Magnetic Recording: April 2010

Did you know ?

Posted by bac_production Friday, April 30, 2010 0 comments

Have you ever wondered how a whole album of your favorite music got onto one of those little cassette tapes? Or, what about computer floppy disks; have you ever wondered how they can hold 180 or more pages of typed text? The answer to both of these questions is magnetic recording

Magnetic recording devices seldom get much attention until they fail to work. But without magnetic recording, recording your favorite television show on a video cassette recorder would be impossible, portable tape players wouldn't exist, and you wouldn't be able to get money from an automated bank teller machine at two o'clock in the morning.

Now what about the Navy? Could it operate without magnetic recording? The answer is definitely no. Without it:

Computer programs and data would have to be stored on either paper cards or on rolls of paper tape. Both of these methods need a lot of storage space, and they take much longer to load into and out of the computer.

There wouldn't be any movies to show or music to play on the ship's entertainment system when the ship is at sea and is out of range for television and radio reception.

Intelligence-collection missions would be impossible since you couldn't store the collected signals for later analysis.

As you can see, magnetic recording plays a very important part both in our Navy life and in our civilian life.

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How Does It's Work ?

Posted by bac_production Saturday, April 24, 2010 0 comments

1. The voice or music is fed into microphones

2. Converted to electrical current and amplified as with disc recording.

3. The signal is then fed into an electromagnet called the recording head. Electric current passes through the coil of a magnetic head.

4. When the magnetic fields get to the head gap, some of them spread outside the core to form a fringing field.

5. When a recording medium is passed through this fringing field, it is magnetized in relation to the electric current. This is called magnetic recording

6. During playback, the motion of the device pulls a varying magnetic field across the gap. This creates a varying magnetic field in the core and therefore a signal in the coil.

7. This signal is then amplified and reproduced via speakers

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Pre-equisit Operational of Magnetic Recording

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In order to see the magnetic recording works, we need three things:

1. An input signal.
This input signal can come from microphone or from our original voice that is capable to produce a recordable signal.There are two types of input.First is the input signal that can be recorded simultaneously and second is the input signal that must be processed first (in case it is weak or out of frequency range)

2. Recording medium

A material that has the ability to become magnetized such as magnetic disk, hard disk and tape.

3. A magnetic head

Magnetic heads are the heart of the magnetic recording process. They are the transducers that convert the electrical variations of input signal into the magnetic variations that are stored on a recording medium.

There are three processes that are included in magnetic recording.