Because normally the electro-acoustic equipment, technical specifications are given quasi-average noise level, rather than quasi-peak noise level, this should be noted.
因为通常电声设备技术指标给出的是噪声准平均值电平，而不是噪声准峰值电平，这一点应加以注意。
2
Three kinds of programmable gain amplifier circuit are introduced in this article. Their applications to electro-acoustic system are introduced, too.
介绍了程控增益放大器三种电路实现方式，以及这几类电路在电声系统中的应用。
3
The paper analyzes its two-voice parts and the organization of the acoustic material, and discusses the characteristics of polyphony manifested in the electro-acoustic music.