Simultaneous Interpreting System

Simultaneous Interpreting System

Simultaneous interpreting system is designed for high-quality distribution of audio signal from an interpreter to each listener. The term “simultaneous interpretation” means that the sound of translation is received by the listener with a minimum delay, therefore, the interpreter translates almost on the fly. The listener does not have to wait until the speaker stops and the interpreter starts translating the phrase the speaker said. In fact, the delay will be no more than 1-2 words.

The modern system of simultaneous interpreting easily solves the task of translation into several languages, as far as interpreters work simultaneously in special booths without disturbing each other. The listener chooses the target language he/she understands on the receiver. The maximum number of target languages, for example, in the Bosch simultaneous interpreting system is 32 languages.

Синхронный перевод

Main components of the simultaneous interpreting system

The infrared receiver of a delegate is the main component of simultaneous interpreting system. The listener receives this receiver at the conference, connects headphones to it, selects the most comfortable translation channel for him/her to understand and adjusts the sound volume of the headphones. The better the IR receiver is, the better are the sound in the headphones and the listener's comfort. 


Producers of simultaneous interpreting systems 

The main producers of simultaneous interpreting systems include the following companies: 

Производители систем синхронного перевода

Each of these manufacturers has its own features, but German company Bosch possesses superiority in quality, reliability and design of the conference systems and simultaneous interpreting systems.

Using the example of Bosch simultaneous interpreting system, we will describe the principle of operation and component parts of the system.


Principle of operation of simultaneous interpreting system

Simultaneous interpreting system operates on the principle of wireless audio signal transmission, which is distributed in the room with the help of infrared emitters and received by the individual delegate receivers, to which the headphones are connected.

Infrared simultaneous interpreting system works using a range of 300 GHz – 429 THz in the spectrum of invisible infrared waves due to several reasons:

  • unloaded range in comparison with radio frequencies,
  • possibility to transmit 32 channels simultaneously,
  • protection against interference,
  • operates within the borders of one room and does not penetrate the other rooms.

During transmission infrared radiation has the same physical properties as the light: it does not pass through opaque objects and reflects from surfaces. Moreover, it reflects better from bright surfaces than form the dark ones. These properties of infrared simultaneous interpreting system enable using it simultaneously in several rooms within one building, without any interference and disturbance. In fact, the system with 32 target languages does not affect the other system with 32 target languages in the neighboring room. It will be very difficult to achieve this result using radio frequencies.


Composition of the simultaneous interpreting system

Центральное устройство управления

Central control unit is the basic block. All other devices connect to this block.

Transmitting unit is a device in a separate block for signal modulation. There can be several options depending on the number of channels – with 4, 16 and 32 channels. It is connected to the central control unit via an optical cable.

Radiator of infrared waves is a special device that converts a signal into infrared waves using infrared LEDs.

Interpreter’s unit is a microphone panel designed specifically for simultaneous interpreters, has specific additional functions compared to a usual microphone. It enables selecting the channel for translation and connecting interpreter’s headphones.

Кабина переводчика


Booth for simultaneous interpreters is a very important element of the simultaneous interpreting system that has a great impact on the quality of the produced audio signal. It completely isolates interpreter’s workplace from external noise and interference.

Infrared receiver – this device is given to everyone who should listen to the simultaneous interpreting. It is an easy compact device with headphones. 

Headphones for IR receivers of simultaneous interpreting can be supplied in several variants:

Наушники для синхронного перевода

Кейс для зарядки ИК-приемников Bosch

Charging case for IR receivers. Each IR receiver has battery power elements. The case is suitable not only for charging, but also for storage and transportation of a large number of receivers.


Advantages of the digital interpreting system 

The main advantage of the digital infrared interpreting system is protection from interference caused by mobile phones, sunlight, fluorescent light. The previous analog systems were very susceptible to such interference.

As well as: 

  • High quality of sound in headphones, to almost stereo 18 kHz.
  • Simplicity of connection and setup of the system.
  • Possibility of control and setup from the administrator's computer.

If you have any questions or if you are interested to buy or get a commercial offer for simultaneous interpreting system for your conference room, the experts of LEATER will be glad to assist you.