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DVCPRO - New digital format

Decibel (dB) One decibel is one tenth of a Bel and is used to measure audio and video sig-

nals expressed by the ratio of two amounts of electric. It is also used to measure power dif-

ferences in voltage, current, watts and sound pressure.

Depth of Field The front to back zone in a field of view, which is in focus in the televised

scene. With a greater depth of field, more of the scene, near to far, is in focus.

Detail Resolution or clarity of the picture.

Drop Frame A type of time code that can be used as a real time reference.

Error Concealment Use to conceal errors in digital recorded.

Fade Used in editing to gradually increase or decrease the video signal from black. Fading

in is from black to full strength and fade out is from full strength to black.

Field One half of a scanned image. A field can be referred to as an odd field or an even

field. Each field is made up of 262 1/2 lines. There are two fields per frame and 60 fields per

second.

Two fields make up a complete television picture (frame). The lines of Field 1 are vertically

interlaced with Field 2 for 525 lines of resolution.

Flying Erase Head A special video erase head that allow for cleaner edits.

F Number In lenses with adjustable irises, the maximum iris opening is expressed as a ra-

tio, (focal length of the lens) (maximum diameter of aperture).

Focal Length The distance from the center of the lens to a plane at which point a sharp im-

age of an object viewed at an infinite distance from the camera is produced. The focal

length determines the size of the image and the angle of the field of view seen by the cam-

era through the lens. That is the distance from the center of lens to the pickup device.

Foot Candle The amount of light reflected by a white surface one foot away from a lit can-

dle. The metric equivalent is the lux.

Foot Lambert One lumen or one foot candle of light over a one square foot surface.

Format In recording of video, C, U-Matic, Betacam, M, Betacam SP, M-II, D1 D2, D3, D5,

DV, DVCPRO, Beta, VHS, Hi8, 8mm and S-VHS are all current formats.

Frame The combination of an odd and even field of the video signal. In each frame of video

there are 525 lines of information in the NTSC system. There are thirty frames in a second.

(625 lines, 1/25 sec. in Europe and many other countries).

Frame Rate The amount of frames per second that has been set up for a particular televi-

sion system. Black and white television uses a thirty frame per second rate, while color tele-

vision uses 29.97 frames per second rate.

Frequency Response The frequency range that both audio or video systems can repro-

duce a signal within a stated amplitude range.

Front Porch That period of time during horizontal blanking that starts from the end of the

scanned video image and goes to the horizontal sync pulse.

Gain The amplification of a unit.

Gray Scale A series of tones, which range from true black to true white, it is usually ex-

pressed in 10 steps.

HDTV High Definition Television

Hz Hertz

Head The parts of a tape machine that play back or record signals on the tape.