What factors affect the results and effectiveness of blind listening experiments?

Blind listening test. Blind listening is a special test method in the audio industry. It refers to the listener's sense of hearing to judge the quality of the sound, regardless of the impact of the speaker's brand and appearance on the listener.

People usually listen**, from a variety of factors that affect our actual hearing. These factors include cables, speakers, and even the software decoder itself. A professional blind listening test contains many strict rules and criteria.

For example: the length and width of the listening room, the reverberation time, the sound level of the playback system, ambient noise, etc.

It is impossible to verify something that does not exist. If you have doubts about something, such as a sound codec that you think will affect the sound quality, you should test it and not assume based on any assumptions.

Tests should be performed under double-blind conditions. A single-blind test means you can't tell if X is A or B unless you're actually listening. A double-blind test is one in which neither the operator nor the tester knows whether X is A or B during the test to avoid cues that the operator may have intentionally or unintentionally.

That is, a third party is responsible for the conversion. There is quite a bit of software available on your computer that can be used for ABX testing.

<> ensure that testers are not aware of the results until the test is completed, including any pilot tests that may be conducted prior to the official test. Otherwise, the tester should know the results after each test and be able to stop the test at any time.

Test for the first time. If not, the results of all previous tests should be taken into account at the same time. The subject can reserve his opinion, i.e., during the test, when he is unwilling to make his own judgment, he can periodically reserve his opinion and ask for a pause to resume it later.

The test procedure must be repeatable and based on the same test procedure, the test results should be consistent. Timing during testing is another issue to consider. For example, during continuous testing, the same time intervals should be given to avoid guesswork by the tester's judgment influenced by different time series.

It will be affected by the surrounding environment, will be affected by the length and time of the **, the test method is related to the ascent method and the descent method The results detected are completely different, and the intensity of the sound is related, and the personal psychological problems and physical conditions are related.

It will be affected by the air noise and some noisy sounds seen from the outside world, of course, there will be a certain sound, and there will be a certain amount of current sound, when testing blind listening, you must pay attention to the environment.

It will be affected by the atmosphere of the scene, it will be affected by teaching factors, it will be affected by the outside of students' learning, it will also be affected by noise, and it will also be affected by outdoor factors.

It will be affected by objectivity, subjective will, the opinions of others, as well as the external environment, and uncontrollable factors in the experiment.