| 摘要 |
PURPOSE: A keyphone system having various ring cadences and BGM(Back Ground Music) is provided to share ring cadences and BGM in a keyphone system, so that a user can use various music sources, thereby being differentiated from an existing keyphone system. CONSTITUTION: An analog switch(101) selects one of the inner music sources. A CODEC(102) converts the selected music signal into a digital signal. A DSP(Digital Signal Processor)(104) compresses and restores an outer music source signal inputted through a external connection port. A memory(105) stores the inputted outer signal. An ASIC(Application Specific Integrated Circuit)(103) transmits the converted digital signal and the compressed/restored digital signal to a back plane of a system in order to share the digital signal converted from the CODEC(104) and the digital signal compressed/restored from the DSP(104).
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