记录器喷气放大器的线性响应反射系数
Linear-response reflection coefficient of the recorder air-jet amplifier
摘要：
在一个管道长笛，如录音机，稳态振荡是由两个参数，吹压力和频率的声学谐振器。与大多数反馈振荡器一样，振荡幅度由放大器的增益饱和度决定，因此，除非反馈回路打开，否则无法独立于吹制压力和频率进行控制。在这项工作中，通过用波导反射计替换记录器主体来打开环路：一段带有麦克风的传输线，信号源和吸收终端。当从空气射流进入传输线的平均流未被阻挡时，空气射流放大器对于通过不涉及声学谐振器的反馈路径的边缘音调振荡是不稳定的。当它被阻塞时，空气射流稍微向外偏转，系统变得稳定。这样就可以在线性响应条件下测量喷气放大器的反射系数与吹气压力和声频的关系，避免了增益饱和的复杂性。研究结果为在最简单的条件下，在未知参数较少的情况下，对槽传动模型进行了揭示性的检验。讨论了各种笛形槽传动模型的优缺点。
英文摘要：
In a duct-flute such as the recorder, steady-state oscillations are controlled by two parameters, the blowing pressure and the frequency of the acoustic resonator. As in most feedback oscillators, the oscillation amplitude is determined by gain-saturation of the amplifier, and thus it cannot be controlled independently of blowing pressure and frequency unless the feedback loop is opened. In this work, the loop is opened by replacing the recorder body with a waveguide reflectometer: a section of transmission line with microphones, a signal source, and an absorbing termination. When the mean flow from the air-jet into the transmission line is not blocked, the air-jet amplifier is unstable to edge-tone oscillations through a feedback path that does not involve the acoustic resonator. When it is blocked, the air-jet is deflected somewhat outward and the system becomes stable. It is then possible to measure the reflection coefficient of the air-jet amplifier versus blowing pressure and acoustic frequency under linear response conditions, avoiding the complication of gain-saturation. The results provide a revealing test of flute drive models under the simplest conditions and with few unknown parameters. The strengths and weaknesses of flute drive models are discussed.
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