Blind test - Revision history

94.25.160.60 at 20:51, 23 December 2021

2021-12-23T20:51:00Z

← Older revision		Revision as of 20:51, 23 December 2021
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	Blind listening tests are required in order to eliminate any ''bias'' that would lead the listener to prefer one source over another for personal reasons or preferences, that would have nothing to do with the sound. People also often imagine hearing differences between, say, a [[Compact Disc Digital Audio\|Audio CD]] and an [[MP3]] coming from this CD, just because knowing that they are listening to an MP3 disturbs them. When the test is blind, the listener doesn't know if he is listening to a CD or an MP3, so he can't tell that the MP3 sounds bad just because he doesn't like MP3. It can only tell it if it does sound bad.		Blind listening tests are required in order to eliminate any ''bias'' that would lead the listener to prefer one source over another for personal reasons or preferences, that would have nothing to do with the sound. People also often imagine hearing differences between, say, a [[Compact Disc Digital Audio\|Audio CD]] and an [[MP3]] coming from this CD, just because knowing that they are listening to an MP3 disturbs them. When the test is blind, the listener doesn't know if he is listening to a CD or an MP3, so he can't tell that the MP3 sounds bad just because he doesn't like MP3. It can only tell it if it does sound bad.

	:<span style="color:blue;">In [[Hydrogenaudio]], we use blind test mostly in order to judge the sound quality of codecs, but they can also be used to listen to any piece of audio device. The ~~prefered~~ tests for audio codecs are [[ABX]] tests.</span>		:<span style="color:blue;">In [[Hydrogenaudio]], we use blind test mostly in order to judge the sound quality of codecs, but they can also be used to listen to any piece of audio device. The preferred tests for audio codecs are [[ABX]] tests.</span>

	Double blind tests are ~~prefered~~ in medicine. There are evidences that when the physician knows what he is giving, the effect on the patient is affected. The situation in audio tests is a bit different, but a double blind test is always more rigorous than a simple blind test, because any influence from the operator on the listener is ruled out.		Double blind tests are preferred in medicine. There are evidences that when the physician knows what he is giving, the effect on the patient is affected. The situation in audio tests is a bit different, but a double blind test is always more rigorous than a simple blind test, because any influence from the operator on the listener is ruled out.

	== Setting up a Blind Test ==		== Setting up a Blind Test ==
	Setting up double blind listening tests is very difficult in ~~hifi~~. Either it requires very much money, for example to compare two amplifiers, 8 hidden units of each model would be connected to a switch, and no one in the room would know which of the 16 possible sources is what. Either it is very complicated and time consuming: in order to switch between the two amplifiers, the listeners would have to leave the room, and the operator would come in, close the door, choose to switch or not the devices, leave, and tell the listeners to come in again.		Setting up double blind listening tests is very difficult in Hi-Fi. Either it requires very much money, for example to compare two amplifiers, 8 hidden units of each model would be connected to a switch, and no one in the room would know which of the 16 possible sources is what. Either it is very complicated and time consuming: in order to switch between the two amplifiers, the listeners would have to leave the room, and the operator would come in, close the door, choose to switch or not the devices, leave, and tell the listeners to come in again.

	Fortunately, if we compare codecs on a computer, double blind tests are very easy to perform. When a program like [http://ff123.net/abchr/abchr.html ABC/HR] plays a random file for us to identify, since we have no way to know if it is the original file or the encoded file, we can say that the test is double blind.		Fortunately, if we compare codecs on a computer, double blind tests are very easy to perform. When a program like [https://web.archive.org/web/20120204073510/http://ff123.net/abchr/abchr.html ABC/HR] plays a random file for us to identify, since we have no way to know if it is the original file or the encoded file, we can say that the test is double blind.


	[[Category:Listening Tests]]		[[Category:Listening Tests]]

Speckmade at 14:18, 14 June 2007

2007-06-14T14:18:21Z

Pepoluan: Sectionize, add intro, fix link, etc.etc.etc.

2006-09-15T20:54:49Z

Sectionize, add intro, fix link, etc.etc.etc.

← Older revision		Revision as of 20:54, 15 September 2006
Line 1:		Line 1:
			In summary, a '''blind test''' is needed to prevent what is known as the [[placebo effect]] when trying to discern the difference between two items.

			==Background==

	The concept of blind test was first introduced in medicine, in order to determine the effect of drugs on test subjects without coloring the results with subjective responses from both the subjects and experimenters.		The concept of blind test was first introduced in medicine, in order to determine the effect of drugs on test subjects without coloring the results with subjective responses from both the subjects and experimenters.

	A blind medical test is a test where the patient doesn't know if he is taking a real product or placebo pills.		* A ''blind'' medical test is a test where the patient doesn't know if he is taking a real product or placebo (i.e. fake) pills.

	A double blind medical test is a test in which the patient doesn't know if he is taking a real product or placebo pills, nor does the physician who gives them to him.		* A ''double blind'' medical test is a test in which the patient doesn't know if he is taking a real product or placebo pills, nor does the physician who gives them to him.

	Such tests are required in order to prove that when someone takes a new product, the product itself has an action on the disease, and that if a healing occurs, it is not completely caused by the natural defenses of the human body or by the [[placebo]] ~~effect~~.		Such tests are required in order to prove that when someone takes a new product, the product itself has an action on the disease, and that if a healing occurs, it is not completely caused by the natural defenses of the human body or by the [[placebo effect]].

			==Audio Definition==

	In order to adapt this definition in audio, we can say that:		In order to adapt this definition in audio, we can say that:

	A blind listening test is a listening test in which the tester doesn't know what source he is listening to.		* A ''blind'' listening test is a listening test in which the tester doesn't know what source he is listening to.

	A double blind listening test is a test in which nobody in the room know which source is being played.		* A ''double blind'' listening test is a test in which nobody in the room know which source is being played.

	~~Blinds~~ listening tests are required in order to eliminate any [[bias]] that would lead the listener to prefer one source over another for personal reasons or preferences, that would have nothing to do with the sound. People also often imagine hearing differences between, say, a [[CD]] and an [[MP3]] coming from this CD, just because knowing that they are listening to an MP3 disturbs them. When the test is blind, the listener doesn't know if he is listening to a CD or an MP3, so he can't tell that the MP3 sounds bad just because he doesn't like MP3. It can only tell it if it does sound bad. In [[Hydrogenaudio]], we use blind test mostly in order to judge the sound quality of codecs, but they can also be used to listen to any piece of audio device. The prefered tests for audio codecs are [[ABX\|ABX tests]].		Blind listening tests are required in order to eliminate any ''bias'' that would lead the listener to prefer one source over another for personal reasons or preferences, that would have nothing to do with the sound. People also often imagine hearing differences between, say, a [[CD]] and an [[MP3]] coming from this CD, just because knowing that they are listening to an MP3 disturbs them. When the test is blind, the listener doesn't know if he is listening to a CD or an MP3, so he can't tell that the MP3 sounds bad just because he doesn't like MP3. It can only tell it if it does sound bad.

			:<font style="color:blue;">In [[Hydrogenaudio]], we use blind test mostly in order to judge the sound quality of codecs, but they can also be used to listen to any piece of audio device. The prefered tests for audio codecs are [[ABX\|ABX tests]].</font>

	Double blind tests are prefered in medicine. There are evidences that when the physician knows what he is giving, the effect on the patient is affected. The situation in audio tests is a bit different, but a double blind test is always more rigorous than a simple blind test, because any influence from the operator on the listener is ruled out.		Double blind tests are prefered in medicine. There are evidences that when the physician knows what he is giving, the effect on the patient is affected. The situation in audio tests is a bit different, but a double blind test is always more rigorous than a simple blind test, because any influence from the operator on the listener is ruled out.

			==Setting up a Blind Test==

	Setting up double blind listening tests is very difficult in hifi. Either it requires very much money, for example to compare two amplifiers, 8 hidden units of each model would be connected to a switch, and no one in the room would know which of the 16 possible sources is what. Either it is very complicated and time consuming: in order to switch between the two amplifiers, the listeners would have to leave the room, and the operator would come in, close the door, choose to switch or not the devices, leave, and tell the listeners to come in again.		Setting up double blind listening tests is very difficult in hifi. Either it requires very much money, for example to compare two amplifiers, 8 hidden units of each model would be connected to a switch, and no one in the room would know which of the 16 possible sources is what. Either it is very complicated and time consuming: in order to switch between the two amplifiers, the listeners would have to leave the room, and the operator would come in, close the door, choose to switch or not the devices, leave, and tell the listeners to come in again.

HotshotGG at 21:33, 2 September 2006

2006-09-02T21:33:04Z

← Older revision		Revision as of 21:33, 2 September 2006
Line 22:		Line 22:


	[[Category:~~Technical~~]]		[[Category:Listening Tests]]

Pepoluan at 08:00, 2 September 2006

2006-09-02T08:00:38Z

← Older revision		Revision as of 08:00, 2 September 2006
Line 20:		Line 20:

	Fortunately, if we compare codecs on a computer, double blind tests are very easy to perform. When a program like [http://ff123.net/abchr/abchr.html ABC/HR] plays a random file for us to identify, since we have no way to know if it is the original file or the encoded file, we can say that the test is double blind.		Fortunately, if we compare codecs on a computer, double blind tests are very easy to perform. When a program like [http://ff123.net/abchr/abchr.html ABC/HR] plays a random file for us to identify, since we have no way to know if it is the original file or the encoded file, we can say that the test is double blind.


			[[Category:Technical]]

Foot: opening paragraph clarification

2005-08-21T01:17:49Z

opening paragraph clarification

← Older revision		Revision as of 01:17, 21 August 2005
Line 1:		Line 1:
	The concept of blind test was first introduced in medicine, ~~about taking~~ drugs.		The concept of blind test was first introduced in medicine, in order to determine the effect of drugs on test subjects without coloring the results with subjective responses from both the subjects and experimenters.

	A blind medical test is a test where the patient doesn't know if he is taking a real product or placebo pills.		A blind medical test is a test where the patient doesn't know if he is taking a real product or placebo pills.

Rjamorim: delinkage

2005-07-17T18:22:00Z

delinkage

← Older revision		Revision as of 18:22, 17 July 2005
Line 13:		Line 13:
	A double blind listening test is a test in which nobody in the room know which source is being played.		A double blind listening test is a test in which nobody in the room know which source is being played.

	Blinds listening tests are required in order to eliminate any [[bias]] that would lead the listener to prefer one source over another for personal reasons or preferences, that would have nothing to do with the sound. People also often imagine hearing differences between, say, a [[CD]] and an [[MP3]] coming from this [[CD]], just because knowing that they are listening to an [[MP3]] disturbs them. When the test is blind, the listener doesn't know if he is listening to a CD or an [[MP3]], so he can't tell that the [[MP3]] sounds bad just because he doesn't like [[MP3]]. It can only tell it if it does sound bad. In [[Hydrogenaudio]], we use blind test mostly in order to judge the sound quality of codecs, but they can also be used to listen to any piece of audio device. The prefered tests for audio codecs are [[ABX\|ABX tests]].		Blinds listening tests are required in order to eliminate any [[bias]] that would lead the listener to prefer one source over another for personal reasons or preferences, that would have nothing to do with the sound. People also often imagine hearing differences between, say, a [[CD]] and an [[MP3]] coming from this CD, just because knowing that they are listening to an MP3 disturbs them. When the test is blind, the listener doesn't know if he is listening to a CD or an MP3, so he can't tell that the MP3 sounds bad just because he doesn't like MP3. It can only tell it if it does sound bad. In [[Hydrogenaudio]], we use blind test mostly in order to judge the sound quality of codecs, but they can also be used to listen to any piece of audio device. The prefered tests for audio codecs are [[ABX\|ABX tests]].

	Double blind tests are prefered in medicine. There are evidences that when the physician knows what he is giving, the effect on the patient is affected. The situation in audio tests is a bit different, but a double blind test is always more rigorous than a simple blind test, because any influence from the operator on the listener is ruled out.		Double blind tests are prefered in medicine. There are evidences that when the physician knows what he is giving, the effect on the patient is affected. The situation in audio tests is a bit different, but a double blind test is always more rigorous than a simple blind test, because any influence from the operator on the listener is ruled out.

Jan at 11:43, 22 March 2005

2005-03-22T11:43:07Z

New page

The concept of blind test was first introduced in medicine, about taking drugs.

A blind medical test is a test where the patient doesn't know if he is taking a real product or placebo pills.

A double blind medical test is a test in which the patient doesn't know if he is taking a real product or placebo pills, nor does the physician who gives them to him.

Such tests are required in order to prove that when someone takes a new product, the product itself has an action on the disease, and that if a healing occurs, it is not completely caused by the natural defenses of the human body or by the [[placebo]] effect.

In order to adapt this definition in audio, we can say that:

A blind listening test is a listening test in which the tester doesn't know what source he is listening to.

A double blind listening test is a test in which nobody in the room know which source is being played.

Blinds listening tests are required in order to eliminate any [[bias]] that would lead the listener to prefer one source over another for personal reasons or preferences, that would have nothing to do with the sound. People also often imagine hearing differences between, say, a [[CD]] and an [[MP3]] coming from this [[CD]], just because knowing that they are listening to an [[MP3]] disturbs them. When the test is blind, the listener doesn't know if he is listening to a CD or an [[MP3]], so he can't tell that the [[MP3]] sounds bad just because he doesn't like [[MP3]]. It can only tell it if it does sound bad. In [[Hydrogenaudio]], we use blind test mostly in order to judge the sound quality of codecs, but they can also be used to listen to any piece of audio device. The prefered tests for audio codecs are [[ABX|ABX tests]].

Double blind tests are prefered in medicine. There are evidences that when the physician knows what he is giving, the effect on the patient is affected. The situation in audio tests is a bit different, but a double blind test is always more rigorous than a simple blind test, because any influence from the operator on the listener is ruled out.

Setting up double blind listening tests is very difficult in hifi. Either it requires very much money, for example to compare two amplifiers, 8 hidden units of each model would be connected to a switch, and no one in the room would know which of the 16 possible sources is what. Either it is very complicated and time consuming: in order to switch between the two amplifiers, the listeners would have to leave the room, and the operator would come in, close the door, choose to switch or not the devices, leave, and tell the listeners to come in again.

Fortunately, if we compare codecs on a computer, double blind tests are very easy to perform. When a program like [http://ff123.net/abchr/abchr.html ABC/HR] plays a random file for us to identify, since we have no way to know if it is the original file or the encoded file, we can say that the test is double blind.

← Older revision		Revision as of 14:18, 14 June 2007
Line 1:		Line 1:
	In summary, a '''blind test''' is needed to prevent what is known as the [[placebo effect]] when trying to discern the difference between two items.		In summary, a '''blind test''' is needed to prevent what is known as the [[placebo effect]] when trying to discern the difference between two items.

	==Background==		== Background ==

	The concept of blind test was first introduced in medicine, in order to determine the effect of drugs on test subjects without coloring the results with subjective responses from both the subjects and experimenters.		The concept of blind test was first introduced in medicine, in order to determine the effect of drugs on test subjects without coloring the results with subjective responses from both the subjects and experimenters.

	* A ''blind'' medical test is a test where the patient doesn't know if he is taking a real product or placebo (i.e. fake) pills.		* A ''blind'' medical test is a test where the patient doesn't know if he is taking a real product or placebo (i.e. fake) pills.

	* A ''double blind'' medical test is a test in which the patient doesn't know if he is taking a real product or placebo pills, nor does the physician who gives them to him.		* A ''double blind'' medical test is a test in which the patient doesn't know if he is taking a real product or placebo pills, nor does the physician who gives them to him.

	Such tests are required in order to prove that when someone takes a new product, the product itself has an action on the disease, and that if a healing occurs, it is not completely caused by the natural defenses of the human body or by the [[placebo effect]].		Such tests are required in order to prove that when someone takes a new product, the product itself has an action on the disease, and that if a healing occurs, it is not completely caused by the natural defenses of the human body or by the [[placebo effect]].

	==Audio Definition==		== Audio Definition ==

	In order to adapt this definition in audio, we can say that:		In order to adapt this definition in audio, we can say that:

	* A ''blind'' listening test is a listening test in which the tester doesn't know what source he is listening to.		* A ''blind'' listening test is a listening test in which the tester doesn't know what source he is listening to.

	* A ''double blind'' listening test is a test in which nobody in the room know which source is being played.		* A ''double blind'' listening test is a test in which nobody in the room know which source is being played.

	Blind listening tests are required in order to eliminate any ''bias'' that would lead the listener to prefer one source over another for personal reasons or preferences, that would have nothing to do with the sound. People also often imagine hearing differences between, say, a [[CD]] and an [[MP3]] coming from this CD, just because knowing that they are listening to an MP3 disturbs them. When the test is blind, the listener doesn't know if he is listening to a CD or an MP3, so he can't tell that the MP3 sounds bad just because he doesn't like MP3. It can only tell it if it does sound bad.		Blind listening tests are required in order to eliminate any ''bias'' that would lead the listener to prefer one source over another for personal reasons or preferences, that would have nothing to do with the sound. People also often imagine hearing differences between, say, a [[Compact Disc Digital Audio\|Audio CD]] and an [[MP3]] coming from this CD, just because knowing that they are listening to an MP3 disturbs them. When the test is blind, the listener doesn't know if he is listening to a CD or an MP3, so he can't tell that the MP3 sounds bad just because he doesn't like MP3. It can only tell it if it does sound bad.

	:<~~font~~ style="color:blue;">In [[Hydrogenaudio]], we use blind test mostly in order to judge the sound quality of codecs, but they can also be used to listen to any piece of audio device. The prefered tests for audio codecs are [[ABX~~\|ABX tests~~]].</~~font~~>		:<span style="color:blue;">In [[Hydrogenaudio]], we use blind test mostly in order to judge the sound quality of codecs, but they can also be used to listen to any piece of audio device. The prefered tests for audio codecs are [[ABX]] tests.</span>

	Double blind tests are prefered in medicine. There are evidences that when the physician knows what he is giving, the effect on the patient is affected. The situation in audio tests is a bit different, but a double blind test is always more rigorous than a simple blind test, because any influence from the operator on the listener is ruled out.		Double blind tests are prefered in medicine. There are evidences that when the physician knows what he is giving, the effect on the patient is affected. The situation in audio tests is a bit different, but a double blind test is always more rigorous than a simple blind test, because any influence from the operator on the listener is ruled out.

	==Setting up a Blind Test==		== Setting up a Blind Test ==

	Setting up double blind listening tests is very difficult in hifi. Either it requires very much money, for example to compare two amplifiers, 8 hidden units of each model would be connected to a switch, and no one in the room would know which of the 16 possible sources is what. Either it is very complicated and time consuming: in order to switch between the two amplifiers, the listeners would have to leave the room, and the operator would come in, close the door, choose to switch or not the devices, leave, and tell the listeners to come in again.		Setting up double blind listening tests is very difficult in hifi. Either it requires very much money, for example to compare two amplifiers, 8 hidden units of each model would be connected to a switch, and no one in the room would know which of the 16 possible sources is what. Either it is very complicated and time consuming: in order to switch between the two amplifiers, the listeners would have to leave the room, and the operator would come in, close the door, choose to switch or not the devices, leave, and tell the listeners to come in again.