CN103969533A - Audio frequency range scanning system - Google Patents
Audio frequency range scanning system Download PDFInfo
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- CN103969533A CN103969533A CN201410206339.7A CN201410206339A CN103969533A CN 103969533 A CN103969533 A CN 103969533A CN 201410206339 A CN201410206339 A CN 201410206339A CN 103969533 A CN103969533 A CN 103969533A
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- signal conditioning
- conditioning circuit
- dsp chip
- audio frequency
- level signal
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Abstract
The invention discloses an audio frequency range scanning system. The audio frequency range scanning system comprises a display screen, a DSP chip, a first-level signal conditioning circuit, a band elimination network and a second-level signal conditioning circuit. The display screen is used for displaying audio frequency information processed by the DSP chip, and the first-level signal conditioning circuit is connected with a PWM inside the DSP chip and is used for converting single-frequency PWM square wave signals output by the DSP chip into single-frequency sine waves; the second-level signal conditioning circuit is connected with an ADC inside the DSP chip, and the second-level signal conditioning circuit conducts amplitude adjusting on sine wave signals received in the band elimination network to enable the sine wave signals to be between 0 V to 3 V. The audio frequency range scanning system has the advantages that the double levels of signal conditioning circuits conduct shaping on audio frequency signals, the band elimination network, namely, a filtering circuit is added between the double levels of signal conditioning circuits, and therefore interference of noise waves can be reduced to a greater degree; the collected accurate audio frequency information is output onto the display screen after being processed by the DSP chip; the principle of the audio frequency range scanning system is simple and convenient to implement, the audio domain range testing precision is high and development and application are easy.
Description
Technical field
The present invention relates to a kind of audio-frequency test instrument, particularly a kind of audiorange scanning system.
Background technology
In electronic surveying, often run into the problem that impedance operator to network and transport property are measured, wherein transport property comprises gain and attenuation characteristic, amplitude versus frequency characte, phase-frequency characteristic etc.Be used for measuring above-mentioned characteristic instrument we be called frequency-characteristic measuring-testing instrument, be called for short sweep generator.The eliminating of adjustment, calibration and fault that it is tested network provides greatly convenient.
Summary of the invention
The technical problem to be solved in the present invention is: principle of work is easy, audio-frequency test is accurate, be easy to the audiorange scanning system of application.
The technical solution adopted for the present invention to solve the technical problems is: a kind of audiorange scanning system, comprise: display screen, dsp chip, first order signal conditioning circuit, band resistance network and second level signal conditioning circuit, described display screen is for showing through dsp chip audio-frequency information after treatment, described first order signal conditioning circuit is connected with the inside PWM of dsp chip, for the single-frequency PWM square-wave signal of dsp chip output being become to the sine wave of single-frequency; Described band resistance network is connected with second level signal conditioning circuit with first order signal conditioning circuit respectively, described band resistance network receives the sine wave signal of first order signal conditioning circuit output and will carry out filtering to this key player on a team's ripple signal, then purer key player on a team's ripple signal is outputed to second level signal conditioning circuit; Described second level signal conditioning circuit is connected with the inside ADC of dsp chip, and the sine wave signal that is received in band resistance network is carried out amplitude modulation by second level signal conditioning circuit, make key player on a team's ripple signal at 0V between 3V, be unlikely to ADC module to exert an influence.
The invention has the beneficial effects as follows: the signal conditioning circuit of twin-stage carries out shaping to sound signal, between twin-stage signal conditioning circuit, increasing band resistance network is filtering circuit, can reduce greatly the interference of clutter, collect accurate audio-frequency information outputs on display screen after dsp chip is processed, the principle of the invention is easy, range range test precision is high, is easy to application.
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 theory structure schematic diagram of the present invention.
Embodiment
Now by reference to the accompanying drawings and specific embodiment, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, and basic structure of the present invention is only described in a schematic way, and therefore it only shows the formation relevant with the present invention.These embodiment are interpreted as only need not limiting the scope of the invention for the present invention is described.After having read content of the present invention, those skilled in the art can do various amendments to the present invention, and the variation of these equivalences and modification fall into the protection domain that the present invention limits equally.
Audiorange scanning system as shown in Figure 1, comprise: display screen, dsp chip, first order signal conditioning circuit, band resistance network and second level signal conditioning circuit, described display screen is for showing through dsp chip audio-frequency information after treatment, described first order signal conditioning circuit is connected with the inside PWM of dsp chip, for the single-frequency PWM square-wave signal of dsp chip output being become to the sine wave of single-frequency; Described band resistance network is connected with second level signal conditioning circuit with first order signal conditioning circuit respectively, described band resistance network receives the sine wave signal of first order signal conditioning circuit output and will carry out filtering to this key player on a team's ripple signal, then purer key player on a team's ripple signal is outputed to second level signal conditioning circuit; Described second level signal conditioning circuit is connected with the inside ADC of dsp chip, and the sine wave signal that is received in band resistance network is carried out amplitude modulation by second level signal conditioning circuit, make key player on a team's ripple signal at 0V between 3V, be unlikely to ADC module to exert an influence.
Band resistance network kind comprises active band resistance network and passive band resistance network, and wherein, RC rejector circuit is passive band resistance network, and this kind of passive band resistance network only need calculate the size of setting resistance and electric capacity and can use.In active rejection filter, double T rejector circuit network uses comparatively extensive, and it is theoretical and design all comparative maturities.
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 (1)
1. an audiorange scanning system, it is characterized in that: comprising: display screen, dsp chip, first order signal conditioning circuit, band resistance network and second level signal conditioning circuit, described display screen is for showing through dsp chip audio-frequency information after treatment, described first order signal conditioning circuit is connected with the inside PWM of dsp chip, for the single-frequency PWM square-wave signal of dsp chip output being become to the sine wave of single-frequency; Described band resistance network is connected with second level signal conditioning circuit with first order signal conditioning circuit respectively, described band resistance network receives the sine wave signal of first order signal conditioning circuit output and will carry out filtering to this key player on a team's ripple signal, then purer key player on a team's ripple signal is outputed to second level signal conditioning circuit; Described second level signal conditioning circuit is connected with the inside ADC of dsp chip, and the sine wave signal that is received in band resistance network is carried out amplitude modulation by second level signal conditioning circuit, make key player on a team's ripple signal at 0V between 3V, be unlikely to ADC module to exert an influence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410206339.7A CN103969533A (en) | 2014-05-15 | 2014-05-15 | Audio frequency range scanning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410206339.7A CN103969533A (en) | 2014-05-15 | 2014-05-15 | Audio frequency range scanning system |
Publications (1)
| Publication Number | Publication Date |
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| CN103969533A true CN103969533A (en) | 2014-08-06 |
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| CN201410206339.7A Pending CN103969533A (en) | 2014-05-15 | 2014-05-15 | Audio frequency range scanning system |
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Citations (6)
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| US7734848B2 (en) * | 2006-11-08 | 2010-06-08 | Verigy (Singapore) Pte. Ltd. | System and method for frequency offset testing |
| CN102193106A (en) * | 2010-03-18 | 2011-09-21 | 长江大学 | Method for generating frequency sweeping signal special for controllable seismic source |
| CN102468805A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | Sweep signal generator and method for generating sweep signals |
| CN102523596A (en) * | 2011-12-13 | 2012-06-27 | 北京北方烽火科技有限公司 | High speed frequency sweep apparatus and realization method thereof |
| CN102883409A (en) * | 2012-09-21 | 2013-01-16 | 北京北方烽火科技有限公司 | Radio-frequency signal frequency sweeping method and device |
| CN203849344U (en) * | 2014-05-15 | 2014-09-24 | 苏州蓝萃电子科技有限公司 | Audio range scanner |
-
2014
- 2014-05-15 CN CN201410206339.7A patent/CN103969533A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7734848B2 (en) * | 2006-11-08 | 2010-06-08 | Verigy (Singapore) Pte. Ltd. | System and method for frequency offset testing |
| CN102193106A (en) * | 2010-03-18 | 2011-09-21 | 长江大学 | Method for generating frequency sweeping signal special for controllable seismic source |
| CN102468805A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | Sweep signal generator and method for generating sweep signals |
| CN102523596A (en) * | 2011-12-13 | 2012-06-27 | 北京北方烽火科技有限公司 | High speed frequency sweep apparatus and realization method thereof |
| CN102883409A (en) * | 2012-09-21 | 2013-01-16 | 北京北方烽火科技有限公司 | Radio-frequency signal frequency sweeping method and device |
| CN203849344U (en) * | 2014-05-15 | 2014-09-24 | 苏州蓝萃电子科技有限公司 | Audio range scanner |
Non-Patent Citations (2)
| Title |
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| 何苏勤等: "基于TMS320F2808的音频频率数字扫频仪", 《实验技术与管理》, vol. 28, no. 02, 28 February 2011 (2011-02-28) * |
| 林伟民等: "基于TMS320F2812 DSP的音频数字扫频仪研制", 《信息化研究》, vol. 37, no. 01, 31 January 2011 (2011-01-31) * |
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Application publication date: 20140806 |