| 摘要 |
PROBLEM TO BE SOLVED: To widely use a voice sampling frequency band in an interphone internal network regardless of the specifications of voice Codec required for speech communication through an IP network. SOLUTION: When an entrance slave unit 2 and a master unit 3 are connected and an external device 5 is connected to the master unit 3 through the IP network 4, the master unit is provided with a sampling frequency conversion processing part 308 which performs conversion processing of a voice sampling frequency of an internal network in which a wide area frequency band for converting an analog voice signal into a digital data is used into a voice sampling frequency of an external network, and the voice Codec 309 for voice transmission which receives a conversion result of the sampling frequency conversion processing part and can have speech communication with the external device 5 through the IP network. COPYRIGHT: (C)2006,JPO&NCIPI
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