GB2139054B - Loudspeaking telephone instruments - Google Patents
Loudspeaking telephone instrumentsInfo
- Publication number
- GB2139054B GB2139054B GB08410334A GB8410334A GB2139054B GB 2139054 B GB2139054 B GB 2139054B GB 08410334 A GB08410334 A GB 08410334A GB 8410334 A GB8410334 A GB 8410334A GB 2139054 B GB2139054 B GB 2139054B
- Authority
- GB
- United Kingdom
- Prior art keywords
- telephone instruments
- loudspeaking telephone
- loudspeaking
- instruments
- telephone
- 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
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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Telephone Function (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08410334A GB2139054B (en) | 1983-04-22 | 1984-04-19 | Loudspeaking telephone instruments |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB838310947A GB8310947D0 (en) | 1983-04-22 | 1983-04-22 | Loudspeaking telephone instruments |
GB08410334A GB2139054B (en) | 1983-04-22 | 1984-04-19 | Loudspeaking telephone instruments |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8410334D0 GB8410334D0 (en) | 1984-05-31 |
GB2139054A GB2139054A (en) | 1984-10-31 |
GB2139054B true GB2139054B (en) | 1986-09-24 |
Family
ID=26285910
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08410334A Expired GB2139054B (en) | 1983-04-22 | 1984-04-19 | Loudspeaking telephone instruments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2139054B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2159375A (en) * | 1984-05-19 | 1985-11-27 | Advance Electronic Prod | Interrupt on priority communication systems |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1030881B (en) * | 1973-12-10 | 1979-04-10 | Cit Alcatel | SEMI SUPPRESSOR OF ECO FOR A TERMINAL OF A FOUR WIRE POWER LINE |
US3942116A (en) * | 1975-03-13 | 1976-03-02 | California Microwave, Inc. | Transceiver having improved voice actuated carrier and echo suppression circuit |
FR2363247A1 (en) * | 1976-08-24 | 1978-03-24 | Cit Alcatel | TERMINAL EQUIPMENT FOR A MULTIPLEX TELEPHONE SYSTEM WITH CARRIER CURRENTS |
FR2380612A1 (en) * | 1977-02-09 | 1978-09-08 | Thomson Csf | SPEECH SIGNAL DISCRIMINATION DEVICE AND ALTERNATION SYSTEM INCLUDING SUCH A DEVICE |
GB2113054A (en) * | 1981-12-21 | 1983-07-27 | Voice Microsystems Ltd | Speech detector |
-
1984
- 1984-04-19 GB GB08410334A patent/GB2139054B/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB8410334D0 (en) | 1984-05-31 |
GB2139054A (en) | 1984-10-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |