GB588825A - Method and means for scrambling spoken messages - Google Patents

Method and means for scrambling spoken messages

Info

Publication number
GB588825A
GB588825A GB9468/44A GB946844A GB588825A GB 588825 A GB588825 A GB 588825A GB 9468/44 A GB9468/44 A GB 9468/44A GB 946844 A GB946844 A GB 946844A GB 588825 A GB588825 A GB 588825A
Authority
GB
United Kingdom
Prior art keywords
bands
sub
referred
constantly
speech
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.)
Expired
Application number
GB9468/44A
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.)
Patelhold Patenverwertungs and Elektro-Holding AG
Original Assignee
Patelhold Patenverwertungs and Elektro-Holding AG
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 Patelhold Patenverwertungs and Elektro-Holding AG filed Critical Patelhold Patenverwertungs and Elektro-Holding AG
Publication of GB588825A publication Critical patent/GB588825A/en
Expired 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Collating Specific Patterns (AREA)
  • Complex Calculations (AREA)

Abstract

588,825. Secret transmission. PATELHOLD PATENTVERWERTUNGS- & ELEKTRO-HOLDING AKT.-GES. May 17, 1944, No. 9468. Convention date, June 23, 1943. Drawings to Specification. [Class 40 (iv)] In a secret transmission system of a kind involving the separation of the original speech into sub-bands, each of such bands is no wider than the mean fundamental frequency of vowel sounds in speech, i.e. from 100 to 200 cycles, and so includes not more than one harmonic of such fundamental. The invention may be applied to the otherwise known scrambling arrangements in which the sub-bands are transposed with or without inversion in accordance with a constantly-changing plan. The initial separation may be into broader bands which undergo an appropriate frequency shift and are then further subdivided. In another system, the respective bands are delayed to different extents. Various combinations of expedients are referred to. In addition, the energy or amplitude of the various bands may be constantly varied. Specifications 552,414 and 570,488 are referred to. The Specification as open to inspection under Sect. 91 includes also a system, Fig. 4 (Cancelled), not shown, in which the sub-bands are continuously varied in width. This subjectmatter does not appear in the Specification as accepted.
GB9468/44A 1943-06-23 1944-05-17 Method and means for scrambling spoken messages Expired GB588825A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH588825X 1943-06-23

Publications (1)

Publication Number Publication Date
GB588825A true GB588825A (en) 1947-06-04

Family

ID=4521995

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9468/44A Expired GB588825A (en) 1943-06-23 1944-05-17 Method and means for scrambling spoken messages

Country Status (4)

Country Link
US (1) US2411683A (en)
CH (1) CH238062A (en)
FR (1) FR904316A (en)
GB (1) GB588825A (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3979558A (en) * 1944-06-30 1976-09-07 Bell Telephone Laboratories, Incorporated Signaling system
CH246844A (en) * 1945-09-15 1947-01-31 Patelhold Patentverwertung Method and device for obfuscating electrically transmitted voice messages.
CH248975A (en) * 1946-02-04 1947-05-31 Patelhold Patentverwertung Process and device for disguising the individual calls in a multi-channel system.
US2923773A (en) * 1953-10-27 1960-02-02 Paul A Wagner Electronic system for handling information
US3024311A (en) * 1957-01-29 1962-03-06 Ampex Signal system
US3517313A (en) * 1964-04-08 1970-06-23 Joseph A Vasile Amplitude elimination and restoration system
US3991271A (en) * 1972-09-29 1976-11-09 Datotek, Inc. Voice security method and system
US4020285A (en) * 1972-09-29 1977-04-26 Datotek, Inc. Voice security method and system
US4195202A (en) * 1978-01-03 1980-03-25 Technical Communications Corporation Voice privacy system with amplitude masking
US4278840A (en) * 1979-03-23 1981-07-14 Datotek, Inc. Dynamic frequency and time voice encryption system and method
US4638357A (en) * 1984-01-20 1987-01-20 Home Box Office, Inc. Audio scrambler
US5101432A (en) * 1986-03-17 1992-03-31 Cardinal Encryption Systems Ltd. Signal encryption
JP2002261736A (en) * 2001-02-27 2002-09-13 Kepusutoramu:Kk Signal scrambling/descrambling method and apparatus and privacy call method using the same
CA2573981A1 (en) 2004-07-15 2006-02-23 Essex Corporation A private and secure optical communication system using an optical tapped delay line

Also Published As

Publication number Publication date
US2411683A (en) 1946-11-26
CH238062A (en) 1945-06-15
FR904316A (en) 1945-11-02

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