GB1048064A - Improvements in or relating to frequency modulated or shifted telegraph and like receivers - Google Patents
Improvements in or relating to frequency modulated or shifted telegraph and like receiversInfo
- Publication number
- GB1048064A GB1048064A GB2257565A GB2257565A GB1048064A GB 1048064 A GB1048064 A GB 1048064A GB 2257565 A GB2257565 A GB 2257565A GB 2257565 A GB2257565 A GB 2257565A GB 1048064 A GB1048064 A GB 1048064A
- Authority
- GB
- United Kingdom
- Prior art keywords
- telegraph
- degrees
- signals
- mixers
- pass
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
- H04L27/144—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
- H04L27/152—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements
- H04L27/1525—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements using quadrature demodulation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Superheterodyne Receivers (AREA)
Abstract
1,048,064. Telegraphy. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. May 27, 1965 [May 29, 1964], No. 22575/65. Heading H4P. A receiver for frequency shift telegraph signals comprises an oscillator providing a signal of frequency equal to the mean of the shift frequencies, which signal is fed to two mixers, one via a 90 degrees phase shifter. The received telegraph signals pass to the mixers, the mixer outputs having a relative phase of Œ90 degrees dependent upon the frequency received. From these outputs is derived the D.C. telegraph signal. In a first embodiment, the mixer outputs pass to phase shifters which produce signals having a relative phase of 0 degrees or 180 degrees which pass to a phase detector to provide double current signals. In a second embodiment the mixers feed a gating and delay arrangement which provides pulses to operate a toggle giving the double current signals.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DET26273A DE1190495B (en) | 1964-05-29 | 1964-05-29 | Circuit arrangement for demodulating frequency-shift keyed telegraphy messages |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1048064A true GB1048064A (en) | 1966-11-09 |
Family
ID=7552656
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2257565A Expired GB1048064A (en) | 1964-05-29 | 1965-05-27 | Improvements in or relating to frequency modulated or shifted telegraph and like receivers |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1190495B (en) |
GB (1) | GB1048064A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2431226A1 (en) * | 1978-07-11 | 1980-02-08 | Int Standard Electric Corp | Radio receiver for fsk signals - has local oscillator with output fed to D=flip=flop via two mixers and two limiting amplifier stages (DK 4.2.80) |
FR2440124A1 (en) * | 1978-10-24 | 1980-05-23 | Int Standard Electric Corp | RADIO RECEIVER FOR SOUND FREQUENCY MODULES |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2143386B (en) * | 1983-07-14 | 1987-01-14 | Standard Telephones Cables Ltd | Radio receiver |
CH667170A5 (en) * | 1984-12-07 | 1988-09-15 | Industrieorientierte Forsch | METHOD FOR DETECTING THE INFORMATION OF A RECEIVE SIGNAL, IN PARTICULAR WITH FREQUENCY REVERSE. |
-
1964
- 1964-05-29 DE DET26273A patent/DE1190495B/en active Pending
-
1965
- 1965-05-27 GB GB2257565A patent/GB1048064A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2431226A1 (en) * | 1978-07-11 | 1980-02-08 | Int Standard Electric Corp | Radio receiver for fsk signals - has local oscillator with output fed to D=flip=flop via two mixers and two limiting amplifier stages (DK 4.2.80) |
FR2440124A1 (en) * | 1978-10-24 | 1980-05-23 | Int Standard Electric Corp | RADIO RECEIVER FOR SOUND FREQUENCY MODULES |
Also Published As
Publication number | Publication date |
---|---|
DE1190495B (en) | 1965-04-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
SE9102317D0 (en) | MIXERS FOR DIRECT CONVERSION RECEIVERS | |
GB724555A (en) | Improvements in and relating to continuous wave radar systems | |
ES386198A1 (en) | Radio receiver for single sideband reception | |
GB973418A (en) | Diversity receiving system | |
US2424796A (en) | Superheterodyne radio altimeter or locator | |
US3188637A (en) | Fm pulsed radar with intrapulse range discrimination | |
GB1048064A (en) | Improvements in or relating to frequency modulated or shifted telegraph and like receivers | |
GB1059393A (en) | Improvements in or relating to demodulators for frequency modulated waves | |
US2658195A (en) | Moving target indicating radar system | |
GB1082735A (en) | Fm demodulator system | |
GB1026387A (en) | A radio system using spaced pulses for intelligence transmission | |
CA2161846A1 (en) | Television receiver | |
GB1303510A (en) | ||
SE8103035L (en) | RADIORECEIVER | |
GB1091830A (en) | Improvements in or relating to colour television equipment | |
GB655773A (en) | Means for receiving electric wave communication signals | |
SE338350B (en) | ||
GB1096452A (en) | Electric signal transmission system | |
GB955281A (en) | Improvements in or relating to radio navigation systems | |
GB1120545A (en) | Method of transmitting and receiving a short wave communications signal | |
US3502989A (en) | Receiver employing correlation techniques | |
GB845847A (en) | Radio diversity receiving system | |
GB802008A (en) | Improvements in or relating to frequency stabilisation of continuous wave radar systems | |
GB1287375A (en) | A device for transmission of information at varying frequency | |
GB1168904A (en) | Receiver for F.M. Signals |