A²B总线协议测试解决方案
2025年08月14日 11:34 发布者:度纬仪器
一、引言随着汽车采用新的信息娱乐技术和先进的驾驶辅助系统(摄像头、微波雷达、激光雷达等),以及采用多种传感器测量不同数据(稳定性、速度、加速度等),汽车内部的电子系统数量增加,复杂性也达到了新高度。给通信总线也带来了巨大挑战。
许多不同子系统使用的各种总线都包含非常复杂(且昂贵)的电缆。对于汽车应用,尺寸和重量是新的挑战,因为要满足新的环境法规就意味着需要开发能够(例如)降低CO2排放量的新系统。在这种情况下,就不太容易满足高带宽、低延迟,确定性、耐用且便宜的通信总线需求了。汽车音频系统的电缆在总电缆重量中占了很大比重,这是因为模拟线路要求从音频源到端(扬声器)都采用价格高昂的屏蔽电缆。此外,主动降噪(ANC)和路噪消减(RNC)系统需要在车内安装多个麦克风,这为音频网络增加了许多输入节点。
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A5-A2B模块接口具有独立的Master与Salve,可提供与待测品的直接连接,同时还为辅助测试提供一个额外的电源输入接口。该接口结合功能强大的音频测试软件ATC,可实现A²B系统和组件的闭环多通道音频测试,如汽车车机、汽车功放、汽车麦克风及其他相关的消费类产品。
主要特点:
(1)A2B系统和组件的多通道音频测试
l 最高支持32通道的音频流输入与输出
(2)Master特性
l 可支持10个节点,并可独立访问各节点的I2C和GPIO
l 总线负载能力8V@500mA
l 下行音频流可达32通道,THD+N≤-186dB
l 对已连接的节点可进行扫频测试
(3)Slave特性
l 灵活的配置,可作为输入或者输出接入A2B网络
l 可高达32通道的音频输出
l 独立的Master和Slave,可同时使用
(4)支持外部电源输入(DC 12V)