GB1328001A - Frequency multiplex telecommunications systems - Google Patents
Frequency multiplex telecommunications systemsInfo
- Publication number
- GB1328001A GB1328001A GB2028271A GB2028271A GB1328001A GB 1328001 A GB1328001 A GB 1328001A GB 2028271 A GB2028271 A GB 2028271A GB 2028271 A GB2028271 A GB 2028271A GB 1328001 A GB1328001 A GB 1328001A
- Authority
- GB
- United Kingdom
- Prior art keywords
- video
- khz
- tertiary
- mhz
- vestigial sideband
- 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
- H04J1/04—Frequency-transposition arrangements
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Television Systems (AREA)
Abstract
1328001 Carrier multiplex systems SIEMENS AG 19 April 1971 [29 Jan 1970 (2)] 20282/71 Heading H4R In an arrangement for transmitting "video" signals over a carrier link the video signals are transmitted as a vestigial sideband signal in a band which would otherwise carry a tertiary group of 300 telephony channels. As described the original video band extending up to about 992 KHz is transposed, either in one Fig. 3 or 4 (not shown), or two, Fig. 2, modulation steps to the frequency band 812-2044, either erect (Fig. 3) or inverted (Fig. 4) with the vestigial sideband characteristic provided after the first modulation step. From this basic teritary group position the video signal can be transposed to occupy tertiary group positions in 4 MHz or 12 MHz systems in the same way as normal tertiary groups of 300 telephone channels. Alternatively, Fig. 1, the video signal can be modulated and filtered to provide an inverted vestigial sideband transmission ZF at 2916 to 4148 KHz which is used directly as the third tertiary group in a 4 MHz system with the first and second tertiary groups derived from similar intermediate signals ZF of video or telephony channels by a further modulation stage. Preferably the first transposition from video uses a carrier which is an odd number multiple of 4 KHz and derived independently from a crystal oscillator so as to have a stability of Œ 4 Hz while the remaining carriers are all whole number multiples of 8 KHz. The choice of carriers for the system is the subject of Specification 1,328,002.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19702004018 DE2004018C (en) | 1970-01-29 | Frequency division multiplex system for transmission of telephone and videophone channels |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1328001A true GB1328001A (en) | 1973-08-22 |
Family
ID=5760843
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2028271A Expired GB1328001A (en) | 1970-01-29 | 1971-04-19 | Frequency multiplex telecommunications systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1328001A (en) |
-
1971
- 1971-04-19 GB GB2028271A patent/GB1328001A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE2004018B2 (en) | 1971-08-15 |
DE2004018A1 (en) | 1971-08-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |