CN103973259A - Simple second-order band-pass filter for audio near field communication - Google Patents
Simple second-order band-pass filter for audio near field communication Download PDFInfo
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- CN103973259A CN103973259A CN201310045182.XA CN201310045182A CN103973259A CN 103973259 A CN103973259 A CN 103973259A CN 201310045182 A CN201310045182 A CN 201310045182A CN 103973259 A CN103973259 A CN 103973259A
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- resistance
- pass filter
- amplifier
- resistor
- electric capacity
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Abstract
The invention discloses a simple second-order band-pass filter for audio near field communication. The first end of a first resistor is connected with the first end of a first capacitor, the first end of a second capacitor and the first end of a fourth resistor, the second end of the first capacitor is connected with the positive signal input end of an amplifier and the first end of a second resistor, the negative signal input end of the amplifier is connected with the first end of a fifth resistor and the first end of a third resistor, the output end of the amplifier is connected with the second end of the fourth resistor and the second end of the fifth resistor, and the second end of the second resistor is connected with the second end of the third resistor and the second end of the second capacitor. The second end of the first resistor serves as the positive input end of the band-pass filter, the output end of the amplifier servers as the positive output end of the band-pass filter, and the second end of the second capacitor serves as the negative input end and the negative output end of the band-pass filter at the same. The band-pass filter is simple in structure and low in cost and has an amplification function.
Description
Technical field
The present invention relates to a kind of band pass filter, relate in particular to a kind of simple and easy second-order bandpass filter paying for audio frequency near field.
Background technology
Audio frequency near field payment technology be the applicant's a kind of utilization of proposing and applying for a patent closely audio transmission information to complete the technology of payment function, it utilizes the audio frequency R-T unit realization that the conventional equipments such as mobile phone carry to pay, and has advantages of and pays quick, easily enforcement, easily universal.In the payment technology of audio frequency near field, in the sending and receiving process of audio frequency, all need to use band pass filter, traditional band pass filter is in order to realize arrowband, adopting quantity to reach ten above elements connects, its complex structure, cost are high, cause the application of conventional band-pass filters in audio frequency near field pays limited.
Summary of the invention
Object of the present invention be just to provide in order to address the above problem a kind of simple in structure, cost is low and have the simple and easy second-order bandpass filter paying for audio frequency near field of amplification concurrently.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The simple and easy second-order bandpass filter paying for audio frequency near field of the present invention, comprise amplifier, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity and the second electric capacity, the first end of described the first resistance respectively with the first end of described the first electric capacity, the first end of described the second electric capacity is connected with the first end of described the 4th resistance, the second end of described the first electric capacity is connected with the positive signal input of described amplifier and the first end of described the second resistance respectively, the negative input of described amplifier is connected with the first end of described the 5th resistance and the first end of described the 3rd resistance respectively, the output of described amplifier is connected with the second end of described the 4th resistance and the second end of described the 5th resistance respectively, the second end of described the second resistance is connected with the second end of described the 3rd resistance and the second end of described the second electric capacity respectively, the electrode input end that the second end of described the first resistance is described band pass filter, the output of described amplifier is the cathode output end of described band pass filter, and the second end of described the second electric capacity is negative input and the cathode output end of described band pass filter simultaneously.
Beneficial effect of the present invention is:
The present invention utilizes the first resistance and the second electric capacity composition low-pass network, the first electric capacity and the second resistance composition high pass network, amplifier, the 3rd resistance and the 5th resistance form ratio amplifying circuit in the same way, make simple and easy second-order bandpass filter of the present invention have advantages of simple in structure, cost is low and have amplification concurrently.
Brief description of the drawings
Fig. 1 is the circuit diagram of simple and easy second-order bandpass filter of the present invention;
Fig. 2 is the system architecture diagram of sound intermediate frequency of the present invention near field payment system;
Fig. 3 is the circuit structure block diagram of the voice frequency sender of sound intermediate frequency of the present invention near field payment system;
Fig. 4 is the circuit structure block diagram of the audio receiver of sound intermediate frequency of the present invention near field payment system.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 2, Figure 3 and Figure 4, audio frequency near field payment system in the payment technology of audio frequency near field comprises that multiple (in Fig. 2, having illustrated 4) can be mutually by the voice frequency terminal of voice communication, this voice frequency terminal can be the mobile terminals such as mobile phone, can be also the fixed terminals such as payment platform.Each voice frequency terminal comprises voice frequency sender and audio receiver, voice frequency sender comprises encoder for convolution codes, modulator, band pass filter, D/A change-over circuit, amplifirer and the loud speaker of series connection successively, the input input Applied Digital data-signal of encoder for convolution codes, the information medium of loud speaker output sound signal for paying as near field; Audio receiver comprises microphone, A/D change-over circuit, band pass filter, demodulator, low pass filter and the convolutional code decoder device of series connection successively, the voice signal that the input of the input of microphone is transmitted by loud speaker, the output output Applied Digital data-signal of convolutional code decoder device.
As shown in Figure 1, above-mentioned band pass filter comprises amplifier A, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the first capacitor C 1 and the second capacitor C 2, the first end of the first resistance R 1 respectively with the first end of the first capacitor C 1, the first end of the second capacitor C 2 is connected with the first end of the 4th resistance R 4, the second end of the first capacitor C 1 is connected with the positive signal input of amplifier A and the first end of the second resistance R 2 respectively, the negative input of amplifier A is connected with the first end of the 5th resistance R 5 and the first end of the 3rd resistance R 3 respectively, the output of amplifier A is connected with the second end of the 4th resistance R 4 and the second end of the 5th resistance R 5 respectively, the second end of the second resistance R 2 is connected with the second end of the 3rd resistance R 3 and the second end of the second capacitor C 2 respectively, the electrode input end that the second end of the first resistance R 1 is described band pass filter, the cathode output end that the output of amplifier A is described band pass filter, the second end of the second capacitor C 2 is negative input and the cathode output end of described band pass filter simultaneously, in figure, the second end of the second end of the first resistance R 1 and the second capacitor C 2 forms the input Uin of described band pass filter, and the second end of the output of amplifier A and the second capacitor C 2 forms the output Uout of described band pass filter.
The present invention utilizes the first resistance R 1 and the second capacitor C 2 to form low-pass network, the first capacitor C 1 and the second resistance R 2 form high pass network, amplifier A, the 3rd resistance R 3 and the 5th resistance R 5 form ratio amplifying circuit in the same way, make simple and easy second-order bandpass filter of the present invention have advantages of simple in structure, cost is low and have amplification concurrently.
Claims (1)
1. the simple and easy second-order bandpass filter paying for audio frequency near field, it is characterized in that: comprise amplifier, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first electric capacity and the second electric capacity, the first end of described the first resistance respectively with the first end of described the first electric capacity, the first end of described the second electric capacity is connected with the first end of described the 4th resistance, the second end of described the first electric capacity is connected with the positive signal input of described amplifier and the first end of described the second resistance respectively, the negative input of described amplifier is connected with the first end of described the 5th resistance and the first end of described the 3rd resistance respectively, the output of described amplifier is connected with the second end of described the 4th resistance and the second end of described the 5th resistance respectively, the second end of described the second resistance is connected with the second end of described the 3rd resistance and the second end of described the second electric capacity respectively, the electrode input end that the second end of described the first resistance is described band pass filter, the output of described amplifier is the cathode output end of described band pass filter, and the second end of described the second electric capacity is negative input and the cathode output end of described band pass filter simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310045182.XA CN103973259A (en) | 2013-02-05 | 2013-02-05 | Simple second-order band-pass filter for audio near field communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310045182.XA CN103973259A (en) | 2013-02-05 | 2013-02-05 | Simple second-order band-pass filter for audio near field communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103973259A true CN103973259A (en) | 2014-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310045182.XA Pending CN103973259A (en) | 2013-02-05 | 2013-02-05 | Simple second-order band-pass filter for audio near field communication |
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| CN (1) | CN103973259A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201606059U (en) * | 2009-12-14 | 2010-10-13 | 西安威尔罗根能源科技有限公司 | Power supply circuit of microsphere focused logging main current |
| CN201638373U (en) * | 2009-12-31 | 2010-11-17 | 潍坊国建高创科技有限公司 | Zigbee radio frequency transceiver for transmitting thermodynamic data |
| CN201697649U (en) * | 2010-05-04 | 2011-01-05 | 山东汇和高创供热节能科技有限公司 | Wave filter circuit of steam flow rate meter |
| CN203104372U (en) * | 2013-02-05 | 2013-07-31 | 成都摩宝网络科技有限公司 | Simple two-stage band-pass filter for audio near field payment |
-
2013
- 2013-02-05 CN CN201310045182.XA patent/CN103973259A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201606059U (en) * | 2009-12-14 | 2010-10-13 | 西安威尔罗根能源科技有限公司 | Power supply circuit of microsphere focused logging main current |
| CN201638373U (en) * | 2009-12-31 | 2010-11-17 | 潍坊国建高创科技有限公司 | Zigbee radio frequency transceiver for transmitting thermodynamic data |
| CN201697649U (en) * | 2010-05-04 | 2011-01-05 | 山东汇和高创供热节能科技有限公司 | Wave filter circuit of steam flow rate meter |
| CN203104372U (en) * | 2013-02-05 | 2013-07-31 | 成都摩宝网络科技有限公司 | Simple two-stage band-pass filter for audio near field payment |
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Application publication date: 20140806 |
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| WD01 | Invention patent application deemed withdrawn after publication |