CN106992024A - A kind of modernizing teaching intelligent voice system - Google Patents
A kind of modernizing teaching intelligent voice system Download PDFInfo
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- CN106992024A CN106992024A CN201710230467.9A CN201710230467A CN106992024A CN 106992024 A CN106992024 A CN 106992024A CN 201710230467 A CN201710230467 A CN 201710230467A CN 106992024 A CN106992024 A CN 106992024A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/16—Storage of analogue signals in digital stores using an arrangement comprising analogue/digital [A/D] converters, digital memories and digital/analogue [D/A] converters
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10018—Improvement or modification of read or write signals analog processing for digital recording or reproduction
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
- G11B2020/10537—Audio or video recording
- G11B2020/10546—Audio or video recording specifically adapted for audio data
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Abstract
The present invention relates to voice system technical field, and in particular to a kind of modernizing teaching intelligent voice system, including the transmission of over-and under-voltage, delay protection circuit, voice amplification circuit, speech recording and reproducing integrated circuit, voice signal optical fiber and wireless speech input circuit；Wireless speech of the present invention input realizes frequency modulation by changing between the base stage of triode and emitter stage electric capacity, when sound voltage signal is added in the base stage of triode, with sound voltage signal size synchronous change can occur for electric capacity between the base stage and emitter stage of triode, while the frequency of oscillation of triode 9018 is occurred frequency deviation change realizes frequency modulation(PFM).The present invention passes through speech recording and reproducing integrated circuit; the content of teachers can be recorded, and the content of recording can be played out, over-and under-voltage, delay protection circuit can postpone and protection circuit; high rate data transmission is realized in the transmission of voice signal optical fiber, with very strong creativeness.
Description
Technical field
The present invention relates to voice system technical field, and in particular to a kind of modernizing teaching intelligent voice system.
Background technology
Voice, it is for carrying out social friendship to refer to that the mankind are issued by vocal organs, with definite meaning, purpose
The sound on border.Among the shape of language, sound, adopted three base attributes, voice is the first attribute, and the language of the mankind is with language first
The form of sound is formed, and has letterless language, but the not language without voice in the world, and voice plays conclusive branch in language
Support is acted on.Voice is the sound of language, is the carrier of linguistic notation system.It is sent by the vocal organs of people, is loaded certain
Language meaning.Language realizes its social function by voice.Language be the pronunciation and meaning combine notation, the sound of language and
The meaning of language is closely connected, therefore, though language is a kind of sound, but has the area of essence with general sound
Not.Voice is the sound with difference meaning function that human articulation's organ is sent, it is impossible to which voice is regarded as pure natural object
Matter；Voice is the symbolism for most directly recording thinking activities, is the form of sound of language communication instrument.The physical base of voice
Plinth mainly has pitch, loudness of a sound, the duration of a sound, tone color, and this is also four key elements for constituting voice.Pitch, which refers to, to shake frequency of sound wave, i.e. each second
Dynamic number of times number；Loudness of a sound refers to the size of sonic wave amplitude；The duration of a sound refers to the length of acoustic vibration duration, also referred to as " duration "；
Tone color refers to the characteristic and essence of sound, also referred to as " tonequality ".Teaching is a kind of mankind that the religion of teacher and student are constituted
Distinctive personnel training activity.By this activity, teacher is purposeful, planned and organized ground guiding student learns and grasps
Cultural and technical knowledge and technical ability, promote students ' quality to improve, and them is turned into the people required for society.The existing education body of China
System is very huge, and outstanding educational resource is few, the considerable regional quality of education, due to lacking good qualified teachers' power
Amount compared with the quality of education of developed regions, can not largely cause the unfairness of educational resource distribution at all.And
With continuing to develop for technology, teleeducation system is in the ascendant, traditional low developed area, can be by based on intelligent terminal
Japanese Teaching system, receive outstanding educational resource, be low developed area service, traditional education be all using student and teacher as
Main, the teaching task of teacher is generally all very heavy.Disclosed in Patent No. CN201611032900.X patent document
A kind of Japanese Teaching system based on intelligent terminal, includes master server module, net broadcast system, simulation order program service system
System, signal are intercutted and short message broadcasting system, video/screen synch transmission system, mobile terminal and video interactive system；Network
Broadcast system is by network virtual channel to LAN subscriber INVENTIONBroadcast video or Web TV, audio signal or network radio station；Move
Dynamic terminal includes camera, noise reduction unit, CPU, storage device；Video interactive system include memory module and
Multiple display terminal modules.The Japanese Teaching system based on intelligent terminal of the present invention is used by master server module substantial length of operation
Family can remotely send control instruction, realize interaction using Internet communication technology, occasion is not limited, be not required to the meeting of costliness
Discuss equipment so that Japanese Teaching evaluation activity is more convenient and quick.
Above-mentioned patent document utilizes Internet communication technology, realizes interactive so that the occasion of discussion is not limited, still
For how to provide a kind of simple operation, radio communication is realized, the modernizing teaching of intelligent control is lacked with intelligent voice system
Technical solution.
The content of the invention
(1) technical problem solved
In view of the shortcomings of the prior art, the invention provides a kind of modernizing teaching intelligent voice system, for solving
How a kind of simple operation is provided, the problem of realizing radio communication, the modernizing teaching intelligent voice system of intelligent control.
(2) technical scheme
To realize object above, the present invention is achieved by the following technical programs：
A kind of modernizing teaching intelligent voice system, it is characterised in that：Including over-and under-voltage, delay protection circuit, language
Sound amplifying circuit, speech recording and reproducing integrated circuit, the transmission of voice signal optical fiber and wireless speech input circuit；The wireless speech is defeated
The high-frequency triode Q1A for entering circuit constitutes the oscillator of a capacitance three-point type using 9018 and electric capacity C1, C3, C5, by three poles
The load C 1 of pipe Q1A (9018) colelctor electrode, L1 constitute a resonator, pass through C3 positive feedback capacitors formation bikini resonance oscillations
Device principle, resonant frequency is exactly the tranmitting frequency of frequency modulation microphone, can make tranmitting frequency can be with by adjustment element L1 parameter
Between 88~108MHZ, the receives frequency of FM receiver is just covered, can easily be changed by the numerical value for adjusting L1
Tranmitting frequency, avoids FM radio station, and transmission signal is coupled to Q2A high-frequency amplifiers by C4, is carried out by high-frequency amplifier Q2A humorous
Shake after amplifying again by launching again on antenna, the speech recording and reproducing integrated circuit includes preamplifier, internal clocking, determined
When device, sampling clock, wave filter, automatic growth control, logic control, analog transceiver, decoder and EERPOM, the voice
Signal transmission by optical fiber uses the negative-feedback of operational amplifier in analog circuit, is filtered amplification to the voice signal of collection, so
Afterwards again by a triode to being biased to signal, amplification is filtered to the voice signal of collection, to reduce reception below
The distortion level of signal waveform.
It is preferred that, in the speech recording and reproducing integrated circuit recording press record button ground connection, be PD ends, P/R ends be low level,
Now start recording；At the end of unclamp button, single-chip microcomputer allows P/R ends to return to high level, has both completed the recording of one section of voice.Together
The method of sample can enroll second segment, the 3rd section etc..It is worth noting that, record length is no more than every section of voice set in advance
Time.The operation of playback is more simple, presses the bonded high level of recording, P/D ends P/R ends is started phonetic aspect of a dialect work(for low level
Energy；At the end of, button is unclamped, that is, completes the broadcasting of one section of voice.
It is preferred that, the voice amplification circuit can be amplified in microphone input signal by two-stage amplifying circuit, then be passed through
Inputted after the amplification of overpower amplifying circuit.On the other hand, line signal can also be by mixing preamplifier amplification output.When
Power output P=2W, electronics R=4 Ω, U=2.8V can be obtained by horse-power formula, can reach when inputting 100mV voltages to TDA2030
Design requirement.When microphone input signal is 5mV, require to reach 100mV after amplification, multiplication factor need to use two more than 20 times
Level amplification, at different levels is 5 times or so.Two-stage uses integrated operational amplifier, and microphone multiplication factor is set to A1, mixes putting for amplifier
Big multiple is set to A2, i.e. multiplication factor A=A1 × A2.
It is preferred that, the over-and under-voltage, delay protection circuit were made up of LM339 two comparators and RP2, RP3 etc.
Voltage, Undervoltage detection circuit, wherein L1A comparators are used for Zenith tracking, and L1C comparators are detected for under-voltage；VT1 structures
Into electronic switch, wherein LED is voltage indicator lamp, and when voltage is in civil power normal range (NR), the lamp is shinny, otherwise can extinguish；
NE555 time base circuits constitute delay memory circuit.
It is preferred that, after the over-and under-voltage, delay protection circuit switch on power, decompression of the 220V alternating currents through transformer,
After the rectification of rectifier bridge, voltage-stablizer 78L12 voltage stabilizing, about 12V direct-current working volts can be obtained at RP2 and RP3 two ends.According to change
The transformer ratio of depressor, adjusts potentiometer RP2 and RP3, makes line voltage in normal range (NR), upper and lower comparator all exports height
Level, now VT1 conductings, voltage indicator lamp LED keeps shinny.Because C1 two ends initial voltage is 0V, the threshold of 555 time base circuits
The value pin of end 6 is high level, and 555 time base circuits reset, and triode VT2 cut-offs, relay K1 normally-closed contact keeps adhesive, power supply
It is cut off.Then power supply charges to C1,2,6 bipod current potentials is constantly declined, and about by 5min, current potential can be made to be down to 12V voltages
1/3,555 time base circuit ability set, 3 pin output high level, VT2 conducting, relay K1 energization adhesives, its normally closed contact K-
1 disconnects, sound circuit energization work.
It is preferred that, when AC network accident power-off, C1 storage electric charges are released rapidly by R2, D5, when power system restoration is supplied
When electric, circuit postpones 5min or so and just powered to refrigerator again, so that it is guaranteed that compressor for refrigeration is without damage.When civil power electricity
Pressure is increased to more than 280V, and upper comparator exports low level；Line voltage drops to below 180V, and lower comparator exports low level
As long as one of both exports low level, VT1 cut-offs, LED extinguishes.Now 6 pin are high level, and circuit reset, the pin of output end 3 is low
Power level be cut off so that sound circuit overtension or it is too low in the case of be automatically stopped work, when voltage recover
When normal, circuit will postpone 5min or so and just be powered to sound circuit.
It is preferred that, the wireless speech input circuit R1 is Q1A9018 base biasing resistor, provides certain to triode
Base current, Q1A is operated in stable higher-order of oscillation area, R3 is DC feedback resistance, makes triode oscillatory work point steady
It is set for using.
(3) beneficial effect
Wireless speech of the present invention input realizes frequency modulation by changing between the base stage of triode and emitter stage electric capacity, when
When sound voltage signal is added in the base stage of triode, electric capacity can be believed with sound voltage between the base stage and emitter stage of triode
Synchronous change occurs for number size, while the frequency of oscillation of triode 9018 is occurred frequency deviation change realizes frequency modulation(PFM).This hair
It is bright the content of teachers to be recorded by speech recording and reproducing integrated circuit, and the content of recording can be played out, mistake
Under-voltage, delay protection circuit is pressed to postpone and protection circuit, high rate data transmission is realized in the transmission of voice signal optical fiber, with very strong
It is creative.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the speech recording and reproducing integrated circuit schematic diagram of the present invention；
Fig. 2 is the over-and under-voltage of the present invention, delay protection circuit schematic diagram；
Fig. 3 is the voice amplification circuit theory diagram of the present invention；
Fig. 4 is the voice signal optical fiber transmission principle figure of the present invention；
Fig. 5 is the wireless speech input circuit schematic diagram of the present invention.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
A kind of modernizing teaching intelligent voice system as Figure 1-5, it is characterised in that：Including over-and under-voltage, prolong
When protection circuit, voice amplification circuit, speech recording and reproducing integrated circuit, voice signal optical fiber transmission and wireless speech input circuit；
The high-frequency triode Q1A of wireless speech input circuit constitutes the vibration of a capacitance three-point type using 9018 and electric capacity C1, C3, C5
Device, a resonator is constituted by the load C 1 of triode Q1A (9018) colelctor electrode, L1, passes through 3 points of C3 positive feedback capacitors formation
Formula resonant oscillator principle, resonant frequency is exactly the tranmitting frequency of frequency modulation microphone, can make hair by adjustment element L1 parameter
Radio frequency rate between 88~108MHZ, can just cover the receives frequency of FM receiver, can be with by the numerical value for adjusting L1
Easily change tranmitting frequency, avoid FM radio station, transmission signal is coupled to Q2A high-frequency amplifiers by C4, by High frequency amplification
Device Q2A is carried out after resonance amplification again by launching again on antenna, and speech recording and reproducing integrated circuit includes preamplifier, inside
Clock, timer, sampling clock, wave filter, automatic growth control, logic control, analog transceiver, decoder and EERPOM,
The transmission of voice signal optical fiber is filtered to the voice signal of collection and put with the negative-feedback of operational amplifier in analog circuit
Greatly, amplification then is filtered to the voice signal of collection again by a triode to being biased to signal, to reduce below
Receive the distortion level of signal waveform.
In speech recording and reproducing integrated circuit recording press record button ground connection, be PD ends, P/R ends be low level, now start record
Sound；At the end of unclamp button, single-chip microcomputer allows P/R ends to return to high level, has both completed the recording of one section of voice.Same method can
Enroll second segment, the 3rd section etc..It is worth noting that, time of the record length no more than every section of voice set in advance.Put
The operation of sound is more simple, presses the bonded high level of recording, P/D ends P/R ends is started phonetic aspect of a dialect function for low level；At the end of,
Button is unclamped, that is, completes the broadcasting of one section of voice.
Voice amplification circuit can be amplified in microphone input signal by two-stage amplifying circuit, then by power amplification electricity
Inputted after the amplification of road.On the other hand, line signal can also be by mixing preamplifier amplification output.As power output P=
2W, electronics R=4 Ω, U=2.8V can be obtained by horse-power formula, and design requirement is can reach when inputting 100mV voltages to TDA2030.When
Microphone input signal is 5mV, requires to reach 100mV after amplification, multiplication factor need to be amplified more than 20 times using two-stage, at different levels
For 5 times or so.Two-stage uses integrated operational amplifier, and microphone multiplication factor is set to A1, and the multiplication factor of mixing amplifier is set to
A2, i.e. multiplication factor A=A1 × A2.
Over-and under-voltage, delay protection circuit constitute overvoltage, under-voltage by LM339 two comparators and RP2, RP3 etc.
Circuit is detected, wherein L1A comparators are used for Zenith tracking, and L1C comparators are detected for under-voltage；VT1 constitutes electronic switch,
Wherein LED is voltage indicator lamp, and when voltage is in civil power normal range (NR), the lamp is shinny, otherwise can extinguish；NE555 time base circuits
Constitute delay memory circuit.
After over-and under-voltage, delay protection circuit switch on power, decompression of the 220V alternating currents through transformer, rectifier bridge it is whole
After stream, voltage-stablizer 78L12 voltage stabilizing, about 12V direct-current working volts can be obtained at RP2 and RP3 two ends.According to the transformation of transformer
Coefficient, adjusts potentiometer RP2 and RP3, makes line voltage in normal range (NR), upper and lower comparator all exports high level, now
VT1 is turned on, and voltage indicator lamp LED keeps shinny.Because C1 two ends initial voltage is 0V, the pin of threshold value end 6 of 555 time base circuits is
High level, 555 time base circuits reset, triode VT2 cut-offs, and relay K1 normally-closed contact keeps adhesive, and power supply is cut off.So
Power supply charges to C1 afterwards, 2,6 bipod current potentials is constantly declined, and about by 5min, current potential can be made to be down to the 1/3,555 of 12V voltages
Time base circuit ability set, 3 pin output high level, VT2 conductings, relay K1 energization adhesives, its normally closed contact K-1 disconnects, language
Sound power on circuitry works.
When AC network accident power-off, C1 storage electric charges are released rapidly by R2, D5, when power system restoration is powered, electricity
Road postpones 5min or so and just powered to refrigerator again, so that it is guaranteed that compressor for refrigeration is without damage.When line voltage rise
To more than 280V, upper comparator exports low level；Line voltage drops to below 180V, as long as lower comparator exports low level two
One of person exports low level, and VT1 cut-offs, LED extinguishes.Now 6 pin are high level, and circuit reset, the pin of output end 3 is low level electricity
Source be cut off so that sound circuit overtension or it is too low in the case of be automatically stopped work, when voltage recover it is normal when,
Circuit will postpone 5min or so and just be powered to sound circuit.
Wireless speech input circuit R1 is Q1A9018 base biasing resistor, and certain base current is provided to triode,
Q1A is set to be operated in stable higher-order of oscillation area, R3 is DC feedback resistance, makes triode oscillatory work point stabilization.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
The present invention is described in detail, it will be understood by those within the art that：It still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic；And these modification or
Replace, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1. a kind of modernizing teaching intelligent voice system, it is characterised in that：Including over-and under-voltage, delay protection circuit, voice
Amplifying circuit, speech recording and reproducing integrated circuit, the transmission of voice signal optical fiber and wireless speech input circuit；The wireless speech input
The high-frequency triode Q1A of circuit constitutes the oscillator of a capacitance three-point type using 9018 and electric capacity C1, C3, C5, by triode
The load C 1 of Q1A (9018) colelctor electrode, L1 constitute a resonator, pass through C3 positive feedback capacitors formation bikini resonant oscillator
Principle, resonant frequency is exactly the tranmitting frequency of frequency modulation microphone, tranmitting frequency can be allow to exist by adjustment element L1 parameter
Between 88~108MHZ, the receives frequency of FM receiver is just covered, hair can easily be changed by the numerical value for adjusting L1
Radio frequency rate, avoids FM radio station, and transmission signal is coupled to Q2A high-frequency amplifiers by C4, and resonance is carried out by high-frequency amplifier Q2A
Again by launching again on antenna after amplification, the speech recording and reproducing integrated circuit includes preamplifier, internal clocking, timing
Device, sampling clock, wave filter, automatic growth control, logic control, analog transceiver, decoder and EERPOM, the voice letter
The transmission of number optical fiber is filtered amplification, then with the negative-feedback of operational amplifier in analog circuit to the voice signal of collection
Again by a triode to being biased to signal, amplification is filtered to the voice signal of collection, believed with the reception reduced below
The distortion level of number waveform.
2. modernizing teaching intelligent voice system according to claim 1, it is characterised in that：The speech recording and reproducing is integrated
In circuit recording press record button ground connection, be PD ends, P/R ends be low level, now start recording；At the end of unclamp button, it is single
Piece machine allows P/R ends to return to high level, has both completed the recording of one section of voice.Same method can enroll second segment, the 3rd section etc..
It is worth noting that, time of the record length no more than every section of voice set in advance.The operation of playback is more simple, presses
Record bonded high level, P/D ends P/R ends is started phonetic aspect of a dialect function for low level；At the end of, button is unclamped, that is, completes one section of language
The broadcasting of sound.
3. modernizing teaching intelligent voice system according to claim 1, it is characterised in that：The voice amplification circuit
It can be amplified, then be inputted after power amplification circuit amplifies by two-stage amplifying circuit in microphone input signal.The opposing party
Face, line signal can also be by mixing preamplifier amplification output.As power output P=2W, electronics R=4 Ω, by power
Formula can obtain U=2.8V, and design requirement is can reach when inputting 100mV voltages to TDA2030.When microphone input signal is 5mV, put
Require to reach 100mV after big, multiplication factor need to be amplified more than 20 times using two-stage, and at different levels is 5 times or so.Two-stage is used
Integrated operational amplifier, microphone multiplication factor is set to A1, the multiplication factor of mixing amplifier be set to A2, i.e. multiplication factor A=A1 ×
A2。
4. modernizing teaching intelligent voice system according to claim 1, it is characterised in that：The over-and under-voltage, prolong
When protection circuit constitute overvoltage, Undervoltage detection circuit by LM339 two comparators and RP2, RP3 etc., wherein L1A compares
Device is used for Zenith tracking, and L1C comparators are detected for under-voltage；VT1 constitutes electronic switch, and wherein LED is voltage indicator lamp,
When voltage is in civil power normal range (NR), the lamp is shinny, otherwise can extinguish；NE555 time base circuits constitute delay memory circuit.
5. modernizing teaching intelligent voice system according to claim 1, it is characterised in that：The over-and under-voltage, prolong
When protection circuit switch on power after, decompression of the 220V alternating currents through transformer, the rectification of rectifier bridge, voltage-stablizer 78L12 voltage stabilizing
Afterwards, about 12V direct-current working volts can be obtained at RP2 and RP3 two ends.According to the transformer ratio of transformer, adjustment potentiometer RP2 and
RP3, makes line voltage in normal range (NR), and upper and lower comparator all exports high level, and now VT1 is turned on, voltage indicator lamp LED
Keep shinny.Because C1 two ends initial voltage is 0V, the pin of threshold value end 6 of 555 time base circuits is high level, and 555 time base circuits are answered
Position, triode VT2 cut-offs, relay K1 normally-closed contact keeps adhesive, and power supply is cut off.Then power supply charges to C1, makes 2,6
Bipod current potential constantly declines, about by 5min, and current potential can be made to be down to 1/3,555 time base circuit ability set of 12V voltages, and 3 pin are defeated
Go out high level, VT2 conductings, relay K1 energization adhesives, its normally closed contact K-1 disconnects, sound circuit energization work.
6. modernizing teaching intelligent voice system according to claim 5, it is characterised in that：When AC network surprisingly breaks
When electric, C1 storage electric charges are released rapidly by R2, D5, when power system restoration is powered, and circuit postpones 5min or so just to electricity again
Refrigerator is powered, so that it is guaranteed that compressor for refrigeration is without damage.When line voltage is increased to more than 280V, upper comparator output is low
Level；Line voltage drops to below 180V, as long as lower comparator output low level one of both output low level, VT1 cut-offs,
LED extinguishes.Now 6 pin are high level, and circuit reset, the pin of output end 3 is cut off for low level power, so that sound circuit exists
Overtension or it is too low in the case of be automatically stopped work, when voltage recovers normal, circuit will postpone 5min or so just to language
Sound circuit is powered.
7. modernizing teaching intelligent voice system according to claim 1, it is characterised in that：The wireless speech input
Circuit R1 is Q1A9018 base biasing resistor, and certain base current is provided to triode, Q1A is operated in stable height
Frequency vibration swings area, and R3 is DC feedback resistance, makes triode oscillatory work point stabilization.
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| 百度文库: "语音放大电路", 《百度文库：HTTPSWENKU.BAIDU.COMVIEW12FEA404AF1FFC4FFF47AC33.HTML》 * |
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Application publication date: 20170728 |
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