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Analysis of advantages and development history of bluetooth headset

Analysis of advantages and development history of bluetooth headset

  • Categories:Industry Trends
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  • Time of issue:2019-09-26 18:43
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(Summary description)The first peripheral to use Bluetooth technology will be a wireless headset. According to Ericsson's schedule, the headset for Ericsson's T28 phones came out in July 2000. Nokia and Motorola waited until late 2000. By then, you can simply attach a Bluetooth technology attachment to your phone and place the headset into your ear. You can put the phone in your pocket, free your hands while talking, or even just press a button on the headset to answer the call. And because Ericsson T28 has voice recognition, you can make common calls simply by naming people. Another selling point of the headset: because Bluetooth's range of emission is much lower than that of normal mobile phones, manufacturers will have the opportunity to highlight its health benefits.

Analysis of advantages and development history of bluetooth headset

(Summary description)The first peripheral to use Bluetooth technology will be a wireless headset. According to Ericsson's schedule, the headset for Ericsson's T28 phones came out in July 2000. Nokia and Motorola waited until late 2000. By then, you can simply attach a Bluetooth technology attachment to your phone and place the headset into your ear. You can put the phone in your pocket, free your hands while talking, or even just press a button on the headset to answer the call. And because Ericsson T28 has voice recognition, you can make common calls simply by naming people. Another selling point of the headset: because Bluetooth's range of emission is much lower than that of normal mobile phones, manufacturers will have the opportunity to highlight its health benefits.

  • Categories:Industry Trends
  • Author:
  • Origin:
  • Time of issue:2019-09-26 18:43
  • Views:
Information
The first peripheral to use Bluetooth technology will be a wireless headset. According to Ericsson's schedule, the headset for Ericsson's T28 phones came out in July 2000. Nokia and Motorola waited until late 2000. By then, you can simply attach a Bluetooth technology attachment to your phone and place the headset into your ear. You can put the phone in your pocket, free your hands while talking, or even just press a button on the headset to answer the call. And because Ericsson T28 has voice recognition, you can make common calls simply by naming people. Another selling point of the headset: because Bluetooth's range of emission is much lower than that of normal mobile phones, manufacturers will have the opportunity to highlight its health benefits.
 
But bluetooth is positioned for low-power, near-field wireless transmission, and there's plenty of room for future consumer electronics. It will take mobile phones and pdas as its biggest application market. By 2005, in-stat estimates, mobile phones will account for 71 percent of all bluetooth applications, followed by personal computers and PC CARDS (14 percent) and headphones (6 percent). As bluetooth technology improves and chipset costs fall, bluetooth and wi-fi will still account for half of the short-range wireless market, analysts say.
 
Compared with special miniature invisible wireless earphones, civil and industrial wireless earphones are various. But in fact, if this kind of earphone is studied from the aspect of communication and electronics, it is not so special, and it is more likely to be related to the discussion in the field of acoustics.
 
For this type of headset, the entire system can be analyzed with reference to low-power simplex or duplex radio communication systems. Generally pay attention to restore the fidelity of sound quality, beautiful appearance, lovely; In contrast, industrial wireless headsets are designed with more emphasis on reliability because of the environment.
 
On the electrical circuit, the higher grade product in the transmission process of processing, generally integrated with analog or digital compression technology, the modulation is also multifarious such as RF, infrared, pure audio induction. RF products and products using uhf or bluetooth technology (900MHz-- 2.4ghz, etc.) can achieve more ideal technical indicators and meet the requirements of environmental protection, which actually represents an important development direction in this field.
 
As shown in the figure, this radio and TV guide USES full-duplex wireless headset, which adopts low-power FSK audio digital compression and uncompression modulation processing technology, and has high reduction index and anti-interference performance in the range of 20hz-20khz human-audible audio. The whole work is in UHF band 863MHz, PLL PLL phase locked loop makes it have stable rf performance, reliable communication distance is more than 150 meters in general environment.
 
Generally, to obtain a relatively ideal high speed digital transmission of speech compression effect, generally require larger RF bandwidth or advanced modulation technology, in order to reduce the transmission rate of digital voice signal, also often use adaptive audio pulse coding (ADPCM) or continuous variable slope delta modulation (CVSD) technology to the signal processing. These schemes are based on differential coding. The basic concept is to send the difference between the current sampling and the previous sampling instead of sending the absolute value obtained from the sampling.
 
Many occasions will use wireless earphones, in addition to the radio and television system, such as call center, audio-visual teaching, home HIFI, hands-free communication personal mobile phone (bluetooth headset), "silent meeting", interview investigation, tourism and other wireless earphone systems have been able to show elegant appearance, is also gradually becoming a trend. In fact, there is not much difference in the basic structure or circuit principle between different types of wireless headphones, and it is not necessary to divide them into several strict categories. On the contrary, many earphones are used in a wide range of industries. At most, they are only used in different occasions. The parameters and costs of the system have a certain preference, which is the same as the requirements of specialized miniature wireless earphone system.

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