Tvheadend

A TV tuner for North American TV standards that supports ATSC and QAM shows up in tvheadend web interface as:

Device LG Electronics LGDT3305 VSB/QAM Frontend : DVB-C #0
Device LG Electronics LGDT3305 VSB/QAM Frontend : ATSC #0

I believe it would be more correct to call the cable tuner as "QAM #0" (or J83 ANNEX B #0) as DVB-C clearly points to the European cable standard.

http://en.wikipedia.org/wiki/QAM_%28television%29

Here's the dvb-fe-tool output of the tuner:

INFO Device LG Electronics LGDT3305 VSB/QAM Frontend (/dev/dvb/adapter1/frontend0) capabilities:
INFO CAN_8VSB
INFO CAN_INVERSION_AUTO
INFO CAN_QAM_64
INFO CAN_QAM_256
INFO DVB API Version 5.10, Current v5 delivery system: ATSC
INFO Supported delivery systems:
INFO [ATSC]
INFO DVBC/ANNEX_B