Class D amplification technology for the broadcast of.doc

Class D amplification technology for the broadcast of Abstract: The D amplification with its highly efficient amplification characteristics of digital audio amplification has been widely used in the fields. In this paper, the traditional D amplification carried out on the basis of its improved, and its application in the broadcast to do to explore. Keywords: Digital Broadcasting Group D amplification filtering SCM 1 Introduction The traditional power amplifiers are mainly A, B, A and B class and C class. Because people demand for audio power amplifier has become more efficient, energy-saving and miniaturization, so D power amplifier more and more attention. Class D amplifier is a digital power amplifier has many advantages, such as small size, big power, distortion, signal to noise ratio high, and the seamless integration of digital audio, can effectively reduce the signal interference between the transmission to achieve high-fidelity and so on. Now, most of the broadcasting system using a conventional power amplifier technology, efficiency is very low, if the concept of digital power amplifier to the introduction of the broadcast will be a novel attempt. This is a result of this attempt. Second, to achieve the program The system design block diagram shown in Figure 1, the digital signal generator selected microcontroller AT89C51. First, from the high-frequency oscillator to generate a frequency of 24MHz high-frequency oscillation signal, the signal generated by GAL variable frequency division, frequency division factor controlled by the AT89C51, sub-frequency signal by the D after the amplifier as the carrier signal. Low-frequency music signal is modulated signal, low-frequency signal through the audio amplification before being delivered to a high frequency carrier signal. Carrying a low-frequency signals out of the carrier signal through the antenna radiation. The role of the keyboard is an input to be received carrier signal frequency value and se