CA2085721A1 - Conversion par abaissement de frequence a decalage pour systeme telephonique sans fil a deux combines - Google Patents

Conversion par abaissement de frequence a decalage pour systeme telephonique sans fil a deux combines

Info

Publication number
CA2085721A1
CA2085721A1 CA2085721A CA2085721A CA2085721A1 CA 2085721 A1 CA2085721 A1 CA 2085721A1 CA 2085721 A CA2085721 A CA 2085721A CA 2085721 A CA2085721 A CA 2085721A CA 2085721 A1 CA2085721 A1 CA 2085721A1
Authority
CA
Canada
Prior art keywords
cordless telephone
telephone system
base unit
down conversion
offset down
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
CA2085721A
Other languages
English (en)
Other versions
CA2085721C (fr
Inventor
Samuel Rocco Paniccia, Jr.
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.)
Technicolor USA Inc
Original Assignee
Thomson Consumer Electronics Inc
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
Application filed by Thomson Consumer Electronics Inc filed Critical Thomson Consumer Electronics Inc
Publication of CA2085721A1 publication Critical patent/CA2085721A1/fr
Application granted granted Critical
Publication of CA2085721C publication Critical patent/CA2085721C/fr
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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/26—Circuits for superheterodyne receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transceivers (AREA)
  • Telephone Set Structure (AREA)

Abstract

Système de téléphone sans cordon, comprenant une unité de base simple et au moins deux unités à main éloignées. Avec un tel système, deux utilisateurs peuvent participer à une conversation à trois tout en restant libres de circuler dans un rayon de transmission raisonnable autour de l'unité de base. L'unité de base comprend au moins deux voies de traitement de fréquence intermédiaire produite par double conversion. Les parties liées à la première conversion de fréquence à l'intérieur des deux voies sont décalées en fréquence par rapport à une valeur nominale d'une quantité essentiellement identique dans les directions opposées.
CA002085721A 1992-01-08 1992-12-17 Conversion par abaissement de frequence a decalage pour systeme telephonique sans fil a deux combines Expired - Fee Related CA2085721C (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US817,932 1992-01-08
US07/817,932 US5392330A (en) 1992-01-08 1992-01-08 Offset down conversion for a two-handset cordless telephone system

Publications (2)

Publication Number Publication Date
CA2085721A1 true CA2085721A1 (fr) 1993-07-09
CA2085721C CA2085721C (fr) 1997-07-15

Family

ID=25224237

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002085721A Expired - Fee Related CA2085721C (fr) 1992-01-08 1992-12-17 Conversion par abaissement de frequence a decalage pour systeme telephonique sans fil a deux combines

Country Status (9)

Country Link
US (1) US5392330A (fr)
EP (1) EP0553497B1 (fr)
JP (1) JPH05268148A (fr)
KR (1) KR960012983B1 (fr)
CN (1) CN1027208C (fr)
CA (1) CA2085721C (fr)
DE (1) DE69221461T2 (fr)
MX (1) MX9300047A (fr)
MY (1) MY130017A (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5826180A (en) * 1994-08-08 1998-10-20 Nice Systems Ltd. Near homodyne radio frequency receiver
US6044268A (en) * 1997-07-16 2000-03-28 Telefonaktiebolaget Lm Ericsson Ab System and method for providing intercom and multiple voice channels in a private telephone system
US20020049036A1 (en) * 1999-10-13 2002-04-25 Scott R. Bullock Wireless phone/data jack using 49 mhz rf technology
US8292931B2 (en) * 2004-04-23 2012-10-23 Leonard Edward Forrest Method and device for placing materials in the spine
JP5001833B2 (ja) * 2004-04-23 2012-08-15 フォレスト，レナード・エドワード 椎間板の治療又は除去のための装置及び方法
US8257311B2 (en) * 2004-04-23 2012-09-04 Leonard Edward Forrest Method and device for treatment of the spine
WO2006104887A2 (fr) * 2005-03-25 2006-10-05 Schulein Robert B Systeme de communication de donnees et de donnees audio

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1022275B (de) * 1953-11-14 1958-01-09 Siemens Elektrogeraete Gmbh Verfahren und Einrichtung zum Empfang von ueber getrennte modulierte Traegerwellen stereophonisch uebertragenen Schallsendungen
DE2149514A1 (de) * 1971-10-04 1973-04-12 Siemens Ag Schaltungsanordnung zum gleichzeitigen und ungestoerten empfang mehrerer sender mit einem einzigen empfaenger
US4476575A (en) * 1982-12-13 1984-10-09 General Electric Company Radio transceiver
JPS61274528A (ja) * 1985-05-30 1986-12-04 Nec Corp コ−ドレス電話システム
JPH0815354B2 (ja) * 1986-10-30 1996-02-14 日本電気株式会社 無線電話装置
US4759078A (en) * 1986-11-14 1988-07-19 Rose Communication Systems, Inc. Coordinated local oscillator receiving system
JPH0744485B2 (ja) * 1987-05-22 1995-05-15 三菱電機株式会社 自動車電話装置
GB2209109A (en) * 1987-08-26 1989-04-26 Philips Nv Pabx cordless telephone system
JPH02291732A (ja) * 1989-05-01 1990-12-03 Iwatsu Electric Co Ltd 移動通信系における分散受信方式
US5133002A (en) * 1989-07-28 1992-07-21 Ascii Corporation Radiotelephone system that maintains synchronization between base and subordinate units while shifting carrier frequencies
JPH0831907B2 (ja) * 1989-07-28 1996-03-27 株式会社アスキー 無線親子電話
JP2510021B2 (ja) * 1990-03-07 1996-06-26 シャープ株式会社 コ―ドレス電話機
JPH03293824A (ja) * 1990-04-12 1991-12-25 Pioneer Electron Corp ラジオ受信機
JPH047923A (ja) * 1990-04-25 1992-01-13 Sharp Corp コードレス電話機

Also Published As

Publication number Publication date
JPH05268148A (ja) 1993-10-15
MY130017A (en) 2007-05-31
MX9300047A (es) 1993-07-01
CN1027208C (zh) 1994-12-28
KR930017357A (ko) 1993-08-30
CA2085721C (fr) 1997-07-15
US5392330A (en) 1995-02-21
KR960012983B1 (ko) 1996-09-25
EP0553497A3 (en) 1993-08-18
DE69221461D1 (de) 1997-09-11
CN1075036A (zh) 1993-08-04
EP0553497B1 (fr) 1997-08-06
DE69221461T2 (de) 1998-01-29
EP0553497A2 (fr) 1993-08-04

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed
MKLA Lapsed

Effective date: 19991217