The working principle of the power amplifier is actually very simple. Intuitively, it is to amplify various sound signals played by the sound source to promote the sound of the speaker. From a technical point of view, a power amplifier is like a current modulator, which converts alternating current into direct current, and then is controlled by the sound signal played by the sound source, and transmits different currents to the speaker according to different frequencies, so that the speaker emits corresponding size. The sound of the corresponding frequency. Due to consideration of power, impedance, distortion, dynamics, and different range of use and control adjustment functions, different power amplifiers have different internal signal processing, circuit design, and production processes. Traditional amps have experienced decades of development, and there has been no special classification. Until recent years, with the development of audio and video playback equipment and the richness of video software, many audio manufacturers have referenced the real cinema on the basis of traditional power amplifiers. The characteristics of sound playback, design and production of a variety of different types of technical characteristics of the integrated power amplifier, people call it AV power amplifier, correspondingly simply use the power amplifier to listen to music is called pure music amplifier. According to the current demand for audio consumption, the amplifiers in civilian audio have been basically shaped into two categories, namely pure music amplifiers and home theater AV amplifiers.
Pure music amplifier
The pure music amp design emphasizes the lowest signal distortion, faithfully displays the music scene, details and performance, recording skills to meet people's best appreciation of music requirements, which is often referred to as Hi-Fi. Pure music amplifiers are extremely demanding in design and production. With a high quality pure music amplifier and speakers with high music fidelity, many people can be infected with music, which is why in the home theater today, there are still many people with high cultural accomplishment. The reason for the pure music sound, even a lot of people who originally pursued the AV trend have a certain understanding of the sound, and then start to enjoy Hi-Fi music again, it also shows the charm of Hi-Fi.
The quality of pure music amplifiers is not completely determined by its technical indicators. It is not easy to see how high the power is marked, how wide the frequency response is, and how low the distortion is. Instead, it should pay special attention to the design and production process and the resolution of music. . For example, a amp that is not too high in technical specifications is better than many transistor amps. In addition, pure music amplifiers are especially concerned with the reasonable mix of speakers, in the actual mix should refer to their work type, impedance characteristics, sensitivity and output current, and need to actually audition.
AV amplifier
AV power amplifier is an independent video and audio control equipment formed on the basis of traditional power amplifiers with the development of video playback equipment and software, generally including a power amplifier part and a signal control processing part. The principle of the power amplifier is no different from the traditional power amplifier, except that several channels are added, that is, several power amplifiers are combined; the signal control processing part involves signal sound, video selection, signal decoding processing, and signal. Sound field processing and functions such as radio and monitoring. It can be seen that compared with the traditional power amplifier, the AV power amplifier has undergone a qualitative change in function, so strictly speaking, most AV power amplifiers should be called AV centers. The formation of the AV center satisfies the requirements of modern families in the various media playback, display and processing of audio and video. It is indeed more in line with people's needs for entertainment and appreciation, but it is precisely because it is a "center" with multiple functions. Therefore, it is not easy to achieve a high level of performance in various parts, especially in the AV center's power amplifier part, the sound quality of most products is not satisfactory, perhaps this is where the AV amplifier needs to be improved.
As a power amplifier for AV, its channel power setting, the quality of the signal decoding processing portion, and the musical expression, sound quality, and convenience of operation as music enjoyment can all reflect its performance to some extent. Generally, a high-quality AV power amplifier should first have a better sound field reduction in the signal processing of the film and television program, the channel isolation is high, and the atmosphere rendering can not be too exaggerated; secondly, the sound quality performance of the power amplifier part, especially the main The sound quality of the channel should be as close as possible to a better pure music amplifier. Of course, the positioning of the AV amplifier is different from the pure music amplifier, and it is impossible to unrealistically demand how high the sound quality is.
Since the promotion of home theater equipment has been very popular by some media and merchants, many consumers who have just started to introduce audio have gradually formed a power amplifier that should have multi-channel, surround sound and other functions. The standard, this can not be said to be a misunderstanding. Hi-Fi equipment with better performance on music has almost no market, which makes it difficult for many people who like music to find high-quality pure music amplifiers. This phenomenon is really regrettable. Practically speaking, due to different specificities, home theater and pure music audio systems should be able to coexist, and home theaters do have advantages in meeting the general entertainment requirements of most people, but if it is called 2, 3 thousand yuan 7 sets of even more than 10,000 yuan can be set to maintain the momentum of a full set of home theaters, it will not only lead to a more unfavorable situation of pure music audio in a certain period of time, but also home theater is bound to take the old road of combined audio.
Take a deep breath, close your eyes, the world has the freshest oxygen ... Yu Quan's "Deep Breath" is well known to us, but as the environmental problems become more and more serious, the haze sky also increases, PM2.5 PM10 and so on Vocabulary has also been mentioned more and more, and air purifiers have quickly become popular on the market with this "air quality" trend. Along with this, the air-clean brand has sprung up, and various technologies are dazzling. Which ones are indeed effective and which are just tasteless propaganda? How does the Air Purifier bother us to get rid of pollution? And look at the editors for you.
Analysis of air purifier
The critical value of PM2.5 content is 75 μg / m3
The pollutants in the air mainly include soot, total suspended particulates, inhalable particulates (PM2.5) and fine particulates (PM10). The smaller the diameter of the particulates, the deeper the part that can enter the respiratory tract. 10 micron diameter particles It is deposited in the upper respiratory tract, and particles below 2 microns can penetrate 100% into the bronchiole and alveoli.
1k-5k air purifier prices vary greatly
The air purifier products on the market not only have various functions, but also have prices ranging from thousand yuan to tens of thousands. The pricing of imported products is generally higher than that of domestic brands. Except for the core technology of many brands, the promotion of purification effects is similar, and consumers need to choose according to demand.
The air quality standard of 74 key cities is only 4.1%
According to the data of the press conference held by the State Council Information Office on June 4, according to the new "Ambient Air Quality Standards", the six pollutants SO2, NO2, PM10, PM2.5, CO and O3 were evaluated, 74 new standards In the first phase of monitoring and implementation, the proportion of cities that met the ambient air quality standards was only 4.1%, and the other 256 cities implemented the old air quality standards, and the proportion of cities that met the standards was 69.5%.
Air purifier sales increased by 90.5% compared with last year
According to a report recently released by the China Electronics and Information Industry Development Institute, due to the haze weather, air purifiers have become the most concerned home appliance products, with sales of nearly 2.4 million units nationwide last year, a year-on-year increase of 90.5%; retail The amount reached 5.6 billion yuan, a year-on-year increase of 105.9%.
HEPA filter needs to be replaced in March
The filter of the air purifier is the same as the filter of the water purifier, and it is not effective for a long time. After long-term use, the accumulation of dust on the surface of the filter will also cause the filter to gradually fail. Therefore, when the haze is more serious, the non-washable HEPA filter needs to be replaced every three months.
Merchants claim that the purification rate is more than 99% for the concept of stealing
99% or even 99.99% seems to have become a slogan for many air purifiers on the market. Many brands of products promote their high removal rate of PM2.5 and formaldehyde. In fact, this kind of publicity is more of a kind. The slogan of stealing the concept, the removal rate of 99% is the effect of the material itself on PM2.5 and formaldehyde, not the effect of actually running in space.
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