JPS5962944A - Analog signal input device - Google Patents

Abstract

PURPOSE:To extend the input voltage range without deteriorating the accuracy of an A/D converter, by multiplying a prescribed gain Y to an input signal X, A/D-converting the X, Y, inputting the result to a computer and comparing the X, Y with the preset conversion upper and lower limits. CONSTITUTION:An analog input signal X is inputted to a multiplier (preamplifier) 2 via a hold circuit 1, and it is multiplied with an initial set gain Y from a D/A converter 4. The outputs X, Y from the multiplier 2 are A/D-converted at an A/D converter 3 and the values X, Y from the converter 3 are inputted to a computer 5. The computer 5 compares the inputted, X, Y with the preset A/D conversion upper and lower limits VH, VL. From the result of comparison, a value Z is applied to the circuit 1 and this is repeated until the values X, Y are within the range of VL<=X, Y<=VH. Thus, the A/D conversion input signal range is extended to the input voltage range of the multiplier 2 without deteriorating the accuracy of the A/D converter 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to analog signal tone analog-to-digital conversion (A
The present invention relates to an analog signal input device that inputs the signal into a converter by converting the signal into a converter.

Configuration of conventional example and its problems When inputting an analog signal to a converter using a conventional analog signal human-powered device, the analog signal human-powered device is an analog signal input means of an A/D converter that performs analog-to-digital conversion of the input signal. There was a problem that it was defined by

OBJECTS OF THE INVENTION The present invention aims to provide a complete analog signal input device that can extend the A/D conversion human power signal range in the entire preamplification human power voltage range building without compromising the A/D conversion precision [ffi]. purpose.

Structure of the Invention The analog signal input device of the present invention, as shown in FIG. A converter, a signal input means for inputting the output of the analog-to-digital converter, and determining whether the signal input input by the signal input means is within a preset range. determining means; and setting the gain of the preamplifier so that the signal input is within the preset range based on the determining means.
a gain setting means for outputting the g signal; and one of the determining means.
a combiner comprising: a dividing means for dividing the signal input by the gain set by the gain setting means based on a result of the calculation; and a storage means for storing the output of the dividing means as input data; and the gain setting means. and a digital-to-analog converter that converts the output from the preamplifier into a digital-to-analog converter and applies it to the gain input terminal of the preamplifier.

DESCRIPTION OF EMBODIMENTS FIG. 2 shows a block diagram of an embodiment of the analog signal input device of the present invention, in which 1 is a hold circuit, 2 is a multiplier (preamplifier), 3 is an A/D converter, and 4 is a D /Am converter, 5 is a converter.

FIG. 3 is an explanatory diagram showing the analog signal input range of each part in FIG. , V.A.
H indicates the upper limit of the positive signal input of the A/D converter 3, and VA
Indicates the lower limit of the negative signal human power of the LViA/D converter 3, and V
H is the A/D conversion upper limit threshold set in the converter 5, vL is the A/D conversion lower limit threshold set in the computer, K1 is the input range of the multiplier 2, and K is the A/D converter 3.
The input range K3 is the threshold value predetermined range in the computer 5.

A detailed explanation will be given below based on FIGS. 2 to 4.

By inputting the hold signal Z from the computer 5 to the hold circuit 1, the analog signal X is held while the hold circuit 1 performs the following operations until it is taken into the computer 5. In the held input signal X, tl:I, the initial setting gain y
(y=i), A/D converted by the A/D converter 3, and then manually input to the computer 5 as X-Y.

If the value of X@Y at the output of multiplier 2 is larger than the upper limit VAH of 2 in the analog signal input range of A/D converter 3 shown in FIG. 5, and if the value of It is input to the converter 5. The value of
It is compared within the converter 5 with the digital value of the conversion lower limit threshold VL. If the value of
For example, the computer 5 outputs Y-09 as Y-09. The value of Y outputted from the computer 5 is D/A converted by the D/A converter 4 and inputted as Y manual input to the multiplier 2, and the output of the multiplier 2 is X-Y. This X-Y output is A at 0 converter 3.
After the /D conversion is performed, the signal is taken into the converter 5. The newly captured X-Y is again compared with VH in the computer 5, and if the value of X-Y is greater than vH, the same operation as above is performed again, setting Y2 to 0.8, for example. If the value of the operation sound X-Y as described above is VL≦X
Repeat until the range is -Y≦Toughness. Mani, initial X-Y
If the number of people is smaller than ■, for example, Y=-1, -0
,9.

-08,...,0.9, and perform the same operation as above
Repeat until the value of is within the range of vL≦X-Y≦vH.

The value of X-Y is the initial setting gain and VL≦X-Y≦VJ (
If so, take in the value of X-Y as is. 'By the above operation, divide X-Y in the range of vL≦X-Y≦VH by the value of Y at the time the data was imported,
The result is taken into the compiler 5 as an input signal X.

Figure 4 shows the combination of the above operations = - evening processing 70 -
Theyat'l shows. This will be explained below.

(1) Output the hold signal Z, set Y-1 as the initial gain, and output this.

(2) Import the X-Y data.

(3) ■Determine whether □≦X−Y.

(4) When the determination result in step (3) is YES, lower the value of Y and output the lowered value of Y.

(5) Fully determine whether Y<-1, and if the determination result is NO, return to step (2), and if YES, it becomes impossible to import.

(6) When the judgment result of step (3) is NO, ■1≧
Determine whether it is X/Y.

(7) If the determination result in step (6) is YES, increase the value of Y and output a clear sound of the increased Y.

(8) Y) Determine whether it is 1 and the determination result is NO.
If the answer is YES, the process returns to step (2), and if the answer is YES, the data cannot be imported.

(9) If the judgment result in step (6) is NO,
- End your life with Y money Y.

(10) The calculation result in step (9) is fetched as data and the process ends at A7.

In this way, in this embodiment, the analog signal is manually multiplied by a predetermined gain Y by the XK multiplier 2, and X-Y is multiplied by the A/D converter 3.
A/D conversion is performed and input to the computer 5, and the x-Y value input to the computer 5 is converted to the preset A/D conversion upper limit threshold vH and the A/D conversion lower limit threshold. Since the multiplier 20 gain Yffi is set so that the output X-Y of the /D converter 3 falls within the threshold value setting range of 3, the multiplier 2 has a high precision NΦ in the signal human power range of 1ffiK. conversion can be performed.

Effects of the Invention According to this invention, A/D conversion can be performed without reducing A/D conversion accuracy.
The conversion input signal range can be extended to the input voltage range of the amplifier.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the configuration of this invention, Figure 2 is a block diagram of an embodiment of this invention, Figure 3 is an explanatory diagram of the analog signal input range of each part, and Figure 4 is a flowchart of the computer. be. 1... Hold circuit, 2... Multiplier (preamplifier, 3-A/D converter, 4... D/A converter, 5 ・Combiner)

Claims (1)

[Claims] A variable gain preamplifier for amplifying analog signal input, an analog-to-digital converter for converting the output of the preamplifier from analog to digital, and signal input means for inputting the output of the analog-to-digital converter. a determining means for fully determining whether the signal input taken in by the signal input means is within a preset range; a gain setting means for outputting a signal for setting the gain of the front 1d amplifier; and a nose removal means for dividing the @lJ signal input by the gain set by the gain setting means based on the determination result of the determination means. and a storage means for storing the output of the dividing means as input data, and a digital-to-analog converter for converting the output from the gain setting means into a digital-to-analog converter and applying it to the gain input terminal of the preamplifier. Analog signal input device equipped with a device.