US3668930A — Parameter read-out systems for pressure-frequency…

Claim 1

Independent Claim 117 words

In a system that includes a transducer responsive to pressure to produce an input signal having a frequency value that is variable with pressure, a read-out arrangement responsive to said input signal for producing read-out of a parameter having a nonlinear relationship to the frequency of the input signal, said arrangement including first means responsive to said input signal for generating a control signal having a value representative of the period corresponding to the frequency of said input signal, second means responsive to said control signal for producing an output signal having a value linearly related to the logarithmic value of said control signal, and third means utilizing said output signal for producing read-out of the parameter.

Claim 2

Dependent Claim 117 words

In a system that includes a transducer responsive to pressure to produce an input signal having a frequency value that is variable with pressure, a read-out arrangement responsive to said input signal for producing read-out of a parameter having a nonlinear relationship to the frequency of the input signal, said arrangement including first means responsive to said input signal for generating a control signal having a value representative of the period corresponding to the frequency of said input signal, second means responsive to said control signal for producing an output signal having a value linearly related to the logarithmic value of said control signal, and third means utilizing said output signal for producing read-out of the parameter.

Claim 3

Dependent Claim 42 words

In a system in accordance with claim 1 wherein said third means includes memory means responsive to said output signal to provide a memory corrected output signal, and means responsive to said memory corrected output signal for producing read-out of the parameter.

Claim 4

Dependent Claim 77 words

In a system in accordance with claim 1 wherein said transducer is responsive to atmospheric pressure, wherein said parameter is altitude, and wherein said second means produces said output signal having a value H given by the equation H A + B ln Tau where H is a variable approximately equal to altitude, ln Tau is the natural logarithm of said period corresponding to the frequency of said input signal, and A and B are predetermined constants.

Claim 5

Dependent Claim 44 words

In a system in accordance with claim 3 wherein said third means includes memory means responsive to said output signal to provide a memory corrected output signal representative of altitude, and means responsive to said memory corrected output signal for producing read-out of altitude.

Claim 6

Dependent Claim 88 words

In a system in accordance with claim 1 wherein the value of said control signal is M Tau where M is a scalar quantity and Tau is the period corresponding to the frequency of said input signal, wherein the value of said output signal is Kln (M Tau ) where K is a constant, and wherein said third means includes means for arithematically modifying said output signal to produce a modified output signal having a value equal to K + Kln(M Tau ), where K'' is a constant.

Claim 7

Dependent Claim 71 words

In a system in accordance with claim 5 wherein said transducer is responsive to atmospheric pressure, wherein said parameter is altitude, and wherein the scalar M and the constants K and K'' are such that the value of said modified output signal approximately equals altitude in accordance with the equation H A + Bln Tau where H is a variable that approximately equals altitude and A and B are predetermined constants.

Claim 8

Dependent Claim 32 words

In a system in accordance with claim 6 wherein said third means further includes memory means responsive to said modified output signal to provide a memory corrected output signal representative of altitude.

Claim 9

Dependent Claim 70 words

In a system in accordance with claim 5 wherein said parameter is pressure and wherein the scalar M and the constants K and K'' are such that the value of said modified output signal is approximately equal to the logarithmic value of pressure P in accordance with the equation lnP C - Dln Tau where P is a variable that approximately equals pressure and C and D are predetermined constants.

Claim 10

Dependent Claim 68 words

In a system in accordance with claim 8 wherein said third means further includes memory means responsive to said modified output signal to provide a memory corrected output signal representative of the natural logarithmic value of pressure. 10. In a system in accordance with claim 9 wherein said third means further includes means responsive to said memory corrected output signal to provide a final signal representative of pressure.

Claim 11

Dependent Claim 90 words

In an indicating system for indicating the value of a parameter that varies in accordance with pressure, the combination comprising a transducer responsive to pressure to produce an input signal having a frequency that is variable with pressure, means responsive to said input signal for producing an output signal having a value that is linearly related to the logarithmic value of the period of the frequency of said input signal, and utilization means responsive to said output signal for producing a final signal having a value representative of said parameter.

Claim 12

Dependent Claim 90 words

In an indicating system for indicating the value of a parameter that varies in accordance with pressure, the combination comprising a transducer responsive to pressure to produce an input signal having a frequency that is variable with pressure, means responsive to said input signal for producing an output signal having a value that is linearly related to the logarithmic value of the period of the frequency of said input signal, and utilization means responsive to said output signal for producing a final signal having a value representative of said parameter.

Claim 13

Dependent Claim 41 words

In an indicating system in accordance with claim 11 wherein said utilization means includes memory means for providing a memory corrected output signal in response to its input, and means responsive to said output signal for generating the memory means input.

Claim 14

Dependent Claim 82 words

In an indicating system in accordance with claim 11 wherein the output signal producing means includes means for providing a clock pulse train, gating means for gating said pulse train, and means for rendering said gating means operable to admit said pulse train for a time span that is linearly related to said logarithmic value of the period of the frequency of said input signal whereby the number of pulses of the admitted pulse train is linearly related to said logarithmic value.

Claim 15

Dependent Claim 35 words

In an indicating system in accordance with claim 13 wherein said means for rendering said gating means operable includes a rate multiplier and an accumulating counter connected to provide count feedback to said rate multiplier.

Claim 16

Dependent Claim 67 words

In an indicating system in accordance with claim 11 wherein the value of said output signal is Kln (M Tau ) where M is a scalar quantity and K is a constant, and wherein said utilization means includes means for arithematically modifying said output signal to produce a modified output signal having a value equal to K'' + Kln (M Tau ) where K'' is a constant.

Claim 17

Dependent Claim 65 words

In an indicating system in accordance with claim 15 wherein said parameter is altitude, and wherein the scalar M and the constants K and K'' are such that the value of said modified output signal approximately equals altitude H in accordance with the equation H A + Bln Tau where H is a variable that approximately equals altitude and A and B are predetermined constants.

Claim 18

Dependent Claim 32 words

In an indicating system in accordance with claim 16 wherein said utilization means includes memory means responsive to said modified output signal to provide a memory corrected output signal representative of altitude.

Claim 19

Dependent Claim 71 words

In an indicating system in accordance with claim 15 wherein said parameter is pressure and wherein the scalar M and the constants K and K'' are such that the value of said modified output signal is approximately equal to the logarithmic value of pressure in accordance with the equation ln P C - Dln Tau where P is a variable that approximately equals pressure and C and D are predetermined constants.

Claim 20

Dependent Claim 36 words

In an indicating system in accordance with claim 18 wherein said utilization means includes memory means responsive to said modified output signal to provide a memory corrected output signal representative of the logarithmic value of pressure.

Claim 21

Dependent Claim 27 words

In an indicating system in accordance with claim 19 wherein said utilization means further includes means responsive to said memory corrected signal to provide said final signal.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-06-13	1975-12-13	1976-06-13	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-06-13	1979-12-13	1980-06-13	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-06-13	1983-12-13	1984-06-13	$7700.00	Window Closed / Lapsed

Parameter read-out systems for pressure-frequency transducers

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