technoguy

DEffination ::Analog television (or analogue television) encodes television picture and sound information as an analog signal, that is, by varying the amplitude and/or frequencies of the signal. All systems preceding digital television can be considered analog.An analog television picture is drawn on the screen an entire frame each time, in the manner of a motion picture (cinematograph) film, irrespective of the picture content. Using NTSC (or PAL/SECAM) analog encoding and modulating onto a VHF or UHF carrier is a highly effective way of distributing an analog television picture, whereas attempting to distribute the same content in a native uncompressed digital form (as Digital Audio Compact Disc 'CD' is) would require an approx 250 G bit/s data rate, which is many times in excess of the bandwidth taken by a standard analog UHF channel.