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What is the PCM expresion

 

TATABOCA
Unregistered guest
what is the PCM expression and it does what?
Is it better to have it in your DVD player as
set to ON or OFF

 

Silver Member
Username: Samijubal

Post Number: 707
Registered: Jul-04
LPCM is uncompressed audio, like a CD. Not many discs use PCM, most DVDs are Dolby Digital. Some concert DVDs and some low budget DVDs use PCM, that's about all.
 

Silver Member
Username: Dmwiley

Post Number: 146
Registered: Feb-05
David, this is way off topic but could you kindly fill me in on this PANSAT stuff? I gather it is a satellite receiver of some sort. Would you be kind enough to give me the beginner's course? Thanks.
 

Silver Member
Username: Samijubal

Post Number: 710
Registered: Jul-04
I'm guessing you are talking about the receivers that pick up the Dish Network channels for free? Pansat also makes MPEG-2 receivers. If you mean the Dish Network ones I've never used them, just heard of them. Here is a site in Canada that sells them, a friend gave me this a month or two ago. www.sat-toys.com/index2.shtm1
Supposedly all the receivers are made by the same company, I don't know if that's true or not, I think I read that here.
 

Silver Member
Username: Dmwiley

Post Number: 148
Registered: Feb-05
Interesting. Thanks.
 

Allan Brown
Unregistered guest
PCM stands for "Post Code Modulation". It is a system where the signal is sampled as it is sent and resampled at the same rate at the other end. This is then formed into the original signal. Mostly used in telecommunications these days on the digital network as it enables hundreds of telephone calls to be sent on one line at the same time.
 

Silver Member
Username: Arnold_layne

MadridSpain

Post Number: 353
Registered: Jun-04
Back to the original question: DVD player gives you the possibility to convert Dolby Digital, DTS and/or MPEG to PCM before sending it via digital outputs. It is meant to be used if your receiver/amplifier is not DD/DTS/MPEG compatible.

Some further info on PCM ("Pulse Code Modulation"): It consists of a n-bits sample, produced at a certain frequency. Examples (bits/KHz for each stereo channel):

Broadcasting (NICAM): 14 bits at 32 KHz.

CD: 16 bits at 44.1 KHz

DVD-Video: often 16 or 24 bits at 48 KHz (96 KHz audio is rare but supported).

DVD-Audio: up to 24 bits at max 192 KHz. This format handles up to 6 channels at max 24 bits/96 KHz.

So PCM is a flexible format, spanning from space-/bandwidth-saving low-fi audio to audiophile music. It is also scalable, and therefore "easy" to convert and manipulate.

Cheers
AL
 

Silver Member
Username: Dmwiley

Post Number: 272
Registered: Feb-05
I thought it was "pulse" code modulation. But I guess I am wrong about that. Thanks for the info.
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