Patent ID: 6459848
Filing Date: 2002-10-01
Classification: G11B,H04N

Abstract:
A method of magnetic recording, comprising the steps of:alternately using first and second magnetic heads to record an analog video signal on a magnetic recording medium while sequentially forming first tracks on the magnetic recording medium, the magnetic recording medium being fed with respect to a rotary drum at a predetermined speed, the magnetic recording medium being wound on an outer circumferential surface of the rotary drum along a part of a helix in a predetermined angular range, the first and second magnetic heads being attached to the rotary drum, the first and second magnetic heads being diametrically opposed to each other, the first and second magnetic heads being in a first predetermined height position with respect to the rotary drum, the first and second magnetic heads having different azimuth angles respectively; and alternately using third and fourth magnetic heads to record a digital video signal on the magnetic recording medium while sequentially forming and writing second tracks over at least portions of the first tracks on the magnetic recording medium, the third and fourth magnetic heads being attached to the rotary drum, the third and fourth magnetic heads being diametrically opposed to each other, the third and fourth magnetic heads being in a second predetermined height position with respect to the rotary drum, the second predetermined height position being different from the fist predetermined height position, the third and fourth magnetic heads having different azimuth angles respectively, the azimuth angles of the third and fourth magnetic heads being different from the azimuth angles of the first and second magnetic heads, the digital video signal being in a frequency band wider than a frequency band of the analog video signal, the frequency band of the digital video signal including a frequency band of a frequency converted carrier chrominance signal of the analog video signal, the digital video signal being free from periodicity of its record waveform; wherein the digital video signal results from subjecting an original video signal to a scramble interleaved NRZI process, and wherein the digital video signal is in a frequency band wider than a frequency band of the analog video signal, the frequency band of the digital video signal includes a frequency band of a frequency converted carrier chrominanee signal of the analog video signal, and the digital video signal is free from periodicity of its record waveform.