CN208609170U - A kind of Audio Frequency Analyser - Google Patents
A kind of Audio Frequency Analyser Download PDFInfo
- Publication number
- CN208609170U CN208609170U CN201821445691.6U CN201821445691U CN208609170U CN 208609170 U CN208609170 U CN 208609170U CN 201821445691 U CN201821445691 U CN 201821445691U CN 208609170 U CN208609170 U CN 208609170U
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- China
- Prior art keywords
- audio frequency
- fpga
- input terminal
- output end
- filter
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Abstract
The utility model relates to audio frequency apparatus technical fields, and in particular to a kind of Audio Frequency Analyser.The utility model is based on FPGA and is embedded in Nios, realizes the audio signal analysis based on FFT.Including variable gain amplifier, gain control module, frequency overlapped-resistable filter, AD conversion module, FPGA, IIR wave digital lowpass filter, Nios II, display module, the variable gain amplifier is connected to gain control module；The output end of the variable gain amplifier is connected to the input terminal of frequency overlapped-resistable filter；The output end of the frequency overlapped-resistable filter is connected to the input terminal of AD conversion module；The output end of the AD conversion module is connected to the input terminal of FPGA；The output end of the FPGA is connected to the input terminal of display module, realizes high-precision measurement.
Description
Technical field
The utility model relates to audio frequency apparatus technical fields, and in particular to a kind of Audio Frequency Analyser.
Background technique
Audio Frequency Analyser is that one kind can be used for analyzing the parameters such as low frequency signal amplitude, frequency, signal-to-noise ratio, the distortion factor
Important equipment.Current Audio Frequency Analyser, it is integrated, intelligent higher and higher, however output impedance is fixed, nothing
Method adapts to the requirement of different loads, it is difficult to ensure that the undistorted transmission of signal, and output power is small, and load capacity is poor, I
Devise the Audio Frequency Analyser of high-precision, high performance-price ratio a kind of.
Summary of the invention
The purpose of this utility model is to provide a kind of Audio Frequency Analyser for the above prior art deficiency.
To achieve the goals above, the technical scheme adopted by the utility model is a kind of Audio Frequency Analyser, including
Variable gain amplifier, gain control module, frequency overlapped-resistable filter, AD conversion module, FPGA, IIR wave digital lowpass filter,
Nios II, display module, the variable gain amplifier are connected to gain control module；The output of the variable gain amplifier
End is connected to the input terminal of frequency overlapped-resistable filter；The output end of the frequency overlapped-resistable filter is connected to the input of AD conversion module
End；The output end of the AD conversion module is connected to the input terminal of FPGA；The output end of the FPGA is connected to display module
Input terminal.
A kind of above-mentioned Audio Frequency Analyser, the variable gain amplifier use NE5532.
A kind of above-mentioned Audio Frequency Analyser, the frequency overlapped-resistable filter use filtering chip MAX263.
A kind of above-mentioned Audio Frequency Analyser, the AD conversion module have used 12 A/D chip AD1674.
A kind of above-mentioned Audio Frequency Analyser has IIR wave digital lowpass filter in the FPGA and is embedded in Nios.
A kind of above-mentioned Audio Frequency Analyser, the display module have used 12864 liquid crystal.
The utility model has the beneficial effects that the utility model is the digital frequency spectrum analyzer based on FFT.It is convenient
The various information of audio signal to be detected are obtained, amplification factor is adjustable and measurement accuracy is high.Nios is embedded in FPGA
II processor, by software realization, cost is reduced, and peripheral circuit is less, also reduces production process and cost.
Detailed description of the invention
The utility model is specifically described below by attached drawing and in conjunction with example, and the advantages of the utility model and implementation will
Can be more obvious, wherein content shown in attached drawing is only used for the explanation to the utility model, without constituting to the utility model
In all senses on limitation.
Fig. 1 is a kind of structural schematic diagram of Audio Frequency Analyser of the utility model；
Description of symbols: 1, variable gain amplifier；2, gain control module；3, frequency overlapped-resistable filter；4, AD conversion
Module；5,FPGA；6, IIR wave digital lowpass filter；7,Nios II ；8, display module.
Specific embodiment
Elaborate below to the embodiments of the present invention: the present embodiment before being with technical solutions of the utility model
It puts and is implemented, the detailed implementation method and specific operation process are given.It should be pointed out that the common of this field
For technical staff, without departing from the concept of the premise utility, several variations and modifications can also be made, these all belong to
In scope of protection of the utility model.
The utility model is described in detail below referring to Figure of description:
As shown in Figure 1, a kind of Audio Frequency Analyser, including variable gain amplifier, gain control module, anti-aliasing filter
Wave device, AD conversion module, FPGA, IIR wave digital lowpass filter, Nios II, display module, the variable gain amplifier connection
Gain control module；The output end of the variable gain amplifier is connected to the input terminal of frequency overlapped-resistable filter；It is described anti-mixed
The output end of folded filter is connected to the input terminal of AD conversion module；The output end of the AD conversion module is connected to the defeated of FPGA
Enter end；The output end of the FPGA is connected to the input terminal of display module.
Further, the variable gain amplifier uses NE5532.
Further, the frequency overlapped-resistable filter uses filtering chip MAX263.
Further, the AD conversion module has used 12 A/D chip AD1674.
Further, there is IIR wave digital lowpass filter in the FPGA and be embedded at high performance embedded IP kernel (Nios)
Manage the soft core of device.
Further, the display module has used 12864 liquid crystal.
Working principle of the utility model is:
The utility model is based on FPGA and is embedded in Nios, realizes the audio signal analysis based on FFT.Based on FFT
Digital frequency spectrum analyzer.Facilitate the various information for obtaining audio signal to be detected, is clearly shown by LCD, amplifying circuit
It is divided into several shelves, amplification factor is adjustable and measurement accuracy is high.It is embedded in Nios II processor in FPGA, passes through software
It realizes, cost reduces, and peripheral circuit is less, also reduces production process and cost.
Claims (6)
1. a kind of Audio Frequency Analyser, it is characterised in that: the Audio Frequency Analyser includes variable gain amplifier, gain
Control module, frequency overlapped-resistable filter, AD conversion module, FPGA, IIR wave digital lowpass filter, Nios II, display module, it is described
Variable gain amplifier is connected to gain control module；The output end of the variable gain amplifier is connected to frequency overlapped-resistable filter
Input terminal；The output end of the frequency overlapped-resistable filter is connected to the input terminal of AD conversion module；The AD conversion module it is defeated
Outlet is connected to the input terminal of FPGA；The output end of the FPGA is connected to the input terminal of display module.
2. a kind of Audio Frequency Analyser according to claim 1, it is characterised in that: the variable gain amplifier uses
NE5532。
3. a kind of Audio Frequency Analyser according to claim 1, it is characterised in that: the frequency overlapped-resistable filter uses filter
Wave chip MAX263.
4. a kind of Audio Frequency Analyser according to claim 1, it is characterised in that: the AD conversion module has used 12
The A/D chip AD1674 of position.
5. a kind of Audio Frequency Analyser according to claim 1, it is characterised in that: there is IIR number low in the FPGA
Bandpass filter is simultaneously embedded in high performance embedded IP kernel (Nios) processor soft core.
6. a kind of Audio Frequency Analyser according to claim 1, it is characterised in that: the display module uses
12864 liquid crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821445691.6U CN208609170U (en) | 2018-09-05 | 2018-09-05 | A kind of Audio Frequency Analyser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821445691.6U CN208609170U (en) | 2018-09-05 | 2018-09-05 | A kind of Audio Frequency Analyser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208609170U true CN208609170U (en) | 2019-03-15 |
Family
ID=65680050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821445691.6U Expired - Fee Related CN208609170U (en) | 2018-09-05 | 2018-09-05 | A kind of Audio Frequency Analyser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208609170U (en) |
-
2018
- 2018-09-05 CN CN201821445691.6U patent/CN208609170U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190315 Termination date: 20190905 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |