Sound quality evaluation method for home theater audio system
[Home Theater Network HDAV.com.cn] is able to enjoy high-quality spiritual enjoyment in listening to music through the home theater audio system, which is the goal of enthusiasts. Talking about the topic of sound quality, I feel a little confused and complicated. There are too many professional terms and personal subjective feelings, including some audio professional magazines, and many home theater audio critics use the sound effects. There are so many "fever terms", such as the descriptions of the fairy tales, which have been fascinating for many years and are puzzling, which makes it difficult to understand clearly and thoroughly. How to evaluate the sound quality of home theater audio system in a simple and easy-to-understand way? Here are some recommended and practical methods for everyone.
Sound quality evaluation is nothing more than objective technical parameter measurement plus subjective listening experience. The measurement of the technical parameters is not discussed in this article, but mainly refers to the simple and practical subjective listening experience.
Usually there are three elements in the evaluation of sound:
First, the loudness
Refers to the strength of the sound, the unit of use is decibel (dB). The minimum sound pressure that the human ear can detect is 0 decibels, and the maximum sound pressure that can be withstood is about 120 decibels. It is also a hearing pain valve. When it is exceeded, it will instantly damage to hearing!
List the distribution of sound pressure in real life:
10-20 dB: watch walking sound
80-100 decibels: truck sound on the street
20-40 decibels: whispering
100-120 decibels: the strongest sound of the symphony
40-60 dB: window air conditioner
120-140 dB: Jet plane takes off
60-80 decibels: noisy office
Second, the tone
Refers to the high and low frequency of the sound, the human ear can smell the frequency called audio, about 20Hz-20kHz, the unit of use is Hertz (Hz). Because the division of various international standards is not uniform, the seven sections of the common division are taken as an example:
20-40Hz subwoofer
40-160Hz bass
160-315Hz bass
315-2500Hz midrange
2500-5000Hz middle and high pitch
5000-10000Hz high pitch
10000-20000Hz super high pitch
Third, the tone
It is a sound feature, usually the ratio of the strength of the pitch and the overtone is different. The understanding of this sound element can be thought of as the sound of instruments such as piano, violin, guitar, etc. Even if the loudness and tone are the same, we can distinguish it. The third sound element is the tone. It is easier to understand that the timbre depends on different overtones. The sounds of each instrument, different people and all vocal objects, in addition to a pitch, are accompanied by many overtones of different frequencies. Determined the different sounds. It is important to note that the tone is not equal to the sound quality!
The meaning of sound quality is based on the comprehensive manifestation of the above three elements of sound, and the evaluation of listening sound also surrounds the three elements of sound.
The first step is the basic speaker placement. It is recommended to use the standard method of recording production to be more rigorous.
This is an equilateral triangle method, and most of the high-fidelity two-channel stereo music production uses this placement method.
The second step is to play the music at the correct volume. Turn the amplifier volume to 80-90dB decibels (sound pressure), which is slightly higher than the normal dialogue level, but it will not feel too difficult to avoid the deterioration of sound quality caused by too small or too much sound pressure.
According to the sound quality evaluation data, the sound pressure level of 80 to 90 dB when playing music is the most beautiful and pleasant for human hearing, which is also the sound pressure standard for sound quality evaluation at home and abroad.
The third step is the choice of the track:
1. Male and female voices:
It is the most familiar and sensitive part of the human ear. The sound structure of this part is reasonable or not, which is related to the sound is not good. It can also show the distortion of the sound system, that is, the roundness, fullness and transparency of the sound.
Enthusiasts strongly recommend the audition of "Tsai Chin" Chinese female voice songs, the widely recognized situation is very reasonable.
2. Percussion instruments:
It is used to evaluate the transient response, volume and frequency dive of the speaker's bass effect at the lowest level of sound quality in the sound system. In the audio system, low frequency is an important basis for Hi-Fi, and losing high-quality bass will greatly reduce the enjoyment of music. The famous audition disc "EAGLES Eagles" can be said to be a comprehensive and comprehensive demonstration disc. One of the "HOTEL CALIFORNIA California Hotel" opening drum performances has been proven for more than ten years and can be proved.
3. Classical symphony:
Due to the large number of instruments, it can express the high, medium and low frequency layering of the sound system, that is, the frequency characteristics.
In general, it is to listen to the instruments of each voice. Because most of the classical music is produced in a concert hall with good acoustic environment, it can also express the sense of the live space of the sound system, which is of course related to the listening environment in your house.
4, electronic synthesis music:
Express the sound pressure dynamic range and sound field size of the sound system. Some famous electronic music is non-sound
Learning musical instruments can almost reach the limits of audio equipment. On the cover of the disc, the words "Attention to control the volume! Carefully burn the speakers" are usually indicated. Because there is no point source effect when the instrument is played, the sound stage (ie, the sound field) can be made very wide by inverting and other methods.
5, jazz:
Performance sound system positioning and stereo speaker consistency. It is the most common fever dish in Europe and America. The jazz songs are less musical instruments and have SOLO solo for each musician. They can get clear sound image positioning and are the most easy to show the charm of stereo music.
6, solo instruments:
Express the resolution, transparency and tone structure of the sound system. Most musicians will use some of the more difficult techniques to play complex songs. The saying goes: One minute on the stage, ten years of work, even if it is a layman, you have to see it clearly. It must be true to be able to hear it.
Finally, let's talk about the tricks of choosing small speakers and large speakers to choose different tracks. Small speakers usually refer to bookshelf type, which has the characteristics of point source arrangement similar to the pronunciation of natural instruments. The sound will be more natural and accurate. Due to the small size of the speaker unit, the diaphragm quality is light, the transient reflection speed is fast, but the low frequency part is weaker. The recommended tracks for the tasting are recommended: male and female vocals, jazz, classical chamber music, solo instruments, which are known for their melodic music.
The large-sized speaker usually refers to the floor type, and has the characteristics of a line source arrangement composed of a plurality of speaker units, and the sound layering is good, the dynamic is large, the bass is dive and the volume is rich. Playing large symphonies is magnificent and hierarchical; the reproduction of electronically synthesized music, percussion instruments, and modern pop music has a good performance. More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.
Note: This article is transferred from Solan. The article is an independent view of the author and does not represent the position of the home theater network.
M Series Circular Waterproof Connectors
M Series Circular Waterproof Connectors,Straight Head Waterproof Connector,Industrial Automation Waterproof Connector,Waterproof Connector For Control Distribution
Shenzhen HuaTao Electronic Co., LTD , https://www.htconnector.com