Digital data decoder and method
First Claim
Patent Images
1. Apparatus for communicating digital data by radio frequency comprising:
- first site means generating digital data;
second site means, remote from the first site means, utilizing digital data corresponding to the digital data of the first site means;
the first site means comprising radio frequency transmitter means superimposing the digital data from the first site means upon a carrier waveform to create and transmit a composite sinusoidal wave form containing said digital data;
receiver means comprising the second site means remote from the radio frequency transmitter means receiving and processing said composite sinusoidal waveform;
said receiver means comprising means which demodulate a base band signal from the composite waveform;
means to which the base band signal is communicated, said last mentioned means creating positive and negative voltage spikes each time the base band signal goes positive and negative, respectively;
means at first and second comparator sites to which said voltage spikes are communicated;
means at each comparator site comparing the voltage of said spikes to a predetermined voltage level, the comparison at the two sites being of opposite polarity, respectively;
means at each comparator site normally issuing a constant known voltage signal and means interrupting said constant voltage signal when any said voltage spike exceeds the predetermined voltage level, either in the positive or in the negative, depending on the site;
means which receive the two interrupted voltage signals and combine the two interrupted voltage signals into a single output digital signal.
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Abstract
A system, including methods and apparatus, requiring digital communication between two devices using radio frequency communications to provide the link. Apparatus for decoding a digital data stream is provided, which data stream has been imposed on a base band signal where the rate of data transmission is as high as twice the frequency of the base band signal. A differential amplifier is employed to recognize the beginning and end of a segment of a wave cycle which represents a digital bit.
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Citations
20 Claims
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1. Apparatus for communicating digital data by radio frequency comprising:
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first site means generating digital data; second site means, remote from the first site means, utilizing digital data corresponding to the digital data of the first site means; the first site means comprising radio frequency transmitter means superimposing the digital data from the first site means upon a carrier waveform to create and transmit a composite sinusoidal wave form containing said digital data; receiver means comprising the second site means remote from the radio frequency transmitter means receiving and processing said composite sinusoidal waveform; said receiver means comprising means which demodulate a base band signal from the composite waveform; means to which the base band signal is communicated, said last mentioned means creating positive and negative voltage spikes each time the base band signal goes positive and negative, respectively; means at first and second comparator sites to which said voltage spikes are communicated; means at each comparator site comparing the voltage of said spikes to a predetermined voltage level, the comparison at the two sites being of opposite polarity, respectively; means at each comparator site normally issuing a constant known voltage signal and means interrupting said constant voltage signal when any said voltage spike exceeds the predetermined voltage level, either in the positive or in the negative, depending on the site; means which receive the two interrupted voltage signals and combine the two interrupted voltage signals into a single output digital signal. - View Dependent Claims (2, 3, 4)
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5. Apparatus for producing square waveforms corresponding to sinusoidal input waveforms comprising:
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a source of sinusoidal waveforms; means to which the sinusoidal waveforms are communicated, said means creating positive and negative voltage spikes each time the sinusoidal waveform goes positive and negative, respectively; means at first and second comparator sites to which said voltage spikes are communicated; means at each comparator site comparing the voltage of said spikes to a predetermined voltage level, the comparison at the two sites being of opposite polarity, respectively; means at each comparator site normally issuing a constant known voltage signal and means interrupting said constant voltage signal when the voltage spike exceeds the predetermined voltage level, either in the positive or in the negative, depending on the site; and means which receive the two interrupted voltage signals and integrate the two interrupted voltage signals into a single output square wave signal. - View Dependent Claims (6)
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7. Apparatus for communicating digital data by sinusoidal waveforms comprising:
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a source of digital data wherein the digital data is represented by sinusoidal waveforms, each half cycle substantially representing a digital bit; means to which the sinusoidal waveform is communicated, said means creating positive and negative voltage spikes each time the sinusoidal waveform goes positive and negative, respectively; means at first and second comparator sites to which said voltage spikes are communicated; means at each comparator site comparing the voltage of said spikes to a predetermined voltage level, the comparison at the two sites being of opposite polarity, respectively; means at each comparator site normally issuing a constant known voltage signal and means interrupting said constant voltage signal when the voltage spike exceeds the predetermined voltage level, either in the positive or in the negative depending on the site; and means which receive the two interrupted voltage signals and integrate the two interrupted voltage signals into a single output digital signal. - View Dependent Claims (8, 9, 10)
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11. A method for communicating digital data by radio frequency comprising:
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issuing digital data at a first location; superimposing the issued digital data upon a carrier waveform to create a composite sinusoidal waveform containing said digital data; transmitting said composite sinusoidal waveform at a predetermined site; receiving said composite sinusoidal waveform at a site remote from the predetermined site; demodulating a base band signal from the received composite waveform; creating positive and negative voltage spikes each time the demodulated base band signal goes positive and negative, respectively; communicating said positive and negative voltage spikes to first and second comparator sites; comparing the voltage of said spikes to a predetermined voltage level at each comparator site, the comparison at the two sites being of opposite polarity, respectively; issuing a constant known voltage signal at each comparator site; interrupting said constant voltage signal when the voltage spike exceeds the predetermined voltage level, either in the positive or in the negative, depending on the site; integrating the two interrupted voltage signals into a single output digital data signal corresponding to the digital data initially issued; and utilizing said output digital data signal. - View Dependent Claims (12, 13, 14)
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15. A method for producing a square waveform corresponding to a sinusoidal waveform comprising:
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producing a sinusoidal waveform; creating positive and negative voltage spikes each time the sinusoidal waveform goes positive and negative, respectively; communicating said positive and negative voltage spikes to first and second comparator sites; comparing the voltage of said spikes to a predetermined voltage level at each comparator site, the comparison at the two sites being of opposite polarity, respectively; issuing a constant known voltage signal at each comparator site; interrupting said constant voltage signal when the voltage spike exceeds the predetermined voltage level, either in the positive or in the negative, depending on the site; and integrating the two interrupted voltage signals into a single output square waveform corresponding to the initially produced sinusoidal waveform. - View Dependent Claims (16)
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17. A method for communicating digital data by sinusoidal waveform comprising:
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generating digital data wherein the digital data is represented by a sinusoidal waveform, each half cycle substantially representing a single digital bit; creating positive and negative voltage spikes each time the sinusoidal waveform goes positive and negative, respectively; communicating said voltage spikes to first and second comparator sites; comparing the voltage of said spikes to a predetermined voltage level at each comparator site, the comparison at the two sites being of opposite polarity, respectively; issuing a constant known voltage signal at each comparator site; interrupting said constant voltage signal when the voltage spike exceeds the predetermined voltage level, either in the positive or in the negative depending on the site; and integrating the two interrupted voltage signals into a single output digital signal corresponding to the initially generated digital data. - View Dependent Claims (18, 19, 20)
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Specification