Analog Television uses a traditional broadcasting and
recording signal that imitates an image/sound by continuous wave frequency
increases and decreases. Measured in hertz (see above), theoretically it is an
efficient form of information transmission but suffers from a high signal
to noise ratio. This produces interference on both the picture and the
sound. Our fifty year old analog systems have been fully built
out and will not support future expansion.
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Digital Television uses a discrete
interval signal that does not imitate a phenomenon but translates the
image/sound into ones and zeros. This efficient format is
similar to computers. Measured in bits (see above),
it has a thousand times lower signal to noise ratio. In other words, less
interference with television picture and sound.
