JP2975900B2 - Burst signal frequency measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burst signal frequency measuring device for measuring the frequency of an input burst signal.

[0002]

2. Description of the Related Art In digital communication systems such as an automobile telephone system, a portable telephone system and a simple portable telephone system, a burst signal is often adopted as a signal transmitted and received between a base station and each mobile station.

FIG. 8 is a signal waveform diagram of a general burst signal. Burst frame 1 formed in the burst continue within the period T _F of burst signal a having a burst period T _B
As shown in the figure, a ramp bit is set at the head position, frame information indicating the source and destination of the burst frame 1 is set, and a plurality of data areas to be transmitted are set thereafter. I have. Then, a guard bit is set at the last position.

[0004] After digital information constituting such a burst frame 1 is modulated by various modulation methods, it is finally mounted on a high-frequency carrier signal to form a burst signal a. In the burst signal frequency measuring device for measuring the frequency f of the carrier signal in the burst duration T _F of burst period T _B shown in FIG. 8, as shown in FIG. 9, the burst signal burst duration within T _F of a , A measurement section _TG is set, and the frequency f of the carrier signal is measured in the measurement section _TG .

As a method of setting the measurement section _TG , a rising edge of the burst signal a is detected by an edge position detector,
Elapsed a predetermined time T _1, which is uniquely determined in accordance with the burst period T _B and a burst duration T _F of burst signal a from the output time for example of the measurement object of the edge detection signal output from the edge position detector After that, the measurement section starts and ends after the time _TG . That is, between the start time T ₁ of the measurement interval T _G, is measured.

Furthermore, in other words, as the card bit head of Ranbubitto and terminating in a burst frame 1 is not included in the measurement interval T _G, the start time T ₁ and the measurement interval T _G is set.

However, digital information constituting the burst frame 1 incorporated in the burst duration T _F of the burst signal a modulates the carrier signal by various modulation methods. Therefore, for example, in the case of FM modulation, if the measurement section _TG is excessively narrowed, there is a concern that the measured frequency value fluctuates. Further, as shown in FIG. 8, the frequency f may be different for each data area.

In order to eliminate such inconveniences, a frequency measuring apparatus has been proposed which can arbitrarily set the position and time width of the measuring section _TG within the burst duration _TF . In such a frequency measuring device, it is possible to measure the frequency f of the carrier signal at an arbitrary time width W at an arbitrary position in the burst duration T _F.

[0009]

However, even in a frequency measuring apparatus in which the position and the time width of the measuring section _TG within the burst duration _TF can be arbitrarily set,
There were the following issues that still need to be improved.

[0010] That is, this on the operator of the frequency measuring device is accurately understand the burst period T _B and a burst duration T _F of burst signal a to be measured, starting identifies the measurement interval T _G time T ₁ ( It is necessary to set the position) and the time width (the width of _TG ).

[0011] However, in general, the operator, the burst cycle of the burst signal a measurement target T _B and the burst duration T
_It is rare that _F is accurately grasped in advance. In many cases, the above-described burst period T _B and burst duration T _F are measured simultaneously, including the measurement of the frequency f of the carrier signal.

Therefore, there is no way for the operator to confirm whether the start time T ₁ and the time width set by the operator are appropriate before the measurement. Therefore, as a result of setting incorrectly, a part of the measurement section _TG becomes the burst duration T.
Or out of the _F, and it takes it refers to the guard bit area, a large error in the measured frequency f there is a concern that occur.

Further, even when it becomes necessary to measure the frequency f of the carrier signal in a specific data area in the burst frame 1, the measurement section _TG accurately corresponds to the target data area. There was no way to easily check that it was.

The present invention has been made in view of such circumstances, and displays a burst pattern waveform of an input burst signal and a measurement section simultaneously on a display device, thereby enabling the burst duration and frequency of the burst signal to be displayed. While easily confirming the positional relationship with the measurement section visually, the measurement section setting and actual frequency measurement can be performed, the workability of frequency measurement is improved, and even if the operator is unfamiliar, It is an object of the present invention to provide a burst signal frequency measuring device capable of reliably measuring the frequency of a target position in a burst signal without error.

[0015]

In order to solve the above-mentioned problems, a burst signal frequency measuring apparatus according to the present invention comprises:
In response to a burst signal in which a continuation section in which the carrier signal continues and a section in which the carrier signal is interrupted are repeated, an edge position detection unit that detects a switching position in any one of the sections is provided. A burst pattern waveform creating section for creating a burst pattern waveform, and according to an operation input,
A measurement section setting section for setting a measurement section for measuring the frequency of the carrier signal within the duration of the burst signal, a gate signal creation section for creating a gate signal indicating the measurement section set by the measurement section setting section, and a burst pattern A display device that displays the burst pattern waveform created by the waveform creating unit, and displays so that it is possible to visually recognize which part of the burst pattern waveform the set measurement section is;
A frequency measuring unit that measures the frequency of the carrier signal in a measurement section specified by the gate signal of the burst signal and outputs the measured value to a display device for display.

In the burst signal frequency measuring apparatus thus configured, the switching position (edge position) of each section of the input burst signal is detected, and the burst of the burst signal input from each edge position is detected. A pattern waveform is created. Further, when the operator sets a measurement section of the frequency of the carrier signal within the duration of the burst signal in the measurement section setting section, a gate signal corresponding to the set measurement section is generated. Then, the burst pattern waveform and the pattern of the measurement section specified by the gate signal are simultaneously displayed on the same display screen of the display device.
The same display screen also displays the measured frequency in the measurement section at the same time.

Therefore, the operator can perform the frequency measurement operation while easily visually confirming the positional relationship between the burst duration of the burst signal and the frequency measurement section. Further, the burst signal frequency measuring apparatus of another invention receives a burst signal in which a continuation section in which the carrier signal continues and a section in which the carrier signal is cut off, and switches the switching position of any section from a predetermined time. An edge position detector for detecting time, a burst pattern waveform generator for generating a burst pattern waveform from a switching position of the detected section, and a carrier signal within a burst duration of the burst signal in response to an operation input. A measurement section setting section for setting a measurement section whose frequency is to be measured; a pattern overlap processing section for overlapping the measurement section setting section and the pattern of the set measurement section on the burst pattern waveform created by the burst pattern waveform creation section; A display device that displays a burst pattern waveform on which a pattern of a measurement section is superimposed by a superimposition processing unit from a predetermined time , In which a frequency measurement unit allowed to display on the display device by measuring the frequency of the carrier signal in the measurement period of the burst signal.

In the burst signal frequency measuring apparatus having such a configuration, the delay time from the edge position of the burst signal to the start position of the measurement section specified by the operator is calculated and set by the elapsed time from a predetermined time. . Therefore,
The setting accuracy of the start position of the measurement section is improved.

Further, since the pattern of the measurement section specified by the gate signal is displayed in a state of being superimposed on the burst pattern waveform, the relationship between the burst pattern waveform and the measurement section is displayed more clearly.

According to another aspect of the present invention, the burst signal frequency measuring apparatus of each of the above-described inventions is provided with a burst pattern according to the time width of each section of the burst pattern waveform created by the burst pattern waveform creating section. A display range automatic switching unit for automatically switching the display range of the waveform display device in the time direction is added. Therefore,
The operator can perform the frequency measurement operation without particularly worrying about the burst duration of the burst signal to be measured.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an external view of a burst signal frequency measuring device according to an embodiment of the present invention. An operation in which a display unit 3 having a two-dimensional display screen 3a constituted by, for example, an LCD (liquid crystal display panel), numeric keys 4a ranging from 0 to 9, and various function keys 4b are arranged on a front surface 2a of the housing 2. The panel 4 and the power switch 5 are mounted.

When the burst signal frequency measuring device is in the normal measurement mode, the display screen 3a of the display unit 3 is displayed as shown in FIG.
As shown in FIG. 2, a burst pattern waveform 7 of the input burst signal a, a pattern of a measurement section (T _G ) 8 superimposed on the burst pattern waveform 7 with a thick solid line, and within this measurement section (T _G ) 8 The measured digital frequency 6 of the carrier signal of the burst signal a is displayed.

Further, the display screen 3a of the display unit 3 has a delay indicating the elapsed time from the input time of the trigger signal d input from the outside shown in FIG. 3 to the disclosure time of the measurement section ( _TG ) 8. Time (Trig Delay) 9 and measurement section (T _G )
Each title of a time width (Gate Width) 10 of 8 and a set delay time (D) 1 indicating the measurement start actually set by the operator
1 and a set time width (W) 12 indicating the end of the measurement are displayed.

The actual set delay time (D) 11 and set set time width (W) 1 in the measurement section (T _G ) 8
2 is set by the operator using the operation panel 4 in the setting mode of the burst signal frequency measuring device.

FIG. 3 is a block diagram showing a schematic configuration of the burst signal frequency measuring device. A burst signal a of a carrier signal (high frequency) having a burst period T _B and a burst duration T _F shown in FIGS. 4 and 8, for example, which is input from the signal input terminal 13 is input to the waveform detector 14 and the frequency measurement unit 20. You. The waveform detector 14 performs envelope detection on the input burst signal a and sends out an envelope detection signal b shown in FIG. 4 to the next edge detector 15. The edge detection unit 15
It has a reference voltage, compares it with the envelope detection signal b, detects the rise and fall of the envelope detection signal b, and at the detected time, detects the essence detection signals c ₁ and c ₂ respectively shown in FIG. Is sent to the next edge position counter 16.

The trigger signal d shown in FIG. 4 input from the trigger signal input terminal 17 is an edge position counter 16, a burst pattern waveform generator 18, and a gate position counter 2.
1 is input. The output cycle of the trigger signal d is the burst period T _B of the input burst signal a
And the output (generation) timing is set before the start of the burst duration T _F of the burst signal a.

The edge position counter 16 counts elapsed times A and B from the time of generation of the trigger signal d to the time of input of each of the edge detection signals c ₁ and c ₂ , and outputs the next burst pattern as edge position information. The waveform is sent to the waveform generator 18. The burst pattern waveform generator 18 generates the burst pattern waveform signal h shown in FIG. 4 which rises at the timing when the time A has elapsed from the generation time of the trigger signal d and falls at the timing when the time B has elapsed from the generation time of the trigger signal d.
Is generated and transmitted to the next pattern superimposition processing unit 19.

The measurement section setting section 22 has already been set by the operator using the operation panel 4 on the front surface 2a of the housing 2 as shown in FIG.
The set delay time D and the set time width W from the generation time of the trigger signal d in the measurement section 8 described in the above section are stored and held. The measurement section setting unit 22 compares the set delay time D and the set time width W stored and held with the gate position counter 2.
1 and the display control unit 27.

As shown in FIG. 4, the gate position counter 21 has a timing at which a set delay time D elapses from the generation time of the trigger signal d and a timing at which the time (D + W) elapses from the generation time of the trigger signal d. The signals e ₁ and e ₂ are sent to the next gate signal generator 25. The gate signal generator 25 outputs the first timing signal e
₄ rising at ₁ and falling at next timing signal e ₂
Is generated and sent to the frequency measurement unit 20 and the pattern superimposition processing unit 19.

The frequency measuring section 20 measures the frequency f of the carrier signal in the measuring section _TG designated by the gate signal g in the burst duration _TF of the inputted burst signal a and sends it to the display control section 27. . Note that the measurement cycle of the frequency f in the frequency measurement unit 20 changes according to the required measurement accuracy (the number of significant digits) of the frequency. However, when the set measurement section _TG is short, one burst frame is used. In some cases, the measurement cannot be completed within the measurement section _{TG of} 1 (burst duration T _F ). In such a case, as shown in FIG. 6, frequency measurement is performed over a measurement section _TG of a plurality of burst frames 1 (burst duration T _F ).

The pattern superposition processing section 19 adds a high-level section corresponding to the measurement section _TG of the gate signal g input from the gate signal generation section 25 to the burst pattern waveform signal h input from the burst pattern waveform generation section 18. A composite waveform signal i shown in FIG. 4 superimposed by a thick solid line is created. The pattern superimposition processing section 19 sends the created composite waveform signal i to the display range automatic switching section 26 and the display control section 27.

The automatic display range switching unit 26 is configured to determine in advance the length of the high-level section of the composite waveform signal i input from the pattern superposition processing unit 19, that is, the length of the burst duration _TF of the burst signal a. The set display range R is sent to the next display control unit 27.

That is, the display range automatic switching section 26
Sets the display range R so that the burst pattern waveform 7 shown in FIG.

For example, when the display range automatic switching unit 26 does not exist, as shown in FIGS. 7A, 7B and 7C, when the burst duration period T _F is long, the display screen 3a jumps out and the burst If the duration _TF is short, it is displayed only on a part of the display screen 3a. However, by automatically switching the display range R in the time direction by the display range automatic switching unit 26, even if the burst duration T _F changes greatly as shown in FIGS. 7 (a), 7 (b) and 7 (c),
As shown in FIGS. 7D, 7E, and 7F, each burst pattern waveform 7 is displayed in the display screen 3a of the display unit 3 with an optimum size.

The display control unit 27 is provided with a
The composite waveform signal i of the burst pattern input from the display unit 3 is displayed and output as a burst pattern waveform 7 and a measurement section 8 on the display screen 3a of the display unit 3 as shown in FIG. Further, the display control unit 27 converts the frequency f input from the frequency measurement unit 20 into a digital frequency 6 on the same display screen 3.
Display output to a. In addition, set delay time (Trig Dela
y) The title of 9 and the set time width (Gate Width) 10 and the actual set delay time (D) 11 and the set time width (W) 12 input from the measurement section setting unit 22 are displayed on the same display screen 3a. Display output.

Next, the process of setting the set delay time D and the set time width W of the measurement section _{TG in} the measurement section setting section 22 will be described. First, in a state where the burst signal a to be measured is being input, the operator operates the function key 4b of the operation panel 4 to set the operation mode of the burst signal frequency measuring device to the setting mode. The unit 23 is activated and displays the input operation guide shown in FIG. 5 on the display screen 3 a of the display unit 3. Also, the burst pattern waveform 7 of the input burst signal a is displayed at the same time.

In the input operation guide shown in FIG.
The title of the set time width (Gate Width) 10 is highlighted,
The input instruction of the set time width W is shown. When the operator key-inputs the actual set time width W with the number key 3a of the operation panel 3, the input set time width W is stored and held, and the set value display output unit 24 is activated to input the set time width W. The set time width W12 is set to the set time width (Ga
te Width) is displayed below 10.

When the setting process of the set time width W is completed, the reverse display of the title of the set time width (Gate Width) 10 is canceled, and the title of the set delay time (Trig Delay) 9 is displayed in reverse. It is in a state of waiting for input of time D. Then, when the operator inputs the set delay time D from the trigger occurrence time using the numeric key 3a, the inputted set delay time D
11 is stored and output to the lower side of the title of the set delay time (Trig Delay) 9 on the display screen 3a.

Further, the measurement section 8 set by the set delay time D and the set time width W is superimposed on the burst pattern waveform 7 and displayed. When the above setting operation is completed, the operator operates the function key 3b to return the operation mode to the measurement mode.

In this embodiment, the set delay time D and the set time width W are set. However, for example, the set delay time D and another set delay time (D + W) can be set. . Further, a set delay time (D + W / 2)
And the set time width (± W / 2).

In the thus configured burst signal frequency measuring apparatus, as shown in FIG. 2, the display screen 3a of the display unit 3 displays the burst corresponding to the burst continuation section _TF of the burst signal a to be measured. The pattern waveform 7 is displayed, and the frequency measurement section 8 of the burst pattern waveform 7 is indicated by a bold solid line.
Will be superimposed.

As described above, it is possible to immediately grasp where the measurement section 8 set by the operator using the operation panel 3 is located on the burst pattern waveform 7 simply by looking at the display screen 3a. Accordingly, it is possible to prevent a situation in which a part of the measurement section 8 is erroneously deviated from the burst duration period T _F or a situation in which a ramp bit or a guard bit is approached, thereby improving the reliability of the measurement result.

When the operator designates each data area in the burst frame 1 shown in FIG. 8 as a measurement section, for example, the operator sets the measurement section 8 and the entire burst pattern waveform 7 (burst duration T _F ). Since the relationship is displayed on the display screen 3a, the measurement section 8 can be set accurately and reliably.

Further, as described with reference to FIGS. 7A to 7F, the display range of the burst pattern waveform 7 in the time direction is automatically switched, so that the burst duration _TF greatly changes. However, each burst pattern waveform 7 is always displayed on the display screen 3a of the display unit 3 with an optimum size. Therefore, it is not necessary for the operator to perform the switching operation of the display range, and the operation burden is reduced.

The elapsed times A and B from the trigger signal d generation time to each edge position of the burst signal a and the set delay time D from the start position of the measurement section (T _G ) 8 specified by the operator are: It is calculated and set by the elapsed time from the trigger generation time of the trigger signal d. Therefore, for example, the gate position counter 21 is determined based on the rising time of the edge detection signal c ₁ indicating the detection timing in the edge detection unit 15.
Is started, the setting accuracy of the start position of the measurement section 8 is improved.

Further, in the setting operation of the set delay time D and the set time width W for specifying the measurement section (T _G ) 8 within the burst duration T _F , the input operation guide and the measurement section 8 on the burst pattern waveform 7 are set. The result of the setting is displayed on the display screen 3a of the display unit 3.

Therefore, the operator can set the set delay time D and the set time width W to optimal values while observing the measurement section 8 displayed on the display screen 3a, and the setting work efficiency of the measurement section 8 is greatly improved. Come.

[0048]

As described above, in the burst signal frequency measuring apparatus of the present invention, the burst pattern waveform of the input burst signal and the measurement section are simultaneously displayed and output on the display device.

Therefore, the operator can set the measurement section and perform the actual frequency measurement while easily visually confirming the positional relationship between the burst duration of the burst signal and the frequency measurement section. The workability of the measurement is improved, and the frequency of the target position in the burst signal can be reliably measured without error even for an unskilled operator.

[Brief description of the drawings]

FIG. 1 is an external view of a burst signal frequency measuring device according to an embodiment of the present invention.

FIG. 2 is an exemplary view showing display contents of a display screen in the embodiment.

FIG. 3 is a block diagram showing a schematic configuration of the embodiment;

FIG. 4 is a time chart showing the operation of the embodiment;

FIG. 5 is a view showing an input operation guide displayed on a display screen when a measurement section is set in the embodiment.

FIG. 6 is an exemplary view for explaining a measurement operation of the frequency measurement unit of the embodiment.

FIG. 7 is an exemplary view for explaining automatic switching of a display range of a burst pattern waveform according to the embodiment.

FIG. 8 is a diagram showing a signal waveform and a frame configuration of a general burst signal.

FIG. 9 is a diagram showing a conventional method of setting a measurement section.

[Explanation of symbols]

 2 ... housing 3 ... display section 4 ... operation panel 6 ... frequency 7 ... burst pattern waveform 8 ... measurement section 14 ... waveform detection section 15 ... edge detection section 16 ... edge position counter 18 ... burst pattern waveform creation section 19 ... pattern superposition Processing unit 20 Frequency measuring unit 21 Gate position counter 22 Measurement section setting unit 23 Input operation guide display output unit 24 Set value display output unit 25 Gate signal creation unit 26 Display range automatic switching unit 27 Display control Department

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification code FI G01R 23/173 G01R 23/173 J (58) Investigated field (Int.Cl. ⁶ , DB name) G01R 23/02 G01R 13 / 30 G01R 23/16 G01R 23/173

Claims (3)

(57) [Claims] An edge position detecting section (1) for receiving a burst signal in which a continuation section in which a carrier signal continues and a section in which the carrier signal is interrupted repeatedly detects a switching position in any section.
5.16) and a burst pattern waveform generator (18) for generating a burst pattern waveform from the switching position of the detected section, and measures the frequency of the carrier signal within the duration of the burst signal according to an operation input. A measurement section setting section (22) for setting a desired measurement section, a gate signal creation section (25) for creating a gate signal indicating the measurement section set in the measurement section setting section, and a creation in the burst pattern waveform creation section. A display device (3, 27) for displaying the set burst pattern waveform, and displaying the set measurement section so as to visually recognize which part of the burst pattern waveform, the gate signal of the burst signal A frequency measuring unit (20) for measuring the frequency of the carrier signal in the measurement section designated by (4) and outputting the measured value to the display device for display. Frequency measurement device. 2. An edge position detecting section for receiving a burst signal in which a continuation section in which a carrier signal continues and a section in which the carrier signal is interrupted, and detects a switching position of any section as an elapsed time from a predetermined time. (15, 16), a burst pattern waveform generator (18) for generating a burst pattern waveform from the switching position of the detected section, and a carrier signal within a burst duration of the burst signal in response to an operation input. A measurement section setting section (22) for setting a measurement section to be measured for the frequency of the pattern, and a pattern overlap for overlapping the pattern of the measurement section setting section and the set measurement section on the burst pattern waveform created by the burst pattern waveform creation section. A processing unit (19), and a display device (3, 3) that displays a burst pattern waveform on which the pattern of the measurement section is superimposed by the pattern superimposition processing unit from the predetermined time. 27) and a frequency measuring unit (20, 25) for measuring the frequency of the carrier signal in the measurement section of the burst signal and displaying the frequency on the display device. 3. A display range automatic switching for automatically switching a display range of the burst pattern waveform in the time direction on the display device according to a time width of each section of the burst pattern waveform created by the burst pattern waveform creating section. The burst signal frequency measuring device according to claim 1 or 2, further comprising a unit (26).