Device for low-interfernce signal transmission
First Claim
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1. System for low-interference transmission of a signal, comprising:
- a transmitter for generating an output signal to be transmitted via a transmission circuit, the signal having substantially a line spectrum;
a modulator unit associated with the transmitter for modulating the output signal to be transmitted, or a carrier signal of transmitting means in the transmitter, or the output signal at any site in the transmission circuit, independently of a modulation technique selected for the purpose of signal transmission;
a receiver, spatially separated from the transmitter, for receiving a modulated transmitted signal via the transmission circuit; and
wherein the modulator unit modulates the signal so that spectral lines of the output signal are broadened to fill gaps between individual spectral lines, and a spectral power density of the output signal is reduced without a bandwidth of the output signal being substantially changed.
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Abstract
Digital signal transmitter devices mostly present a distinct wide-band interference spectrum which renders compliance with the presently applicable EMC standards substantially more difficult.
Available provisions for improving the EMC characteristics take an influence on the quality in transmission and on the immunity to interference.
By the inventive method the carrier signal or output signal, respectively, of the transmitter is so modulated that the narrow spectral lines are spread and the spectral power density is reduced.
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Citations
44 Claims
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1. System for low-interference transmission of a signal, comprising:
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a transmitter for generating an output signal to be transmitted via a transmission circuit, the signal having substantially a line spectrum; a modulator unit associated with the transmitter for modulating the output signal to be transmitted, or a carrier signal of transmitting means in the transmitter, or the output signal at any site in the transmission circuit, independently of a modulation technique selected for the purpose of signal transmission; a receiver, spatially separated from the transmitter, for receiving a modulated transmitted signal via the transmission circuit; and wherein the modulator unit modulates the signal so that spectral lines of the output signal are broadened to fill gaps between individual spectral lines, and a spectral power density of the output signal is reduced without a bandwidth of the output signal being substantially changed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. Method for low interference transmission of a signal, comprising the steps of:
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generating an output signal to be transmitted with a transmitter at a first location, the signal having substantially a line spectrum; modulating the signal to be transmitted, or a carrier signal of transmitting means in the transmitter, or an output signal at any site of the transmission circuit with a modulator unit, independently of a modulation technique selected for the purpose of signal transmission, to form a modulated signal; transmitting the modulated signal from the first location; receiving the modulated transmitted signal via a transmission circuit at a second location spatially separated from the first location; and wherein the signal is modulated so that spectral lines of the output signal are broadened to fill gaps between individual spectral lines, and a spectral power density of the generated signal is reduced, without a bandwidth of the generated signal being substantially changed. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. System for transmitting a digital data signal, comprising:
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a first stationary part; a second movable part; a transmitter for generating a transmitter output signal that includes a carrier signal and the data signal; a receiver for receiving the transmitter output signal; a transmission circuit coupling said transmitter to said receiver and for transmitting the transmitter output signal between said first stationary part and said second movable part; a modulator coupled to said transmission circuit for generating a modulation signal; a controller coupled to and controlling said modulator to generate the modulation signal and to apply the modulation signal at substantially any site in and along the transmission circuit to modulate the transmitter output signal so that a signal spectrum of the transmitter output signal is substantially distributed and a mean spectral power density of the transmitter output signal is reduced; and wherein the modulator modulates the transmitter output signal so that spectral lines of the transmitter output signal are broadened to fill gaps between individual spectral lines of the transmitter output signal, and a spectral power density of the transmitter output signal is reduced without a bandwidth of the transmitter output signal being substantially changed. - View Dependent Claims (44)
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Specification