Jun
18
Kalibrasi Ulang Baterai iPhone
Smartphone makin canggih dan kinclong. Dan juga makin tipis. Untuk bisa setipis yang kamu lihat sekarang, beberapa smartphone mesti bikin pengorbanan: tidak ada lagi tutup baterai, alias baterai tidak bisa diganti. Kebiasaan untuk tidak bisa mengganti baterai, seperti kebiasaan lain-lain, dimulai dari Apple. Kawanku, baterai iPhone tak bisa diganti, sekarang beberapa smartphone lain pun menyusul memasukan baterai kedalam cangkang yang tidak gampang dibuka, diantaranya adalah HTC One, HTC One X, Nokia Lumia 900 series, Sony Xperia Z, Motorola Droid Razr Maxx.

 

Masalahnya sekarang adalah, gimana kalau baterai iPhone kamu mulai menunjukkan sedikit attitude seperti yang dialami dua orang teman saya? Yup, iPhone juga bisa punya attitude. Yang mereka alami adalah iPhone mereka tiba-tiba mati saat indikator batere masih 35% (dan seorang yang lainnya bahkan 80%).

Kalau kamu lagi mencari gimana caranya biar batere iPhone awet dipake, nanti saya bahas di artikel lain, sementara ini artikel ini hanya akan membahas kasus seperti yang dialami dua kawan tadi.

Yang kedua kawan tadi butuhkan adalah kalibrasi ulang batere. Intinya adalah mensikronkan kembali antara kapasitas real batere dan indikatornya. Caranya adalah sebagai berikut:

1. Gunakan iPhone sampai batere habis dan iPhone mati dengan sendirinya.
2. Charge iPhone sampai penuh 100% tanpa terputus. Ini penting, jangan sampai putus.
3. Setelah penuh, lakukan reset dengan cara tekan dan tahan tombol sleep dan tombol home secara berbarengan hingga muncul logo Apple (acuhkan tanda Swipe to Power Off").
4. Gunakanlah dengan normal hingga baterai habis, perhatikan indikator baterai, seharusnya iPhone akan mati pada saat baterai mencapai antara 0% hingga 3%.

Kalau baterai iPhone anda tidak memperbaiki attitude nya tersebut, mungkin sudah saatnya mempertimbangkan upgrade ke iPhone gerenasi lebih lanjut misalnya iPhone 5. Toh iPhone 5 memang jauh lebih kaya feature, baterai tahan lama, lebih enak dipakai karena layar gede dan ringan, dll. Untuk seluruh model iPhone, silakan cek harga iPhone di sini.

Mungkin PeEr selanjutnya adalah mengamati berapa lama sih sebenernya batere iPhone kamu bertahan dalam satu kali charge, sehari? setengah hari? dua hari? Walaupun memang umur batere sangat tergantung pemakaian kamu, kamu tetap bisa sedikit menghemat batere dengan cara-cara tertentu. Hal ini kita bahas lain waktu.

Kebiasaan tidak bisa ganti baterai sekarang tidak hanya sebatas pada smartphone doang. MacBook Air dan MacBook Pro sekarang pun baterai nya non-replaceable. Dan kelihatannya beberapa ultrabook lain-lain dari Lenovo, Asus dan Acer pun mulai menggunakan trik ini.

KALIBRASI ULANG BATERAI IPHONE

Though Robin and Joan Rolfs owned two rare talking dolls manufactured by Thomas Edison’s phonograph company in 1890, they did not dare play the wax cylinder records tucked inside each one.

The Rolfses, longtime collectors of Edison phonographs, knew that if they turned the cranks on the dolls’ backs, the steel phonograph needle might damage or destroy the grooves of the hollow, ring-shaped cylinder. And so for years, the dolls sat side by side inside a display cabinet, bearers of a message from the dawn of sound recording that nobody could hear.

In 1890, Edison’s dolls were a flop; production lasted only six weeks. Children found them difficult to operate and more scary than cuddly. The recordings inside, which featured snippets of nursery rhymes, wore out quickly.

Yet sound historians say the cylinders were the first entertainment records ever made, and the young girls hired to recite the rhymes were the world’s first recording artists.

Year after year, the Rolfses asked experts if there might be a safe way to play the recordings. Then a government laboratory developed a method to play fragile records without touching them.

Audio

The technique relies on a microscope to create images of the grooves in exquisite detail. A computer approximates — with great accuracy — the sounds that would have been created by a needle moving through those grooves.

In 2014, the technology was made available for the first time outside the laboratory.

“The fear all along is that we don’t want to damage these records. We don’t want to put a stylus on them,” said Jerry Fabris, the curator of the Thomas Edison Historical Park in West Orange, N.J. “Now we have the technology to play them safely.”

Last month, the Historical Park posted online three never-before-heard Edison doll recordings, including the two from the Rolfses’ collection. “There are probably more out there, and we’re hoping people will now get them digitized,” Mr. Fabris said.

The technology, which is known as Irene (Image, Reconstruct, Erase Noise, Etc.), was developed by the particle physicist Carl Haber and the engineer Earl Cornell at Lawrence Berkeley. Irene extracts sound from cylinder and disk records. It can also reconstruct audio from recordings so badly damaged they were deemed unplayable.

“We are now hearing sounds from history that I did not expect to hear in my lifetime,” Mr. Fabris said.

The Rolfses said they were not sure what to expect in August when they carefully packed their two Edison doll cylinders, still attached to their motors, and drove from their home in Hortonville, Wis., to the National Document Conservation Center in Andover, Mass. The center had recently acquired Irene technology.

Audio

Cylinders carry sound in a spiral groove cut by a phonograph recording needle that vibrates up and down, creating a surface made of tiny hills and valleys. In the Irene set-up, a microscope perched above the shaft takes thousands of high-resolution images of small sections of the grooves.

Stitched together, the images provide a topographic map of the cylinder’s surface, charting changes in depth as small as one five-hundredth the thickness of a human hair. Pitch, volume and timbre are all encoded in the hills and valleys and the speed at which the record is played.

At the conservation center, the preservation specialist Mason Vander Lugt attached one of the cylinders to the end of a rotating shaft. Huddled around a computer screen, the Rolfses first saw the wiggly waveform generated by Irene. Then came the digital audio. The words were at first indistinct, but as Mr. Lugt filtered out more of the noise, the rhyme became clearer.

“That was the Eureka moment,” Mr. Rolfs said.

In 1890, a girl in Edison’s laboratory had recited:

There was a little girl,

And she had a little curl

Audio

Right in the middle of her forehead.

When she was good,

She was very, very good.

But when she was bad, she was horrid.

Recently, the conservation center turned up another surprise.

In 2010, the Woody Guthrie Foundation received 18 oversize phonograph disks from an anonymous donor. No one knew if any of the dirt-stained recordings featured Guthrie, but Tiffany Colannino, then the foundation’s archivist, had stored them unplayed until she heard about Irene.

Last fall, the center extracted audio from one of the records, labeled “Jam Session 9” and emailed the digital file to Ms. Colannino.

“I was just sitting in my dining room, and the next thing I know, I’m hearing Woody,” she said. In between solo performances of “Ladies Auxiliary,” “Jesus Christ,” and “Dead or Alive,” Guthrie tells jokes, offers some back story, and makes the audience laugh. “It is quintessential Guthrie,” Ms. Colannino said.

The Rolfses’ dolls are back in the display cabinet in Wisconsin. But with audio stored on several computers, they now have a permanent voice.

Ghostly Voices From Thomas Edison’s Dolls Can Now Be Heard

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