Analog Television - Digital Video and Audio Broadcasting Technology - page 17

Sync) signal. Fig. 2.9. shows the CCVS signal of a color bar signal. The
color burst can be seen clearly. It is used for conveying the reference phase
of the color subcarrier to the receiver so that its color oscillator can lock to
it.

CVBS

AM VSB

f

+

Audio 1

FM 1

Audio 2

FM 2

VSB = vestigial
side band filter

Fig. 2.10. Principle of a TV modulator for analog terrestrial TV and analog TV
broadband cable

2.4 Transmission Methods

Analog television is disseminated over three transmission paths which are:
terrestrial transmission paths, via satellite and by broadband cable. The
priority given to any particular transmission path depends greatly on the
countries and regions concerned. In Germany, the traditional analog “an-
tenna TV” has currently only a minor status with fewer than 10%, this
term being used mainly by the viewers themselves whereas the actual
technical term is “terrestrial TV”. The reason for this is the good coverage
by satellite and cable, and more programs. This will change when DVB-T
is introduced as has already become apparent in some regions.
Transmission of analog television via terrestrial and satellite paths will
shrivel away into insignificance within a few years. Whether this will also
be true of broadband cable cannot yet be predicted.
In the terrestrial transmission of analog TV signals, and that by cable,
the modulation method used is amplitude modulation, in most cases with