发明授权
EP0213651B1 Receiving equipment for the recognition of a number of different and predetermined frequency combinations of voice-frequency signalling components under the protection of a spurious-signal/voice-signal guard function 失效
接收设备用于识别在保护信号/语音信号保护功能下的声频信号组件的不同和预定的频率组合的数量

Receiving equipment for the recognition of a number of different and predetermined frequency combinations of voice-frequency signalling components under the protection of a spurious-signal/voice-signal guard function
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