GB1455392A - Data transmission systems - Google Patents
Data transmission systemsInfo
- Publication number
- GB1455392A GB1455392A GB1804874A GB1804874A GB1455392A GB 1455392 A GB1455392 A GB 1455392A GB 1804874 A GB1804874 A GB 1804874A GB 1804874 A GB1804874 A GB 1804874A GB 1455392 A GB1455392 A GB 1455392A
- Authority
- GB
- United Kingdom
- Prior art keywords
- counter
- count
- signal
- april
- flank
- 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
- H04L27/156—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width
- H04L27/1563—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width using transition or level detection
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
1455392 Frequency demodulation SIEMENS AG 25 April 1974 [30 April 1973] 18048/74 Heading H3A In a modulator for a FSK signal B1, B2 of the type in which a counter Z counts pulses from a clock generator GEN for periods determined by first and second flanks of pulses of the signal to be demodulated, the counter reaches a maximum count and is reset a number of times during a count period; the digital output of the counter is connected to a digital/analogue converter DIG/A by gates G1, G2, G3 opened at the second flank; and the output of the converter is connected via a lowpass filter TP to a threshold stage ScH. The maximum count of the counter is selected such that the residual count at the arrival of the second flank differs for the different frequencies to be detected, so that the resulting analogue signal will have a value dependent on the input frequency. The circuit of Fig. 3 operates in one half cycle of the input only, but in an alternative form the units preceding the filter may be duplicated to give operation on both half cycles, Fig. 5 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19732321887 DE2321887A1 (en) | 1973-04-30 | 1973-04-30 | METHOD FOR DEMODULATING A FREQUENCY MODULATED SIGNAL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1455392A true GB1455392A (en) | 1976-11-10 |
Family
ID=5879732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1804874A Expired GB1455392A (en) | 1973-04-30 | 1974-04-25 | Data transmission systems |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5017160A (en) |
| BE (1) | BE814403A (en) |
| CH (1) | CH570083A5 (en) |
| DE (1) | DE2321887A1 (en) |
| FR (1) | FR2227695B1 (en) |
| GB (1) | GB1455392A (en) |
| IT (1) | IT1010194B (en) |
| NL (1) | NL7405473A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56132548A (en) * | 1980-03-21 | 1981-10-16 | Olympus Optical Co Ltd | Automatic analyzer |
| US4868861A (en) * | 1988-04-28 | 1989-09-19 | Amaf Industries, Inc. | Trunk dialing converter |
-
1973
- 1973-04-30 DE DE19732321887 patent/DE2321887A1/en active Pending
-
1974
- 1974-04-23 NL NL7405473A patent/NL7405473A/xx unknown
- 1974-04-25 GB GB1804874A patent/GB1455392A/en not_active Expired
- 1974-04-26 CH CH574074A patent/CH570083A5/xx not_active IP Right Cessation
- 1974-04-29 IT IT2202974A patent/IT1010194B/en active
- 1974-04-30 BE BE143791A patent/BE814403A/en unknown
- 1974-04-30 FR FR7414950A patent/FR2227695B1/fr not_active Expired
- 1974-04-30 JP JP4866274A patent/JPS5017160A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5017160A (en) | 1975-02-22 |
| CH570083A5 (en) | 1975-11-28 |
| NL7405473A (en) | 1974-11-01 |
| FR2227695B1 (en) | 1977-03-04 |
| IT1010194B (en) | 1977-01-10 |
| FR2227695A1 (en) | 1974-11-22 |
| DE2321887A1 (en) | 1974-11-07 |
| BE814403A (en) | 1974-10-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |