JPS6050414A - Spectrum displaying device - Google Patents

Abstract

PURPOSE:To alleviate the load of computer programs, by connecting a reversible counter for moving a phase on a lateral axis to an address counter for an RAM, and moving the spectrum on a CRT screen to the right and left. CONSTITUTION:A transfer writing instruction part 7 is triggered by a flyback signal of a CRT and the transfer instruction is issued. Before the raster of the CRT reaches the left end of the spectrum display region, the contents of a reversible counter 5 are transferred to an address counter 2. When the transfer is finished, the reading of a video RAM1 is started at the transferred address. The contents of the RAM1 becomes the left end of the display on the CRT screen. When a moving clock 6 is operated and the contents of the reversible counter 5 are increased, the spectrum on the CRT screen is moved to the left. When the contents of the reversible counter is decreased conversely, the spectrum is moved to the right. Expansion and contraction of the displayed spectrum are performed by a variable-speed clock 8. Therefore the load of the computer programs is reduced.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention enables the spectrum on the CRT screen to be moved left and right in a CRT display using video RAM to display the spectrum, such as a multi-channel analyzer. The present invention relates to a spectrum display device.

<Prior Art> As a spectrum display device of this type, one shown in FIG. 1 has been used in the past. In the figure, 1 is a videotram that stores the content (spectrum) to be displayed on a CRT, and 2 is a CR
An address counter designates an address corresponding to the horizontal axis of T, 3 is a computer data bus, and 4 is a CRT display circuit. In this conventional device, the video RAM
The contents of I are all managed by a computer, and moving the spectrum left and right on the CRT screen is done by the computer sequentially rewriting the contents of RAMI from the beginning.

By the way, this method not only complicates the computer program software but also has the following display disadvantages. That is, the CRT has R corresponding to its scanning position.
I read the contents of the AMI and it is displayed, but in fact, one prefecture has R.
, AM cannot keep up with the scanning speed of the CRT and is partially delayed, resulting in jerky movement of the spectrum on the CRT screen and the inability to move the image smoothly.

<Purpose of the Invention> Therefore, the present invention makes it possible to move the spectrum without rewriting the contents of the video RAM, thereby reducing the burden on the computer program and making it possible to move the spectrum smoothly. It is.

<Structure of the Invention> To achieve the above object, the present invention provides an apparatus for displaying a spectrum on a CRT screen using a video RAM.
The address color of the video RAM is advanced in accordance with the scanning position of the CRT.
, is connected to a UF reverse counter for horizontal axis movement, so that the contents of this reversible counter can be transferred to the address counter immediately before or at the same time as the CRT scanning timing reaches the left edge of the screen, thereby reducing the contents of the reversible counter. The gist of this invention is to move the spectrum of the CRT screen from side to side by increasing or decreasing . Here, the left edge of the screen refers to the left edge of the area where the spectrum is displayed on the CRT. Therefore, just before reaching the left edge of the screen, C, RT
This means not only when the raster is retrace, but also while scanning to the left from the left edge of the spectrum display area. Also, "at the same time as it reaches the left end of both sides" means when the raster reaches the left end of the spectral display area.

<Embodiment> FIG. 2 shows an embodiment of the present invention, and the same circuits and parts as in FIG. 1 are given the same numbers. In the figure, 5 is the same as the address counter 2, 4 yellow axis movement + 17 "JJ' reverse counter, 6 is the movement clock for changing the contents of this reversible counter 5, and 7 is the reversible counter 5. A transfer read instruction section 8 is a variable speed clock for transferring the contents to the address counter 2 at a predetermined timing.This variable speed clock 8 not only generates a count clock for the address counter 2, but also expands the spectrum, which will be described later. ζ is used to reduce N.

The transfer read command unit 7 is configured to issue a transfer command when triggered by, for example, a return signal of a CRT. In this way, when the raster of the CRT is in front of the left end of the spectrum display area, the reversible counter 5
Transfer of the contents to address counter 2 is completed. When the transfer is completed, reading of the video RAMI will start from the transferred address, and that address RAMI will start from the transferred address.
The content becomes the left edge of the display on the CRT screen.

For example, when "10" is transferred from the reversible counter 5, the address counter 2 causes the reading of the video RAM 1 to start from the content stored at the 10th address. Further, when "20" is transferred from the reversible counter 5, reading of the video RAM starts from the content stored at the 20th address.

Therefore, if the moving clock 6 is operated to increase the content of the reversible color counter 5, the spectrum will move to the left on the CRT screen, and conversely, the content of the reversible counter 5 will be decreased. This means that it will move to the right.

In this case, the left and right movement of the spectrum is not jerky as in conventional devices, and IP can always be performed smoothly. The reason is that the spectrum can be moved by a quick method of transferring from a reversible counter to an address counter, rather than by the time-consuming method of rewriting the contents of the video RAM as in conventional devices.

Next, by changing the clock speed using the variable speed clock 8, the display spectrum can be expanded or reduced in the trIlI+h direction. For example, if the clock speed is halved, while the CRT raster is scanned from left edge to right edge, only half of the video RAM noatres will be designated, and the spectrum will be expanded by a factor of two. Conversely, doubling the clock speed will reduce the spectrum. Although such spectrum expansion and reduction are not directly related to the tree invention, by attaching a variable speed clock S to the device of the present invention,
It is significant to further expand and develop the usefulness of the device of the present invention. Note that as a method for varying the clock speed, there are appropriate methods such as changing the oscillation frequency of the CR oscillator or using a frequency divider.

<Effects of the Invention Since the spectrum display device according to the present invention is configured as described above, it has the following effects.

(2) Since the display spectrum can be moved without rewriting the contents of the video RAM by the computer, the burden on the computer program can be reduced.

Moreover, according to the present invention, it is not only possible to move only the spectrum (but also to move the cursor, marker, and window display for clearly indicating a part of the spectrum displayed on the CR'rvi surface).
ROI) etc. can also be moved together, so if this is taken into consideration, the burden on computer programs can be significantly reduced compared to the past.

■ Since the contents of the reversible counter are simply transferred to the address counter, the transfer can be performed in a much shorter time than the raster scanning time of a CRT. Therefore, the left and right movement of the spectrum on the CRT screen becomes extremely smooth, resulting in improved display quality. You can improve your skills.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional device, and FIG. 2 is a block diagram showing a spectrum display device as an embodiment of the present invention. 1 Video RAM, 2...Address counter, 5...
Reversible counter for horizontal axis movement.

Claims (1)

[Claims] When displaying a spectrum on a CRT screen using a video RAM, a reversible counter for horizontal axis movement of the same capacity is connected to an address counter that advances the address of the video RAM in accordance with the scanning position of the CRT. CR
The content of the reversible counter is configured to be transferred to the clothing address counter immediately before or at the same time as the scanning timing of T reaches the left edge of the screen, and the content of the reversible counter is increased or decreased.
A spectrum display device characterized by moving the spectrum on the screen from side to side.