This portion of partial tracks is equal to the linear width of the helical-scan tracks because the full-track erase head produces a vertical, 90-degree erasure on the videotape across the slanted (about 6 degrees) field tracks.
The linear audio erase head deletes the underlying audio recording, except for the short distance between the audio erase and record heads, where the new signal will mix with the old.
When the recorder has a flying erase head, the underlying hi-fi audio information will be erased just ahead of the hi-fi audio-recording process and the new information will be recorded properly.
When a VHS recorder is placed in the record mode over an existing recording, the underlying control-track information is erased by both the full-track erase head and the control-track record head.
The longer test overrecordings were of sufficient length to completely erase the portion of the videotape between the full-track erase head and the beginning of the helical-scan heads (the pre-video erased area) (see Figure 3); whereas the short overrecordings did not completely erase that segment.
U] tracks continued until the physical distance between the full-track erase head and the beginning of the video record heads, which is located at the beginning of [O.
N], had all of the video information from the underlying recording but had no control-track sync because it had been erased by the full-track erase head.
Unlike the video information recorded by VCRs without a flying erase head, there was no observed mix of the underlying and overrecorded hi-fi audio information in the [O.
00-mm erased segment, E, which is the pre-video erased area, has no video, hi-fi audio, linear audio, or control-track information because they were erased by the full-track erase head.
The linear audio and control-track information are not present because they have been erased by the full-track erase head.
The hi-fi audio information is present in this portion, but the linear audio and control-track information have been erased by the full-track erase head.
The distance from the full-track erase head to the video-recording head has been designated as 80.