藍(lán)牙4部分模塊：最后準(zhǔn)備好黃金時(shí)間

　　在批準(zhǔn)了任何新標(biāo)準(zhǔn)或?qū)ΜF(xiàn)有的協(xié)作規(guī)范進(jìn)行重大更改之后，該行業(yè)需要時(shí)間來適應(yīng)。如果該標(biāo)準(zhǔn)得到廣泛認(rèn)可并在市場中根深蒂固，情況尤其如此。在無線消費(fèi)品和工業(yè)產(chǎn)品中，沒有比藍(lán)牙更根深蒂固的東西了。自1998推出以來，藍(lán)牙技術(shù)已成為世界上最具影響力的技術(shù)之一，成為便攜式設(shè)備中無線通信的標(biāo)準(zhǔn)。

　　然而，雖然傳統(tǒng)的藍(lán)牙協(xié)議已經(jīng)證明是有用的，并且在諸如中等數(shù)據(jù)速率的流音頻等任務(wù)中占據(jù)了個(gè)人區(qū)域網(wǎng)絡(luò)（PAN）空間，最新的迭代，藍(lán)牙4，完全改變了游戲。這是通過包括“經(jīng)典藍(lán)牙”與“藍(lán)牙高速”，跳躍的Wi-Fi來實(shí)現(xiàn)更高的利率，和“藍(lán)牙低能量（LE）”，這使得它能夠在一個(gè)范圍內(nèi)的高達(dá)160英尺（50米）是吝嗇的。

　　Bluetooth Low Energy technology operates in the same spectrum range （the 2.400 GHz-2.4835 GHz ISM band） as Classic Bluetooth technology， but uses a different set of channels. Instead of Bluetooth’s traditional seventy-nine 1 MHz-wide channels， LE has forty 2 MHz-wide channels. The bit rate is 1 Mbit/s， and the maximum transmit power is 10 mW.

　　While the Bluetooth 4.0 specification has been out for several years， it has taken that long for parts， stacks， and modules to arrive from competitive sources. Beyond that， and as is often the case with new standards， early offerings were fraught with misinterpretations of the specification （even from companies represented on the standards committee）。 First-pass silicon was early on the learning curve， and even companies with a lot of RF expertise found several passes were needed to get it right.