel switch, the increase or decrease in the volume gain, conference audio mode switch and so on all functions, completely unable to get rid of the intelligent centralized control system of the conventional mixer and audio processing equipment control, really realize the centralized management of the smart multimedia conference system and centralized control.For example, for a conference hall of 200 square meters, we only need to configure a 16 in 16 out scs-m160 digital audio processor, a st-pg450 professional power amplifier, two st-es250 speakers, an i-tech 4x3500HD four-channel power amplifier, and eight AVI AL200 high-power ceiling speakers to achieve the sound amplifiers of this lecture hall.Through the central centralized control system, the sound amplification system can also be managed to achieve intelligent control.

2.3 digital intelligent conference system

Digital intelligent conference system includes hand in hand conference system, voting system and simultaneous interpretation system.In the development of modern conference, the emergence of digital conference and wireless conference system makes modern conference step forward to multi-function and convenient use.

Digital conference system and not only is the difference between the traditional digital conference system, the application of digital control technology to the meeting and the digital transmission technology and digital audio processing technology, perfect integration into the conference system, make the meeting system not only has a discussion and visual tracking, IC card attendance, a vote, with 6 road, and other functions, and in man-machine communication meeting system, conference system, conference system, conference system run speed, sound quality meeting system capacity and system transmission cost ascended to a new height.

Wireless digital conference system has become an important developing direction in recent years because of its advantages such as easy to install and move, easy to use and maintain.At present, there are two wireless conference systems, one is the wireless conference system based on 2.4g wireless digital frequency hopping technology, and the other is the infrared wireless conference system based on infrared audio transmission technology.Due to the development of modern digital technology, both the disadvantages of the infrared wireless conference system based on 2.4g, such as easy interference and eavesdropping, and poor sound quality, and the disadvantages of the infrared wireless conference system based on the infrared audio transmission technology, have been greatly improved.And the domestic quality is more and more stable, has replaced the trend of imported products, the price reduction also makes the infrared wireless conference has been widely used.

2.3.1 digital conference presentation and discussion system

       
   2.3.3 simultaneous interpretation system

The simultaneous interpretation conference system is used for international conference communication.In the process of meeting the participants who use multiple languages together, when the participants who use any one language speak, the simultaneous interpreter will immediately translate them into other languages and send them to each participant through the language distribution system, so that they can choose the language they understand and achieve the purpose of multi-language communication.

In multimedia conferences, simultaneous interpretation is usually used in combination with the conference presentation and discussion system.If you want to configure system with the function, has the conference delegates speech unit we can choose to have meetings with the channel selector unit, and to the unit is not equipped with conference delegates separate configuration with our channel selector, channel selector can be wired access throughout the conference system, infrared language distribution system is used to access.

Here we use haotian scs-930 with channel selection for simultaneous interpretation system:

Scs-930 infrared language distribution system host unit:High-fidelity circuit design, ensure the quality of signal transmission with the perfect transformation of, with functions of automatic level control (ALC), anti-interference ability, can prevent malicious interference, using 1.7 MHz - 4 MHz transmission frequency, from high frequency light source and interference, the anti-interference circuit design of the wireless communication equipment, ensure the language channel between each other and to eliminate the interference of mobile phones and other electronic equipment, adopt advanced phase-locked loop technology, guarantee the stability of host transmitting frequency, the system can send 6 channels of voice signal, at the same time with six-way audio input port, with two lines of high frequency signal output interface (BNC interface x2),Each channel can be connected to multiple infrared transmitting units, the number is not limited.With six audio output ports, it can be connected to external recording equipment for meeting minutes, with one translation unit input port, it can be connected to multiple translation units.

Scs-930r infrared language distribution system receiving unit: ultra-wide Angle design, wide signal receiving range;With "channel" button, six language channels, with high sound quality earphone, users can freely choose the listening channel according to their own needs;High fidelity circuit design, no noise and noise, with high signal-to-noise ratio and speech clarity;Anti-interference design, to ensure that each channel to receive non-interference, and can prevent interference of mobile phones and other electronic devices;Within the effective signal coverage range, the number of receiving units is unlimited;The effective range of infrared emission and the position of receiving unit can be moved at will

Scs-930i translation unit: one translation platform can translate one target language, simultaneous simultaneous interpretation of 12 languages (including acoustic channel);The infrared language distribution system is connected hand in hand, which can be connected to 11 translation stations at the same time;It can be used by two translators at the same time.Two people can listen to different source languages and then translate into the same target language.With channel busy detection to ensure the uniqueness of channel use;The utility model has a wave-wheel input channel selection and a touch-tone output channel selection;It has the function of eliminating cough. When the interpreter coughs, the microphone can be temporarily turned off to prevent the sound of cough from reaching the venue.With an indirect translation switch (RELAY), in case the translator does not understand the speaker's language, he/she can listen to other translators' translations and carry out a second translation.The SLOW button can remind the speaker to SLOW down when he speaks too fast.Whether it's a traditional digital conference system, or a full digital conference system, they connect all the microphones in the system in series with a single wire connection technology, and finally to the conference host, as if hand in hand.In the communication of medium and large group meetings, there are many speakers in the meeting. The technology of single line connection can ensure that everyone can speak easily and at the same time facilitate the management of the meeting.Digital conference from the installation comes with embedded and desktop, from the function of pure speech, speech with voting, speech with voting with simultaneous transmission.We illustrate the system composition with the haotian digital scs-630 series.

Haotian scs-690 voting and signing conference system, scs-630 is an intelligent multi-functional digital conference system, the system USES audio and digital control technology, set voting, signing, video tracking, discussion function as one.System built-in software, through the CPU editing program, highly restore the audio design, the original sound quality restoration.Built-in audio filter function to control the microphone audio.The system can be independent detection system, with a variety of speech mode, powerful function, make it into a solution to the technical requirements of the ideal product, the system is easy to install, easy to operate

Haotian scs-690 voting conference system is composed of conference host, chairman unit and representative unit. The system composition and functions are as follows:

Conference host scs-690m: can be set up a variety of speech mode, can be set up fifo, automatic shutdown, timing shutdown and other exit mode;Multi-function sign-in, voting, video tracking meeting system functions;Built-in IC card reader with IC card check-in function;With approval, opposition, abstention, five choose one, five choose three and other voting functions;It has time-limited closing mode and automatic closing mode to meet various needs;Built-in video switcher, can access 4 cameras at the same time;

Chairman unit scs-690c: chairman unit has priority to have the right to speak, control the right to speak;Each system can set up the chairman unit at most;Microphone with LCD screen and multi-function button, according to the display content, menu Settings, voting, sign-in function and other operations, the operation process is simple and intuitive.Support more than one chairman unit, connection without location restrictions can be arbitrarily installed, with priority key, can control the atmosphere of the meeting.

Representative unit scs-690d: it has functions of applying for speeches, queuing for speeches and listening to speeches;Microphone with LCD screen and multi-function button, according to the display content, menu Settings, voting, sign-in function and other operations, the operation process is simple and intuitive; 

 

Meeting management software scs-690s: with basic Settings Settings module, can include startup, system Settings, sound regulation, work mode, line detection, conference information and other functional Settings;With the venue design module, according to the actual venue layout to design a visual control interface;The personnel file module can archive the information and materials of the participants.With the microphone control module, the operator can realize the centralized control of the whole meeting process;IC card management module, with the smart IC card, you can pre-set the participants' identity, authority, language and other information;Information display module, can display conference logo, speaker information, application speaker information, channel allocation, both information, short messages, etc.;Meeting recording module, with the corresponding equipment to achieve the meeting recording video.

2.3.2 digital conference system with voting

Multimedia intelligent conference room voting function, we can have a variety of ways to achieve.If each representative has a speech unit, we can choose the meeting unit with voting function on the speech unit to realize the voting function.If only part of the delegates are equipped with speech unit, we can configure wireless voting voting device for the delegates without speech unit.Here we take haotian digital conference unit scs-690c /D with voting function, can be directly used:

Conference host scs-630m: can set a variety of speech mode, can set fifo, automatic shutdown, timing shutdown and other exit mode;Multi-function sign-in, voting, video tracking meeting system functions;Built-in IC card reader with IC card check-in function;With approval, opposition, abstention, five choose one, five choose three and other voting functions;It has time-limited closing mode and automatic closing mode to meet various needs;Built-in video switcher, can access 4 cameras at the same time;

Chairman unit scs-690c: chairman unit has priority to have the right to speak, control the right to speak;Each system can set up the chairman unit at most;Microphone with LCD screen and multi-function button, according to the display content, menu Settings, voting, sign-in function and other operations, the operation process is simple and intuitive.Support more than one chairman unit, connection without location restrictions can be arbitrarily installed, with priority key, can control the atmosphere of the meeting.

Representative unit scs-690d: it has functions of applying for speeches, queuing for speeches and listening to speeches;Microphone with LCD screen and multi-function button, according to the display content, menu Settings, voting, sign-in function and other operations, the operation process is simple and intuitive;

Wireless voting voting device scs-w830t: let the participants without the configuration of the meeting unit used for keypad check-in or IC card check-in, voting and voting, with LCD display, can display the bidding vote results on the voting device;

Conference voting host scs-w830m: the voting host can be used independently, also can cooperate with the central control host, to achieve the voting work of the delegates from signing to all kinds of conference proposals.

Information display: used to display the agenda, representatives and background information of the meeting, voting results and other information;The data display can be large-screen projector, dedicated display, or LCD display on the voting device. Haotian conference voting device has built-in LCD display in each voting unit, so we can read the voting result conveniently from the LCD display.

IC card check-in: IC card can be used to confirm the identity of the representative, the check-in before voting.

Meeting management software scs-690s: with basic Settings Settings module, can include startup, system Settings, sound regulation, work mode, line detection, conference information and other functional Settings;With the venue design module, according to the actual venue layout to design a visual control interface;The personnel file module can archive the information and materials of the participants.With the microphone control module, the operator can realize the centralized control of the whole meeting process;Agenda management module, including signing, voting, election, scoring and discussion of a variety of agenda management;IC card management module, with the smart IC card, you can pre-set the participants' identity, authority, language and other information;Video management module, can simultaneously link 4 cameras, monitor the meeting scene;Information display module, can display conference logo, speaker information, application speaker information, channel allocation, both information, short messages, etc.;Meeting recording module, with the corresponding equipment to achieve the meeting recording video.

Scs-930t infrared language distribution system transmission unit: high-fidelity circuit design, to ensure the sound quality of the perfect conversion transmission;With power regulation function, customers can choose 15W or 25W power according to the venue area requirements;With automatic protection circuit device, can prevent the launch unit temperature is too high;Automatically start up or shut down the machine synchronously with the host machine;The same infrared transmitting unit is used for multiple channels.The transmitting units are connected hand in hand, which is convenient for construction.Direction bracket (adjustable Angle) is available for fixed installation

Scs-930p charging host: 1U chassis design, simple operation;With a 40-way charging interface, it can be connected to 40 infrared transmitting units for charging at a time.

2.4 video tracking meeting system

Video tracking conference system can provide high quality video image signal resource for conference.It can be activated through the digital speech system, in the unmanned operation of the speaker accurately and quickly close-up.The collected signals can be output to the large screen back projection system and remote video conference system.

Generally speaking, video tracking conference system requires several high-speed hemispherical cameras installed vertically on the top of the conference table, whose main function is to collect close-ups of speakers.A fixed panoramic camera is installed above the large screen of the conference room, which is used to capture the whole scene when no one is speaking.

Modern camera tracking system can be realized in two ways, one is to configure the device of the meeting system itself to realize the camera tracking function, and the other is to realize through the central centralized control system.The video tracking function of the conference system itself makes it convenient to set the preset position of the camera, and we can reset the microphone position as soon as it changes.However, the disadvantage of the camera tracking function through the central centralized control system is that it is not convenient to reset the device after the microphone position is changed.

Haotian scs-760 series conference system adopts a separate video tracking host. The video tracking host can set the camera preset position through the camera tracking host. No single configuration software is needed to facilitate equipment debugging and use.

2.5 multimedia video system

       With the development of computer technology, multimedia video system has become an indispensable part of modern conference system, its content mainly includes the projection system of the connected computer, the real object projection system, intelligent whiteboard, etc., to meet the needs of modern information exchange.Through it, the existing other signals, such as closed-circuit television, broadcast television and network television conference signals, can be fed into the multimedia conference system.Also can send the multimedia conference signal of each assembly hall to the network exit, carries on the network television conference exchange.

Video hd technology has been gradually applied in the modern multimedia conference system, hd technology in the modern multimedia intelligent conference system is now the collection of hd video signal and hd video signal display.Video hd signal acquisition is mainly by hd camera camera, hd storage equipment record;Video hd signal display is mainly by hd projector, hd LCD display and hd plasma display equipment play hd images.

Cardiac multimedia projector: professional multimedia projector has high brightness, high resolution, true color display function, not only can a video recorder, LD, DVD players, video image, but also on the big screen projection real computer graphical text information (or computer network), this function is particularly suited to introduce the project, the lecture teaching, etc.;

Physical display stand: high brightness physical display stand, can be any physical, lecture notes, slides after video transmission to the projector, projected on the big screen to show the audience; 

Cardiac electronic whiteboard: this device can be used in the lectures, laptop display content through the projector in the electronic whiteboard, and have the lecture easily in electronic whiteboard control computer directly to the demo, and for writing, mark, can save, can through the network meeting equipment long-distance meeting to discuss at the same time, is the modern multimedia conference system is necessary and effective communication tool.

2.6 remote video conference system

Remote video conference system USES communication lines to transmit the image and sound of participants in two or more meeting places in real time, as well as the images of meeting data charts and related objects, etc., so that participants in different places can hear and see each other, just like sitting in the same conference room.

At present, most remote video conference systems are based on IP network, which is generally composed of several multimedia conference terminals, IP network and multi-point control server.Conference terminal is a multimedia PC equipped with video acquisition equipment camera and codec card, audio input and output equipment microphone and speaker and terminal application program;Multipoint control server is a high performance server.A typical centralized multipoint conference is all terminal in a point-to-point manner to multipoint control server sends streaming video and audio stream and control flow, multipoint server will follow certain control protocol to centralized management of the meeting, for mixing and mixing and video signal switching, data distribution, and the results back to attend the meeting of the terminal.

2.7 recording and broadcasting system of the meeting

Conference recording and broadcasting system mainly has two aspects: one is recording, one is broadcasting.Recording is mainly reflected in the ability to record audio signals, compound video signals, VGA and other multimedia computer signals. Its rich signal input interface provides convenience for recording the multi-angle and multi-picture process of conference activities.Broadcast is mainly reflected in the fact that it can not only play the recorded meeting information on the spot, but also can conduct real-time live broadcast on the Internet, carry out Internet on-demand, remote management, post editing and other functions, and it is not limited by time and region.

3, knot theory

Compared with the traditional conference system, the intelligent conference system has significant advantages: the integrated design makes all the equipment in the conference room organically unified, which greatly enriches the function of the whole conference and significantly improves the efficiency.The LCD touch screen makes the operation of various devices easy and fast.