Earphone Wireless Headphones
The first peripheral to use Bluetooth technology will be a wireless headset. According to Ericsson's timetable, this headset for Ericsson T28 phones came out in July 2000. Nokia and Motorola's products will have to wait until late 2000. At that time, as long as you add a phone on the phone using Bluetooth technology accessories, and headphones placed in your ears, you can put the phone in the pocket, the hands of the hands of the liberation of the call, or even just press A button on the headset to answer the call. Moreover, since the Ericsson T28 has a voice recognition function, you can simply call someone to call some of the commonly used calls. Another selling point of the headset is that as the Bluetooth headset emits far less than the average handset headset, manufacturers will have the opportunity to vigorously render their health benefits.
But the Bluetooth positioning is low power, close wireless transmission, in the future of consumer electronics is still a huge application space. It will be mobile phones and PDA and other personal carry products for its largest application market. According to In-Stat estimates, by 2005, mobile phones will account for 71% of all Bluetooth applications, followed by personal computers and PC cards accounted for 14%, headphones accounted for 6%. Analysts pointed out that with the progress of Bluetooth technology and the decline in the cost of chipsets, Bluetooth and Wi-Fi will continue with half of the short-range wireless communications market.
And special miniature stealth wireless headset compared to civilian and industrial wireless headset can be described as varied variety. But in fact these headphones from its communications and electronics aspects, and there is not much special, more probably still related to the field of acoustics.
This type of headset, the entire system can refer to low-power simplex or duplex radio communication system for analysis. Generally pay attention to restore the sound quality of the fidelity, the appearance of exquisite, lovable; relatively, industrial wireless headset due to environmental reasons, the design of the reliability of the more focused on the performance.
In the circuit, the higher level of the product in the transmission process of processing, the general integration of analog or digital compression technology, the modulation used by a variety of such as RF RF, infrared, pure audio sensing. The use of RF varieties, the use of ultra-high band or Bluetooth technology products (900MHz - 2.4GHz, etc.) can be relatively more desirable technical indicators also meet the requirements of green, which in fact represents the field An important direction of development.
As shown in the figure, this broadcast TV director with full-duplex wireless headset, using a low-power FSK audio digital compression decompression modulation processing technology, in the human audible audio 20Hz - 20KHz range has a high degree of reduction Indicators and anti-jamming performance. The overall work in the UHF band 863MHz, PLL phase-locked loop to have a stable RF performance, the general environment, reliable communication distance greater than 150 meters.
In general, adaptive RF pulse coding (ADPCM) is often used in order to reduce the rate of transmission of digital speech signals in order to achieve a much better RF bandwidth or advanced modulation technique in order to achieve a higher quality digital voice compression transmission effect. ) Or continuously variable slope incremental modulation (CVSD), etc. to process the signal. These schemes are based on differential coding, and the basic concept is to send the difference between the current sample and the previous sample instead of sending the absolute value of the sample.
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