CN203057465U - Filtering noise-reduction audio frequency circuit - Google Patents
Filtering noise-reduction audio frequency circuit Download PDFInfo
- Publication number
- CN203057465U CN203057465U CN 201320001035 CN201320001035U CN203057465U CN 203057465 U CN203057465 U CN 203057465U CN 201320001035 CN201320001035 CN 201320001035 CN 201320001035 U CN201320001035 U CN 201320001035U CN 203057465 U CN203057465 U CN 203057465U
- Authority
- CN
- China
- Prior art keywords
- operational amplifier
- capacitor
- resistance
- inverting input
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Amplifiers (AREA)
- Networks Using Active Elements (AREA)
Abstract
The utility model discloses a filtering noise-reduction audio frequency circuit, and mainly solves problems of complex structure and high cost for reducing noises of an audio frequency device in the prior art. The filtering noise-reduction audio frequency circuit comprises an operational amplifier T1 with a non-inverting input terminal connected with a resistor R1 and capacitor C1, a capacitor C4 connected with an inverting input terminal of the operational amplifier T1, a resistor R2 and a resistor R3 respectively connected with an input terminal and an output terminal of the capacitor C4, an inductor L3 connected with the operational amplifier T1 through a resistor R5, an inductor L2 and a capacitor C3, an operational amplifier T2 with a non-inverting input terminal connected with an output terminal of the inductor L3 through a capacitor C5 and an inductor L1, and an operational amplifier T3 with an output terminal connected with an output terminal of the operational amplifier T2 through a horn U1, wherein the resistor R5, the inductor L2 and the capacitor C3 are connected in parallel between an output terminal and the inverting input terminal of the operational amplifier T1. Through employing the scheme, the filtering noise-reduction audio frequency circuit obtains purposes of good anti-interference capability and low cost, and has very high practical value and promotion value.
Description
Technical field
The utility model relates to a kind of voicefrequency circuit, specifically, relates to a kind of filtering noise reduction audio circuit.
Background technology
The audio frequency device is device indispensable in the audio frequency apparatus, in order to improve the audio of audio frequency device, often needs to connect in addition filter, and overall volume is bigger in the time of can causing use like this, and cost is higher, is unfavorable for some mini-plant uses cheaply.
The utility model content
The purpose of this utility model is to provide a kind of filtering noise reduction audio circuit, mainly solves the audio frequency device complex structure that exists in the prior art, the cost problem of higher.
To achieve these goals, the technical solution adopted in the utility model is as follows:
A kind of filtering noise reduction audio circuit, comprise that in-phase input end is connected with the operational amplifier T1 of resistance R 1 and capacitor C 1, the capacitor C 4 that links to each other with the inverting input of operational amplifier T1, be connected to resistance R 2 and the resistance R 3 of input and the output of capacitor C 4, by output and the resistance R between the inverting input 5 that is parallel to operational amplifier T1, the inductance L 3 that inductance L 2 and capacitor C 3 link to each other with operational amplifier T1, in-phase input end is by capacitor C 5, the operational amplifier T2 that inductance L 1 links to each other with the output of inductance L 3, the operational amplifier T3 that output links to each other with the output of operational amplifier T2 by loudspeaker U1.
Specifically, also be connected with resistance R 4 between the inverting input of described resistance R 5 and operational amplifier T1, also be connected with capacitor C 2 between the output of the output of resistance R 5 and inductance L 2, inductance L 1 two ends also are parallel with capacitor C 9.
The in-phase input end of described operational amplifier T2 links to each other with the input of capacitor C 9 by resistance R 7, capacitor C 6, the resistance R 6 that links to each other successively.
The output of described operational amplifier T2 links to each other by resistance R 8 with inverting input, the output of operational amplifier T3 links to each other by resistance R 10 with inverting input, and the inverting input of operational amplifier T2 and operational amplifier T3 links to each other with resistance R 9 by capacitor C 7.
Compared with prior art, the utlity model has following beneficial effect:
(1) the utility model is designed to one with audio frequency front end circuit, filter circuit, voicefrequency circuit, and has selected for use the components and parts that cost is minimum, effect is best to carry out circuit design according to actual conditions, accords with the demands of the market.
(2) the low noise circuit has improved the antijamming capability when using greatly as the audio frequency front end circuit in the utility model, has improved audio.
(3) the utility model is simple in structure, uses less components and parts to realize decrease of noise functions, and with low cost, volume is small and exquisite, is fit to large-scale promotion application.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples, and execution mode of the present utility model includes but not limited to the following example.
Embodiment
As shown in Figure 1, the utility model discloses a kind of filtering noise reduction audio circuit, comprise that in-phase input end is connected with the operational amplifier T1 of resistance R 1 and capacitor C 1, the capacitor C 4 that links to each other with the inverting input of operational amplifier T1, be connected to resistance R 2 and the resistance R 3 of input and the output of capacitor C 4, by output and the resistance R between the inverting input 5 that is parallel to operational amplifier T1, the inductance L 3 that inductance L 2 and capacitor C 3 link to each other with operational amplifier T1, in-phase input end is by capacitor C 5, the operational amplifier T2 that inductance L 1 links to each other with the output of inductance L 3, the operational amplifier T3 that output links to each other with the output of operational amplifier T2 by loudspeaker U1.
Specifically, also be connected with resistance R 4 between the inverting input of described resistance R 5 and operational amplifier T1, also be connected with capacitor C 2 between the output of the output of resistance R 5 and inductance L 2, inductance L 1 two ends also are parallel with capacitor C 9.
The in-phase input end of described operational amplifier T2 links to each other with the input of capacitor C 9 by resistance R 7, capacitor C 6, the resistance R 6 that links to each other successively.
The output of described operational amplifier T2 links to each other by resistance R 8 with inverting input, the output of operational amplifier T3 links to each other by resistance R 10 with inverting input, and the inverting input of operational amplifier T2 and operational amplifier T3 links to each other with resistance R 9 by capacitor C 7.
According to above-described embodiment, just can realize the utility model well.
Claims (4)
1. filtering noise reduction audio circuit, it is characterized in that, comprise that in-phase input end is connected with the operational amplifier T1 of resistance R 1 and capacitor C 1, the capacitor C 4 that links to each other with the inverting input of operational amplifier T1, be connected to resistance R 2 and the resistance R 3 of input and the output of capacitor C 4, by output and the resistance R between the inverting input 5 that is parallel to operational amplifier T1, the inductance L 3 that inductance L 2 and capacitor C 3 link to each other with operational amplifier T1, in-phase input end is by capacitor C 5, the operational amplifier T2 that inductance L 1 links to each other with the output of inductance L 3, the operational amplifier T3 that output links to each other with the output of operational amplifier T2 by loudspeaker U1.
2. a kind of filtering noise reduction audio circuit according to claim 1, it is characterized in that, also be connected with resistance R 4 between the inverting input of described resistance R 5 and operational amplifier T1, also be connected with capacitor C 2 between the output of the output of resistance R 5 and inductance L 2, inductance L 1 two ends also are parallel with capacitor C 9.
3. a kind of filtering noise reduction audio circuit according to claim 2 is characterized in that, the in-phase input end of described operational amplifier T2 links to each other with the input of capacitor C 9 by resistance R 7, capacitor C 6, the resistance R 6 that links to each other successively.
4. a kind of filtering noise reduction audio circuit according to claim 3, it is characterized in that, the output of described operational amplifier T2 links to each other by resistance R 8 with inverting input, the output of operational amplifier T3 links to each other by resistance R 10 with inverting input, and the inverting input of operational amplifier T2 and operational amplifier T3 links to each other with resistance R 9 by capacitor C 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320001035 CN203057465U (en) | 2013-01-05 | 2013-01-05 | Filtering noise-reduction audio frequency circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320001035 CN203057465U (en) | 2013-01-05 | 2013-01-05 | Filtering noise-reduction audio frequency circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203057465U true CN203057465U (en) | 2013-07-10 |
Family
ID=48740378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320001035 Expired - Fee Related CN203057465U (en) | 2013-01-05 | 2013-01-05 | Filtering noise-reduction audio frequency circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203057465U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108882114A (en) * | 2018-07-09 | 2018-11-23 | 商洛学院 | A kind of audio transmission de-noising processor |
-
2013
- 2013-01-05 CN CN 201320001035 patent/CN203057465U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108882114A (en) * | 2018-07-09 | 2018-11-23 | 商洛学院 | A kind of audio transmission de-noising processor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203416230U (en) | Filter | |
| CN203057465U (en) | Filtering noise-reduction audio frequency circuit | |
| CN203057469U (en) | Noise reduction audio frequency device | |
| CN203027453U (en) | Filtering and denoising audio circuit | |
| CN203057464U (en) | Dynamic filtering sounding device | |
| CN203057472U (en) | Dual-noise reduction sounding device | |
| CN203057467U (en) | Low noise vocal apparatus | |
| CN203057474U (en) | Sounding device with dual-filtering function | |
| CN202634379U (en) | Direct-current coupling low-pass RC (remote control) active filter | |
| CN203027448U (en) | Audio device with noise reduction function | |
| CN203027455U (en) | Dynamic filtering sounding device | |
| CN203289417U (en) | Noise reduction type audio signal receiver | |
| CN203057473U (en) | Active audio frequency amplifying circuit | |
| CN203027449U (en) | Interference-resisting sounding device | |
| CN203057481U (en) | Anti-interference vocal apparatus | |
| CN203313128U (en) | Novel infrared amplifying circuit | |
| CN203057466U (en) | Low noise active audio frequency machine | |
| CN203027450U (en) | Low-noise active audio machine | |
| CN204068895U (en) | For the active filter of mobile phone | |
| CN203057082U (en) | Voice frequency amplifying circuit with filtering function | |
| CN203027463U (en) | Audio machine with voice crack preventing function | |
| CN203057475U (en) | Sounding circuit with filtering function | |
| CN203057470U (en) | Filtering type active sounding device | |
| CN204104105U (en) | A kind of circuit of Earphone Amplifier | |
| CN203057471U (en) | Anti-interference loudspeaking circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20140105 |