Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1976-12-23
1978-07-18
Richardson, Robert L.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
H04N 579
Patent
active
041019407
ABSTRACT:
A composite input video signal, having blanking intervals and including line sync pulses increasing the amplitude of the input signal, is applied to the circuit, is amplitude filtered, and is split into a BA-signal, which is fed to an adding stage, and line sync pulses which are fed to a monostable multivibrator which converts the line sync pulses into output pulses having an amplitude within the amplitude range of the filtered video signal, and these output pulses are also supplied to the adding stage. The output of the adding stage is applied to the input of a storage controlled by a timing pulse sequence from a timing pulse generator. The output pulses of the monostable multivibrator are supplied to a phase comparator having an input connected to the output of the storage through a gating device. The phase comparator supplies a variable to the timing pulse generator to control its frequency. The gating device transmits only during the line blanking interval A of the BA-signal, and thus transmits only the added multivibrator output pulses supplied to the input of the storage. The multivibrator output pulses and the video signal BA coincide, in time, at both the input and the output of the storage, so that the storage effects a delay exactly equal to the respective duration of a line.
REFERENCES:
patent: 3483318 (1969-12-01), Iwai et al.
Richardson Robert L.
TED Bildplatten Aktiengesellschaft AEG-Telefunken-Teldec
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