Can a PC TV Tuner work for a digital set top box?

I am planning on getting a TV tuner for my Windows computer (at lowest something I can connect a VCR up to, but can also record live TV), and there's an external one available at Staples/Business Depot, but it say it requires an antenna or analogue cable source. I have neither (I own a digital set-top box). Can I still use a tuner card, or do I need to catch analogue cable or an antenna?

Answer:
In your case, you'll only just end up bypassing the TV tuner on the PCI card, using the Composite or S-video INputs the card have to offer.

Keep shifting channels on your cable-box, and hook the video outputs contained by the back of the box into your TV tuner. The audio cable should go into your soundcard.
You may hold a digital set top box, but the signal it sends to the TV (unless it is digital too) is analog, usually. So hooking it up to the tuner card should work just alike. You may not have impossible to tell apart functionality, but probably will.
It can work as an analog set top box, but not a digital set top box. You need the cable set top box to read the channels. Without the set top box, you would simply be stuck with 75 channel. With the set top box, you will get the full 200+ channel that you ordered.

You would use your set top box remote to change the channel. You are using the TV tuner card as a tv tuner rather than a cable tuner.
There are TV tuner cards that enjoy IR blasters that stick onto the front of the cable box where the IR addressee is, this will send IR nouns to the cable box to change channel.

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