A Conversation for Recording Techniques - Digital versus Analogue

Sampling Frequency

Post 1

manolan


I thought the sampling frequency of CD audio was 44.1kHz, not 41kHz.

Also, in the section "Bits and Pieces", you refer to 4-bit encryption, whereas what you're referring to is 4-bit encoding.


Sampling Frequency

Post 2

manolan


Oh, and of course, DAT has a different sampling frequency (48kHz).


Sampling Frequency

Post 3

Jose Minge, Chair and Keeper of The Imperial Deafness, don't you know.

OK, I originally put encoding, but was told by the author of Fourier analysis entry that this was the wrong terminology to use. As for the mistake to do with CD sampling rate I don't have an answer, it was probably my mistake not the editors though.

48kHz is used by both DAT and some MIDI programs. It gives more clarity but takes more space to store than 44.1kHz. DAT has better clarity, but as you are still relying on a mechanical process you still get some noise from the DAT machine this' and because they are quite annoying to use (apparently), is why they have been superceded by CD and mini disc.


Sampling Frequency

Post 4

GTBacchus

so, um.... is there anything in here that needs to change?


Sampling Frequency

Post 5

Jose Minge, Chair and Keeper of The Imperial Deafness, don't you know.

Yes, erm my fault entirely I should have proof read, bugger. Where it says (something like) 'CD's use 16 bit encryption and a sampling rate of 41000Hz' it should be 44100 Hz instead. Sorry.


Sampling Frequency

Post 6

Jose Minge, Chair and Keeper of The Imperial Deafness, don't you know.

How Digital Audio Is Recorded

This is going to be quite hard to explain, but here goes!

Digital audio works by sampling sound into binary code. To save space and simplify the process the sound is usually encoded into 16-bit PCM (pulse code modulation) and sampled at 41,000Hz. This is the configuration most commonly used for compact discs.


Should be:

How Digital Audio Is Recorded

This is going to be quite hard to explain, but here goes!

Digital audio works by sampling sound into binary code. To save space and simplify the process the sound is usually encoded into 16-bit PCM (pulse code modulation) and sampled at 44,100Hz. This is the configuration most commonly used for compact discs.


Sampling Frequency

Post 7

Potholer

While you're at it, the ' 220,500Hz ' in the 'How digital audio is recorded' section looks suspect.
I *guess* it was meant to be 22,050 or thereabouts (ie half the CD sampling rate of 44.1KHz)?


Sampling Frequency

Post 8

World Service Memoryshare team

OK Jose Minge, I've done that change smiley - ok Thanks for clearing it up.

Potholer, you sound like you know what you're talking about... Jose Minge, do you want to confirm?

smiley - smiley

Anna


Sampling Frequency

Post 9

GTBacchus

Hi Anna, good morning! smiley - smiley

Thanks for helping out with this... there's actually another spot where the incorrect 41,000 number shows up. Under the header "Which is Better?", in the first paragraph, there's the parenthetical: "(1/41,000th of a second)". That should be "(1/44,100th of a second)".


Sampling Frequency

Post 10

World Service Memoryshare team

Morning to you GTB!

Is done smiley - smiley

Anna


Sampling Frequency

Post 11

Jose Minge, Chair and Keeper of The Imperial Deafness, don't you know.

Yes thankyou, sorry should proof read stuff.


Sampling Frequency

Post 12

GTBacchus

Say Jose, how about the 220,500 that Potholer mentioned in post 7?


Sampling Frequency

Post 13

Jose Minge, Chair and Keeper of The Imperial Deafness, don't you know.

Potholer is correct, the 22,050 Hz is half CD sampling rate. THis is correct.


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