CN103901272A - Digital frequency meter - Google Patents
Digital frequency meter Download PDFInfo
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- CN103901272A CN103901272A CN201410164401.0A CN201410164401A CN103901272A CN 103901272 A CN103901272 A CN 103901272A CN 201410164401 A CN201410164401 A CN 201410164401A CN 103901272 A CN103901272 A CN 103901272A
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Abstract
The invention discloses a digital frequency meter which comprises a DSP chip, a power management module, a shaping circuit, a clock circuit, a reset circuit, a JTAG interface and a communication module, wherein the DSP chip is connected with the power management module, the shaping circuit, the clock circuit, the reset circuit, the JTAG interface and the communication module, and the DSP chip, the clock circuit, the reset circuit and the JTAG interface form a DSP minimum system. The digital frequency meter has the advantages of that the digital frequency meter is simple in structure and practical, shaping of the detected signal is achieved by means of a high-speed comparator, there is no requirement for polarity of the detected signal, and the expansion range is wide.
Description
Technical field
The present invention relates to smart electronics instrument field, be specifically related to a kind of digital frequency meter.
Background technology
Digital frequency meter is to adopt the instrument of realizing of being made into of digital circuit to the measurement of cyclical variation signal frequency.Frequency meter is mainly used in measuring the frequency values of the periodic signals such as sine wave, square wave, triangular wave and spike pulse.Its expanded function can measuring-signal cycle and pulse width.Conventionally say, digital frequency meter refers to electronic counter type frequency meter.
Digital frequency meter is the indispensable surveying instruments in research and production field such as computing machine, communication apparatus, audio frequency and video.It is decimally numeral of one, shows the digital measurement instrument of measured signal frequency.Its basic function is to measure sinusoidal signal, the physical quantity changing in square-wave signal and other various unit interval.Simulating, in the design of digital circuit, installation, debug process, because using decimal number, it shows, and measure rapidly, precision is high, and intuitive display, so often will use digital frequency meter.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of circuit structure is simple, practical, shaping to measured signal, and polarity no requirement (NR) to measured signal, the digital frequency meter that spreading range is wide.
The technical solution adopted for the present invention to solve the technical problems is: digital frequency meter, comprise: dsp chip, power management module, shaping circuit, clock circuit, reset circuit, jtag interface, communication module, described dsp chip is connected with power management module, shaping circuit, clock circuit, reset circuit, jtag interface, communication module respectively, and described dsp chip, clock circuit, reset circuit, jtag interface form DSP minimum system.
As preferred version, described communication module is RS232 interface, and described RS232 interface is connected with peripheral computer and communicates with keyboard and the display of described computing machine.
As preferred version, described reset circuit is manual reset circuit.
As preferred version, described dsp chip is TMS320F2812 chip.
As preferred version, described power management module comprises a linear voltage-stabilizing circuit and a DC/DC converter.
As preferred version, described shaping circuit comprises a TL3016ID comparer.
Digital frequency meter is the indispensable surveying instruments in research and production field such as computing machine, communication apparatus, audio frequency and video.It is decimally numeral of one, shows the digital measurement instrument of measured signal frequency.Its basic function is to measure sinusoidal signal, the physical quantity changing in square-wave signal and other various unit interval.Simulating, in the design of digital circuit, installation, debug process, because using decimal number, it shows, and measure rapidly, precision is high, and intuitive display, so often will use digital frequency meter.The good effect that the present invention obtains is: this digital frequency meter is simple in structure, practical, adopt high-speed comparator to realize the shaping of measured signal, and polarity no requirement (NR) to measured signal, and spreading range is wide.
Brief description of the drawings
For the clearer explanation embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is schematic circuit schematic diagram of the present invention.
Fig. 2 is that shaping circuit part of the present invention is implemented illustration.
Fig. 3 is that communication module partial circuit of the present invention connects enforcement illustration.
Fig. 4 is the specific embodiment figure of power management module of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on embodiments of the invention, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, are all to belong to the scope of protection of the invention.
One-piece construction schematic diagram of the present invention as shown in Figure 1, digital frequency meter, comprise: dsp chip, power management module, shaping circuit, clock circuit, reset circuit, jtag interface, communication module, described dsp chip is connected with power management module, shaping circuit, clock circuit, reset circuit, jtag interface, communication module respectively, and described dsp chip, clock circuit, reset circuit, jtag interface form DSP minimum system.Dsp chip in minimum system can be selected TMS320F2812 chip, signal processing module is taking dsp chip TMS320F2812 as core, TMS320F2812 contains abundant On-Chip peripheral resource, as ADC, task manager, PIE, house dog, SCI, SPI etc., without extending out ROM, in minimum system, TMS320F2812 coordinates orderly work and the signal processing tasks of the each module of whole system.Reset circuit adopts resistance-capacitance type circuit, carries out hand-reset to facilitate, and JTAG mouth facilitates debugging and the programming of program.
Shaping circuit schematic diagram as shown in Figure 2, select the high-performance comparer TL3016ID of TI company release as the main devices of shaping circuit, this comparer be a support+5V and-high-speed comparator of 5V dual power supply, when input end+input voltage higher than reference edge-voltage time, it is output as 3.6-3.9V level, when input terminal voltage is during lower than reference voltage, it is output as 500-600mV level.In order to make circuit not only can measure bipolar signal, can also measure unipolar signal, with reference to suitable the raising of terminal voltage, reference voltage v gets about 0.2V, is that 13K ohm, the electric resistance partial pressure of 510 ohm obtain by resistance.Select high-speed schmitt trigger SN74LVC1G14 to carry out amplitude limit and further shaping to signal amplitude, this trigger power supply is connect to digital 3.3V voltage, its forward threshold voltage VT+ is 1.8V left and right, reverse voltage is 1V left and right, in the time of signal positive change, trigger output 3.3V level in the time that signal is greater than 1.8V, trigger output 0V low level in the time that signals reverse changes.It is that the resistance of 100 ohm carries out impedance matching that the TCLKINA pin that signal after this trigger shaping can directly be sent into DSP accesses resistance between comparer and Schmidt trigger.In figure, the effect of reference edge electric capacity is the filtering to supply voltage, and opposing is from the noise of power supply.At the other decoupling capacitor of all wanting a 0.1 micro-F in parallel of power pins of each active device, play the effect of filtering ripple and bypassing the high frequency noise of this device in addition.
Communication module is connected to the SCI module of TMS320F2812, carries out serial communication by 9 core standard RS-232 mouths and other system.Select SCIA on TMS320F2812 sheet as serial communication interface, to select the main devices of MAX3221 as serial communication signals level switch module, concrete connecting circuit figure is shown in Figure 3.
Power management module is mainly made up of linear voltage-stabilizing circuit and DC/DC converter as Fig. 4, because power management module input signal is bipolarity, comparer TL3016ID requires again negative and positive dual power power supply, therefore this system use+12V and-12V dual power supply, in order to reduce the impact of numerical portion on simulation part, in system by digital power and analog power, digitally with in analog separate, in analog with digitally connect 0 Ohmage.
Above content combines embodiment accompanying drawing specific embodiments of the invention has been made to detailed description.In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the wide region consistent with principle disclosed herein and novel features.
Claims (6)
1. a digital frequency meter, it is characterized in that: comprising: dsp chip, power management module, shaping circuit, clock circuit, reset circuit, jtag interface, communication module, described dsp chip is connected with power management module, shaping circuit, clock circuit, reset circuit, jtag interface, communication module respectively, and described dsp chip, clock circuit, reset circuit, jtag interface form DSP minimum system.
2. digital frequency meter according to claim 1, is characterized in that: described communication module is RS232 interface, and described RS232 interface is connected with peripheral computer and communicates with keyboard and the display of described computing machine.
3. digital frequency meter according to claim 1, is characterized in that: described reset circuit is manual reset circuit.
4. digital frequency meter according to claim 1, is characterized in that: described dsp chip is TMS320F2812 chip.
5. digital frequency meter according to claim 1, is characterized in that: described power management module comprises a linear voltage-stabilizing circuit and a DC/DC converter.
6. digital frequency meter according to claim 1, is characterized in that: described shaping circuit comprises a TL3016ID comparer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410164401.0A CN103901272A (en) | 2014-04-20 | 2014-04-20 | Digital frequency meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410164401.0A CN103901272A (en) | 2014-04-20 | 2014-04-20 | Digital frequency meter |
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| CN103901272A true CN103901272A (en) | 2014-07-02 |
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| CN201410164401.0A Pending CN103901272A (en) | 2014-04-20 | 2014-04-20 | Digital frequency meter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116217A (en) * | 2015-09-02 | 2015-12-02 | 盐城工学院 | Single-chip microcomputer-based weak signal frequency and phase automatic detection system and detection method thereof |
| CN105823925A (en) * | 2016-05-12 | 2016-08-03 | 南京信息工程大学 | Equal precision digital frequency meter and measuring method thereof |
| CN108761183A (en) * | 2018-05-08 | 2018-11-06 | 国网福建省电力有限公司三明供电公司 | A kind of multi-functional decibel meter of power communication |
| CN112362964A (en) * | 2020-10-26 | 2021-02-12 | 广东电网有限责任公司 | Voltage frequency measuring device and method |
| CN112748283A (en) * | 2020-12-29 | 2021-05-04 | 成都前锋电子仪器有限责任公司 | Audio signal sampling method, main control chip and audio module thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105116217A (en) * | 2015-09-02 | 2015-12-02 | 盐城工学院 | Single-chip microcomputer-based weak signal frequency and phase automatic detection system and detection method thereof |
| CN105823925A (en) * | 2016-05-12 | 2016-08-03 | 南京信息工程大学 | Equal precision digital frequency meter and measuring method thereof |
| CN108761183A (en) * | 2018-05-08 | 2018-11-06 | 国网福建省电力有限公司三明供电公司 | A kind of multi-functional decibel meter of power communication |
| CN112362964A (en) * | 2020-10-26 | 2021-02-12 | 广东电网有限责任公司 | Voltage frequency measuring device and method |
| CN112748283A (en) * | 2020-12-29 | 2021-05-04 | 成都前锋电子仪器有限责任公司 | Audio signal sampling method, main control chip and audio module thereof |
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Application publication date: 20140702 |