JP3378311B2 - RR interval spectrum analysis method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an RR interval spectrum analysis method, and in particular, a spectrum analysis is performed by removing and interpolating noise contained in a target area for spectral analysis of fluctuations in the RR interval input from a long-term electrocardiogram analyzer. And an apparatus therefor.

[0002]

2. Description of the Related Art Generally, it is well known that an interval between R waves forming an electrocardiogram is called an RR interval. In recent years, from the relationship between cardiac dysfunction and autonomic neuropathy,
The method of spectrally analyzing the RR interval, that is, the method of frequency-analyzing the power spectrum of the RR interval fluctuation by using the fast Fourier transform has attracted attention as one method for discovering whether or not there is a disorder in the autonomic nerve. It is coming. In this case, the fluctuation of the RR interval is represented in the RR tachogram which is a trend graph of the RR interval of the electrocardiogram, as is well known. Then, in this RR tachogram, a region for which spectrum analysis is to be performed is selected, and spectrum analysis is performed within the selected analysis target region. However, some of the beats forming the RR interval data in the selected analysis target region are accompanied by ventricular premature contraction, which may prevent accurate spectrum analysis. Heretofore, consideration has been given to performing accurate spectrum analysis by deleting those with ventricular premature contraction from the beats to be analyzed.

[0003]

However, even a beat to be analyzed that does not accompany ventricular premature contraction may correspond to a so-called noise beat. For example, as an example of the noise beat, there is an analysis target beat in which the RR interval is abnormally long because the R wave is not detected. Such a noise beat becomes noise in spectrum analysis, and a spectrum wall is generated, so that accurate spectrum analysis cannot be performed. It is an object of the present invention to eliminate noise beats from a selected area of interest, thereby providing accurate R
To perform R-interval spectrum analysis.

[0004]

The above-mentioned problem is solved by the specified length Ls which becomes a reference when a noise beat is deleted from the beats forming the RR interval data in the selected analysis target area.
et is set, and when a certain beat Ri is equal to or more than the specified length Lset, the beat Ri is regarded as a noise beat and deleted from the analysis target region. 1) and a specified ratio Tset that is a reference when deleting a noise beat among the beats that form the RR interval data in the selected analysis target region, and set the beat R0 immediately before the certain beat R1. Both the ratio Rrb and the ratio Rra of a certain beat R1 to the weighted average Rav are the specified ratio T
A second invention (FIG. 2) which is an RR interval spectrum analysis method characterized in that the beat R1 is regarded as a noise beat and is deleted from the analysis target region when it is equal to or less than set.
And an operation unit 1E that sets a specified length Lset or a specified ratio Tset that serves as a reference when deleting a noise beat among the beats that form the RR interval data in the selected analysis target area, and is set by the operation unit 1E. A third aspect of the invention, which is an RR-interval spectrum analysis device, comprising: a control unit 1B that regards a certain beat as a noise beat and deletes it from the analysis target region with the designated length Lset or the designated ratio Tset as a reference. ) Is solved.

[0005]

As described above, according to the present invention, the noise beat can be deleted from the analysis target area by the first invention (FIG. 1), the second invention (FIG. 2) and the third invention (FIG. 3). became. According to this configuration, conventionally, only the beat associated with the ventricular extrasystole is deleted from the analysis target region, but the present invention can also delete the noise beat from the analysis target region. Therefore, it becomes possible to perform more accurate RR interval spectrum analysis as compared with the conventional case.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings by way of embodiments. As described above, the present invention comprises the first invention (FIG. 1), the second invention (FIG. 2), and the third invention (FIG. 3). A. Regarding First Invention (FIG. 1) In the first invention, when the analysis target beat Ri is equal to or longer than a preset designated length Lset, the beat Ri is regarded as a noise beat and is deleted from the analysis target area. It is a feature. Hereinafter, an embodiment of the method according to the first invention will be described in detail according to each procedure thereof.

(1) Input RR interval data (first step Q1 in FIG. 1). First, when the RR interval spectrum analyzer 1 (FIG. 3), which is an apparatus for carrying out the first invention, is turned on, for example, a personal computer, a menu screen (not shown) is displayed.
When "data reception" is selected on this menu screen, the RR interval data is input from the long-term electrocardiogram analyzer 2 (FIG. 3) connected to the RR interval spectrum analyzer 1. When the "data reception" is completed, the menu screen is displayed again.

(2) A target region to be subjected to spectrum analysis is selected from the input RR interval data (see FIG. 1).
Second step Q2). Next, "Spectrum analysis" on the menu screen (not shown)
Is selected, the analysis target area selection screen G3 of FIG.
The area is switched to 1 and the spectrum analysis target area is selected. In this case, in the analysis target area selection screen G31 shown in FIG. 4 (A), the upper part shows R indicating the fluctuation of the RR interval.
-R tachogram is displayed. When the designation key K3 of the analysis target area selection screen G31 is pressed, the screen is displayed as shown in FIG.
Since it is switched to G32 in (B), the start time of the analysis target area is designated by key input. The enlarged RR tachogram of the analysis target area thus selected is displayed in the lower part of the analysis target area selection screens G31 and G32. When the return key (not shown) is pressed, the screen 31 shown in FIG. 4A is displayed again.

(3) Setting of designated length Lset (3rd in FIG. 1)
Step Q3). In the third step Q3, a designated length Lset serving as a reference when deleting a noise beat among the beats forming the RR interval data in the selected analysis target area is set. That is, the analysis target area selection screen G31 (see FIG.
In (A)), when the setting key K1 is pressed, the screen switches to the analysis and display condition setting screen (not shown), and when the auxiliary setting key (not shown) on that screen is pressed, noise is displayed as shown in FIG. The screen switches to the processing setting screen G4.

In the noise processing setting screen G4, reference numeral G41 is a noise processing method and G42 is a noise level. The noise processing method G41 represents the type of the noise processing method, the “length” is the processing method according to the first aspect of the present invention (FIG. 1), and the designated length Lset is designated, whereby the analysis target area is set. Is a method of deleting noise beats included in, that is, deletion of a designated length, and “ratio” is a processing method (FIG. 2) according to a second invention described later, in which a designated ratio T
This is a method of deleting a noise beat included in the analysis target area by specifying set, that is, a specified ratio deletion, and “OFF” is a case where there is no noise deletion processing.

Further, the noise level G42 represents an integer value set when the designated length is deleted (when "length" is selected) or the designated ratio is deleted (when "ratio" is selected). , 1 to 99 (seconds) for specified length deletion, 1 to 99 (%) for specified ratio deletion,
If there is no noise removal processing (when "OFF" is selected), no number is displayed.

The items of the noise processing method G41 and the noise level G42 are both selected by the cursor key. In the embodiment of FIG. 5, the designated length deletion is performed as the noise processing method G41, and the noise level G42 is also selected. As 3
Seconds is selected. Further, when changing the integer value of the noise level G42, it is possible to increase or decrease from 1 to 99 by simultaneously pressing the SHIFT key and the ↑ ↓ key.

Thus, the designated length Lset is set (see FIG. 1).
After performing the third step Q3) of FIG. 5, when the analysis key K4 is pressed on the noise processing setting screen G4 of FIG. 5, the operations from the fourth step Q4 to the seventh step Q7 described later are performed, and shown in FIG. The screen G6 is displayed. This screen G6
In addition to the data processing conditions and the current processing status, the noise processing condition display portion G61 is displayed.
In the present embodiment, as shown in FIG. 5, the noise processing method G4
Since the designated length deletion is selected as 1 and 3 seconds is selected as the noise level G42, "noise deletion length 3 seconds" is displayed in the noise processing condition display portion G61 in FIG.

Data processing conditions, which are other display items, display the processing conditions of data set in advance as a premise for performing spectrum analysis. Among the items, in particular, "number of analysis samples" is shown in FIG. Means that the length of the RR interval data of the analysis target region selected in the second step Q2 is “512 beats”, and the “arrhythmia processing method” is a kind of arrhythmia as described in the related art. The presence of the beat to be analyzed with the ventricular premature systole does not allow accurate spectral analysis, and "V deletion" is selected because of the need to remove it.
In addition, the current processing status indicates the processing status of the spectrum analysis for 512 beats from the start time 23:00:00, which is the selected analysis target area, and is currently "processing", It means that analysis is being done.

The operation from the fourth step Q4 to the seventh step Q7 will be described below. (4) It is determined whether or not the analysis target beat is equal to or longer than the designated length Lset (fourth step Q4 in FIG. 1). In the fourth step Q4, the beat Ri having the analysis target area, that is, the analysis target beat Ri is the specified length Lse.
It is determined whether or not t or more. And that beat R
If i is greater than or equal to the designated length Lset, the process proceeds to the next fifth step Q5. If i is less than the designated length Lset, the process proceeds to the next sixth step Q6.

(5) Deletion from the analysis target area (fifth step Q5 in FIG. 1). In the fifth step Q5, when the analysis target beat Ri is the specified length Lset or more, the beat Ri is regarded as a noise beat and is deleted from the analysis target region. For example, as shown in FIG. 5, in the present embodiment, the designated length Lse
Since t is set to 3 seconds, the beat R of the analysis target area
When the length of i is 3 seconds or more, this beat Ri is deleted from the analysis target area. If necessary, the deleted part can be interpolated.

(6) It is judged whether or not all the beats have been checked (the sixth step Q in FIG. 1).
6). In the sixth step Q6, all beats in the analysis target area are checked (the analysis target beat has the specified length L
Judgment whether or not it is set or more (4th step Q in FIG. 1)
4)) is completed, and if the check is completed (YES), the process proceeds to the next seventh step Q7, and if the check is not completed (NO), the check is performed again (the first). 4 steps Q4).

(7) RR interval spectrum analysis is performed (7th step Q7 in FIG. 1). After the above check, in the seventh step Q7, the RR interval spectrum analysis is performed on the analysis target region that has been subjected to the noise processing.

(8) The analysis result is output (8th step Q8 in FIG. 1). When the spectrum analysis is completed, the analysis result is displayed, for example, as a screen G5 in FIG. On the screen G5, an enlarged RR tachogram G51, an RR histogram G52, and a power spectrum G53 as a result of spectrum analysis are displayed, and
The noise processing condition G54 is displayed. The noise processing condition G54 displays under what condition the noise beat of the analysis target region is deleted. In the present embodiment, the beat Ri of the analysis target region has a specified length of 3 seconds or more. In that case, since the beat Ri is deleted from the analysis target area, the condition in that case is “Noise de
l.:>3 sec ”is displayed.

As described above, as a result of performing the spectrum analysis by removing the noise beats from the analysis target area, the RR interval spectrum analysis is performed more accurately than before, and the power spectrum G53 has two peaks G531 and G532. Is appearing. This reflects the sympathetic nerve activity and parasympathetic nerve activity that compose the autonomic nerve activity, and peak G
531 is a component showing sympathetic nerve activity and parasympathetic nerve activity, and peak G532 is a component showing parasympathetic nerve activity.

B. Regarding the Second Invention In the second invention (FIG. 2), the ratio Rrb of the beat R1 to be analyzed to the beat R0 immediately before and the beat R to be analyzed.
When both of the ratios Rra to the weighted average Rav of 1 are equal to or less than the preset specified ratio Tset, that is, when the change is large, the beat R1 is regarded as a noise beat and deleted from the analysis target region. This is a normal beat to be analyzed, and the spectrum analysis is accurately performed even when the RR interval varies.

That is, the RR interval is constantly changing even in a normal person. In particular, when exercising, sleeping, etc., it becomes longer or shorter than the normal RR interval. Therefore, as in the first invention (FIG. 1),
In any case, the method of deleting when the analysis target beat Ri is equal to or larger than the specified length Lset with reference to the designated length Lset uniformly, there is a risk that even a normal analysis target beat is deleted. Therefore, the second invention (FIG. 2) is
This risk is eliminated and accurate spectrum analysis is performed.

An embodiment of the method according to the second aspect of the invention (FIG. 2) will be described below in detail according to the respective steps. (1) Input RR interval data (first step Q1 in FIG. 2). (2) Select a target region to be subjected to spectrum analysis from the input RR interval data (second step Q2 in FIG. 2). The above (1) and (2) are exactly the same as the first aspect of the invention shown in FIG. The following procedure will be described assuming that the return key (not shown) is pressed to switch to the screen G31 of FIG. 4A again.

(3) Setting the designated ratio Tset (third step Q3 in FIG. 2). In a third step Q3, a designated ratio Tset that serves as a reference when deleting a noise beat among the beats forming the RR interval data in the selected analysis target area is set. The operation in this case is similar to that of the first invention (FIG. 1). When the setting key K1 is pressed on the analysis target area selection screen G31 (FIG. 4A), the analysis and display condition setting screen (not shown) is displayed. If the auxiliary setting key (not shown) on the screen is further pressed, the screen is switched to the noise processing setting screen G4 as shown in FIG.

In the noise processing setting screen G4, as for the noise processing setting method G41, the processing method according to the second invention (FIG. 2) is the deletion of the designated ratio.
Is selected, and for the noise level G42, for example,
70 (%) is set. Further, similarly to the first invention (FIG. 1), when changing the integer value of the noise level G42, it is possible to increase or decrease from 1 to 99 by simultaneously pressing the SHIFT key and the ↑ ↓ key.

After setting the designated ratio Tset (third step Q3 in FIG. 2) in this way, the analysis key is displayed on the noise processing setting screen G4 in FIG. 5 as in the first invention (FIG. 1). When K4 is pressed, the fourth step Q4 which will be described later
To the seventh step Q7 are performed, and the screen G6 shown in FIG. 6 is displayed. The second invention is the designated ratio Tset.
This is a deletion method. Since "ratio" is selected as the noise processing method G41 and "70"% is selected as the noise level G42 on the noise processing setting screen G4 in FIG. 5, the noise processing condition display in FIG. In the section G61, "Noise elimination ratio 70%" is displayed.

The other display items are the same as those in the first aspect of the invention (FIG. 1), and the description thereof will be omitted.

The operation from the fourth step Q4 to the seventh step Q7 will be described below. (4) Both Rrb and Rra are the specified ratio Tset
It is determined whether or not (the fourth step Q in FIG. 2)
4). In a fourth step Q4, it is determined whether both the ratio Rrb of the analyzed beat R1 to the immediately preceding beat R0 and the ratio Rra of the analyzed beat R1 to the weighted average Rav are equal to or less than the specified ratio Tset. In this case, the weighted average R of the ratio Rrb to the beat R0 immediately before the beat R1 to be analyzed and the beat R1 to be analyzed
The ratio Rra to av is determined as follows.

The beat R immediately before the beat R1 to be analyzed
Ratio to 0 Rrb −i R1 ≦ R0 Rrb = (R1 / R0) × 100 (%) −ii R1> R0 Rrb = (R0 / R1) × 100 (%) And the Rrb thus determined Is the specified ratio Ts
If it is equal to or less than et, that is, if Rrb ≦ Tset ... (A), the analysis target beat R1 is set as a deletion candidate.

Ratio of the analyzed beat R1 to the weighted average Rav Rra-i R1≤Rav Rra = (R1 / Rav) × 100 (%)-ii R1> Rav Rra = (Rav / R1) × 100 ( %) The Rra thus determined is the specified ratio Ts.
If it is equal to or less than et, that is, if Rra ≦ Tset (B), the analysis target beat R1 is set as a deletion candidate.

Under the above conditions (A) and (B), the following processing is performed. (A) When both (A) and (B) are satisfied, that is, Rr
If both b and Rra are less than or equal to the specified ratio Tset, the process proceeds to the next fifth step Q5, and the beat R1 is deleted from the analysis target region. (B) If either or both of (A) and (B) are not satisfied, it is considered that the beat is not a noise beat, and the process proceeds to the sixth step Q6.

The weighted average Rav is defined as follows. That is, the weighted average Rav when the weighted average Rav is the initial value Rav ′ of the weighted average Rav and the weight of the analysis target beat R1 is 4: 1 and the weighted average Rav is Rav = {(Rav ′ × 4) + R1 × 1} / (4 + 1)
= ((Rav ′ × 4) + R1} / 5 (C) Then, the weighted average Ra represented by the equation (C)
v is sequentially updated for each valid data that has been subjected to noise processing.

(5) Deletion from the analysis target area (fifth step Q5 in FIG. 2). In the fifth step Q5, when Rrb and Rra are equal to or less than the specified ratio Tset (YES in FIG. 2),
The beat R1 is regarded as a noise beat and deleted from the analysis target area. For example, as described above, in the present embodiment, the specified ratio Tset is set to 70%, so Rrb
And Rra is 70% or less, the beat R
1 is deleted from the analysis target area. If necessary, the deleted part can be interpolated.

(6) It is judged whether or not all the beats have been checked (the sixth step Q in FIG. 2).
6). In the sixth step Q6, whether or not the check (determination as to whether both Rrb and Rra are equal to or less than the specified ratio Tset (fourth step Q4 in FIG. 2)) has been completed for all beats in the analysis target area If the check is completed (YES), the process proceeds to the next seventh step Q7. If the check is not completed (NO), the check is performed again (fourth step Q4).

(7) RR interval spectrum analysis is performed (7th step Q7 in FIG. 2). After the above check, in the seventh step Q7, the RR interval spectrum analysis is performed on the analysis target region that has been subjected to the noise processing.

(8) Output the analysis result (eighth step Q8 in FIG. 2). When the spectrum analysis is completed, the analysis result is displayed, for example, as in the screen G5 of FIG. 7. However, in the second invention, the noise processing condition G54 is, for example, “Noise del.:<70. % "Is displayed.

The other display items are the same as those in the first aspect of the invention (FIG. 1), and the description thereof will be omitted.

C. Third Invention FIG. 3 is a diagram showing an embodiment of the third invention. In the figure, reference numeral 1 is an RR interval spectrum analyzer, and 2 is a long-term electrocardiogram analyzer. The RR interval spectrum analyzer 1 is a device, for example, a personal computer, which inputs the RR interval data, performs spectrum analysis, and outputs the result, and the long-term electrocardiogram analyzer 2 inputs a long-term electrocardiogram and outputs it. Is an apparatus for analyzing the RR and outputting the RR interval data and the like as the analysis result. The RR interval spectrum analyzer 1 includes an input unit 1A, an operation unit 1E, a control unit 1B, and
It is composed of a spectrum analysis unit 1C and an output unit 1D.

The input section 1A is a device for inputting RR interval data. In the case where the operation unit 1E selects a target region in which the spectrum analysis is to be performed from the RR interval data and deletes a noise beat among the beats forming the RR interval data in the selected analysis target region. This is a device for setting a designated length Lset as a reference.

The control unit 1B regards a certain beat as a noise beat and deletes it from the analysis target region based on the designated length Lset or the designated ratio Tset set by the operation unit 1E, and deletes the entire RR interval spectrum analyzer 1. It is a device for controlling. The spectrum analysis unit 1C is a device that performs spectrum analysis on the analysis target region that has undergone noise processing by the control unit 1B. The output unit 1D is
This is an apparatus for outputting the result analyzed by the spectrum analysis unit 1C.

The operation of the third invention having the above construction will be described below. First, the RR interval data signal S1 from the long-term electrocardiogram analyzer 2 is input to the input unit 1A. This RR
The interval data signal S1 includes RR interval data for a long time. Therefore, if a predetermined time is specified by the specification signal S5 from the operation unit 1E, the RR interval data signal S2 within the predetermined time is specified.
Input from the input unit 1A to the control unit 1B. Control unit 1
In B, the RR interval data signal S within this predetermined time
Based on No. 2, a data file is created in the internal storage device or the external storage device (not shown) and used for the subsequent spectrum analysis.

The signal S5 from the operation unit 1E causes RR
The analysis target area is selected on the tachogram, and the designated length Lset or the designated ratio Tset that serves as a reference when the noise beat of the analysis target beat is deleted is set. The control unit 1B transmits the analysis target region after noise processing to the spectrum analysis unit 1C as the RR interval data signal S3 with the designated length Lset or the designated ratio Tset set by the operation unit 1E as a reference.

In the spectrum analysis section 1C, this R
A spectrum analysis is performed on the basis of the R interval data signal S3, and the spectrum analysis unit 1C analyzes the analysis result signal S4 including the power spectrum G53 (FIG. 7) as the analysis result.
Is output. Control unit 1 that received the analysis result signal S4
B transmits the signal S6 after the predetermined processing to the output unit 1D. In the output section 1D, the expanded RR tachogram G51, the RR histogram G52, the power spectrum G53, and the noise processing condition G54 (FIG. 7) are displayed on the screen by the display section 1D1 based on the input signal S6. , Or its printer 1D2.

In the case of printing, a noise processing method is additionally written, and for example, it is printed such as "Delete for 3 seconds or more in length". Further, in the above-described embodiment, the description of FIGS. 5 to 7 is about the noise processing in the so-called manual mode, but other automatic modes or the noise processing in the time domain parameter measurement mode are also possible.

[0045]

As described above, according to the present invention, the first invention (FIG. 1), the second invention (FIG. 2) and the third invention (FIG. 3) are provided.
Has taken the technical measure that noise beats can be removed from the area to be analyzed. With this configuration, conventionally, only the beat associated with the ventricular premature contraction has been deleted from the analysis target region, but the present invention can also delete the noise beat from the analysis target region. Therefore, by removing the noise beats from the selected analysis target area, it is possible to achieve the technical effect of performing accurate RR interval spectrum analysis.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a first invention.

FIG. 2 is a diagram showing an embodiment of a second invention.

FIG. 3 is a diagram showing an embodiment of a third invention.

FIG. 4 is an explanatory diagram of the operation of the present invention.

FIG. 5 is an operation explanatory diagram of the present invention.

FIG. 6 is an operation explanatory diagram of the present invention.

FIG. 7 is an operation explanatory diagram of the present invention.

[Explanation of symbols]

1A input section 1E Operation part 1B control unit 1C spectrum analyzer 1D output section

Continuation of front page (56) Reference JP-A-64-27535 (JP, A) JP-A-62-22626 (JP, A) JP-A-53-83377 (JP, A) JP-A-4-352941 (JP , A) JP-A-6-105818 (JP, A) JP-A-7-132118 (JP, A) JP-A-52-105687 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB) (Name) A61B 5/04-5/0472

Claims (10)

(57) [Claims] 1. A specified length Lset is set as a reference for setting a specified length Lset as a reference when deleting a noise beat among beats forming RR interval data in a selected analysis target region.
When i is equal to or more than the specified length Lset, the beat Ri is regarded as a noise beat and deleted from the analysis target region. 2. The RR interval spectrum analysis method according to claim 1, wherein the deleted portion is interpolated. 3. A specified ratio Tset, which is a reference when deleting a noise beat among the beats forming the RR interval data in the selected analysis target area, is set, and a beat R0 immediately before a certain beat R1 is set. When both the ratio Rrb and the ratio Rra of a certain beat R1 to the weighted average Rav are equal to or less than the specified ratio Tset, the beat R1 is regarded as a noise beat and deleted from the analysis target region. Analysis method. 4. The RR interval spectrum analysis method according to claim 3, wherein the deleted portion is interpolated. 5. A beat R which is one beat before the certain beat R1.
When the ratio Rrb to 0 is R1 ≦ R0, Rrb
4. The RR interval spectrum analysis method according to claim 3, wherein: (R1 / R0) × 100 (%), and when R1> R0, Rrb = (R0 / R1) × 100 (%). 6. When the ratio Rra of the certain beat R1 to the weighted average Rav is R1 ≦ Rav, Rra =
(R1 / Rav) × 100 (%), and R1> Rav
In the case of, Rra = (Rav / R1) × 100 (%), The RR interval spectrum analysis method according to claim 3. 7. The weighted average Rav is the initial value Rav ′ of the weighted average Rav, which is the average value of 10 beats before the analysis start beat, and the beat R1 to be analyzed, and the weight is 4:
When set to 1, Rav = {(Rav ′ × 4) + R1}
The RR interval spectrum analysis method according to claim 3, which is represented by / 5. 8. An operation unit 1E for setting a specified length Lset or a specified ratio Tset that serves as a reference when deleting a noise beat among the beats forming the RR interval data in the selected analysis target area, and the operation unit. An RR interval spectrum analyzing apparatus, comprising: a control unit 1B which regards a certain beat as a noise beat and deletes it from the analysis target region with reference to the designated length Lset or the designated ratio Tset set in 1E. 9. The RR-interval spectrum analyzer according to claim 8, further comprising an output unit 1D for outputting a result of RR-interval spectrum analysis performed on the analysis target region from which the noise beat has been deleted. 10. The RR according to claim 8, wherein the output unit 1D includes a display unit 1D1 or a printer 1D2.
Interval spectrum analyzer.