FR2433219A1 - NARROW BAND SPEECH TRANSMISSION METHOD AND DEVICE - Google Patents

NARROW BAND SPEECH TRANSMISSION METHOD AND DEVICE

Info

Publication number
FR2433219A1
FR2433219A1 FR7823242A FR7823242A FR2433219A1 FR 2433219 A1 FR2433219 A1 FR 2433219A1 FR 7823242 A FR7823242 A FR 7823242A FR 7823242 A FR7823242 A FR 7823242A FR 2433219 A1 FR2433219 A1 FR 2433219A1
Authority
FR
France
Prior art keywords
transmission method
narrow band
speech transmission
band speech
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.)
Granted
Application number
FR7823242A
Other languages
French (fr)
Other versions
FR2433219B1 (en
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.)
MILLER 3 HERMAN
Original Assignee
MILLER 3 HERMAN
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 MILLER 3 HERMAN filed Critical MILLER 3 HERMAN
Publication of FR2433219A1 publication Critical patent/FR2433219A1/en
Application granted granted Critical
Publication of FR2433219B1 publication Critical patent/FR2433219B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • H04B1/66—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 for reducing bandwidth of signals; for improving efficiency of transmission
    • 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
    • H04B1/66—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 for reducing bandwidth of signals; for improving efficiency of transmission
    • H04B1/667—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 for reducing bandwidth of signals; for improving efficiency of transmission using a division in frequency subbands

Abstract

L'invention concerne la transmission de la parole. Un dispositif de transmission de parole à bande étroite comprend essentiellement un convertisseur il et un convertisseur inverse 26 qui utilisent le fait qu'on peut décomposer le spectre de la parole en deux bandes adjacentes dans lesquelles on ne trouve jamais simultanément des niveaux d'énergie élevés. On peut ainsi transposer l'une des bandes pour la faire coïncider avec l'autre, et réduire de moitié la largeur de bande nécessaire à la transmission. Application aux radiotéléphones.The invention relates to the transmission of speech. A narrowband speech transmission device essentially comprises an II converter and an inverse converter 26 which make use of the fact that the spectrum of speech can be decomposed into two adjacent bands in which high energy levels are never found simultaneously. . It is thus possible to transpose one of the bands to make it coincide with the other, and to reduce by half the bandwidth required for transmission. Application to radiotelephones.

FR7823242A 1978-07-27 1978-08-07 NARROW BAND SPEECH TRANSMISSION METHOD AND DEVICE Granted FR2433219A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA308,278A CA1103587A (en) 1978-07-27 1978-07-27 Narrow band transmission system and method

Publications (2)

Publication Number Publication Date
FR2433219A1 true FR2433219A1 (en) 1980-03-07
FR2433219B1 FR2433219B1 (en) 1984-08-24

Family

ID=4112001

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7823242A Granted FR2433219A1 (en) 1978-07-27 1978-08-07 NARROW BAND SPEECH TRANSMISSION METHOD AND DEVICE

Country Status (4)

Country Link
CA (1) CA1103587A (en)
DE (1) DE2833810A1 (en)
FR (1) FR2433219A1 (en)
GB (1) GB2028064B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1238086A (en) * 1984-08-17 1988-06-14 Joseph P. Mcgeehan Data transmission using a transparent tone-in band system
GB8430319D0 (en) * 1984-11-30 1985-01-09 Mcgeehan J P Transmitters & systems
WO2015165074A1 (en) * 2014-04-30 2015-11-05 Abb Technology Ltd Apparatus and method for filtering noises in signal

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1948973A (en) * 1932-06-10 1934-02-27 Bell Telephone Labor Inc Wave transmission with narrowed band
US3069506A (en) * 1957-09-04 1962-12-18 Ibm Consonant response in narrow band transmission

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1836824A (en) * 1930-10-18 1931-12-15 Bell Telephone Labor Inc Wave transmission with narrowed bands
US2726283A (en) * 1949-12-31 1955-12-06 Itt Method and apparatus for reducing band requirements in transmission systems
DE965910C (en) * 1952-07-27 1957-06-27 Siemens Ag System for transmission of a wide frequency band

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1948973A (en) * 1932-06-10 1934-02-27 Bell Telephone Labor Inc Wave transmission with narrowed band
US3069506A (en) * 1957-09-04 1962-12-18 Ibm Consonant response in narrow band transmission

Also Published As

Publication number Publication date
FR2433219B1 (en) 1984-08-24
DE2833810A1 (en) 1980-02-21
GB2028064A (en) 1980-02-27
GB2028064B (en) 1982-08-18
CA1103587A (en) 1981-06-23

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Legal Events

Date Code Title Description
ST Notification of lapse