CN110706527A - Intelligent English teaching system - Google Patents
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- 238000012545 processing Methods 0.000 claims abstract description 142
- 238000000605 extraction Methods 0.000 claims abstract description 23
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- 239000003990 capacitor Substances 0.000 claims description 25
- 238000005282 brightening Methods 0.000 claims description 21
- 230000003321 amplification Effects 0.000 claims description 18
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 18
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/06—Electrically-operated educational appliances with both visual and audible presentation of the material to be studied
- G09B5/065—Combinations of audio and video presentations, e.g. videotapes, videodiscs, television systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/10—Services
- G06Q50/20—Education
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- G06T5/73—
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/50—Context or environment of the image
- G06V20/52—Surveillance or monitoring of activities, e.g. for recognising suspicious objects
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10016—Video; Image sequence
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20024—Filtering details
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/30—Subject of image; Context of image processing
- G06T2207/30232—Surveillance
Abstract
The invention provides an intelligent English teaching system which comprises a sound sensor, a signal processing circuit, an input control device, an image acquisition module, an image processing module, a central processing device, a standard pronunciation database, a characteristic quantity extraction module, a display, a trigger module, a display device, a comparison module and a storage device.
Description
Technical Field
The invention relates to the field of teaching, in particular to an intelligent English teaching system.
Background
English is the official language used in most countries in the world, the firm English foundation has positive effects on cultural communication and academic research, and China always pays great attention to the teaching of English. The main role of language lies in interpersonal communication, and with more and more frequent international communication, the needs of all social industries for talents with good spoken English expression capacity are gradually strengthened. However, the oral teaching effect in China is not ideal, and the situation of 'dumb English' is not rare in every school.
The internet of things technology is a connection network of everything constructed by technologies such as computers, wireless data and the like. In this vast network, the items can communicate with each other in real time without human assistance. The operation principle is that the radio frequency automatic identification technology is utilized, and the identification and sharing of the article information are realized with the help of the computer Internet of things. Compared with the Internet, the Internet of things can be more directly connected with various sensors under the condition of being separated from manual input of people, and the functions of automatic acquisition and automatic processing are realized.
In recent years, in a classroom in which the internet of things technology is continuously deepened into English teaching, a video sensor and a voice sensor are introduced through the internet of things, the actual pronunciation mode of a student is compared with the standard pronunciation mode, and the mouth shape error and the pronunciation error of the student in English learning are corrected in time. The video sensor in the technology of the Internet of things is used for intercepting the mouth shape of a student and providing the mouth shape to a computer for analysis, and the voice sensor is used for recording the pronunciation of the student and providing the pronunciation to the computer for analysis.
Among the prior art, there are two problems at present in the english teaching, one is how to ensure the student and listen to class efficiency during theoretical teaching, and the other is how to correct student's wrong pronunciation when the spoken language teaching, often monitors through image acquisition's mode when monitoring student's state of attending to class, however, the definition of the image of gathering is not high, and use speech sensor to lack succinctly when monitoring student's pronunciation, whether convenient and efficient compare the mode in order to discern student's pronunciation accurate.
Disclosure of Invention
Therefore, in order to overcome the above problems, the present invention provides an intelligent english teaching system, which includes a sound sensor, a signal processing circuit, an input control device, an image acquisition module, an image processing module, a central processing unit, a standard pronunciation database, a feature extraction module, a display, a trigger module, a display device, a comparison module and a storage device, wherein the image acquisition module acquires image information of a student in class, the image processing module is used to perform sharpening processing on the acquired image, the sound sensor acquires a pronunciation signal of the student, the signal processing circuit is used to amplify and filter the pronunciation signal, and the feature quantity of the processed pronunciation signal is compared with the feature quantity of the standard pronunciation to determine the pronunciation accuracy of the student.
The invention provides an intelligent English teaching system which comprises a sound sensor, a signal processing circuit, an input control device, an image acquisition module, an image processing module, a central processing unit, a standard pronunciation database, a characteristic quantity extraction module, a display, a trigger module, a display device, a comparison module and a storage device.
Wherein, the output end of the sound sensor is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the central processing device, the output end of the input control device is connected with the input end of the central processing device, the output end of the image acquisition module is connected with the input end of the image processing module, the output end of the image processing module is connected with the input end of the central processing device, the output end of the central processing device is connected with the input end of the characteristic quantity extraction module, the output end of the central processing device is connected with the input end of the standard pronunciation database, the output end of the central processing device is connected with the input end of the display, the output end of the central processing device is connected with the input end of the trigger module, the output end of the trigger module is connected with the input end of, the output end of the standard pronunciation database is also connected with the input end of the comparison module, the output end of the comparison module is connected with the input end of the display device, and the output end of the comparison module is also connected with the input end of the storage device.
Wherein, the image acquisition module is arranged in a classroom and used for acquiring image information of students in the classroom, the image acquisition module transmits the acquired image information to the image processing module, the image processing module performs image processing on the received image, the image processing module transmits the image information after image processing to the central processing device, the central processing device transmits the received image information to the display for display, the display is positioned at the position of a classroom platform, a teacher observes the listening state of the students in the classroom according to the image information received by the display, the input control equipment is arranged at the position of the classroom platform, the teacher selects English word numbers to be read by the students through the input control equipment, the input control equipment transmits the numbers to the central processing device, the central processing device extracts the characteristic quantity of standard pronunciations of the English words corresponding to the numbers in the standard pronunciation database to the comparison module according to the received numbers, the teacher selects the serial number of the sound sensor needing to be gated through the input control device, the input control device transmits the serial number to the central processing device, the central processing device controls the trigger module to send a trigger signal according to the received serial number so as to gate the sound sensor corresponding to the serial number, the sound sensor is arranged on a seat of each student in the classroom and is used for collecting pronunciation signals of the students when the students read English, the sound sensor transmits the collected pronunciation signals to the signal processing circuit, the signal processing circuit performs signal processing on the received pronunciation signals, the signal processing circuit transmits the processed pronunciation signals to the central processing device, the central processing device transmits the received pronunciation signals to the characteristic quantity extraction module, the characteristic quantity extraction module extracts characteristic parameters of the received pronunciation signals, and the characteristic quantity extraction module transmits the extracted characteristic parameters to the comparison module, the comparison module compares the received characteristic parameters with the received characteristic quantities of the standard pronunciation, the comparison module transmits the comparison result to the display device for display, and the comparison module transmits the comparison result to the storage device for storage.
Preferably, the feature quantity extraction module extracts feature parameters of the received pronunciation signal, and the feature parameters are frequency parameters or amplitude parameters of the pronunciation signal.
Preferably, the image processing module includes an image enhancement unit, an image brightening unit, and an image filtering unit.
The output end of the image acquisition module is connected with the input end of the image enhancement unit, the output end of the image enhancement unit is connected with the input end of the image brightening unit, the output end of the image brightening unit is connected with the input end of the image filtering unit, and the output end of the image filtering unit is connected with the input end of the central processing unit.
Preferably, the image transmitted from the image acquisition module to the image enhancement unit is defined as a two-dimensional function f (x, y), where x and y are spatial coordinates, and the two-dimensional function of the image processed by the image enhancement module is g (x, y), and then,
。
preferably, the image g (x, y) is transmitted to an image brightening unit, the image brightening unit brightens the image g (x, y), and the two-dimensional function of the image after the brightening is h (x, y), wherein the brightness range of the image g (x, y) is [ a, b ], the brightness range of the image h (x, y) after the adjustment by the image brightening unit is [ c, d ], and the unit of a, b, c, d is nits, and then,
preferably, the image h (x, y) is transmitted to an image filtering unit, the image filtering unit filters the image h (x, y), and the two-dimensional function of the filtered image is k (x, y), wherein
In order to adjust the parameters of the device,
the image filtering module transmits the image k (x, y) to the central processing device.
Preferably, the sound sensor sets up in every student's in the classroom seat, the sound sensor is used for gathering the pronunciation signal of student when reading the english, pronunciation signal conversion who will gather is voltage signal V0, and transmit voltage signal V0 to signal processing circuit, V1 is the voltage signal after signal processing circuit handles, signal processing circuit includes signal amplification unit and signal filtering unit, the output of sound sensor is connected with signal amplification unit's input, signal amplification unit's output is connected with signal filtering unit's input, signal filtering unit's output is connected with central processing unit's input.
Preferably, the signal amplifying unit includes operational amplifiers a1-a2 and resistors R1-R7.
Wherein, the output end of the sound sensor is connected with one end of a resistor R1, one end of a resistor R1 is further connected with one end of a resistor R3, the other end of a resistor R1 is connected with the output end of an operational amplifier A1, the other end of a resistor R1 is further connected with one end of a resistor R2, the other end of a resistor R2 is connected with the inverting input end of an operational amplifier A1, the other end of a resistor R3 is connected with the inverting input end of an operational amplifier A2, the other end of a resistor R3 is connected with one end of a resistor R7, one end of a resistor R4 is grounded, the other end of a resistor R4 is connected with the non-inverting input end of an operational amplifier A2, one end of a resistor R5 is connected with the other end of a resistor R2, the other end of a resistor R5 is further connected with the inverting input end of an operational amplifier A1, one end of a resistor R6 is connected with the non-inverting input end of an operational amplifier A86, the output of the operational amplifier a2 is connected to the input of the signal filtering unit.
Preferably, the signal filtering unit includes resistors R8-R14, capacitors C1-C2, and operational amplifiers A3-A4.
Wherein, the output end of the signal amplifying unit is connected with one end of a capacitor C1, one end of a capacitor C1 is further connected with one end of a resistor R8, the other end of a resistor R8 is connected with the other end of a capacitor C1, one end of a resistor R9 is grounded, the other end of a resistor R9 is connected with the other end of a resistor R8, the other end of a capacitor C1 is connected with the non-inverting input end of an operational amplifier A3, one end of a resistor R10 is connected with one end of a capacitor C2, the other end of a resistor R10 is connected with the non-inverting input end of an operational amplifier A3, one end of a resistor R10 is further connected with the output end of an operational amplifier A4, the other end of a capacitor C2 is connected with the inverting input end of an operational amplifier A3, one end of a sliding rheostat R11 is connected with the inverting input end of an operational amplifier A3, one end of a sliding resistor R11 is further connected with the inverting input, one end of a resistor R12 is connected with the other end of the sliding rheostat R11, the other end of the resistor R12 is connected with the output end of an operational amplifier A3, one end of a resistor R14 is connected with one end of a resistor R8, the other end of the resistor R14 is connected with the non-inverting input end of an operational amplifier A4, the other end of a resistor R14 is further connected with one end of a resistor R13, the other end of a resistor R13 is connected with the other end of a resistor R12, the other end of the resistor R13 is further connected with the output end of an operational amplifier A3, the output end of an operational amplifier A3 is connected with the input end of the central processing device, and the signal filtering unit transmits a voltage signal V89.
Preferably, the intelligent English teaching system further comprises a wireless transmission device, and the comparison module transmits the comparison result to the mobile phone of the teacher through the wireless transmission device.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention provides an intelligent English teaching system which comprises a sound sensor, a signal processing circuit, an input control device, an image acquisition module, an image processing module, a central processing unit, a standard pronunciation database, a characteristic quantity extraction module, a display, a trigger module, a display device, a comparison module and a storage device.
(2) Because the signal collected by the sound sensor is a weak voltage signal, the signal amplification unit amplifies the voltage V0 output by the sound sensor through the operational amplifier A1-A2 and the resistor R1-R7, and the signal amplification unit consisting of the operational amplifier A1-A2 and the resistor R1-R7 only has drift of 1.25 muV/DEG C, offset within 2 muV, 100pA bias current and noise within 2.75nV within a 0.1Hz to 10Hz broadband. The signal filtering unit uses resistors R8-R14, capacitors C1-C2 and an operational amplifier A3-A4 to filter the amplified electric signals, so that the accuracy of sound detection is improved.
Drawings
FIG. 1 is a schematic diagram of an intelligent English teaching system of the present invention;
FIG. 2 is a diagram of an image processing module according to the present invention;
FIG. 3 is a circuit diagram of a signal processing circuit according to the present invention;
fig. 4 is a waveform diagram of the pronunciation signal processed by the signal processing circuit.
Detailed Description
Reference now will be made in detail to embodiments of the invention, one or more examples of which are illustrated in the drawings. Various examples are provided by way of discussion of the invention and are not limitations of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope and spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. The term "about" used in connection with a numerical value means within 25% of the stated amount.
The intelligent english teaching system of the present invention is described in detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the intelligent english teaching system provided by the present invention includes a sound sensor, a signal processing circuit, an input control device, an image acquisition module, an image processing module, a central processing unit, a standard pronunciation database, a feature extraction module, a display, a trigger module, a display device, a comparison module, and a storage device.
Wherein, the output end of the sound sensor is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the central processing device, the output end of the input control device is connected with the input end of the central processing device, the output end of the image acquisition module is connected with the input end of the image processing module, the output end of the image processing module is connected with the input end of the central processing device, the output end of the central processing device is connected with the input end of the characteristic quantity extraction module, the output end of the central processing device is connected with the input end of the standard pronunciation database, the output end of the central processing device is connected with the input end of the display, the output end of the central processing device is connected with the input end of the trigger module, the output end of the trigger module is connected with the input end of, the output end of the standard pronunciation database is also connected with the input end of the comparison module, the output end of the comparison module is connected with the input end of the display device, and the output end of the comparison module is also connected with the input end of the storage device.
Wherein, the image acquisition module is arranged in a classroom and used for acquiring image information of students in the classroom, the image acquisition module transmits the acquired image information to the image processing module, the image processing module performs image processing on the received image, the image processing module transmits the image information after image processing to the central processing device, the central processing device transmits the received image information to the display for display, the display is positioned at the position of a classroom platform, a teacher observes the listening state of the students in the classroom according to the image information received by the display, the input control equipment is arranged at the position of the classroom platform, the teacher selects English word numbers to be read by the students through the input control equipment, the input control equipment transmits the numbers to the central processing device, the central processing device extracts the characteristic quantity of standard pronunciations of the English words corresponding to the numbers in the standard pronunciation database to the comparison module according to the received numbers, the teacher selects the serial number of the sound sensor needing to be gated through the input control device, the input control device transmits the serial number to the central processing device, the central processing device controls the trigger module to send a trigger signal according to the received serial number so as to gate the sound sensor corresponding to the serial number, the sound sensor is arranged on a seat of each student in the classroom and is used for collecting pronunciation signals of the students when the students read English, the sound sensor transmits the collected pronunciation signals to the signal processing circuit, the signal processing circuit performs signal processing on the received pronunciation signals, the signal processing circuit transmits the processed pronunciation signals to the central processing device, the central processing device transmits the received pronunciation signals to the characteristic quantity extraction module, the characteristic quantity extraction module extracts characteristic parameters of the received pronunciation signals, and the characteristic quantity extraction module transmits the extracted characteristic parameters to the comparison module, the comparison module compares the received characteristic parameters with the received characteristic quantities of the standard pronunciation, the comparison module transmits the comparison result to the display device for display, and the comparison module transmits the comparison result to the storage device for storage.
In the above embodiment, intelligence english teaching system includes the sound sensor, signal processing circuit, input control device, image acquisition module, image processing module, central processing unit, standard pronunciation database, the characteristic vector draws the module, a display, trigger module, a display device, comparison module and storage device, image information when gathering the student through image acquisition module and going up class, use image processing module to carry out the sharpening to the image of gathering, gather student's pronunciation signal through the sound sensor, use signal processing circuit to carry out amplification and filtering processing to pronunciation signal, compare the characteristic vector of pronunciation signal after handling and the characteristic vector of standard pronunciation and judge with student's pronunciation degree of accuracy.
Furthermore, the central processing device extracts the characteristic quantity of the standard pronunciation of the english word corresponding to the serial number in the standard pronunciation database to the comparison module according to the received serial number, and the characteristic quantity extraction module extracts the characteristic parameter of the received pronunciation signal, wherein the characteristic quantity of the standard pronunciation and the characteristic parameter of the pronunciation signal are the same characteristic parameter, such as both a frequency parameter or an amplitude parameter.
Furthermore, the comparison module compares the received feature parameter with the feature quantity of the received standard pronunciation, and if the absolute error of the received feature parameter from the feature quantity of the received standard pronunciation is greater than 5%, the comparison module determines that the student pronunciation is not standard, of course, the threshold of 5% is set manually by a person skilled in the art, and can be set to other values, such as 10%, according to specific situations.
Specifically, the feature quantity extraction module extracts a feature parameter of the received pronunciation signal, wherein the feature parameter is a frequency parameter or an amplitude parameter of the pronunciation signal.
As shown in fig. 2, the image processing module includes an image enhancement unit, an image brightening unit, and an image filtering unit.
The output end of the image acquisition module is connected with the input end of the image enhancement unit, the output end of the image enhancement unit is connected with the input end of the image brightening unit, the output end of the image brightening unit is connected with the input end of the image filtering unit, and the output end of the image filtering unit is connected with the input end of the central processing unit.
Specifically, the image transmitted from the image acquisition module to the image enhancement unit is defined as a two-dimensional function f (x, y), where x and y are spatial coordinates, and the two-dimensional function of the image processed by the image enhancement module is g (x, y), if any,
。
specifically, the image g (x, y) is transmitted to an image brightening unit, the image brightening unit brightens the image g (x, y), and the two-dimensional function of the image after the brightening is h (x, y), wherein the brightness range of the image g (x, y) is [ a, b ], the brightness range of the image h (x, y) after the adjustment by the image brightening unit is [ c, d ], and the unit of a, b, c, d is nits, and then,
specifically, the image h (x, y) is transmitted to an image filtering unit, which filters the image h (x, y) throughThe two-dimensional function of the filtered image is k (x, y), whereinIn order to adjust the parameters of the device,
in the above embodiment, two neighborhoods near the image h (x, y) collected by the image brightening unit are denoised, and since noise signals of the neighborhoods are almost consistent, a better denoising effect can be obtained by adopting a neighborhood denoising method.
The image filtering module transmits the image k (x, y) to the central processing device.
As shown in fig. 3, the sound sensor is disposed on the seat of each student in the classroom, the sound sensor is used for collecting the pronunciation signal of the student when reading english, convert the collected pronunciation signal into a voltage signal V0, and transmit the voltage signal V0 to the signal processing circuit, V1 is the voltage signal processed by the signal processing circuit, the signal processing circuit includes a signal amplification unit and a signal filtering unit, the output end of the sound sensor is connected with the input end of the signal amplification unit, the output end of the signal amplification unit is connected with the input end of the signal filtering unit, and the output end of the signal filtering unit is connected with the input end of the central processing unit.
Specifically, the signal amplification unit includes operational amplifiers A1-A2 and resistors R1-R7.
Wherein, the output end of the sound sensor is connected with one end of a resistor R1, one end of a resistor R1 is further connected with one end of a resistor R3, the other end of a resistor R1 is connected with the output end of an operational amplifier A1, the other end of a resistor R1 is further connected with one end of a resistor R2, the other end of a resistor R2 is connected with the inverting input end of an operational amplifier A1, the other end of a resistor R3 is connected with the inverting input end of an operational amplifier A2, the other end of a resistor R3 is connected with one end of a resistor R7, one end of a resistor R4 is grounded, the other end of a resistor R4 is connected with the non-inverting input end of an operational amplifier A2, one end of a resistor R5 is connected with the other end of a resistor R2, the other end of a resistor R5 is further connected with the inverting input end of an operational amplifier A1, one end of a resistor R6 is connected with the non-inverting input end of an operational amplifier A86, the output of the operational amplifier a2 is connected to the input of the signal filtering unit.
Specifically, the signal filtering unit comprises resistors R8-R14, capacitors C1-C2 and operational amplifiers A3-A4.
Wherein, the output end of the signal amplifying unit is connected with one end of a capacitor C1, one end of a capacitor C1 is further connected with one end of a resistor R8, the other end of a resistor R8 is connected with the other end of a capacitor C1, one end of a resistor R9 is grounded, the other end of a resistor R9 is connected with the other end of a resistor R8, the other end of a capacitor C1 is connected with the non-inverting input end of an operational amplifier A3, one end of a resistor R10 is connected with one end of a capacitor C2, the other end of a resistor R10 is connected with the non-inverting input end of an operational amplifier A3, one end of a resistor R10 is further connected with the output end of an operational amplifier A4, the other end of a capacitor C2 is connected with the inverting input end of an operational amplifier A3, one end of a sliding rheostat R11 is connected with the inverting input end of an operational amplifier A3, one end of a sliding resistor R11 is further connected with the inverting input, one end of a resistor R12 is connected with the other end of the sliding rheostat R11, the other end of the resistor R12 is connected with the output end of an operational amplifier A3, one end of a resistor R14 is connected with one end of a resistor R8, the other end of the resistor R14 is connected with the non-inverting input end of an operational amplifier A4, the other end of a resistor R14 is further connected with one end of a resistor R13, the other end of a resistor R13 is connected with the other end of a resistor R12, the other end of the resistor R13 is further connected with the output end of an operational amplifier A3, the output end of an operational amplifier A3 is connected with the input end of the central processing device, and the signal filtering unit transmits a voltage signal V89.
In the above embodiment, the noise of the signal processing circuit is within 2.75nV, the drift is 1.25 μ V/DEG C, the models of the operational amplifiers A1-A2 are all LT1012, and the models of the operational amplifiers A3-A4 are LT 1192.
In the signal amplifying unit, the resistance of the resistor R1 is 10k Ω, the resistance of the resistor R2 is 20k Ω, the resistance of the resistor R3 is 10k Ω, the resistance of the resistor R4 is 4.7k Ω, the resistance of the resistor R5 is 20k Ω, the resistance of the resistor R6 is 4.7k Ω, and the resistance of the resistor R7 is 20k Ω.
The signal amplification unit provided by the invention is composed of operational amplifiers A1-A2, wherein a voltage signal acquired by a sensor is V0, and an input current signal of a signal amplification circuit is IiAt this time, the current flowing through the resistor R1 is I, and the current flowing through the resistor R3 is I1The voltage signal output by the operational amplifier a1 is V01, and the voltage signal output by the signal amplification unit is V02.
In the signal amplification unit provided by the invention, the current I of the input loopiMainly provided by the current I of an operational feedback circuit, so that the input circuit obtains a power supply I from a voltage signal acquired by the sensoriThe signal amplification unit can be greatly smaller, the input impedance of the signal amplification unit provided by the invention is extremely high, wherein the operational amplifier A2 is a main amplifier, the operational amplifier A1 provides input current for the operational amplifier A2, and the current obtained by the input circuit to the voltage signal V0 collected by the sensor is extremely small, so the input impedance is greatly improved.
Here, the operational amplifier A1 and the operational amplifier A2 are ideal amplifiers, and the input current I isiComprises the following steps:
furthermore, the method comprises the following steps:
and, instead,
the following can be obtained:
further, the method can be obtained as follows:
。
it can thus be shown that the input current I is given when the resistance R1= R3iAll the signals are provided by the operational amplifier a1, so the input impedance is very large, but in practical use, there is inevitably a certain deviation between R1 and R3, and if the deviation is 0.01%, when R3=10k Ω, the input impedance can be as high as 100M Ω, which cannot be realized/achieved by the amplifying circuit in the prior art.
The open loop gain of the signal amplification unit provided by the invention is larger than 160dB, the time drift is smaller than +/-1 muv/24 h, the temperature drift is smaller than +/-1 muv/DEG C, the low-frequency noise (effective value) is smaller than 0.5 muV, and the voltage signal acquired by the sensor can be effectively and accurately amplified.
In the signal filtering unit, the resistance of the resistor R8 is 4.7k Ω, the resistance of the resistor R9 is 94k Ω, the resistance of the resistor R10 is set according to the value of the capacitor C1 (the specific formula is shown below), the resistance of the resistor R11 is 100k Ω, the resistance of the resistor R12 is 10k Ω, the resistance of the resistor R13 is 10k Ω, the resistance of the resistor R14 is 10k Ω, the capacitance of the capacitor C1 is 0.01 μ F, the capacitance of the capacitor C2 is 0.01 μ F, and the filtering effect is achieved by adjusting the sliding rheostat R11.
In the signal filtering unit, the center frequency of filtering does not need to be accurately adjusted, the stable center frequency of filtering can be obtained only by setting the resistance value of the resistor R12 to be consistent with the resistance R13, and meanwhile, the center frequency of filtering can be finely adjusted by setting the sliding rheostat R11, which is a great advantage of the signal filtering unit provided by the invention and is different from the prior art.
Further, setting the resistor R9=20R8 at the time of filtering can better reduce the noise signal in the voltage signal V02.
Referring to fig. 4, fig. 4-a is a pronunciation signal collected by the sound sensor, fig. 4-b is a pronunciation signal processed by the signal processing circuit, and the abscissa is a time coordinate (t/s) and the ordinate is an amplitude coordinate (V).
Specifically, intelligence english teaching system still includes a wireless transmission equipment, and the comparison module transmits the comparison result to the mr cell-phone through wireless transmission equipment transmission on.
This written description uses examples to disclose the disclosure, including the best mode, and also to enable any person skilled in the art to practice the disclosure, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
Claims (10)
1. An intelligent English teaching system is characterized by comprising a sound sensor, a signal processing circuit, input control equipment, an image acquisition module, an image processing module, a central processing unit, a standard pronunciation database, a characteristic quantity extraction module, a display, a trigger module, display equipment, a comparison module and storage equipment;
wherein, the output end of the sound sensor is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the central processing device, the output end of the input control device is connected with the input end of the central processing device, the output end of the image acquisition module is connected with the input end of the image processing module, the output end of the image processing module is connected with the input end of the central processing device, the output end of the central processing device is connected with the input end of the characteristic quantity extraction module, the output end of the central processing device is connected with the input end of the standard pronunciation database, the output end of the central processing device is connected with the input end of the display, the output end of the central processing device is connected with the input end of the trigger module, and the output end of the trigger module is connected with the input end of the sound sensor, the output end of the characteristic quantity extraction module is connected with the input end of the comparison module, the output end of the standard pronunciation database is also connected with the input end of the comparison module, the output end of the comparison module is connected with the input end of the display device, and the output end of the comparison module is also connected with the input end of the storage device;
the image acquisition module is arranged in a classroom and used for acquiring image information of students in the classroom, the image acquisition module transmits the acquired image information to the image processing module, the image processing module performs image processing on the received image, the image processing module transmits the image information subjected to image processing to the central processing device, the central processing device transmits the received image information to the display for display, the display is positioned at a classroom platform position, a teacher observes the listening state of the students in the classroom according to the image information received by the display, the input control equipment is arranged at the classroom platform position, the teacher selects English word numbers required to be read by the students through the input control equipment, and the input control equipment transmits the numbers to the central processing device, the central processing unit extracts the characteristic quantity of the standard pronunciation of the English words corresponding to the serial number in the standard pronunciation database to the comparison module according to the received serial number, a teacher selects the serial number of the sound sensor needing to be gated through the input control equipment, the input control equipment transmits the serial number to the central processing unit, the central processing unit controls the trigger module to send a trigger signal according to the received serial number so as to gate the sound sensor corresponding to the serial number, the sound sensor is arranged on a seat of each student in a classroom, the sound sensor is used for collecting pronunciation signals of the students when reading English, the sound sensor transmits the collected pronunciation signals to the signal processing circuit, the signal processing circuit performs signal processing on the received pronunciation signals, and the signal processing circuit transmits the processed pronunciation signals to the central processing unit, the central processing unit transmits the received pronunciation signal to the characteristic quantity extraction module, the characteristic quantity extraction module extracts the characteristic parameter of the received pronunciation signal, the characteristic quantity extraction module transmits the extracted characteristic parameter to the comparison module, the comparison module compares the received characteristic parameter with the characteristic quantity of the received standard pronunciation, the comparison module transmits the comparison result to the display device for display, and the comparison module transmits the comparison result to the storage device for storage.
2. The intelligent english teaching system of claim 1, wherein the feature extraction module extracts the feature parameters of the pronunciation signal received by it, and the feature parameters are the frequency parameters or the amplitude parameters of the pronunciation signal.
3. The intelligent English teaching system of claim 1, wherein the image processing module comprises an image enhancement unit, an image brightening unit and an image filtering unit;
the output end of the image acquisition module is connected with the input end of the image enhancement unit, the output end of the image enhancement unit is connected with the input end of the image brightening unit, the output end of the image brightening unit is connected with the input end of the image filtering unit, and the output end of the image filtering unit is connected with the input end of the central processing unit.
4. The intelligent English teaching system of claim 3, wherein the image transmitted from the image acquisition module to the image enhancement unit is defined as a two-dimensional function f (x, y), where x and y are spatial coordinates, and the two-dimensional function of the image processed by the image enhancement module is g (x, y), then there is,
5. the intelligent English teaching system of claim 4, wherein the image g (x, y) is transmitted to the image brightening unit, the image brightening unit brightens the image g (x, y) and the two-dimensional function of the brightened image is h (x, y), wherein the brightness range of the image g (x, y) is [ a, b ], the brightness range of the image h (x, y) adjusted by the image brightening unit is [ c, d ], the unit of a, b, c, d is nits, and there are,
6. the intelligent English teaching system of claim 5, wherein the image h (x, y) is transmitted to the image filtering unit, the image filtering unit filters the image h (x, y), and the two-dimensional function of the filtered image is k (x, y), whereinIn order to adjust the parameters of the device,
；
the image filtering module transmits an image k (x, y) to the central processing device.
7. The intelligent English teaching system of claim 1, wherein the sound sensor is disposed on a seat of each student in the classroom, the sound sensor is configured to collect pronunciation signals of the students while reading English, convert the collected pronunciation signals into a voltage signal V0, and transmit the voltage signal V0 to the signal processing circuit, V1 is the voltage signal processed by the signal processing circuit, the signal processing circuit includes a signal amplifying unit and a signal filtering unit, an output end of the sound sensor is connected to an input end of the signal amplifying unit, an output end of the signal amplifying unit is connected to an input end of the signal filtering unit, and an output end of the signal filtering unit is connected to an input end of the central processing unit.
8. The intelligent English teaching system of claim 7, wherein the signal amplification unit comprises operational amplifiers A1-A2 and resistors R1-R7;
wherein, the output end of the sound sensor is connected with one end of a resistor R1, one end of a resistor R1 is further connected with one end of a resistor R3, the other end of a resistor R1 is connected with the output end of an operational amplifier A1, the other end of a resistor R1 is further connected with one end of a resistor R2, the other end of a resistor R2 is connected with the inverting input end of an operational amplifier A1, the other end of a resistor R3 is connected with the inverting input end of an operational amplifier A2, the other end of a resistor R3 is connected with one end of a resistor R7, one end of a resistor R4 is grounded, the other end of a resistor R4 is connected with the non-inverting input end of an operational amplifier A2, one end of a resistor R5 is connected with the other end of a resistor R2, the other end of a resistor R5 is further connected with the inverting input end of an operational amplifier A1, one end of a resistor R6 is connected with the non-inverting input end of an operational amplifier A1, the output terminal of the operational amplifier a2 is connected to the input terminal of the signal filtering unit.
9. The intelligent English teaching system of claim 8, wherein the signal filtering unit comprises resistors R8-R14, capacitors C1-C2 and operational amplifiers A3-A4;
wherein, the output end of the signal amplifying unit is connected with one end of a capacitor C1, one end of a capacitor C1 is further connected with one end of a resistor R8, the other end of a resistor R8 is connected with the other end of a capacitor C1, one end of a resistor R9 is grounded, the other end of a resistor R9 is connected with the other end of a resistor R8, the other end of a capacitor C1 is connected with the non-inverting input end of an operational amplifier A3, one end of a resistor R10 is connected with one end of a capacitor C2, the other end of a resistor R10 is connected with the non-inverting input end of an operational amplifier A3, one end of a resistor R10 is further connected with the output end of an operational amplifier a4, the other end of a capacitor C3 is connected with the inverting input end of an operational amplifier A3, one end of a sliding resistor R11 is further connected with the inverting input end of an operational amplifier a4, one end of a sliding resistor R11 is further connected with the other end of, one end of a resistor R12 is connected with the other end of the sliding rheostat R11, the other end of a resistor R12 is connected with the output end of an operational amplifier A3, one end of a resistor R14 is connected with one end of a resistor R8, the other end of a resistor R14 is connected with the non-inverting input end of an operational amplifier A4, the other end of the resistor R14 is further connected with one end of a resistor R13, the other end of the resistor R13 is connected with the other end of a resistor R12, the other end of the resistor R13 is further connected with the output end of an operational amplifier A3, the output end of the operational amplifier A3 is connected with the input end of the central processing device, and the signal filtering unit transmits a voltage signal V1 to the.
10. The intelligent english teaching system according to any of claims 1-9, characterized in that the intelligent english teaching system further comprises a wireless transmission device, and the comparison module transmits the comparison result to the teacher's mobile phone through the wireless transmission device.
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