FR2376576A1 - Perfectionnements aux postes telephoniques a mains libres - Google Patents
Perfectionnements aux postes telephoniques a mains libresInfo
- Publication number
- FR2376576A1 FR2376576A1 FR7639791A FR7639791A FR2376576A1 FR 2376576 A1 FR2376576 A1 FR 2376576A1 FR 7639791 A FR7639791 A FR 7639791A FR 7639791 A FR7639791 A FR 7639791A FR 2376576 A1 FR2376576 A1 FR 2376576A1
- Authority
- FR
- France
- Prior art keywords
- speech
- listening
- signals
- attenuator
- hands
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Transmitters (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Amplifiers (AREA)
- Telephone Function (AREA)
Abstract
a. Poste téléphonique à haut-parleur. b. Il comprend sur la voie de parole un affaiblisseur et un amplificateur des signaux de parole commandés par tension et sur la voie d'écoute un affaiblisseur des signaux d'écoute commandé par tension, des moyens de prélever les signaux de parole et d'écoute respectivement à la sortie des affaiblisseurs de parole et d'écoute et de les détecter et des moyens de commander le gain de l'amplificateur de parole par les signaux de parole détectés, et il est caratérisé en ce qu'il comprend des moyens de faire la somme des signaux de parole et d'écoute détectés et de commander en sens inverse, par ladite somme de signaux, l'affaiblisseur de parole et l'affaiblisseur d'écoute. c. Postes téléphoniques << mains libres >>.
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7639791A FR2376576A1 (fr) | 1976-12-31 | 1976-12-31 | Perfectionnements aux postes telephoniques a mains libres |
JP15750577A JPS5375709A (en) | 1976-12-31 | 1977-12-28 | Handdfree telephone set |
PT67464A PT67464B (fr) | 1976-12-31 | 1977-12-28 | Perfectionnements aux postes telephoniques |
US05/865,692 US4162374A (en) | 1976-12-31 | 1977-12-29 | Voice-switched telephone set |
ZA00777704A ZA777704B (en) | 1976-12-31 | 1977-12-29 | Improvements in telephone equipment |
DE2758573A DE2758573C3 (de) | 1976-12-31 | 1977-12-29 | Telefonsprechstelle mit Lautsprecher |
GB54321/77A GB1560330A (en) | 1976-12-31 | 1977-12-30 | A telephone circuit |
ES465658A ES465658A1 (es) | 1976-12-31 | 1977-12-31 | Mejoras introducidas en los aparatos telefonicos provistos de altavoz. |
BR7800019A BR7800019A (pt) | 1976-12-31 | 1978-01-02 | Aperfeicoamentos em postos telefonicos a maos-livres |
CA294,265A CA1101142A (fr) | 1976-12-31 | 1978-01-03 | Poste telephonique a commutation par la voix |
IE13/78A IE46131B1 (en) | 1976-12-31 | 1978-01-03 | Telephone circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7639791A FR2376576A1 (fr) | 1976-12-31 | 1976-12-31 | Perfectionnements aux postes telephoniques a mains libres |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2376576A1 true FR2376576A1 (fr) | 1978-07-28 |
FR2376576B1 FR2376576B1 (fr) | 1981-11-27 |
Family
ID=9181836
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7639791A Granted FR2376576A1 (fr) | 1976-12-31 | 1976-12-31 | Perfectionnements aux postes telephoniques a mains libres |
Country Status (11)
Country | Link |
---|---|
US (1) | US4162374A (fr) |
JP (1) | JPS5375709A (fr) |
BR (1) | BR7800019A (fr) |
CA (1) | CA1101142A (fr) |
DE (1) | DE2758573C3 (fr) |
ES (1) | ES465658A1 (fr) |
FR (1) | FR2376576A1 (fr) |
GB (1) | GB1560330A (fr) |
IE (1) | IE46131B1 (fr) |
PT (1) | PT67464B (fr) |
ZA (1) | ZA777704B (fr) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD154419A1 (de) * | 1980-12-23 | 1982-03-17 | Helmut Kammholz | Schaltungsanordnung fuer einen fernsprechapparat mit mithoer-und freisprecheinrichtung |
DE3218501A1 (de) * | 1981-12-05 | 1983-11-17 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Schaltungsanordnung zur gegensinnigen verstaerkungssteuerung |
DE3148202A1 (de) * | 1981-12-05 | 1983-06-09 | Licentia Patent-Verwaltungs-GmbH, 60325 Frankfurt | "schaltungsanordnung zur gegensinnigen verstaerkungssteuerung von verstaerkern" |
DE3213968C2 (de) * | 1982-04-16 | 1984-06-14 | Deutsche Fernsprecher Gesellschaft Mbh Marburg, 3550 Marburg | Fernsprechapparat |
DE3616314A1 (de) * | 1986-05-13 | 1987-11-19 | Krone Ag | Fernsprechapparat mit freisprecheinrichtung |
US5058155A (en) * | 1989-12-01 | 1991-10-15 | Gn Netcom A/S | Multipurpose headset amplifier |
US20070041606A1 (en) * | 2005-08-22 | 2007-02-22 | David Clark Company Incorporated | Apparatus and method for noise cancellation in communication headset using dual-coil speaker |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL245570A (fr) * | 1958-12-29 | |||
FR2102614A5 (fr) * | 1970-08-06 | 1972-04-07 | Barok Albert | |
US4049911A (en) * | 1976-01-06 | 1977-09-20 | Norcon Electronics Inc. | Talk-through unit with voice controlled switching with turn off delay variable from 250-500 milliseconds depending on voice amplitude |
-
1976
- 1976-12-31 FR FR7639791A patent/FR2376576A1/fr active Granted
-
1977
- 1977-12-28 PT PT67464A patent/PT67464B/fr unknown
- 1977-12-28 JP JP15750577A patent/JPS5375709A/ja active Pending
- 1977-12-29 DE DE2758573A patent/DE2758573C3/de not_active Expired
- 1977-12-29 US US05/865,692 patent/US4162374A/en not_active Expired - Lifetime
- 1977-12-29 ZA ZA00777704A patent/ZA777704B/xx unknown
- 1977-12-30 GB GB54321/77A patent/GB1560330A/en not_active Expired
- 1977-12-31 ES ES465658A patent/ES465658A1/es not_active Expired
-
1978
- 1978-01-02 BR BR7800019A patent/BR7800019A/pt unknown
- 1978-01-03 CA CA294,265A patent/CA1101142A/fr not_active Expired
- 1978-01-03 IE IE13/78A patent/IE46131B1/en unknown
Also Published As
Publication number | Publication date |
---|---|
US4162374A (en) | 1979-07-24 |
FR2376576B1 (fr) | 1981-11-27 |
DE2758573B2 (de) | 1980-02-14 |
JPS5375709A (en) | 1978-07-05 |
IE46131B1 (en) | 1983-03-09 |
ES465658A1 (es) | 1978-10-01 |
GB1560330A (en) | 1980-02-06 |
BR7800019A (pt) | 1978-10-24 |
CA1101142A (fr) | 1981-05-12 |
IE780013L (en) | 1978-06-30 |
PT67464A (fr) | 1978-01-01 |
PT67464B (fr) | 1979-05-25 |
ZA777704B (en) | 1978-10-25 |
DE2758573C3 (de) | 1980-10-09 |
DE2758573A1 (de) | 1978-07-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |