JPH10253673A - Spectrum display method and spectrum analyzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable expansive and contractive displays in an immovable set position by obtaining an offset amount from the set information of a specified level position, multiplying a difference signal between a DC signal from a frequency converter part and the offset amount by an amplification set value and adding the offset amount to tha product. SOLUTION: A position level is figured out as a predetermined offset amount 11of by receiving the set information of a specified level position on the display pipe surface. An offset subtraction part subtracts the predetermined offset amount 11of from an analog DC signal. A multiplication part multiplies the subtracted difference signal 10b by an amplification set value corresponding to the predetermined resolution setting of a display on the pipe surface. An offset addision part adds the predetermined amount 11of to the product to send the sum to an A/D converter. Thus, the set position is kept immovable so that a display spectrum can be expanded or contracted. Hence, the expansion and contraction in the specified level position on the pipr surface are facilitated extremely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an enlarged or reduced display method for displaying a spectrum screen.

[0002]

2. Description of the Related Art The prior art will be described with reference to an example of the configuration of a general spectrum analyzer shown in FIG. 7 and an example of a spectrum display in which a specified level position is immobilized and enlarged in FIG. In general, a spectrum analyzer has a key switch for setting various conditions and a rotary knob for moving a cursor position or a marker position, and these are operated and used. The configuration includes a frequency conversion unit 60, a gain conversion unit 50b, an AD converter 75, an arithmetic control unit 80, and a display device 90. The gain conversion unit 50b includes a multiplication unit 54
And a DA converter 59.

First, an operation procedure for enlarging and displaying a spectrum level so that a designated level position 10 on the screen shown in FIG. 3 does not move at that position will be described. here,
It is assumed that a marker is previously provided at a designated level position 10 on the screen with a rotary knob or the like. The enlarged display operation is performed from this point. As the first step, for example, a Y-axis scale of 10 dB / Div. Shown in FIG. Is 2 dB / Div. Shown in FIG. The setting is changed to a predetermined resolution 12, which is the Y-axis scale of the step. At this time, since the reference level at the upper end of the screen level is -40 dBm, which is the same as in FIG. 3A, the spectrum disappears from the display screen and is not visible at all. Before this operation, the designated level position 10
(About -70 dBm position). As a second step, a setting operation is performed by inputting a numerical key so that the value of -64 dBm obtained by adding 6 dB to this value is set as the reference level such that the above-mentioned -70 dBm position where the reference level is memorized is at the center. As a result, FIG.
The spectrum screen shown in (b) is displayed.

As described above, there are disadvantages that there are many key operation steps in order to change to a desired display screen, and there is also a disadvantage that the spectrum temporarily disappears from the screen during the operation. In addition, the line of sight is removed from the screen for key operation, which is not preferable from an ergonomic point of view. Therefore, it is difficult for the operator to concentrate on observing the spectrum of interest. Further, every time the Y-axis scale sensitivity is changed, the same operation has to be repeated, which is inconvenient in operation.

[0005] Second, an operation procedure for enlarging and displaying the designated section area 20 of FIG. 4 over the entire tube surface will be described. Here, it is assumed that the partitioned area 20 is designated in advance by a rotary knob or the like. From this point on, the enlargement operation to the entire tube surface is performed. As a first step, the Y-axis scale section 25 of the partitioned area 20 shown in FIG.
/ Div. To change the resolution of the Y-axis scale.
At this time, the reference level at the upper end of the screen level is as shown in FIG.
Since it is the same as −60 dBm, the partitioned area 20
The spectrum has disappeared and cannot be seen.
Before this operation, the Y-axis scale section 2 of the partitioned area 20 is set.
5 It is necessary to obtain the level value of the upper end by calculation (about -104 dBm position) and remember the level value. As the second step,
A setting operation using the remembered value of about -104 dBm as a reference level is performed by inputting numerical keys. As a result,
A spectrum in which only the Y-axis scale section 25 is enlarged is displayed. As the third step, the divided area 2
0 frequency axis scale section 35 start frequency 31low,
The end frequency 32hi is estimated to be, for example, 930 MHz, 95
Change the setting to 0 MHz. As a result, FIG.
As shown in (b), the Y axis scale section 25 and the frequency axis scale section 35 are enlarged and displayed on the entire screen. As described above, the operation of enlarging and displaying the partitioned area 20 over the entire tube surface requires more operation procedures, has the disadvantage of further complicated operations, and has been inconvenient in practical use.

[0006]

The problem to be solved by the present invention is to provide a control means for facilitating the operation input in the enlarged or reduced display of the spectrum screen and to provide the convenience of the enlargement / reduction operation. The purpose is to improve.

[0007]

FIG. 1, FIG. 2, and FIG. 3 show a solution according to the present invention. First, in order to solve the above problem, in the configuration of the present invention, upon receiving the setting information of the designated level position 10 on the display screen, the position level is calculated as a predetermined offset amount 11of, From the analog DC signal 71dc by the predetermined offset amount 11of, and the difference signal 10b
The multiplication signal is multiplied by an amplification setting value 13 mul corresponding to the predetermined resolution 12 setting of the display on the screen, and the multiplied signal is added thereto, and a predetermined offset amount 11of is added and supplied to the AD converter 75. A display method for enlarging or reducing the display spectrum while maintaining immovability is adopted. Thereby, in the reduced display at the designated level position 10 on the display screen, the enlargement / reduction becomes extremely easy.

FIG. 4 and FIG. 6 show a solution according to the present invention. Second, in order to solve the above-mentioned problem, in the configuration of the present invention, receiving the setting information of the designated section area 20 on the display screen, calculating the level of the section center as the predetermined offset amount 11of, and performing frequency conversion. The analog DC signal 71dc from the unit 60 is subtracted by the predetermined offset amount 11of, and the difference signal 10b thus subtracted is received.
Amplification setting value 1 that expands the upper and lower level sections of 0 over the entire screen
3mul is calculated, multiplied by an amplification setting value, and output. The multiplied signal is received, and a predetermined offset amount 11of is added to Amul.
This is supplied to the D converter 75 and the sweep control is performed with the divided area 20 as a frequency span, whereby the display spectrum of the set divided area 20 is enlarged and displayed on the entire screen.
This makes it very easy to zoom in / out the intended partitioned area 20 in displaying the spectrum screen.

FIG. 1, FIG. 2, FIG. 3, and FIG. 5 show a solution according to the present invention. Third, in order to solve the above problem, in the configuration of the present invention, the setting level of the designated level position 10 on the display screen is received, the level of the position is obtained as the predetermined offset amount 11of, Is converted to the predetermined offset amount 1
An offset subtraction unit 52 that subtracts 1of, a multiplication unit 54 that receives the difference signal 10b subtracted by the above, multiplies the amplified signal by an amplification setting value 13mul corresponding to a predetermined resolution 12 setting on the display screen, and outputs the multiplied signal. Receiving, predetermined offset amount 1
The offset adding section 56 supplies an analog signal obtained by adding 1of to the AD converter 75. Thereby, in the enlarged / reduced display of the spectrum screen having the frequency converter 60 for sweep measurement and the AD converter 75 for quantizing and converting the detected analog DC signal of the spectrum level into digital data, the designated level position 1 on the screen is displayed.
By simply designating 0, a zoom function of maintaining the position and enlarging / reducing can be realized with good operability.

FIG. 4, FIG. 5 and FIG. 6 show a solution according to the present invention. Fourth, in order to solve the above-described problem, in the configuration of the present invention, upon receiving the setting information of the designated section area 20 on the display screen, the level of the center of the section is obtained as the predetermined offset amount 11of, The analog direct current signal 71dc from the predetermined offset amount 11
In response to the offset subtraction unit 52 that subtracts the of signal and the difference signal 10b that has been subtracted as described above, an amplification setting value 13mul that expands the upper and lower level sections of the partitioned area 20 over the entire display screen is obtained, multiplied by the amplification setting value, and output. A multiplying unit 54, and an offset adding unit 56 that receives the multiplied signal and adds an analog signal obtained by adding a predetermined offset amount 11of to an AD converter 75.
And a sweeping control of the frequency conversion unit 60 using the frequency axis scale section of the partitioned area 20 as the frequency span of the frequency axis. Accordingly, in the display of the spectrum screen including the frequency converter 60 for performing the sweep measurement and the AD converter 75 for quantizing and converting the detected analog DC signal of the spectrum level into digital data, only the partitioning of the target partitioning area 20 is designated. Thus, a zoom function with good operability can be realized.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings together with embodiments.

(Embodiment 1) In the embodiment of the present invention, a main part configuration diagram of a spectrum analyzer in FIG. 1, an operation explanatory diagram of a gain / offset converter in FIG. 2, and a spectrum obtained by enlarging a Y-axis scale in FIG. An example and the gain
An example in which the spectrum level is enlarged / reduced so that the designated level position 10 on the display screen is fixed at the display position will be described with reference to the internal configuration diagram of the offset conversion unit.

As shown in FIG. 1, the main components of the spectrum analyzer of the present invention are a frequency conversion unit 60, a gain / offset conversion unit 50, an AD converter 75, an operation control unit 80, a display device 90 And This configuration is the same as the conventional configuration except for the gain / offset converter 50 and the arithmetic controller 80.

The gain / offset conversion unit 50 adjusts the display position of the designated level position 10 on the display screen shown in FIG. 2A, for example, so that the designated level position 10 does not move as shown in FIG. 2C. It expands and reduces the size of the image. In other words, only the portion excluding the desired offset after receiving the analog DC signal 71dc from the frequency conversion unit 60 is enlarged / reduced and amplified in accordance with the predetermined resolution 12 of the display on the screen. The designated level position 10 on the screen and the predetermined resolution 12 of the screen display are set conditions given by the operator. The setting of the information of the designated level position 10 is given by a position designating means described later. This will be described with reference to a calculation formula. First, analog DC signal 71dc = offset amount 1
It is assumed that the element component is 1of + the difference amount 71diff. In this case, at the designated level position 10, the difference amount 71diff is naturally zero. It is also assumed that the amplification value corresponding to the predetermined resolution 12 given by the setting conditions for enlargement / reduction of the display on the screen is the amplification setting value 13mul. Here, the predetermined resolution 12
Is usually 1, 2, 5, 10 dB / Div. Since the resolution range is displayed in steps, the amplification setting value 13mul is a corresponding magnification setting value. As a result, the resolution enlargement / reduction level signal 51 amplified and output by the gain / offset converter 50 is output.
= ｛(Analog DC signal 71dc-offset amount 11of)
× Amplification setting value 13mul｝ + offset amount 11of) The amplification and output of the DC signal are performed.

Next, a specific internal configuration example of the gain / offset converter 50 shown in FIG. 1 for performing the amplification will be described. As shown in FIG. 5A, the configuration includes an offset subtraction unit 52, a multiplication unit 54, an offset addition unit 56, and DA converters 58 and 59. In this configuration, the multiplier 54 and D
The A converter 59 is the same as the conventional one. The offset subtraction unit 52 receives the analog DC signal 71dc from the detection unit 70, and obtains a predetermined offset amount 11of corresponding to the level of the designated level position 10 shown in FIG. Then, a difference signal (71dc-11of) between the two signals is output. The signal 10 in FIG.
"b" indicates a state in which the offset has been shifted by the actual subtraction.
The multiplication unit 54 receives the difference signal 10b, receives the amplification setting value 13mul corresponding to the predetermined resolution 12 setting of the display on the screen, and multiplies the two by a multiplication signal ｛(71dc−11of) × 1.
Output 3mul｝. 2B is a signal multiplied by the signal 10c, and only the signal excluding the offset is enlarged /
This shows a state of being reduced and amplified. Offset adder 5
6 receives the multiplied signal, receives the predetermined offset amount 11of, adds the both, and adds a resolution scaling signal 51 =
{(71dc−11of) × 13mul} + 11of is output. The signal 10d in FIG. 2C shows this output signal state. As a result, the designated level position 1 shown in FIG.
It can be seen that 0 is a display signal that is enlarged / reduced in the immobile state even in the converted signal 10d of FIG.

The arithmetic control unit 80 shown in FIG. 1 controls the gain / offset converter 50 in addition to the conventional arithmetic control to perform an arithmetic process for displaying a desired display on the screen. Specifically, as the arithmetic control according to the present invention, first, information on a designated level position 10 on the display screen is received from the operator, and the input level of the input terminal of the AD converter 75 corresponding to this level position is offset. 11of, and the DA converter 58
The predetermined offset amount 11of is supplied via the. Second, Y
The amplification setting value 13mul, which is the resolution of the axis scale, receives the predetermined resolution 12 information of the display on the screen by, for example, a key input setting from the operator, and receives the Y-axis scale (for example, 1) on the screen corresponding to the input setting. , 2,5,10dB / Di
v. ) Is calculated and supplied to the multiplier 54 via the DA converter 58. Note that the calculation of the amplification setting value 13mul is the same as in the related art. It should be noted that, besides the direct setting input of the range numerical value by the numerical key input from the operator, an up / down zoom operation for enlarging or reducing at a desired step (1, 2, 5, 10) by inputting an up / down key is also possible. good.

According to the configuration of the present invention, there is obtained an advantage that the designated level position 10 on the display screen can be designated and the designated level position 10 can be fixed on the screen. There is an advantage that a zoom function for enlarging / reducing the spectrum level centered on the image can be realized. For example, as an example of the enlarged zoom at the designated level position 10 in FIG. 3A, an example of a state in which the Y axis scale is enlarged from 10 dB / Div to 2 dB / Div shown in FIG. 3B is shown. As described above, in the present invention, since the display is performed with the target observation point as the center, the advantage that the viewpoint does not move is obtained, the error of overlooking the attention point is eliminated, and the designated level position 10 in repeated zooming is eliminated.
There is also an advantage that it is not necessary to specify again, and the zoom operation focusing on the point of interest can be easily performed. As a result, there is an advantage that the operator can enjoy more convenience.

As described above, according to the present invention, the spectrum level is enlarged so that the designated level position 10 or the designated designated point on the display screen is received and the designated level position 10 is immovable on the screen. -The zoom method is used to reduce the display.

As a position designation means for giving the designated level position 10 on the screen, an existing marker (a pointer that moves on the envelope of the spectrum or a pointer that moves on the spectrum peak) of the spectrum analyzer is used. There are examples of using as input information and examples of using an arbitrary pointer that can freely designate a point on the screen as input information. With these position designation means, the operator
A desired designated level position 10 is set.

(Embodiment 2) An embodiment of the present invention will be described with reference to FIG. 6 showing a main part configuration of a spectrum analyzer and FIG. The present invention is an example in which, in the spectrum of the signal to be measured 100 on the display screen, both the Y-axis scale direction and the horizontal frequency axis direction of the designated partitioned area 20 are enlarged and displayed on the entire display screen.

The gain / offset converter 50 shown in FIG.
Performs amplification for enlarging and displaying the Y-axis scale over the entire tube surface, which is the same as in the first embodiment. That is, FIG.
FIG. 4 (b) shows a portion obtained by removing the predetermined offset amount 11of from the analog DC signal 71dc in order to enlarge the Y-axis scale to the entire display surface in the display designated section 20 on the display surface shown in FIG. Are amplified in accordance with the predetermined resolution 12 shown in FIG. Specifically, the midpoint position 20ctr of the designated divided area 20 shown in FIG.
The predetermined resolution 12 at which the Y-axis scale section 25 of the divided area 20 is the upper and lower limits of the screen display is calculated, and the corresponding amplification setting values 13mul are calculated and set, respectively.
The analog DC signal 71dc is amplified in the same manner as in the first embodiment.

In order to enlarge and display the other horizontal frequency axis direction on the entire screen, it is necessary to control so as to sweep the frequency span section shown in FIG. Specifically, the sweep setting of the frequency conversion unit 60 is controlled so that the start frequency 31low and the end frequency 32hi of the designated horizontal frequency axis scale section 35 of the partitioned area 20 have a frequency span. As a result, as shown in FIG. 4 (b), for example, the designated partition area 20 is enlarged and displayed on the entire screen surface by operating the up key. Note that the screen display conditions immediately before the enlarged display may be stored so that the current enlarged display state can be returned to the original reduced screen state by operating a down key, for example. Further, the screen display conditions for the enlarged display are stored each time, and the convenience of the operability is measured so that the display can be switched at any time by operating the up / down keys in both the previous enlargement and reduction zoom. Is also good.

As described above, the present invention employs a technique of receiving setting information of a designated section area 20 on the display screen and enlarging and displaying this section area 20 on the entire screen. A means for storing the history of previous screen display conditions may be provided, and a history state display means for easily returning to the previous screen display size may be added.

According to the configuration of the invention described above, the signal under test 10
By specifying the focused section area 20 on the screen on which the spectrum analysis of 0 is desired to be performed, there is an advantage that the enlargement / reduction zoom function with good operability can be realized. The designated level position 10 on the display screen and the display designation section area 20 on the screen set in the above embodiment are set by a rotary knob, a key switch, a cursor key or the like of the apparatus. An input device such as an interface or a touch panel may be provided, and the apparatus may be configured to specify a position by this operation.

In the configuration of the gain / offset converter 50 shown in FIG. 5A in the above embodiment, instead of this configuration, as shown in FIG. 5B, a multiplier 54 and an offset subtractor 57 are provided. The configuration may be such that the arithmetic control unit 80 calculates the offset data 11dat to be given to the DA converter 58 at a ratio of {11of × (13mul−1)} by the arithmetic control unit 80 and provides the offset data 11dat to the DA converter 58, 59. It can be implemented in a similar manner.

Although the above embodiment has been described with reference to a specific example in which the circuit of the gain / offset converter 50 shown in FIG. 5A is provided and implemented, the offset subtractor 52 and the offset adder 56 are provided. Instead, there is a means to zoom in software. In this case, the arithmetic control unit 80 receives the measurement data subjected to the AD conversion by the AD converter 75 without changing the setting conditions for the multiplication unit 54 having the conventional configuration, and the arithmetic control unit 80 performs the zoom arithmetic processing corresponding to the gain / offset conversion unit 50. . With this soft zoom method, when the zoom magnification is large, the spectrum display becomes coarse and waveform analysis may be difficult, but under finite zoom conditions, there is no need to add a circuit, so it is inexpensive. There are realizable advantages.

In the above embodiment, a specific example of enlarging or reducing the spectrum display of the spectrum analyzer has been described. However, it is apparent that the present invention can be similarly applied to a network analyzer.

[0028]

According to the present invention, the following effects can be obtained from the above description. In the first embodiment, the designated level position 10 on the display screen is designated.
Can be immobilized on the screen, and an advantage of realizing a zoom function for enlarging / reducing a spectrum level centering on a point of interest to be analyzed can be obtained. Therefore, since the display is centered on the target observation point, the advantage of eliminating the gaze movement associated with the complicated numeric key input as in the past can be obtained. Level position 1
The advantage that the re-designation of 0 is not required is also obtained, and the zoom operation focusing on the point of interest can be easily performed. As a result, there is an advantage that the operator can enjoy the convenience of the zoom operation which is easy to concentrate on the spectrum observation.

In the second embodiment, the designated section area 20 is enlarged and displayed on the entire screen while watching the screen. Also in this case, since the section can be easily designated and set while looking at the screen, there is an advantage that the setting operation is easy. Further, since the target area can be specified on the screen while observing the situation of the spectrum signal under test changing every moment, there is an advantage that the target area can be easily specified. In the case where the screen display condition storage means immediately before the enlarged display is provided, there is obtained an advantage that it is possible to easily return from the enlarged display state to the original reduced screen state. Is provided each time zooming is performed, the two-way operability of the previous enlargement or reduction zoom display is simplified, and the convenience is further improved.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram of a spectrum analyzer according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating the operation of a gain / offset converter according to the first embodiment of the present invention.

FIG. 3 shows a Y-axis scale of 10 dB / in the first embodiment of the present invention.
8A and 8B are an example of Div and an example of a spectrum enlarged and zoomed to 2 dB / Div.

FIG. 4 is a display explanatory diagram of an example of a section zoom according to the second embodiment of the present invention.

FIG. 5 is an internal configuration diagram of a gain / offset conversion unit according to the present invention.

FIG. 6 is a configuration diagram of a main part of a spectrum analyzer according to a second embodiment of the present invention.

FIG. 7 is a configuration example of a main part of a conventional general spectrum analyzer.

[Explanation of symbols]

 10 Designated level position 11of Predetermined offset amount 13mul Amplification setting value 20 Partition area 25 Y axis scale section 35 Frequency axis scale section 50 Gain / offset conversion section 50b Gain conversion section 52, 57 Offset subtraction section 54 Multiplication section 56 Offset addition section 58, 59 DA converter 60 Frequency converter 70 Detector 71dc Analog DC signal 75 A / D converter 80 Arithmetic controller 90 Display device 100 Signal under test

Claims (4)

[Claims] In a display of a spectrum screen, receiving setting information of a specified level position on a display screen, calculating a level of the position as a predetermined offset amount, and converting an analog DC signal from a frequency conversion unit to the predetermined level. The difference signal is subtracted by the offset amount, the difference signal is subtracted by the above, multiplied by the amplification setting value corresponding to the predetermined resolution setting of the display on the screen, and the multiplied signal is received, and the predetermined offset amount is added and
A spectrum display method, comprising: supplying a D spectrum to a D converter; and displaying the display spectrum in an enlarged or reduced manner while keeping the set position unchanged. 2. Displaying a spectrum screen, receiving setting information of a designated section area on a display screen, calculating a level at the center of the section as a predetermined offset amount, and converting an analog DC signal from a frequency conversion section into Receiving the difference signal subtracted by the predetermined offset amount, calculating the amplification set value for enlarging the upper and lower level sections of the partitioned area to the entire screen, and multiplying by the amplification set value and outputting; Upon receiving the multiplied signal, a predetermined offset amount is added and A
A spectrum display method comprising: supplying a divided area as a frequency span to a D-converter; and performing a sweep control so as to enlarge and display a display spectrum of the set divided area over the entire screen. 3. A display for displaying a spectrum screen having a frequency converter for sweeping measurement and an AD converter for quantizing and converting the detected analog DC signal of the spectrum level into digital data, wherein setting information of a designated level position on a display screen is provided. Receiving the level of the position as a predetermined offset amount, an offset subtraction unit for subtracting the analog DC signal from the frequency conversion unit by the predetermined offset amount, and receiving the difference signal subtracted in the above manner, A multiplying unit that multiplies and outputs an amplification setting value corresponding to a predetermined resolution setting, and an offset adding unit that receives the multiplied signal and supplies an analog signal obtained by adding a predetermined offset amount to an AD converter. A spectrum analyzer characterized by the following. 4. A display for displaying a spectrum screen having a frequency conversion unit for sweeping measurement and an AD converter for quantizing and converting a detected analog DC signal of a spectrum level into digital data, wherein a designated area on a display screen is set. Receiving the information, obtaining the level at the center of the section as a predetermined offset amount, an offset subtracting section for subtracting the analog DC signal from the frequency conversion section by the predetermined offset amount, A multiplication unit for obtaining an amplification setting value for expanding the upper and lower level sections of the region to the entire screen, multiplying the amplification setting value and outputting the multiplication signal, and AD converting the analog signal obtained by receiving the multiplication signal and adding a predetermined offset amount thereto Offset adding section to be supplied to the frequency converter, and sweeping the frequency conversion section using the frequency axis scale section of the defined area as the frequency axis frequency span. Gyoshi, spectrum analyzer was characterized by including the above.