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在普通房间混响场中，扬声器低频响应使用可控长度的短音（猝发音）来评价。与传统信号（如阶跃式正弦波和各种噪声信号）相比，短音拥有许多实用价值，还可对系统进行快速主观评价。
In a common room reverberant field, the speaker’s bass response is evaluated using a short length of controllable sound (burst tone). Short tones have many practical advantages over traditional signals such as step-wise sinusoids and various noisy signals and can quickly and subjectively evaluate the system.