Digital Terrestrial TV to North American ATSC Standard - Digital Video and Audio Broadcasting Technology - page 431

tained. If the Nyquist slope is not properly adjusted, amplitude frequency
response at low frequencies will be the consequence.

Lower
sideband

Upper
sideband

f

Carrier
frequency

Carrier

Fig. 23.3. 8ASK modulation at RF domain

Vestigial
sideband
(VSB)

upper
sideband

VSB
filter

f

Carrier
frequency

Carrier

Fig. 23.4. Vestigial sideband filtering

Receiver filter
with Nyquist
slope

Upper
sideband

f

Carrier
frequency

Fig. 23.5. IF filtering with Nyquist slope