Simultaneous interpretation system design

2019-01-21 10:53:07 admin

How it works: language distribution is carried out by using infrared ray transmission, which is highly recommended for its super-strong confidentiality. It is the most advanced transmission mode in the current wireless simultaneous interpretation system in the market, and is suitable for all kinds of small, medium and large conference rooms and outdoor places with high requirements on confidentiality.The design of the system can simultaneously modulate and transmit up to six languages, participants only need to be equipped with a lightweight receiver, through the selection of channels can listen to the content of the speech. 

 

I. important terms

Simultaneous interpretation, also known as simultaneous interpretation, as the name implies, refers to the basic synchronous language translation.The interpreter is responsible for the translation, and the simultaneous interpretation equipment only provides the interface for operation.In other words, when equipped with simultaneous interpretation equipment, the system composed of these equipment cannot perform automatic translation of the language and must be translated by interpreters. 

 

Ii. Simultaneous interpretation system

Haotian system is fully functional in providing simultaneous interpretation language allocation to conference participants, so it can meet the comprehensive requirements of large multilingual international conferences.In the design of the interpretation function, the overall design idea of the system is also implemented: the cable used to transmit the digital distribution signal of the interpretation language is exactly the same as the cable used for other functions.Therefore, it is relatively easy to add interpretation into the original SETTUNE system. 

Simultaneous interpretation system can choose the working mode of direct translation from the original language, or can choose the second translation mode, to facilitate the translation of unfamiliar languages.Each interpreter desk has an output in the original language and an output in other languages. 

Principles of simultaneous interpretation

During the talks between the representatives of A and B, when the representative of A speaks, the translator A translates his/her language into the language of b. the representative of B hears the translated content almost at the same time and responds in time. The translator B then translates his/her speech into the language of A.Similarly, the representative of country A heard the translated content almost simultaneously and replied in time. We simplified this process into A schematic diagram as shown in the figure.In such a translation process, it can be clearly seen that the time of the meeting is timely, because the electronic system is used for voice interpretation, exchange and allocation, and the time spent on the translation work is only related to the response speed of the translator. 

 

Iv. Transmission mode of simultaneous interpretation

The core technology of the simultaneous interpretation system is multilingual listening signal transmission (distribution, transmission and reception), which is mainly composed of wired and wireless solutions, and wireless transmission is divided into electromagnetic wave mode and infrared mode.

 

4.1 infrared transmission technology

Infrared transmission is widely used in the field of language distribution and transmission in simultaneous interpretation due to its advantages of simple installation, good sound quality and strong confidentiality.The simultaneous interpretation system using infrared transmission basically consists of the following equipment or subsystems. 

Signal source: pickup microphone, conference system and other audio sources

Interpreter station: also called interpreter console, it generally has duplex communication function and is connected with the control host of digital conference system to exchange audio and data. 

Infrared transmitting host: the electronic audio signal is sent to the infrared transmitting host through the audio cable, and is modulated and sent to the infrared transmitter. 

Infrared radiant panel: also known as infrared radiant panel, the modulated electronic audio signal is sent to the transmitter through the radio frequency cable, and the infrared transmitting tube is used to cover the entire conference room. 

Infrared receiver: in the coverage of infrared ray, all receivers can receive the infrared ray. The receiver changes the infrared light signal into an electric signal, and through the power amplification, carries on the multi-channel voice monitoring through the headset.

 

Basic functions of simultaneous interpretation

A complete simultaneous transmission system should have the following basic functions:

     

5.1 automatic transfer of on-site language function

When the live speech is in the same language as the interpreter, the interpreter who changes the language does not need to translate any more and can turn off the microphone of the interpreter for a short rest. At this time, the interpreter control host should be able to automatically switch the channel occupied by the interpreter into the live language. 

 

5.2 secondary or relay interpretation function

The interpreter should be able to receive all the voice including the native language (live language), translated language, multimedia signal source, etc. When the translator does not understand the live language, the system will automatically connect another set of translated language for the translator to carry out the second or relay translation. 

 

5.3 call and technical support functions

Each interpreter desk has an independent channel for the chairman and technicians to call for assistance such as speed and technical support without disturbing the other participants. 

 

5.4 interpretation channel locking function

To prevent different translation languages from occupying the same channel, the system should set the channel occupation indicator light. 

 

5.6 independent voice monitoring function

The interpreter control host can monitor each channel and field language, and has independent volume control function.

 

Vi. Design essentials of simultaneous interpretation

6.1 full access of signal sources

Simultaneous interpretation system in the core role is to conduct a variety of audio exchange, and at present due to the multimedia signal source is widely used in the meeting, so when the design should fully consider all the voice signal (the typical conference system, wireless microphone, etc.), multimedia signal source (a typical computer audio signal, VCR, tape recorders, CD players, cable television signals, etc.) as well as the most important emergency broadcast all access control host of simultaneous interpretation.Since most interpreting hosts only have 1-2 channels of extended audio input, audio matrix or mixer can be designed to preprocess the above multimedia audio signals before input to the simultaneous interpreting host. 

 

6.2 video source monitoring for interpreters

In the relevant provisions of ISO2603, it is recommended that the forum, the participants, the blackboard and the projection screen should all be in the translator's line of sight at the same time. 

• interpreters can observe the mouth movements, expressions and other body language of speakers at any time through the function of linkage of camera, so as to make the atmosphere of translation more vivid and rich; 

• interpreters can clearly identify the specific position of the speaker, timely understand the identity of the speaker and the representative position of the conversation, and clarify the special meaning of some languages; 

• interpreters can understand data, drawings, tables or other types of electronic data that the speaker explains on a blackboard, electronic whiteboard or projection screen in a timely manner to make the translation more accurate. 

But in most of the academic lecture hall, international banquet hall and other large conference applications, regardless of the interpretation room set in any location, this can be compatible with the requirements of many aspects is obviously not easy to achieve.So in the design can make full use of multimedia video system, the venue cameras, computers and other video signals sent to all the interpretation room for monitoring. 

 

6.3 video source format of the translation room

The current meeting room video source mainly composite video (such as camera, the simulation platform, video recorders, CD players, etc.) and RGB format (such as computer signals, digital display, etc.) is given priority to, the design can be installed in each room of a translation each one video monitor and data receiver, access systems respectively SETTUNE video matrix and haotian RGB matrix.In order to reduce the use of translation room space, simplify interpretation room wiring system, especially to avoid long distance transport of RGB signal attenuation, proposal design 1 multifunctional video frequency multiplication processors, put to the interpretation of video frequency doubling and RGB signal, and then unified to RGB format through SETTUNE twisted pair transceiver ring received each interpretation. 

 

6.4 number of infrared radiators designed

The installation quantity of infrared radiant panel shall be considered in the design under the following conditions:

• number of languages of interpretation

Most manufacturers have different definitions for the power description of radiant panel, but the common feature is that the power generated by transmitting different number of channels is different, which can be calculated by the following formula:

Radiation effective area = the most class coverage area/number of emission channels

• materials for site decoration

Infrared light is invisible, but it transmits properties similar to sound waves: a black, rough surface absorbs more infrared light than a white, smooth surface, in which case the number of infrared transmitters should be increased moderately. 

      

6.5 installation of infrared radiant panel

Since the infrared radiant panel has a specific radiation Angle, it is better to design with the architectural drawings of the venue, as far as possible to install it on the height of the building (such as the ceiling or ceiling), and then simulate the 1/2 power transmission Angle of the infrared radiant panel, so that the 1/2 power point can cover the maximum range.If the effective area of the building has a depression or a relatively large block, it is recommended to install an auxiliary transmitter board in the area to avoid the blind area of infrared coverage.

 

6.6 design suitable carrier frequency band

The rf signals of each channel have their own carrier frequency, which is concentrated around a certain frequency. This frequency is called the carrier frequency of the channel, and the highest and lowest value of the carrier frequency is called frequency deviation.The larger the frequency offset range of the rf signal, the higher the quality of the audio signal transmitted, and the fewer channels it can transmit. 

A. narrow-band modulation mode

Narrowband modulation adopts frequency offset sub-carrier frequency modulation mode of 6khz-7.5khz, which is widely used in multi-channel voice transmission system. The carrier frequency range is between 55khz-1335khz, with each channel increasing by 40KHz and frequency response range of 50hz-8khz. It can be transmitted by up to 32 standard narrow-frequency channels, and is suitable for high definition language transmission.The frequency response range of narrowband modulation is significantly lower than that of broadband transmission, but it is sufficient for voice transmission where the most important thing is the number of channels and the clarity of the language.

The narrow-band modulation mode is easily interfered by the high-frequency noise generated by the switching power supply. According to the type of high-frequency noise interference source, it can be divided into peak interference and harmonic interference, and interference coupling path can be divided into conduction interference and radiation interference.Narrowband modulation mode mainly vulnerable to high frequency harmonic radiation interference, interference sources most comes from all kinds of energy-saving lamps, indoor for energy-saving lamps in order to reduce flicker, using the mains switch power supply frequency ac 50 hz frequency up to 38 KHZ, it is easy to produce one or more of 38 KHZ signal harmonic, the harmonic frequency points may be just cover in narrowband modulation frequency range, even for 32 channels will produce harmonic interference, thus affect the signal-to-noise ratio of the infrared transmission system and launch distance. 

B. Broadband modulation mode

The wideband modulation mode adopts 22.5KHz frequency offset sub-carrier frequency modulation mode, and the carrier frequency range is between 2MHz and 6MHz. It is widely used in multi-channel high-pitch transmission system, and is suitable for high-quality simultaneous interpretation, language training, wireless tour guide, multi-channel movie, high-fidelity audio and other infrared transmission systems.Broadband modulation can distribute up to 32 subcarrier transmission bands at 200KHz frequency intervals. 

As the carrier frequency of 2.3mhz and 2.5mhz high frequency band has a strong anti-interference ability, the frequency response can be up to 20hz-20khz when using the frequency offset sub-carrier frequency modulation mode of 50KHz, which can be used for occasions with very high requirements on the audio quality.

 

6.7 cable balance for rf transmission

The cable balance of rf transmission mainly considers the following factors:

A. length of transmission cable

Although rf signals can be transmitted over hundreds of meters of cable, it is recommended that the first load of the modulator is preferably the nearest infrared radiant plate, and that the bus length of the entire rf cable link should be controlled within an effective transmission distance.In the same rf link, due to the inconsistent connection length between each infrared transmitter and the modulator, when there is a significant delay difference in the arrival time of signals from the two infrared radiators, the infrared signals in this area will have conflicts and cause some additional high-frequency noises.

The empirical value is that the connection cable length difference between two infrared radiators and the modulator should not be more than 30 meters.However, in the implementation process of the project, it is still inevitable that some special system wiring will appear. At present, some infrared radiation boards designed by manufacturers have built-in rf cable delay adjustment function. 

B. Transmission cable terminal

To facilitate system wiring, most infrared radiators have rf loop output ports.Whether one or more infrared radiators are used in a rf link, the last radiator in all links must be processed terminally to equalize the power distribution of rf signals across the link. 

Terminal impedance is given priority to with 50 Ω early, now there have been many 75 Ω terminal transmission impedance.Most infrared radiators are built-in terminal resistance, through the toggle switch to determine whether the infrared radiators need terminal processing, some new products have automatic terminal function. 

 

Vii. Selection of simultaneous interpretation products

The interpreter desk can be selected from 6 channels of different languages, plus the original language of the speech.Interpretation systems can work independently or as an integral part of a large integrated system.When used independently, the built-in microprocessor is programmed manually to control language channel allocation, channel routing, and interlocking.

The empirical value is that the connection cable length difference between two infrared radiators and the modulator should not be more than 30 meters.However, in the implementation process of the project, it is still inevitable that some special system wiring will appear. At present, some infrared radiation boards designed by manufacturers have built-in rf cable delay adjustment function. 

To facilitate system wiring, most infrared radiators have rf loop output ports.Whether one or more infrared radiators are used in a rf link, the last radiator in all links must be processed terminally to equalize the power distribution of rf signals across the link. 

Terminal impedance is given priority to with 50 Ω early, now there have been many 75 Ω terminal transmission impedance.Most infrared radiators are built-in terminal resistance, through the toggle switch to determine whether the infrared radiators need terminal processing, some new products have automatic terminal function.