Android phone audio analysis and testing
Nowadays, a smart phone inherits a lot of functions. Many people choose to use a mobile phone to listen to songs. The music playback function of the mobile phone is enough to replace the position of the previous MP3 player. It's very convenient to use a mobile phone to listen to songs, but it often feels that the sound quality of the phone is not very good, especially the Android smartphone.
Backgammon vivo smart machine SRC test
In fact, the audio architecture of Android smart system has caused the poor quality of music playback on Android phones. The root of the problem is that the audio frequency of the Android system playing the sampling frequency higher than 44.1KHz will force the sampling frequency of the audio to be reduced to 44.1KHz. Directly led to the emergence of SRC problems, this is a flaw in the Android system.
What is SRC? SRC is the Sample Rate Converter, which means sampling frequency conversion. It is concerned by sound card enthusiasts, and most enthusiasts regard SRC as a sound quality killer.
Android phone has a common SRC problem
Recently, we received a smartphone to propose their solution to this problem, so that Android phones can lead the game with other Android smartphones in terms of sound quality. Is this true? Let's test it out.
How to test?
This smart phone can solve the SRC problem of Android system. It is the first among many mobile phone manufacturers. Let's test this mobile phone first, firstly use 20Hz to 20KHz full-frequency scanning for testing, then test subjective hearing. .
Tested using 44.1KHz audio and 48KHz audio
The full-frequency scan test uses two wav files of sampling frequency, 44.1KHz audio and 48KHz audio, and the files are placed in the mobile phone for playback. The cool edit pro recording is used to perform spectrum analysis on the recordings, and the SRC appears frequently when the shares appear. A messy line.
Normally no image of SRC
Image when SRC appears
The second picture is the image of SRC. Now many Android phones have SRC problems. The theoretical test results are similar to the second one, and the BBK vivo smartphone solves the SRC problem. The test result should be close to the first picture.
Test using E-MU 0404 professional sound card
Since we don't have professional test equipment on hand, we can only use the computer for testing. The test uses the E-MU 0404 PC professional sound card as the input sound card and uses the cool edit pro to record. Because the test environment is not very professional, there may be a small amount of noise. Introduced, and the image is not perfect, but it can also reflect the problem.
SRC test
This test is not only for a brand of smart phones, we also found the Nexus S and Meizu M9 for comparison, let's look at the results of the test.
44.1KHz sampling frequency audio scanning:
Nexus S test image
Meizu M9 test image
A brand Android test image
The above test chart shows that the image of the Android system is very clean at the sampling frequency of 44.1KHz, which means that the sound quality is not affected. This is because the sampling frequency specified by the Android audio architecture is 44.1KHz, for most MP3s. The audio is at the sampling frequency of 44.1KHz, and the problem is basically not big for the MP3 audio Android system.
48KHz sampling frequency audio scanning
48KHz sampling frequency audio scanning is the focus of this test, because the audio structure of Android system limits the sampling frequency of 44.1KHz, so the sampling frequency higher than 44.1KHz will be converted into 44.1KHz, which directly leads to poor sound quality. Look at the test results.
Nexus S test image
Meizu M9 test image
The test results are terrible. The Sex problem of the Nexus S using Android 4.0 system still exists. There are a lot of interlaced lines in the image, and the image of the Meizu M9 using the Android 2.3 system also shows that the SRC problem is very serious.
A brand of Android smartphone test images
A brand of Android smartphones with 48KHz sampling frequency audio scan results are much better than the above two mobile phones, only a very light line appears on the scanning line, like a very big leap for other Android systems, for playback High-quality audio This Android smartphone can better restore the original sound quality.
Subjective listening:
Test the MP3 using a 48KHz sampling frequency
After talking about the theoretical things to point to the actual sense of hearing, it is quite common to try to listen to music on mobile phones. The test uses two MP3 sampling frequencies of 48K to test, and listen to the difference between the sound quality of a certain brand of smart phones and other smart phones.
Test using UE TF10 headphones
First of all, listen to the MP3 of the 48KHz sampling frequency of the general Android mobile phone. The test uses the UE TF10 in-ear earphone, and the sound is warmer and a bit awkward. The details of the music cannot be displayed well in some places. The same was encountered on the Android phone, the sounds were warm and the details were not good. Listening back to the front 20Hz-20KHz with headphones is obviously a problem. In addition to the sound of the scanning signal, you can hear some audio scanning sounds that follow the scanning signal. This is the staggered line on the image, which has a serious impact. Hearing.
Let's talk about the sense of hearing on a brand of smart phones. When listening to the MP3 of 48KHz sampling frequency, the overall sound is very clear and natural, the details are very clear, there is not too much sound, the sound field is also wide, and the overall performance is very it is good. Listening to the audio scan signal, there is no previous situation, only the audio scan signal is heard, very clean, without any interference.
Test summary
What technology is used to solve the SRC problem?
Through this test, you can see that a certain brand of Android smartphone has solved the SRC problem of Android mobile phone well and improved the sound quality of Android mobile phone audio playback. Although it is not convenient to announce the brand due to confidentiality reasons, it is not known what technology is used. To solve the SRC problem in Android, but it is certain that this brand of Android smartphone is the first mobile phone to solve the Android system SRC problem. This technology to reject the SRC issue will also be announced, and we will announce the brand and model of this mobile phone for everyone.
Wall-Mounted Voltage Stabilizer
Wall Hanging Voltage Stabilizer Regulator,Wall-Mounted Voltage Stabilizer,Automatic Ac Voltage Stabilizer
Heyuan Electronic Technology Co., Ltd. , http://www.yqvoltagestabilizer.com