Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1987-07-31
1989-07-25
Sikes, William L.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
358328, G11B 700
Patent
active
048520748
ABSTRACT:
A method of measuring the level of crosstalk noise in a playback signal produced from a recording disk such as a video disk, first and second signals of mutually different frequencies are recorded in respective sections of a track in a periodically alternating sequence. These first and second signals are also recorded in corresponding sections of at least one closely adjacent track in a periodically alternating sequence which is displaced with respect to the first-mentioned sequence. Playback of the first track is then repetitively performed, with switching selection of portions of the playback signal from the first sections and second sections respectively, and a derivation of levels of a beat component produced during these selected playback signal portions is obtained. The levels of the beat component are measured, and represent crosstalk noise levels.
REFERENCES:
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patent: 4413288 (1983-11-01), Hurst
patent: 4491877 (1985-01-01), Kanamaru
patent: 4549226 (1985-10-01), Tonita
patent: 4712204 (1987-12-01), Takemura et al.
Aoyama Hiroshi
Ito Takumi
Kuroda Nobuyoshi
Tanaka Hozumi
Pioneer Electronic Corporation
Sikes William L.
Ullah Akm E.
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