What is the production and working principle of audio?

The simplest sound system includes sound source, power amplifier and speaker, all of which are indispensable. The quality of these devices basically determines the quality of the whole system. Among them, the power amplifier, as the power of the sound system, plays a bridge role between the sound source and the sound box. The working principle of power amplifier is actually very simple. Intuitively speaking, it is to amplify various sound signals played by the sound source to promote the speaker to produce sound. From a technical point of view, a power amplifier is like a current modulator. It converts alternating current into direct current, and then it is controlled by the sound signal played by the sound source, and transmits different currents to the speaker at different frequencies, so that the speaker can emit sounds of corresponding size and frequency. Considering the differences in power, impedance, distortion, dynamics, application scope and control and adjustment functions, different power amplifiers have different internal signal processing, circuit design and production technology. The traditional power amplifier has experienced decades of development, and there is no special classification. Until recent years, with the development of audio and video playback equipment and the enrichment of video software, many audio manufacturers have designed and produced different types of integrated power amplifiers with different technical characteristics on the basis of traditional power amplifiers and referring to the sound playback characteristics of real theaters. People call it AV power amplifier, and correspondingly, the power amplifier simply used to enjoy music is called pure music power amplifier. According to the current demand of audio consumption, the power amplifiers in civil audio have basically been divided into two categories, namely pure music power amplifiers and home theater AV power amplifiers. Pure music power amplifier The design of pure music power amplifier emphasizes the lowest signal distortion, faithfully shows the scenes, details and playing and recording skills of music, so as to meet people's requirements for the best appreciation of music. This is what people often call Hi-Fi. In the design and production, the requirements of pure music power amplifier are extremely strict. With reasonable high-quality pure music amplifiers and speakers, there is high fidelity of music, which can make many people infected by music. This is why there are still many people with high cultural literacy who are addicted to pure music audio today. Even many people who initially pursued the AV trend have a certain understanding of audio, and then they began to appreciate Hi-Fi music, which shows the charm of Hi-Fi. The quality of pure music power amplifier is not entirely determined by its technical indicators. We can't just look at how high the power is, how wide the frequency response is, and how low the distortion is. We should pay special attention to its design and production process and the clarity of music. For example, the courage machine with low technical index is better than many transistor power amplifiers. In addition, the pure music amplifier also pays special attention to the reasonable collocation with the speaker. A good amplifier pushing a speaker may not necessarily push a speaker well. When actually matching, we should refer to their working types, impedance characteristics, sensitivity and output current, which requires actual audition. Here are two pure music amplifiers with high cost performance for your reference. ARCAM) alpha 5 amplifier. Anyone who is a little familiar with the fever stereo will not be unfamiliar with the British-made "Yajun". Although small, light and humble, even plain and stingy, at an exhibition a few years ago, everyone doubted whether such a small amplifier could promote the fever speaker, and even dared not expect its sound quality performance. However, when it calmly and proudly promoted Tianlang speakers, everyone was impressed by its small body and such excellent performance, and it was "elegant". Its ALPHA series power amplifier is a model introduced after some improvements on the basis of the original DELTA series. The design adopts pure A-class structure. In order to reduce signal distortion, the internal circuit is also very simple, and the component model is nothing special. However, due to the strict requirements of manufacturing technology and materials, Yajun's ALPHA series amplifiers have extraordinary sound quality even if they seem simple. In the actual audition, the sound quality of Yajun ALPHA5 and Tianlang 607 speakers (sound source is Yajun ALPHA 1 CD player) produced by the same company can be said to be almost perfect, especially when listening to strings and vocals, the analytical power of ALPHA5 makes the advantages of Tianlang speakers fully displayed. When playing Vivaldi's Four Seasons, every note of the violin is coherent, clear and pleasing to the ear. Listening to "Old Songs of Cai Qin", the singer's every breath and articulation are very clearly displayed, which is kind and touching, and quite consistent with the style of this CD. Although the output power of ALPHA5 per channel is only 40W at 8Ω, as an authentic British Class A amplifier, it is absolutely no problem to push most high-level speakers well, and it can be clean and tidy at the climax of music, and it is definitely not sloppy. At the same time, the price of ALPHA5 is only about 3000 yuan, but it combines the advantages of transistor machine and courage machine, and it can really be said to be a value-added device.