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发明公开
CN104661073A 一种用于多媒体数字播放系统的频移解调器电路 无效 - 撤回

一种用于多媒体数字播放系统的频移解调器电路
摘要：
本发明公开了一种用于多媒体数字播放系统的频移解调器电路，包括第一电容至第六电容、第一电阻至第七电阻、第一电位器、第二电位器、第一放大器至第三放大器、三极管、第一二极管和第二二极管，第一电容、第一电阻、第二电容和第一放大器组成第一有源低通滤波器，第四电容、第五电阻、第五电容和第三放大器组成第二有源低通滤波器，通过第一有源低通滤波器和第二有源低通滤波器来进行频移解调。本发明中第一电容、第一电阻、第二电容和第一放大器组成第一有源低通滤波器，第四电容、第五电阻、第五电容和第三放大器组成第二有源低通滤波器，该频移解调器电路在对频率偏移小的信号解调时，也能稳定工作，且具有结构简单和造价低的特点。
摘要（英）：

The invention discloses a frequency shift demodulator circuit for a multimedia digital playing system. The frequency shift demodulator circuit comprises first to sixth capacitors, first to seventh resistors, a first potentiometer, a second potentiometer, first to third amplifiers, a triode, a first diode and a second diode, wherein the first capacitor, the first resistor, the second capacitor and the first amplifier form a first active low-pass filter; the fourth capacitor, the fifth resistor, the fifth capacitor and the third amplifier form a second active low-pass filter; the first and second active low-pass filters are used for frequency shift demodulation. According to the frequency shift demodulator circuit, the first capacitor, the first resistor, the second resistor and the first amplifier form the first active low-pass filter, and the fourth capacitor, the fifth resistor, the fifth capacitor and the third amplifier form the second active low-pass filter, so that the frequency shift demodulator circuit can work stably when being used for demodulating a signal with slight frequency shift; moreover, the frequency shift demodulator circuit has the characteristics of simple structure and low construction cost.

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