JPH0320926B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Prior Art) The present invention relates to a data control method that inputs analog data with different amplitudes and amplifies them to a constant amplitude.

(Background Art) Conventionally, analog data was amplified by one amplifier, the result was fed back, and the amplification degree was switched and outputted using an amplification switching function included in the amplifier circuit according to the result. As a result, the following drawbacks arose.

1 The frequency characteristics change when switching due to the frequency characteristics of the amplifier.

2. Operating time is delayed because the amplification degree is switched by a relay.

3. It is difficult to restore the original amplification level after switching the amplification level.

4 Multi-stage processing makes the circuit configuration complicated.

(Problem to be solved by the invention) The purpose of the present invention is to eliminate these drawbacks.
Analog data is amplified by multiple amplifiers, each with a different amplification degree, and the result is determined by a judgment circuit that selects the largest value among the data that has a smaller value than a predetermined value. The present invention is characterized in that data is determined to be optimal data and is output, and its purpose is to obtain an output with a constant amplitude without having the drawbacks of the prior art.

(Structure and operation of the invention) Fig. 1 shows the hardware configuration of an embodiment of this data control system, where 1 is an amplifier, and each amplifier is configured with an amplification difference of 2 ⁿ times. This is a group of amplifiers organized in order.

2 is an A/D converter that converts the analog data amplified by each amplifier into digital data, but these are not composed of multiple A/D converters but one channel switcher and one A/D converter.
It is composed of a D converter and sequentially performs A/D conversion processing under program control and passes data to a judgment circuit.

3 is a circuit that judges the most suitable data among the A/D converted data, and is composed of a central processing unit and an input/output device, and inputs the A/D converted data according to an input command and outputs a constant value. It determines the largest data among the smaller data and outputs it using an output command.

The A/D converter 2 and the central processing unit 3 are I/D converters.
They are connected by a θ bus, and 2 is part of the input/output device.

FIG. 2 shows the hardware configuration of the judgment circuit, in which reference numeral 1 is a central processing unit that has a program having a function of extracting optimal data from input data, and thereby performs input/output and data extraction processing.

Reference numeral 2 denotes a channel switch, which selects a necessary channel of analog data under the control of a central processing unit (hereinafter referred to as CPU) and connects the analog data to an A/D converter.

3 is an A/D converter that converts analog data into digital data.

4 is a digital output device that outputs optimal data in digital format.

5 is a D/A converter for returning the optimized data to the original analog data.

FIG. 3 is a processing flow in which the program determines whether to extract optimal data, and shows a procedure for digitizing input analog data and extracting optimal data for the input analog data.
The analog data in this case is data passed through amplifiers of each amplification degree.

The detailed program execution procedure will be explained below according to the processing flow shown in FIG.

(1) First, set the first channel of the dedicated analog channel (usually done in about four stages) for the data component, output the channel value to the channel switch, and apply control.

(2) Convert analog data (data selected by the channel switch) to digital data.

(3) Convert input data into absolute values and convert them into a data format that is easy to judge.

(4) Determine the magnitude relationship between the absolute value data (I _i ) and the constant value (judgment standard) data (A), and if I _i is greater or the same, proceed to step determination.

(5) In step judgment, it is determined whether the input data (I _i ) is the lowest amplification stage of the amplification stage, and if it is the data of the lowest amplification stage, that input data (I _i ) is considered as the optimal data for that input. Let them set.

(6) If it is not the lowest amplification stage, output the channel value of the next amplification stage to the channel switcher.

(7) Processes (2), (3), and (4) are also performed on the analog data of the next amplification stage to determine the magnitude relationship _.
If A is smaller than A, the data is registered as a primary register.

(8) After determining all the data, extract the largest data from the registered data and use it as the optimal data for the input data.

By performing the above-described processing on each input analog data, optimal data extraction is performed using multi-stage data.

Figure 4 is a diagrammatic representation of the judgment process.
The optimal data found in the judgment process is stage C, but
The process leading to this will be explained next. First, the amplification data of the a stage is input and a judgment process is performed, but since it is larger than a certain value (A), the a stage is judged as NG, and the next stage b amplification data is input and a similar judgment process is performed. Since this b-stage is also larger than a certain value, it becomes NG, and the next c-stage amplification data is input and judgment processing is performed. As the result is smaller than the constant value (A), it is temporarily registered as optimal data, and the next d stage is also judged and found to be smaller, so the c and d stages are compared and the larger c
The column (star) is extracted as the optimal data for this input.

As explained above, the first embodiment uses a plurality of amplifiers with different amplification degrees and performs processing to determine the optimal data for input data. (explained below) has been improved.

Improvement point 1 By making the frequency characteristics of each stage (amplifiers with different amplification degrees) the same, changes in frequency characteristics due to switching of amplifiers are eliminated.

2. Since the amplification stage is not switched by monitoring the output, there is no delay in switching.

3. Amplification stages can be easily switched and restored due to program processing.

4. Multi-stage judgment processing can be processed without complicating the hardware configuration.

(Effects of the Invention) The present invention has the advantage that the constant reference value and the number of input channels can be varied because the optimal data extraction of input data is performed through program processing. It can be used and is highly versatile.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of hardware in the data control system, and dotted lines indicate that there are a plurality of identical amplifiers, etc. FIG. 2 shows the configuration of a portion of the judgment circuit shown in FIG. 1 for each input/output device. FIG. 3 shows a judgment processing flow for the program to extract optimal data from input data. Figure 4 shows how to create data with different amplification degrees for one type of input analog data.
It is a figure which shows the method of determining the optimal data among them.

Claims (1)

[Claims] 1 A data processing method that amplifies analog data to a predetermined amplitude, which includes a plurality of amplifiers connected to a terminal into which analog data is input and a judgment circuit connected to the output thereof, and each amplifier has a different amplification degree. 1. A data control method, wherein the determination circuit outputs data having a value smaller than a predetermined value and closest to the predetermined value among the outputs of each amplifier as the optimal data.