With the continuous update and development of power amplifier technology and the improvement of technology, more and more electronic smart products appear in our lives. Power amplifier is a knowledge, good sound quality and a good power amplifier chip are essential, so how to judge How to choose a good professional digital power amplifier chip?
1. According to the technical strength of the manufacturer
Distinguishing professional digital power amplifier chips can be confirmed by the technical strength of their manufacturers. Strict process and technology are required to manufacture high-quality and reliable chips. Therefore, the level of technical strength of manufacturers, such as scientific research level, production efficiency, equipment and production lines To a certain extent, it reflects its production technology strength. If the conference audio equipment manufacturer with guaranteed production technology can use various technologies and processes proficiently, and each step of production has undergone strict inspection and testing, In order to ensure compliance with quality standards, in the field of digital power, Korea NF is the leader.
2. According to the technical parameter information
Differentiating and evaluating the quality of professional digital power amplifier chips should first pay attention to specific configuration parameters. The technical parameters that can reflect audio quality mainly include capacitor impedance, frequency response, distortion, speaker unit, rated power, etc. By consulting and understanding these parameters, you can have a preliminary impression of its practical quality. If the conference audio equipment is of good quality, then various parameters are naturally complete and reasonable. You can get a certain listening experience through audition and enjoy a comfortable audio playback experience. feel. South Korean NF has unique technical patents, such as NS noise reduction algorithm, APEQ function adjustment, virtual 3D, etc., which greatly enhances and optimizes the sound output effect. Even better, all functions can be controlled by IIC, which is very convenient in design and use, and has a wider range of applications, which has won a good reputation in the market.
3. According to external reviews and word-of-mouth
The popularity and word of mouth of any product in the outside world will directly reflect the degree of recognition of its actual use in the market. As long as the quality of the product is good, the manufacturer's service attitude is good, and the response speed is fast, it will naturally be easy to obtain in the market. High evaluation sound benefits, the Korean NF digital power amplifier series represented by Gongcai.com has been well received and loved in China.
The basic principle of digital power amplifier: use the pulse signal PWM to drive the high-speed power switch, where the low-frequency part of the PWM signal contains the modulation signal. This signal is passed through a low-pass filter, which reproduces the modulated signal to the load (speaker). In essence, the difference between amplifying analog signals with traditional analog power amplifiers is: digital power amplifiers directly amplify digital audio signals, and then perform high-precision D/A conversion, so the efficiency is as high as 85%; excellent fidelity, THD+N (total harmonics) Distortion + Noise) is less than 0.05%.
The basic structure of digital power amplifier is composed of PWM modulator, H-bridge switching amplifier circuit and low-pass filter. The PWM modulator converts the input digital audio signal into a PWM signal, and the H-bridge switch amplifier circuit controls the on-off of the DC power supply, and uses the PWM signal current to supply power to the load. The low-pass filter can filter out the switching components and smooth the output waveform, so as to obtain the audio signal of the analog waveform.
The advantages of South Korea's NF digital power amplifier chip:
1. It has a 96KHz/24Bit audio data processing core, which meets the Hi-Res audio system standard;
The design of 2nd and 3rd stage DRC + POST DRC effectively limits the power output without affecting the sound quality;
3. The APEQ patented technology of Korean NF company gives full play to the maximum performance of the loudspeaker;
4. The patented 3D sound effect of Korean NF company can make the sound sound more natural and vivid;
5. The floating-point operation method, compared with the processing method of integer operation, the floating-point operation produces less noise;
6. Multi-terminal PEQ adjustment, all products have more settable PEQ points than similar products;
7. South Korea's NF power amplifier is a power amplifier with ASRC function, which can adapt to the change of sampling rate of 8K-192K;
8. The unique noise reduction technology of South Korea's NF power amplifier can effectively eliminate the noise floor affected by the power supply;