CN106849901A - A kind of audio filter circuit - Google Patents
A kind of audio filter circuit Download PDFInfo
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- CN106849901A CN106849901A CN201611230551.2A CN201611230551A CN106849901A CN 106849901 A CN106849901 A CN 106849901A CN 201611230551 A CN201611230551 A CN 201611230551A CN 106849901 A CN106849901 A CN 106849901A
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- electric capacity
- resistance
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- resistor
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
Abstract
The present invention discloses a kind of audio filter circuit, is used to prevent from causing circuit oscillation by adjusting bandwidth with Wien bridge, and adjusting the first potentiometer；Audio-frequency noise is filtered when small-signal is amplified using the cooperation of multilevel amplifiers again, it is ensured that the validity of filtering and anti-tampering property, so as to reduce noise, improve anti-noise ability, improvement is being communicated or passed on the quality and effect of information with product.
Description
Technical field
The present invention relates to filter field, and in particular to a kind of audio filter circuit.
Background technology
With developing rapidly for science and technology, with the electronic product that audio-frequency information is transmitted, more and more enter ours
Production, life and various social activitieies practice.To the quality requirement of the audio-frequency information for being transmitted, particularly voice messaging
More and more higher；Any error of crucial language in important social activities can cause irredeemable heavy losses；However, using
The randomness of occasion is unforeseen, and incident noise jamming brings worried and inconvenience several to high-quality voice messaging
Cannot overcome；Mobile phone, intercom and computer and all need suppress noise jamming audio transmission product, compel to be essential
The anti-noise ability into Transmission system is improved from the source of audio signal sample, is led to these products with improving
News, the quality and effect of passing on information.
The content of the invention
The purpose of the present invention is the audio filter circuit that a kind of noise to audio is filtered.
The present invention is achieved through the following technical solutions：A kind of audio filter circuit,：Including input port, output port,
One resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th electricity
Resistance, the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th resistance, the 15th resistance, the 16th electricity
Resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity,
Nine electric capacity, the tenth electric capacity, the 11st electric capacity, the 12nd electric capacity, the 13rd electric capacity, the 14th electric capacity, the 15th electric capacity, the 16th
Electric capacity, the 17th electric capacity, the 18th electric capacity, the 19th electric capacity, the 20th electric capacity, the 21st electric capacity, the 22nd electric capacity,
23 electric capacity, the 24th electric capacity, the 25th electric capacity, the first potentiometer, the first FET, the first amplifier, the second fortune
Put, the 3rd amplifier；The input port connects one end of the first electric capacity, the other end connection first resistor of first electric capacity
One end, the other end of the first resistor connects the negative input end of the first amplifier, the negative input end and first of first amplifier
Be in series with second resistance between the output end of amplifier, the second resistance is parallel with the second electric capacity, first amplifier it is just defeated
Enter one end that end is connected with 3rd resistor, the other end of the 3rd resistor connects the output end of the first amplifier, the 3rd electricity
One end of resistance is also associated with the 4th resistance, and the other end of the 4th resistance is connected with one end of the first potentiometer, described first
The other end of potentiometer and variable resistance end are connected with each other and are grounded；The output end of first amplifier connects the one of the 3rd electric capacity
End, the other end of the 3rd electric capacity connects one end of the 7th resistance, and one end of the 7th resistance is also connected with the first field-effect
The grid of pipe, the other end of the 7th resistance connects one end of the 6th resistance, the source electrode connection of first FET the
One end of four electric capacity, one end of the 4th electric capacity is also connected with one end of the 8th resistance, the 6th resistance, the 4th electric capacity and
The other end of eight resistance is all grounded；One end of 6th resistance is also connected with one end of the 5th resistance, the 5th resistance it is another
One end connects one end of the 9th resistance, and one end of the 9th resistance is also connected with VCC power supplys, and the other end of the 9th resistance connects
The drain electrode of the first FET is connect, the drain electrode of first FET is additionally coupled to one end of the 5th electric capacity, the 5th electricity
The other end of appearance connects one end of the 6th electric capacity, and the other end of the 6th electric capacity is grounded, and one end of the 6th electric capacity also connects
One end of the 7th electric capacity is connect, the other end of the 7th electric capacity connects one end of the tenth resistance, and one end of the tenth resistance is also
One end of the 9th electric capacity is connected, the other end of the 9th electric capacity connects one end of the 12nd resistance, the 12nd resistance
One end is also connected with one end of the tenth electric capacity, and one end of the tenth electric capacity is also connected with one end of the 11st electric capacity, the described 11st
One end of electric capacity is additionally coupled to the negative input end of the second amplifier, and the positive input terminal of second amplifier is also connected with the 12nd electric capacity
One end, the other end of the tenth resistance, the 12nd resistance, the tenth electric capacity, the 11st electric capacity and the 12nd electric capacity is all grounded；Institute
The other end for stating the 7th electric capacity is also connected with one end of the 8th electric capacity, and the other end of the 8th electric capacity connects the one of the 11st resistance
End, the other end of the 11st resistance connects one end of the 12nd resistance, and one end of the 11st resistance is additionally coupled to the
The output end of two amplifiers, the output end of second amplifier is also connected with one end of the 15th electric capacity, the 15th electric capacity it is another
One end connects one end of the 13rd resistance, and the other end of the 13rd resistance connects one end of the 16th electric capacity, the described tenth
The other end ground connection of six electric capacity；The other end of the 13rd resistance is also connected with one end of the 16th resistance, the 16th electricity
The other end of resistance connects one end of the 14th resistance, and one end of the 14th resistance is also connected with one end of the 18th electric capacity, institute
The one end for stating the 18th electric capacity is also connected with one end of the 19th electric capacity, and one end of the 19th electric capacity is additionally coupled to the 3rd amplifier
Negative input end, the other end of the 14th resistance, the 18th electric capacity and the 19th electric capacity is all grounded, the 3rd amplifier
Positive input terminal connect the 20th electric capacity one end, the 20th electric capacity the other end ground connection, the 13rd resistance it is another
End is also connected with one end of the 15th resistance, and the other end of the 15th resistance connects one end of the 17th electric capacity, the described tenth
The other end of seven electric capacity connects one end of the 14th resistance, and one end of the 17th electric capacity is additionally coupled to the output of the 3rd amplifier
End, the output end of the 3rd amplifier is additionally coupled to one end of the 23rd electric capacity, and the other end of the 23rd electric capacity connects
One end of the 24th electric capacity is connect, one end of the 24th electric capacity is additionally coupled to one end of the 25th electric capacity, described
The other end of 24 electric capacity and the 25th electric capacity is all grounded, and one end of the 25th electric capacity is also connected with output port；
The positive supply terminals connection V+ power supplys of first amplifier, the negative supply terminals connection V- power supplys of first amplifier；Institute
State the positive supply terminals connection V+ power supplys of the second amplifier, the negative supply terminals connection V- power supplys of second amplifier；It is described
The negative supply terminals of the 3rd amplifier connect one end of the 21st electric capacity, the other end ground connection of the 21st electric capacity, institute
The one end for stating the 21st electric capacity is also connected with V- power supplys；The positive supply terminals of the 3rd amplifier connect the 22nd electric capacity
One end, the other end ground connection of the 22nd electric capacity, one end of the 22nd electric capacity is also connected with V+ power supplys.
The present invention is used to prevent from causing circuit to shake by adjusting bandwidth with Wien bridge, and adjusting the first potentiometer
Swing；Again using multilevel amplifiers cooperation amplify small-signal when audio-frequency noise is filtered, it is ensured that the validity of filtering and
Anti-tampering property, so as to reduce noise, improves anti-noise ability, and improvement is being communicated or passed on the quality and effect of information with product
Really.
The present invention is advantageous in that：1）So that the effect of filtering reaches requirement, the generation of interference is prevented；2）Adjustment the
One potentiometer is used to prevent from causing circuit oscillation；3）Signal to noise ratio is improved, noise is reduced, anti-noise ability is improved.
Brief description of the drawings
Fig. 1 is circuit theory diagrams of the invention.
Specific embodiment
Below in conjunction with the accompanying drawings with specific embodiment, the invention will be further described.
See Fig. 1, a kind of audio filter circuit,：Including input port Vin, output port Vout, first resistor R1, second
Resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th
Resistance R9, the tenth resistance R10, the 11st resistance R11, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14,
15 resistance R15, the 16th resistance R16, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electricity
Hold C5, the 6th electric capacity C6, the 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9, the tenth electric capacity C10, the 11st electric capacity C11, the
12 electric capacity C12, the 13rd electric capacity C13, the 14th electric capacity C14, the 15th electric capacity C15, the 16th electric capacity C16, the 17th electricity
Hold C17, the 18th electric capacity C18, the 19th electric capacity C19, the 20th electric capacity C20, the 21st electric capacity C21, the 22nd electric capacity
C22, the 23rd electric capacity C23, the 24th electric capacity C24, the 25th electric capacity C25, the first potentiometer RW1, the first field-effect
Pipe Q1, the first amplifier U1, the second amplifier U2, the 3rd amplifier U3；The input port Vin connects one end of the first electric capacity C1, institute
One end of the other end connection first resistor R1 of the first electric capacity C1 is stated, the other end of the first resistor R1 connects the first amplifier U1
Negative input end, be in series with second resistance R2 between the negative input end of the first amplifier U1 and the output end of the first amplifier U1,
The second resistance R2 is parallel with the second electric capacity C2, and the positive input terminal of the first amplifier U1 is connected with the one of 3rd resistor R3
End, the other end of the 3rd resistor R3 connects the output end of the first amplifier U1, and one end of the 3rd resistor R3 is also associated with
The other end of the 4th resistance R4, the 4th resistance R4 is connected with one end of the first potentiometer RW1, the first potentiometer RW1
The other end and variable resistance end be connected with each other and be grounded；The output end of the first amplifier U1 connects one end of the 3rd electric capacity C3,
The other end of the 3rd electric capacity C3 connects one end of the 7th resistance R7, and one end of the 7th resistance R7 is also connected with first effect
Should pipe Q1 grid, the other end of the 7th resistance R7 connects one end of the 6th resistance R6, the first FET Q1's
Source electrode connects one end of the 4th electric capacity C4, and one end of the 4th electric capacity C4 is also connected with one end of the 8th resistance R8, the described 6th
Resistance R6, the other end of the 4th electric capacity C4 and the 8th resistance R8 are all grounded；One end of the 6th resistance R6 is also connected with the 5th electricity
One end of R5 is hindered, the other end of the 5th resistance R5 connects one end of the 9th resistance R9, and one end of the 9th resistance R9 is also
Connection VCC power supplys, the other end of the 9th resistance R9 connects the drain electrode of the first FET Q1, the first FET Q1
Drain electrode be additionally coupled to one end of the 5th electric capacity C5, the other end of the 5th electric capacity C5 connects one end of the 6th electric capacity C6, institute
The other end ground connection of the 6th electric capacity C6 is stated, one end of the 6th electric capacity C6 is also connected with one end of the 7th electric capacity C7, the described 7th
The other end of electric capacity C7 connects one end of the tenth resistance R10, and one end of the tenth resistance R10 is also connected with the one of the 9th electric capacity C9
End, the other end of the 9th electric capacity C9 connects one end of the 12nd resistance R12, and one end of the 12nd resistance R12 also connects
One end of the tenth electric capacity C10 is connect, one end of the tenth electric capacity C10 is also connected with one end of the 11st electric capacity C11, the described 11st
One end of electric capacity C11 is additionally coupled to the negative input end of the second amplifier U2, and the positive input terminal of the second amplifier U2 is also connected with the tenth
One end of two electric capacity C12, the tenth resistance R10, the 12nd resistance R12, the tenth electric capacity C10, the 11st electric capacity C11 and the tenth
The other end of two electric capacity C12 is all grounded；The other end of the 7th electric capacity C7 is also connected with one end of the 8th electric capacity C8, the described 8th
The other end of electric capacity C8 connects one end of the 11st resistance R11, and the other end of the 11st resistance R11 connects the 12nd resistance
One end of R12, one end of the 11st resistance R11 is additionally coupled to the output end of the second amplifier U2, the second amplifier U2's
Output end is also connected with one end of the 15th electric capacity C15, and the other end of the 15th electric capacity C15 connects the 13rd resistance R13's
One end, the other end of the 13rd resistance R13 connects one end of the 16th electric capacity C16, and the 16th electric capacity C16's is another
End ground connection；The other end of the 13rd resistance R13 is also connected with one end of the 16th resistance R16, the 16th resistance R16's
The other end connects one end of the 14th resistance R14, and one end of the 14th resistance R14 is also connected with the one of the 18th electric capacity C18
End, one end of the 18th electric capacity C18 is also connected with one end of the 19th electric capacity C19, and one end of the 19th electric capacity C19 is also
Be connected to the negative input end of the 3rd amplifier U3, the 14th resistance R14, the 18th electric capacity C18 and the 19th electric capacity C19 it is another
One end is all grounded, and the positive input terminal of the 3rd amplifier U3 connects one end of the 20th electric capacity C20, the 20th electric capacity C20
Other end ground connection, the other end of the 13rd resistance R13 is also connected with one end of the 15th resistance R15, the 15th electricity
The other end for hindering R15 connects one end of the 17th electric capacity C17, and the other end of the 17th electric capacity C17 connects the 14th resistance
One end of R14, one end of the 17th electric capacity C17 is additionally coupled to the output end of the 3rd amplifier U3, the 3rd amplifier U3's
Output end is additionally coupled to one end of the 23rd electric capacity C23, the electricity of other end connection the 24th of the 23rd electric capacity C23
Hold one end of C24, one end of the 24th electric capacity C24 is additionally coupled to one end of the 25th electric capacity C25, the described 20th
The other end of four electric capacity C24 and the 25th electric capacity C25 is all grounded, and one end of the 25th electric capacity C25 is also connected with output
Port Vout；The positive supply terminals connection V+ power supplys of the first amplifier U1, the negative supply terminals of the first amplifier U1
Connection V- power supplys；The positive supply terminals connection V+ power supplys of the second amplifier U2, the negative supply wiring of the second amplifier U2
End connection V- power supplys；The negative supply terminals of the 3rd amplifier U3 connect one end of the 21st electric capacity C21, the described 20th
The other end ground connection of one electric capacity C21, one end of the 21st electric capacity C21 is also connected with V- power supplys；The 3rd amplifier U3's
Positive supply terminals connect one end of the 22nd electric capacity C22, the other end ground connection of the 22nd electric capacity C22, described the
One end of 22 electric capacity C22 is also connected with V+ power supplys.
In present embodiment, signal passes through Wien bridge after filtering first, and the effect with BREATHABLE BANDWIDTH, and adjusts
Whole first potentiometer is used to prevent from causing circuit oscillation, and the filter circuit for then being constituted by multilevel amplifiers leaches nothing in signal
Frequency content, so as to realize leaching frequency noise in signal, can just reduce noise, improve anti-noise ability, improve fortune
The quality and effect of information are being communicated or are being passed on product.
Protection scope of the present invention includes but is not limited to embodiment of above, and protection scope of the present invention is with claims
Be defined, any replacement being readily apparent that to those skilled in the art that this technology is made, deformation, improvement each fall within it is of the invention
Protection domain.
Claims (3)
1. a kind of audio filter circuit, it is characterised in that：Including input port（Vin）, output port（Vout）, first resistor
（R1）, second resistance（R2）, 3rd resistor（R3）, the 4th resistance（R4）, the 5th resistance（R5）, the 6th resistance（R6）, the 7th electricity
Resistance（R7）, the 8th resistance（R8）, the 9th resistance（R9）, the tenth resistance（R10）, the 11st resistance（R11）, the 12nd resistance
（R12）, the 13rd resistance（R13）, the 14th resistance（R14）, the 15th resistance（R15）, the 16th resistance（R16）, first electricity
Hold（C1）, the second electric capacity（C2）, the 3rd electric capacity（C3）, the 4th electric capacity（C4）, the 5th electric capacity（C5）, the 6th electric capacity（C6）, the 7th
Electric capacity（C7）, the 8th electric capacity（C8）, the 9th electric capacity（C9）, the tenth electric capacity（C10）, the 11st electric capacity（C11）, the 12nd electric capacity
（C12）, the 13rd electric capacity（C13）, the 14th electric capacity（C14）, the 15th electric capacity（C15）, the 16th electric capacity（C16）, the 17th
Electric capacity（C17）, the 18th electric capacity（C18）, the 19th electric capacity（C19）, the 20th electric capacity（C20）, the 21st electric capacity（C21）、
22nd electric capacity（C22）, the 23rd electric capacity（C23）, the 24th electric capacity（C24）, the 25th electric capacity（C25）, first
Potentiometer（RW1）, the first FET（Q1）, the first amplifier（U1）, the second amplifier（U2）, the 3rd amplifier（U3）；The input
Port（Vin）Connect the first electric capacity（C1）One end, first electric capacity（C1）The other end connection first resistor（R1）One
End, the first resistor（R1）The other end connect the first amplifier（U1）Negative input end, first amplifier（U1）It is negative defeated
Enter end and the first amplifier（U1）Output end between be in series with second resistance（R2）, the second resistance（R2）It is parallel with the second electricity
Hold（C2）, first amplifier（U1）Positive input terminal be connected with 3rd resistor（R3）One end, the 3rd resistor（R3）'s
The other end connects the first amplifier（U1）Output end, the 3rd resistor（R3）One end be also associated with the 4th resistance（R4）, institute
State the 4th resistance（R4）The other end be connected with the first potentiometer（RW1）One end, first potentiometer（RW1）The other end
It is connected with each other and is grounded with variable resistance end；First amplifier（U1）Output end connect the 3rd electric capacity（C3）One end, it is described
3rd electric capacity（C3）The other end connect the 7th resistance（R7）One end, the 7th resistance（R7）One end be also connected with first
Effect pipe（Q1）Grid, the 7th resistance（R7）The other end connect the 6th resistance（R6）One end, it is described first effect
Ying Guan（Q1）Source electrode connect the 4th electric capacity（C4）One end, the 4th electric capacity（C4）One end be also connected with the 8th resistance（R8）
One end, the 6th resistance（R6）, the 4th electric capacity（C4）With the 8th resistance（R8）The other end be all grounded；6th resistance
（R6）One end be also connected with the 5th resistance（R5）One end, the 5th resistance（R5）The other end connect the 9th resistance（R9）'s
One end, the 9th resistance（R9）One end be also connected with VCC power supplys, the 9th resistance（R9）The other end connect first effect
Ying Guan（Q1）Drain electrode, first FET（Q1）Drain electrode be additionally coupled to the 5th electric capacity（C5）One end, the described 5th
Electric capacity（C5）The other end connect the 6th electric capacity（C6）One end, the 6th electric capacity（C6）The other end ground connection, the described 6th
Electric capacity（C6）One end be also connected with the 7th electric capacity（C7）One end, the 7th electric capacity（C7）The other end connect the tenth resistance
（R10）One end, the tenth resistance（R10）One end be also connected with the 9th electric capacity（C9）One end, the 9th electric capacity（C9）
The other end connect the 12nd resistance（R12）One end, the 12nd resistance（R12）One end be also connected with the tenth electric capacity
（C10）One end, the tenth electric capacity（C10）One end be also connected with the 11st electric capacity（C11）One end, the 11st electric capacity
（C11）One end be additionally coupled to the second amplifier（U2）Negative input end, second amplifier（U2）Positive input terminal be also connected with
12 electric capacity（C12）One end, the tenth resistance（R10）, the 12nd resistance（R12）, the tenth electric capacity（C10）, the 11st electricity
Hold（C11）With the 12nd electric capacity（C12）The other end be all grounded；7th electric capacity（C7）The other end be also connected with the 8th electric capacity
（C8）One end, the 8th electric capacity（C8）The other end connect the 11st resistance（R11）One end, the 11st resistance
（R11）The other end connect the 12nd resistance（R12）One end, the 11st resistance（R11）One end be additionally coupled to second
Amplifier（U2）Output end, second amplifier（U2）Output end be also connected with the 15th electric capacity（C15）One end, the described tenth
Five electric capacity（C15）The other end connect the 13rd resistance（R13）One end, the 13rd resistance（R13）The other end connection
16th electric capacity（C16）One end, the 16th electric capacity（C16）The other end ground connection；13rd resistance（R13）It is another
One end is also connected with the 16th resistance（R16）One end, the 16th resistance（R16）The other end connect the 14th resistance
（R14）One end, the 14th resistance（R14）One end be also connected with the 18th electric capacity（C18）One end, it is described 18th electricity
Hold（C18）One end be also connected with the 19th electric capacity（C19）One end, the 19th electric capacity（C19）One end be additionally coupled to
Three amplifiers（U3）Negative input end, the 14th resistance（R14）, the 18th electric capacity（C18）With the 19th electric capacity（C19）It is another
One end is all grounded, the 3rd amplifier（U3）Positive input terminal connect the 20th electric capacity（C20）One end, the 20th electric capacity
（C20）The other end ground connection, the 13rd resistance（R13）The other end be also connected with the 15th resistance（R15）One end, it is described
15th resistance（R15）The other end connect the 17th electric capacity（C17）One end, the 17th electric capacity（C17）The other end
Connect the 14th resistance（R14）One end, the 17th electric capacity（C17）One end be additionally coupled to the 3rd amplifier（U3）Output
End, the 3rd amplifier（U3）Output end be additionally coupled to the 23rd electric capacity（C23）One end, the 23rd electric capacity
（C23）The other end connect the 24th electric capacity（C24）One end, the 24th electric capacity（C24）One end be additionally coupled to
25th electric capacity（C25）One end, the 24th electric capacity（C24）With the 25th electric capacity（C25）The other end all connect
Ground, the 25th electric capacity（C25）One end be also connected with output port（Vout）.
2. a kind of audio filter circuit according to claim 1, it is characterised in that：First amplifier（U1）Positive supply
Terminals connect V+ power supplys, first amplifier（U1）Negative supply terminals connection V- power supplys；Second amplifier（U2）'s
Positive supply terminals connect V+ power supplys, second amplifier（U2）Negative supply terminals connection V- power supplys.
3. a kind of audio filter circuit according to claim 1, it is characterised in that：3rd amplifier（U3）Negative supply
Terminals connect the 21st electric capacity（C21）One end, the 21st electric capacity（C21）The other end ground connection, described second
11 electric capacity（C21）One end be also connected with V- power supplys；3rd amplifier（U3）Positive supply terminals connection the 22nd electricity
Hold（C22）One end, the 22nd electric capacity（C22）The other end ground connection, the 22nd electric capacity（C22）One end also
Connection V+ power supplys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611230551.2A CN106849901A (en) | 2016-12-28 | 2016-12-28 | A kind of audio filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611230551.2A CN106849901A (en) | 2016-12-28 | 2016-12-28 | A kind of audio filter circuit |
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| CN106849901A true CN106849901A (en) | 2017-06-13 |
Family
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| CN201611230551.2A Pending CN106849901A (en) | 2016-12-28 | 2016-12-28 | A kind of audio filter circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110189559A (en) * | 2019-07-04 | 2019-08-30 | 山东中医药高等专科学校 | A kind of intelligence pronunciation of English tutoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110189559A (en) * | 2019-07-04 | 2019-08-30 | 山东中医药高等专科学校 | A kind of intelligence pronunciation of English tutoring system |
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