[Home Theater Network] According to the author's understanding, many people use the sound system of the computer to listen to music. For the classic fever music, I want to appreciate it very well. It is impossible to rely on computer audio alone. I personally I like the fever audio and music, and I have compiled some basic knowledge of fever audio and music appreciation, as well as various levels of fever CDs for everyone to learn and communicate.

(1) Classification of lossless music formats:

In the field of audio compression, there are two compression methods, lossy compression and lossless compression. The MP3, WMA, and OGG that we often find are called lossy compression. As the name suggests, lossy compression reduces the audio sampling frequency and bit rate, and the output audio file will be smaller than the original file.

Another type of audio compression is called lossless compression. Lossless compression can compress the volume of the audio file less than 100% of all the data of the original file, and restore the compressed audio file to achieve the same size and the same code rate as the original file. Currently, lossless compression formats are common to APE, FLAC, and WAV. Here's a comparison of the two lossless compression formats:

FLAC is the abbreviation of Free Lossless Audio Codec. It is a very mature lossless compression format. Its reputation is not under APE! The source code of this format is completely open and compatible with almost all operating system platforms. Its encoding algorithm is quite mature, has passed rigorous testing, and can still play normally when the code is damaged. In addition, the format is the first lossless format to receive extensive hardware support. World-renowned digital products such as Rio's hard disk player Karma, Kenwood's car audio MusicKeg and PhatBox's digital player can support FLAC format.

APE is the format generated by Monkey's Audio program to compress WAV audio. The compressed APE file is about half smaller than the original WAV, but this compression method is not destructive compression. If this APE file is decompressed and restored, The resulting WAV file is exactly the same size as the original WAV file, so APE is also known as the lossless audio compression format.

The WAV format is a sound file format developed by Microsoft Corporation, also known as a waveform sound file. It is the earliest digital audio format and is widely supported by the Windows platform and its applications. The WAV format supports many compression algorithms, supports multiple audio bits, sampling frequency and channel. It uses 44.1kHz sampling frequency and 16-bit quantization digits. Therefore, the sound quality of WAV is almost the same as CD, but the WAV format requires too much storage space. It is inconvenient to communicate and spread.

(B) After we understand what is lossless music, let's talk about how to enjoy music!

Our listening music is mainly composed of three parts: treble, midrange, and bass. (In fact, it is the same as painting: bright, gray, and dark, and a piece of work requires three faces to have a three-dimensional effect.) Many people will say that everyone knows this, but how to distinguish and locate these scales? For a small sound, as long as the loudness is slightly increased, the human ear can feel it, but when the sound level increases to a certain value, even if There is a significant increase in the human ear but no significant change.

Usually, the audible sound is divided into three parts according to the multiplication frequency to determine the high, medium and low sounds, namely: the bass band 20HZ-160HZ. The middle audio segment is 160HZ-2000HZ. The high audio segment is 2000HZ-20000KHZ. Bass frequency band: People who play fever audio often say a word, bass is the soul of a music!

In the music released by good sound, the bass is compact, accurate, strong and clean. (Representative instruments: drum, cello, etc.) Middle audio segment: This band is the favorite frequency band of the human ear, sweet in music, Fine and natural, the voice of our people is within this frequency range, but the frequency band of women is slightly higher than that of men, so men prefer to listen to women, and women have more words (representative instruments: number, Guitar, etc.) High audio segment: If the bass is the soul of a music, then the treble is the essence of this music, the treble sounds clear, sweet, round and smooth (representative instruments: violin, flute, etc.).

For example: Tsai Chin's "The Ferry", you can carefully taste the high, medium and low bass inside. First of all, the bass drum is very light and full, the guitar sound is crisp and smooth, Tsai Chin's voice is magnetic, the midrange is very soft, and the guitar and wooden fish sounds are very rhythmic as an accompaniment. Interspersed with a violin sound, the playing technique is very delicate, full of texture, several instruments and Tsai Chin's voice intertwined, the pair of lovers will be separated from the helpless realm of the realm of the best.

(3) Elements of HI-FI

1. Sound quality. “Quality” is an innate nature. Sound quality refers to the quality of sound. Many people confuse it with “tone”. What is the quality of sound? The simplest analogy: When you say that a pair of shoes is of good quality, you must be fit, comfortable, and durable, not that it looks good and not fashionable. Similarly, sound quality refers to the intrinsic quality of sound, and we can understand the sound as an external image.

2. Voice. The tone is the color of the sound. The sound quality (TONE QUALITY) and the sound (TIMBRE or TONE COLOR) at a glance, it is not the same thing. We often hear: this violin sound is really cold, this violin sound is really warm, this is the sound of the violin. The sound is like light, it is colored, but it is not seen with the eyes, but with the ears. Usually, the warmer the sound, the softer the sound; the colder the sound, the harder the sound. Just like cloth, cloth refers to its material, but cloth color refers to its color, during which there is still a clear boundary.

3. The distribution and control of the sense of volume in each of the high, medium and low frequency bands. This project is easy to understand, but it is also easy to produce misunderstandings in text communication. How do you say it? Everyone will say: The treble of the pair is too strong and the bass is too small. This is the distribution of the high, medium and low frequency bands. The problem is that if the bandwidth from 20Hz to 20KHz is divided into three segments, it will inevitably lead to "inaccurate" confusion. Therefore, some people have long referred to the bandwidth of the instrument and the orchestra's name for the sound. The frequency of 20Hz-20KHz is divided into seven segments: extremely low frequency, low frequency, low frequency, medium frequency, medium frequency, high frequency, very high frequency. .

4. Sound field performance. What is the "sound field"? In the United States, "Sound Field" and "Sound Stage" are two nouns. "Sound Field" is the space where the entire sound is filled; "Sound Stage" refers specifically to the arrangement of the bands on the stage (including width, depth, height, and low). In China, what we call "sound field" actually means "Sound Stage"; as for "Sound Field", we have already replaced it with another noun, that is, "space sense." Therefore, when we refer to the "shape of the sound field", it refers to the arrangement of the orchestra that your equipment reproduces.

For the performance of the sound field, we can listen to the following points: First, the position of the sound field; Second, the width of the sound field; Third, the depth of the sound field.

5. The density and weight of the sound. The density of the sound is like a kilogram of cotton and a kilogram of iron. The density of the iron is of course much larger; therefore, although the weights of the two are the same, the weight of the iron gives a much greater weight. The sound density is large, what does it sound like? Strings have a sticky feeling, the tube is thick and full, and the percussion instrument will have the feeling of air vibration. Finally, the instrument and the human voice will sound more stable and solid. More like real.

6. A sense of transparency. Transparency is almost a term that can only be understood and cannot be said. Some records and equipment sound very clear, and some are like a mist, as long as people with a certain fever experience have this feeling. Transparency is an important part of the enthusiast, because if the sense of transparency is not good, it will affect the judgment of the rest. The best sense of transparency is soft, it sounds like the ears are not tired; the poor transparency is like the sun that hurts the eyes, although it is clear, it is very sad.

7. A sense of hierarchy. The layering is easy to understand. It refers to whether the instrument can be clearly regenerated from the interval to the next row. In the case of television, the words that dark gray and black can distinguish are layered. The sound is also the same, the arrangement of the orchestra will not be mixed together, there is a good sense of hierarchy, and even more, we have to hear the space between the instrument and the instrument, so that we have the best layering.

8. Positioning. As the name suggests, the sense of positioning is to "set there". If the aggregation is not accurate, the positioning will be poor. If the image is not good, the positioning will not work. The poor processing of each link during recording will also cause the drift of the positioning. Even in our listening space, the ratio of direct to reflected sound is not good. Will result in inaccurate positioning. In short, the poor sense of positioning may be caused by many reasons. We don't care how it is formed. What we ask is that the instrument or vocals should be embossed and clearly defined. If you don't want to move, don't move, don't You can't mess when you are in the chaos.

9. Live feelings. The so-called living feeling can be said to be the other side of the transient reaction, the sense of speed, and the contrast between strength and weakness. It makes you listen to music very lively and not dead. This is an important factor in whether music is good or not. It is like a superb conductor who can make the music conductor full of life; and the lame command often makes the music dead, which is the living feeling of music.

10. Image and body feeling. As the name suggests, the image is the ability to condense an ethereal sound into a solid; in other words, the ability of a human or musical instrument to exhibit a three-dimensional sense. Many enthusiasts tend to put this into the (physical sense), but we believe that the image and shape can be more specific. Sound imaging equipment will make the audio image more embossed, more stereoscopic, that is, the shadow of the audio and video contours we often say is clearer.

11. Resolution. The term is the easiest to understand. Anyone who has played the camera knows the difference between the resolution of the lens. People who watch TV also know that their TV can analyze a piece of black hair without any mismatch or good analytical performance. Good audio equipment, even subtle and complex things can be clearly expressed, this is the analytical power. But it must be emphasized that resolving power does not represent all the details of regeneration and layering.

12. Sense of speed and transient response. In fact, the sense of speed refers to the result of the transient reaction, but also the specific performance of the rise time and slew rate of the equipment. Foreigners usually say this as a reaction rather than a sense of speed. For the old, the sense of speed is easier to understand than the transient response. Basically, these two nouns refer to the speed of the various reactions of the equipment. I don't think I have to explain more here.

13. Strength and weakness contrast and dynamic contrast. The contrast between strength and weakness can also be said to be the dynamic contrast of foreigners, that is, the contrast between loud and small. In general, the strength and weakness comparison can also be divided into "contrast strong" strength and weakness contrast and "contrast very small" strength and weakness contrast. We often say that the dynamics of classical music means that the contrast between its maximum sound and the minimum sound is very large; what is the contrast of very small dynamic contrast? That is, the subtle contrast between the strong and the weak. The most obvious statement of strength and weakness should be like this: the great contrast between strength and weakness is the wave that beats the rocky shore; the contrast between the strong and the weak is the fluctuation of the lake under the breeze.

14. The ratio of the size of the instrument to the vocal. What kind of musical instrument and vocal size ratio is reasonable? Idealists think that it should be reduced to the size of the actual orchestra into the home listening room. In fact, this is impossible. Let's take the simplest example: When the piano and violin are playing sonatas, the shape of the piano does not know how many times more than the violin. If the volume of the violin is not increased during recording, the violin is often masked by the piano. The correct proportion of the instrument and the vocal size is not a blind reduction, but a proportional ratio according to reasonable musical requirements. The instrument is so, the voice is also the same. We often hear this phenomenon with some DJ music. We only hear a strong rhythm, but the voice is very small and it doesn't feel good.

15. The texture of the instrument and the human voice, the sense of the air. What we are talking about here is not the texture of the sound quality, but the texture that occurs when the instrument plays and strikes the touch. Therefore, when we are saying: "The violin's rubbing string is very good," it means "it recorded like a violin." As for the "air sensation", what is it? In fact, it means the feeling of blowing. To put it more clearly, the "air feeling" is the feeling of sound wave vibration. The so-called texture is also referred to as "fax degree", and most of them are the feeling of "contact" after the moment.

16. Detail regeneration. The details are probably the details of the instrument, the subtle regeneration of the dome and all the noise in the recording space. The amount of detail in a piece of audio equipment is easily compared with AB Test. Why do some of the equipment regenerate more details? We think this is related to low distortion, high signal-to-noise ratio, high sensitivity, resolution, and transparency. Equipment with less detail sounds boring on the flat; equipment with more details sounds interesting.

17. A sense of space. We often say that if a sound system (including equipment, records, and space) can "make the sound field out," then it must also "see" the sense of space. Please note that it is “seeing” rather than “hearing”. The true sound field and space sense can definitely be “seen” rather than just “hearing”. What is the sense of space? That is the size of the three-dimensional space of the recording place. In order to be able to fully express the sense of space, excellent detail regeneration is absolutely necessary, especially the regeneration of the "canyon".

18. Overall balance. Any record and audio equipment should be like a commanding orchestra, and should seek an overall balance. This is like an orchestra in which everyone is a solo master, but if everyone is out of the limelight and does not listen to the interpretation of the command, although the individual performance level is high, the overall balance of the orchestra must be very poor, so that is not the case. A good orchestra. With regard to this, we can't measure it by scale. To distinguish the overall balance is just like listening to a concert to distinguish the orchestra. It is only judged by its rich listening experience.

19. Equipment personality. Records and audio equipment are common to people, with their own personality, some sound like gentlemen, some like hot prodigals; some are gentle like ladies, some are like Carmen; because of different personality, therefore, it must be matched As with marriage, be cautious. Two pieces of hot temper are all together, so you can't get away with it. On the contrary, two pieces of warm water, slow Lang, together with you must also die. Therefore, the awareness of the personality of the equipment is absolutely necessary.

20. Equipment matching. As mentioned above, every record and every piece of equipment has its own personality. Improper equipment mix is ​​often more influential than the equipment itself. Not only ordinary enthusiasts, but even some experts often misunderstand the real ability of the equipment itself because of improper matching, which is very regrettable. Therefore, when configuring the equipment, it must be rationalized according to the musical performance characteristics of the equipment.

Some people say that I don't know how to match the sound? Through learning, we should be able to position ourselves and choose which sounds are suitable for ourselves. Some people often ask: What kind of audio do you use? In fact, everyone's appreciation level, hearing, hobbies, economic conditions, etc. are different. When choosing a sound, it must be based on personal preferences, and a purposeful choice is correct. Everyone should exchange more knowledge in this area and jointly improve the level of appreciation of everyone, WeChat: cnhifi.

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