Sorry I wasn't more explicit. I have a Macbook Air less than a year old which has a mini display port. I have a mini display port/thunderbolt adapter (with audio) and high speed HDMI cable. ( I may eventually get an Apple TV). My TV has a HDMI port as well as audio ports. ( My problem is not with the connecting. I need to know if my present TV set-up is adequate. I have a fairly new HD TV. However I do not, at present, receive HD via my ISP. I do not have a HD receiver, just a standard digital receiver. Do I need to upgrade to HD for this connection to work? Sorry, I am not very technically literate!
If you're talking about the cable signal you receive, that will have nothing to do with connecting your MBA to your TV. Are you wanting to use your TV as a 2nd screen or alternate screen? As member bobtomay mentioned, what method/cable you use will depend on your devices.
As MmR noted, connecting your Mac to your TV has nothing whatsoever to do with any other external source you may be connecting to the TV. (Unless you don't have enough HDMI ports and need to unplug one device in order to plug in another.)
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