JPS633398B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an analog storage method for numerical values, and particularly to a method for storing a digital value by dividing it into a plurality of digits.

[Conventional technology and problems]

Conventionally, display values obtained by measuring natural phenomena such as frequency, voltage, current, power, gain, time, angle, weight, speed, etc. are analog values that indicate the state of a continuously changing quantity at a certain moment. These analog values are now commonly expressed in decimal digital format.
If this value is stored in decimal digital storage, 12 digital storage elements are required to store the 3-digit value, whereas if an analog memory is used, 2 or 3 digits can be stored in one element. It is. To explain this storage method with reference to FIG. 1, the digital value to be stored is stored in the analog storage 3 by a write command through a digital-to-analog (hereinafter referred to as D/A) converter 2, and is reproduced by a read command. The analog value in the analog memory 3 is read out by the analog memory device 3, and converted by an analog-to-digital (hereinafter referred to as A/D) converter to restore the original digital value. Due to the limitations, there are also limitations on the reproducible value.

[Purpose of the invention]

The present invention is a digit division analog storage method that saves the number of storage elements, which is an advantage of the analog storage method, and compensates for the lack of digits, which is a drawback of the analog storage method, by dividing the storage of the number of digits and combining and restoring the read value during reproduction. The purpose is to provide.

[Structure of the invention]

According to the present invention, a digital value to be stored is divided into the number of digits as required, and in analog storage, D/A conversion is performed for each divided number of digits and stored in the analog storage section. Stored directly in digital storage. At the time of reproduction, the number of digital storage digits is read out as is, and the analog storage value is converted into a digital value through an A/D converter after being read out, and the original digital value is restored by dividing the read digital data and digit composition. It is.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 2, 3, and 4. Figure 2 shows the digital value 1 to be memorized.
A is divided, and the divided digits are divided into units of 2 or 3 digits, and the lower digits are stored in the analog storage through the D/A converter 2 by a write command. The remaining high-order digits are written directly to the digital memory 6 by a write command.
is memorized. At the time of reproduction, an analog value is read from the analog memory 3 by a read command, and converted to a digital value through the A/D converter 4. On the other hand, the stored value of the digital memory is read out as a digital value by a read command, and the upper and lower digits are This method combines and restores the data to reproduce the digital value 5A, and is particularly effective for numerical values that have a small amount of change, centering on constant numerical values. FIG. 3 shows that the upper appropriate digits of the digital value 1A to be stored are stored in the analog storage section 3 by a write command through the D/A converter 2, and when reproducing, the stored value of the analog storage section is read out by a read command and the A/D The digital value restored through the converter 4 is used as the upper digit, and the remaining lower appropriate digits of the digital value 1A to be stored are stored in the digital memory 6 by a write command, and when reproducing, the stored value is read out by a read command. , the lower digits of the digital value, and the reconstructed upper digits and the digital value digits are combined to reproduce the digital value 5A. As mentioned above, the choice is made between the structure shown in FIG. 2, in which the lower digits of the digital value to be stored are stored in analog form, and the structure shown in Fig. 3, in which the upper digits of the digital value to be stored are stored in analog form.
It should be determined by considering the total number of digits and the importance of the upper and lower digits.

FIG. 4 is an embodiment of claim 2. Divide the digital value 1B to be memorized into appropriate digits (in the figure, divide into three parts: upper digit, middle digit, and lower digit),
The upper digits are stored in the first analog storage 3A through the first D/A converter 2A in response to a write command, and the middle digits are stored in the second analog memory 3A through the second D/A converter 2B in response to a write command. The lower digits are stored in the memory 3B, and the lower digits are stored in the third analog memory 3C by a write command through the third D/A converter 2C. At the time of reproduction, the stored value of the first analog memory 3A is read out by a read command, and the digital value restored through the first A/D converter 4A is reproduced, and the upper digit of the digital value 5B is transferred to the second analog memory. The stored value of the converter 3B is read out by a read command and sent to the second A/D converter 4.
The stored value of the third analog memory 3C is read out by the read command to the middle digit of the digital value 5B.
The digital value restored through the converter 4C is reproduced by synthesizing the digital digits with the lower digits of the reproduced digital value 5B.

〔Effect of the invention〕

According to the present invention, it is possible to significantly reduce the number of memory elements, and even if a D/A converter and an A/D converter are attached, the number of IC elements can be reduced, and there are great benefits to miniaturization and power saving.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional analog storage system, FIG. 2 is a block diagram showing one embodiment of the present invention, FIG. 3 is a block diagram showing a second embodiment of the present invention, and FIG. 4 is a block diagram of the present invention. FIG. 7 is a block diagram showing a third embodiment of the invention. 1, 1A, 1B...Digital values to be stored,
2, 2A, 2B, 2C...D/A converter, 3, 3
A, 3B, 3C...Analog memory, 4, 4A,
4B, 4C...A/D converter, 5, 5A, 5B...
...reproduced digital value.

Claims (1)

[Claims] 1. Digital values to be stored include means for storing an analog value converted by a digital-to-analog converter in an analog storage device, and converting the analog value stored in the analog storage device into a digital value by the analog-to-digital converter. In a storage system equipped with means for duplicating values, some digits of the digital value to be stored are stored as digital values in a digital storage device, and the digital values of other digits are converted by a digital-to-analog converter. It is stored in an analog memory, and when reproducing it, the analog value in the analog memory is converted to a digital value by an analog-to-digital converter, and then the digits are combined with the output digital value of the digital memory to restore the original digital value. A storage method featuring analog/digital composite storage with reproduced digit division. 2 Divide the digital value to be memorized into arbitrary digits,
Convert it with a digital-to-analog converter that supports division, store it in multiple analog storage devices, and when reproducing it, read the analog value from each analog storage device and convert the analog value with each analog-to-digital converter. . The storage system according to claim 1, characterized by digit division analog storage in which digits of all output digital values are synthesized to reproduce the original digital value.