Patent KR-100260398-B1 (KR)
Title: Device for preventing voice data from breaking in recorded announcement equipment for digital communicating switching system
Inventor: PARK JAE HAK
IPC: H04M3/42
Filed: 1998-02-18
Granted: 2000-07-01
Abstract: PURPOSE: A voice data damage preventing apparatus of a recorded announcement board in a digital mobile communication exchange is provided to reproduce a voice data without damage by generating an interrupt signal to a counter circuit according to a frame synchronous signal and synchronizing a generation time point of the interrupt signal and a generation time point of a lower address for fetching a voice data from a voice data memory. CONSTITUTION: A global service controller(100) controls transmission of a voice data stored in a digital mobile communication exchanger. A time switch (105) outputs a frame synchronous signal and a clock required for reproducing the voice data, switches the voice data reproduced under the control of the global service controller(100) to a pertinent channel and transmits it. A recorded announcement board(180) counts the frame synchronous signal outputted from the time switch (105) under the control of the global service controller(100), generates a lower address for fetching a voice data reproduction request interrupt signal and voice data, and fetches corresponding voice data by the generated interrupt signal and the lower address. The recorded announcement board(180) includes an input/output dual port RAM(170) for rendering data to be inputted or outputted between the global service controller(100) and a recorded announcement controller(170) for communication, a recorded announcement controller(140) for reading a voice data reproduction request message and message number data from a pertinent area of the input/output dual port RAM(170) and controlling a general operation of the recorded announcement board(180) so as for the corresponding voice data to be reproduced; a lower address counter (110) for counting the frame synchronous signal outputted from the time switch (105) and generating a signal for generation of a lower address and an interrupt to fetch a voice data, an interrupt generating and voice data manage preventing (120) for latching the signal or generating an interrupt outputted from the lower address counter (110) according to a clock for generating an interrupt outputted from the time switch (105) and generating an interrupt signal to prevent a voice data damage, a reproduction related data storing unit(145) for storing a data related to the voice data, an address dual port RAM(150) for storing a data required for fetching the voice data under the control of the recorded announcement controller(140), a memory selector(155) for selecting a corresponding voice data of a vice data memory (165) according to a voice data select signal fetched from the address dual port RAM(150), an upper address counter (160) for generating an upper address of the voice data memory (165) so as for the voice data to be fetched according to a reproduction time of the voice data fetched from the address dual port RAM(150), and a voice data memory (165) for storing the voice data for a recorded announcement service of the digital mobile communication exchange.