GB523066A - Improvements in or relating to carrier telephony systems - Google Patents
Improvements in or relating to carrier telephony systemsInfo
- Publication number
- GB523066A GB523066A GB37461/38A GB3746138A GB523066A GB 523066 A GB523066 A GB 523066A GB 37461/38 A GB37461/38 A GB 37461/38A GB 3746138 A GB3746138 A GB 3746138A GB 523066 A GB523066 A GB 523066A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filter
- carrier
- sections
- dec
- passes
- 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
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/14—Arrangements providing for calling or supervisory signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
523,066. Repeating systems. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. Dec. 23, 1938, No. 37461. Convention date, Dec. 27, 1937. [Class 40 (iv)] [Also in Group XL] In a carrier telephone system in which signals, e.g., dialling signals, are sent by means of the carrier, which is suppressed during speech, the signal currents traverse only a part of the channel filters. As shown, each channel has at the transmitting end a filter section Fl which passes the side-band but not the carrier frequency currents and a filter section F2 which passes both, and the signalling connection is made between these sections. The receiver is. connected between a similar pair of filter sections F4, F3 and includes a filter F5 sharply tuned to the carrier frequency. Fig. 2 shows a preferred form of filter. Preferably the filter sections have a high input impedance looked at from the point at which the signal circuit is connected since this enables the coupling transformer 9 to be replaced by a resistance 11.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE206314X | 1937-12-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB523066A true GB523066A (en) | 1940-07-04 |
Family
ID=5791837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB37461/38A Expired GB523066A (en) | 1937-12-27 | 1938-12-23 | Improvements in or relating to carrier telephony systems |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE431841A (en) |
| CH (1) | CH206314A (en) |
| FR (1) | FR848013A (en) |
| GB (1) | GB523066A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2564378A (en) * | 1946-05-06 | 1951-08-14 | Punch Engineering Pty Ltd | Carrier system signaling circuits |
| US2600226A (en) * | 1947-04-29 | 1952-06-10 | Hartford Nat Bank & Trust Co | Device to minimize interference between dial impulses in a carrier system |
-
1938
- 1938-12-23 GB GB37461/38A patent/GB523066A/en not_active Expired
- 1938-12-24 BE BE431841D patent/BE431841A/xx unknown
- 1938-12-24 CH CH206314D patent/CH206314A/en unknown
- 1938-12-26 FR FR848013D patent/FR848013A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2564378A (en) * | 1946-05-06 | 1951-08-14 | Punch Engineering Pty Ltd | Carrier system signaling circuits |
| US2600226A (en) * | 1947-04-29 | 1952-06-10 | Hartford Nat Bank & Trust Co | Device to minimize interference between dial impulses in a carrier system |
Also Published As
| Publication number | Publication date |
|---|---|
| BE431841A (en) | 1939-01-31 |
| FR848013A (en) | 1939-10-20 |
| CH206314A (en) | 1939-07-31 |
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