TV Tuner

A TV tuner card is a computer component that allows television signals to be received by a computer. Most TV tuners also function as video capture cards, allowing them to record television programs onto a hard disk.
Variants
TV tuners are available in a number of different interfaces: as PCI-bus expansion card, PCIe (PCI Express) bus or USB devices. Ethernet-connected devices also exist.(HDHomeRun) In addition, some video cards double as TV tuners, notably the ATI All-In-Wonder series. The card contains a tuner and an analog-to-digital converter (collectively known as the analog front end) along with demodulation and interface logic. Some very cheap cards lack an onboard processor and, like a Winmodem, rely on the system's CPU for demodulation.
There are currently four kinds of tuner card on the market:
· Analog TV tuners
· Digital TV tuners
· Hybrid tuners
· Combo tuners