US5375259A
Expired / Lapsed
US
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Analog signal noise reduction process and apparatus
Assignee: Individual
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Filing: 1992-02-20
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Granted: 1994-12-20
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Expires: 2012-02-20
Abstract
Abstract Process and apparatus for reduced noise reception of frequency modulated electromagnetic signal transmissions employing at least three spatially displaced receiving channels. The received at least three signals are continuously sampled at a high frequency, and the sampled signals are compared to each other. As a result of this comparison one sampled signal is selected and used for the reconstruction of the original transmission. The process is repeated for each sampling.
Inventors
- 👤 Denny L. Y. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:08
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0802; H04B7/0817; H04B7/082
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
140 words
Apparatus for receiving an analog information carrying signal having an amplitude, the information carrying signal having information and noise components, the information component also having frequencies associated with it, the apparatus comprising: (1) three discrete signal receiving channels for receiving the information carrying signal; (2) logic means connected to said signal receiving channels for comparing the amplitude of the information carrying signal received by each of the receiving channels and for: (a) when two or more of said signals received by said channels have substantially equal amplitudes, outputing any one of said two or more signals; (b) when no two or more signals received by said channels have substantially the same amplitude, outputing one of said signals received by one of said channels, whose amplitude is intermediate of the other two signals received by each of the other two channels.
Claim 2
Dependent Claim
140 words
Apparatus for receiving an analog information carrying signal having an amplitude, the information carrying signal having information and noise components, the information component also having frequencies associated with it, the apparatus comprising: (1) three discrete signal receiving channels for receiving the information carrying signal; (2) logic means connected to said signal receiving channels for comparing the amplitude of the information carrying signal received by each of the receiving channels and for: (a) when two or more of said signals received by said channels have substantially equal amplitudes, outputing any one of said two or more signals; (b) when no two or more signals received by said channels have substantially the same amplitude, outputing one of said signals received by one of said channels, whose amplitude is intermediate of the other two signals received by each of the other two channels.
Claim 3
Independent Claim
162 words
A method for receiving an analog information carrying signal having an amplitude, the information carrying signal having information and noise components, the information component also having frequencies associated with it, the method comprising the steps of: (1) receiving the analog information carrying signal, over "n" discrete channels, wherein "n" is an integer greater than 3, and producing n received signals each having an amplitude; (2) comparing the amplitude of the n received signals; (3) determining if there are any received signals having the same amplitude and if not, determining which two of the n received signals amplitudes have the least difference; (4) outputing any one of any received signals having the same amplitudes, and if no received signals have the same amplitude, outputing the received signal having an amplitude equal to a preselected one of the two received signals having the least difference in amplitudes; (5) repeating steps (2) through (4) at a frequency exceeding the highest frequency in the information signal.
Claim 4
Independent Claim
162 words
A method for receiving an analog information carrying signal having an amplitude, the information carrying signal having information and noise components, the information component also having frequencies associated with it, the method comprising the steps of: (1) receiving the analog information carrying signal, over "n" discrete channels, wherein "n" is an integer greater than 3, and producing n received signals each having an amplitude; (2) comparing the amplitude of the n received signals; (3) determining if there are any received signals having the same amplitude and if not, determining which two of the n received signals amplitudes have the least difference; (4) outputing any one of any received signals having the same amplitudes, and if no received signals have the same amplitude, outputing the received signal having an amplitude equal to a preselected one of the two received signals having the least difference in amplitudes; (5) repeating steps (2) through (4) at a frequency exceeding the highest frequency in the information signal.
Claim 5
Independent Claim
142 words
A method for receiving an analog information carrying signal having an amplitude, the information carrying signal having information and noise components, the information component also having frequencies associated with it, the method comprising the steps of: (1) receiving the analog information carrying signal, over 3 discrete channels, and producing 3 received signals each having an amplitude; (2) comparing the amplitudes of the 3 received signals; (3) determining if there are any received signals having the same amplitude and if not, determining which of the received signals has an amplitude which is intermediate to the other amplitudes (4) outputing any one of any received signals having the same amplitudes, and if no received signals have the same amplitude, outputing the received signal having the intermediate amplitude (5) repeating steps (2) through (4) at a frequency exceeding the highest frequency in the information signal.
Claim 6
Independent Claim
142 words
A method for receiving an analog information carrying signal having an amplitude, the information carrying signal having information and noise components, the information component also having frequencies associated with it, the method comprising the steps of: (1) receiving the analog information carrying signal, over 3 discrete channels, and producing 3 received signals each having an amplitude; (2) comparing the amplitudes of the 3 received signals; (3) determining if there are any received signals having the same amplitude and if not, determining which of the received signals has an amplitude which is intermediate to the other amplitudes (4) outputing any one of any received signals having the same amplitudes, and if no received signals have the same amplitude, outputing the received signal having the intermediate amplitude (5) repeating steps (2) through (4) at a frequency exceeding the highest frequency in the information signal.
Claim 7
Dependent Claim
151 words
Apparatus for receiving an analog information carrying signal having an amplitude, the information carrying signal having information and noise components, the information component also having frequencies associated with it, the apparatus comprising: (1) "n" discrete signal receiving channels, wherein "n" is an integer greater than 3; (2) logic means connected to each of said "n" discreet signal receiving channels for comparing the amplitude of the information carrying signal received by each of the "n" receiving channels and for, (a) determining if there are any received signals having the same amplitude and if not, determining which two of the n received signals amplitudes have the least difference; and (b) outputing any one of any received signals having the same amplitudes, and if no received signals have the same amplitude, outputing the received signal having an amplitude equal to a preselected one of the two received signals having the least difference in amplitudes.
Claim 8
Dependent Claim
151 words
Apparatus for receiving an analog information carrying signal having an amplitude, the information carrying signal having information and noise components, the information component also having frequencies associated with it, the apparatus comprising: (1) "n" discrete signal receiving channels, wherein "n" is an integer greater than 3; (2) logic means connected to each of said "n" discreet signal receiving channels for comparing the amplitude of the information carrying signal received by each of the "n" receiving channels and for, (a) determining if there are any received signals having the same amplitude and if not, determining which two of the n received signals amplitudes have the least difference; and (b) outputing any one of any received signals having the same amplitudes, and if no received signals have the same amplitude, outputing the received signal having an amplitude equal to a preselected one of the two received signals having the least difference in amplitudes.
Claim 9
Dependent Claim
57 words
The apparatus in accordance with claim 1 further comprising sampling means for simultaneously sampling said three received information carrying signals to produce three simultaneous sampled information carrying signals each of said sampled signals having an amplitude, and receiving means for receiving the information carrying signals, the sampling means connected between the receiving means and the logic means.
Claim 10
Dependent Claim
32 words
The method in accordance with claim 2 wherein the preselected received signal is the signal whose amplitude is the higher of the two received signals having the least difference in their amplitudes.
Claim 11
Dependent Claim
63 words
The method in accordance with claim 2 comprising an additional sampling step performed after the receiving step and prior to the comparing step, the sampling step comprising sampling each of said received signals, to provide "n" sampled signals which are then used for comparing, determining, and outputing, in the comparing, determining and outputing steps, and wherein the repeating step includes the sampling step.
Claim 12
Dependent Claim
64 words
The method in accordance with claim 3 comprising an additional sampling step performed after the receiving step and prior to the comparing step, the sampling step comprising sampling each of said 3 received signals, to provide 3 sampled signals which are then used for comparing, determining, and outputing in the comparing, determining and outputing steps, and wherein the repeating step includes the sampling step.
Claim 13
Dependent Claim
28 words
The apparatus in accordance with claim 4 wherein the preselected amplitude is the higher of the amplitudes of the two received signals having the least difference in amplitudes.
Claim 14
Dependent Claim
41 words
The apparatus in accordance with claim 9 wherein the logic means includes "n" comparators connected in parallel for comparing said "n" received signals to a ramp voltage and wherein the comparators have outputs and said outputs are connected to an adder.
Claim 15
Dependent Claim
34 words
The apparatus in accordance with claim 4 further comprising sampling means connected between said channels and said logic means for simultaneously sampling said received signal in said "n" channels to generate "n" sampled signals.
Claim 16
Independent Claim
36 words
The method in accordance with any of claims 2, 6, 7, 3, or 8, wherein each of said channels comprises an antenna and each antenna is spaced from any other antenna, to generate discrete received signals.
Claim 17
Independent Claim
25 words
The method in accordance with any one of claims 2, 6, 7, 3 or 8, wherein the information carrying signal is received over distinct paths.
Claim 18
Independent Claim
21 words
The method in accordance with claims 2 or 3 wherein the information carrying signal is a Frequency Modulated (FM) electromagnetic wave.
Claim 19
Independent Claim
32 words
The apparatus in accordance with any one of claims 4, 9, 11, 1, or 5, wherein the receiving channels each comprise an antenna and the antennas are spaced apart from each other.
Claim 20
Independent Claim
25 words
The apparatus in accordance with any one of claims 4, 9, 10, or 1, wherein the information carrying signal is an FM modulated electromagnetic wave.
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