| 摘要 |
<p>An optional card including a DSP for use by a modem daughter board, where the modem daughter board is equipped with a data access arrangement (DAA) for upgrading a computer system to include modem and facsimile capabilities. The optional card may preferably be a sound board including a DSP and bus controller for interfacing with the I/O bus of the computer system, and a CODEC and connector for receiving and interfacing the daughter board modem to the DSP. In an alternative embodiment, the DSP is provided on the system board coupled to the host bus or the I/O bus of the computer system, and the modem functions, including a CODEC and DAA, are provided on an optional modem card. The CODEC includes logic for transferring digitized analog data to main memory as controlled by the CPU of the computer system. Modem software is provided to control communications and transfer of data in any of the embodiments.</p> |
