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GB50371-2006 声学特性指标4.2.1 文艺演出类扩声系统声学特性指标应符合表4.2.1中的规定。表4.2.1文艺演出类扩声系统声学特性指标等级最大声压级（dB）传输频率特性传声增益(dB)稳态声场不均匀度(dB)早后期声能比(可选项) (dB)系统总噪声级 一级额定通带注内：大于或等于106dB以808000Hz的平均声压级为0dB，在此频带内允许范围：-4dB+4 dB； 4080Hz和800016000Hz的允许范围见图4.2.1-11008000Hz的平均值大于或等于-8dB100Hz时小于或等于10dB；1000Hz时小于或等于6dB；8000Hz时小于或等于8dB5002000Hz内1/1倍频带分析的平均值大于或等于+3dBNR-20二级额定通带内：大于或等于103dB以1006300Hz的平均声压级为0dB，在此频带内允许范围：-4dB+4 dB；50100Hz和630012500Hz的允许范围见图4.2.1-21256300Hz的平均值大于或等于-8dB1000Hz、4000Hz小于或等于8dB5002000Hz内1/1倍频带分析的平均值大于或等于+3dBNR-20注：额定通带是指优于表4.2.1表4.2.3中传输频率特性所规定的通带。图4.2.1-1文艺演出类一级传输频率特性范围 图4.2.1-2文艺演出类二级传输频率特性范围4.2.2 多用途类扩声系统声学特性指标应符合表4.2.2中的规定。表4.2.2多用途类扩声系统声学特性指标等级最大声压级（dB）传输频率特性传声增益(dB)稳态声场不均匀度(dB) 早后期声能比(可选项) (dB) 系统总噪声级 一级额定通带内：大于或等于103dB以1006300Hz的平均声压级为0dB，在此频带内允许范围：-4dB+4 dB；50100Hz和630012500Hz的允许范围见图4.2.2-11256300Hz的平均值大于或等于-8dB1000Hz时小于或等于6dB；4000Hz时小于或等于8dB5002000Hz内1/1倍频带分析的平均值大于或等于+3dBNR-20二级额定通带内：大于或等于98dB以1254000Hz的平均声压级为0dB，在此频带内允许范围：-6dB+4 dB；63125Hz和40008000Hz的允许范围见图4.2.2-21254000Hz的平均值大于或等于-10dB1000Hz、4000Hz时小于或等于8dB5002000Hz内1/1倍频带分析的平均值大于或等于+3dBNR-25 图4.2.2-1多用途类一级传输频率特性范围 图4.2.2-2多用途类二级传输频率特性范围4.2.3 会议类扩声系统声学特性指标应符合表4.2.3中的规定。表4.2.3会议类扩声系统声学特性指标等级最大声压级（dB）传输频率特性传声增益 (dB)稳态声场不均匀度(dB) 早后期声能比(可选项) (dB)系统总噪声级一级额定通带内：大于或等于98dB以1254000Hz的平均声压级为0dB，在此频带内允许范围：-6dB+4 dB；63125Hz和40008000Hz的允许范围见图4.2.3-11254000Hz的平均值大于或等于-10dB1000Hz、4000Hz时小于或等于8dB5002000Hz内1/1倍频带的平均值+3dB、STI-PA0.5NR-25二级额定通带内：大于或等于95dB以1254000Hz的平均声压级为0dB，在此频带内允许范围：-6dB+4 dB；63125Hz和40008000Hz的允许范围见图4.2.3-21254000Hz的平均值大于或等于-12dB1000Hz、4000Hz小于或等于10dB5002000Hz内1/1倍频带的平均值+3dB、STI-PA0.5NR-254.2.4 多声道扩声系统中，中央声道、左+右声道的扩声均应分别满足其相应的规定。 图4.2.3-1会议类一级传输频率特性范围 图4.2.3-2会议类二级传输频率特性范围 表4.2.4体育馆类扩声系统声学特性指标等级最大声压级（dB）传输频率特性传声增益 (dB)稳态声场不均匀度(dB) 语音清晰度指数STI-PA 系统总噪声级一级额定通带内：大于或等于105dB以1254000Hz的平均声压级为0dB，在此频带内允许范围：-4dB+4 dB；63125Hz和40008000Hz的允许范围见图4.2.4-11254000Hz的平均值大于或等于-10dB1000Hz、4000Hz时小于或等于8dB0.5没有明显可察觉的噪声二级额定通带内：大于或等于100dB以1254000Hz的平均声压级为0dB，在此频带内允许范围：-6dB+4 dB；63125Hz和40006300Hz的允许范围见图4.2.4-21254000Hz的平均值大于或等于-12dB1000Hz、4000Hz小于或等于10dB0.5没有明显可察觉的噪声三级额定通带内：大于或等于95dB以2504000Hz的平均声压级为0dB，在此频带内允许范围：-10dB+4 dB2504000Hz的平均值大于或等于-12dB1000Hz、4000Hz小于或等于10dB0.5没有明显可察觉的噪声图4.2.4-1体育馆类一级传输频率特性范围 图4.2.4-2体育馆类二级传输频率特性范围图4.2.4体育馆类一、二级传输频率特性范围（考虑其多用途功能）表4.2.5体育场类扩声系统声学特性指标等级最大声压级（dB）传输频率特性传声增益 (dB)稳态声场不均匀度(dB) 语音清晰度指数STI-PA 系统总噪声级一级额定通带内：大于或等于105dB以1254000Hz的平均声压级为0dB，在此频带内允许范围：-6dB+4 dB；63125Hz和40008000Hz的允许范围见图4.2.5-11254000Hz的平均值大于或等于-10dB1000Hz、4000Hz时小于或等于8dB0.5没有明显可察觉的噪声二级额定通带内：大于或等于100dB以1254000Hz的平均声压级为0dB，在此频带内允许范围：-6dB+4 dB；63125Hz和40006300Hz的允许范围见图4.2.5-21254000Hz的平均值大于或等于-12dB1000Hz、4000Hz小于或等于10dB0.5没有明显可察觉的噪声三级额定通带内：大于或等于95dB以2504000Hz的平均声压级为0dB，在此频带内允许范围：-10dB+4 dB2504000Hz的平均值大于或等于-12dB1000Hz、4000Hz小于或等于10dB0.5没有明显可察觉的噪声图4.2.5-1体育场类一级传输频率特性范围 图4.2.5-2体育场类二级传输频率特性范围 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