US6430210B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Receiver for detecting an amplitude modulated signal insinuated on an GHM signal
Assignee: ABB Schweiz AG
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Filing: 1999-04-05
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Granted: 2002-08-06
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Expires: 2019-04-05
Abstract
Abstract A receiver for enabling one-way communications in a GHM network which does not interfere with or reduce the capability of the GHM network. The receiver detects a small modulation factor signal present on the GHM signal normally transmitted by the GHM transmitter. If the frequency of the modulated signal corresponds to a pre-defined frequency, then the receiver generates a command signal to, for example, a relay, annunciator, or other external device. More particularly, and in one embodiment, the receiver includes a filter which partially isolates the GHM energy from the lower 60 Hz harmonics. The receiver also includes a envelope detector coupled to filter. The envelope detector is coupled to a frequency detector. The frequency detector is coupled to a command decoder. The command decoder determines whether a plurality of AM modulation frequencies are present on the received signal. If the AM modulation signal is a specified frequency the decoder generates a signal which, in turn, causes signal generator to generate a command signal for transmission to an external device.
Inventors
- 👤 Donald Thomas McGrath
- 👤 II Kenneth Brakeley Welles
- 👤 John Erik Hershey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:19
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/26; H04L27/28
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
133 words
A GHM based power line receiver coupled to a power line, the power line also adapted to be coupled to a GHM transmitter, which transmitter is adapted to generate a GHM signal having an amplitude modulated signal insinuated thereon, said GHM receiver comprising: a filter coupled to the power line for detecting the amplitude modulated signal insinuated on the GHM signal; an envelope detector coupled to said filter for detecting the envelope of the amplitude modulated signal passed by said filter; a frequency detector coupled to said envelope detector for detecting the frequency of the envelope of the amplitude modulated signal generated by said envelope detector; and a decoder coupled to said frequency detector for generating a respective drive signal corresponding with a respective frequency of the envelope of the amplitude modulated signal.
Claim 2
Dependent Claim
133 words
A GHM based power line receiver coupled to a power line, the power line also adapted to be coupled to a GHM transmitter, which transmitter is adapted to generate a GHM signal having an amplitude modulated signal insinuated thereon, said GHM receiver comprising: a filter coupled to the power line for detecting the amplitude modulated signal insinuated on the GHM signal; an envelope detector coupled to said filter for detecting the envelope of the amplitude modulated signal passed by said filter; a frequency detector coupled to said envelope detector for detecting the frequency of the envelope of the amplitude modulated signal generated by said envelope detector; and a decoder coupled to said frequency detector for generating a respective drive signal corresponding with a respective frequency of the envelope of the amplitude modulated signal.
Claim 3
Dependent Claim
15 words
A receiver in accordance with claim 1 , wherein said filter comprises a bandpass filter.
Claim 4
Dependent Claim
29 words
A receiver in accordance with claim 1 , wherein said filter comprises a comb filter having narrow pass band windows centered on un-modulated frequency components of the GHM signal.
Claim 5
Dependent Claim
16 words
A receiver in accordance with claim 1 , wherein said envelope detector comprises a square-wave detector.
Claim 6
Dependent Claim
25 words
A receiver in accordance with claim 1 , wherein the amplitude modulated frequency is in a range from about 0.25 Hertz to about 3.0 Hertz.
Claim 7
Dependent Claim
36 words
A receiver in accordance with claim 1 , wherein said frequency detector includes a detector selected from the group including at least one tuned filter, a Fast Fourier Transform (FFT) analyzer, or a digital signal processor.
Claim 8
Dependent Claim
35 words
A receiver in accordance with claim 1 further comprising a signal generator coupled to said decoder, wherein said signal generator is configured to generate a respective command signal in correspondence with said respective drive signal.
Claim 9
Dependent Claim
112 words
A GHM based power line receiver coupled to a power line, the power line also adapted to be coupled to a GHM transmitter, which transmitter is adapted to generate a GHM signal having an amplitude modulated signal insinuated thereon, said GHM receiver comprising: means for filtering the power line so as to detect the amplitude modulated signal insinuated on the GHM signal; means for detecting the envelope of the amplitude modulated signal insinuated on the GHM signal; means for detecting the frequency of the envelope of the amplitude modulated signal insinuated on the GHM signal; and means for generating a respective drive signal in correspondence with a respective amplitude modulated envelope frequency.
Claim 10
Dependent Claim
112 words
A GHM based power line receiver coupled to a power line, the power line also adapted to be coupled to a GHM transmitter, which transmitter is adapted to generate a GHM signal having an amplitude modulated signal insinuated thereon, said GHM receiver comprising: means for filtering the power line so as to detect the amplitude modulated signal insinuated on the GHM signal; means for detecting the envelope of the amplitude modulated signal insinuated on the GHM signal; means for detecting the frequency of the envelope of the amplitude modulated signal insinuated on the GHM signal; and means for generating a respective drive signal in correspondence with a respective amplitude modulated envelope frequency.
Claim 11
Dependent Claim
31 words
The GHM receiver as recited in claim 8 , further comprising means for generating a respective command signal for driving a respective external device, in correspondence with said respective drive signal.
Claim 12
Independent Claim
79 words
A method of detecting a amplitude modulated signal insinuated on a GHM signal superimposed on a power line signal, said method comprising the following steps: filtering the power line signal so as to detect the amplitude modulated signal insinuated on the GHM signal; detecting the envelope of the amplitude modulated signal; detecting the frequency of the envelope of the amplitude modulated signal; and generating a respective drive signal corresponding with a respective envelope frequency of the amplitude modulated signal.
Claim 13
Independent Claim
79 words
A method of detecting a amplitude modulated signal insinuated on a GHM signal superimposed on a power line signal, said method comprising the following steps: filtering the power line signal so as to detect the amplitude modulated signal insinuated on the GHM signal; detecting the envelope of the amplitude modulated signal; detecting the frequency of the envelope of the amplitude modulated signal; and generating a respective drive signal corresponding with a respective envelope frequency of the amplitude modulated signal.
Claim 14
Dependent Claim
36 words
The method as recited in claim 10 , further comprising the step of generating a respective command signal for driving a respective external device, wherein said respective drive signal corresponds with said respective frequency drive signal.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 2005-08-05 | 2006-02-04 | 2006-08-06 | $2000.00 | Window Closed / Lapsed |
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