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Overhead projector in operation during a classroom lesson. An overhead projector (often abbreviated to OHP), like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience.
Hardware Based Audience Response: The presenter uses a computer and a video projector to project a presentation for the audience to see. In the most common use of such Audience Response systems, presentation slides (built with the Audience Response software) display questions with several possible answers, more commonly referred to as multiple choice questions.
Projection screen in a movie theater Home theater projection screen displaying a high-definition television image. A projection screen is an installation consisting of a surface and a support structure used for displaying a projected image for the view of an audience.
Mobile has the best audience accuracy and is the only mass media with a built-in payment channel available to every user without any credit cards or PayPal accounts or even an age limit. Mobile is often called the 7th Mass Medium and either the fourth screen (if counting cinema, TV and PC screens) or the third screen (counting only TV and PC).
Last year's record audience of 123.4 million viewers watched the Chiefs top San Francisco 49ers in a narrow 25-22 victory in only the second Super Bowl overtime game in history.
The screen is in front of, and usually below, the lens of a professional video camera, and the words on the screen are reflected to the eyes of the presenter using a sheet of clear glass or other beam splitter, so that they are read by looking directly at the lens position, but are not imaged by the lens. Light from the performer passes through ...
By comparison, last year’s Super Bowl between the Chiefs and the Philadelphia Eagles set the all-time record with an average audience of 115.1 million viewers across Fox’s networks and platforms.
The user interface for early telestrators required the user to draw on a TV screen with a light pen, whereas modern implementations are commonly controlled with a touch screen or a graphics tablet. The late NFL color commentator John Madden famously used a telestrator during football games for many years, boosting the device's popularity. [ 5 ]