JPS61245630A - Analog-to-digital conversion method - Google Patents

Abstract

PURPOSE:To obtain the display data just with the binary-decimal conversion by performing the initial control so as to obtain the 2<n> output when the analog quantity of 2<n> is applied to an n-bit A/D converter and then multiplying 2<n> obtained by multiplying said analog quantity by 1/2<m> and applying it to the A/D converter by 2<m> when the analog quantity 2<n>X2<m> is measured. CONSTITUTION:The initialization is carried out so that the output of '1' is obtained with all (n) bits when the analog quantity of 2<n> is applied to an n-bit A/D converter 2. Then, the analog quantity of (2<n>X2<m>) is multiplied by 1/2<m> when this analog quantity is measured. Thus the output of 1 is obtained with all (n) bits by the converter 2. These outputs are shifted up or down by (m) bits and therefore the binary data of '1' is obtained with all (n+m) bits. The binary-decimal conversion is given to the binary data to obtain the display data corresponding to the original analog quantity. In other words, an analog quantity is obtained just with the binary-decimal conversion and with no use of a conversion table. This reduces the cost and also shorten the data converting time.

Description

[Detailed Description of the Invention] [Summary] For example, an analog quantity 2' indicating the operating state of a monitored station device
is an n-bit analog/digital converter (hereinafter referred to as A/
(abbreviated as D converter), initial adjustment is made so that an output of 2n is obtained.Next, when measuring an analog quantity 2 x 2, this analog quantity is multiplied by 1/2'' and the above A By adding it to the /D converter and doubling the obtained 2, display data can be obtained only by binary-decimal conversion.

[Industrial application field]

The present invention relates to an improvement in an analog quantity measuring method used when, for example, a monitoring station monitors the operation of terminal stations and intermediate relay stations that constitute a microwave radio relay line.

FIG. 3 shows a block diagram of a microwave radio relay line.

In the figure, a plurality of intermediate relay stations are arranged between terminal stations at both ends, and operational data from each station is sent to a monitoring station via a wireless link connecting these stations. The monitoring station uses these data to monitor the operating status of each intermediate relay station and terminal station, but all the received operating data is digital (for example, about 50 items per round) and converted to the original decimal number. It is converted and displayed on a display, etc., but it is necessary to obtain analog quantities as cheaply and in a short time as possible.

[Conventional technology]

Figure 4 shows a block diagram of a conventional analog quantity measuring method.
FIG. 5 shows the flow chart of FIG.

Therefore, FIG. 4 will be explained with reference to FIG. 5. still,
For example, when the maximum input analog amount is 650, the analog/digital converter (hereinafter abbreviated as A/D converter)
Suppose that the state is 1 when everything is in focus. Also, units and decimal points are omitted.

(1) When the analog quantity of observation #1 fluctuates in the range of 0 to 1000/When the analog quantity 1000 is input, adjust the level converter 1 so that 650 is input to the AID converter 2 (No. (See Figure 4-■).

・A 1111111111 is output from the ID converter 2, but the converted binary data is extracted from the #1 conversion table in the memory 3, converted from binary to decimal, and converted to 1
000 is converted and displayed (see Figure 4-○~■).

・A/D converter 2 for analog quantities less than 1000
Conversion data corresponding to the obtained binary value is obtained, and this is converted into a decimal value and displayed.

(2) When the analog value of observation #2 fluctuates in the range of 0 to 500 - When the analog value of 500 is input, level adjuster 1 is set to 6
Adjust so that 50 is input to A ID converter 3 (4th
(See Figure ■).

・Convert and display that the output 1111111111 of the A ID converter 3 is 500 using the #2 conversion table in the memory 5 and binary-IO conversion (Figure 4 ■-■
reference).

That is, the maximum value of both #1 and #2 becomes 1111111111 when A/D converted, but this is converted by the corresponding conversion table and further converted to binary - 1.
Separate display data is obtained by decimal conversion.

[Problem that the invention seeks to solve]

However, this method requires a conversion table (for example, one written in a read-only memory) equal to the number of pieces of input information, and it takes a lot of man-hours to prepare it, which increases the cost.

Furthermore, as the number of effective digits in the conversion table increases, the memory capacity increases, so there is a problem that data conversion becomes slower.

[Means for solving problems]

The above problem is that when an analog quantity of 2 (n is a positive integer) is applied to an n-bit analog/digital converter via a level converter, the level is converted so that the maximum output is 1 for all n bits. Adjust the analog quantity 2nx2'v
When l (m is a positive or negative integer) is input, the analog quantity is multiplied by 1/2 and added to the analog/digital converter through the level converter, and all n bits of the analog/digital converter are set to 1. The problem is solved by the analog/digital conversion method of the present invention which shifts the output up or down by m bits and then converts it from binary to decimal to obtain display data.

[Effect]

In the present invention, initial settings are made so that when an analog quantity of 1 is applied to an n-bit A/D converter, an output of all 1's for n bits is obtained.

Next, when measuring the analog quantity of rxr, by multiplying this analog quantity by 1/21, an output of n bits all 1 can be obtained from the A/D converter. In this case, binary data with all 1 bits is obtained. If this is converted from binary to decimal, display data corresponding to the original analog quantity can be obtained.

That is, since an analog quantity can be obtained only by binary-decimal conversion without using a conversion table, costs are reduced and data conversion becomes faster.

〔Example〕

The contents of the present invention will be specifically explained below with reference to illustrated embodiments. Note that the same reference numerals refer to the same objects throughout the plan.

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
The flowchart of the figure is shown.

Therefore, the operation shown in FIG. 1 will be explained with reference to FIG.

(11 When the analog quantity of observation #1 is 0 to 1000/When the analog quantity is 1024, the output of A/D converter 2 is 10
Initial setting is performed using level converter 1 so that all bits become 1. When it evolves to 10, it becomes 1024 and the measurement range is O~1
024 (see Figure 2 ■-■).

・If you add the analog value 1000, you will get a binary value corresponding to 1000 from A/D converter 2, so convert this to 10
It evolves and the original analog quantity is obtained.

(2) When the analog quantity of observation #2 is O~500 - Double the analog quantity 512 with amplifier 5 and convert it to A/D converter 2
A/D converter 2 with all 10 bits obtained in addition to
Set the output to be shifted down (double) by 1 bit. When it evolves to 10, it becomes 512 and the measurement range is 0~
512 (see Figure 2 ■-■).

- When the analog quantity 500 is added, the corresponding digital quantity is evolved by 10 from the A/D converter 2, and display data corresponding to the original analog quantity is obtained.

(3) When the analog quantity of observation #3 is O~2000・
Analog 11204B is %ed by attenuator 6 and added to A/D converter 2, and the resulting 10 bits are all 1. Set to shift the output of A/D converter 2 by 1 bit (doubling). . When evolved by 10, it becomes 2048, and the measurement range becomes 0 to 2048 (see Figure 2 - ■).

- When the analog quantity 2000 is added, the corresponding digital quantity from the A/D converter 3 is evolved by 10, and the original analog quantity is obtained.

That is, the original analog quantity can be obtained only by binary-decimal conversion without using a conversion table.

〔Effect of the invention〕

As explained in detail above, since the analog quantity observed can be extracted only in the binary-decimal daple, there is an effect that the cost is reduced and the data conversion is speeded up.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
3 is a block diagram of a microwave radio relay line, FIG. 4 is a block diagram of a conventional example, and FIG. 5 is a flow chart of FIG. 4. In the figure, l is a level converter, 2 is a to/D converter, 4 is a memory, 5 is an amplifier, and 6 is an attenuator. A22] Drops on the same QV meeting - Indignant interpretation of the meeting.

Claims (1)

[Claims] When 2^n (n is a positive integer) analog quantity is applied to an n-bit analog/digital converter via a level converter, the output is adjusted so that the maximum output is 1 for all n bits. The level converter is adjusted, and when an analog quantity of 2^n x 2^m (m is a positive or negative integer) is input, the analog quantity is multiplied by 1/2^m and passed through the level converter to the analog/ In addition to the digital converter, the n-bit all-1 output of the analog/digital converter is shifted up or down by m bits, and then converted from binary to decimal to directly obtain display data. Characteristic analog/digital conversion method.