JP2009260438A - Adjusted value deriving apparatus, method, program, recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control the output power of a gain variable attenuator to become close to a desired value. <P>SOLUTION: The adjusted value deriving apparatus includes a gradient equivalent value recording portion, a first gradient equivalent value read-out portion 32a, a middle value deriving portion 32b, a second gradient equivalent value read-out portion 32c, and an adjusted value deriving portion 32e1. The gradient equivalent value recording portion associates the gradient of an approximation linear function showing the electric power P of the output signal of the gain variable attenuator with the value X of a control signal given to the gain variable attenuator and records them. The first gradient equivalent value read-out portion 32a reads out the first gradient corresponding to the initial value X1. Assuming that the approximation linear function indicates the initial electric power P1 when its gradient is the first gradient and the value X of the control signal is the initial value X1, the middle value deriving portion 32b derives a middle value X2, which in turn is the value of the control signal when the approximation linear function indicates the target electric power P0. The second gradient equivalent value read-out portion 32c reads out the second gradient corresponding to the middle value X2. The adjusted value deriving portion 32e1 derives the value of the control signal as an adjusted value Xf when the modified approximation function indicates the target electric power P0, wherein the modified approximation function is defined based on the first gradient, the second gradient, the initial value X1, and the initial power P1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to signal power adjustment.

  2. Description of the Related Art Conventionally, a device that amplifies a signal by a variable gain amplifier and outputs the signal, which has been subjected to peak detection, is processed using a digital circuit (see, for example, FIG. 1 of Patent Document 1 and summary). Devices that control the output power of a variable gain amplifier by controlling the gain of the variable gain amplifier based on the result are known.

Japanese Patent Laid-Open No. 11-154839

  Here, it is assumed that the output power of the variable gain amplifier is controlled on the assumption that the output power of the variable gain amplifier changes in proportion to the change in voltage applied to the variable gain amplifier.

  However, the change in the output power of the variable gain amplifier is not necessarily proportional to the change in the voltage applied to the variable gain amplifier. Therefore, controlling the output power of the variable gain amplifier based on the above assumption does not always work.

  Such a thing occurs not only in an amplifier but also in an attenuator (attenuator).

  Therefore, an object of the present invention is to control the power of the output of an instrument that outputs by changing the amplitude of the input so as to be close to a desired value.

  The correction value deriving device according to the present invention outputs an output signal by changing the amplitude of an input signal, and takes an initial value X1 in an amplitude changer in which the rate of change of the amplitude is controlled based on the value X of the control signal. Correction value derivation for deriving a correction value Xf that is a value of the control signal that brings the power of the output signal closer to the target power P0 than the initial power P1 that is the power of the output signal when the control signal is given A device corresponding to a slope corresponding to a slope of the approximate linear function when the power P of the output signal is expressed by an approximate linear function that is a linear function with the value X of the control signal as a variable. A slope equivalent value recording unit recorded in association with the signal value X and a first slope equivalent value corresponding to the initial value X1, which is the slope equivalent value of the approximate linear function, are read from the slope equivalent value recording unit. A first inclination equivalent value reading unit; It is a value corresponding to a slope equivalent value, and when the value X of the control signal is the initial value X1, the value of the control signal when the approximate linear function taking the target power P0 is the initial power P1. An intermediate value deriving unit for deriving an intermediate value X2 that is a value, and a second value corresponding to the intermediate value X2 and reading a second gradient equivalent value that is the gradient equivalent value of the approximate linear function from the gradient equivalent value recording unit An inclination equivalent value reading unit, and the electric power of the output signal defined by the value X of the control signal defined as a variable based on the first inclination equivalent value, the second inclination equivalent value, the initial value X1, and the initial power P1 A correction value deriving device including a correction value deriving unit that derives the value of the control signal when the correction approximate function representing P takes the target power P0 as the correction value Xf.

  The correction value deriving device according to the present invention outputs an output signal by changing the amplitude of an input signal, and takes an initial value X1 in an amplitude changer in which the rate of change of the amplitude is controlled based on the value X of the control signal. A correction value Xf that is a value of the control signal that brings the power of the output signal closer to the target power P0 is derived from the initial power P1 that is the power of the output signal when the control signal is given.

  The slope equivalent value recording unit represents the slope equivalent value corresponding to the slope of the approximate linear function when the power P of the output signal is expressed by an approximate linear function that is a linear function with the value X of the control signal as a variable. Records in association with the value X of the control signal. A first inclination equivalent value reading unit reads a first inclination equivalent value corresponding to the initial value X1, which is the inclination equivalent value of the approximate linear function, from the inclination equivalent value recording unit. The approximate linear function in which the intermediate value deriving unit has a slope corresponding to the first slope equivalent value and the value when the control signal value X is the initial value X1 is the initial power P1 An intermediate value X2, which is the value of the control signal when the target power P0 is taken, is derived. A second slope equivalent value reading unit reads a second slope equivalent value corresponding to the intermediate value X2, which is the slope equivalent value of the approximate linear function, from the slope equivalent value recording unit. A correction value deriving unit is defined based on the first slope equivalent value, the second slope equivalent value, the initial value X1, and the initial power P1, and uses the value X of the control signal as a variable as the power P of the output signal. Is derived as the corrected value Xf when the target power P0 is taken.

  In the correction value deriving device according to the present invention, the slope equivalent value is the slope of the approximate linear function or the reciprocal of the slope of the approximate linear function.

  In the correction value deriving device according to the present invention, the correction approximate function may be a linear function having a correction slope derived based on the first slope equivalent value and the second slope equivalent value.

  In the correction value deriving device according to the present invention, the correction inclination may be an average value of an inclination corresponding to the first inclination equivalent value and an inclination corresponding to the second inclination equivalent value.

  In the correction value deriving device according to the present invention, the correction inclination is an inverse of an average of an inverse of an inclination corresponding to the first inclination equivalent value and an inverse of an inclination corresponding to the second inclination equivalent value. It may be.

  In the modified value deriving device according to the present invention, the modified approximate function is a quadratic function, and the value when the value X of the control signal is the initial value X1 is the initial power P1, and the control The differential coefficient when the signal value X is the initial value X1 is a slope corresponding to the first slope equivalent value, and the differential coefficient when the control signal value X is the intermediate value X2 is the second slope. An inclination corresponding to an inclination equivalent value may be used.

  In the correction value deriving device according to the present invention, the inclination corresponding to the first inclination equivalent value is assumed to be inclination 1, the inclination equivalent to the second inclination equivalent value is assumed to be inclination 2, and corresponds to the nth inclination equivalent value. When the slope is the slope n (where n is an arbitrary integer greater than or equal to 3), N is an integer constant greater than or equal to 3, and the average value of slopes from slope 1 to slope n-1 is the temporary slope n, The value of the control signal when the approximate linear function takes the target power P0 when the slope is the temporary slope n and the value X when the control signal value X is the initial value X1 is the initial power P1 An additional intermediate value deriving unit for deriving the additional intermediate value Xn, and an nth inclination equivalent value corresponding to the additional intermediate value Xn, which is the inclination equivalent value of the approximate linear function, is read from the inclination equivalent value recording unit. An additional inclination equivalent value reading unit, and the correction inclination is from inclination 1 It may be derived based on the inclination to come N.

  In the correction value deriving device according to the present invention, the correction inclination may be an average value of inclinations from inclination 1 to inclination N.

  In the correction value deriving device according to the present invention, the correction inclination may be an average value of any two or more of inclinations from inclination 1 to inclination N.

  In the correction value deriving device according to the present invention, the inclination corresponding to the first inclination equivalent value is assumed to be inclination 1, the inclination equivalent to the second inclination equivalent value is assumed to be inclination 2, and corresponds to the nth inclination equivalent value. The slope is the slope n (where n is an arbitrary integer greater than or equal to 3), N is an integer constant greater than or equal to 3, the temporary slope 3 is the average value of the slope 1 and the slope 2, and the temporary slope m-1 and the slope When the average value with m−1 is a temporary slope m (where m is an arbitrary integer of 4 or more), the slope is the temporary slope n, and the value X of the control signal is the initial value X1. An additional intermediate value derivation unit for deriving an additional intermediate value Xn that is a value of the control signal when the approximate linear function when the value is the initial power P1 takes the target power P0, and the additional intermediate value Xn Corresponding nth inclination equivalent value, which is the inclination equivalent value of the approximate linear function, is stored in the inclination equivalent value recording unit. Comprising an additional inclination corresponding value reading section al reading, wherein the corrected slope, may be derived based on the temporary gradient N and tilt N.

  In the correction value deriving device according to the present invention, the correction inclination may be an average value of the temporary inclination N and the inclination N.

  In the correction value deriving device according to the present invention, the value X of the control signal may be a voltage.

  The present invention outputs the output signal by changing the amplitude of the input signal, and gives the control signal that takes the initial value X1 to the amplitude changer in which the change rate of the amplitude is controlled based on the value X of the control signal. A correction value derivation method for deriving a correction value Xf that is a value of the control signal that brings the power of the output signal closer to a target power P0 than the initial power P1 that is the power of the output signal when When the power P of the output signal is expressed by an approximate linear function that is a linear function with the value X of the control signal as a variable, a slope equivalent value corresponding to the slope of the approximate linear function corresponds to the value X of the control signal. The slope equivalent value recording step recorded and the first slope corresponding to the initial value X1 and reading the first slope equivalent value that is the slope equivalent value of the approximate linear function from the recorded content of the slope equivalent value recording step Equivalent value reading step and the slope is the first slope A value corresponding to this value, and the value of the control signal when the approximate linear function having the initial power P1 is the initial power P1 when the value X of the control signal is the initial value X1 is the target power P0. An intermediate value deriving step for deriving the intermediate value X2, and a second gradient equivalent value corresponding to the intermediate value X2, which is the gradient equivalent value of the approximate linear function, is read from the recorded content of the gradient equivalent value recording step A second inclination equivalent value reading step; and the output signal using the value X of the control signal defined as a variable based on the first inclination equivalent value, the second inclination equivalent value, the initial value X1, and the initial power P1. A correction value deriving method including a correction value deriving step of deriving the value of the control signal when the target power P0 is taken as the correction value Xf.

  The present invention outputs the output signal by changing the amplitude of the input signal, and gives the control signal that takes the initial value X1 to the amplitude changer in which the change rate of the amplitude is controlled based on the value X of the control signal. Causing the computer to execute a correction value derivation process for deriving a correction value Xf that is a value of the control signal that brings the power of the output signal closer to the target power P0 than the initial power P1 that is the power of the output signal at the time The correction value deriving process is a slope of the approximate linear function when the power P of the output signal is expressed by an approximate linear function that is a linear function with the value X of the control signal as a variable. A slope equivalent value recording step in which the slope equivalent value corresponding to the control signal value X is recorded, and a first slope equivalent value corresponding to the initial value X1 and corresponding to the slope of the approximate linear function. Of the slope equivalent value recording step A first inclination equivalent value reading step of reading from the recorded contents, and a value when the inclination is a value corresponding to the first inclination equivalent value and the value X of the control signal is the initial value X1 is the initial power P1 An intermediate value deriving step of deriving an intermediate value X2 that is a value of the control signal when the approximate linear function takes the target power P0, and the slope equivalent value of the approximate linear function corresponding to the intermediate value X2 A second inclination equivalent value reading step of reading out the second inclination equivalent value from the recorded content of the inclination equivalent value recording step, the first inclination equivalent value, the second inclination equivalent value, the initial value X1, and the initial power. A modified approximation function that represents the power P of the output signal defined by P1 as a variable and derives the value of the control signal as the modified value Xf when the target power P0 is taken. Correction value deriving process It is.

  The present invention outputs the output signal by changing the amplitude of the input signal, and gives the control signal that takes the initial value X1 to the amplitude changer in which the change rate of the amplitude is controlled based on the value X of the control signal. Causing the computer to execute a correction value derivation process for deriving a correction value Xf that is a value of the control signal that brings the power of the output signal closer to the target power P0 than the initial power P1 that is the power of the output signal at the time The correction value derivation process represents the power P of the output signal as an approximate linear function that is a linear function with the value X of the control signal as a variable. A slope equivalent value recording step in which a slope equivalent value corresponding to the slope of the approximate linear function is recorded in association with the value X of the control signal, and the approximation linear function corresponding to the initial value X1. Inclination A first inclination equivalent value reading step of reading the first inclination equivalent value, which is the equivalent value, from the recorded content of the inclination equivalent value recording step, the inclination is a value corresponding to the first inclination equivalent value, and the value of the control signal An intermediate value deriving step of deriving an intermediate value X2 that is a value of the control signal when the approximate linear function where the value when X is the initial value X1 is the initial power P1 takes the target power P0; A second inclination equivalent value reading step for reading a second inclination equivalent value corresponding to the intermediate value X2 from the recorded content of the inclination equivalent value recording step, and a second inclination equivalent value reading step corresponding to the first linear inclination A modified approximate function that represents the power P of the output signal using the value X of the control signal as a variable, defined based on the value, the second slope equivalent value, the initial value X1, and the initial power P1, the target power P0 The value of the control signal when taking A recording medium that includes a correction value derivation step of deriving as Xf.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an output control system 1 according to an embodiment of the present invention. The output control system 1 includes a variable gain attenuator (amplitude changer) 2, an A / D converter 4, a D / A converter 6, a target power input unit 10, a switch 11, an initial value recording unit 21, and an initial voltage setting unit. 22, a correction value deriving device 30 and a power measuring unit 42 are provided.

  The variable gain attenuator (amplitude changer) 2 receives an analog input signal (for example, an AC voltage), changes its amplitude, and outputs an analog output signal. Note that the rate of change in the amplitude of the variable gain attenuator 2 (= the amplitude of the output signal / the amplitude of the input signal) is controlled based on the value X (voltage) of the control signal applied to the variable gain attenuator 2. Since the variable gain attenuator 2 is an attenuator, the rate of change <1.

  Although the variable gain attenuator 2 is used in the embodiment of the present invention, a variable gain amplifier (change rate> 1) may be used.

  The A / D converter 4 receives the output signal from the variable gain attenuator 2, digitizes it, and provides it to the power measuring unit 42.

  The D / A converter 6 receives the control signal from the switch 11, digitizes it, and gives it to the variable gain attenuator 2.

  The target power input unit 10 is for inputting a target power P0 that is a target value of the power of the output signal.

  The switch 11 is either (a) a state in which the output of the initial voltage setting unit 22 is supplied to the D / A converter 6 (see FIG. 4), or (b) an output of the correction value deriving device 30 is 6 is realized (see FIG. 5).

  The initial value recording unit 21 records the value X (voltage) of the control signal in association with the target power P0.

  The initial voltage setting unit 22 receives the target power P0 from the target power input unit 10, reads the value X (voltage) of the control signal corresponding to the target power P0 from the initial value recording unit 21, and outputs it. This output is the initial value X1.

  FIG. 2 is a graph showing a power characteristic F when an input signal having a predetermined power is given to the variable gain attenuator 2.

  The power characteristic F is obtained by taking the value X (voltage) of the control signal on the horizontal axis and the power P of the output signal on the vertical axis. Ideally, the power P1 (referred to as initial power) of the output signal when the control signal having the initial value X1 is given to the variable gain attenuator 2 matches the target power P0. However, the initial power P1 does not necessarily match the target power P0.

  Therefore, the value of the control signal is corrected to the correction value Xf so that the power of the output signal is closer to the target power P0 than the initial power P1.

  The correction value deriving device 30 is for deriving the correction value Xf, and includes a slope equivalent value recording unit 31 and a correction voltage setting unit 32.

  The slope equivalent value recording unit 31 represents a slope equivalent value corresponding to the slope of the approximate linear function when the power P of the output signal is expressed by an approximate linear function that is a linear function with the value X of the control signal as a variable. Record in association with the value X of.

  The slope equivalent value is, for example, the slope of the approximate linear function or the reciprocal of the slope of the approximate linear function. The slope of the approximate linear function can be considered as the slope of the tangent line of the power characteristic F, for example. Referring to FIG. 2, at coordinates (X1, P1), an approximate linear function f1 represents the power P of the output signal. Therefore, the slope equivalent value recording unit 31 records a slope equivalent value corresponding to the slope of the approximate linear function f1 (referred to as slope 1) in association with the initial value X1.

  The output of the correction voltage setting unit 32 becomes the output of the correction value deriving device 30 and is given to the switch 11. The configuration of the correction voltage setting unit 32 will be described later.

  The power measuring unit 42 receives the digitized output signal from the A / D converter 4, measures the power, and supplies it to the corrected voltage setting unit 32 of the corrected value deriving device 30.

  The configuration of the correction voltage setting unit 32 is different in each embodiment.

First Embodiment FIG. 3 is a block diagram showing a configuration of a correction voltage setting unit 32 according to the first embodiment. The corrected voltage setting unit 32 includes a first gradient equivalent value reading unit 32a, a first intermediate voltage deriving unit (intermediate value deriving unit) 32b, a second gradient equivalent value reading unit 32c, a corrected gradient deriving unit 32d1, and a corrected voltage deriving unit ( A correction value deriving unit) 32e1.

  For example, the inclination of the approximate linear function is recorded in the inclination equivalent value recording unit 31.

  First inclination equivalent value reading unit 32 a receives initial value X 1 from initial voltage setting unit 22. Further, the first inclination equivalent value reading unit 32 a outputs, from the inclination equivalent value recording unit 31, a first inclination equivalent value corresponding to the inclination (inclination 1) of the approximate linear function f 1 corresponding to the initial value X 1. read out. For example, the first inclination equivalent value reading unit 32 a reads the inclination 1 from the inclination equivalent value recording unit 31.

  The first intermediate voltage deriving unit (intermediate value deriving unit) 32b receives the gradient 1 from the first gradient equivalent value reading unit 32a, the target power P0 from the target power input unit 10, and the initial power P1 from the power measurement unit 42. The initial value X 1 is received from the initial voltage setting unit 22.

  Further, the first intermediate voltage deriving unit (intermediate value deriving unit) 32b is a value corresponding to the first inclination equivalent value, and the value when the control signal value X is the initial value X1 is the initial power P1. An intermediate value X2, which is the value of the control signal when a certain approximate linear function takes the target power P0, is derived.

That is, the first intermediate voltage deriving unit 32b approximates the linear function f1 (the slope is the slope 1 and the coordinates (X1,
P1)), the value of the control signal (intermediate value X2) when the target power P0 is taken is derived (see FIG. 2).

  The intermediate value X2 can be derived using the following equation (1).

X2 = X1 + (P0−P1) / Slope 1 (1)
The second inclination equivalent value reading unit 32c receives the intermediate value X2 from the first intermediate voltage deriving unit 32b. Furthermore, the second inclination equivalent value reading unit 32 c reads out from the inclination equivalent value recording unit 31 the second inclination equivalent value corresponding to the intermediate value X2, which is the inclination equivalent value of the approximate linear function.

  Referring to FIG. 2, the power of the output signal when the control signal having intermediate value X2 is given to variable gain attenuator 2 is P2. In the coordinates (X2, P2), the approximate linear function f2 (passes the coordinates (X2, P2)) represents the power P of the output signal. Therefore, the slope equivalent value recording unit 31 records a slope equivalent value corresponding to the slope of the approximate linear function f2 (referred to as slope 2) in association with the intermediate value X2.

  Therefore, for example, the second inclination equivalent value reading unit 32 c reads the inclination 2 from the inclination equivalent value recording unit 31.

  Further, with reference to FIG. 2, a modified approximate function f representing the power P of the output signal with the value X of the control signal as a variable is considered. Here, it is assumed that the corrected approximate function f is a linear function having a corrected gradient derived based on a first gradient equivalent value (for example, gradient 1) and a second gradient equivalent value (for example, gradient 2). For example, it is assumed that the corrected inclination is an average value of the inclination 1 corresponding to the first inclination equivalent value and the inclination 2 corresponding to the second inclination equivalent value. That is, the corrected inclination can be derived using the following equation (2).

Corrected slope = (Slope 1 + Slope 2) / 2 (2)
Further, it is assumed that the modified approximate function f passes through the coordinates (X1, P1).

  Then, the modified approximate function P = f (X) is expressed by the following equation based on the first slope equivalent value (eg, slope 1), the second slope equivalent value (eg, slope 2), the initial value X1, and the initial power P1. It is defined as (3).

P = f (X) = (corrected slope) x X-(corrected slope) x X1 + P1 (3)
The corrected inclination deriving unit 32d1 receives the inclination 1 from the first inclination equivalent value reading unit 32a, and receives the inclination 2 from the second inclination equivalent value reading unit 32c. Further, the corrected inclination deriving unit 32d1 derives the corrected inclination based on the above equation (2).

  The corrected voltage deriving unit (corrected value deriving unit) 32e1 derives the value of the control signal when the modified approximate function f takes the target power P0 as the modified value Xf. The value of X when the target power P0 is substituted for P in Equation (3) is the correction value Xf. Therefore, the correction value Xf can be derived using the following equation (4).

Xf = X1 + (P0−P1) / (corrected slope) (4)
With reference to FIG. 2, the power of the output signal when the control signal of the correction value Xf is given to the variable gain attenuator 2 is Pf. The power Pf is closer to the target power P0 than the initial power P1.

  Next, the operation of the first embodiment will be described.

  FIG. 4 is a diagram for explaining the operation of the output control system 1 when a control signal having an initial value X1 is given to the variable gain attenuator 2.

  First, the target power input unit 10 supplies the target power P0, which is the target value of the power of the output signal, to the initial voltage setting unit 22. The initial voltage setting unit 22 reads an initial value X1 corresponding to the target power P0 and outputs a control signal having a voltage of the initial value X1. The control signal output from the initial voltage setting unit 22 is given to the D / A converter 6 via the switch 11. The D / A converter 6 digitizes the control signal and gives it to the variable gain attenuator 2. When the control signal (initial value X1) is given to the variable gain attenuator 2, referring to FIG. 2, the power of the output signal output from the variable gain attenuator 2 becomes the initial power P1.

  FIG. 5 is a diagram for explaining the operation of the output control system 1 when the correction value Xf is derived.

  The power of the output signal output from the variable gain attenuator 2 is the initial power P1. The power measuring unit 42 receives the digitized output signal from the A / D converter 4 and measures the power to obtain the initial power P1. The measurement result (initial power P1) is given to the correction voltage setting unit 32 of the correction value deriving device 30.

  In addition, the initial voltage setting unit 22 supplies the initial value X1 and the target power input unit 10 supplies the target power P0 to the correction voltage setting unit 32.

  Based on the initial value X1, the first gradient equivalent value reading unit 32a reads the gradient 1 and supplies it to the first intermediate voltage deriving unit 32b. The first intermediate voltage deriving unit 32b derives the intermediate value X2 based on the target power P0, the initial power P1, the slope 1, and the initial value X1 (see Expression (1)).

  Based on the intermediate value X2, the second inclination equivalent value reading unit 32c reads the inclination 2.

  The corrected inclination deriving unit 32d1 takes the average of the inclination 1 and the inclination 2 (see equation (2)) to obtain the corrected inclination.

  The corrected voltage deriving unit 32e1 derives a corrected value Xf based on the target power P0, the initial power P1, the corrected slope, and the initial value X1 (see Expression (4)).

  The power Pf is closer to the target power P0 than the initial power P1.

  According to the first embodiment, the output power of the variable gain attenuator (amplitude changer) 2 can be controlled to be closer to the target power P0 than the initial power P1.

  Moreover, the power Pf is closer to the target power P0 than the power P2. This simply means that the output power can be made closer to the target power P0 than when the approximate linear function f1 is used.

Second Embodiment The second embodiment is an embodiment suitable when the reciprocal of the slope of the approximate linear function is recorded in the slope equivalent value recording unit 31.

  In the inclination equivalent value recording unit 31, for example, the reciprocal of the inclination of the approximate linear function is recorded.

  FIG. 6 is a block diagram illustrating a configuration of the correction voltage setting unit 32 according to the second embodiment. The corrected voltage setting unit 32 includes a first gradient equivalent value reading unit 32a, a first intermediate voltage deriving unit (intermediate value deriving unit) 32b, a second gradient equivalent value reading unit 32c, a corrected gradient deriving unit 32d2, and a corrected voltage deriving unit ( A correction value deriving unit) 32e2.

  The first gradient equivalent value reading unit 32a, the first intermediate voltage deriving unit (intermediate value deriving unit) 32b, and the second gradient equivalent value reading unit 32c are the same as those in the first embodiment, and a description thereof will be omitted.

  However, the first inclination equivalent value reading unit 32a and the second inclination equivalent value reading unit 32c are respectively reciprocals (1 / inclination 1, 1 / inclination 2) of the inclinations (inclination 1 and inclination 2) of the approximate linear functions f1 and f2. ).

  The modified approximate function f is the same as that in the first embodiment. However, the correction inclination is different from that of the first embodiment.

  The corrected inclination deriving unit 32d2 corrects the reciprocal of the average value of the reciprocal of the inclination corresponding to the first inclination equivalent value (1 / inclination 1) and the inverse of the inclination corresponding to the second inclination equivalent value (1 / inclination 2). Derived as slope. That is, the corrected inclination deriving unit 32d2 derives the corrected inclination as shown in the following equation (5).

Corrected slope = 1 / ((1 / Slope 1 + 1 / Slope 2) / 2) (5)
However, the corrected inclination deriving unit 32d2 may output 1 / (corrected inclination).

  The corrected voltage deriving unit (corrected value deriving unit) 32e2 is the same as that of the first embodiment. However, the correction inclination or 1 / (correction inclination) is received from the correction inclination derivation unit 32d2.

  The correction voltage deriving unit 32e2 can derive the correction value Xf using the above equation (4).

  The operation of the second embodiment is almost the same as that of the first embodiment.

  However, the first inclination equivalent value reading unit 32a and the second inclination equivalent value reading unit 32c are respectively reciprocals (1 / inclination 1, 1 / inclination 2) of the inclinations (inclination 1 and inclination 2) of the approximate linear functions f1 and f2. ). The corrected inclination deriving unit 32d2 derives the corrected inclination (or 1 / (corrected inclination)) using the above equation (5). The corrected voltage deriving unit 32e2 receives the corrected inclination or 1 / (corrected inclination) from the corrected inclination deriving unit 32d2.

  According to the second embodiment, there are the same effects as the first embodiment. Moreover, even if the slope equivalent value recording unit 31 records the reciprocal of the slope of the approximate linear function, it is stored in the approximate linear function in the first slope equivalent value reading unit 32a and the second slope equivalent value reading unit 32c. Therefore, the labor of calculation can be reduced.

Third Embodiment In the third embodiment, the modified approximate function f is a quadratic function.

  For example, the inclination of the approximate linear function is recorded in the inclination equivalent value recording unit 31.

  FIG. 7 is a block diagram illustrating a configuration of the correction voltage setting unit 32 according to the third embodiment. The corrected voltage setting unit 32 includes a first gradient equivalent value reading unit 32a, a first intermediate voltage deriving unit (intermediate value deriving unit) 32b, a second gradient equivalent value reading unit 32c, a modified approximate function deriving unit 32t, and a corrected voltage deriving unit. (Correction value deriving unit) 32e3 is provided.

  The first gradient equivalent value reading unit 32a, the first intermediate voltage deriving unit (intermediate value deriving unit) 32b, and the second gradient equivalent value reading unit 32c are the same as those in the first embodiment, and the description thereof is omitted.

  The modified approximate function deriving unit 32t converts the modified approximate function f, which is a quadratic function, into a first gradient equivalent value (for example, gradient 1), a second gradient equivalent value (for example, gradient 2), an intermediate value X2, and an initial value X1. And derived based on the initial power P1. The modified approximate function deriving unit 32t receives the first inclination equivalent value from the first inclination equivalent value reading unit 32a, receives the second inclination equivalent value from the second inclination equivalent value reading unit 32c, and receives the intermediate value X2 as the first value. Received from the intermediate voltage deriving unit 32b, the initial power P1 from the power measuring unit 42, and the initial value X1 from the initial voltage setting unit 22.

  FIG. 8 is a graph showing a modified approximate function f that is a quadratic function. However, the power characteristic F is not shown in FIG.

The modified approximate function f is a quadratic function (P = f (X) = aX ² + bX + c) that satisfies the following condition.

  First, the value when the value X of the control signal is the initial value X1 is the initial power P1. That is, the modified approximate function f passes through the coordinates (X1, P1).

  Further, the differential coefficient when the value X of the control signal is the initial value X1 is a slope (slope 1) corresponding to the first slope equivalent value. The differential coefficient of f (X) is 2aX + b. Therefore, 2aX1 + b means that the inclination is equal to 1.

  Moreover, the differential coefficient when the value X of the control signal is the intermediate value X2 is a slope (slope 2) corresponding to the second slope equivalent value. That is, 2aX2 + b is equal to the slope 2.

2aX1 + b = slope 1 (6)
2aX2 + b = slope 2 (7)
From the above equations (6) and (7), a and b can be obtained (X1, X2, slope 1, and slope 2 are known). Moreover, aX1 ² + bX1 + c = P1. Since P1, X1, a, and b are known, c can be obtained.

  The corrected voltage deriving unit (corrected value deriving unit) 32e3 derives the value of the control signal when the corrected approximate function f takes the target power P0 as the corrected value Xf. That is, a correction value Xf that satisfies the following equation (8) is derived.

P0 = f (Xf) = aXf ² + bXf + c (8)
However, there are often two correction values Xf that satisfy equation (8). In this case, it is determined that the smaller one of the two is set as the correction value Xf.

  The operation of the third embodiment is substantially the same as that of the first embodiment.

  However, the modified approximate function deriving unit 32t receives the first inclination equivalent value from the first inclination equivalent value reading unit 32a, receives the second inclination equivalent value from the second inclination equivalent value reading unit 32c, and receives the intermediate value X2 as the first value. Received from the intermediate voltage deriving unit 32b, the initial power P1 from the power measuring unit 42, and the initial value X1 from the initial voltage setting unit 22. Further, the modified approximate function deriving unit 32t derives a modified approximate function f (see FIG. 8) that is a quadratic function.

  The corrected voltage deriving unit (corrected value deriving unit) 32e3 derives the value of the control signal when the corrected approximate function f takes the target power P0 as the corrected value Xf (see Expression 8).

  According to the third embodiment, the same effects as in the first embodiment can be obtained.

Fourth Embodiment The fourth embodiment is the same as the first embodiment except that an average unit 32f, a second intermediate voltage deriving unit (additional intermediate value deriving unit) 32g, and a third inclination equivalent value reading unit (additional inclination equivalent value). A reading unit) 32h is added.

  FIG. 9 is a block diagram showing a configuration of the correction voltage setting unit 32 according to the fourth embodiment. The corrected voltage setting unit 32 includes a first gradient equivalent value reading unit 32a, a first intermediate voltage deriving unit (intermediate value deriving unit) 32b, a second gradient equivalent value reading unit 32c, a corrected gradient deriving unit 32d4, and a corrected voltage deriving unit ( A correction value deriving unit) 32e4, an average unit 32f, a second intermediate voltage deriving unit (additional intermediate value deriving unit) 32g, and a third gradient equivalent value reading unit (additional gradient equivalent value reading unit) 32h.

  For example, the inclination of the approximate linear function is recorded in the inclination equivalent value recording unit 31.

  The first gradient equivalent value reading unit 32a, the first intermediate voltage deriving unit (intermediate value deriving unit) 32b, and the second gradient equivalent value reading unit 32c are the same as those in the first embodiment, and the description thereof is omitted.

  FIG. 10 is a graph showing the modified approximate function f used in the fourth embodiment. Referring to FIG. 10, the corrected approximate function f is a linear function, and its slope is a corrected slope.

  As in the first embodiment, the slope 1 is a slope corresponding to the first slope equivalent value, and the slope 2 is a slope corresponding to the second slope equivalent value.

  Here, an inclination corresponding to the nth inclination equivalent value is assumed to be an inclination n (where n is an arbitrary integer of 3 or more). Further, an average value of the slopes from the slope 1 to the slope n−1 is defined as a temporary slope n. For example, the temporary inclination 3 is an average of inclinations from inclination 1 to inclination 2, that is, an average of inclination 1 and inclination 2. The provisional inclination 4 is an average of inclinations from inclination 1 to inclination 3, that is, an average of inclination 1, inclination 2, and inclination 3.

  Here, the value of the control signal when the approximate linear function having the initial power P1 when the slope is the temporary slope n and the value X of the control signal is the initial value X1 takes the target power P0 is added Let it be the value Xn. For example, the X coordinate where the inclination is the provisional inclination 3 and the approximate linear function passing through the coordinates (X1, P1) becomes the target power P0 is the additional intermediate value X3. The X coordinate where the inclination is the provisional inclination 4 and the approximate linear function passing through the coordinates (X1, P1) becomes the target power P0 is the additional intermediate value X4.

  Furthermore, the slope equivalent value of the approximate linear function corresponding to the additional intermediate value Xn is referred to as an nth slope equivalent value. For example, the slope equivalent value of the approximate linear function corresponding to the additional intermediate value X3 is referred to as a third slope equivalent value. The slope equivalent value of the approximate linear function corresponding to the additional intermediate value X4 is referred to as a fourth slope equivalent value.

  The correction slope of the correction approximation function f used in the fourth embodiment is derived based on the slope from the slope 1 to the slope N (where N is an integer constant equal to or greater than 3). The corrected inclination is, for example, an average value of inclinations from inclination 1 to inclination N. If N is 3, it is the average value of gradients from gradient 1 to gradient 3, that is, the average value of gradient 1, gradient 2 and gradient 3. If N is 4, it is the average value of gradients from gradient 1 to gradient 4, that is, the average value of gradient 1, gradient 2, gradient 3 and gradient 4.

  However, the corrected inclination may be, for example, an average value of any two or more of inclinations from inclination 1 to inclination N. For example, if N is 4, an average value of any of the inclinations 1 to 4 (for example, inclination 2, inclination 3, and inclination 4), that is, an average value of inclination 2, inclination 3, and inclination 4 may be used. .

  In FIG. 10, the corrected approximate function f when the corrected inclination is an average value of the inclination 1, the inclination 2, and the inclination 3 is illustrated.

  FIG. 9 illustrates the configuration of the correction voltage setting unit 32 when the correction value Xf is derived using the inclination 1, the inclination 2, and the inclination 3.

  The averaging unit 32f receives the inclination 1 from the first inclination equivalent value reading unit 32a, receives the inclination 2 from the second inclination equivalent value reading unit 32c, and takes the average of the inclination 1 and the inclination 2. As described above, the average of the inclination 1 and the inclination 2 is the temporary inclination 3.

  The second intermediate voltage deriving unit (additional intermediate value deriving unit) 32g has an approximate linear function whose initial power P1 is the target power when the slope is the temporary slope n and the value X of the control signal is the initial value X1. An additional intermediate value Xn, which is the value of the control signal when taking P0, is derived. However, in FIG. 9, n = 3. Therefore, the second intermediate voltage deriving unit 32g derives the additional intermediate value X3 that is the value of the control signal when the approximate linear function passing through the coordinates (X1, P1) has the provisional inclination 3 and takes the target power P0. To do. The second intermediate voltage deriving unit 32g receives the temporary slope 3 from the average unit 32f, receives the target power P0 from the target power input unit 10, receives the initial power P1 from the power measurement unit 42, and receives the initial value X1 as the initial voltage. Received from the setting unit 22.

  The additional intermediate value Xn can be derived using the following equation (9).

Xn = X1 + (P0−P1) / provisional slope n (9)
Therefore, the second intermediate voltage deriving unit 32g can derive the additional intermediate value X3 as X1 + (P0−P1) / provisional inclination 3.

  The third slope equivalent value reading unit (additional slope equivalent value reading unit) 32 h reads the nth slope equivalent value, which is the slope equivalent value of the approximate linear function, corresponding to the additional intermediate value Xn from the slope equivalent value recording unit 31. However, in FIG. 9, n = 3. Therefore, the third inclination equivalent value reading unit 32h reads the third inclination equivalent value corresponding to the additional intermediate value X3, which is the inclination equivalent value of the approximate linear function, from the inclination equivalent value recording unit 31.

  Referring to FIG. 10, the power of the output signal when the control signal having the additional intermediate value X3 is given to variable gain attenuator 2 is P3. At the coordinates (X3, P3), the approximate linear function f3 (passes through the coordinates (X3, P3)) represents the power P of the output signal. Therefore, the slope equivalent value recording unit 31 records a slope equivalent value corresponding to the slope of the approximate linear function f3 (referred to as slope 3) in association with the additional intermediate value X3.

  Therefore, for example, the third inclination equivalent value reading unit 32 h reads the inclination 3 from the inclination equivalent value recording unit 31.

  The corrected inclination deriving unit 32d4 receives the inclination 1 from the first inclination equivalent value reading unit 32a, the inclination 2 from the second inclination equivalent value reading unit 32c, and the inclination 3 from the third inclination equivalent value reading unit 32h. Further, the corrected inclination deriving unit 32d4 derives the corrected inclination as an average value of the inclination 1, the inclination 2, and the inclination 3.

  The corrected voltage deriving unit (corrected value deriving unit) 32e4 derives the value of the control signal when the corrected approximate function takes the target power P0 as the corrected value Xf. The correction value Xf can be derived using the above equation (4). However, the correction voltage deriving unit 32e4 receives the correction inclination from the correction inclination deriving unit 32d4.

  Next, the operation of the fourth embodiment will be described.

  The operation of the output control system 1 when the control signal having the initial value X1 is given to the variable gain attenuator 2 is the same as that of the first embodiment, and the description thereof is omitted (see FIG. 4).

  When a control signal having an initial value X1 is given to the variable gain attenuator 2, the power of the output signal output from the variable gain attenuator 2 becomes the initial power P1. The power measuring unit 42 receives the digitized output signal from the A / D converter 4 and measures the power to obtain the initial power P1. The measurement result (initial power P1) is given to the correction voltage setting unit 32 of the correction value deriving device 30.

  In addition, the initial voltage setting unit 22 supplies the initial value X1 and the target power input unit 10 supplies the target power P0 to the correction voltage setting unit 32.

  Based on the initial value X1, the first gradient equivalent value reading unit 32a reads the gradient 1 and supplies it to the first intermediate voltage deriving unit 32b. The first intermediate voltage deriving unit 32b derives the intermediate value X2 based on the target power P0, the initial power P1, the slope 1, and the initial value X1 (see Expression (1)).

  Based on the intermediate value X2, the second inclination equivalent value reading unit 32c reads the inclination 2.

  The average unit 32f takes the average of the inclination 1 and the inclination 2 (provisional inclination 3).

  The second intermediate voltage deriving unit 32g derives an additional intermediate value X3 that is the value of the control signal when the approximate linear function passing through the coordinates (X1, P1) has the provisional inclination 3 and takes the target power P0 ( (Refer Formula (9)).

  The third inclination equivalent value reading unit 32h reads the inclination 3 based on the additional intermediate value X3.

  The corrected inclination deriving unit 32d4 derives the corrected inclination as an average value of the inclination 1, the inclination 2, and the inclination 3.

  The correction voltage deriving unit 32e4 receives the correction gradient from the correction gradient deriving unit 32d4, and derives the correction value Xf using the above-described equation (4).

  According to 4th embodiment, there exists an effect similar to 1st embodiment.

Fifth Embodiment The fifth embodiment is the same as the first embodiment except that the average units 32m1, 32m2, the second intermediate voltage deriving unit (additional intermediate value deriving unit) 32n1, and the third intermediate voltage deriving unit (additional intermediate value). A derivation unit 32n2, a third inclination equivalent value reading unit (additional inclination equivalent value reading unit) 32p1, and a fourth inclination equivalent value reading unit (additional inclination equivalent value reading unit) 32p2 are added.

  FIG. 11 is a block diagram illustrating a configuration of the correction voltage setting unit 32 according to the fifth embodiment. The corrected voltage setting unit 32 includes a first gradient equivalent value reading unit 32a, a first intermediate voltage deriving unit (intermediate value deriving unit) 32b, a second gradient equivalent value reading unit 32c, a corrected gradient deriving unit 32d5, and a corrected voltage deriving unit ( Correction value deriving unit) 32e5, averaging units 32m1, 32m2, second intermediate voltage deriving unit (additional intermediate value deriving unit) 32n1, third intermediate voltage deriving unit (additional intermediate value deriving unit) 32n2, third inclination equivalent value reading unit (Additional inclination equivalent value reading unit) 32p1 and a fourth inclination equivalent value reading unit (additional inclination equivalent value reading unit) 32p2.

  For example, the inclination of the approximate linear function is recorded in the inclination equivalent value recording unit 31.

  The first gradient equivalent value reading unit 32a, the first intermediate voltage deriving unit (intermediate value deriving unit) 32b, and the second gradient equivalent value reading unit 32c are the same as those in the first embodiment, and the description thereof is omitted.

  As in the first embodiment, the slope 1 is a slope corresponding to the first slope equivalent value, and the slope 2 is a slope corresponding to the second slope equivalent value.

  Here, an inclination corresponding to the nth inclination equivalent value is assumed to be an inclination n (where n is an arbitrary integer of 3 or more).

  Further, the temporary inclination 3 is an average value of the inclination 1 and the inclination 2. An average value of the temporary inclination m-1 and the inclination m-1 is defined as a temporary inclination m (where m is an arbitrary integer of 4 or more). For example, the temporary inclination 3 is an average value of the temporary inclination 2 and the inclination 2. The temporary inclination 4 is an average value of the temporary inclination 3 and the inclination 3.

  Here, the value of the control signal when the approximate linear function having the initial power P1 when the slope is the temporary slope n and the value X of the control signal is the initial value X1 takes the target power P0 is added Let it be the value Xn. For example, the X coordinate where the inclination is the provisional inclination 3 and the approximate linear function passing through the coordinates (X1, P1) becomes the target power P0 is the additional intermediate value X3. The X coordinate where the inclination is the provisional inclination 4 and the approximate linear function passing through the coordinates (X1, P1) becomes the target power P0 is the additional intermediate value X4.

  Furthermore, the slope equivalent value of the approximate linear function corresponding to the additional intermediate value Xn is referred to as an nth slope equivalent value. For example, the slope equivalent value of the approximate linear function corresponding to the additional intermediate value X3 is referred to as a third slope equivalent value. The slope equivalent value of the approximate linear function corresponding to the additional intermediate value X4 is referred to as a fourth slope equivalent value.

  The corrected slope of the modified approximate function f used in the fifth embodiment is derived based on the temporary slope N and the slope N (where N is an integer constant equal to or greater than 3). The corrected inclination is, for example, an average value of the temporary inclination N and the inclination N.

  FIG. 11 illustrates the configuration of the correction voltage setting unit 32 when the correction value Xf is derived using the temporary inclination 4 and the inclination 4.

  The average unit 32m1 receives the inclination 1 from the first inclination equivalent value reading unit 32a, receives the inclination 2 from the second inclination equivalent value reading unit 32c, and takes the average of the inclination 1 and the inclination 2. As described above, the average of the inclination 1 and the inclination 2 is the temporary inclination 3.

  The second intermediate voltage deriving unit (additional intermediate value deriving unit) 32n1 has an approximate linear function whose initial power P1 is the value when the slope is the temporary slope n and the value X of the control signal is the initial value X1. An additional intermediate value Xn, which is the value of the control signal when taking P0, is derived. However, in the second intermediate voltage deriving unit 32n1, n = 3. Therefore, the second intermediate voltage deriving unit 32n1 derives the additional intermediate value X3 that is the value of the control signal when the inclination is the temporary inclination 3 and the approximate linear function passing through the coordinates (X1, P1) takes the target power P0. To do. The second intermediate voltage deriving unit 32n1 receives the temporary slope 3 from the average unit 32m1, receives the target power P0 from the target power input unit 10, receives the initial power P1 from the power measurement unit 42, and receives the initial value X1 as the initial voltage. Received from the setting unit 22.

  The additional intermediate value Xn can be derived using the above equation (9).

  Therefore, the second intermediate voltage deriving unit 32n1 can derive the additional intermediate value X3 as X1 + (P0−P1) / provisional inclination 3.

The third inclination equivalent value reading unit (additional inclination equivalent value reading unit) 32p1 reads the nth inclination equivalent value corresponding to the additional intermediate value Xn, which is the inclination equivalent value of the approximate linear function, from the inclination equivalent value recording unit 31. However, in the third inclination equivalent value reading unit 32p1, n = 3. Therefore, the third inclination equivalent value reading unit 32p1 approximates the linear function (coordinates (X3,
The third inclination equivalent value (for example, inclination 3), which is the inclination equivalent value of P3) (see FIG. 10), is read from the inclination equivalent value recording unit 31.

  The average unit 32m2 receives the provisional inclination 3 from the average unit 32m1, receives the inclination 3 from the third inclination equivalent value reading unit 32p1, and takes the average of the provisional inclination 3 and the inclination 3. As described above, the average of the temporary inclination 3 and the inclination 3 is the temporary inclination 4.

  The third intermediate voltage deriving unit (additional intermediate value deriving unit) 32n2 has an approximate linear function whose target power is the initial power P1 when the slope is the temporary slope n and the value X of the control signal is the initial value X1. An additional intermediate value Xn, which is the value of the control signal when taking P0, is derived. However, n = 4 in the third intermediate voltage deriving unit 32n2. Therefore, the third intermediate voltage deriving unit 32n2 derives the additional intermediate value X4 that is the value of the control signal when the inclination is the temporary inclination 4 and the approximate linear function passing through the coordinates (X1, P1) takes the target power P0. To do. The third intermediate voltage deriving unit 32n2 receives the provisional slope 4 from the average unit 32m2, receives the target power P0 from the target power input unit 10, receives the initial power P1 from the power measurement unit 42, and receives the initial value X1 as the initial voltage. Received from the setting unit 22.

  The additional intermediate value Xn can be derived using the above equation (9).

  Therefore, the third intermediate voltage deriving unit 32n2 can derive the additional intermediate value X4 as X1 + (P0−P1) / provisional inclination 4.

The fourth slope equivalent value reading unit (additional slope equivalent value reading unit) 32p2 reads the nth slope equivalent value, which is the slope equivalent value of the approximate linear function, corresponding to the additional intermediate value Xn from the slope equivalent value recording unit 31. However, in the fourth inclination equivalent value reading unit 32p2, n = 4. Therefore, the fourth inclination equivalent value reading unit 32p2 corresponds to the approximate linear function (coordinates (X4,
P4) (where P4 is the power of the output signal when the control signal taking the additional intermediate value X4 is given to the variable gain attenuator 2)), for example, a fourth slope equivalent value (for example, , Inclination 4) is read from the inclination equivalent value recording unit 31.

  The corrected inclination deriving unit 32d5 receives the temporary inclination 4 from the average unit 32m2, and receives the inclination 4 from the fourth inclination equivalent value reading unit 32p2. Further, the corrected inclination deriving unit 32d5 derives the corrected inclination as an average value of the temporary inclination 4 and the inclination 4.

  The corrected voltage deriving unit (corrected value deriving unit) 32e5 derives the value of the control signal when the corrected approximate function takes the target power P0 as the corrected value Xf. The correction value Xf can be derived using the above equation (4). However, the correction voltage deriving unit 32e5 receives the correction inclination from the correction inclination deriving unit 32d5.

  Next, the operation of the fifth embodiment will be described.

  The operation of the output control system 1 when the control signal having the initial value X1 is given to the variable gain attenuator 2 is the same as that of the first embodiment, and the description thereof is omitted (see FIG. 4).

  When a control signal having an initial value X1 is given to the variable gain attenuator 2, the power of the output signal output from the variable gain attenuator 2 becomes the initial power P1. The power measuring unit 42 receives the digitized output signal from the A / D converter 4 and measures the power to obtain the initial power P1. The measurement result (initial power P1) is given to the correction voltage setting unit 32 of the correction value deriving device 30.

  In addition, the initial voltage setting unit 22 supplies the initial value X1 and the target power input unit 10 supplies the target power P0 to the correction voltage setting unit 32.

  Based on the initial value X1, the first gradient equivalent value reading unit 32a reads the gradient 1 and supplies it to the first intermediate voltage deriving unit 32b. The first intermediate voltage deriving unit 32b derives the intermediate value X2 based on the target power P0, the initial power P1, the slope 1, and the initial value X1 (see Expression (1)).

  Based on the intermediate value X2, the second inclination equivalent value reading unit 32c reads the inclination 2.

  The average part 32m1 takes the average of the inclination 1 and the inclination 2 (provisional inclination 3).

  The second intermediate voltage deriving unit 32n1 derives an additional intermediate value X3 that is the value of the control signal when the approximate linear function having the inclination of the temporary inclination 3 and passing through the coordinates (X1, P1) takes the target power P0.

  The third inclination equivalent value reading unit 32p1 reads the inclination 3 based on the additional intermediate value X3.

  The average part 32m2 takes the average of the temporary inclination 3 and the inclination 3 (provisional inclination 4).

  The third intermediate voltage deriving unit 32n2 derives an additional intermediate value X4 that is the value of the control signal when the approximate linear function passing through the coordinates (X1, P1) has the provisional inclination 4 and takes the target power P0.

  The fourth inclination equivalent value reading unit 32p2 reads the inclination 4 based on the additional intermediate value X4.

  The corrected inclination deriving unit 32d5 derives the corrected inclination as an average value of the temporary inclination 4 and the inclination 4.

  The correction voltage deriving unit 32e5 receives the correction gradient from the correction gradient deriving unit 32d5, and derives the correction value Xf using the above-described equation (4).

  According to the fifth embodiment, there are the same effects as in the first embodiment.

  Moreover, said embodiment is realizable as follows. A program for realizing each of the above-described parts (for example, the inclination equivalent value recording unit 31 and the correction voltage setting unit 32) in a computer having a CPU, a hard disk, and a medium (floppy (registered trademark) disk, CD-ROM, etc.) reading device. Read the media on which the file is recorded and install it on the hard disk. Such a method can also realize the above functions.

1 is a block diagram showing a configuration of an output control system 1 according to an embodiment of the present invention. 4 is a graph showing a power characteristic F when an input signal having a predetermined power is given to the variable gain attenuator 2. It is a block diagram which shows the structure of the correction voltage setting part 32 concerning 1st embodiment. It is a figure for demonstrating operation | movement of the output control system 1 when the control signal which takes the initial value X1 is given to the variable gain attenuator 2. FIG. It is a figure for demonstrating operation | movement of the output control system 1 at the time of derivation | leading-out of the correction value Xf. It is a block diagram which shows the structure of the correction voltage setting part 32 concerning 2nd embodiment. It is a block diagram which shows the structure of the correction voltage setting part 32 concerning 3rd embodiment. It is a graph which shows the correction approximate function f which is a quadratic function. It is a block diagram which shows the structure of the correction voltage setting part 32 concerning 4th embodiment. It is a graph which shows the correction | amendment approximate function f used in 4th embodiment. It is a block diagram which shows the structure of the correction voltage setting part 32 concerning 5th embodiment.

Explanation of symbols

X Control signal value (voltage)
X1 initial value
X2 intermediate value
X3, X4 Additional intermediate values
Xf correction value
P Output signal power
P0 target power
P1 Initial power
P2, P3, P4 power
Pf power
f1, f2, f3 approximate linear function
f Modified approximate function 1 Output control system 2 Variable gain attenuator (amplitude changer)
4 A / D converter 6 D / A converter 10 Target power input unit 11 Switch 21 Initial value recording unit 22 Initial voltage setting unit 30 Correction value deriving device 42 Power measurement unit 31 Inclination equivalent value recording unit 32 Correction voltage setting unit 32a First slope equivalent value reading unit 32b First intermediate voltage deriving unit (intermediate value deriving unit)
32c Second inclination equivalent value reading section 32d1, 32d2, 32d4, 32d5 Correction inclination derivation section 32e1, 32e2, 32e3, 32e4, 32e5 Correction voltage derivation section (correction value derivation section)
32t Modified approximate function deriving unit 32f Average unit 32g Second intermediate voltage deriving unit (additional intermediate value deriving unit)
32h Third inclination equivalent value reading unit (additional inclination equivalent value reading unit)
32m1, 32m2 average part 32n1 second intermediate voltage deriving part (additional intermediate value deriving part)
32n2 third intermediate voltage deriving unit (additional intermediate value deriving unit)
32p1 third inclination equivalent value reading unit (additional inclination equivalent value reading unit)
32p2 fourth inclination equivalent value reading unit (additional inclination equivalent value reading unit)

Claims (15)

The output when the output signal is output by changing the amplitude of the input signal, and the control signal that takes the initial value X1 is given to the amplitude changer that controls the rate of change of the amplitude based on the value X of the control signal A correction value deriving device that derives a correction value Xf that is a value of the control signal such that the power of the output signal approaches the target power P0 rather than the initial power P1 that is the power of the signal,
When the power P of the output signal is expressed by an approximate linear function that is a linear function with the value X of the control signal as a variable, a slope equivalent value corresponding to the slope of the approximate linear function is set to the value X of the control signal. An inclination equivalent value recording section recorded in association with each other;
A first inclination equivalent value reading unit that reads from the inclination equivalent value recording unit a first inclination equivalent value that is the inclination equivalent value of the approximate linear function corresponding to the initial value X1;
When the approximate linear function in which the slope is a value corresponding to the first slope equivalent value and the value X of the control signal is the initial value X1 is the initial power P1 takes the target power P0 An intermediate value derivation unit for deriving an intermediate value X2 that is the value of the control signal of
A second inclination equivalent value reading unit that reads a second inclination equivalent value corresponding to the intermediate value X2 from the inclination equivalent value recording unit, which is the inclination equivalent value of the approximate linear function;
A modified approximate function that represents the power P of the output signal, with the value X of the control signal defined as a variable, defined based on the first slope equivalent value, the second slope equivalent value, the initial value X1, and the initial power P1. A correction value deriving unit for deriving the value of the control signal when taking the target power P0 as the correction value Xf;
A correction value deriving device comprising: The correction value deriving device according to claim 1,
The slope equivalent value is the slope of the approximate linear function or the reciprocal of the slope of the approximate linear function.
Correction value deriving device. The correction value deriving device according to claim 1 or 2,
The modified approximate function is a linear function having a modified slope derived based on the first slope equivalent value and the second slope equivalent value;
Correction value deriving device. The correction value deriving device according to claim 3,
The corrected inclination is an average value of an inclination corresponding to the first inclination equivalent value and an inclination corresponding to the second inclination equivalent value.
Correction value deriving device. The correction value deriving device according to claim 3,
The corrected inclination is an inverse of an average value of an inverse of an inclination corresponding to the first inclination equivalent value and an inverse of an inclination corresponding to the second inclination equivalent value.
Correction value deriving device. The correction value deriving device according to claim 1 or 2,
The modified approximate function is a quadratic function;
The value when the value X of the control signal is the initial value X1 is the initial power P1,
The differential coefficient when the value X of the control signal is the initial value X1 is a slope corresponding to the first slope equivalent value,
The differential coefficient when the value X of the control signal is the intermediate value X2 is a slope corresponding to the second slope equivalent value,
Correction value deriving device. The correction value deriving device according to claim 3,
The slope corresponding to the first slope equivalent value is designated as slope 1,
The slope corresponding to the second slope equivalent value is designated as slope 2,
An inclination corresponding to the nth inclination equivalent value is assumed to be an inclination n (where n is an arbitrary integer of 3 or more),
Let N be an integer constant greater than or equal to 3,
When the average value of the slopes from the slope 1 to the slope n−1 is defined as the temporary slope n,
The value of the control signal when the approximate linear function takes the target power P0 when the slope is the temporary slope n and the value X when the control signal value X is the initial value X1 is the initial power P1 An additional intermediate value derivation unit for deriving an additional intermediate value Xn,
An additional slope equivalent value reading unit that reads from the slope equivalent value recording unit an n-th slope equivalent value that is the slope equivalent value of the approximate linear function corresponding to the additional intermediate value Xn;
With
The corrected slope is derived based on slopes from slope 1 to slope N;
Correction value deriving device. The correction value deriving device according to claim 7,
The corrected inclination is an average value of inclination from inclination 1 to inclination N.
Correction value deriving device. The correction value deriving device according to claim 7,
The corrected inclination is an average value of any two or more of inclinations from inclination 1 to inclination N;
Correction value deriving device. The correction value deriving device according to claim 3,
The slope corresponding to the first slope equivalent value is designated as slope 1,
The slope corresponding to the second slope equivalent value is designated as slope 2,
An inclination corresponding to the nth inclination equivalent value is assumed to be an inclination n (where n is an arbitrary integer of 3 or more),
Let N be an integer constant greater than or equal to 3,
Temporary inclination 3 is an average value of inclination 1 and inclination 2,
When the average value of the temporary inclination m-1 and the inclination m-1 is the temporary inclination m (where m is an arbitrary integer of 4 or more),
The value of the control signal when the approximate linear function takes the target power P0 when the slope is the temporary slope n and the value X when the control signal value X is the initial value X1 is the initial power P1 An additional intermediate value derivation unit for deriving an additional intermediate value Xn,
An additional slope equivalent value reading unit that reads from the slope equivalent value recording unit an n-th slope equivalent value that is the slope equivalent value of the approximate linear function corresponding to the additional intermediate value Xn;
With
The corrected inclination is derived based on the temporary inclination N and the inclination N.
Correction value deriving device. The correction value deriving device according to claim 10,
The corrected inclination is an average value of the temporary inclination N and the inclination N.
Correction value deriving device. The correction value deriving device according to any one of claims 1 to 11,
The value X of the control signal is a voltage,
Correction value deriving device. The output when the output signal is output by changing the amplitude of the input signal, and the control signal that takes the initial value X1 is given to the amplitude changer that controls the rate of change of the amplitude based on the value X of the control signal A correction value derivation method for deriving a correction value Xf that is a value of the control signal such that the power of the output signal approaches the target power P0 rather than the initial power P1 that is the power of the signal,
When the power P of the output signal is expressed by an approximate linear function that is a linear function with the value X of the control signal as a variable, a slope equivalent value corresponding to the slope of the approximate linear function is set to the value X of the control signal. A slope equivalent value recording process recorded in association with each other;
A first slope equivalent value reading step of reading a first slope equivalent value corresponding to the initial value X1 from the recorded content of the slope equivalent value recording step, which is the slope equivalent value of the approximate linear function;
When the approximate linear function in which the slope is a value corresponding to the first slope equivalent value and the value X of the control signal is the initial value X1 is the initial power P1 takes the target power P0 An intermediate value deriving step of deriving an intermediate value X2 that is the value of the control signal of
A second slope equivalent value reading step of reading a second slope equivalent value corresponding to the intermediate value X2 from the recorded content of the slope equivalent value recording step, which is the slope equivalent value of the approximate linear function;
A modified approximate function that represents the power P of the output signal, with the value X of the control signal defined as a variable, defined based on the first slope equivalent value, the second slope equivalent value, the initial value X1, and the initial power P1. A correction value deriving step of deriving the value of the control signal when taking the target power P0 as the correction value Xf;
A correction value derivation method comprising: The output when the output signal is output by changing the amplitude of the input signal, and the control signal that takes the initial value X1 is given to the amplitude changer that controls the rate of change of the amplitude based on the value X of the control signal A program for causing a computer to execute a correction value derivation process for deriving a correction value Xf that is a value of the control signal that brings the power of the output signal closer to the target power P0 than the initial power P1 that is the power of the signal. There,
The correction value derivation process includes:
When the power P of the output signal is expressed by an approximate linear function that is a linear function with the value X of the control signal as a variable, a slope equivalent value corresponding to the slope of the approximate linear function is set to the value X of the control signal. A slope equivalent value recording process recorded in association with each other;
A first slope equivalent value reading step of reading a first slope equivalent value corresponding to the initial value X1 from the recorded content of the slope equivalent value recording step, which is the slope equivalent value of the approximate linear function;
When the approximate linear function in which the slope is a value corresponding to the first slope equivalent value and the value X of the control signal is the initial value X1 is the initial power P1 takes the target power P0 An intermediate value deriving step of deriving an intermediate value X2 that is the value of the control signal of
A second slope equivalent value reading step of reading a second slope equivalent value corresponding to the intermediate value X2 from the recorded content of the slope equivalent value recording step, which is the slope equivalent value of the approximate linear function;
A modified approximate function that represents the power P of the output signal, with the value X of the control signal defined as a variable, defined based on the first slope equivalent value, the second slope equivalent value, the initial value X1, and the initial power P1. A correction value deriving step of deriving the value of the control signal when taking the target power P0 as the correction value Xf;
A program with The output when the output signal is output by changing the amplitude of the input signal, and the control signal that takes the initial value X1 is given to the amplitude changer that controls the rate of change of the amplitude based on the value X of the control signal A program for causing a computer to execute a correction value derivation process for deriving a correction value Xf that is a value of the control signal that brings the power of the output signal closer to the target power P0 than the initial power P1 that is the power of the signal A recording medium readable by a computer,
The correction value derivation process includes:
When the power P of the output signal is expressed by an approximate linear function that is a linear function with the value X of the control signal as a variable, a slope equivalent value corresponding to the slope of the approximate linear function is set to the value X of the control signal. A slope equivalent value recording process recorded in association with each other;
A first slope equivalent value reading step of reading a first slope equivalent value corresponding to the initial value X1 from the recorded content of the slope equivalent value recording step, which is the slope equivalent value of the approximate linear function;
When the approximate linear function in which the slope is a value corresponding to the first slope equivalent value and the value X of the control signal is the initial value X1 is the initial power P1 takes the target power P0 An intermediate value deriving step of deriving an intermediate value X2 that is the value of the control signal of
A second slope equivalent value reading step of reading a second slope equivalent value corresponding to the intermediate value X2 from the recorded content of the slope equivalent value recording step, which is the slope equivalent value of the approximate linear function;
A modified approximate function that represents the power P of the output signal, with the value X of the control signal defined as a variable, defined based on the first slope equivalent value, the second slope equivalent value, the initial value X1, and the initial power P1. A correction value deriving step of deriving the value of the control signal when taking the target power P0 as the correction value Xf;
A recording medium comprising:

Images