A camcorder is a video apparatus for storing video images on a recording medium and replaying the stored images on a display. A camcorder has the function of a general video camera for imaging an object as well as the function of a video recorder for recording the image of the object. Camcorders are self-contained camera recorder units which allow recording video images and audio of live events onto a storage device. Camcorder utilizes circuitry and optics in an attempt to achieve recording capabilities comparable with professional video equipment. It includes a camera which converts light images into electrical video signals. A processor
coupled to the camera converts the electronic video signals into a low bandwidth frequency modulated storage signal with the bandwidth substantially lower than in a standard television
video signal. A recorder coupled to the processor stores the low bandwidth frequency modulated storage signal on an audio cassette, which has a standard speed allowing storage of an audio bandwidth signal.
Recording of a camcorder is performed beginning with selection of a recording button by the user upon power-on of the camcorder. The user begins to record a desired image, keeping a certain distance from the image, using the camcorder and then pushes a stop button on the camcorder to complete the recording of the image. An interlace-scanned image sensing signal is obtained from imager and is outputted as a video signal according to a predetermined standard television system. The imager converts light into an electronic video-signal through an elaborate electronic process. The camera lens projects an image onto the imager surface, exposing the photosensitive array to light. The light exposure is converted into electrical charge. At the end of the timed exposure, the imager converts the accumulated charge into a continuous analog voltage at the imager's output terminals. The recorder is responsible for writing the video-signal onto a recording medium (such as magnetic videotape). The high bandwidth requirements require accurate optics, circuitry and tape drive
and head mechanisms for reliable functioning.
A conventional camcorder comprises a single video tape recorder deck, a camera and a viewfinder, in which a user can watch record image signals of the camera or playback signals of a video tape recorder through an external monitor. A camcorder normally has a unidirectional condenser microphone for simultaneouly sound recording. The camcorders are produced in the standard VHS, BETA and 8 MM formats used in home video cassette recording units. Camcorders can also record video on flash memory devices (in MPEG-1, MPEG-2 or MPEG-4), microdrives, small hard disks or size-reduced DVD-RAM or DVD-Rs in MPEG-2 format. Video camcorders are mainly classified analog type and digital type. In a analog camcorder, video recording and reproduction are processed in an analog regime. Analog video camcorders can not interface with any personal computer because they have a format incompatible with personal computer interface units used for digital video camcorders to interface with a personal computer. Digital video camcorders can interface with a personal computer
via a personal computer interface unit such as an RS-232C interface chip for digital video camcorders