A continuous signal varying between two extreme values that is proportional to the physical mechanism that created it.
The amount of charge that can be stored on a body per unit electric potential.
Charged coupled device (CCD)
A device where incident light from an object causes the build-up of electric charge in individual pixels producing an image of the object. The amount of charge is proportional to the intensity of the light.
A number in a binary sequence.
Least significant bit (LSB)
The number in a binary sequence that represents the lowest power of 2.
Most significant bit (MSB)
The number in a binary sequence that represents the highest power of 2.
When a beam reflects from the edge between a land and a pit on a CD/DVD, destructive interference takes place and a weak signal is received.
A coded signal that can have one of two values (0 or 1).
Ratio of length of the image on a CCD to the length of the object.
A mediums ability to create a copy.
The rate at which data can be retrieved from the medium.
Density of information in a medium.
Part of the surface of a CCD. Converts light energy into electrical energy using the photoelectric effect.
The ratio of the number of electrons emitted to the number of incident photons on a pixel.
Optical process used to photograph a large number of original documents to be held miniaturized form.
Manipulation of data
Ability to edit data on a given medium.
Two points on an object may be just resolved on a CCD if the images of the points are at least two pixels apart.
Phonographic records. Sound variations stored as variations in a track. Analogue.
Sound variations stored as variations in the magnetic fields in the tape. Analogue.
Different characters stored as variations in the magnetic fields in the disk. Digital.
Variations stored in the magnetic fields in the disk. Digital.
Variations of light and sound are stored as series of optical bumps and pits on a DVD track. Digital.
Insulating layer between two conducting plates in a capacitor.