CA1040332A - System for control of speech direction in duplex telephone circuits - Google Patents
System for control of speech direction in duplex telephone circuitsInfo
- Publication number
- CA1040332A CA1040332A CA238,075A CA238075A CA1040332A CA 1040332 A CA1040332 A CA 1040332A CA 238075 A CA238075 A CA 238075A CA 1040332 A CA1040332 A CA 1040332A
- Authority
- CA
- Canada
- Prior art keywords
- signal
- channel
- value
- speech
- regulating
- 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
Links
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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
- H04M9/085—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using digital techniques
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/001—Two-way communication systems between a limited number of parties
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO743893A NO134477C (en, 2012) | 1974-10-29 | 1974-10-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1040332A true CA1040332A (en) | 1978-10-10 |
Family
ID=19881909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA238,075A Expired CA1040332A (en) | 1974-10-29 | 1975-10-21 | System for control of speech direction in duplex telephone circuits |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US4052562A (en, 2012) |
| JP (2) | JPS5167008A (en, 2012) |
| AT (1) | AT358634B (en, 2012) |
| BE (1) | BE835013A (en, 2012) |
| CA (1) | CA1040332A (en, 2012) |
| CH (1) | CH600711A5 (en, 2012) |
| DE (1) | DE2546926C3 (en, 2012) |
| DK (1) | DK152637C (en, 2012) |
| FR (1) | FR2290108A1 (en, 2012) |
| GB (1) | GB1507866A (en, 2012) |
| IT (1) | IT1044596B (en, 2012) |
| NL (1) | NL7512677A (en, 2012) |
| NO (1) | NO134477C (en, 2012) |
| SE (1) | SE400443B (en, 2012) |
| ZA (1) | ZA756825B (en, 2012) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2638286C3 (de) * | 1976-08-25 | 1979-03-01 | Dasy Inter S.A., Genf (Schweiz) | Schaltungsanordnung für ein Freisprechertelefon |
| US4215252A (en) * | 1978-09-27 | 1980-07-29 | Communications Satellite Corporation | Video teleconference audio echo control unit |
| DE2952122A1 (de) * | 1979-12-22 | 1981-06-25 | Deutsche Itt Industries Gmbh, 7800 Freiburg | Schaltungsanordnung fuer sprachgesteuerte freisprechgeraete |
| DE3007632A1 (de) * | 1980-02-29 | 1981-09-10 | Deutsche Itt Industries Gmbh, 7800 Freiburg | Schaltungsanordnung zur rueckkopplungsverhinderung bei telefonapparaten mit freisprech- und/oder mithoermoeglichkeit |
| JPS5797262A (en) * | 1980-12-09 | 1982-06-16 | Nippon Telegr & Teleph Corp <Ntt> | Loud speaker telephone set system |
| US4378603A (en) * | 1980-12-23 | 1983-03-29 | Motorola, Inc. | Radiotelephone with hands-free operation |
| US4400584A (en) * | 1982-04-05 | 1983-08-23 | Motorola, Inc. | Speakerphone for radio and, landline telephones |
| GB2122851B (en) * | 1982-06-10 | 1986-03-19 | Standard Telephones Cables Ltd | Loudspeaking telephones |
| JPS5916434A (ja) * | 1982-07-19 | 1984-01-27 | Hitachi Ltd | 光通信方式 |
| GB2137454A (en) * | 1983-03-01 | 1984-10-03 | Standard Telephones Cables Ltd | Handsfree telephone system |
| GB2137049B (en) * | 1983-03-15 | 1986-05-14 | Standard Telephones Cables Ltd | Handsfree telephone |
| US4542263A (en) * | 1984-03-07 | 1985-09-17 | Oki Electric Industry Co., Ltd. | Speech control circuit |
| US4860359A (en) * | 1984-10-15 | 1989-08-22 | Rockwell International Corporation | Method of voice operated transmit control |
| CA1226981A (en) * | 1984-10-30 | 1987-09-15 | Novatel Communications Ltd. | Two way telephone communication system |
| FI78373C (fi) * | 1988-01-18 | 1989-07-10 | Sostel Oy | Telefontrafik- eller dataoeverfoeringssystem. |
| DE59008583D1 (de) * | 1989-10-18 | 1995-04-06 | Siemens Ag | Verfahren zur automatischen Sprachrichtungsumschaltung und Schaltungsanordnung zur Durchführung des Verfahrens. |
| US7072476B2 (en) * | 1997-02-18 | 2006-07-04 | Matech, Inc. | Audio headset |
| US5907538A (en) * | 1997-02-18 | 1999-05-25 | White; Donald R. | Full duplex communication circuit with a transducer for simultaneously generating audio output and receiving audio input |
| WO2005048574A1 (en) * | 2003-11-11 | 2005-05-26 | Matech, Inc. | Automatic-switching wireless communication device |
| US7881483B2 (en) * | 2003-11-11 | 2011-02-01 | Matech, Inc. | Two-way communications device having a single transducer |
| JP2006108777A (ja) * | 2004-09-30 | 2006-04-20 | Toshiba Corp | 電話端末及びこの電話端末を使用した電話システム、及び電話端末の制御方法 |
| US8315379B2 (en) * | 2004-11-10 | 2012-11-20 | Matech, Inc. | Single transducer full duplex talking circuit |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL225471A (en, 2012) * | 1957-11-26 | 1900-01-01 | ||
| NL267461A (en, 2012) * | 1960-10-04 | 1900-01-01 | ||
| DE1562130A1 (de) * | 1968-01-12 | 1970-10-29 | Lauffer Dr Ing Hans | Wechselsprechanlage |
| BE786256A (fr) * | 1971-07-15 | 1973-01-15 | Philips Nv | Dispositif de commutation commande par des signaux |
| FR2157143A5 (en, 2012) * | 1971-10-19 | 1973-06-01 | Queffeulou Jean Yves | |
| NL155700B (nl) * | 1971-12-08 | 1978-01-16 | Philips Nv | Luidsprekende telefooninrichting. |
| US3725585A (en) * | 1972-03-21 | 1973-04-03 | Itt | Loudspeaking telephone station circuit |
| SE354557B (en, 2012) * | 1972-03-22 | 1973-03-12 | Ericsson Telefon Ab L M | |
| US3832491A (en) * | 1973-02-13 | 1974-08-27 | Communications Satellite Corp | Digital voice switch with an adaptive digitally-controlled threshold |
| FR2224961B1 (en, 2012) * | 1973-04-06 | 1977-04-29 | Voyer Paul |
-
1974
- 1974-10-29 NO NO743893A patent/NO134477C/no unknown
-
1975
- 1975-10-16 CH CH1342975A patent/CH600711A5/xx not_active IP Right Cessation
- 1975-10-20 US US05/624,250 patent/US4052562A/en not_active Expired - Lifetime
- 1975-10-20 DE DE2546926A patent/DE2546926C3/de not_active Expired
- 1975-10-21 CA CA238,075A patent/CA1040332A/en not_active Expired
- 1975-10-23 AT AT808375A patent/AT358634B/de not_active IP Right Cessation
- 1975-10-28 SE SE7512043A patent/SE400443B/xx not_active IP Right Cessation
- 1975-10-28 FR FR7532958A patent/FR2290108A1/fr active Granted
- 1975-10-28 GB GB44473/75A patent/GB1507866A/en not_active Expired
- 1975-10-28 DK DK483775A patent/DK152637C/da not_active IP Right Cessation
- 1975-10-28 JP JP50129760A patent/JPS5167008A/ja active Pending
- 1975-10-29 IT IT28779/75A patent/IT1044596B/it active
- 1975-10-29 NL NL7512677A patent/NL7512677A/xx not_active Application Discontinuation
- 1975-10-29 ZA ZA00756825A patent/ZA756825B/xx unknown
- 1975-10-29 BE BE161378A patent/BE835013A/xx not_active IP Right Cessation
-
1983
- 1983-04-25 JP JP1983062014U patent/JPS5952767U/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| ATA808375A (de) | 1980-02-15 |
| IT1044596B (it) | 1980-03-31 |
| JPS5167008A (en, 2012) | 1976-06-10 |
| NL7512677A (nl) | 1976-05-04 |
| DE2546926C3 (de) | 1980-12-18 |
| FR2290108B1 (en, 2012) | 1979-06-15 |
| JPS6244610Y2 (en, 2012) | 1987-11-26 |
| ZA756825B (en) | 1976-10-27 |
| FR2290108A1 (fr) | 1976-05-28 |
| BE835013A (fr) | 1976-02-16 |
| NO743893L (en, 2012) | 1976-04-30 |
| GB1507866A (en) | 1978-04-19 |
| DK152637C (da) | 1988-08-15 |
| SE400443B (sv) | 1978-03-20 |
| DK483775A (da) | 1976-04-30 |
| NO134477B (en, 2012) | 1976-07-05 |
| SE7512043L (sv) | 1976-04-30 |
| US4052562A (en) | 1977-10-04 |
| CH600711A5 (en, 2012) | 1978-06-30 |
| JPS5952767U (ja) | 1984-04-06 |
| DK152637B (da) | 1988-03-28 |
| DE2546926A1 (de) | 1976-05-06 |
| AT358634B (de) | 1980-09-25 |
| DE2546926B2 (de) | 1980-04-24 |
| AU8602675A (en) | 1977-05-05 |
| NO134477C (en, 2012) | 1976-10-13 |
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