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Tiem tang hiem hoa giam thinh tu may nghe nhac

Chi can ben minh mot chiec may nghe nhac di dong ti hon, nguoi nghe co the mang theo ca rap hat voi nhung nhac pham ua thich. Tuy nhien, cac thiet bi nay tiem tang hiem hoa gay giam thinh luc cua nguoi nghe.

Ket qua cua Vien nghien cuu Am hoc quoc gia Sydney cho thay so nguoi su dung may nghe nhac ca nhan hien nay luon de am luong o muc nguy hiem.

Cung theo mot nghien cuu cua RNID - Vien nghien cuu khiem thinh Hoang gia, co toi 39% so thanh nien tu 18 den 24 tuoi su dung may nghe nhac ca nhan moi ngay it nhat 1 tieng va 42% thu nhan luon nghe o muc am luong lon.

Cac sinh vien co khuynh huong cao gap 2 lan trong viec nghe nhac o am luong that lon va hon ½ so sinh vien khong muon gioi han thoi gian nghe, 1/3 trong so ho noi rang ho khong thich giam am luong.

Nghien cuu cung chi ra hon ½ so sinh vien va 40% nguoi truong thanh co it nhat mot loai benh mat thinh luc, mot so thay kho nghe trong cac cuoc thao luan, mot so cho rang can phai tang am luong o may thu hinh hay dai moi nghe duoc ro, mot so khac lai thay co tieng la o trong tai.

Cac van de mat thinh luc khong co dau hieu ro rang trong mot vai nam nhung mot khi xuat hien se khong the khoi phuc duoc. Tai se bi ton thuong vinh vien. Hien nay tai My co khoang 30 trieu nguoi My gap nhung van de ve mat thinh luc. Mot phan ba trong so ho da bi lang tai.

Nguyen nhan cua su giam thinh luc khi su dung nhung thiet bi nay la thoi quen su dung khong dung cach cua nguoi nghe nhac. Ho thuong co xu huong mo nhac to qua muc trong khoang thoi gian dai.

Nhung nguoi nghe nhac bang may nghe nhac di dong khong muon bi nhung tap am ben ngoai anh huong den viec thuong thuc am nhac cua ho hay don gian do chi la do thoi quen cua nhung nguoi tre tuoi.

Con theo tien si Rochester Minn - nguoi dieu hanh chuong trinh Cuu tro thinh giac o Mayo Clinic - cho rang: “Truoc day cac thiet bi nghe nhac nhu Walkman chang han, khi ban tang am luong cua chung cao het muc thi am thanh nghe se rat toi, vi vay da so nguoi nghe nhac khong lam vay.

Con ngay nay, du ban mo to het muc, chat luong am thanh van rat tot, do cung chinh la mot trong nhung nguyen nhan dan den van de rat dang lo lang nay!”.

Co che cua su suy giam thinh luc

Am thanh ben ngoai tac dong va gay ton thuong toi cac te bao long chuyen - mot bo phan cua tai co chuc nang dan truyen song am den nao bo. Cac te bao vung nay co the phuc hoi sau nhung ton thuong tam thoi.

Nhung nhung tieng on qua lon hoac khong qua lon nhung tac dong trong thoi gian dai se lam cho nhung te bao long chuyen bi ton thuong vinh vien.

Tat nhien, dieu do lam thinh luc cua ban cung bi giam theo va khong the khoi phuc lai duoc. Cac chuyen gia tai Mayo Clinic o Minnesota cho rang nhung am thanh tren 90 decibel tac dong lien tuc trong mot thoi gian dai la nhung nguyen nhan gay ra benh lang tai nhung hau het cac thiet bi choi nhac di dong hien nay deu duoc san xuat voi am luong lon hon 120 decibel.

Chien luoc phong ngua:

- Khong nen nghe nhac lien luc trong thoi gian qua lau voi am luong lon hon 90 decibel. Khuyen cao nguoi nghe de am luong o muc bang hoac nho hon 80 decibel.

- Dung loai tai nghe vanh rong, trum kin tai, do loc tieng on tot, khong nen dung loai tai nghe nhet trong ong tai.

- Neu ban thuong xuyen o nhung noi on ao, am thanh lon thi nen co gang tao cho minh mot quang thoi gian thu gian yen tinh sau mot khoang thoi gian nhat dinh hoac su dung mieng dem tai de giam thieu am thanh.

- Ban hay giam thieu am luong den muc co the, tranh xa tieng on va co gang bao ve doi tai cua ban.

Lam the nao de biet duoc am luong ban dang nghe qua lon?

Neu ban khong co nhung thiet bi do decibel cua am thanh cho may choi nhac, mot so nhung cach don gian sau se giup ban kiem soat xem am luong nghe nhac cua ban da qua lon hay chua?

- Am luong may nghe dat muc lon hon 60% am luong .

- Khong the nghe thay nhung cuoc tro chuyen cua nhung nguoi xung quanh khi ban dang nghe nhac.

- Nhung nguoi o gan co the nghe thay tieng nhac ban dang nghe.

- Ban nhan thay hinh nhu ban dang het len thay vi noi chuyen binh thuong trong cuoc tro chuyen voi ai do.

Tom lai, mot so kien thuc va mach nuoc tren se giup ban phan nao tu bao ve tot doi tai quy gia cua minh khi su dung cac thiet bi nghe nhac di dong, dam bao cho viec thuong thuc am nhac trong nhieu nam.

Article source http://w4rum.com/659.t

[By ] [03/Mar/07]
 
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