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扩声系统的总增益在各种设备的每级“放大器”中的分配是系统设计和调试的关键,如果各级增益紊乱,会使系统和设备的信噪比、失真度、动态范围、动态裕量、声音回授抑制能力、功率输出等性能受到严重影响。所以,围绕信噪比和噪声系数,对音频系统及设备的设计和调试作些简析,以得到系统总增益与每个设备增益的关系。最后具体给出系统增益和每个设备增益的预置、设备音量表的最佳范围、系统增益的最佳分配。
The total gain of a PA system is the key to system design and tuning for each stage of amplifier at various stages. If the gain at all stages is disrupted, the SNR and distortion of the system and equipment, the dynamic range , Dynamic margin, voice feedback suppression, power output and other properties are seriously affected. Therefore, around the signal to noise ratio and noise figure, the audio system and equipment design and debugging some analysis to get the total system gain and the relationship between the gain of each device. Finally give the system gain and gain of each device preset, the best range of the device volume meter, the optimal distribution of system gain.