JPS60111398A - Memory system - Google Patents

Abstract

PURPOSE:To make a memory device simply constituted with one analog memory element by storing and accumulating a digital value to be stored in an analog memory device through a D/A convertor and by regenerating the original digital value through and A/D convertor conversely at the time of regenerating. CONSTITUTION:A digital value 1B to be stored is divided into the appropriate number of digits, and the upper rank digit, inter-mediate rank digit, and the lower rank digit are stored and accumulated in the 1st analog memory element 3A through the 1st D/A convertor 2A, the 2nd analog memory element 3B through the 2nd D/A convertor 2B, and the 3rd analog memory element 3C through the 3rd D/A convertor 2C, respectively. At the time of regenerating, a memory value of the 1st memory element 3A, that of the 2nd memory element 3B, and that of the 3rd memory element 3C are digital-synthesized from the 1st A/D convertor 4 to the upper rank digit of a regenerated digital value 5B, from the 2nd A/D convertor 4B to the intermediate rank digit of the regenerated digital value 5B, and from the 3rd A/D convertor 4C to the lower rank digit of the regenerated digital value 5B, respectively.

Description

[Detailed description of the invention] For details, see frequency, voltage, current, power, and gain.

In a device that stores time, angle, weight, speed, and other quantities, the quantity to be stored is set as a digital value, and the analog value obtained by passing the digital value through a digital-to-analog converter is stored and stored in an analog storage device. This is a storage method in which the values stored in the analog storage device are passed through an analog-to-digital converter to reproduce the required original digital values.

Frequency, voltage, current, power, gain 1 hour, angle.

Display values obtained by measuring natural phenomena such as weight and speed are analog values that indicate the state of continuously changing quantities at a certain moment. These analog values are now usually expressed in decimal digital format, and although the analog quantity itself contains an infinite amount of information, the displayed analog value is usually expressed in decimal digital format. The practical indication accuracy of conventional measuring instruments is about two or three decimal digits. Therefore, in the following explanation, the quantity itself will be described as an analog quantity, and the displayed value will be distinguished from an analog value.

Furthermore, as a memory device that stores and stores numerical values electrically, an analog memory device usually stores an analog quantity as a voltage or electric charge in a memory element, and during playback, this voltage or electric charge is measured to reproduce the analog value. It is composed of one memory element. However, since the voltage and charge in the memory element gradually decrease due to natural discharge, various measures have been devised and improved to regenerate and maintain this.

Digital storage devices are relatively easy to store because the digital values are binary values of 0 and 1, but they require storage elements equal to the number of digits of the digital value, and even if the same numerical value is a binary number, it is relatively easy to store it. Since decimal numbers have many more digits than decimal numbers, for example, to store a single decimal number, a digital storage device requires 4 digits (
There is a problem that a memory element of 4 bits is required.

Therefore, in the present invention, an analog value obtained by passing a digital value to be stored through a digital-to-analog (hereinafter referred to as D/A) converter is stored and stored in an analog storage device.
During reproduction, the original digital value is reproduced through an analog-to-digital (hereinafter referred to as ``digital'') converter. This storage device has the advantage that it can have an extremely simple structure consisting of one analog storage element. The storage precision of current analog storage devices is limited to two or three digits, whereas digital storage devices require 12 digital storage elements to store a three-digit decimal number. This proves the usefulness of the present invention, but considering that the memory accuracy of analog memory elements is in the process of being further improved in the future, the future prospects of the present invention are even more promising.

Furthermore, as mentioned earlier, the displayed values obtained by measuring natural phenomena are generally analog values, but recent electronic frequency measuring instruments, digital voltmeters, etc. have binary outputs in addition to decimal outputs. Furthermore, it is necessary to memorize and reproduce digital values for applications such as converting them to binary digital values, performing addition and subtraction with preset values, measuring the local oscillation frequency, and displaying the received frequency. There are many. The present invention has been made to meet such demands.

According to the present invention, as described above, the storage element is simplified compared to the digital storage system, but an extra false converter and stop converter are required. However, these converters are IC-based, inexpensive, and easily available, and the field of application differs depending on whether the conventional method or the present invention is adopted.
It is possible to achieve both depending on the purpose and use.

Since it is the fate of analog storage devices that the number of digits that can be stored is small, the present invention presents a first method to compensate for this in the second claim. That is, claim 1
Some digits of the digital value to be stored in the term are stored as digital values in the digital storage device, and the values of other digits are stored in the D/
The analog quantity obtained through the A converter is stored in an analog storage device, and when reproducing, the stored value in the analog storage device is restored to a digital value through a ψ converter, and then the stored digital value and digit are stored in the digital storage device. This is a storage method according to claim 1, in which the original digital values are reproduced by synthesizing the data. An example of the configuration will be illustrated and explained below.

FIG. 1 shows an example of the basic configuration of the storage system of the present invention, in which a digital value 1 to be stored is stored in an analog storage element 3 through a D/A converter 2 by a write command 31, and when reproduced, a read command is issued. 32 to the digital value 5 through the Φ converter 4
In principle, digital values 1 and 5 should match. However, analog storage elements have a limit on the number of digits that can be stored, and therefore there is a limit on the reproducible value.

FIG. 2 shows an application example of the present invention that corrects the above-mentioned weaknesses, in which the lower appropriate digits of the digital value IA to be stored are stored in the analog storage element 3 through the D/A converter 2, and when reproducing, Φ The digital value restored through the converter 4 is used as the lower digit, and the remaining upper digits of the digital value IA to be stored are stored in the digital storage device 6, and when reproduced, the upper digit of the digital value is restored in its memory form. It is necessary to digitally synthesize the restored lower digits and reproduce the digital value 5A, and as shown in FIG. The digital value restored through the φ converter 4 is used as the upper digit when it is stored in memory, and the lower appropriate digits of the remaining digital value IA to be stored are stored in the digital storage device 6, and when it is reproduced, the stored output is restored. The lower digits of the resulting digital value are digitally synthesized with the restored upper digits to reproduce the digital value 5A. As mentioned above, select either of the configurations shown in Figure 2, in which the lower digits of the digital value to be stored are stored in analog form, or the configuration in Figure 3, in which the higher digits of the digital value to be stored are stored in analog form, and multiply by the configuration of the digital value IA to be stored. It should be determined by considering the total number of digits and the importance of the upper and lower digits.

Furthermore, a second method for compensating for the small number of digits that can be stored in the analog storage element is presented in claim M3.

In other words, the analog storage device according to claim 1 is composed of a plurality of analog storage devices, divides the digital value to be stored into appropriate digits, performs D/A conversion, and then distributes it to the plurality of analog storage devices. This is a storage system according to claim 1, in which the original digital value is reproduced by synthesizing the digital values obtained by replacing N small amounts of the respective analog stored values when reproducing the analog stored values. FIG. 4 shows an example of its configuration.

In Fig. 4, the digital value IB to be stored is divided into appropriate digits (in the figure, it is divided into three parts: upper digit, middle digit, and lower digit), and the upper digit is passed through the first two D/A converters to the first The middle digits are stored in the second analog storage element 3B through the second D/A converter 2B, and the lower digits are stored in the second analog storage element 3A through the third D/A converter 2c. Memory is stored in the analog storage element 3C of No. 3. When reproducing, the stored value of the first storage element 3A is the digital value restored through the first A converter 4A, and the stored value of the second storage element 3B is the upper digit of the reproduced digital value 5B. ~Small meal changer 4
The stored value of the third storage element 3C reproduces the digital value restored through the third digital converter 4c.
The lower digits of B are digitally synthesized and reproduced. With this configuration, it becomes possible to store and reproduce digital values of necessary digits using the storage storage method in the analog storage element of the present invention.

In the above-mentioned FIGS. 2 to 4, circuits and operations corresponding to the write command and read command in FIG. 1 are omitted for the sake of clarity.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of the basic configuration of the storage system of the present invention, FIG. 2 is a block diagram showing an example of application of the invention, FIG. 3 is a block diagram showing another example of application of the invention, and FIG. The figure is a block diagram showing another example of application of the present invention. 1, IA, IB...Digital value to be memorized, 2゜2A
, 2B, 2C...D/A converter, 3, 3A
, 3B, , 3C...analog storage, 4, 4A,
4B, 4C... small dish changer, 5.5A, 5B... reproduced digital values. Patent applicant Yaesu Musen Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Example

Claims (3)

[Claims] (1) Frequency, voltage, current, power, gain 2 hours. In a device for storing angle 1 weight, speed, and other quantities, the quantity to be stored is set as a digital value, and an analog value obtained by passing the digital value through a digital-to-analog converter is stored and stored in an analog storage device, A storage method in which the stored value of the analog storage device is passed through an analog-to-digital converter to reproduce the required original digital value at the time of reproduction. (2) Some digits of the above digital value to be stored are stored as digital values in a digital storage device, and analog values obtained from other digits through a digital-to-analog converter are stored in an analog storage device. To reproduce the original digital value, the stored value in the analog storage device is restored to a digital value through an analog-to-digital converter, and the digits are combined with the digital value stored in the digital storage device to reproduce the original digital value. Storage method 0 according to claim 1 (3) The above-mentioned analog storage device is composed of a plurality of analog storage devices, and after dividing the digital value to be stored into appropriate digits and performing digital-to-analog conversion, the analog storage device is distributed to a plurality of analog storage devices for storage storage, 2. The storage method according to claim 1, wherein upon reproduction, the original digital value is reproduced by synthesizing digital values obtained by analog-to-digital conversion of each analog stored value.