NL171217C - Telefoon - conferentie-versterkerschakeling. - Google Patents
Telefoon - conferentie-versterkerschakeling.Info
- Publication number
- NL171217C NL171217C NLAANVRAGE7209243,A NL7209243A NL171217C NL 171217 C NL171217 C NL 171217C NL 7209243 A NL7209243 A NL 7209243A NL 171217 C NL171217 C NL 171217C
- Authority
- NL
- Netherlands
- Prior art keywords
- telephone
- amplifier circuit
- conference amplifier
- conference
- circuit
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/06—Control of transmission; Equalising by the transmitted signal
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Amplifiers (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3069271A GB1395495A (en) | 1971-06-30 | 1971-06-30 | Telephone conference amplifier |
Publications (3)
Publication Number | Publication Date |
---|---|
NL7209243A NL7209243A (nl) | 1973-01-03 |
NL171217B NL171217B (nl) | 1982-09-16 |
NL171217C true NL171217C (nl) | 1983-02-16 |
Family
ID=10311631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NLAANVRAGE7209243,A NL171217C (nl) | 1971-06-30 | 1972-06-30 | Telefoon - conferentie-versterkerschakeling. |
Country Status (6)
Country | Link |
---|---|
US (1) | US3816917A (nl) |
BE (1) | BE785738A (nl) |
CA (1) | CA965890A (nl) |
FR (1) | FR2144413A5 (nl) |
GB (1) | GB1395495A (nl) |
NL (1) | NL171217C (nl) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3885100A (en) * | 1974-05-31 | 1975-05-20 | Bell Telephone Labor Inc | Six-port conference amplifier circuit |
GB1559839A (en) * | 1975-11-17 | 1980-01-30 | Post Office | Tlephone conference amplifier |
CA1064632A (en) * | 1975-12-17 | 1979-10-16 | Post Office (The) | Switching circuit |
US4086432A (en) * | 1975-12-17 | 1978-04-25 | The Post Office | Switching circuit useful in telephone conference systems |
US4482998A (en) * | 1982-05-27 | 1984-11-13 | At&T Bell Laboratories | Method and apparatus for improving the quality of communication in a digital conference arrangement |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3511931A (en) * | 1966-02-02 | 1970-05-12 | Sylvania Electric Prod | Conferencing networks employing virtual ground summation to obtain isolation |
US3524929A (en) * | 1967-06-29 | 1970-08-18 | Automatic Elect Lab | Telephone conference circuit |
US3579138A (en) * | 1969-08-25 | 1971-05-18 | American Optical Corp | Automatic gain presetting circuit |
-
1971
- 1971-06-30 GB GB3069271A patent/GB1395495A/en not_active Expired
-
1972
- 1972-06-28 US US00267204A patent/US3816917A/en not_active Expired - Lifetime
- 1972-06-29 CA CA146,007A patent/CA965890A/en not_active Expired
- 1972-06-30 BE BE785738A patent/BE785738A/xx not_active IP Right Cessation
- 1972-06-30 FR FR7223797A patent/FR2144413A5/fr not_active Expired
- 1972-06-30 NL NLAANVRAGE7209243,A patent/NL171217C/nl not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
GB1395495A (en) | 1975-05-29 |
BE785738A (fr) | 1972-10-16 |
FR2144413A5 (nl) | 1973-02-09 |
US3816917A (en) | 1974-06-18 |
NL171217B (nl) | 1982-09-16 |
CA965890A (en) | 1975-04-08 |
NL7209243A (nl) | 1973-01-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
BK | Erratum |
Free format text: CORR. TO A PAMPHLET OF A PAT.APPLICATION PUBLISHED |
|
V1 | Lapsed because of non-payment of the annual fee |