Magnetic Recording
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Magnetic Recording: How a T a pe Recording Machine Works To record a tape, the first step is erasure of the preexisting recording. To accomplish this, a bias oscilla tor generates a current which is u sed to feed the erase head. This removes any magnetism that might already be present on the tape. The next step depends on whether the machine is a stereo or mono recorder. A mono recorder will record with two t racks, one for each side of the ta pe. A stereo recorder uses four tracks, one for each chan nel on each sid e. The recording an d playback heads are placed in such a way that side one uses the first and third tracks, while side two uses the second and four th tracks (see illustratio n below). This way , when the tape is turned over to the other side, the opposite two tracks are used for recording and playback. The recording process is relat ively simple. The voice or music is fed into microphones, which is then converted to electrical current and amplified as with disc recording. The signal is then fed into an electromagnet called the recording head. Va rying electrical currents produce varying degrees and patterns of magnetism in the tape. layback is exactly the reverse. The tape!s magnetism, as it passes over the playback head, induces electrica l current in the electromagnet . This signal is then amplified and reproduced via speakers. "ee illustration below for an explanation of the process. #t is important to reali$e that placing a magnet close to a tape will cause erasure.
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Transcript of Magnetic Recording
7/18/2019 Magnetic Recording
http://slidepdf.com/reader/full/magnetic-recording 1/2
Magnetic Recording: How a Tape Recording Machine
Works
To record a tape, the first step is erasure of the preexisting recording. To accomplishthis, a bias oscillator generates a current which is used to feed the erase head. This
removes any magnetism that might already be present on the tape.
The next step depends on whether the machine is a stereo or mono recorder. A mono
recorder will record with two tracks, one for each side of the tape. A stereo recorder
uses four tracks, one for each channel on each side. The recording and playback
heads are placed in such a way that side one uses the first and third tracks, while side
two uses the second and fourth tracks (see illustration below). This way, when the
tape is turned over to the other side, the opposite two tracks are used for recording and
playback.
The recording process is relatively simple. The voice or music is fed into
microphones, which is then converted to electrical current and amplified as with disc
recording. The signal is then fed into an electromagnet called the recording head.
Varying electrical currents produce varying degrees and patterns of magnetism in the
tape. layback is exactly the reverse. The tape!s magnetism, as it passes over the
playback head, induces electrical current in the electromagnet. This signal is then
amplified and reproduced via speakers. "ee illustration below for an explanation ofthe process.
#t is important to reali$e that placing a magnet close to a tape will cause erasure.
7/18/2019 Magnetic Recording
http://slidepdf.com/reader/full/magnetic-recording 2/2
Magnetic Recording: Bagaimana Rekaman Tape Machine Works
Untuk merekam kaset, langkah pertama adalah penghapusan rekaman
sudah ada sebelumnya. Untuk mencapai hal ini, bias osilator menghasilkan
arus yang digunakan untuk memberi makan menghapus kepala.
Menghilangkan semua magnet yang mungkin sudah hadir dalam rekaman.
Langkah berikutnya tergantung pada apakah mesin adalah stereo atau mono
perekam. Sebuah perekam mono akan merekam dengan dua lagu, satu
untuk setiap sisi rekaman itu. Sebuah perekam stereo menggunakan empat
lagu, satu untuk setiap saluran di setiap sisi. erekaman dan pemutaran
kepala ditempatkan sedemikian rupa sehingga satu sisi menggunakan trek
pertama dan ketiga, sedangkan sisi dua menggunakan trek kedua dan
keempat !lihat ilustrasi di ba"ah#. $engan cara ini, ketika rekaman itu
diserahkan ke sisi lain, sebaliknya dua lagu yang digunakan untuk merekam
dan playback.
roses rekaman relati% sederhana. Suara atau musik dimasukkan ke dalam
mikro%on, yang kemudian diubah men&adi arus listrik dan diperkuat sebagai
disc dengan rekaman. Sinyal tersebut kemudian dimasukkan ke dalam
sebuah elektromagnet yang disebut kepala rekaman. Mem'ariasikan arus
listrik menghasilkan berbagai tingkat dan pola magnet dalam rekaman itu.
layback adalah persis sebaliknya. Magnet tape, saat mele"ati kepala
playback, menginduksi arus listrik dalam elektromagnet. Sinyal ini kemudian
diperkuat dan direproduksi melalui speaker. Lihat ilustrasi di ba"ah ini untuk
pen&elasan dari proses.
(dalah penting untuk menyadari bah"a menempatkan sebuah magnet dekat
dengan tape akan menyebabkan penghapusan.
