 FM demodulator including tuning of a filter and detector |
| OF THE PREFERRED EMBODIMENT A demodulator circuit embodying the invention is shown in FIG. 2 and ... |
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| Satellite communication system |
| Briefly, there is provided a satellite communication system in which a satellite receives a signal ... |
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| Accessing a video message via video snapshots |
| This invention is directed to solving these and other problems and disadvantages of the prior art. A... |
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| Multiple dwelling unit interactive audio/video distribution system |
| The present invention is an audio/video distribution system in which video on demand programming ... |
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| Video signal processing circuit with comb filter |
| The primary object of the present invention is to provide a video signal processing circuit which ... |
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| Comb filters |
| According to the present invention there is provided a filter circuit for processing a composite ... |
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Facility for combining and amplifying two broadband signals
| Details |
Inventors: Steigenberger, Ulrich; Hagele, Volker;
Assignee: Alcatel (Paris, FR)
Primary Examiner: Pascal; Robert
Assistant Examiner: Choe; Henry
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
A facility (VOR) is disclosed for combining and amplifying two broadband signals which are received from different transmission networks (NET1, NET2) and are transmitted in transmission channels separated in frequency. The facility (VOR) contains a broadband amplifier (BV), a preamplifier (VV), and a frequency filter unit (FW). The preamplifier (VV) and the frequency filter unit (FW) condition the signals to be amplified and establish an optimized signal-to-noise ratio between the two combined broadband signals: The preamplifier adapts the level of one of the signals to the level of the other signal, e.g., to the same value, whereby a linear and increased amplification is achieved in the broadband amplifier, and the filtering of the signals in the frequency filter unit prevents interfering signals, e.g., noise, contained in said one signal from getting into the frequency band occupied by the other signal and vice versa when the two signals are combined. |
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DETAILED DESCRIPTION It is therefore an object of the invention to provide a facility which is suitable for combining and amplifying two broadband signals that are received from different transmission networks and are transmitted in transmission channels separated in frequency.
This object is attained by the facility according to claim 1.
The facility is characterized in that it comprises a preamplifier and a frequency filter unit which condition the signals to be amplified and optimize the signal-to-noise ratio between the two combined broadband signals: The preamplifier adapts the level of one of the signals to the level of the other signal, e.
g.
, to the same value, whereby a linear and increased amplification is achieved in the broadband amplifier, and the filtering of the signals in the frequency filter unit prevents interfering signals, e.
g.
, noise, contained in said one signal from getting into the frequency band occupied by the other signal and vice versa when the two signals are combined.
Further advantageous features of the invention are defined in the dependent claims.
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Multiplexer-related 
