 The device can also be made more compact than if each sweep recorded a full frame, as this would require a double diameter drum rotating at half the angular velocity and making longer, shallower sweeps on the tape to compensate for the doubled line count per sweep.However, when a still image is produced from an interlaced video tape recording, on most older consumer grade units the tape would be stopped and both heads would just repeatedly read the "same" field of the picture, essentially halving the vertical resolution until playback proceeds.The other option is to capture a full frame (both fields) upon pressing the pause button right before actually stopping the tape, and then repetitively reproduce it from a frame buffer.