What is it called Hi-Fi?

                                                                  What is Hi-Fi?

In the past years, high-fidelity speakers have been familiar to people. It is precisely because of the basic composition system of high-fidelity speakers-sound source equipment, power amplifiers, and speakers that replay music, it has brought many audiophiles and families. Joy and enjoyment enable people to understand the connotation of music; cultivate their own sentiments; A stream of clear water; music is a melting pot for cultivating one's temperament."

With the continuous development of TV technology, audio technology, digital technology, and the continuous improvement of people's living standards, the home theater boom has been rising in recent years. People are no longer satisfied with the simple appreciation of music in the past. It is to bring the playback effect of sound and image integration in the cinema back home, to enjoy the wonderful high-quality pictures; to listen to the playback effect of "quiet as a ghost, moving like thunder". Audio equipment has also changed from the past three-piece set (sound source, power amplifier, speaker) to a complex high-definition large-screen TV, projector, VCD, CVD, SCVD, DVD, Dolby surround system, SRS system, AC -3 system and DTS system and so on.

Due to the continuous emergence of new technologies and new types of equipment for various new home theaters, there are a wide variety of audio equipment in the market. The equipment is dazzled, and there is no way to start, and a large amount of money is often invested but a good playback effect cannot be obtained. The main reason is that the purchasers of the general home theater system do not have a clear understanding of the characteristics and differences between the high-fidelity audio system and the home courtyard audio system, and it is easier to confuse the two.

What is hi-fi audio equipment? Friends who love audio can often see the English label "Hi-Fi" in audio magazines or audio equipment. It is the abbreviation of "High-Fidelity" in English. The sound system means "high-fidelity", that is to say, the sound reproduced by the audio equipment is highly similar to the sound from the sound source recorded at the recording site. This type of equipment is called high-fidelity audio equipment. or hi-fi system. In some articles that comment on the playback sound effect of the hi-fi system, it is often seen that the playback sound of the equipment is described as "authentic", which is actually a description of the fidelity of the playback sound of the hi-fi system.

High-fidelity audio mainly consists of a sound source system, a pre-amplifier, a power amplifier and a speaker system. It can be seen from the figure that the composition of the high-fidelity audio system is relatively simple. There is only one main line from the beginning to the end. The simplicity of the circuit part should be considered, and the amplification link, various components and switches should be minimized in the circuit to reduce its influence on the audio signal. If there are more amplification links in the circuit, the waveform of the signal will change geometrically after the signal is input from the input terminal to the output terminal, and this form change is the distortion of the signal. Due to the quality of the components used, the circuit structure of the amplifier itself, the quality of the power supply and other factors, the amplifier will more or less have a certain impact on the amplified signal. If there are more amplification links in the entire circuit, the corresponding The greater the distortion is, the more the playback sound of the equipment will not be able to produce high-fidelity effects.

Audio enthusiasts can generally find that there are more various function switches on the panel of some medium and low-end audio equipment, but on the contrary, the more high-end equipment, the fewer switches on the panel, and there is only one power supply on some power amplifiers. switch and volume control switch. Friends who are new to audio equipment may think that this kind of equipment is too simple, and feel that the more functions there are, the more complicated the internal circuit of the equipment is, and the grade is of course higher. One more switch in the circuit is equivalent to adding a resistor in series in the circuit.

As we all know, resistance has a hindering effect on the movement of charges. Although the switches or jacks of some equipment are plated with 24K gold, the resistivity is small, but there is still a certain resistance value. If a certain number of various switches are added to the circuit, it will have a certain impact on the transmission of signals, especially for smaller signals. Some audiophiles often feel that some subtle sound changes can be heard on this set of equipment, but not on another set of equipment when they try to replay the equipment. This is part of the reason. Of course, other factors such as the circuit structure, the quality of the selected components, etc. will also cause the loss of tiny signals. In some low-end popular audio equipment, the manufacturer has designed some function switches on the machine for the convenience of most consumers. This kind of equipment has poor performance on some subtle changes in the signal.

To sum up, the simpler the circuit of the high-fidelity audio system, the smaller the loss of the electrical signal during transmission, the smaller the influence of the circuit on the electrical signal, the smaller the distortion, and the better the sound quality of the playback. good. When making a high-fidelity audio system, we also pay more attention to the materials used, for example: the signal output and input jacks are made of gold-plated non-magnetic jacks; the signal output lines are made of high-purity oxygen-free copper materials; the final output is made of Some of the more famous dedicated audio pair tubes and so on. From the point of view of its production process, the high-fidelity audio system is very particular about the arrangement, direction and welding quality of internal components, such as the isolation of the pre-amplification part and the post-amplification part, and the use of "ground" in the circuit board to amplify small signals. The circuit is shielded and isolated, etc. These factors have a certain impact on the playback effect of the equipment. If a certain equipment only pays attention to the selection of components and does not pay attention to its manufacturing process, then its playback sound will definitely be affected.

From the perspective of playback sound, the high-fidelity audio system is very particular about expressing the connotation and details of music. Through the playback of equipment, it can show the profound meaning of music and communicate with the audience emotionally. It should be able to express the subtle sounds in the music. For example, it can often be seen from audio review articles that when the equipment is replaying the music played by the violin, it will produce a "pine scent". The subtle sound produced when the first string rubs against each other is fully revealed.

Most friends who like music know the famous violin concerto "Liang Shanbo and Zhu Yingtai" in our country. If you use a high-fidelity sound system to replay this piece, you can use it from the violin's weeping performance for 20 minutes. Appreciators can experience the whole process of the birth and development of the love tragedy between Liang Shanbo and Zhu Yingtai, which can easily resonate with the appreciators and bring them to the fairy tale of "the rainbow is thousands of miles away, a hundred flowers bloom, butterflies are in pairs among the flowers, and the millennia and generations are inseparable". The realm makes people cry. Most of the more senior audio enthusiasts have heard the CD "Walking My Way" published by Hong Kong Hugo Company. Through the playback of the equipment, the listener seems to be in a remote, ethereal, and hopeless world. performance of content.