教學擴音(yīn)器(qì)有(yǒu)什₽≥π(shén)麽作(zuò)用(yòng)？

老(lǎo)師(shī)的(de)嗓子(zǐ)在教學中容易受到(dào)傷害，會(huì)有 ™★(yǒu)不(bù)适現(xiàn)象，為(wèi)了(le)更好(hǎo)的(de)傳遞教學內( ε→₩nèi)容不(bù)影(yǐng)響我們學生(shēng)正常聽(tīng)←π課，就(jiù)會(huì)使用(yòng)教學擴音(yīn)器(qì)來(lái)提高(gāo)教學質量，同時$♣$↑(shí)也(yě)能(néng)有(y♦₹↓×ǒu)效的(de)保護好(hǎo)嗓子(σ‌γzǐ)，一(yī)方面便于管理(lǐ)，另一(yī)方面幫學生(shēng)練聽(tī​φng)力。  

擴音(yīn)器(qì)的(de)正确使用(yòng)方法

1.擴音(yīn)機(jī)使用(yòng)時(shí)應避<★↕'免話(huà)筒正對(duì)喇叭，音(yīn)量>ε©調節合适清晰，這(zhè)樣能(néng)避免失真及反饋嘯叫現(xiàn)象。  

2.使用(yòng)中不(bù)要(yào) ☆扯拉、拖絞話(huà)筒線，否則容易出現(xiàn)線間(jiān)導線接觸εγ不(bù)良。

3.主機(jī)電(diàn)瓶不(bù)要(yào)長(chσβ"áng)時(shí)間(jiān)過充過放(fàng)電(diàn)↕✔‌，低(dī)電(diàn)量提示時(sh♦♥$‌í)應及時(shí)充電(diàn)  

4.寒暑假閑置不(bù)用(yòng)時(shí)應注意一(yī)至兩月(yuè)充一(yī)∑± '次電(diàn)。

5.長(cháng)期不(bù)用(yòng)應讓電(diàn)瓶放(fàng)電( ✘∞diàn)完。  

6.如(rú)果長(cháng)期不(bù)用(yòng)，應×₽放(fàng)在通(tōng)風(fēng)，幹燥，遠(yuǎn)離(l₩Ω&í)熱(rè)源，磁場(chǎng)的(de)地(dì)方。

選購(gòu)擴音(yīn)器(qì)時(shí)​→應注意  

第一(yī)，打開(kāi)擴音(yīn)器(qì)的(de)開(kāi)關，盡量将聲音™Ωδ♣(yīn)調到(dào)最大(dà)，聽(tīng)聽(tīng)是(shì&★β)否有(yǒu)雜(zá)音(yīn)。如₩≠♦(rú)果沒有(yǒu)雜(zá)音(yīn)，說(shuō)明(mín&><g)擴音(yīn)器(qì)工(gōng)作(zuò)在靜(jìng)止≈$β狀态下(xià)是(shì)沒有(yǒu)什(shén)麽雜(z✔φ€'á)音(yīn)的(de)。一(yī)些(xiē)質量比較差©εβ的(de)擴音(yīn)器(qì)，這(zhè)個(gè)時(shí)候很¥↓π₽(hěn)容易有(yǒu)雜(zá)音(yīn)，這(zhè)樣的(de)擴音£ ←(yīn)器(qì)就(jiù)不(bù)↔✔值得(de)買了(le)，用(yòng)不(bù)了(le)多(duō)久的β (de)。

第二，在将擴音(yīn)器(qì)的(de)聲音(yīn)調到(dào)最大>≥★(dà)的(de)時(shí)候，使用(yòng)擴音(yīn)器(qì)進行(xín∏↑g)擴音(yīn)。仔細聽(tīng)聽(tīng)擴大(dà)之後的(de)聲音$α(yīn)是(shì)否失真，如(rú)果擴音(yīn)∏↔₩ 器(qì)在最大(dà)聲的(de)時(shí)✔♣≤π候，音(yīn)質清晰，聲音(yīn)也(yě)夠洪亮(liàng)。這(zh•×≠©è)樣的(de)擴音(yīn)器(qì)多(duō)半不(bù)是(shì)什(sh₽©>λén)麽差的(de)擴音(yīn)器(qì)。  

第三，擴音(yīn)器(qì)的(de)'♦做(zuò)工(gōng)，雖然外(wài)觀不(bù)是(shì)最重要(y‌¥ào)的(de)因素，但(dàn)是(shì)擴音(yīn)器(qì)的(de)做(zuò)工(‌♠Ω≠gōng)處理(lǐ)确是(shì)一(yīγ←≤)個(gè)值得(de)我們細究的(de)因素，如(rú)果擴音(yīn)器(qì®♦)的(de)做(zuò)工(gōng)很(hě→×n)粗糙，這(zhè)些(xiē)擴音(yīn)器(qì)多(du•☆ō)數(shù)是(shì)不(bù)成熟的(de)産品，出現(xiàn)質量問(wè↓ ★↕n)題的(de)概率也(yě)是(shì)比較高(gāo)的(de)。

新式教學擴音(yīn)器(qì)  

傳統的(de)教學擴音(yīn)系統以有(yǒu)線式為(wèi)主，γ÷新式教學擴音(yīn)系統則以無線式為(wèi)  ε主，尤其是(shì)在高(gāo)等院校(xiào)中，大(dà)多(duō)都(dōu×​')使用(yòng)無線教學擴音(yīn)器(qì)。無線教學擴音(y​♣σ<īn)系統最初存在易嘯叫、音(yīn)質失真的(de)、且傳輸距離(lí>ελ≈)短(duǎn)的(de)缺點，但(dàn)‍•後來(lái)紅(hóng)外(wài)無線音(yīn)頻(pín)傳輸技(jì)術(shù)‌& ♣的(de)發展，在很(hěn)大(dà)程度上(shàng)改♣→₩進了(le)這(zhè)種新式教學擴音(yīn)器(qì)。

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The correct use of the amplifier.
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You should pay attention t∑σo electricity once or twice during the>ε¥≤ winter and summer vacation.
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6. If it is not used for a long time, it ‌εγshould be put in the place of ventilation, σγ₽dry, away from heat sou★Ωrce and magnetic field.
Pay attention when purcε∏hasing loudspeakers.
First, switch on the amplifier and t↔₹•ry to maximize the so≈‍"©und to hear if there is any noise. Iε≥f there is no noise, there is no noise iπ÷‍n the static state of the✔∑ amplifier. Some of the poor-quality amplifiers×↔≈, which are easy to have noise at this→× time, are not worth ©αbuying, and it won't take long.
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New teaching megaphone.
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