IR Wireless Microphone Improved by the Innovated patent techhonogy IC

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IR Wireless Microphone Improved by the Innovated patent techhonogy IC
Andy Liu ，Lan Wang，MC Devices

There are many advantages in IR wireless microphone. And two advantages among them are distinct. The first distinctive advantage of IR wireless is high confidentiality--different from UHF wireless signals which can go through walls, the IR wireless signals will rebound back when it is blocked by something solid (such as walls). IR wireless signals will not be intercepted from the other side of the wall, and will not be interfered by another IR wireless microphone used in the next room. Therefore, IR wireless microphones is the best choice for some institutions, such as confidential meetings of high levels of armies, governments and companies, as well as schools using wireless microphone in teaching. The other distinct advantage of IR wireless microphone is that it is easy to use as it does not need adjusting. In many places such as schools, with the use of UHF wireless microphones, the teachers have to re-adjust the frequency of their pendant microphones every time when they enter into a different classroom. As a result, UHF wireless microphones are not popular among teachers, especially female teachers. Yet with the use of an IR wireless microphone, the teachers may begin to teach once they turn on the microphone.

Traditional IR wireless microphones adopts LC circuit, with the defects of unstable frequency, bad frequency response, small dynamic range and bad anti-interference. The patent techonology IC developed by MC Devices solves all of the problems of the traditional IR wireless micophone. Microphones using patent techonology IC are distinguished in the following aspects: improvement in stability and accuracy of the frequency; lower frequency error (within ±2ppm); broader operating temperature range (-40~+85℃); broader modulation response range (50Hz~30KHz±1dB); higher ratio of signal to noise (>100DB); lower modulation distortion (<0.2%); broader modulation frequency deviation range (±75KHz).

As the frequency can be selected from a wide range, it avoids the range (2~3MHZ) which is easily interfered. What’s more, it uses multi-converted frequency, which improves anti-interference and the function of IR wireless microphone. The following table makes comparison between the IR wireless microphone with patent techonology IC and that with traditional LC circuit, which shows that the performance of former one is better than the latter one.

	IR Wireless Microphone with the IC invented by MCD	IR Wireless Microphone with traditional LC circuit
1	stable frequency narrower frequency error range (within ±2ppm), broader operating temperature range (-40~+85℃)	LC circuit (with unstable frequency) broader frequency error range (within ±10ppm), narrower operating temperature range (+10~+40℃)
2	Modulation Distortion <0.3%	Modulation Distortion <5%.
3	better anti-interference and stability	Once-converted frequency, direct modulation (worse anti-interference and stability despite of low cost)
4	Multi-channel	single-channel
5	Wider frequency modulation circuit ?(50HZ~20KHZ±1dB), deviation: ±75KHz	Narrower frequency modulation circuit ?(300HZ~5KHZ±4dB), deviation: ±10KHz

Apart from the patent technology IC, MC Devices also provides other technical support, including IR sensor, IR receiver, transmitter, which could shorten research cycle of IR wireless microphones.

Summary

Using environmental protection products has already become a symbol for healthy life. And IR wireless microphone is an unique one among many wireless electromagnetism radiation products. It can be called a green electronic product. During the previous decade, famous IC design companies have developed their IC with higher and higher frequency, while IC with lower frequency several MHz are seldom presented. MC Devices believes that lower frequency IC has a promising and stable market. The IC invented by MCD can greatly improve the function of IR wireless microphones, and can work exactly the same as UHF wireless microphones. It is firmly believed that, with the technical support from MC Devices, IR wireless microphone market will have a brighter future。