FR2251136A1 - Elimination of interference signals in radio receiver - involves two-phase modulation of carrier signal from transmitter - Google Patents
Elimination of interference signals in radio receiver - involves two-phase modulation of carrier signal from transmitterInfo
- Publication number
- FR2251136A1 FR2251136A1 FR7434927A FR7434927A FR2251136A1 FR 2251136 A1 FR2251136 A1 FR 2251136A1 FR 7434927 A FR7434927 A FR 7434927A FR 7434927 A FR7434927 A FR 7434927A FR 2251136 A1 FR2251136 A1 FR 2251136A1
- Authority
- FR
- France
- Prior art keywords
- signal
- modulated
- transmitter
- interference signals
- elimination
- 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.)
- Withdrawn
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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar Systems Or Details Thereof (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The transmitter generates a carrier signal which is modulated with a signal for a symmetrical waveform with suppressed carrier. There are second elements for modulation of received signals with the modulation signal so that the interference signals from the transmitter coincides with the suppressed spectrum, while any useful signal is modulated; the compressed interferece signal is filtered out; the remaining modulated useful signal modulated in the receiver with the modulation signal in order to compress it and recover its original form; the modulation signal is a pseudo-noise code, or a maximum length shift register code and is in addition modulated with data to be transmitted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US41504073A | 1973-11-12 | 1973-11-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2251136A1 true FR2251136A1 (en) | 1975-06-06 |
Family
ID=23644106
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7434927A Withdrawn FR2251136A1 (en) | 1973-11-12 | 1974-10-17 | Elimination of interference signals in radio receiver - involves two-phase modulation of carrier signal from transmitter |
Country Status (5)
Country | Link |
---|---|
DE (1) | DE2449532A1 (en) |
FR (1) | FR2251136A1 (en) |
IL (1) | IL45586A0 (en) |
IT (1) | IT1019187B (en) |
NL (1) | NL7414749A (en) |
-
1974
- 1974-09-03 IL IL45586A patent/IL45586A0/en unknown
- 1974-09-04 IT IT52869/74A patent/IT1019187B/en active
- 1974-10-17 DE DE19742449532 patent/DE2449532A1/en active Pending
- 1974-10-17 FR FR7434927A patent/FR2251136A1/en not_active Withdrawn
- 1974-11-12 NL NL7414749A patent/NL7414749A/en unknown
Also Published As
Publication number | Publication date |
---|---|
IT1019187B (en) | 1977-11-10 |
IL45586A0 (en) | 1974-12-31 |
NL7414749A (en) | 1975-05-14 |
DE2449532A1 (en) | 1975-05-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5479442A (en) | Spectrum spread receiver and spectrum spread transmitter-receiver including same | |
DE3567779D1 (en) | Spread spectrum signal receiver | |
GB1079928A (en) | A data transmission system | |
SE7509996L (en) | MODULATION AND FILTRATION DEVICE | |
JPS5222867A (en) | Demodulation system for angle modulated wave signal | |
ES425145A1 (en) | Method for converting a binary coded data signal into a P-FSK coded signal | |
CA1032612A (en) | Receiver for the reception of pulse signals tranmsitted by means of frequency shift modulation | |
FR2251136A1 (en) | Elimination of interference signals in radio receiver - involves two-phase modulation of carrier signal from transmitter | |
GB1374043A (en) | Pulse code modulation transmission system | |
GB1212336A (en) | Transmission system for the transmission of information in a prescribed frequency band | |
FR2266985A1 (en) | Radio communication method for service conversations - has message and distance monitoring signal transmission in digital form | |
EP0325459A3 (en) | Digital modulator | |
DE3068626D1 (en) | Circuit for the demodulation of a signal modulated by digital information and receiver comprising such a circuit | |
JPS53131815A (en) | Phase linear type emphasizer | |
BG102091A (en) | Method for modulation and circuit for the transmission of data-containing signals | |
JPS5624851A (en) | Digital frequency modulating communication system | |
JPS52151510A (en) | Transmission and reception system and its device of quadrature multiplex signal | |
FR2255001A5 (en) | Radio signal system for roadways - uses pulse modulation of carrier wave and delayed retransmission | |
GB1206906A (en) | Receiver for receiving and demodulating frequency-modulated carrier waves | |
JPS5412610A (en) | Modulation system for binary ami code | |
FR2325254A1 (en) | Communications system using radio - has transmitter which produces conventionally coded frequency modulated binary data words of N bits | |
SAIUTIN | Optimal reception of an amplitude-modulated radio signal on a background of white and narrow-band noise(Optimal amplitude modulated radio signal reception on white and narrow band background noise, using nonlinear filtration and phase locked control) | |
ES455836A1 (en) | Method and circuit arrangement for the interference-free reception of the baseband of a baseband vocoder | |
FR2249509A1 (en) | Frequency modulation and differential phase demodulation system - provides signal with zero spectrum at zero frequency | |
FR2240580A2 (en) | Symmetrical digital modulator cct. - eliminates modulation products for interference free use in analogue communication systems |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |