Telecommunications – Radiotelephone system
Patent
1996-02-22
1999-03-23
Chin, Wellington
Telecommunications
Radiotelephone system
455424, 455560, 455550, H04Q 722, H04Q 724
Patent
active
058872485
ABSTRACT:
An audible tone signal service apparatus of the digital mobile services switching center designs a separate board which transmits audible signal tone only to simplify a hard ware construction of a USTA and to process 32 channel per sheet of the USTA board. Thus, a generally-designed signal processing circuit pack which heretofore processes all R2 MFC, DTMF signal, CCT signal and audible signal tone to inevitably adopt digital signal processors, I/O memories and a receiving sections which were not required for the audible signal tone transmitting service but provided due to the structural aspect of the USTA is separately designed as a board assembly of processing the R2, MFC, DTMF and CCT signals and an audible signal tone transmitting board assembly.
REFERENCES:
patent: 4633460 (1986-12-01), Suzuki et al.
patent: 4756018 (1988-07-01), Fujiwara
patent: 4860281 (1989-08-01), Finley et al.
patent: 4862452 (1989-08-01), Milton et al.
patent: 4995033 (1991-02-01), Ikemori
patent: 5091904 (1992-02-01), Back et al.
patent: 5297191 (1994-03-01), Gerszberg
patent: 5425031 (1995-06-01), Otsuka
Ahn Kwang Bok
Jang Chul Ho
Chin Wellington
Ferguson Keith
Hyundai Electronics Industries Co,. Ltd.
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