Phase- and frequency-fluctuation included in a transmitted signal

Claim 1

A system for eliminating unknown sudden phase fluctuations in transmitted telegraph signals including a reference signal which is separable by filter means, comprising: equalizing means for equalizing transmission times of the respective signals transmitted in a transmission medium at one end of which said unknown sudden fluctuations occur, filter means coupled to said equalizing means for deriving the reference signal from the transmitted signals passed through said equalizing means, generator means for generating a standard signal having a substantially stable phase-position, detection means coupled to said filter means and said geNerator means for detecting a phase difference between the standard signal and the transmitted reference signal derived from the filter means, delay means coupled to said equalizing means for delaying for a given delay time the transmitted signals passed through said equalizing means, modulation means coupled to said delay means and said detection means for modulating the transmitted signals passed through said delay means in accordance with said difference to cancel said fluctuations, and means coupled between said generator means and detection means for synchronizing the phaseposition of said standard signal with an average phase-position of said transmitted reference signal integrated during a time considerably longer than the duration of said fluctuations, said delay means having a delay time determined so that instantaneous fluctuated phase-positions of the transmitted signals are timed with instantaneous values of the difference at the modulation means, whereby the unknown sudden phase fluctuations included in the transmitted signals and usually not received simultaneously are eliminated simultaneously in the modulation means.

Claim 2

A system for eliminating unknown sudden phase fluctuations in transmitted telegraph signals including a reference signal which is separable by filter means, comprising: equalizing means for equalizing transmission times of the respective signals transmitted in a transmission medium at one end of which said unknown sudden fluctuations occur, filter means coupled to said equalizing means for deriving the reference signal from the transmitted signals passed through said equalizing means, generator means for generating a standard signal having a substantially stable phase-position, detection means coupled to said filter means and said geNerator means for detecting a phase difference between the standard signal and the transmitted reference signal derived from the filter means, delay means coupled to said equalizing means for delaying for a given delay time the transmitted signals passed through said equalizing means, modulation means coupled to said delay means and said detection means for modulating the transmitted signals passed through said delay means in accordance with said difference to cancel said fluctuations, and means coupled between said generator means and detection means for synchronizing the phaseposition of said standard signal with an average phase-position of said transmitted reference signal integrated during a time considerably longer than the duration of said fluctuations, said delay means having a delay time determined so that instantaneous fluctuated phase-positions of the transmitted signals are timed with instantaneous values of the difference at the modulation means, whereby the unknown sudden phase fluctuations included in the transmitted signals and usually not received simultaneously are eliminated simultaneously in the modulation means.

Claim 3

A system for eliminating unknown sudden phase-fluctuations in transmitted telegraph signals including a reference signal which is separable by filter means, comprising: equalizing means for equalizing transmission times of the respective signals transmitted in a transmission medium at one end of which said unknown sudden fluctuations occur, filter means coupled to said equalizing means for deriving the reference signal from the transmitted signals passed through said equalizing means, generator means for generating a standard signal having a substantially stable phase-position, a fist mixer coupled to said generator means and said filter means for detecting a difference between the standard signal and the transmitted reference signal derived from the filter means, delay means coupled to said equalizing means for delaying the transmitted signals passed through said equalizing means, a second mixer coupled to said delay means and said first mixer for combining the transmitted signals passed through said delay means with said detected difference to cancel said fluctuations, the delay time of said delay means being determined so that instantaneous phase fluctuations of the transmitted signals are timed with instantaneous fluctuated values of the difference at said second mixer, whereby the unknown sudden fluctuations included in the transmitted signals and usually not received simultaneously are simultaneously eliminated in the second mixer.

Claim 4

A system for eliminating unknown sudden phase-fluctuations in transmitted telegraph signals including a reference signal which is separable by filter means, comprising: equalizing means for equalizing transmission times of the respective signals transmitted in a transmission medium at one end of which said unknown sudden fluctuations occur, filter means coupled to said equalizing means for deriving the reference signal from the transmitted signals passed through said equalizing means, generator means for generating a standard signal having a substantially stable phase-position, a fist mixer coupled to said generator means and said filter means for detecting a difference between the standard signal and the transmitted reference signal derived from the filter means, delay means coupled to said equalizing means for delaying the transmitted signals passed through said equalizing means, a second mixer coupled to said delay means and said first mixer for combining the transmitted signals passed through said delay means with said detected difference to cancel said fluctuations, the delay time of said delay means being determined so that instantaneous phase fluctuations of the transmitted signals are timed with instantaneous fluctuated values of the difference at said second mixer, whereby the unknown sudden fluctuations included in the transmitted signals and usually not received simultaneously are simultaneously eliminated in the second mixer.

Claim 6

A system for eliminating unknown sudden phase- and frequency-fluctuations in transmitted telegraph signals including a reference signal which is separably by filter means, comprising: filter means for deriving the reference signal from said transmitted signals; generator means for generating a standard signal having a substantially stable phase-position and substantially stable frequency; detection means coupled to said filter means for detecting phase- and frequency-differences between said standard signal and said transmitted reference signal derived from said filter means, and for producing a voltage which varies in amplitude in proportion to said detected phase and frequency differences; delay means for delaying for a given delay time the transmitted signals; modulation means coupled to said delay means and said detection means for modulating the transmitted signals passed through the delay means in response to said variable voltage to cancel said fluctuations, whereby the unknown sudden fluctuations included in said transmItted signals and usually not received simultaneously are eliminated in said modulation means.

Claim 7

A system for eliminating unknown sudden phase- and frequency-fluctuations in transmitted telegraph signals including a reference signal which is separably by filter means, comprising: filter means for deriving the reference signal from said transmitted signals; generator means for generating a standard signal having a substantially stable phase-position and substantially stable frequency; detection means coupled to said filter means for detecting phase- and frequency-differences between said standard signal and said transmitted reference signal derived from said filter means, and for producing a voltage which varies in amplitude in proportion to said detected phase and frequency differences; delay means for delaying for a given delay time the transmitted signals; modulation means coupled to said delay means and said detection means for modulating the transmitted signals passed through the delay means in response to said variable voltage to cancel said fluctuations, whereby the unknown sudden fluctuations included in said transmItted signals and usually not received simultaneously are eliminated in said modulation means.

Claim 8

A system for eliminating undesired fluctuations in transmitted telegraph signals including a transmitted reference signal which is separable by filter means, comprising: equalizing means for equalizing respective transmission times of said transmitted signals; generator means having first and second outputs for producing stable signals at said respective outputs; first filter means coupled to said equalizing means for deriving said reference signal; first mixing means having first and second inputs and having an output, said first filter means being coupled to said first input of said first mixer means, and said first output of said generator means and said second input of said first mixer means being interconnected; a delay circuit having an input connected to said equalizing means, and having an output; second mixer means having first and second inputs and an output, and having said output of said delay circuit connected to said first input thereof, and having said second output of said generator means connected to said second input thereof; second and third filter means coupled respectively to said outputs of said first and second mixer means, third mixer means having an output, and having first and second inputs coupled respectively to said outputs of said second and third filter means; and an output filter coupled to the output of said third mixer means; wherein said third filter provides said telegraph signals as an output, said undesired fluctuations having been eliminated.

Claim 9

A system for eliminating undesired fluctuations in transmitted telegraph signals including a transmitted reference signal which is separable by filter means, comprising: equalizing means for equalizing respective transmission times of said transmitted signals; generator means having first and second outputs for producing stable signals at said respective outputs; first filter means coupled to said equalizing means for deriving said reference signal; first mixing means having first and second inputs and having an output, said first filter means being coupled to said first input of said first mixer means, and said first output of said generator means and said second input of said first mixer means being interconnected; a delay circuit having an input connected to said equalizing means, and having an output; second mixer means having first and second inputs and an output, and having said output of said delay circuit connected to said first input thereof, and having said second output of said generator means connected to said second input thereof; second and third filter means coupled respectively to said outputs of said first and second mixer means, third mixer means having an output, and having first and second inputs coupled respectively to said outputs of said second and third filter means; and an output filter coupled to the output of said third mixer means; wherein said third filter provides said telegraph signals as an output, said undesired fluctuations having been eliminated.