FR2321219A1 - Voice and data signal discriminator - has power level detector feeding integrator whose output is compared with reference level - Google Patents

Voice and data signal discriminator - has power level detector feeding integrator whose output is compared with reference level

Info

Publication number
FR2321219A1
FR2321219A1 FR7525421A FR7525421A FR2321219A1 FR 2321219 A1 FR2321219 A1 FR 2321219A1 FR 7525421 A FR7525421 A FR 7525421A FR 7525421 A FR7525421 A FR 7525421A FR 2321219 A1 FR2321219 A1 FR 2321219A1
Authority
FR
France
Prior art keywords
voice
reference level
compared
data signal
whose output
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
FR7525421A
Other languages
French (fr)
Other versions
FR2321219B1 (en
Inventor
Jacques Tanguy
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.)
Alcatel CIT SA
Original Assignee
Alcatel CIT SA
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 Alcatel CIT SA filed Critical Alcatel CIT SA
Priority to FR7525421A priority Critical patent/FR2321219A1/en
Publication of FR2321219A1 publication Critical patent/FR2321219A1/en
Application granted granted Critical
Publication of FR2321219B1 publication Critical patent/FR2321219B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other

Abstract

The discriminator circuit is applicable to telephone systems where voice and data signals derived from computer and telegraphic facilities use the same lines. The numeric data should be in either frequency or phase modulated form. Input signals are initially fed into a power level detector (2) providing an approximately DC output proportional to the input power. This is integrated (3) in a circuit having a time constant of about 20 milliseconds. The output from the integrator and a threshold reference level (5) provide the inputs to a comparator (4). The two state output depends on the value of the integrated signal compared to that of the reference level. A bistable circuit (6) acts as memory for the discriminator.
FR7525421A 1975-08-14 1975-08-14 Voice and data signal discriminator - has power level detector feeding integrator whose output is compared with reference level Granted FR2321219A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7525421A FR2321219A1 (en) 1975-08-14 1975-08-14 Voice and data signal discriminator - has power level detector feeding integrator whose output is compared with reference level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7525421A FR2321219A1 (en) 1975-08-14 1975-08-14 Voice and data signal discriminator - has power level detector feeding integrator whose output is compared with reference level

Publications (2)

Publication Number Publication Date
FR2321219A1 true FR2321219A1 (en) 1977-03-11
FR2321219B1 FR2321219B1 (en) 1979-03-30

Family

ID=9159105

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7525421A Granted FR2321219A1 (en) 1975-08-14 1975-08-14 Voice and data signal discriminator - has power level detector feeding integrator whose output is compared with reference level

Country Status (1)

Country Link
FR (1) FR2321219A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0058982A1 (en) * 1981-02-24 1982-09-01 CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. Digital device for discriminating between digitized speech signals and data signals
EP0338654A2 (en) * 1988-04-19 1989-10-25 Control Data Corporation Method and apparatus for controlling communication by a modem over a telephone line
US5073921A (en) * 1987-11-30 1991-12-17 Kabushiki Kaisha Toshiba Line connection switching apparatus for connecting communication line in accordance with matching result of speech pattern
US5267301A (en) * 1988-06-29 1993-11-30 Canon Kabushiki Kaisha Data communication apparatus and method capable of discriminating calling stations
US5333179A (en) * 1988-04-23 1994-07-26 Murata Kikai Kabushiki Kaisha Facsimile apparatus with automatic answering telephone function

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE515686A (en) *

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE515686A (en) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0058982A1 (en) * 1981-02-24 1982-09-01 CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A. Digital device for discriminating between digitized speech signals and data signals
US5073921A (en) * 1987-11-30 1991-12-17 Kabushiki Kaisha Toshiba Line connection switching apparatus for connecting communication line in accordance with matching result of speech pattern
EP0338654A2 (en) * 1988-04-19 1989-10-25 Control Data Corporation Method and apparatus for controlling communication by a modem over a telephone line
EP0338654A3 (en) * 1988-04-19 1990-12-12 Control Data Corporation Method and apparatus for controlling communication by a modem over a telephone line
US5333179A (en) * 1988-04-23 1994-07-26 Murata Kikai Kabushiki Kaisha Facsimile apparatus with automatic answering telephone function
US5267301A (en) * 1988-06-29 1993-11-30 Canon Kabushiki Kaisha Data communication apparatus and method capable of discriminating calling stations

Also Published As

Publication number Publication date
FR2321219B1 (en) 1979-03-30

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Legal Events

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