Title:
RADIO DIGITAL SUBSCRIBER TELEPHONE SYSTEM FOR SIMULTANEOUSLY PERFORMING MULTIPLEX VOICE COMMUNICATION OR DATA COMMUNICATION THROUGH SINGLE OR PLURAL CHANNELS
Document Type and Number:
Japanese Patent JP2979064
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To enable two kinds of bidirectional simultaneous call transmission at least with prescribed band width by enabling the simultaneous multiplex use of frequency inside an applied network and using low-speed digital voice coding.
SOLUTION: The receiving function of base station is essentially inverse to a transmitting function. Digital voice information from a PBX 15 is inputted to a CODEC 16. Then, four pieces of CODEC 16 belong to a VCU 17 and perform voice compression to the time slots of respective frequency channels. Then, a CCU 18 controls a TDMA function, extracts the transmission channel output of CODEC 16 of correspondent VCU 17 and transmits data to a modem 19 in proper format at the rate of 16k symbols/sec. An IF signal modulated by the modem 19 is converted to an RFUHF signal by an RFU 21 and sent through an antenna interface 22 to a transmission antenna. An RPU 20 is a central processing unit for transmitting connection data and control messages to the CCU.
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Inventors:
ERITSUKU PANESU
MAAKU JEI HANZERU
MAAKU JEI HANZERU
Application Number:
JP23659297A
Publication Date:
November 15, 1999
Filing Date:
July 11, 1997
Export Citation:
Assignee:
INTAADEIJITARU TEKUNOROJII CORP
International Classes:
H04B7/005; H04B7/04; H04B7/08; H04B7/26; H04J3/00; H04L65/00; H04J3/06; H04J4/00; H04L1/00; H04L1/06; H04L1/16; H04L1/18; H04L5/14; H04L5/22; H04L12/56; H04L27/18; H04M1/00; H04M3/00; H04M11/06; H04Q3/42; H04Q3/58; H04Q3/62; H04Q11/04; H04W4/18; H04W28/06; H04W36/06; H04W40/02; H04W56/00; H04W72/04; H04W72/12; H04W74/00; H04W74/04; H04W84/08; H04W84/14; H04W88/02; H04W88/08; H04J3/16; H04M11/00; H04W12/02; H04W12/10; H04W28/04; H04W28/14; H04W28/24; H04W28/26; H04W36/12; H04W52/00; H04W76/02; H04W84/00; H04M; (IPC1-7): H04Q7/38; H04M3/00; H04Q3/62; H04Q7/00; H04Q11/04
Domestic Patent References:
| JP5384603A | ||||
| JP4847752A | ||||
| JP56140730A |
Other References:
木下耕太、他、「ＴＤ−ＦＤＭＡ移動通信方式の検討」、電子通信学会論文誌別刷、Ｖｏｌ．Ｊ−６４−Ｂ、Ｎｏ．９、昭和５６年９月２５日、ｐ１０１６−１０２３
Attorney, Agent or Firm:
Uchihara Shin