Working principle of Infra-red Simultaneous Interpretation system is to transmit difference languages by Infra-red. it’s the most advanced transmission of Wireless Simultaneous Interpretation on the marketing now.。Designing based on 850nm—900nm（10-9M）wavelength IR spectrum to transmit multi-channels languages. It has more advantage than others. It has Superior security first (Infrared only can be transmitted in one room, it can be obstruct by wall), also, it’s almost can prevent all of disturbs from electromagnetic wave or industry equipments. Keep a wide bandwidth for information transmission. So, it’s the most advanced transmission of wireless simultaneous interpretation system.

Now, there are two difference Bands used in the IR simultaneous interpretation system by difference factory.
1、 BAND2：45K－1MHz narrow transmission Band (most of products on the marketing are used it)
2、 BAND4：2MHz-6MHz wide transmission Band
　　Fig. 1：

45KHz-1MHz（BAND2） narrow transmission Band, it spaced by 40KHz frequency, can be setup 16 sub-carrier wave transmission channels at most. (as Table.1) Designed by sub-carrier wave frequency modulation with ±7.5KHz frequency deflection. System can produce Max 20Hz-8KHz frequencies and 45dB S/N audio outputs.

Narrow transmission band can be easily disturbed by high frequency lights. （as fluorescent lamp） because high frequency lightsr can produce 1-N times disturbing harmonic. These disturbing waves are also transmission within the range of BAND2, so, it will brings strong disturbs to the 16CH frequency points. Then also will influence system voice quality and transmission distance. (Fig.2)

2MHz-6MHz （BAND4）wide transmission Band, it spaced by 200KHz frequency, can be setup 32sub-carrier wave transmission channels at most. (as Table 2) Designed by sub-carrier wave frequency modulation with ±22.5KHz frequency deflection. System can produce Max 20Hz-12KHz frequencies and higher than 45dB S/N audio outputs.

IR transmission system designed based on BAND4, there is almost no disturbs from the high frequency drive lights. So, system working based on BAND4 is can reach much better efficiency. Also, wide band sub-carrier with wide frequency, S/N is higher, and there is almost no disturbs between every channels (32 channels at most).

Taiden Company in order to ensure the transmission quality, to enhance system’s power of prevent disturbs, we design all IR system based on wide sub-carrier transmission. Only two of the manufactory used this new technology into simultaneous interpretation system now in the world.