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在噪声和随机振动试验中,以及试验室标定某些仪器(如滤波器、振荡器等)时,都需要噪声发生器。一般常见噪声源是以稳压二极管或低压工作的运算放大器构成的。可见这种型式的噪声源性能受到温度和外加电压变化的影响。用数字电路-位移寄存器来构成噪声源时,不但技术性能可以提高很多,而且其输出频谱也易于控制。目前这种型式的噪声发生器大致以两种方式组成。一是以伪随机二进制顺序脉冲发生器构成噪声源,这是我们下面所要叙述的一种;二是以压控振荡器输出之和来构成可控频谱噪声源。
Noise and random vibration tests, as well as laboratory calibration of certain instruments (such as filters, oscillators, etc.) require a noise generator. Common source of noise is a voltage regulator diode or low voltage operational amplifier. This type of noise source can be seen by the temperature and applied voltage changes. When using a digital circuit-shift register to form a noise source, not only does the technical performance be much improved, but the output spectrum is also easy to control. At present, this type of noise generator generally consists of two modes. First, pseudo-random binary sequence pulse generator to form a noise source, which is what we have to be described below; Second, the sum of the voltage-controlled oscillator output to form a controllable spectral noise source.