Okay so I have this HDTV that supports several different inputs. One input is for your standard composite cables, the second is for component cables, another one is a VGA port with audio input, and the last is for an HDMI cable and audio input. My question is, if an HDMI cable already transmits both video and audio to the TV (I tested it with my xbox 360) then why is there a need for the seperate audio input?
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Friday, November 20th, 2009 at 4:48 am
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November 20th, 2009 at 11:49 am
BEFORE HDMI…there was DVI. DVI was Video only input, and had a separate audio connector.
DVI was only out for a year, when they redesigned the connector to include Audio with the Video signal. Thus HDMI was born
The DVI signal is actually the same video as HDMI uses…So, if you have an older Cable box with DVI output, you can connect it to your HDMI input with a DVI to HDMI adaptor, and use an HDMI cable to deliver video to your TV set.
Then you use an RCA cable to get audio to your TV set.
While DVI is rare, it’s smart to include the connection on TV sets.
November 20th, 2009 at 11:49 am
HDMI (and antenna) is the only type of hookup that combines video and audio in one cable.
All those other connection types (composite, component, etc) must also have matching audio inputs or the TV speakers would be silent.
In fact - does the TV have an optical output for the HDMI jack? Yes - output.
HDTV uses 5.1 sound just like a DVD. But does your TV have 5.1 speakers? No. To solve this, many HDTV’s have an optical output that you use to feed an external audio system.
Without this - you are missing the glorious (and often aggressive) rear sounds from shows like Terminator and Dollhouse.
November 20th, 2009 at 11:49 am
HDMI came in more than one wave. The first HDMI didn’t carry audio over the cable. HDMI 1.3 is video and audio over the same cable. So if someone had an early edition HDMI port on a device, they’d need dedicated audio ports for the HDMI still. That’s why you want to get an HDMI 1.3 rated cable.
Second, as has already been mentioned, its handy if you want to use DVI. In today’s day and age, with people downloading videos and what not, there are more and more people hooking up computers to TVs. So if your computer has DVI out you buy a DVI to HDMI cable. But DVI is audio only (as has been stated). So now that HDMI port only has video feeding it, so again, we need the audio ports associated with it, so we can still carry audio to the TV. More and more computers are getting HDMI out ports on them, but its still not “the norm,” so the DVI to HDMI situation is quite common.
November 20th, 2009 at 11:49 am
that way you can still have audio if you do not have something hdmi compatible