Claims
- 1. A method of detecting and evaluating dropouts in recording media, particularly magnetic data recording media, having digital signals recorded on at least one track, wherein the digital signals are read and rectified to form an envelope, and the envelope is differentiated, the magnitude of the pulses resulting from the differentiation, which represents the rate of change of the dropout and serves as a criterion for the seriousness of the dropout, being registered.
- 2. A method as claimed in claim 1, wherein the pulses resulting from the differentiation of said envelope are evaluated in a threshold detector having adjustable threshold stages.
- 3. A method as claimed in claim 2, wherein the non-differentiated read digital signal in addition is directly fed to another threshold detector so that drop-outs having a very small signal-to-noise ratio can be detected.
- 4. A method as claimed in claim 1, wherein the individual pulses of the read and rectified digital signal are fed to a large number of adjustable threshold stages and the differential of the envelope is determined by comparing the amplitudes of successive ones of said resulting pulses.
Priority Claims (1)
Number |
Date |
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Kind |
3238077 |
Oct 1982 |
DEX |
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Parent Case Info
This is a division, of application Ser. No. 6,540,385 filed Oct. 11, 1983, allowed Oct. 1, 1986, now U.S. Pat. No. 4,656,420.
US Referenced Citations (10)
Divisions (1)
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Number |
Date |
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Parent |
540385 |
Oct 1983 |
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