Luohe where professional power amplifier monopoly wholesale Henan Luohe where where sell professional power amplifier Jiaming Yang 1503 +71780 +75 www.69139139.com 1399 +229 +631 Zheng * City Market Milan sun, Unit 2, Building 208 digital amplifier The sound quality, been many people Moxibustion good bass and shrill treble, in fact is the case in the product development process, but also found the problem. Us return to the principle of the digital amplifier: an audio signal (20 ~ 20K), a PWM modulation, and then by a switching power amplifier circuit, the PWM signal amplification, and finally through the filter, the PWM signal is filtered out, so that the remaining a high-power audio signal can directly drive speaker. This modulation process is the key of the digital amplifier. Generally popular several digital amplifier program PWM frequency are working in the range of 300K ~ 500k, some the the bass run even work in less than 100K frequency. The higher the frequency, the more difficult the selector switch tube, switching speed is slower, easy to heat, want to reduce fever, dead zone transfer large dead zone transfer large cause distortion larger. This is a dilemma of choice. Chosen so extremely fast switching tube is digital amplifier top priority. The sampling frequency of the digital amplifier directly determines the sound quality, this is an important phenomenon that we found in the process of the development of digital amplifier. For a simple example, you should have a good understanding of this principle. Assuming the PWM switching frequency of 300K (300 to 450K is now available in the market digital amplifier, the most common frequency) 1: If you enter a 20HZ low frequency signal into, then equal to a 20HZ low frequency signal cycle is divided into 15 000 sampling points This sampling point enough perfect expression of the output waveform of a sine wave bass can get a very good performance. 2: If you enter a 1K IF signal, he produced 300K/1K, is a cycle of 300 sampling points, this can still be accepted, but has started to deteriorate. 3: If you enter a 20K IF signal, produced only 300K/20K, is a cycle of 15 sampling points, has been unable to complete expression of a sine wave, personally think that this is the main treble deterioration ugly, let us Look, in the end how much the frequency is high for a good expression of an audio signal. If the PWM frequency is a 20K 100K input audio signal, and he can only 20K of a cycle-resolved five signal, which is obviously not, 100K maximum can be relatively good expression 1K signal (100 sampling points), so work as a subwoofer (20 to 250HZ) in 100K digital amplifier only. A 300K digital amplifier only perfect expression 5K (60 sampling points) treble. A 600K digital amplifier can better express 10K audio. When the operating frequency of 1 ~ 2M to real treble distortion reduction, reduce is not equal to the the perfect :) pursuit of higher frequency of each digital amplifier designers dream, but it must be based on more advanced devices ( higher operating frequency, power tube) Luohe where the professional amplifier monopoly wholesale Henan Luohe where where there sell professional power amplifier | Henan sell professional power amplifier Jiaming Yang www.69139139.com 1399 +229 1503 +71780 +75 + By 631 Zheng * City Market Milan sunlight Unit 2, Building 208