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80C188 Datasheet(PDF) 4 Page - Intel Corporation |
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80C188 Datasheet(HTML) 4 Page - Intel Corporation |
4 / 9 page The dual-processor combination also performs the follow- ing outbound dialing and call progress monitoring: ■ transmits an off-hook signal to the telephone network ■ dials out (makes an outbound call) ■ monitors and reports results — line busy or congested — operator intercept — ring, no answer — or if the call is answered, whether answered by a person, an answering machine, a facsimile machine, or a modem When recording speech, the DSP can use different digi- tizing rates from 24 Kb/s to 64 Kb/s as selected by the application for the best speech quality and most efficient storage. The digitizing rate can be selected on a channel- by-channel basis and can be changed each time a record or play function is initiated. Outbound processing is the reverse of inbound processing. The DSP processed speech is transmitted by the control microprocessor to the host PC for disk storage. When replaying a stored file, the microprocessor receives the voice information from the host PC and passes it to the DSP which converts the file into digitized voice. The DSP sends digitized voice to the CODEC to be converted into analog voice and then to the line interface for transmission to the telephone net- work. The on-board microprocessor controls all operations of the DIALOG/4 board via a local bus and interprets and executes commands from the host PC. This microprocessor ■ handles real-time events ■ manages data flow to the host PC to provide faster system response time ■ reduces PC host-processing demands ■ processes DTMF and telephony signals before passing them to the application ■ frees the DSP to perform signal processing Communications between this microprocessor and the host PC is via the shared RAM that acts as an input/out- put buffer, increasing the efficiency of disk file transfers. This RAM interfaces to the host PC via the XT/AT bus. All operations are interrupt-driven to meet the demands of real-time systems. All DIALOG/4 boards installed in the PC share the same interrupt line. When the system is ini- tialized, Spring Ware firmware to control all board opera- tions is downloaded from the host PC to the on-board code/data RAM and DSP RAM. This downloadable firmware gives the board all of its intelligence and enables easy feature enhancement and upgrades. 4 Intel® Dialogic® DIALOG/4 Voice Board Datasheet |
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