US4569028A — Adaptive digitizer circuit for information proces…

Claim 1

Independent Claim 102 words

An adaptive digitizer circuit for an information processing system comprising: an entropy filter, responsive to an information signal, V, having a variable noise, σ V , that is a function of V, for providing a transformed signal, T, having a constant transformed noise level, σ T , throughout its dynamic range; and an analog to digital converter responsive to the transformed signal from said entropy filter and in which the ratio, σ T /δ T , of the noise level, σ T , of the transformed signal and the digitization interval, δ T , is constant throughout the dynamic range of T.

Claim 2

Dependent Claim 102 words

An adaptive digitizer circuit for an information processing system comprising: an entropy filter, responsive to an information signal, V, having a variable noise, σ V , that is a function of V, for providing a transformed signal, T, having a constant transformed noise level, σ T , throughout its dynamic range; and an analog to digital converter responsive to the transformed signal from said entropy filter and in which the ratio, σ T /δ T , of the noise level, σ T , of the transformed signal and the digitization interval, δ T , is constant throughout the dynamic range of T.

Claim 3

Dependent Claim 49 words

The adaptive digitizer circuit of claim 1 further including an analog to digital converter in which the ratio, σ T /δ T , of the noise level, σ T , of the transformed signal and the digitization interval, δ T , is constant throughout the dynamic range of T.

Claim 4

Dependent Claim 16 words

The adaptive digitizer circuit of claim 1 in which said entropy filter provides the transform ##EQU29##

Claim 5

Dependent Claim 43 words

The adaptive digitizer circuit of claim 1 in which said variable noise level, σ V , includes constant electronic noise, σ e , and variable photon noise, σ.sub.γ, for providing a transformed signal having a constant transformed noise level throughout its dynamic range.

Claim 6

Dependent Claim 49 words

The adaptive digitizer circuit of claim 4 in which said entropy filter includes a first transform circuit having a first transform function T 1 from zero to the crossover of σ e and σ.sub.γ, and a second transform circuit having a second transform function T 2 above that crossover.

Claim 7

Dependent Claim 25 words

The adaptive digitizer circuit of claim 1 in which said first transform circuit includes amplifier means for providing at its output said first transform function.

Claim 8

Dependent Claim 34 words

The adaptive digitizer circuit of claim 6 in which said second transform circuit includes control circuit means for modifying the slope of the output of said amplifier means to provide said second transform function.

Claim 9

Dependent Claim 51 words

The adaptive digitizer circuit of claim 7 in which said amplifier means includes a number of amplifier stages and said control circuit includes a number of voltage sensitive conduction means for successively increasing their conduction and decreasing their associated amplifier stage output in response to increases in the information signal, V.

Claim 10

Dependent Claim 138 words

An adaptive digitizer circuit for an information processing system comprising: an entropy filter, responsive to an information signal, V, having a variable noise level, σ V , including constant electronic noise, σ e , and variable photon noise, σ.sub.γ, for providing a transformed signal having a constant transformed noise level throughout its dynamic range; said entropy filter including a first transform circuit having a first transform function T 1 from zero to the crossover of σ e and σ.sub.γ, and a second transform circuit having a second transform function T 2 above that crossover; and an analog to digital converter responsive to the transformed signal from said entropy filter and in which the ratio σ T /δ T of the noise level, σ T , of the transformed signal and the digitization interval, δ T , is constant.

Claim 11

Dependent Claim 138 words

An adaptive digitizer circuit for an information processing system comprising: an entropy filter, responsive to an information signal, V, having a variable noise level, σ V , including constant electronic noise, σ e , and variable photon noise, σ.sub.γ, for providing a transformed signal having a constant transformed noise level throughout its dynamic range; said entropy filter including a first transform circuit having a first transform function T 1 from zero to the crossover of σ e and σ.sub.γ, and a second transform circuit having a second transform function T 2 above that crossover; and an analog to digital converter responsive to the transformed signal from said entropy filter and in which the ratio σ T /δ T of the noise level, σ T , of the transformed signal and the digitization interval, δ T , is constant.

Claim 12

Dependent Claim 141 words

An adaptive digitizer circuit for an image processing system comprising: an entropy filter, responsive to an image signal, V, having a variable noise level, σ V , including constant electronic noise, σ e , and variable inherent noise, σ.sub.γ, for providing an output signal having a constant noise level throughout the dynamic range of the image signal; said entropy filter including a first transform circuit having a first transform function T 1 from zero to the crossover of σ e and σ.sub.γ, and a second transform circuit having a second transform function T 2 above that crossover; and an analog to digital converter responsive to the output signal from said entropy filter and in which the ratio σ T /δ T of the noise level, σ T , of the transformed signal and the digitization interval, δ T , is constant.

Claim 13

Dependent Claim 141 words

An adaptive digitizer circuit for an image processing system comprising: an entropy filter, responsive to an image signal, V, having a variable noise level, σ V , including constant electronic noise, σ e , and variable inherent noise, σ.sub.γ, for providing an output signal having a constant noise level throughout the dynamic range of the image signal; said entropy filter including a first transform circuit having a first transform function T 1 from zero to the crossover of σ e and σ.sub.γ, and a second transform circuit having a second transform function T 2 above that crossover; and an analog to digital converter responsive to the output signal from said entropy filter and in which the ratio σ T /δ T of the noise level, σ T , of the transformed signal and the digitization interval, δ T , is constant.

Claim 14

Dependent Claim 145 words

An adaptive digitizer circuit for an information processing system comprising: an entropy filter, responsive to an information signal, V, having a variable noise level, σ V , including constant electronic noise, σ e , and variable inherent noise, σ.sub.γ, for providing an output signal having a constant noise level throughout the dynamic range of the information signal; said entropy filter including a first transform circuit having a first transform function ##EQU30## and a slope of ηS/V FS from zero to the crossover of σ e and σ.sub.γ and a second transform circuit having a second transform function ##EQU31## above that crossover; and an analog to digital converter responsive to the output signal from said entropy filter and in which the ratio σ T /δ T of the noise level, σ T , of the transformed signal and the digitization interval, δ T , is constant.

Claim 15

Dependent Claim 145 words

An adaptive digitizer circuit for an information processing system comprising: an entropy filter, responsive to an information signal, V, having a variable noise level, σ V , including constant electronic noise, σ e , and variable inherent noise, σ.sub.γ, for providing an output signal having a constant noise level throughout the dynamic range of the information signal; said entropy filter including a first transform circuit having a first transform function ##EQU30## and a slope of ηS/V FS from zero to the crossover of σ e and σ.sub.γ and a second transform circuit having a second transform function ##EQU31## above that crossover; and an analog to digital converter responsive to the output signal from said entropy filter and in which the ratio σ T /δ T of the noise level, σ T , of the transformed signal and the digitization interval, δ T , is constant.

Claim 16

Dependent Claim 145 words

An adaptive digitizer circuit for an image processing system comprising: an entropy filter, responsive to an image signal, V, having a variable noise level, σ V , including constant electronic noise, σ e , and variable inherent noise, σ.sub.γ, for providing an output signal having a constant noise level throughout the dynamic range of the image signal; said entropy filter including a first transform circuit having a first transform function ##EQU32## and a slope of ηS/V FS from zero to the crossover of σ e and σ.sub.γ, and a second transform circuit having a second transform function ##EQU33## above that crossover; and an analog to digital converter responsive to the output signal from said entropy filter and in which the ratio σ T /δ T of the noise level, σ T , of the transformed signal and the digitization interval, δ T , is constant.

Claim 17

Dependent Claim 145 words

An adaptive digitizer circuit for an image processing system comprising: an entropy filter, responsive to an image signal, V, having a variable noise level, σ V , including constant electronic noise, σ e , and variable inherent noise, σ.sub.γ, for providing an output signal having a constant noise level throughout the dynamic range of the image signal; said entropy filter including a first transform circuit having a first transform function ##EQU32## and a slope of ηS/V FS from zero to the crossover of σ e and σ.sub.γ, and a second transform circuit having a second transform function ##EQU33## above that crossover; and an analog to digital converter responsive to the output signal from said entropy filter and in which the ratio σ T /δ T of the noise level, σ T , of the transformed signal and the digitization interval, δ T , is constant.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-02-03	1989-08-05	1990-02-04	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-02-03	1993-08-05	1994-02-04	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-02-03	1997-08-05	1998-02-04	$7700.00	Window Closed / Lapsed

Adaptive digitizer circuit for information processing system

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