Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1990-01-30
1992-04-07
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
G11B 2736
Patent
active
051033500
ABSTRACT:
An apparatus for automatically sorting out a defectively signal-recorded cassette videotape. A series of video signals recorded on the videotape by means of frequency modulation is amplitude-detected to obtain a normally constant DC output. If the DC output, which is compared with a predetermined reference voltage by a comparator, shows a voltage drop deeper than a value defined by the above predetermined reference voltage for a predetermined period of time, the video signals are judged to be recorded defectively, and the cassette videotape is discharged from the apparatus. As to sound signals also, if they are recorded in the form of frequency modulation for Hi-Fi recording, defective recording of the sound signals is judged in a manner similar to the above. However, if sound signals are recorded as they are without being modulated, the audio frequency sound signals is converted to pulse signals by a Schmitt circuit whose trigger level is set at a level corresponding to an audible minimum amplitude of the sound signals. With the Schmitt circuit thus adjusted, if the pulse signals outputted from the circuit pauses for a predetermined period of time, the sound signals are judged to be defectively recorded, and the cassette videotape is discharged from the apparatus.
REFERENCES:
patent: 4746991 (1988-05-01), Efron et al.
Jyonan Denki Kogyosho, Co., Ltd.
Psitos Aristotelis
Sheladia Varsha V.
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