GB893474A - Electric communication systems - Google Patents
Electric communication systemsInfo
- Publication number
- GB893474A GB893474A GB831157A GB831157A GB893474A GB 893474 A GB893474 A GB 893474A GB 831157 A GB831157 A GB 831157A GB 831157 A GB831157 A GB 831157A GB 893474 A GB893474 A GB 893474A
- Authority
- GB
- United Kingdom
- Prior art keywords
- subscribers
- phantom
- sources
- meters
- popularity
- 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
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/29—Arrangements for monitoring broadcast services or broadcast-related services
- H04H60/31—Arrangements for monitoring the use made of the broadcast services
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/65—Arrangements characterised by transmission systems for broadcast
- H04H20/76—Wired systems
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Details Of Television Systems (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
893,474. Television distribution systems. COMMUNICATIONS PATENTS Ltd. June 12, 1958 [March 13, 1957], No. 8311/57. Class 40 (4). The variation in impedance of an earth phantom circuit as subscribers to a wired television system switch in is used to obtain a signal indicating the number of subscribers viewing a programme. Programmes from sources A and B are sent over lines 7 and 9 of individual quad cables into which subscribers are connected selectively over switches such as 17 and 18. The audio circuits are not shown. A centre tap is taken from the transmitting transformers 8 and 10 and phantoms are formed whenever subscribers operate mains switches such as 21 which connect a resistor 23 between the cable screens and a centre tap on the subscriber's line transformer. The impedance of the phantom circuit decreases as more subscribers switch into the system and meters 11 and 12, with energizing A.C. sources 13 and 14, give an indication of the number of subscribers viewing each programme. The meters may be recording meters and may be fed from a bridge circuit having the phantom circuit in one arm and having a fixed resistor which when put in place of the phantom is equivalent to all subscribers connected in and gives a calibration (see Fig. 2, not shown). It is mentioned that D.C. sources can be used with the A.C. sources to examine the condition of the phantom so that the popularity of two programmes sent over a single line may be separately monitored. The signals derived from each line of Fig. 1 may be separately amplified while being subject to a gain control derived from the sum of the signals so that their difference after amplification is independent of the number of subscribers viewing and gives a direct indication of relative popularity, Fig. 3, not shown. Signals indicating popularity in remote groups of receivers may control frequency modulators common to each group so that they may be transmitted in different frequency bands over telephone lines to a central station. Specifications 893,475, 893,476 and 893,477 are referred to.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4434561A GB893476A (en) | 1957-03-13 | 1957-03-13 | Broadcast receivers |
| GB4434461A GB893475A (en) | 1957-03-13 | 1957-03-13 | Electric communication systems |
| GB831157A GB893474A (en) | 1957-03-13 | 1957-03-13 | Electric communication systems |
| GB117462A GB893477A (en) | 1957-03-13 | 1958-06-12 | Electric communication systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB831157A GB893474A (en) | 1957-03-13 | 1957-03-13 | Electric communication systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB893474A true GB893474A (en) | 1962-04-11 |
Family
ID=9850089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB831157A Expired GB893474A (en) | 1957-03-13 | 1957-03-13 | Electric communication systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB893474A (en) |
-
1957
- 1957-03-13 GB GB831157A patent/GB893474A/en not_active Expired
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