about ac3

[matriplex]

what is 5.1 surrond? is it 5+1=6 speaker? and do we have to have 6 speakers to listen ac3 encoded files?

[MOVIEGEEK]

5.1=
2 front
2 rear
1 center
1 lfe(subwoofer)

If you do not have a surround speaker system then your player will downsample to 2 channels.All DVD players support AC3 and a PC will if you have the codec installed.

[matriplex]

thanks for the answer but I want to ask more what is lfe (subwoofer) I looked at dictionary but I couldn't find

[ZippyP.]

Subwoofer explained.

[matriplex]

I want to ask a question but fistly I want to name speakers.
center:C left:L right:R left surround:LS right surround:RS
1-can L and R give different voices at the same time?
2-can c and R give different voices at the same time?
3-can c and RS give different voices at the same time?
4-can R and RS give different voices at the same time?
5-can LS and RS give different voices at the same time?

[yoda313]

With digital surround sound you can do any combination. You can have one voice coming out of each speaker independently. Meaning you could have five voices coming out simultaneously plus a low frequency beat out of the subwoofer.

[matriplex]

thanks yoda313 for the answer.

you say that I can do any combination. İt means ''yes'' to all questions.
is there any program you know which can edit ac3.encoded files.

[mats.hogberg]

No, you can't edit AC3 directly. Each channel has to be decoded to wav, edited (separately or in a 6 track audio editor) then encoded back to 5.1 AC3
There may be applications that do the decoding/encoding "transparently" - Take a look at Sonic Foundry - there's a 5.1 plugin for it. A bit pricey tho...

/Mats

[jsmithepa]

AC3 does not necessarily means dolby 5.1, even though often they go together. They are two different things.

AC3 is a digital delivery "container" meant to deliver whatever audio content to your receiver (stereo) via a digital (optical or RCA) hookup.

AC3 can contain (most popular) Dolby 5.1, Dolby 6 (Pro-logic), PCM 2.0 (plain stereo), DTS.

U couldn't find subwoofer in dictionary? <gasp> Try Wiki.com.

[MOVIEGEEK]

"AC3 does not necessarily means dolby 5.1, even though often they go together. They are two different things."

False...Dolby is always AC3. 5.1 can be Dolby,DTS or PCM.

"AC3 is a digital delivery "container" meant to deliver whatever audio content to your receiver (stereo) via a digital (optical or RCA) hookup."

True as long as it's Dolby.

"AC3 can contain (most popular) Dolby 5.1, Dolby 6 (Pro-logic), PCM 2.0 (plain stereo), DTS."

False...AC3 is always Dolby,DTS and PCM are different.

http://en.wikipedia.org/wiki/Dolby_Digital

[jdehn]

thanks for the answer but I want to ask more what is lfe (subwoofer) I looked at dictionary but I couldn't find

lfe=Low Frequency Effect