Difference between 32 & 48 -kHz

[Marthax]

Hi All!

When importing video from a cam with Premiere, you can choose between "standard 32kHz" & "standard 48kHz". What's the difference between these two? How do I know what frequency corresponds with my video?

Thanks in advance!

Marthax

[check]

The samplerate of an audio track reflects the maximum frequency that the audio can record. A 48kHz samplerate means the maximum audio frequency can be 24kHz (well above the human audible range) and for 32kHz it's 16kHz (which is below the audible cutoff). I think you should pick 48kHz which will keep all the audible information.

[Marthax]

48kHz samplerate means the maximum audio frequency can be 24kHz Why is it /2?

[scharfis_brain]

cause of nyquist's theorem

[check]

Short answer: because that's the way it is
Long answer: http://en.wikipedia.org/wiki/Nyquist_frequency

[Marthax]

Ok, so the audio frequency should always be half the samling rate?

EDIT: What about the "Widescreen" or "Standard" choice? Which one should I go for. I've red that most movies are always recorded in widescreen, does that also apply to regular homemade video?

[check]

No, the maximum frequency can only be half the sampling rate.

WS vs standard relates to the aspect ratio of the video, google the term if you aren't familiar with it.

[Marthax]

I just recently red a lot about it, but what PAR do I strive for when importing video from a cam? Square?

[check]

It depends what aspect ratio your camera records in. Most likely this is a 4:3 AR, but if it looks vertically stretched, it may be 16:9

[Marthax]

How do I find out which PAR my cam uses?

EDIT: I found a mode that says "16:9WIDE = Off". Does that it that it's running 4:3, i.e square?

[check]

Most likely. The easiest way to tell is simply to look at the video. If it looks right in 4:3 mode, use that. If it looks right in 16:9, use that.

[gameplaya15143]

Many miniDV camcorders can record audio in either 48khz or 32khz, and also let you choose to record in widescreen.

Capture with the same settings you used to record the video.

If you used 32khz audio when recording, capture with 32khz audio.
If you recorded in widescreen, capture in widescreen (it only sets the aspect ratio, both wide and standard have the same resolution).

Chances are (unless you changed them in your camera) your video was recorded w/ 4:3 AR and 48khz audio.

[Marthax]

Yeah, I used those option and it worked out great. Thx for the help guys.