GB2021355B - Hands-free facility - Google Patents
Hands-free facilityInfo
- Publication number
- GB2021355B GB2021355B GB7911901A GB7911901A GB2021355B GB 2021355 B GB2021355 B GB 2021355B GB 7911901 A GB7911901 A GB 7911901A GB 7911901 A GB7911901 A GB 7911901A GB 2021355 B GB2021355 B GB 2021355B
- Authority
- GB
- United Kingdom
- Prior art keywords
- hands
- free facility
- facility
- free
- 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
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/68—Circuit arrangements for preventing eavesdropping
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Function (AREA)
- Emergency Alarm Devices (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19782822069 DE2822069C2 (en) | 1978-05-20 | 1978-05-20 | Circuit arrangement for protection against eavesdropping in voice-controlled hands-free devices, in particular in telephone sets |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2021355A GB2021355A (en) | 1979-11-28 |
GB2021355B true GB2021355B (en) | 1982-06-03 |
Family
ID=6039819
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7911901A Expired GB2021355B (en) | 1978-05-20 | 1979-04-05 | Hands-free facility |
Country Status (4)
Country | Link |
---|---|
BR (1) | BR7902952A (en) |
DE (1) | DE2822069C2 (en) |
GB (1) | GB2021355B (en) |
IE (1) | IE48335B1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1181541A (en) * | 1982-05-21 | 1985-01-22 | Mitel Corporation | Loudspeaking telephone |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE339704B (en) * | 1970-12-22 | 1971-10-18 | Ericsson Telefon Ab L M |
-
1978
- 1978-05-20 DE DE19782822069 patent/DE2822069C2/en not_active Expired
-
1979
- 1979-04-05 GB GB7911901A patent/GB2021355B/en not_active Expired
- 1979-05-14 BR BR7902952A patent/BR7902952A/en unknown
- 1979-08-08 IE IE97379A patent/IE48335B1/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE2822069C2 (en) | 1986-02-20 |
DE2822069A1 (en) | 1979-11-22 |
IE48335B1 (en) | 1984-12-12 |
GB2021355A (en) | 1979-11-28 |
IE790973L (en) | 1979-11-20 |
BR7902952A (en) | 1979-11-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |