GB1151614A - Improvements in or relating to Electric Signal Receivers - Google Patents
Improvements in or relating to Electric Signal ReceiversInfo
- Publication number
- GB1151614A GB1151614A GB858267A GB858267A GB1151614A GB 1151614 A GB1151614 A GB 1151614A GB 858267 A GB858267 A GB 858267A GB 858267 A GB858267 A GB 858267A GB 1151614 A GB1151614 A GB 1151614A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filters
- filter
- binary data
- frequency shift
- feb
- 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
- 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
- H04L27/148—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using filters, including PLL-type filters
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
Abstract
1,151,614. Data transmission systems; V.F. signalling. GENERAL ELECTRIC & ENGLISH ELECTRIC COMPANIES Ltd. 8 Feb., 1968 [22 Feb., 1967], No. 8582/67. Headings H4P and H4R. In a frequency shift binary data receiver in which the binary data may be represented by either of two pairs of frequencies, two filters are connected in parallel, one or other filter being shorted out depending on which pair of frequencies is being received. The frequency shift signals pass via a filter 1 and emitter follower 3 to the two filters 5, 6. The amplifier is matched to the filters by resistors 16, 17. Transistors 22, 23 are selectively enabled to short the input of the corresponding filter. The filters feed mixer 8 via amplifier 7. The mixer feeds a band-pass filter connected to a limiter which feeds a tuned circuit. This develops a frequency shift signal whose amplitude varies with frequency. A rectifier derives the binary data from this signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB858267A GB1151614A (en) | 1967-02-22 | 1967-02-22 | Improvements in or relating to Electric Signal Receivers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB858267A GB1151614A (en) | 1967-02-22 | 1967-02-22 | Improvements in or relating to Electric Signal Receivers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1151614A true GB1151614A (en) | 1969-05-14 |
Family
ID=9855239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB858267A Expired GB1151614A (en) | 1967-02-22 | 1967-02-22 | Improvements in or relating to Electric Signal Receivers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1151614A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2478901A1 (en) * | 1980-03-18 | 1981-09-25 | Jeumont Schneider | HIGHER AMPLITUDE ALTERNATING SIGNAL SELECTION STAGE AMONG TWO DIFFERENT FREQUENCY SIGNALS |
-
1967
- 1967-02-22 GB GB858267A patent/GB1151614A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2478901A1 (en) * | 1980-03-18 | 1981-09-25 | Jeumont Schneider | HIGHER AMPLITUDE ALTERNATING SIGNAL SELECTION STAGE AMONG TWO DIFFERENT FREQUENCY SIGNALS |
WO1981002714A1 (en) * | 1980-03-18 | 1981-10-01 | Jeumont Schneider | Selection stage of the ac signal having the greater amplitude |
US4488238A (en) * | 1980-03-18 | 1984-12-11 | Jeumont-Schneider Corporation | Selection stage of the AC signal of greater amplitude between two signals of different frequencies |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |