CN104511036B - Disinfection cabinet intelligent sound control circuit - Google Patents
Disinfection cabinet intelligent sound control circuit Download PDFInfo
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- CN104511036B CN104511036B CN201310444544.2A CN201310444544A CN104511036B CN 104511036 B CN104511036 B CN 104511036B CN 201310444544 A CN201310444544 A CN 201310444544A CN 104511036 B CN104511036 B CN 104511036B
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Abstract
The invention discloses a kind of disinfection cabinet intelligent sound control circuit, including external power source, and the microphone circuit being electrically connected with the external power source respectively, single-chip microcomputer speech chip, DAC output circuits and loudspeaker, wherein, an output end for gathering the microphone circuit of voice signal is electrically connected to described for analyzing, process an input of the single-chip microcomputer speech chip of voice signal, input for amplifying the DAC output circuits of voice signal is electrically connected to an output end of the single-chip microcomputer speech chip, and the output end of the DAC output circuits is electrically connected with the loudspeaker.The disinfection cabinet intelligent sound control circuit can realize the control to difference in functionalitys such as disinfection cabinet startup, stoppings according to the voice command for identifying, operation height intellectuality, hommization, facilitation are user-friendly to.
Description
Technical field
The present invention relates to disinfection cabinet technical field, specifically provides a kind of disinfection cabinet intelligent sound control circuit.
Background technology
The requirement that disinfection cabinet is kept a public place clean with range hood and kitchen range collocation in having become family kitchen, and with electronics skill
The development of art, the various functions of disinfection cabinet also tend to intellectuality.At present, the disinfection cabinet in existing market is all by button mostly
It is interactive to realize, although this button operation is simple, the easy failure of key button, and a sometimes control command
Also need to user key-press can repeatedly complete, operate not convenient, hommization, do not meet people and height "smart" products are chased after
Ask.
The content of the invention
In order to overcome drawbacks described above, the invention provides a kind of disinfection cabinet intelligent sound control circuit, the control circuit letter
Easily safety, operates intelligent, hommization.
The technical scheme that adopted to solve its technical problem of the present invention is：A kind of disinfection cabinet intelligent sound control electricity
Road, including external power source and the microphone circuit being electrically connected with the external power source respectively, single-chip microcomputer speech chip, DAC
Output circuit and loudspeaker, wherein, the output end for gathering the microphone circuit of voice signal is electrically connected to described
For analyzing, processing an input of the single-chip microcomputer speech chip of voice signal, for amplifying the DAC outputs of voice signal
The input of circuit is electrically connected to an output end of the single-chip microcomputer speech chip, and the output end of the DAC output circuits with
The loudspeaker is electrically connected.
As a further improvement on the present invention, the single-chip microcomputer speech chip is integrated with voice module, A/D analog-digital converters
With D/A digital to analog converters, an input of the voice module is electrically connected to an output end of the microphone circuit, institute's predicate
One output end of sound module is electrically connected to the D/A digital to analog converters, and the D/A Jing after connecting the A/D analog-digital converters
The output end of digital to analog converter is electrically connected to the input of the DAC output circuits.
As a further improvement on the present invention, the voice module includes speech processing module and automatic gain module,
The speech processing module is electrically connected with the automatic gain module；The microphone circuit includes microphone, RC ∏ types
One filter circuit and echo cancel circuit, the microphone are coupled to an input of the first filter circuit of the RC ∏ types and institute
State between the output end of echo cancel circuit, the output end of the first filter circuit of the RC ∏ types is electrically connected to the speech processes
One input of module, an input of the echo cancel circuit are electrically connected to the positive pole of the external power source output, and together
Another input of Shi Suoshu echo cancel circuits is also electrically coupled to the positive pole of the automatic gain module output.
As a further improvement on the present invention, the microphone circuit also includes feedback capacity circuit, the feedback electricity
Capacitive circuit is electrically connected to another input of first filter circuit of positive pole and the RC ∏ types of the speech processing module output
Between.
As a further improvement on the present invention, the feedback capacity circuit is made up of the 7th electric capacity and ends of the earth property electric capacity,
Ground connection, the other end of the 7th electric capacity and the ends of the earth behind one end of 7th electric capacity and the negative electrode parallel connection of the 8th polar capacitor
Property electric capacity positive pole parallel connection after be electrically connected to the positive pole of speech processing module output；
The first filter circuit of the RC ∏ types is by the 5th electric capacity, the 6th electric capacity, the 4th resistance, the 5th resistance and the 6th resistance
Composition, wherein, one end of the 5th electric capacity and the 6th electric capacity is coupled on the coil of the microphone, the 5th electric capacity
The input that be electrically connected to the speech processing module is corresponded to the other end of the 6th electric capacity；One end of 4th resistance
It is electrically connected to one end of the 6th electric capacity, the other end ground connection of the 4th resistance, the 5th resistance and the 6th resistance
One end corresponds to respectively and is electrically connected to the other end of the 6th electric capacity and the 5th electric capacity, and the 5th resistance and the 6th resistance
The other end corresponds to the positive pole of the other end and the 8th polar capacitor that are electrically connected to the 7th electric capacity respectively；
The echo cancel circuit is electric by second resistance, 3rd resistor, quadripolarity electric capacity, the 9th polar capacitor and the 7th
Resistance composition, wherein, one end of the second resistance is electrically connected to the external power source, and the other end of the second resistance has two
Individual parallel branch, one branch road are electrically connected on the coil of the microphone Jing after concatenating the 3rd resistor, another branch road electricity
It is grounded after being connected to the negative pole parallel connection of the positive pole of the quadripolarity electric capacity, the quadripolarity electric capacity and the 9th polar capacitor,
And the positive pole of the 9th polar capacitor is electrically connected to the positive pole of the automatic gain module output, another 7th resistor coupled in parallel
It is connected between the positive and negative electrode of the 9th polar capacitor.
As a further improvement on the present invention, the DAC output circuits include the second filter circuit and signal amplifier, institute
The input for stating the second filter circuit is electrically connected to the output end of the D/A digital to analog converters, second filter circuit it is defeated
Go out the input that end is electrically connected to the signal amplifier, and the signal amplifier（U1）Output end be electrically connected to described raising
Sound device.
As a further improvement on the present invention, second filter circuit by first resistor, the first electric capacity, resistor,
Two electric capacity and the 3rd electric capacity, composition, wherein, after one end parallel connection of the first resistor, the first electric capacity, resistor and the 3rd electric capacity
Ground connection, is electrically connected to the defeated of the D/A digital to analog converters after the other end parallel connection of the first resistor, the first electric capacity and resistor
Go out end；The other end of another 3rd electric capacity and the second electric capacity corresponds to the 3rd pin for being electrically connected to the signal amplifier respectively
And second pin, and one end of second electric capacity is also electrically coupled to the adjustable side of the resistor.
As a further improvement on the present invention, the 4th pin of the signal amplifier is electrically connected the 3rd electric capacity
It is grounded behind one end, the 7th pin of the signal amplifier is electrically connected to the external power source.
The invention has the beneficial effects as follows：Voice signal is gathered first with the microphone circuit, and by the voice signal
It is transferred to single-chip microcomputer speech chip to be processed, is then turned by the voice module inside single-chip microcomputer speech chip, A/D moduluses again
Parallel operation and D/A digital to analog converters are processed and are stored to the voice signal successively, are completed to language finally by DAC output circuits
The amplification of message analog quantity, and deliver to loudspeaker sounding；The disinfection cabinet intelligent sound control circuit can be according to the language for identifying
The control of difference in functionality such as realizing starting disinfection cabinet, stop, operation height intellectuality, hommization, facilitation are square for sound order
Just user uses.
Description of the drawings
Fig. 1 is the operation principle schematic diagram of the present invention；
Fig. 2 is the circuit theory schematic diagram of microphone circuit of the present invention；
Fig. 3 is the circuit theory schematic diagram of DAC output circuits of the present invention.
With reference to accompanying drawing, make the following instructions：
1 --- microphone circuit 2 --- voice module
3 --- A/D analog-digital converters 4 --- D/A digital to analog converters
5 --- DAC output circuits 6 --- loudspeaker
10 --- microphone 11 --- RC ∏ first filter circuits of type
12 --- echo cancel circuit 13 --- feedback capacity circuit
20 --- speech processing module 21 --- automatic gain module
50 --- the second filter circuit
Specific embodiment
Referring to figure to a preferred embodiment of the present invention will be described in detail.
A kind of disinfection cabinet intelligent sound control circuit of the present invention, including external power source VCC and respectively with it is described
Microphone circuit 1, single-chip microcomputer speech chip, DAC output circuits 5 and loudspeaker 6 that external power source VCC is electrically connected, wherein, use
It is electrically connected in an output end of the microphone circuit 1 of collection voice signal described for analyzing, processing voice signal
One input of single-chip microcomputer speech chip, the input for amplifying the DAC output circuits 5 of voice signal are electrically connected to institute
An output end of single-chip microcomputer speech chip is stated, and the output end of the DAC output circuits 5 is electrically connected with the loudspeaker 6.
In the present embodiment, the single-chip microcomputer speech chip is integrated with voice module 2, A/D analog-digital converters 3 and D/A numbers
Weighted-voltage D/A converter 4, an input of the voice module 2 are electrically connected to an output end of the microphone circuit 1, the voice mould
One output end of block 2 is electrically connected to the D/A digital to analog converters 4, and the D/A numbers Jing after connecting the A/D analog-digital converters 3
The output end of weighted-voltage D/A converter 4 is electrically connected to the input of the DAC output circuits 5.
In the present embodiment, the voice module 2 includes speech processing module 20 and automatic gain module 21, institute's predicate
Sound processing module is electrically connected with the automatic gain module；The microphone circuit 1 includes that microphone 10, RC ∏ types first are filtered
Wave circuit 11 and echo cancel circuit 12, the microphone 10 are coupled to an input of the first filter circuit of the RC ∏ types 11
And the output end of the echo cancel circuit 12 between, the output end of the first filter circuit of the RC ∏ types 11 is electrically connected to described
One input of speech processing module 20, an input of the echo cancel circuit 12 are electrically connected to the external power source output
Positive pole, and while another input of the echo cancel circuit 12 is also electrically coupled to the automatic gain module 21 output
Positive pole.
The microphone circuit 1 also includes feedback capacity circuit 13, and the feedback capacity circuit 13 is electrically connected to described
Between the positive pole and another input of the first filter circuit of the RC ∏ types 11 of the output of speech processing module 20.
Preferably, the feedback capacity circuit 13 is made up of the 7th electric capacity C7 and the 8th polar capacitor C8, and the described 7th is electric
It is grounded after holding one end of C7 and the negative electrode parallel connection of the 8th polar capacitor C8, the other end of the 7th electric capacity C7 and ends of the earth property are electric
The positive pole of the output of the speech processing module 20 is electrically connected to after the positive pole parallel connection for holding C8；
The RC ∏ types the first filter circuit 11 is by the 5th electric capacity C5, the 6th electric capacity C6, the 4th resistance R4, the 5th resistance R5
Constitute with the 6th resistance R6, wherein, one end of the 5th electric capacity C5 and the 6th electric capacity C6 is coupled to the line of the microphone
On circle, the other end of the 5th electric capacity C5 and the 6th electric capacity C6 is corresponded to and is electrically connected to the defeated of the speech processing module 20
Enter end；One end of the 4th resistance R4 is electrically connected to one end of the 6th electric capacity C6, the other end of the 4th resistance R4
Ground connection, one end of the 5th resistance R5 and the 6th resistance R6 correspond to respectively and are electrically connected to the 6th electric capacity C6 and the 5th electric capacity
The other end of C5, and the other end of the 5th resistance R5 and the 6th resistance R6 respectively correspond to be electrically connected to the 7th electric capacity C7
The other end and the 8th polar capacitor C8 positive pole；
The echo cancel circuit 12 is by second resistance R2,3rd resistor R3, quadripolarity electric capacity C4, the 9th polar capacitor
C9 and the 7th resistance R7 compositions, wherein, one end of second resistance R2 is electrically connected to the external power source VCC, and described second
The other end of resistance R2 has two parallel branches, and one branch road is electrically connected to the Mike Jing after concatenating 3rd resistor R3
On the coil of wind, another branch road is electrically connected to the positive pole of the quadripolarity electric capacity C4, the quadripolarity electric capacity C4 and the 9th
It is grounded after the negative pole parallel connection of polar capacitor C9, and the positive pole of the 9th polar capacitor C9 is electrically connected to the automatic gain module
The positive pole of 21 outputs, the another 7th resistance R7 are connected in parallel between the positive and negative electrode of the 9th polar capacitor C9.
In the present embodiment, the DAC output circuits 5 include the second filter circuit 50 and signal amplifier U1, described
The input of two filter circuits 50 is electrically connected to the output end of the D/A digital to analog converters 4, second filter circuit 50 it is defeated
Go out the input that end is electrically connected to the signal amplifier U1, and the output end of the signal amplifier U1（That is the 6th pin）Electricity
It is connected to the loudspeaker 6.
Preferably, second filter circuit 50 is by first resistor R1, the first electric capacity C1, resistor R8, the second electric capacity C2
With the 3rd electric capacity C3, composition, wherein, first resistor R1, the first electric capacity C1, resistor R8 and the 3rd electric capacity C3 one end simultaneously
It is grounded after connection, after first resistor R1, the other end parallel connection of the first electric capacity C1 and resistor R8, is electrically connected to the D/A digital-to-analogues
The output end of converter 4；The other end of the another 3rd electric capacity C3 and the second electric capacity C2 is corresponded to respectively and is electrically connected to the signal
3rd pin of amplifier U1（Positive terminal）And second pin（Negative terminal）, and one end of the second electric capacity C2 is also electrically connected
It is connected to the adjustable side of the resistor R8.
4th pin of the signal amplifier U1 is grounded after being electrically connected one end of the 3rd electric capacity C3, the signal
7th pin of amplifier U1 is electrically connected to the external power source VCC.
Claims (5)
1. a kind of disinfection cabinet intelligent sound control circuit, it is characterised in that：Including external power source (VCC), and respectively with it is described
Microphone circuit (1), single-chip microcomputer speech chip, DAC output circuits (5) and loudspeaker that external power source (VCC) is electrically connected
(6), wherein, the output end for gathering the microphone circuit (1) of voice signal is electrically connected to described for analyzing, locating
One input of the single-chip microcomputer speech chip of reason voice signal, for amplifying the defeated of the DAC output circuits (5) of voice signal
Enter the output end that end is electrically connected to the single-chip microcomputer speech chip, and the output end of the DAC output circuits (5) is raised with described
Sound device (6) is electrically connected；
The single-chip microcomputer speech chip is integrated with voice module (2), A/D analog-digital converters (3) and D/A digital to analog converters (4), institute
The input for stating voice module (2) is electrically connected to an output end of the microphone circuit (1), the voice module (2)
One output end is electrically connected to the D/A digital to analog converters (4), and the D/A numbers Jing after connecting the A/D analog-digital converters (3)
The output end of weighted-voltage D/A converter (4) is electrically connected to the input of the DAC output circuits (5)；
The voice module (2) includes speech processing module (20) and automatic gain module (21), the speech processing module
It is electrically connected with the automatic gain module；The microphone circuit (1) includes microphone (10), RC ∏ the first filter circuits of type
(11) and echo cancel circuit (12), the microphone (10) is coupled to an input of the first filter circuit of the RC ∏ types (11)
Between end and the output end of the echo cancel circuit (12), the output end electrical connection of the first filter circuit of the RC ∏ types (11)
In an input of the speech processing module (20), an input of the echo cancel circuit (12) is electrically connected to outside described
The positive pole of portion's power supply output, and while another input of the echo cancel circuit (12) is also electrically coupled to the automatic gain
The positive pole that module (21) is exported；
The DAC output circuits (5) include the second filter circuit (50) and signal amplifier (U1), second filter circuit
(50) input is electrically connected to the output end of the D/A digital to analog converters (4), the output end of second filter circuit (50)
The input of the signal amplifier (U1) is electrically connected to, and the output end of the signal amplifier (U1) is electrically connected to described raising
Sound device (6).
2. disinfection cabinet intelligent sound control circuit according to claim 1, it is characterised in that：The microphone circuit (1)
Feedback capacity circuit (13) is included also, the feedback capacity circuit (13) is electrically connected to the speech processing module (20) output
Positive pole and another input of the first filter circuit of the RC ∏ types (11) between.
3. disinfection cabinet intelligent sound control circuit according to claim 2, it is characterised in that：The feedback capacity circuit
(13) it is made up of the 7th electric capacity (C7) and the 8th polar capacitor (C8), one end of the 7th electric capacity (C7) and the 8th polar capacitor
(C8) it is grounded after negative electrode parallel connection, electricity after the positive pole parallel connection of the other end and the 8th polar capacitor (C8) of the 7th electric capacity (C7)
It is connected to the positive pole that the speech processing module (20) is exported；
The first filter circuit of the RC ∏ types (11) are by the 5th electric capacity (C5), the 6th electric capacity (C6), the 4th resistance (R4), the 5th electric
Resistance (R5) and the 6th resistance (R6) composition, wherein, one end of the 5th electric capacity (C5) and the 6th electric capacity (C6) is coupled to institute
State on the coil of microphone, the other end of the 5th electric capacity (C5) and the 6th electric capacity (C6) is corresponded to and is electrically connected to the voice
One input of processing module (20)；One end of 4th resistance (R4) is electrically connected to one end of the 6th electric capacity (C6),
One end of the other end ground connection of the 4th resistance (R4), the 5th resistance (R5) and the 6th resistance (R6) corresponds to respectively and is electrically connected
It is connected to the other end of the 6th electric capacity (C6) and the 5th electric capacity (C5), and the 5th resistance (R5) and the 6th resistance (R6)
The other end respectively correspond to be electrically connected to the 7th electric capacity (C7) the other end and the 8th polar capacitor (C8) positive pole；
The echo cancel circuit (12) is by second resistance (R2), 3rd resistor (R3), quadripolarity electric capacity (C4), the 9th polarity
Electric capacity (C9) and the 7th resistance (R7) composition, wherein, one end of the second resistance (R2) is electrically connected to the external power source
(VCC), the other end of the second resistance (R2) has two parallel branches, and one branch road Jing concatenates the 3rd resistor (R3)
It is electrically connected on the coil of the microphone afterwards, another branch road is electrically connected to the positive pole of the quadripolarity electric capacity (C4), described
It is grounded after the negative pole parallel connection of quadripolarity electric capacity (C4) and the 9th polar capacitor (C9), and the 9th polar capacitor (C9) is just
Pole is electrically connected to the positive pole that the automatic gain module (21) exports, and another 7th resistance (R7) is connected in the described 9th in parallel
Between the positive and negative electrode of polar capacitor (C9).
4. disinfection cabinet intelligent sound control circuit according to claim 1, it is characterised in that：Second filter circuit
(50) it is made up of first resistor (R1), the first electric capacity (C1), resistor (R8), the second electric capacity (C2) and the 3rd electric capacity (C3), its
In, it is grounded after one end parallel connection of the first resistor (R1), the first electric capacity (C1), resistor (R8) and the 3rd electric capacity (C3), institute
The D/A digital-to-analogue conversions are electrically connected to after the other end parallel connection for stating first resistor (R1), the first electric capacity (C1) and resistor (R8)
The output end of device (4)；The other end of another 3rd electric capacity (C3) and the second electric capacity (C2) is corresponded to respectively and is electrically connected to the letter
3rd pin and second pin of number amplifier (U1), and one end of second electric capacity (C2) is also electrically coupled to the resistor
(R8) adjustable side.
5. disinfection cabinet intelligent sound control circuit according to claim 4, it is characterised in that：The signal amplifier (U1)
The 4th pin be electrically connected behind one end of the 3rd electric capacity (C3) and be grounded, the 7th pin of the signal amplifier (U1)
It is electrically connected to the external power source (VCC).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310444544.2A CN104511036B (en) | 2013-09-26 | 2013-09-26 | Disinfection cabinet intelligent sound control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310444544.2A CN104511036B (en) | 2013-09-26 | 2013-09-26 | Disinfection cabinet intelligent sound control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN104511036A CN104511036A (en) | 2015-04-15 |
| CN104511036B true CN104511036B (en) | 2017-04-05 |
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ID=52787274
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310444544.2A Active CN104511036B (en) | 2013-09-26 | 2013-09-26 | Disinfection cabinet intelligent sound control circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658408A (en) * | 2016-11-30 | 2017-05-10 | 桂林市逸仙中学 | Student school attending position real-time positioning system |
| CN109994107B (en) * | 2017-12-30 | 2021-12-07 | 青岛海尔智慧厨房电器有限公司 | Control method of voice disinfection cabinet and voice disinfection cabinet |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101315770A (en) * | 2008-05-27 | 2008-12-03 | 北京承芯卓越科技有限公司 | System on speech recognition piece and voice recognition method using the same |
| CN202563884U (en) * | 2011-11-18 | 2012-11-28 | 深圳市派高模业有限公司 | Voice recognition processor and intelligent device |
| CN202887351U (en) * | 2012-10-31 | 2013-04-17 | 牛运玲 | Anti-theft device capable of recognizing voice |
| CN203458619U (en) * | 2013-09-26 | 2014-03-05 | 樱花卫厨（中国）股份有限公司 | Intelligent voice control circuit of disinfection cabinet |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102800312A (en) * | 2011-05-24 | 2012-11-28 | 鸿富锦精密工业（深圳）有限公司 | Voice control system and method |
-
2013
- 2013-09-26 CN CN201310444544.2A patent/CN104511036B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101315770A (en) * | 2008-05-27 | 2008-12-03 | 北京承芯卓越科技有限公司 | System on speech recognition piece and voice recognition method using the same |
| CN202563884U (en) * | 2011-11-18 | 2012-11-28 | 深圳市派高模业有限公司 | Voice recognition processor and intelligent device |
| CN202887351U (en) * | 2012-10-31 | 2013-04-17 | 牛运玲 | Anti-theft device capable of recognizing voice |
| CN203458619U (en) * | 2013-09-26 | 2014-03-05 | 樱花卫厨（中国）股份有限公司 | Intelligent voice control circuit of disinfection cabinet |
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