Communication privacy system
阅读：382发布：2022-08-09
专利汇可以提供Communication privacy system专利检索，专利查询，专利分析的服务。并且A communication system which employs masking signals to encode the transmitted signal and means to strip the masking signals at the receiving end. Provision is made for simple, replaceable, plug-in modules which determine the frequency of the masking signals. Provision is made for switching between a multiplicity of masking signals on a random basis. Further, the masking signals are present in the carrier only during transmission of intelligence making detection of the frequencies employed difficult.，下面是Communication privacy system专利的具体信息内容。
1. A communication system for signal waves comprising at least two stations, each with a transmitting section and a receiving section, connected by a wave transmission medium, said transmitting section comprising: a. means for inverting an information signal; b. means for selectively masking said information signal by the linear addition of at least one unmodulated noise signal at pseudo-random intervals of transmission, said intervals controlled by a characteristic of said information signal; c. means for transmitting said resulting masked signal through a media; said receiving section comprising: d. means for unmasking said masked signal; e. means for reinverting the inverted information signal; f. means for making the resulting information signal audible.
2. The communication system of claim 1 wherein the means for inverting the information signal comprises: a. a first amplifier arranged to receive and amplify the input signal waves, fs; b. a first oscillator for providing a signal, fm; c. a mixer arranged to receive the outputs of said amplifier and said oscillator to nonlinearly mix the two signals; and d. a first low pass filter connected to the output of said mixer for removing frequency components f21 m and (fm+fs) and passing frequency components (fm-fs).
3. The communication system of claim 2 wherein the means for masking said information signal comprises: a. a second oscillator for providing an unmodulated noise signal fn ; b. means for linearly summing said noise signal fn and the output of said first low pass filter; c. means for gating the output of said second oscillator to said summing means; d. control means responsive to the pseudorandom variations in amplitude of the information signal controlling the gating of said gating means when said amplitude is within a predetermined range of values; e. a second amplifier arranged to amplify the output of said summing means comprising frequency components (fn + (fm- fs)); and f. means for coupling the resulting output signal of said second amplifier to transmitting means.
4. The communication system of claim 3 wherein the means for unmasking said masked signal comprises: a. a third amplifier arranged to couple and amplify the resulting output signal from said transmission medium; b. a notch filter arranged to receive signals from said third amplifier and remove signals of frequency components, fn and passing signals of frequency components (fm-fs); and c. a second low pass filter arranged to receive signals from said notch filter and remove signals of frequency components above (fm-fs).
5. The communication system of claim 4 wherein the means for reinverting the inverted information signal comprises: a. a second oscillator of frequency fm; b. a demodulator arranged to receive the output signal from the second low pass filter and the output of the second oscillator; c. a third low pass filter arranged to receive signals from said demodulator for passing frequency components below fm; d. means for coupling the resulting unmasked signal from the third low pass filter to an output means.
6. The communication system of claim 3 wherein said information signal is an audio frequency.
7. The signaling system of claim 1 wherein the resulting sum of the information signal and the noise signal, when intercepted by a conventional receiver will reveal only the presence of the noise signal.
8. The communication system of claim 1 wherein said sections are plug-in modules which are readily removable.
9. The communication system of claim 1 including means for disabling the noise signal of the receiving station''s transmitting section when said receiving station is receiving a signal from another station.
10. The communication system of claim 1 including a plurality of stations and further comprising means for selectively interconnecting specific ones of said stations in operational relationship with each other.
11. The communication system of claim 10 wherein said means for selectively interconnecting is a switching means.
12. The communication system of claim 1 wherein said means for masking comprises: a. a plurality of oscillating means each providing an unmodulated noise signal of a different frequency; b. means for linearly summing a noise signal and said inverted information signal; c. control means responsive to the pseudorandom amplitude variations of the information signal, detecting when said amplitude is within predetermined ranges of values and generating different control signals for each of said ranges detected; and d. gating means capable of gating specified ones of said noise signals to said summing means in response to each of said different control signals.
13. The communication system as in claim 1 wherein said characteristic is the frequency of said information signal.
14. A communication system for signal waves comprising at least two stations, each with a transmitting section and a receiving section, connected by a wave transmission medium; said transmitting section comprising: a. a first amplifier arranged to receive and amplify the input signal waves, fs; b. a first oscillator for providing a signal, fm; c. a mixer arranged to receive the outputs of said amplifier and said oscillator to mix the two signals; d. a first low pass filter connected to the output of said mixer for removing frequency components fm and (fm+fs) and passing frequency components (fm-fs); e. a second oscillator for providing a signal, fn ; f. summing means for linearly combining the output of said first low pass filter with the output of said second oscillator; g. a switch for selectively connecting the output of said second oscillator to said summing means; h. control means for selectively controlling the opening and closing of said switch responsive to a predetermined range of input signal, fs; i. a second amplifier arranged to amplify the output of said summing means comprising frequency components (fn +(fm-fs)); j. coupling means for coupling the output of said second amplifier to the transmission medium; and said receiving section comprising: k. a third amplifier arranged to couple and amplify signals from said transmission medium;
15. A signaling system for transmitting an audio information signal comprising: a. means for frequency inverting the audio information signal by the addition of a first reference oscillator signal of frequency (fm) while maintaining the same audio bandwidth; b. means for removing the resulting upper side band frequency signals; c. means for selectively summing an unmodulated audio noise signal and the remaining signal at pseudorandom intervals of transmission, said intervals controlled by a characteristic of said audio information signal, said noise signal being of a magnitude sufficient to mask said audio information signal; d. means for transmitting said resulting masked signal through a media; e. means for receiving said resulting masked signal; f. means for removing said audio noise signal; g. means for reinverting said audio information signals with the aid of a second reference oscillator of frequency, fm; h. means for removing the unwanted upper side band frequencies; and i. means for making the audio information signal audible.
16. In a signaling system the method of coding the transmitted signal and decoding the received signal comprising: a. generating an audio information signal; b. inverting said signal by mixing with an oscillator signal and maintaining the original bandwidth; c. removing the upper side band frequencies of the resulting signal; d. pseudo-randomly summing linearly and selectively an unmodulated audio noise signal with the resulting signal said summing being dependent upon the amplitude of said audio information signal being within a predetermined range and said noise signal being of sufficient magnitude to effectively mask said audio information signal; e. transmitting the inverted and masked signal through a media; f. receiving said inverted and masked signal; g. removing said audio noise signal; h. reinverting said audio information signal with the aid of a second reference oscillator; i. removing the unwanted upper side band frequencies; and j. making the audio information signals audible.
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