| 摘要 |
The dialler is constituted by a stabilised supply source, a clock generator, a time base generator, a control logic block, an initiation block, a keyboard interface, a dialling generator, a code converter and a timing controller, a pulse module and flash, DTMF counters/controllers for the two frequency ranges, digital/analogue type converters for the two frequency ranges and an output filter for the DTMF signal, which same, due to the joint operation of all the blocks referred to, permit the use of the invention as a pulse dialler, multifrequency dialler, redial actuator and to send multifrequency-encoded numerical data. <IMAGE>
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