Method and system for reducing radiated emissions from a communications channel
First Claim
1. A method for reducing electromagnetic emissions associated with transmission of a signal from a first end of a communications channel to a second end of the communications channel, comprising the steps of:
- attenuating components of the signal at the first end of the communications channel; and
restoring the attenuated components of the signal at the second end of the communications channel.
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Accused Products
Abstract
A communications channel may radiate energy undesirably, for example in the form of electromagnetic radiation, when a communication signal transmits over the communications channel. Processing the signal before and after transmission on the communications channel can reduce the level of radiated energy. Signal processing in advance of transmission over the communications channel can transform the communication signal into a waveform that has a reduced propensity to emit radiated energy during transmission over the communications channel. Exemplary signal transformations can involve applying either frequency-selective or broadband attenuation to the communication signal. Following transmission of the waveform over the communications channel, the original communication signal can be restored via reversing the signal transformation. The reverse transformation can comprise applying frequency-selective gain or broadband gain to the transmitted waveform.
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Citations
67 Claims
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1. A method for reducing electromagnetic emissions associated with transmission of a signal from a first end of a communications channel to a second end of the communications channel, comprising the steps of:
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attenuating components of the signal at the first end of the communications channel; and restoring the attenuated components of the signal at the second end of the communications channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for upgrading a communications channel to provide a reduction in radiated emissions, comprising the steps of:
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disposing a transmitter at a first end of the communications channel and a receiver at a second end of the communications channel; coupling a signal attenuator between an output of the transmitter and the first end of the communications channel; and coupling a signal amplifier between the second end of the communications channel and the receiver. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A communication method, comprising the steps of:
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providing a first communication signal having a first eye diagram; providing a second communication signal, having a second eye diagram, in response to attenuating a selected frequency of the first communication signal; transmitting the second communication signal from a first end of a signal path to a second end of the signal path; and providing a third communication signal, having a third eye diagram, in response to amplifying the selected frequency of the transmitted second communication signal. - View Dependent Claims (24, 25, 26, 27)
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28. A communication system comprising:
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a first signal processor for coupling between an output of a transmitter and an first end of a transmission line; and a second signal processor for coupling between a second end of the transmission line and a receiver, wherein the first signal processor is operative to; receive a first signal from the transmitter; and produce a second signal, in response to attenuating frequencies of the first signal, for transmission on the transmission line, and wherein the second signal processor is operative to; receive the second signal from the transmission line; and reproduce the first signal, in response to amplifying the attenuated frequencies, for reception by the receiver. - View Dependent Claims (29, 30, 31, 32, 33)
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34. A communication method, comprising the steps of:
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providing a digital signal having a propensity to emit electromagnetic radiation in connection with transmission on a communication path; reducing the propensity to emit electromagnetic radiation in response to transforming the digital signal; and following transmission of the transformed digital signal on the communication path, essentially restoring the digital signal in response to reversing the transformation. - View Dependent Claims (35, 36, 37)
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38. A signal processing method, comprising the steps of:
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receiving a first signal that conveys information and that has a propensity to emit radiation during transmission over a communications channel; and in preparation for conveying the information over the communications channel, transforming the first signal into a second signal having a reduced propensity to emit radiation during transmission over the communications channel. - View Dependent Claims (39, 40, 41, 42, 43)
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44. A signal processing system comprising an operable to:
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receive from a signal source a communication signal that has a tendency to produce emissions of electromagnetic radiation from a communications channel during transmission of the communication signal over the communications channel; reduce the tendency in response to attenuating a selected frequency range of the received communication signal; and output the attenuated communication signal for transmission over the communications channel. - View Dependent Claims (45, 47, 48, 49, 50, 51)
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46. The signal processing system of claim 46, wherein the communication signal comprises the selected frequency range and another frequency range.
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52. A method for reducing a radiated emission profile of a communication signal that comprises a first signal component and a second signal component, the method comprising the steps of:
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determining that the first signal component contributes more to the radiated emission profile than does the second signal component; and removing the first signal component from the communication signal in preparation for transmitting the communication signal along a signal path. - View Dependent Claims (53, 54, 55, 56)
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57. A signal processing method, comprising the steps of:
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receiving a communication signal that has undergone a transformation to reduce radiated emissions during transmission over a communications channel; and processing the received communication signal to reverse the transformation. - View Dependent Claims (58, 59)
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60. A communication method, comprising the steps of:
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receiving a communication signal from which a signal component has been attenuated in advance of transmitting the communication signal over a communications channel; and amplifying the attenuated signal component. - View Dependent Claims (61, 62, 63)
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64. A communication system comprising an integrated circuit,
the integrated circuit operable to amplify a component of a communication signal that has been attenuated in advance of transmission of the communication signal over a communications channel, wherein the component of the communication signal is operable to induce radiated emissions associated with transmission over the communications channel.
Specification