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扬声器的主要特性是灵敏度频率响应,习惯上指幅度频率特性。通常是在消声室内用正弦信号扫描方法测量。扬声器的测量技术从50年代以来进展缓慢。考虑到语言和音乐本质上是一种瞬态信号,因此一度建议使用猝发声、阶梯波和脉冲来测量扬声器的响应。但是在使用模拟式测量设备时,脉冲的能量很小,使信噪比很低,数据分析也有困难,使它们无法实用。最近,数字计算机的应用,快速傅里叶变换的出现,使一种测量扬声器脉冲响应再计算其转移函数的新方法获得了实际应用。它不但用于扬声器的设计和研制,也已应用于生产中。
The main characteristic of the loudspeaker is the sensitivity frequency response, customarily refers to the amplitude frequency characteristic. Usually in the anechoic chamber with a sinusoidal signal scanning method to measure. Speakers’ measurement technology has been slow to progress since the 1950s. Given that speech and music are intrinsically a transient signal, it was once suggested to measure the loudspeaker response using bursts, stair waves and pulses. However, when using analog measuring equipment, the pulse energy is very small, so that the signal to noise ratio is very low, the data analysis is also difficult, making them impractical. Recently, the application of digital computers and the appearance of fast Fourier transforms have led to a practical application of a new method of measuring the impulse response of a loudspeaker and then recalculating its transfer function. It is not only used for the speaker design and development, has also been used in production.