JPH11304854A - Spectrum analyzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spectrum analyzer, capable of performing data search for a limited range by simultaneously designating plural frequency zones in a measuring frequency range. SOLUTION: This spectrum analyzer for frequency sweeping through digital control is provided with a range designating means 73 to mask and designate frequency zones not subject to data search, a waveform data operation part 52 for waveform data processing based on the designated range by the range designating means 73, a processing means 72 for data search based on data generated by the waveform data operation part 52, and designated zone data by the range designating means 73, and a memory part 71 for memorizing the designated range data and search data processed by the processing means 72.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectrum analyzer capable of masking a plurality of frequency bands.

[0002]

2. Description of the Related Art The configuration and operation of an example of the prior art will be described with reference to FIGS. 6 and 7. FIG. As shown in FIG. 6, a conventional spectrum analyzer includes a frequency converter 1
0, an IF filter unit 20, an IF amplification unit 30, a detection unit 40, a data processing unit 50, a display unit 60, a control unit 70, a setting input unit 80, and a sweep signal generation circuit 90. doing.

[0003] An input signal is input to a frequency conversion unit 10.
The frequency of the local oscillator 12 is mixed with the mixer 11 and
Convert to F frequency. The IF frequency is set to the IF filter unit 2
After the band is limited to 0, the signal is amplified by the IF amplifier 30, detected by the detector 40, converted into a digital signal, and processed by the data processor 50. The detected signal converted into the digital signal is stored in the trace memory 51,
In step 2, a calculation is performed using the parameters of the control unit 70, and the calculated value is displayed on the display unit 60 as a signal level with respect to the frequency axis.

The measured frequency range is, for example, a center frequency and a frequency span inputted by the setting input means 80, becomes parameters processed by the processing means 72 of the control section 70, and stores the result calculated by the waveform data calculating section 52 in the storage section. 71. Further, in the designated measurement frequency range, a sweep signal is generated from the sweep signal generation circuit 90 according to the parameters processed by the processing unit 72 of the control unit 70, and the sweep signal is provided to the local oscillation unit 12 of the frequency conversion unit 10. This determines the sweep range.

Next, a description will be given of a case where a measurement is performed by designating a frequency band on a measurement screen. For example, as shown in FIG. 7A, when data is searched for spurious levels other than harmonics in the measurement frequency range f1 to f4, f
The frequency band of 2 to f3 is measured by the window function. Here, the window function is a function capable of performing a sweep within a frequency band of a designated window and a peak search by displaying a marker. By using the window function, high-speed measurement can be performed while observing a wide span.

However, as shown in FIG. 7 (b), when there is a harmonic between spurious components, only one window function can be used. There is a need to. In order to simultaneously specify a plurality of windows, program processing is required when windows overlap, but the processing method in that case is difficult and there is no embodiment.

[0007]

As described above, when there is a harmonic between spurious components, only one window can be specified, and measurement is performed by specifying the window range in two steps. And there are practical inconveniences such as a long measurement time. Therefore, the present invention has been made in view of such a problem, and an object of the present invention is to provide a spectrum analyzer that can perform data search in a limited range by simultaneously specifying a plurality of frequency bands in a measurement frequency range. is there.

[0008]

That is, a first aspect of the present invention, which has been made to achieve the above object, is to provide a spectrum analyzer which can designate a frequency band as a mask and retrieve data only in a limited frequency range. I have.

In order to achieve the above object, a second aspect of the present invention is to provide a spectrum analyzer which performs frequency sweep by digital control, a range designating means for masking a frequency band to be excluded from data search, A waveform data calculation unit that performs waveform data processing based on the specified range of the range specification unit, a processing unit that performs data search based on the data generated by the waveform data calculation unit, and the designated band data of the range specification unit; A gist of the present invention is a spectrum analyzer having a storage unit for storing designated range data and search data processed by the processing means.

A third aspect of the present invention, which has been made to achieve the above object, is to specify a mask by specifying a plurality of frequency bands in a table displayed on a display by setting input means. The gist is the spectrum analyzer described in No. 2.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in the following examples.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Regarding the spectrum analyzer of the present invention,
The configuration and operation will be described with reference to FIGS.
As shown in FIG. 1, the spectrum analyzer of the present invention includes a frequency conversion unit 10, an IF filter unit 20, an IF
It comprises an amplifying unit 30, a detecting unit 40, a data processing unit 50, a display unit 60, a control unit 70, a setting input unit 80, and a sweep signal generating circuit 90. The control unit 70
Is a storage unit 71, a processing unit 72, and a range specifying unit 73
It is composed of That is, the configuration is the same as the conventional one except that the configuration of the control unit 70 is different from the conventional one. Therefore, description of the same operation of the constituent blocks described in the related art will be omitted.

First, a center frequency and a frequency span are input by the setting input means 80 to set a frequency range to be displayed on a screen. Then, as shown in FIG. 2, for example, a table 62 is displayed on the display 61, and the mask frequency range is input by the setting input means 80. Further, the mask frequency band is specified by the range specifying means 73, and the waveform data calculation unit 52 generates data in which only the data excluding the range specified by the mask is valid. Further, the data generated by the waveform data calculation unit 52 is
Data search such as peak search. The result of the data search is stored in the storage unit 71 and displayed on the display unit 60. On the other hand, the data of the range specifying parameter specified by the range specifying unit 73 is processed by the processing unit 72 and stored in the storage unit 71. When the setting of the center frequency or the frequency span is changed, the changed data and the data of the range designation parameter stored in the storage unit 71 are processed by the processing unit 72, and the waveform data calculation unit 5
2 is reflected in the data generated.

For example, as shown in FIG. 3A, when a peak search for spurious components other than harmonics is performed in the frequency range of f1 to f6, the frequency bands f2 to f3 where harmonics exist and the frequency It is necessary to mask the bands f4 to f5. The masking method is as shown in FIG.
A table 62 is displayed on the display 61, and a mask range is input by the setting input unit 80. Then, as shown in FIG. 3B, a peak search is performed in the range of valid data, and the result is displayed on the display 61.

On the other hand, as shown in FIG. 3B, after the data search of the peak search is performed in the valid data range, the frequency range of the screen display is changed from f1 to f6 to f7 to f6.
When the range is changed to the range, the display changes as shown in FIG.

By the way, in FIG. 3B, the spectrum of the masked frequency band is excluded from the display data. However, the spectrum is left as the display data as it is, but is excluded only as a search target of the peak search. Is also good. For example, a frequency band to be masked is shaded so as to be distinguished from other frequency bands as shown in FIG. 5A, or a spectrum of the frequency band to be masked is changed as shown in FIG. The display color or the like may be changed so that it can be distinguished from other frequency bands.

[0017]

The present invention is embodied in the form described above and has the following effects. That is,
In the measurement frequency range, peak search or the like can be performed in a limited range by specifying a plurality of frequency bands at the same time by masking, so that high-speed measurement is possible and the throughput is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of a spectrum analyzer of the present invention.

FIG. 2 is a mask frequency setting table diagram of the spectrum analyzer of the present invention.

FIG. 3 is a diagram of setting a mask for a measurement frequency.

FIG. 4 is a change diagram of a mask setting of a measurement frequency.

FIG. 5 is a change diagram of a mask setting of a measurement frequency.

FIG. 6 is a block diagram of a conventional spectrum analyzer.

FIG. 7 is a window setting diagram of a conventional spectrum analyzer.

[Explanation of symbols]

 Reference Signs List 10 frequency conversion unit 11 mixer 12 local oscillation unit 20 IF filter unit 30 IF amplification unit 40 detection unit 50 data processing unit 51 trace memory 52 waveform data calculation unit 60 display unit 70 control unit 71 storage unit 72 processing means 73 range designation means 80 Setting input means 90 Sweep signal generation circuit

Claims (3)

[Claims] 1. A spectrum analyzer capable of performing data search only in a limited frequency range by designating a frequency band as a mask. 2. A spectrum analyzer for performing frequency sweep by digital control, a range designating means for masking a frequency band to be excluded from data search, and a waveform data calculation for performing waveform data processing based on the designated range of the range designating means. A processing unit for performing a data search based on the data generated by the waveform data calculation unit and the specified band data of the range specifying unit; and storing the specified range data and the search data processed by the processing unit. A spectrum analyzer, comprising: 3. The spectrum analyzer according to claim 1, wherein the mask can be specified by specifying a plurality of frequency bands on a table displayed on a display by setting input means.