EP1195932B1 - Dispositif radiofréquence comportant un détecteur de niveau pour la suppression de bruit - Google Patents
Dispositif radiofréquence comportant un détecteur de niveau pour la suppression de bruit Download PDFInfo
- Publication number
- EP1195932B1 EP1195932B1 EP20010119897 EP01119897A EP1195932B1 EP 1195932 B1 EP1195932 B1 EP 1195932B1 EP 20010119897 EP20010119897 EP 20010119897 EP 01119897 A EP01119897 A EP 01119897A EP 1195932 B1 EP1195932 B1 EP 1195932B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- input
- radio frequency
- level
- threshold value
- switching means
- 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 - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
Definitions
- the invention relates to a high-frequency device, in particular an antenna socket, according to the features of the preamble of claim 1.
- NTU network terminal units
- a high-frequency device having at least one input and at least one output for connecting devices to distribution networks
- the high-frequency device comprises detection means for detecting the level at the input and switching means which switch in dependence on the detected level.
- the high-frequency device in particular its detection and switching means, consists of active electronic components. These need a power supply for correct operation, for example, the known high-frequency device, which operates with operational amplifiers, without external power supply will not work. This means that it is not possible to sufficiently supply the high frequency device with electrical energy from the signal energy available at the input antenna.
- this prior art does not describe the interference-free reverse channel operation which is essential in the transmission or processing of high-frequency signals in distribution networks, which is an essential quality feature.
- the trouble-free reverse channel operation is an essential quality feature interactive communication systems the resulting signal-to-noise ratio and thus the bit error rate is a deciding factor.
- a modem which is connected to the antenna socket or to the NTU transmits at a level of approximately 113 dB ⁇ V into the distribution network at approximately 5 to 65 MHz.
- the modem still has a noise / noise power of about 40 dB ⁇ V, which is fed into the distribution network.
- the noise level increases by the decimal logarithm of the number of participants, so that in the summation point noise levels in an intolerable size (in particular 73dB ⁇ V at 2000 subscribers) are reached.
- the invention is therefore based on the object, a high-frequency device, in particular an antenna socket to provide, which prevents the coupling of interference in the distribution network, especially in reverse channel operation.
- the high-frequency device in particular the antenna socket, is designed as a passive device.
- the high-frequency device has detection means for detecting the level at the input, and switching means which switch in response to the detected level.
- a device such as an antenna socket, a device such.
- B. a Modem is connected or not. Become levels that are above a certain threshold detected, this is the connection of a device, in particular is detected on the transmission mode of the modem and its signals are forwarded to the distribution network. If the detected levels are below a certain value, it is automatically detected that these are interference signals or noise. These signals are blocked by the switching means and can not get into the distribution network. This effectively prevents the feeding of noise levels into the distribution network, so that its operation is properly ensured.
- the switching means have a threshold value, wherein when the threshold value is exceeded or fallen below by the detected level, a switch can be actuated. If the detected level is above the threshold, the switch is or remains closed, so that a connection of the input of the antenna socket to its output, ie in the direction of the distribution network, is given. If the detected level is below the threshold, the switch is or remains open, so that the noise can not get into the distribution network.
- the threshold value for the level is adjustable.
- the antenna socket can be adjusted to the conditions of the distribution network, in particular depending on the connected participants.
- the threshold value specification is manufacturer-adjustable once or by the user before or after installation of the antenna socket once or arbitrarily often changed.
- the means, in particular the detection and switching means at least partially, preferably in total, constructed of discrete electronic components.
- the discrete electronic components can be accommodated in a small space, especially if it is the components to SMD components.
- An integration of the components as an ASIC is also conceivable.
- the passive antenna socket according to the invention can thus be replaced by conventional antenna sockets. From the signal energy applied to the input, a small part is used to operate the switching means. For this purpose, the HF signal is advantageously balanced and the DC voltage thus generated used to actuate the switching means in an advantageous manner.
- FIG. 1 shows an antenna socket 1, which has at least one input E and an output A.
- a modem is connected, whose signals are fed via the output A in the distribution network connected there.
- a detector 2 is integrated, which detects the voltage applied to the input E level.
- the detector 2 is followed by a threshold value 3, which acts on a switch 4, which is located in the signal path between the input E and the output A.
- the detector 2 and the threshold value specification 3 can also be combined to form a threshold value switch.
- FIG. 2 shows the attenuation curve of the switching means as a function of the input level.
- the modem transmission mode is detected by the detector 2 and its signal is forwarded by closing or by the closed switch 4.
- the specification of the threshold is here just below 90 dB ⁇ V at levels that are well below 90 dB ⁇ V, in particular less than 80 dB ⁇ V, are detected as noise level or as noise, so that the switch 4 remains open or is opened and the blocks off at the input E signals.
- the input level EP is shown on the X-axis and the corresponding damping D on the Y-axis.
- the remaining basic attenuation of about 2 dB results from the power extraction of the RF signal to obtain the required switching power for the switching means (such as diode, transistor or the like).
- FIG. 3 shows a circuit diagram with electronic components that can be integrated individually or in combination (eg in an Asic) in the antenna socket 1.
- smoothing capacitors C are present at the input E and at the output A.
- the signal energy of the modem connected to the input E passes through the capacitor C to a transformer TR, in which the applied RF voltage is up-converted, so that the required voltage is available for the following components. If, for example, 100 dB ⁇ V is present at input E at a 75 ohm termination, this corresponds to a voltage of 100 millivolts, which is up-converted by the transformer TR in the ratio 1: 5, for example.
- the downstream resistor R1 is a load resistor which is connected to ground.
- the diode D1 downstream capacitor C1 serves as a filter capacitor.
- the diode D1 a throttle DR in the direction of the signal path between input E and output A downstream.
- This choke DR has the task of passing the DC current flowing through the diode D1 in the direction of the signal path, thereby causing the switching means in the form of a diode D2 becomes conductive, which is connected to its cathode to ground.
- the choke DR forms a high resistance at high frequencies, so that a short across the choke DR to ground for RF signals is prevented.
- the diode D2 By impressed in the diode D2 current, which is present only when a signal applied to the input E, the diode D2 is conductive, so that the signal path between input E and output A is released. Lies at the input E no voltage or so low voltage that no sufficient current can be impressed in the diode D2, the diode D2 blocks the signal path between input E and output A.
- FIG. 3 shown circuit in particular by selecting the components and possibly by omitting or adding components
- the high frequency device in particular the antenna socket, for connecting a device, preferably also for connecting a plurality of devices may be formed.
- the antenna socket is designed to connect to a modem as well as a TV and a radio to the distribution network.
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Radio Transmission System (AREA)
- Noise Elimination (AREA)
Claims (5)
- Appareil à haute fréquence comprenant au moins une entrée (E) et au moins une sortie (A) pour raccorder des appareils tels que des modems ou similaire à des réseaux de distribution, l'appareil à haute fréquence présentant des moyens de détection pour détecter le niveau à l'entrée (E) ainsi que des moyens de commutation qui commutent en fonction du niveau détecté, caractérisé en ce qu'il est réalisé sous la forme d'un appareil à haute fréquence passif qui utilise l'énergie du signal à l'entrée (E) pour l'alimentation électrique des moyens.
- Appareil à haute fréquence selon la revendication 1, caractérisé en ce que les moyens de commutation présentent une consigne de valeur de seuil (3), un commutateur (4) pouvant être actionné lorsque le niveau détecté franchit la valeur de seuil dans un sens ou dans l'autre.
- Appareil à haute fréquence selon la revendication 1 ou 2, caractérisé en ce que la consigne de valeur de seuil (3) pour le niveau est réglable.
- Appareil à haute fréquence selon la revendication 1, 2 ou 3, caractérisé en ce que les moyens sont au moins partiellement constitués de composants électroniques discrets, notamment des composants CMS ou intégrés dans un ASIC.
- Appareil à haute fréquence selon l'une des revendications précédentes, réalisé sous la forme d'une embase d'antenne (1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2000147239 DE10047239A1 (de) | 2000-09-23 | 2000-09-23 | Hochfrequenzgerät mit Pegelerfassung zur Störunterdrückung |
DE10047239 | 2000-09-23 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1195932A2 EP1195932A2 (fr) | 2002-04-10 |
EP1195932A3 EP1195932A3 (fr) | 2004-07-14 |
EP1195932B1 true EP1195932B1 (fr) | 2009-07-15 |
Family
ID=7657402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20010119897 Expired - Lifetime EP1195932B1 (fr) | 2000-09-23 | 2001-08-17 | Dispositif radiofréquence comportant un détecteur de niveau pour la suppression de bruit |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1195932B1 (fr) |
DE (2) | DE10047239A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005036810B4 (de) * | 2005-08-04 | 2007-09-06 | Kathrein-Werke Kg | HF-Dose |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6128470A (en) * | 1996-07-18 | 2000-10-03 | Ericsson Inc. | System and method for reducing cumulative noise in a distributed antenna network |
-
2000
- 2000-09-23 DE DE2000147239 patent/DE10047239A1/de not_active Ceased
-
2001
- 2001-08-17 EP EP20010119897 patent/EP1195932B1/fr not_active Expired - Lifetime
- 2001-08-17 DE DE50114987T patent/DE50114987D1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE50114987D1 (de) | 2009-08-27 |
DE10047239A1 (de) | 2002-04-25 |
EP1195932A2 (fr) | 2002-04-10 |
EP1195932A3 (fr) | 2004-07-14 |
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