| 摘要 |
Two digital keyphones are connected in one line. The digital keyphone system includes a digital telephone connector for connecting two digital keyphones in one line, a transformer for interfacing digital audio signal and control data and for supplying power to digital telephones, a first digital receiver-transmitter for interfacing two digital audio signals transmitted through B channels and control data transmitted through D channels, an A/D converter for converting digital audio signal to analog audio signal, and a second digital receiver-transmitter for outputting digital audio signal selected by the second selection signal and control data via the transformer and the digital telephone connector.
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