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Video signal dropout detector
| Details |
Inventors: Abuali, Khaled Amin; Yazurlo, Donato;
Assignee: Sony Corporation (Tokyo, JP); Sony Electronics Inc. (Park Ridge, NJ)
Primary Examiner: Powell; Mark R.
Assistant Examiner: Sajous; Wesner
Attorney, Agent or Firm:
A method and apparatus for detecting video signal dropout. The method includes the step of generating a video signal, and then electronically isolating at least one component of the video signal. The at least one component is representative of the absence of the video signal itself. Next, the absence of the at least one component is electronically sensed. The step of electronically isolating can include the step of passing the video signal through a comb filter, and in particular isolating a luminescence signal from the video signal. The step of electronically isolating can also include passing the video signal through a sync separator. The step of electronically sensing can include passing the at least one component through a comparator. The method can also include the step of generating the video signal for a predetermined time duration, and simultaneously generating an audio signal to indicate the end of the predetermined time duration. In this embodiment, the step of electronically sensing is then terminated in response to the audio signal. |
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DETAILED DESCRIPTION OF THE INVENTION While this invention is susceptible of embodiment in many different forms, there is shown in the drawings, and will herein be described in detail, exemplary embodiments, with the understanding that the present disclosure is to be considered as illustrative of the principles of the invention and not intended to limit the invention to the exemplary embodiments shown and described.
Turning now to FIG.
1, a video signal dropout detector 10 is shown in block diagram.
The detector 10 is adapted for connection to a device under test 12 which is a source of video and audio signals which may, for example, be a VCR, camcorder, or other piece of video equipment.
Signals from the source 12 are transmitted to an isolation assembly 14.
The isolation assembly 14 is used to isolate at least one signal component from a video signal generated by the video signal source 12, as will be described in greater detail with reference to FIG.
2.
The at least one signal component is selected such that an interruption in the at least one signal component corresponds to a dropout of the video signal generated by the video signal source.
The signal component from the isolation assembly 14 is then transmitted to a sensing device 16.
The sensing device 16 is equipped to sense an interruption in the at least one signal component, as will be described in greater detail with reference to FIG.
2.
Signals from the sensing device 16 are then transmitted to a detector output destination device 18, which can be provided to store, process, or display the output of the sensing device.
An embodiment of video signal dropout detector 10 is shown in greater detail in FIG.
2.
The signal source 12 includes an audio source 20 and a video source 22.
In the preferred embodiment, a test tape is utilized which provides predetermined audio signals used to signal the beginning and end of the test as well as video test signals.
Preferably, the video test signal is a green raster which provides for high levels of luminance
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Television 
