c. All of the audio tracks (narrative, recording, control track signal pulses
and cueing) are recorded longitudinally on the tape as illustrated (fig 1-6).
One-inch helical scan video tape showing all dimensions and relative
positions on the tape
The 5.5 to 6.5mHz bias signal is used in a number of ways. The bias signal
is applied to each of the erase heads for erasing the tape, i.e.; to rearrange the
magnetic pattern of iron oxide particles to a neutral signal impression (fig 1-7).
a. Thus, the pattern of the old information is removed and the tape is ready
for a new recording.
b. The bias signal provides recording bias power throughout the equipment.