ES460184A1 - Frequency-modulated data communications receivers - Google Patents
Frequency-modulated data communications receiversInfo
- Publication number
- ES460184A1 ES460184A1 ES460184A ES460184A ES460184A1 ES 460184 A1 ES460184 A1 ES 460184A1 ES 460184 A ES460184 A ES 460184A ES 460184 A ES460184 A ES 460184A ES 460184 A1 ES460184 A1 ES 460184A1
- Authority
- ES
- Spain
- Prior art keywords
- equaliser
- cancellation
- connected downstream
- frequency
- interference
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
This device is suitable for use under propagation conditions severely affected by interference, in particular in mobile stations, in which propagation delay differences occur at the receive location due to the alternate routing differences of the reflected carrier waves. The information losses caused by phase and amplitude distortion are thereby automatically identified according to their cause in two arrangements which complement one another, i.e. in an equaliser for dynamic cancellation and an equaliser for static cancellation. The equaliser for dynamic cancellation has a frequency discriminator (3) with a device connected downstream for noise peak detection (DE) and the equaliser for static cancellation (SE) has an amplitude demodulator (9) with a polarity inverter (11) connected downstream and controlled by a polarity integrator (12). Depending on the type of interference detected, one or the other equaliser is through-connected on the output side via a changeover switch (13) to the common output.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2628997A DE2628997C3 (en) | 1976-06-28 | 1976-06-28 | System for receiving frequency-modulated digital communication signals |
| DE2714439A DE2714439C3 (en) | 1977-03-31 | 1977-03-31 | System for receiving frequency-modulated digital communication signals |
| DE19772721526 DE2721526C3 (en) | 1977-05-12 | 1977-05-12 | System for receiving frequency-modulated digital communication signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES460184A1 true ES460184A1 (en) | 1978-12-01 |
Family
ID=27186896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES460184A Expired ES460184A1 (en) | 1976-06-28 | 1977-06-28 | Frequency-modulated data communications receivers |
Country Status (13)
| Country | Link |
|---|---|
| AT (1) | AT358631B (en) |
| CH (1) | CH619087A5 (en) |
| DK (1) | DK281077A (en) |
| ES (1) | ES460184A1 (en) |
| FI (1) | FI771996A (en) |
| FR (1) | FR2357115A1 (en) |
| GB (1) | GB1584641A (en) |
| IE (1) | IE45444B1 (en) |
| IT (1) | IT1086275B (en) |
| LU (1) | LU77628A1 (en) |
| NL (1) | NL178115C (en) |
| NO (1) | NO772272L (en) |
| SE (1) | SE417047B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2905471B1 (en) * | 1979-02-13 | 1980-02-21 | Siemens Ag | System for receiving frequency-modulated digital message signals |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3778727A (en) * | 1972-05-11 | 1973-12-11 | Singer Co | Crystal controlled frequency discriminator |
-
1977
- 1977-06-24 DK DK281077A patent/DK281077A/en unknown
- 1977-06-24 CH CH774377A patent/CH619087A5/en not_active IP Right Cessation
- 1977-06-27 NL NLAANVRAGE7707119,A patent/NL178115C/en not_active IP Right Cessation
- 1977-06-27 FR FR7719609A patent/FR2357115A1/en active Granted
- 1977-06-27 AT AT452177A patent/AT358631B/en not_active IP Right Cessation
- 1977-06-27 LU LU77628A patent/LU77628A1/en unknown
- 1977-06-27 NO NO772272A patent/NO772272L/en unknown
- 1977-06-27 SE SE7707400A patent/SE417047B/en unknown
- 1977-06-27 FI FI771996A patent/FI771996A/fi not_active Application Discontinuation
- 1977-06-28 GB GB20851/77A patent/GB1584641A/en not_active Expired
- 1977-06-28 ES ES460184A patent/ES460184A1/en not_active Expired
- 1977-06-28 IT IT25123/77A patent/IT1086275B/en active
- 1977-06-28 IE IE1324/77A patent/IE45444B1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL7707119A (en) | 1977-12-30 |
| NO772272L (en) | 1977-12-29 |
| ATA452177A (en) | 1980-02-15 |
| GB1584641A (en) | 1981-02-18 |
| LU77628A1 (en) | 1979-03-26 |
| SE417047B (en) | 1981-02-16 |
| IT1086275B (en) | 1985-05-28 |
| SE7707400L (en) | 1977-12-29 |
| FR2357115A1 (en) | 1978-01-27 |
| FR2357115B1 (en) | 1982-01-08 |
| NL178115C (en) | 1986-01-16 |
| FI771996A (en) | 1977-12-29 |
| IE45444L (en) | 1977-12-28 |
| IE45444B1 (en) | 1982-08-25 |
| NL178115B (en) | 1985-08-16 |
| CH619087A5 (en) | 1980-08-29 |
| AT358631B (en) | 1980-09-25 |
| DK281077A (en) | 1977-12-29 |
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