JP2993519B2 - Sensor reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a sensor reader that converts a signal from a sensor into a digital signal by a plurality of A / D converters and stores the converted signal in a memory, and converts an analog signal from a sensor group into a plurality of A / D converters. Multiple sensor elements that detect the image of a certain area as an analog signal with the purpose of changing the order of input to the device, making the data read out regular, improving the processing speed by simplifying the processing when storing the data in the memory, and The output signal lines of each sensor were connected to multiple A / D converters for a sensor group in which multiple sensors with Digital signals are sequentially fetched, and these fetched signals are sequentially stored at fixed offset positions in the memory corresponding to the predetermined number of sensor elements.

[Industrial applications]

The present invention relates to a sensor reading device that converts a signal from a sensor into a digital signal by a plurality of A / D converters and stores the converted signal in a memory.

[Problems to be solved by conventional technology and invention]

Conventionally, an analog signal detected by a sensor group 21 arranged in an array as shown in FIG. 5 is converted into a digital signal using a plurality of A / D converters 22 and read out at high speed. At this time, since the conversion speed of the A / D converter 22 itself is lower than the detection speed of the sensor group 21, (AD2), (A
D3), (AD1), (AD4), followed by (AD2), (A
D3), (AD1), and (AD4), the signals converted into digital signals by the respective A / D converters 22 are read one by one and stored in the memory. However, there is a problem in that the data needs to be generated by a complicated process, and much time is required for data processing.

The present invention uses a plurality of A /
It is an object of the present invention to change the order of input to the D-converter so that data to be read is made regular, to simplify processing when storing the data in a memory, and to improve the processing speed.

[Means for solving the problem]

Means for solving the problem will be described with reference to FIG.

In FIG. 1, a sensor group 1 includes sensor elements that detect an image of a certain area as an analog signal in a row.

The A / D converter 2 converts an analog signal from the sensor group 1 into a digital signal.

[Action]

As shown in FIG. 1, the present invention relates to a sensor group 1 in which sensor elements for detecting an image of a certain area as an analog signal are successively arranged. The digital signals converted by the plurality of A / D converters 2 are sequentially fetched and sequentially stored at fixed offset positions in a memory corresponding to a predetermined number of sensor elements. Like that.

Therefore, the analog signal from the sensor group 1 is transmitted to a plurality of A /
By changing the order of connection to the D converter 2, the data to be read can be made regular, so that the processing for storing the data in the memory can be simplified and the processing speed can be improved.

〔Example〕

Next, the configuration and operation of one embodiment of the present invention will be sequentially described in detail with reference to FIGS.

In FIG. 1, a sensor group 1 includes eight sensor elements A to H each having a group of eight sensor elements for detecting an image of a minute area above a read medium as an analog signal (the total number is 64).
And a sensor group A including eight sensor elements for detecting, as an analog signal, an image of a small area below the medium to be read.
To H (the total number is 64) and a light emitting unit (not shown). One of these sensor groups A to H is selected by a multiplexer to correspond.
Input to the A / D converters (1) to (4), and each of the A / D converters (1) to (4) selects one of the four inputs to convert analog signals to digital signals. And output it.

The A / D converter 2 converts one selected from the four analog signals input through the multiplexer into a digital signal. At this time, the order of the sensor groups is changed and input to the A / D converter 2 as shown in FIG. As a result, as described later, a signal obtained by converting an analog signal from the sensor element of the corresponding sensor group into a digital signal is read from the A / D converter 2 in the following order: It can be stored by simple offset processing.

 FIG. 2 shows a system configuration diagram of the present invention.

In FIG. 2, sensor groups 1-1 and 1-2 are for reading an image on the upper side of the medium to be read in FIG. 1, and sensor groups 1-3 and 1-4 are for lower side of the medium to be read in FIG. Is to read the image of.

The multiplexers 3-1 to 3-4 correspond to the multiplexer in FIG.

The amplifier circuits 4-1 to 4-4 are connected to the multiplexer 3-
This is to amplify the analog signal selected by 1 to 3-4.

The four-channel A / D converter 2-1 incorporates four of the A / D converters 2 in FIG.

The data processing unit 5 performs data processing on a signal converted into a digital signal by the 4-channel A / D converter 2-1.

The CPU 7 performs various controls according to programs.

Next, in the order shown in the flowchart of FIG.
The operation of the configuration shown in FIG. 1 will be specifically described with reference to the drawings. This flowchart is for one of the sensor groups A to H on the upper side (or lower side) in FIG. 1. Here, the case of the upper sensor group A to H will be described.

In FIG. 3, the initial value D of the memory storage start address is set (the start address D of the memory 6 in FIG. 4), and the initial value 0 is set at the position (0 to 7) A in the sensor group (the start of each sensor group). ), And memory storage offset C
Is set to the initial value 0.

Assigns the value of D + A to the base register B. This is because a value obtained by adding the memory storage head address initial value D and the sensor group position A to a base register B that holds an address for writing data obtained by converting a signal from the sensor group into a digital signal into the memory 6 ( Address).

Captures one byte of data. This is shown in FIG.
It takes in one (1 byte) data from any one of the D converters 2, for example, a sensor group.

Is stored in the memory address B + C × 16. That is, the 1-byte data fetched is stored at an address obtained by adding a base address and a memory storage offset C × 16. More specifically, data from the position of the sensor group H is stored at the address position in FIG. Here, 16 is a fixed offset as shown in FIG. 4, and is an offset address between FIG. 1 and FIG.

Substitutes the value of (C + 1) for the memory storage offset C.

Determines whether the memory storage offset C = 3. That is, it is determined whether or not the memory storage offset C = 3, that is, the data has been stored in the memory one by one up to the position in FIG. In the case of YES, the position in the sensor group is set to A ← A + 1, and the setting is made so as to perform or not for the next sensor group. On the other hand, in the case of NO, the data of the next sensor group is stored in the memory.

Determines whether the in-sensor position A = 7. This is to determine whether or not the sensor position A = 7, that is, whether or not all the data from all the sensor groups have been stored in the memory. If YES, end (END). In the case of NO, the above processing is repeated.

By the above processing, the data from the sensor group at the positions of FIG. 1,... Are sequentially stored in the memory 6 of FIG.

The upper sensor group 1 and the lower sensor group 1 in FIG.
4 are stored in the memory 6 in the following order in the following order, the lower first offset 16/2 = 8, and thereafter the data is sequentially shown at the same fixed offset 16 as shown in the figure. May be stored. In FIG. 1, two A / D converters 2 are arranged on the upper side and the lower side,
Even if three, four, five,... Are arranged, data may be sequentially stored in the memory at a fixed offset.
In addition, as a medium to be read in FIG. 1, images of minute areas on both sides are read at high speed when discriminating bills, checks, and the like.

〔The invention's effect〕

As described above, according to the present invention, a configuration is adopted in which the order in which analog signals from the sensor group 1 are connected to the plurality of A / D converters 2 is exchanged to regularly read data. In addition, the processing for storing the read data in the memory can be simplified, and the processing speed can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. FIG. 2 is a block diagram of the system of the present invention. FIG. 3 is a flowchart for explaining the operation of the present invention. Shows an explanatory diagram of the prior art. In the figure, 1: sensor group 2: A / D converter 6: memory or: order in which signals read from sensor elements are stored in memory

Claims (2)

(57) [Claims] 1. A sensor reading device for converting a signal from a sensor into a digital signal by a plurality of A / D converters and storing the converted signal in a memory, comprising: a plurality of sensors having a plurality of sensor elements for detecting an image of a certain area as an analog signal; A plurality of A / D converters (2) connecting the respective output signal lines of the plurality of sensors for the sensor group (1) arranged in series, and a plurality of these A / D converters (2) Means for sequentially fetching the converted digital signals of the plurality of sensors, and sequentially storing these fetched signals at a fixed offset in a memory corresponding to the predetermined number of sensor elements and at a position determined by a position in the sensor group. A sensor reading device, comprising: 2. A sensor group in which a plurality of sensors each having a plurality of sensor elements for detecting an image of a certain area as an analog signal are continuously arranged, and a signal from the plurality of sensors is converted into a digital signal. An A / D converter for outputting to the device, enabling a sensor element of a predetermined sensor in the sensor group, outputting an analog signal to the A / D converter, and outputting a digital signal by the A / D converter. A sensor reading device for reading an image in a certain area by sequentially changing a sensor element that enables an operation of converting into a sensor, wherein adjacent sensors are connected to different A / D converters.