CA2021847A1 - Radiotelephone system - Google Patents

Radiotelephone system

Info

Publication number
CA2021847A1
CA2021847A1 CA2021847A CA2021847A CA2021847A1 CA 2021847 A1 CA2021847 A1 CA 2021847A1 CA 2021847 A CA2021847 A CA 2021847A CA 2021847 A CA2021847 A CA 2021847A CA 2021847 A1 CA2021847 A1 CA 2021847A1
Authority
CA
Canada
Prior art keywords
receiving
sending
synchronizing signal
carrier frequencies
shifting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2021847A
Other languages
French (fr)
Other versions
CA2021847C (en
Inventor
Youichi Kawaguchi
Hajime Kikuchi
Kazuhiko Nishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ASCII Corp
Original Assignee
Youichi Kawaguchi
Hajime Kikuchi
Kazuhiko Nishi
Ascii Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP1195878A external-priority patent/JPH0831907B2/en
Priority claimed from JP1195877A external-priority patent/JPH0360233A/en
Application filed by Youichi Kawaguchi, Hajime Kikuchi, Kazuhiko Nishi, Ascii Corporation filed Critical Youichi Kawaguchi
Publication of CA2021847A1 publication Critical patent/CA2021847A1/en
Application granted granted Critical
Publication of CA2021847C publication Critical patent/CA2021847C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/725—Cordless telephones
    • H04M1/72502—Cordless telephones with one base station connected to a single line
    • H04M1/72505—Radio link set-up procedures

Abstract

ABSTRACT OF THE DISCLOSURE

A radiotelephone system having a base unit and a plurality of subordinate units for carrying out radiocommunication between them. The base unit has one or more sending sections and one or more receiving sections, and each of the subordinate units has a sending part and a receiving part. The system includes a first frequency varying part for shifting periodically sending carrier frequencies of the sending section as well as receiving carrier frequencies of the receiving section to make one sending or receiving carrier frequency at a phase different from that at another preceding phase, a first synchronizing signal part for generating a synchronizing signal in step with a time period determined from said shifting of those carrier frequencies of the base unit due to the first frequency varying part, a second synchronizing signal part for extracting a synchronizing signal from a receiving carrier signal of each receiving part of the subordinate units, and a second frequency varying part for shifting receiving and sending carrier frequencies of each subordinate unit to make one sending or receiving carrier frequency at a phase different from that at another preceding phase in step with a time period determined by the synchronizing signal.
CA002021847A 1989-07-28 1990-07-24 Radiotelephone system Expired - Fee Related CA2021847C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP195878/1989 1989-07-28
JP195877/1989 1989-07-28
JP1195878A JPH0831907B2 (en) 1989-07-28 1989-07-28 Wireless parent-child phone
JP1195877A JPH0360233A (en) 1989-07-28 1989-07-28 Synchronizing system for master/slave radio telephone sets

Publications (2)

Publication Number Publication Date
CA2021847A1 true CA2021847A1 (en) 1991-01-29
CA2021847C CA2021847C (en) 1994-01-04

Family

ID=26509399

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002021847A Expired - Fee Related CA2021847C (en) 1989-07-28 1990-07-24 Radiotelephone system

Country Status (3)

Country Link
US (1) US5133002A (en)
KR (1) KR930009846B1 (en)
CA (1) CA2021847C (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5353341A (en) * 1991-10-21 1994-10-04 At&T Bell Laboratories Cordless telephone arranged for operation in a frequency hopping system
US5212808A (en) * 1991-11-08 1993-05-18 Teknekron Communications Systems, Inc. Method and an apparatus for re-establishing wireless communication between a base unit and a remote unit
CA2085722C (en) * 1992-01-08 1997-02-25 Samuel Rocco Paniccia Jr. Use of a vcxo in the base unit of a two-handset cordless telephone system
US5392330A (en) * 1992-01-08 1995-02-21 Thomson Consumer Electronics, Inc. Offset down conversion for a two-handset cordless telephone system
CA2082244C (en) * 1992-01-08 1996-09-03 Samuel Rocco Paniccia Jr. Two-handset cordless telephone system
US5325420A (en) * 1992-09-30 1994-06-28 Fujitsu Limited Cordless phone haaving a plurality of personal stations
AU687996B2 (en) * 1994-02-24 1998-03-05 Gte Wireless Service Corporation Cellular radiotelephone system with remotely programmed mobile stations
FI97933C (en) * 1994-04-20 1997-03-10 Nokia Telecommunications Oy A method for facilitating connection in a cellular radio network and a base station
US5809417A (en) * 1994-07-05 1998-09-15 Lucent Technologies Inc. Cordless telephone arranged for operating with multiple portable units in a frequency hopping system
US5995827A (en) * 1997-11-20 1999-11-30 Lucent Technologies Inc. Method of muting a non-speaking cellular telephone caller participating in a conference call
US6321080B1 (en) * 1999-03-15 2001-11-20 Lucent Technologies, Inc. Conference telephone utilizing base and handset transducers
US7742758B2 (en) * 2005-08-19 2010-06-22 Callpod, Inc. Mobile conferencing and audio sharing technology
US7707250B2 (en) * 2006-05-02 2010-04-27 Callpod, Inc. Wireless communications connection device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310741A (en) * 1965-07-21 1967-03-21 Nederlanden Staat System for alternately transmitting coded messages on a predetermined plurality of carrier frequencies from a plurality of transistors
US4570265A (en) * 1981-11-23 1986-02-11 Motorola, Inc. Random frequency offsetting apparatus for multi-transmitter simulcast radio communications systems
US4558453A (en) * 1981-12-16 1985-12-10 Harris Corporation Synchronization method and frequency hopping communication system
JPS6039968A (en) * 1983-08-12 1985-03-02 Tatsuta Electric Wire & Cable Co Ltd Conference telephone set
JPS60253361A (en) * 1984-05-30 1985-12-14 Fujitsu Ltd Exchange system containing conference call function
JPS61102830A (en) * 1984-10-24 1986-05-21 Touno:Kk Sumultaneous call wireless device
JPS62295527A (en) * 1986-06-14 1987-12-22 Matsushita Electric Works Ltd Cordless interphone set
US4797876A (en) * 1987-07-10 1989-01-10 Solid State Systems, Inc. Conferencing bridge

Also Published As

Publication number Publication date
CA2021847C (en) 1994-01-04
KR930009846B1 (en) 1993-10-12
US5133002A (en) 1992-07-21
KR910004058A (en) 1991-02-28

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed