CA2074610A1 - Wireless telephone with frequency inversion scrambling - Google Patents

Wireless telephone with frequency inversion scrambling

Info

Publication number
CA2074610A1
CA2074610A1 CA2074610A CA2074610A CA2074610A1 CA 2074610 A1 CA2074610 A1 CA 2074610A1 CA 2074610 A CA2074610 A CA 2074610A CA 2074610 A CA2074610 A CA 2074610A CA 2074610 A1 CA2074610 A1 CA 2074610A1
Authority
CA
Canada
Prior art keywords
base unit
wireless telephone
remote unit
unit
voice signals
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
CA2074610A
Other languages
French (fr)
Other versions
CA2074610C (en
Inventor
Michael W. Houghton
Keith Ronald Manssen
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.)
Motorola Solutions Inc
Original Assignee
Motorola 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 Motorola Inc filed Critical Motorola Inc
Publication of CA2074610A1 publication Critical patent/CA2074610A1/en
Application granted granted Critical
Publication of CA2074610C publication Critical patent/CA2074610C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/04—Secret communication by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band
    • 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

Landscapes

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

Abstract

The wireless telephone of the present invention is com-prised of a base unit, coupled to a land-line telephone system, and a remote unit that communicates with the base unit over radio frequencies. The remote unit has scrambling circuits (207 and 216) for encrypting voice signals transmitted to the base unit and decrypting voice signal received from the base unit. The base unit also has scrambling circuits (107 and 116) for encrypting voice signals transmitted to the remote unit and decrypting voice signals received from the remote unit.
The wireless telephone uses a keypad (222) for initiating a demonstration mode that allows both parties to the conversa-tion to hear the scrambled audio signal.
CA002074610A 1991-09-06 1992-07-24 Wireless telephone with frequency inversion scrambling Expired - Fee Related CA2074610C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US755,982 1985-05-17
US07/755,982 US5140635A (en) 1991-09-06 1991-09-06 Wireless telephone with frequency inversion scrambling

Publications (2)

Publication Number Publication Date
CA2074610A1 true CA2074610A1 (en) 1993-03-07
CA2074610C CA2074610C (en) 1996-07-09

Family

ID=25041515

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002074610A Expired - Fee Related CA2074610C (en) 1991-09-06 1992-07-24 Wireless telephone with frequency inversion scrambling

Country Status (4)

Country Link
US (1) US5140635A (en)
BR (1) BR9203470A (en)
CA (1) CA2074610C (en)
MX (1) MX9205089A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR9203471A (en) * 1991-09-06 1993-04-13 Motorola Inc WIRELESS COMMUNICATIONS SYSTEM, AND PROCESS TO ENABLE DISMANTLING DEMONSTRATION MODE IN COMMUNICATIONS DEVICE
JP3138296B2 (en) * 1991-09-10 2001-02-26 ローム株式会社 Modulation / demodulation circuit and communication system using the same
US5392354A (en) * 1991-10-30 1995-02-21 Fujitsu Limited Cordless phone system capable of scrambling communication signals
US5335279A (en) * 1993-07-30 1994-08-02 Texas Instruments Incorporated Digital voice-band spectrum inversion apparatus
FI101670B (en) * 1995-12-15 1998-07-31 Nokia Mobile Phones Ltd A method for announcing the hiding of data transfer between a mobile station network and a mobile station

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4411017A (en) * 1980-03-14 1983-10-18 Harris Corporation Secure mobile telephone system
US4555805A (en) * 1980-03-14 1985-11-26 Harris Corporation Secure mobile telephone system
US4920567A (en) * 1986-07-03 1990-04-24 Motorola, Inc. Secure telephone terminal
US4827507A (en) * 1987-06-19 1989-05-02 Motorola, Inc. Duplex analog scrambler
US4989230A (en) * 1988-09-23 1991-01-29 Motorola, Inc. Cellular cordless telephone
JP3103850B2 (en) * 1989-03-07 2000-10-30 アイシン精機株式会社 Secret communication control device

Also Published As

Publication number Publication date
CA2074610C (en) 1996-07-09
MX9205089A (en) 1993-03-01
BR9203470A (en) 1993-04-13
US5140635A (en) 1992-08-18

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Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed