Capturing from LaserDisc (audio question)

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Has anyone captured from LD? What do you guys do with audio? LDs have digital
audio so I'd like to take advantage of it and convert it using S/PDIF coaxial
cable during my video capture. But I can't figure out the source's sampling
rate. My soundcard is M-Audio Audiophile 24/96.

--Leonid

 

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Actually, all the LD's I own have ANALOG audio, digitized
for the production of the LD (A-A-D). The original (film) soundtrack was
probably never pure digital, and is not advertised as such.

Just cap it as analog, you will likely never hear
the difference, and life will be simple.

"Leonid Makarovsky" <venom@cs.bu.edu> wrote in message
news:c5bpnd$604$2@news3.bu.edu...
> Has anyone captured from LD? What do you guys do with audio? LDs have
digital
> audio so I'd like to take advantage of it and convert it using S/PDIF
coaxial
> cable during my video capture. But I can't figure out the source's
sampling
> rate. My soundcard is M-Audio Audiophile 24/96.
>
> --Leonid

 

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Vance Green <vancegrn@nowhere.net> wrote:
: Actually, all the LD's I own have ANALOG audio, digitized

So wait a sec. The analog audio means that is not like on regular CD -
CD is digital.

: for the production of the LD (A-A-D). The original (film) soundtrack was
: probably never pure digital, and is not advertised as such.

: Just cap it as analog, you will likely never hear
: the difference, and life will be simple.


Yeah, on my LDs it says Digital Audio. When I press Digital for my LD player,
the sound is actually much louder.

--Leonid

 

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"Leonid Makarovsky" <venom@cs.bu.edu> wrote in message
news:c5bues$3p7$1@news3.bu.edu...
> Vance Green <vancegrn@nowhere.net> wrote:
> : Actually, all the LD's I own have ANALOG audio, digitized
>
> So wait a sec. The analog audio means that is not like on regular CD -
> CD is digital.

That doesn't really matter if the ORIGINAL track
from which it was created/digitized was analog. That's
what I'm getting at. It MIGHT make a difference
(again probably not detectable with your ears) if
the original soundtrack of the movie was digital
to begin with. Most aren't, due to the vintage
of LD's.

>
> : for the production of the LD (A-A-D). The original (film) soundtrack
was
> : probably never pure digital, and is not advertised as such.
>
> : Just cap it as analog, you will likely never hear
> : the difference, and life will be simple.
>
>
> Yeah, on my LDs it says Digital Audio. When I press Digital for my LD
player,
> the sound is actually much louder.

Advertising hype. See above. Just cuz' the audio track is composed
of bits does NOT make it digital. It needs to be D-D-D (digitally RECORDED,
digitally MIXED/MASTERED, digitally DISTRIBUTED) to be
pure digital, from my understanding of what what I've read.

How does the captured analog audio sound?
Have you tried it? You certainly have the hardware necessary
for the best possible results.

>
> --Leonid

 

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Leonid Makarovsky <venom@cs.bu.edu> wrote:
> Vance Green <vancegrn@nowhere.net> wrote:
> : Actually, all the LD's I own have ANALOG audio, digitized
>
> So wait a sec. The analog audio means that is not like on regular CD -
> CD is digital.
>
> : for the production of the LD (A-A-D). The original (film) soundtrack was
> : probably never pure digital, and is not advertised as such.

No, Vance was talking about the Spar code. A-A-D means it was recorded
in analog, mixed in analog, and digitally mastered.

For films of the era when LDs were big, most would have been recorded
and mixed in analog, so naturally any LD produced would by A-A-D.

If I recall correctly, LD digital audio tracks are 16 bits/44.1 kHz (same
as CD). [a quick web search verifies this]

Some LDs, particularly Criterion Collection and other special editions,
would use the digital audio tracks for the movie soundtrack and the
analog audio tracks for commentary.

LDs with Dolby Digital replace the spectrum occupied by one of the analog
tracks with a modulated digital signal [web search says right channel].
LDs with DTS puts the DTS encoded audio in place of the PCM coded audio
in the digital audio tracks.

 

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Vance Green <vancegrn@nowhere.net> wrote:
: That doesn't really matter if the ORIGINAL track
: from which it was created/digitized was analog. That's
: what I'm getting at. It MIGHT make a difference
: (again probably not detectable with your ears) if
: the original soundtrack of the movie was digital
: to begin with. Most aren't, due to the vintage
: of LD's.

My LD is a 1990 live music show.

: Advertising hype. See above. Just cuz' the audio track is composed
: of bits does NOT make it digital. It needs to be D-D-D (digitally RECORDED,
: digitally MIXED/MASTERED, digitally DISTRIBUTED) to be
: pure digital, from my understanding of what what I've read.

: How does the captured analog audio sound?
: Have you tried it? You certainly have the hardware necessary
: for the best possible results.

Ok, I played with it a little bit.

I plugged analog RCA out to my soundcard (M-Audio). I also plugged S/PDIF out
to my M-Audio S/PDIF in. I played LD. LD had analog mode.

The S/PDIF portion sounded perfectly. To my ears it was better than analog
portion. Then I put digital mode so that LD was outputting analog signal that
it was converting from digital track. SPDIF didn't change at all (well it's
digital to digital so it shouldn't change). The digital2andalog was louder than
S/PDIF and than just analog. I found S/PDIF track actually a bit better. So I
guess there're 2 tracks analog and digital stored on LD.

I'll try to do video capture with S/PDIF at 44,100kHz and then I'll convert
it to 48000kHz with SSRC during the DVD creation.

--Leonid

 

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Samuel Paik <sam@paiks.org> wrote:
: No, Vance was talking about the Spar code. A-A-D means it was recorded
: in analog, mixed in analog, and digitally mastered.

It doesn't say this on LD. It does say digital audio. This LD is made in
Japan in 1990.

: For films of the era when LDs were big, most would have been recorded
: and mixed in analog, so naturally any LD produced would by A-A-D.

: If I recall correctly, LD digital audio tracks are 16 bits/44.1 kHz (same
: as CD). [a quick web search verifies this]

: Some LDs, particularly Criterion Collection and other special editions,
: would use the digital audio tracks for the movie soundtrack and the
: analog audio tracks for commentary.

: LDs with Dolby Digital replace the spectrum occupied by one of the analog
: tracks with a modulated digital signal [web search says right channel].
: LDs with DTS puts the DTS encoded audio in place of the PCM coded audio
: in the digital audio tracks.

So wait a sec. I'm still confused. When you say that there's an analog track
on LD, do you mean 16 bits/44.1kHz? Is it all digital? Or is it analog-analog
like on VHS, cassettes but just stored differently?

--Leonid

 

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Leonid Makarovsky <venom@cs.bu.edu> wrote:
> So wait a sec. I'm still confused. When you say that there's an analog track
> on LD, do you mean 16 bits/44.1kHz? Is it all digital? Or is it analog-analog
> like on VHS, cassettes but just stored differently?

No. Laserdiscs are essentially a modestly broadband ANALOG storage
media. The analog audio channels are frequency modulated (I think)
into the signal. The digital audio channels are encoded into the analog
signal in a manner very similar to how digital data is encoded by a
modem onto a telephone line.

 

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Leonid Makarovsky <venom@cs.bu.edu> wrote:
: Has anyone captured from LD? What do you guys do with audio? LDs have digital
: audio
(snip)

*SOME* LDs have digital audio.

I gave up on Laser Discs because putting 5.1 digital audio on a LD meant
that the analog audio track was MONO! (my player didn't support digital)

Richard in Boston, MA,USA

 

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Richard G Amirault <amirault@shell01.TheWorld.com> wrote:
: I gave up on Laser Discs because putting 5.1 digital audio on a LD meant
: that the analog audio track was MONO! (my player didn't support digital)

I'm also giving up on LDs that's why I transfer what is not available on DVDs
to DVDRs. In my case LDs are 2 channel stereo.

--Leonid