(4) Physical makeup: Magnetic tape can be cut, spliced, and easily repaired if broken.
b. Disadvantages. There are a few drawbacks of magnetic recording tape:
(1) Effects of external magnetism: Magnetic recording tape is greatly affected by external
magnetic fields from motors and electromagnets which can cause partial or even total erasure of the
recorded information.
(2) Temperature and humidity variations: Magnetic recording tape expands and contracts
with extreme variations in temperature. The plastic backing becomes brittle when cold, and stretchable
when hot. Moisture retained within the iron oxide particles causes some of the particles to fall off,
resulting in tape head clogging.
(3) Dirt, dust, and oil: Dust or dirt settling on the tape can cause loss of frequency response
or loss of the entire signal. Introduction of body oils from the fingers through frequent handling can also
cause loss of frequency response.
Learning Event 2:
EDIT AND SPLICE FORMATS
1.
Simply stated, editing is removing or adding segments to a tape recording. It may consist of a
simple removal or adding of complete sections, combining sections, or cutting out and replacing a single
word. In a well-edited tape, there should not be the slightest hint that editing has been performed. No
pops, clicks or extraneous sound, should be heard. There should only be the smoothly played back
recording.
a. Types of formats. The only kind of format that may be edited is the single track format.
This is to include any number of tracks that are recorded in the same direction. Therefore, tape recorded
on one track of a two-or four-track recorder, may be edited.
b. Sound recognition. Sound on any magnetic medium is made up of variations recorded at a
certain speed; for example, when 71/2 ips is played back at the 7 1/2 ips speed, the reproduced sound is
almost exactly the same as the original. If sound recorded at one speed is reproduced at a slower speed,
the pitch of the sound is lower and the sound is dragged out in articulation. For example, if a tone
frequency of 1,000 Hz was recorded at the speed of 30 ips and played back at 15 ips, it would be heard
at a frequency of 500 Hz (at 7 1/2 ips the frequency would be 250 Hz and at 3 3/4 ips it would be 125
Hz).
(1) The ability to recognize sounds recorded at slower speeds should begin with those easiest
to recognize; the fricative sounds of f, v, s and z, and with the hard sound of t, b, p and d. At very low
speeds there is a similarity between the sound of t and s. The beginning tongue click constitutes almost
the only differentiating sound.
(2) After acquiring the ability to recognize the hard consonant
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