Title :
A study on modulation noise reduction in digital recording
Author :
Matsui, T. ; Kamijo, K. ; Ohshima, H.
Author_Institution :
NHK Sci. & Tech. Res. Labs., Tokyo, Japan
fDate :
9/1/1997 12:00:00 AM
Abstract :
In digital recording, modulation noise is one of causes of degradation of the signal-to-noise ratio. A new mathematical model of reproduced digital signals including modulation noise is derived by considering that the major element of modulation noise in short-wave recording is head-to-media spacing variations. The total noise calculated from the mathematical model coincides with the noise extracted from reproduced digital signals of VCRs. A modulation noise reduction method which utilizes the mathematical model is proposed, and a simulation of reducing the modulation noise is shown. The improvement in the signal-to-noise ratio as a result of removing the modulation noise is approximately 2 dB
Keywords :
digital magnetic recording; digital signals; magnetic recording noise; simulation; surface topography; video tape recorders; VCRs; digital recording; head-to-media spacing variations; mathematical model; media surface roughness; modulation noise reduction; reproduced digital signals; short-wave recording; signal-to-noise ratio degradation; simulation; Circuit noise; Degradation; Digital modulation; Digital recording; Frequency; Magnetic noise; Mathematical model; Noise reduction; Rough surfaces; Signal processing; Signal to noise ratio; Surface roughness; Video recording;
Journal_Title :
Magnetics, IEEE Transactions on
