HI-FI was proposed and established. It was originally combined with audio and video. That is, the HI-FI system should present clear audio when playing back the sound source as the basic condition above the previous advanced radio or portable recording player. Therefore, as a HI-FI or higher level HI-END system, there are very demanding requirements for audio and video. These requirements can be summarized in the following four aspects: sound field, resolution, weak signal reproduction ability and texture. We will introduce these questions to our friends one by one. Today we will discuss the sound field first.
The sound field used in our evaluation as an audio quality evaluation index is a relatively broad method, which refers to the three-dimensional spatial distribution of phonemes. This includes the size of the audio stage space. The position in the listening room, the position of the phoneme group in the audio stage, and the transparency and atmosphere of the space around the audio stage.
The size and position of the audio stage can be reflected by the boundary position of the phoneme distribution. In addition to the width, depth and height of the sound field, the distance from the midpoint of the sound field to the listening table is also an important positional element, which can measure the front or back of the sound field. The ideal requirement of the HI_END level equipment for the sound field is that the sound field should be slightly equal to the true expression field of the sound source. The distance from the front of the sound field to the listener should be equal to about half of the field width. The solo actor or the solo performer should listen to the listener. It is important that the preface of Singapore has a deviation or dynamic swing that is not too far from the central line. The last important requirement is that the distribution of phonemes in the sound field space should have uniformity, that is to say, the distribution of phonemes in the sound field depends only on the guidance of the source information, and is not affected by the spatial position of the sound field. A phenomenon like a thin piece, like a TV screen, should not have a certain part of the TV picture is particularly thick or particularly light, particularly deep or very shallow, or a part of the pixel is particularly crowded or special vegetables.
The sound field mentioned above is an ideal sound field, which is not easy to realize in the general family. This is because it is not only related to the equipment itself (the relationship between the speakers is the most important, and the second is the power amplifier part). It also depends on the sound field information contained in the sound source software, and depends on the size and structure of the listening room, as well as the position of the speaker in the listening room, the relative position and height of the listening seat and the speaker, etc. It is a problem that equipment investment can solve. Many living rooms or living rooms are small and irregular, and generally cannot be used as a listening room alone. Because of the various things, it is difficult to arrange the speakers, and even the pins can be stitched, often because The left and right asymmetry of the building structure (such as the left side of the wall is the window or the left side of the bed is the door to the right), which have a very bad influence on the formation of the correct sound field. Therefore, the primary problem is to ensure that the sound field is centered in front of the listener, and often adjust the left and right channel volume balance knobs to a reasonable degree until it feels reasonable.
As for the way the speakers are placed indoors, some fans have proposed the 317 rules, and others have proposed other rules. These methods will be introduced to friends during other programming hours. Some high-end speakers indicate the placement method in the manual. These rules have certain reference value, but in practical applications, it is not necessarily the best for your listening environment and speakers, and it does not necessarily work. For example, if the speaker is required to be placed in the same length of 1/3 of the room, it can only be realized in the professional listening room. Generally, the room that is used for other purposes will block the way. Therefore, everything depends on the local conditions. Repeated practice and hard work, put on a sound field that can at least be said to be or better.
As mentioned above, the relationship between sound field scale and audio equipment is still very close, although its importance is slightly inferior to the position and listening room structure. First of all, the relationship between the speaker and the sound field is self-evident. Generally speaking, high-quality speaker manufacturers have made full considerations when designing the speaker. This kind of speaker will be better if it is placed properly. As for the performance of the power amplifier, the influence on the sound field is not small. The greater the power of the power amplifier, the greater the ability to form the sound field.
Finally, let's talk about the transparency and atmosphere of the sound field space. This really belongs to a very delicate problem. It is often difficult for the first brother to be a middle-level enthusiast. In order to understand this problem, we You can take a live video from a world-famous concert hall and replay it on the system. If it allows people to listen to live concerts in the concert hall, not only can you hear the stereo sound of the symphony, but you can also feel it. This kind of performance is played in a very embossed, transparent environment. The sound of the music and the whisper of the front audience can be reproduced vividly in the music gap (of course, this also involves us. The small signal reproduction ability to be talked about), and once the symphony orchestra chords, the drums are loud, and the tens of thousands of troops enter the climax, the powerful music subject and the space structure of the concert hall form an extremely spectacular sound. The sound (that is, the hall sound we often say) gives people a very apt and immersive feeling, so that the HI-END equipment is around the stage of the audio-visual stage.
Of course, experienced fans know that the sound field can be completely empty, or else there will be no advertisements that are wide and deep in the sound field, but the scope of the sound field is inclusive. It is very difficult for the band to accommodate the entire atmosphere of a concert hall. Therefore, we should treat a set of HI-END sound systems in a realistic and objective manner.
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