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本文介绍一种具有抑制低重频,脉冲积累功能的灯光告警电路。它的输入信号来自接收机的脉冲串,首先对脉冲串进行重频选择,也就是低频抑制,把低于基准 A 重频的信号抑制掉,只允许高于基准 A 重频的信号通过,然后对该信号的脉冲个数进行积累,当脉冲个数满足要求时,其输出再加至发光二极管,使二极锊发亮,如图1所示。这种电路广泛地用于告警接收机,但以往的电路大都是模拟的,性能不易控制,而这里介绍的电路是数字式的,性能稳定,简单易行,便于集成,特别适合于多路系统。下面分别介绍重频选择和频率积累的原理及电路。
This article describes a suppression of low-frequency, pulse accumulation function of the light alarm circuit. Its input signal from the receiver’s burst, the first pulse sequence to select the frequency, that is, low-frequency suppression, the signal below the A reference frequency suppression suppressed, allowing only higher than the reference A frequency signal through, and then The number of pulses on the signal accumulation, when the pulse number to meet the requirements, the output is added to the light-emitting diode, so that the diode shines, as shown in Figure 1. This circuit is widely used in alarm receivers, but most of the previous circuits are analog, the performance is not easy to control, and the circuit described here is digital, stable performance, easy to integrate, easy to integrate, especially for multi-channel system . Introduced below the principle of frequency selection and frequency accumulation and circuit.