GB952033A - Improvements in transmission systems and transmitters and receivers therefor - Google Patents
Improvements in transmission systems and transmitters and receivers thereforInfo
- Publication number
- GB952033A GB952033A GB770262A GB770262A GB952033A GB 952033 A GB952033 A GB 952033A GB 770262 A GB770262 A GB 770262A GB 770262 A GB770262 A GB 770262A GB 952033 A GB952033 A GB 952033A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- fed
- output
- auxiliary carrier
- filter
- 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
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/68—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for wholly or partially suppressing the carrier or one side band
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
- H03C1/60—Modulators in which carrier or one sideband is wholly or partially suppressed with one sideband wholly or partially suppressed
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transmitters (AREA)
- Superheterodyne Receivers (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Abstract
952,033. Radio signalling; radio receivers &c. SIEMENS & HALSKE A.G. Feb. 27, 1962 [Feb. 28, 1961], No. 7702/62. Heading H4L. In a transmission system in which a main carrier is modulated by a band of frequencies, an auxiliary carrier which is modulated in a manner representing the frequency difference between the main carrier and auxiliary carrier is transmitted in a frequency band outside that occupied by the sidebands due to the said band of frequencies. At the receiver the auxiliary carrier and its modulation are combined so as to reconstitute the main carrier and the reconstituted main carrier is used for demodulation purposes. At the transmitter, Fig. 2, the auxiliary carrier frequency is generated at 6 and supplied via a phase adjuster 7 to a frequency divider of ratio 1/n=<SP>1</SP>/32. The output of the frequency divider is frequency multiplied by n - 1 at 9 and is also supplied to a frequency divider 11 of ratio <SP>1</SP>/ m =<SP>1</SP>/ 10 . The (n-1)th harmonic is amplified at 12 and fed to a ring modulator 1 which also receives the baseband signal for transmission, and the output is supplied via sideband filter 2 to frequency-changers 4 and 5 providing the required transmitting frequency. The output of oscillator 6 is modulated at 13 with the frequency divided signal <SP>1</SP>/ m and fed to the common output 3. Supervisory signals also may be fed in at 14 to the modulator 13. After frequency-changing at the receiver, Fig. 3, the incoming signal is fed to a terminal 3<SP>1</SP> and a filter 15 selects the auxiliary carrier with its characteristic modulation. After amplification at 16 the auxiliary carrier is fed to a demodulator 18, the supervisory signal being selected at 20 and fed to an output 21 and also used via terminal 22 for gain control. The characteristic modulation is selected at 23 and multiplied by m=10 at 24 and fed to a frequency-changer 27. A narrow band filter 19 supplies the auxiliary carrier frequency via a phase adjuster 26 to the frequencychanger 27 and the difference frequency, which equals the main carrier frequency, is passed via a filter 28 and amplifier 29 to a demodulator 30. The received signal also is supplied via a filter 31 to the demodulator 30 which provides at its output the baseband signal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES72753A DE1127955B (en) | 1961-02-28 | 1961-02-28 | Method and arrangement for transmitting a frequency band preferably also containing low modulation frequencies by means of a carrier frequency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB952033A true GB952033A (en) | 1964-03-11 |
Family
ID=7503446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB770262A Expired GB952033A (en) | 1961-02-28 | 1962-02-27 | Improvements in transmission systems and transmitters and receivers therefor |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS4820923B1 (en) |
| BE (1) | BE614443A (en) |
| CH (1) | CH401165A (en) |
| DE (1) | DE1127955B (en) |
| GB (1) | GB952033A (en) |
| NL (1) | NL275382A (en) |
| SE (1) | SE304040B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2604315A1 (en) * | 1986-09-22 | 1988-03-25 | Stevens John | TELECOMMUNICATION SYSTEMS BY BROADCASTING, IN PARTICULAR FOR THE ELECTRONIC DISPLAY OF PRICES IN A RETAIL STORE |
| EP0348579A1 (en) * | 1988-06-27 | 1990-01-03 | Mostoles Industrial, S.A. | Informative system of characteristics of products in self-service regime selling shops |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1271776B (en) * | 1965-03-23 | 1968-07-04 | Siemens Ag | Carrier frequency system for the transmission of signals according to the double sideband method with suppressed carrier |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1090098A (en) * | 1953-09-23 | 1955-03-28 | Improvements to color television signal transmission systems |
-
0
- NL NL275382D patent/NL275382A/xx unknown
-
1961
- 1961-02-28 DE DES72753A patent/DE1127955B/en active Pending
-
1962
- 1962-01-25 CH CH93362A patent/CH401165A/en unknown
- 1962-02-26 JP JP664862A patent/JPS4820923B1/ja active Pending
- 1962-02-27 SE SE218462A patent/SE304040B/xx unknown
- 1962-02-27 GB GB770262A patent/GB952033A/en not_active Expired
- 1962-02-27 BE BE614443A patent/BE614443A/en unknown
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2604315A1 (en) * | 1986-09-22 | 1988-03-25 | Stevens John | TELECOMMUNICATION SYSTEMS BY BROADCASTING, IN PARTICULAR FOR THE ELECTRONIC DISPLAY OF PRICES IN A RETAIL STORE |
| GB2197564A (en) * | 1986-09-22 | 1988-05-18 | Telepanel Inc | Radio broadcast communication systems |
| GB2197564B (en) * | 1986-09-22 | 1991-03-13 | Telepanel Inc | Improvements in or relating to radio broadcast communication systems |
| EP0348579A1 (en) * | 1988-06-27 | 1990-01-03 | Mostoles Industrial, S.A. | Informative system of characteristics of products in self-service regime selling shops |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS4820923B1 (en) | 1973-06-25 |
| SE304040B (en) | 1968-09-16 |
| CH401165A (en) | 1965-10-31 |
| DE1127955B (en) | 1962-04-19 |
| BE614443A (en) | 1962-06-18 |
| NL275382A (en) |
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