本文選題：無線雙耳助聽器　切入點：低功耗超寬帶收發(fā)機　出處：《清華大學(xué)》2014年博士論文

【摘要】：隨著世界人口老齡化的快速發(fā)展，助聽器的市場需求非常廣闊。而小型化的、配備無線通信功能的、具有雙耳信號處理能力的助聽設(shè)備是未來助聽器發(fā)展的方向。目前助聽器中的無線收發(fā)模塊的工作功耗在10mW量級，占整個助聽器70%以上的功耗。因此降低無線收發(fā)機的功耗是降低助聽器整體功耗的關(guān)鍵。本課題的研究目標(biāo)是將無線收發(fā)機功耗從10mW量級降低至1mW量級，以滿足小體積的、電池長期供電的雙耳助聽及其他移動終端的需求，避免反復(fù)更換電池對老年使用者帶來的不便，并為更復(fù)雜的雙耳語音數(shù)字信號處理提供條件。 本論文在雙耳無線助聽器關(guān)鍵技術(shù)和低功耗無線收發(fā)技術(shù)調(diào)研的基礎(chǔ)上，提出了兩種降低超寬帶收發(fā)機功耗的解決方案。 在第一種方案中，提出了使用8元頻移鍵控（8-FSK）子載波的調(diào)頻超寬帶（FM-UWB）技術(shù)以提高碼元速率及提高能量效率，，在750kb/s的數(shù)據(jù)速率下實現(xiàn)了5mW的功耗指標(biāo)。其采用65nm CMOS工藝實現(xiàn)。發(fā)射機采用具有快速建立時間的基于鎖相環(huán)（PLL）作為子載波調(diào)制器，采用環(huán)形壓控振蕩器與門控鎖頻環(huán)（FLL）作為寬帶FM調(diào)制器。接收機使用一個寬帶低噪聲放大器進行射頻放大，使用雙帶通濾波器結(jié)構(gòu)實現(xiàn)具有高線性度、抗窄帶干擾的FM解調(diào)器。 在第二種方案中，提出了2-FSK Chirp-UWB的低功耗超寬帶電路設(shè)計技術(shù)，它綜合了現(xiàn)有的脈沖超寬帶（IR-UWB）和調(diào)頻超寬帶（FM-UWB）的技術(shù)優(yōu)點，并抑制了各自的缺點。發(fā)射機在8GHz附近的500MHz頻帶上實現(xiàn)了10%門控的數(shù)字調(diào)制的正交Chirp脈沖，接收機前端采用15%門控的非相干頻率檢測的射頻解調(diào)方式，后端采用開環(huán)的10倍過采樣的時鐘和數(shù)據(jù)恢復(fù)技術(shù)，實現(xiàn)了低功耗、低輻射、快速位同步的無線收發(fā)機，其在比特速率1Mb/s下，功耗僅為1mW，達到了1nJ/bit的能量效率，實現(xiàn)了初始提出的低功耗研究目標(biāo)。 論文最后提出了一種基于便攜式終端的雙耳無線助聽器結(jié)構(gòu)。它應(yīng)用了Chirp-UWB的無線解決方案，將數(shù)字信號處理算法從耳側(cè)移至如智能手機的便攜式終端，從而進一步減小耳側(cè)助聽器功耗，提高助聽器數(shù)字信號處理的能力和靈活性，并降低了對無線接收機靈敏度指標(biāo)的要求。
[Abstract]:With the rapid development of the aging of the world ' s population , the market demand of the hearing aid is very broad . The miniaturization , equipped with wireless communication function , the hearing aid with dual - ear signal processing capability is the direction of the development of the hearing aid . The goal of this research is to reduce the power consumption of the wireless transceiver from 10 mW to 1 mW , so as to meet the needs of small - volume , long - term battery - powered binaural hearing aid and other mobile terminals , avoid the inconvenience caused by repeated replacement of the battery to the old user , and provide the conditions for more complex binaural sound digital signal processing .

Based on the research of the key technology and low power consumption wireless transmission / reception technology of binaural wireless hearing aid , two solutions for reducing the power consumption of ultra - wideband transceivers are proposed .

In the first scheme , the frequency modulation ultra - wideband ( FM - UWB ) technology using 8 - ary frequency shift keying ( 8 - FSK ) sub - carrier is proposed to improve the symbol rate and improve energy efficiency , and the power consumption index of 5mW is realized at the data rate of 750 kb / s . The transmitter adopts a band - locked loop ( PLL ) with fast settling time as the wideband FM modulator . The receiver uses a wideband low noise amplifier for radio frequency amplification , and uses a dual band pass filter structure to realize FM demodulator with high linearity and narrow band interference .

In the second scheme , the low - power ultra - wideband circuit design technique of 2 - FSK chirp - UWB is proposed , which combines the existing technical advantages of pulse ultra - wideband ( IR - UWB ) and frequency modulation ultra - wideband ( FM - UWB ) , and suppresses their respective disadvantages . The transmitter achieves 10 % gated digitally modulated orthogonal chirp pulse at 500 MHz band near 8GHz , and realizes low power consumption , low radiation and fast bit synchronization . The power consumption is only 1 mW at bit rate of 1 Mb / s , the energy efficiency of 1nJ / bit is achieved , and the initial low power consumption research target is realized .

In the end , a portable terminal - based dual - ear wireless hearing aid structure is proposed . The wireless solution is applied to move the digital signal processing algorithm from the ear side to the portable terminal like a smart phone , thereby further reducing the power consumption of the ear - side hearing aid , improving the capability and flexibility of the digital signal processing of the hearing aid , and reducing the requirement on the sensitivity index of the wireless receiver .

【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：R764.5;TN859

【共引文獻】

相關(guān)期刊論文 前1條

1 嚴馨葉;邱小軍;盧晶;;基于雙傳聲器的藍牙耳機降噪算法[J];應(yīng)用聲學(xué);2014年04期

相關(guān)博士學(xué)位論文 前1條

1 高峰;欠定松弛稀疏信號的盲分離研究[D];華南理工大學(xué);2012年

本文編號：1669422