CA1032221A - Regulateur d'impedance de ligne telephonique - Google Patents
Regulateur d'impedance de ligne telephoniqueInfo
- Publication number
- CA1032221A CA1032221A CA202,503A CA202503A CA1032221A CA 1032221 A CA1032221 A CA 1032221A CA 202503 A CA202503 A CA 202503A CA 1032221 A CA1032221 A CA 1032221A
- Authority
- CA
- Canada
- Prior art keywords
- telephone line
- line impedance
- impedance regulator
- regulator
- 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
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/738—Interface circuits for coupling substations to external telephone lines
- H04M1/76—Compensating for differences in line impedance
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA202,503A CA1032221A (fr) | 1974-06-14 | 1974-06-14 | Regulateur d'impedance de ligne telephonique |
US05/517,375 US3989902A (en) | 1974-06-14 | 1974-10-23 | Alternating current regulator for use with telephone type line |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA202,503A CA1032221A (fr) | 1974-06-14 | 1974-06-14 | Regulateur d'impedance de ligne telephonique |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1032221A true CA1032221A (fr) | 1978-05-30 |
Family
ID=4100388
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA202,503A Expired CA1032221A (fr) | 1974-06-14 | 1974-06-14 | Regulateur d'impedance de ligne telephonique |
Country Status (2)
Country | Link |
---|---|
US (1) | US3989902A (fr) |
CA (1) | CA1032221A (fr) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL174420C (nl) * | 1975-06-30 | 1984-06-01 | Philips Nv | Beveiligingsinrichting voor een telefoontoestel. |
JPS5356903A (en) * | 1976-11-02 | 1978-05-23 | Nippon Telegr & Teleph Corp <Ntt> | Automatic level control circuit for telephone set |
FR2382810A1 (fr) * | 1977-03-02 | 1978-09-29 | Labo Cent Telecommunicat | Circuit d'alimentation de ligne telephonique avec protection |
US4147900A (en) * | 1977-04-07 | 1979-04-03 | Harvey Hubbell Incorporated | Telephone network protective coupler |
GB2057815B (en) * | 1979-08-31 | 1983-08-10 | Standard Telephones Cables Ltd | Electronic telephone circuit |
US4268723A (en) * | 1979-09-04 | 1981-05-19 | Western Electric Company | Circuits and methods for initializing the loop current of a telephone set |
JPS601790B2 (ja) * | 1979-09-14 | 1985-01-17 | 岩崎通信機株式会社 | 押し釦ダイヤル回路 |
NL7907275A (nl) * | 1979-10-01 | 1981-04-03 | Philips Nv | Spanningsstabilisator geschikt voor een telefoon- toestel. |
NL7907276A (nl) * | 1979-10-01 | 1981-04-03 | Philips Nv | Spanningsstabilisator geschikt voor toepassing in een telefoontoestel. |
US4332984A (en) * | 1979-12-13 | 1982-06-01 | Bell Telephone Laboratories, Incorporated | Active speech network circuit for a telephone set |
US4495382A (en) * | 1982-04-23 | 1985-01-22 | Fairchild Camera And Instrument Corporation | Telephone regulator circuitry |
CA2266322C (fr) | 1998-04-03 | 2011-10-25 | Wayne Kwok-Wai Wong | Circuit de protection contre les courants haute intensite pour une interface telephonique |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3035122A (en) * | 1958-09-30 | 1962-05-15 | Gen Dynamics Corp | Constant current line circuitt for loop telephone lines |
GB1047522A (en) * | 1962-05-14 | 1966-11-09 | Post Office | Improvements in or relating to variable impedance electrical circuits |
US3393274A (en) * | 1964-12-18 | 1968-07-16 | American Telephone & Telegraph | Subscriber loop and trunk loop range extension circuit |
US3508009A (en) * | 1967-09-06 | 1970-04-21 | Bell Telephone Labor Inc | Range extension circuit |
JPS5211166B1 (fr) * | 1970-07-23 | 1977-03-29 | ||
CA930488A (en) * | 1971-08-27 | 1973-07-17 | C. J. Cowpland Michael | Power supply |
-
1974
- 1974-06-14 CA CA202,503A patent/CA1032221A/fr not_active Expired
- 1974-10-23 US US05/517,375 patent/US3989902A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US3989902A (en) | 1976-11-02 |
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