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由西德罗德与施瓦茨公司(Rohde & Schwanz Co.)研制的D2-MAC代用信号中频调制器SBKE提供符合于德广联标准(FuBK)的标准图像/伴音中频测试信号,在节目中断或宽带通信系统发生故障时,把这种图形作为代用信号加到受损频道上。在这种测试图形中,可以插入几行文字并能对这种文字进行编程。对于左声道和右声道,分别产生1kHz和5kHz的正弦波信号,用作内部立体声测试信号。
The D2-MAC Proxy Signal Intermediate Frequency Modulator, SBKE, developed by Rohde & Schwanz Co., provides a standard picture / audio intermediate frequency test signal conformable to FuBK, Or the broadband communication system fails, this pattern is added as a substitute signal to the compromised channel. In this test pattern, a few lines of text can be inserted and the text can be programmed. For the left and right channels, a 1kHz and 5kHz sine wave signal is generated, respectively, for use as an internal stereo test signal.