When developing equipment or during {TAIL ~ production} of equipment, especially digital or analog video and audio transmitters and receivers, it would be useful to test the equipment, or at least parts of the equipment, using {HEAD ~ actual signals} such as sample audio or video signals that jitter 
When developing equipment or during { TAIL ~ production } of equipment , especially digital or analog video and audio transmitters and receivers , it would be useful to test the equipment , or at least parts of the equipment , using { HEAD ~ actual signals } such as sample audio or video signals that jitter
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