Dynamic magnetic information storage or retrieval – Modulating or demodulating – Frequency
Patent
1982-07-19
1984-12-04
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Modulating or demodulating
Frequency
360 22, G11B 504, G11B 1502
Patent
active
044867930
ABSTRACT:
This invention reduces crosstalk interference components without a significant increase in recorded bandwidth of the modulated audio signals and without a significant degradation of the signal-to-noise ratio of the reproduced audio signals. According to the invention, the nominal carrier frequency of the modulated audio signals in adjacent tracks or scans is offset by an amount sufficient to shift the crosstalk interference components outside the desired audio pass band for substantially all modulating amplitudes and frequencies. At the same time, the modulated audio frequency spectra of the adjacent tracks substantially overlap so that additional overall bandwidth requirements are minimized. A satisfactory offset from track to track is in the order of twice the maximum audio response frequency. As the offset is reduced or as occasional high frequency high amplitude audio occurs in adjacent tracks, crosstalk distortion components will tend to appear beginning at the high frequencies. Such crosstalk interference can be further reduced by the use of frequency dependent compressor-expander noise reduction because of the tendency of the interference to locate in one part of the audio band rather than across the entire audio band as in the case of no track-to-track carrier offset.
REFERENCES:
patent: 3222459 (1965-12-01), Drapkin
patent: 3234323 (1966-02-01), Kihara
patent: 4322746 (1982-03-01), Oguino
patent: 4425585 (1984-01-01), Sekimoro et al.
Canney Vincent P.
Dolby Laboratories Licensing Corporation
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