Sample - Revision history

Brad Johnson at 23:53, 29 February 2012

2012-02-29T23:53:16Z

Brad Johnson at 22:38, 26 February 2012

2012-02-26T22:38:36Z

Brad Johnson at 22:37, 26 February 2012

2012-02-26T22:37:09Z

Brad Johnson at 22:33, 26 February 2012

2012-02-26T22:33:54Z

Brad Johnson: Created page with "==Overview== The term "Sample" is used to describe a method where a constantly changing input is "observed" at one instant in time. It can also be used as a noun..."

2012-02-26T22:09:28Z

Created page with "==Overview== The term "<nowiki>Sample</nowiki>" is used to describe a method where a constantly changing input is "observed" at one instant in time. It can also be used as a noun..."

New page

==Overview==
The term "<nowiki>Sample</nowiki>" is used to describe a method where a constantly changing input is "observed" at one instant in time. It can also be used as a noun to describe the result of [[sampling]].
==Basics==
In order to record information in a form that a binary computer can process; the information must: a.) not be changing in value and b.) be of a finite resolution. The process of assigning a value of finite resolution is called quantization. Audio is typically transmitted between pieces of equipment as a voltage waveform that is constantly changing over time. It will have a finite voltage range; so as long as the quantization is sufficiently "fine" in resolution, the voltage steps generated in the decoding process will be a close enough approximation of the original analog voltage waveform to produce minimum distortion.

But how does the analog to digital converter "stop" a continuously changing waveform so it can measure the voltage? By using a [[sample and hold]] circuit.

← Older revision		Revision as of 22:38, 26 February 2012
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	Thus; a digital audio recording is a continuous series of ''samples'' of the constantly changing analog audio input. The samples must be played back in the same order and at the same "speed" they were recorded- the [[sample frequency]].		Thus; a digital audio recording is a continuous series of ''samples'' of the constantly changing analog audio input. The samples must be played back in the same order and at the same "speed" they were recorded- the [[sample frequency]].
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		+	[[Category:Terminology]]
		+	[[Category:Audio conversion]]

← Older revision		Revision as of 22:37, 26 February 2012
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	But how does the analog to digital converter "stop" a continuously changing waveform so it can measure the voltage? By using a [[sample and hold]] circuit. The sample and hold circuit is the digital audio equivalent of a movie camera's shutter, and like the constant speed of the movie camera's shutter being 24 fps; the AD converter's sample and hold circuit must take a "snapshot" of the audio waveform voltage once every [[sample period]].		But how does the analog to digital converter "stop" a continuously changing waveform so it can measure the voltage? By using a [[sample and hold]] circuit. The sample and hold circuit is the digital audio equivalent of a movie camera's shutter, and like the constant speed of the movie camera's shutter being 24 fps; the AD converter's sample and hold circuit must take a "snapshot" of the audio waveform voltage once every [[sample period]].
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		+	Thus; a digital audio recording is a continuous series of ''samples'' of the constantly changing analog audio input. The samples must be played back in the same order and at the same "speed" they were recorded- the [[sample frequency]].

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 ==Overview==
-The term "<nowiki>Sample</nowiki>" is used to describe a method where a constantly changing input is "observed" at one instant in time. It can also be used as a noun to describe the result of [[sampling]].
+The term "<nowiki>Sample</nowiki>" is used to describe a method where a constantly changing input is "observed" at one instant in time. It can also be used as a noun to describe the result of ''sampling''.
 ==Basics==