CN105915864A - Visible analog indoor intercom controlled by single chip and control method - Google Patents
Visible analog indoor intercom controlled by single chip and control method Download PDFInfo
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- CN105915864A CN105915864A CN201610480584.6A CN201610480584A CN105915864A CN 105915864 A CN105915864 A CN 105915864A CN 201610480584 A CN201610480584 A CN 201610480584A CN 105915864 A CN105915864 A CN 105915864A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/183—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a single remote source
- H04N7/186—Video door telephones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
- H04N7/142—Constructional details of the terminal equipment, e.g. arrangements of the camera and the display
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a visible analog indoor intercom controlled by a single chip and a control method. The visible analog indoor intercom comprises a power supply input conversion module, a main control module, an audio input and output module, a video signal amplification module and an LCD driving module, wherein the power supply input conversion module, the audio input and output module, the video signal amplification module and the LCD driving module are connected to the main control module. According to the invention, system communication and control and a video display function can be achieved by one chip, and due to the high integration property, the wiring of a circuit board can be simplified, the area of the circuit board can be decreased, the parts and components can be saved, and the production procedures can be saved, so that the development difficulty and the production cost of the products are reduced.
Description
Technical field
The present invention relates to the research field of transmitter receiver, the visual simulation controlled particularly to a kind of single-chip is indoor
Transmitter receiver and control method.
Background technology
At present in the middle of daily life, the traditional analog that family or office use visually indoor intercommunication
The confidential video that realizes shows, it usually needs system master chip coordinates single video playback module to realize.Its
Middle system master chip is used for realizing the function such as system communication, system job control, single video playback mould
Block accesses mainboard by winding displacement, by master control chip controls, is specifically designed to process analog video signal and drives liquid
Brilliant screen display diagram picture.Due to standalone module to be used, can to a certain degree improve circuit design difficulty and
Production cost, increases the operation in production process, and major part video playback module is not supported to adjust video simultaneously
The function of display parameters, it is impossible to use environment to modulate, to a certain degree according to the liquid crystal display screen used or product
Have impact on display effect.
Additionally, the visual intercom of traditional analog generally lacks system setting function.Some has system to arrange
The visual intercom of simulation of function, function interface is simple, and without prompting interface and suggestion voice, user
That does not often know oneself during arranging arranges operation the most successfully.
Summary of the invention
Present invention is primarily targeted at the shortcoming overcoming prior art with not enough, it is provided that a kind of single-chip controls
Visual simulation intercom and control method, by a chip can be achieved with system communication and control with
And video display function.
In order to achieve the above object, the present invention is by the following technical solutions:
A kind of single-chip of the present invention control visual simulation intercom, including power supply input modular converter,
Main control module, audio frequency input/output module, video signal amplification module and liquid crystal display screen drive module, described
Power supply input modular converter, audio frequency input/output module, video signal amplification module and liquid crystal display screen drive mould
Block is all connected with main control module；
Described power supply input modular converter, for changing into stable DC-9V by DC-12V/24V input voltage
With DC-5V voltage；
Described main control module, for controlling broadcasting and the intercommunication function of audio frequency and video, and realizes communication and menu sets
Put function；
Described audio frequency input/output module, changes into the tinkle of bells audio frequency for the pwm signal that main control module is transmitted
Signal is also play, and the intercommunication audio signal coming in outside input is play after being filtered amplifying, and Mike
The weak audio signal that wind is collected exports after being amplified, and controls ringing volume and intercommunication volume
Described video signal amplification module, filters for the pal mode video signal coming in outside input
Ripple amplifies；
Described liquid crystal display screen drives module, for pal mode decoding video signal is play, and can be to liquid
The brightness of brilliant screen and image are adjusted than degree.
As preferred technical scheme, described power supply input modular converter includes that high-voltage pulse damages circuit, guarantor
Danger silk FL1 and LC filter circuit, described high-voltage pulse infringement circuit includes diode D5 and diode
D6, the negative electrode of described diode D5 and diode D6 be connected after again one end with electric fuse FL1 be connected, institute
The other end stating electric fuse connects LC filter circuit.
As preferred technical scheme, described main control module includes processor chips U1, for processor chips
U1 provides the oscillating circuit of operating clock signals, filter circuit and storage circuit；Described oscillating circuit, filter
Wave circuit and storage circuit are all connected with processor chips U1.
As preferred technical scheme, described storage circuit uses FLASH chip U2, described FLASH core
Sheet U2 is for the tinkle of bells WAV storing the performed binary program code of system, calling intercom is play
Audio file and for realizing the WAV audio file of voice message；Processor chips U1 are passed through
Tetra-pins of SPI_CLK, SPI_DO, SPI_DI, SPI_CS are connected via exclusion RN8 with U2.
As preferred technical scheme, described audio frequency input/output module includes power-supplying circuit, PWM ripple
DA change-over circuit, audio frequency filter circuit, volume control circuit, microphone amplifying circuit and loudspeaker power amplifier electricity
Road, described PWM ripple DA change-over circuit and audio frequency filter circuit be connected with volume control circuit, described volume
Control circuit is also connected with power-supplying circuit and loudspeaker power amplifier, described power amplification control circuit also with wheat
Gram wind amplifying circuit and loudspeaker power amplifier connect.
As preferred technical scheme, described video signal amplification module include video signal amplification chip U5,
RC network input circuit, RC network output circuit, input signal forms via electric capacity C26, resistance R16
RC network input circuit is to video signal amplification chip U5, then through resistance R14, electric capacity C24 and electric capacity C23
The RC network output circuit of composition is to the video signal input terminal of main control module.
As preferred technical scheme, described liquid crystal display screen drives module to include LCD Interface circuit and liquid crystal display screen
Backlight control circuit, described LCD Interface circuit and liquid crystal screen backlight control circuit are all connected with main control module.
Under the control method of the visual simulation intercom that present invention also offers the control of a kind of single-chip includes
State step:
S1, by Power Entry Module DC-12V/24V input voltage changed into stable DC-9V and
DC-5V voltage；
S2, by the broadcasting of master control module controls audio frequency and video and intercommunication function, and realize communication and menu setting
Function；
S3, when transmitter receiver output audio frequency time, by audio frequency input/output module, the PWM that main control module is transmitted
Signal changes into the tinkle of bells audio signal and plays, and the intercommunication audio signal coming in outside input is filtered putting
Play after big, and the weak audio signal that mike is collected be amplified after export, control ringing volume
With intercommunication volume；
S4, when transmitter receiver output video time, by video signal amplification module to outside input come in PAL
Standard video signal is filtered amplifying；Then drive module that pal mode video signal is entered by liquid crystal display screen
Row decoding is play, and is adjusted liquid crystal display screen brightness and image than degree.
As preferred technical scheme, when realizing the output of screen signal, comprise the steps:
S21, the analog video signal of pal mode is input to AV_IN end；
S22, then allow the filter circuit that video signal forms through C26, R16；
S23, allow video signal be input to U5 to be amplified；
S24, video signal is carried out second time filter, be input to control circuit；
S25, control circuit are demodulated rear drive liquid crystal display screen circuit display image to video signal.
As preferred technical scheme, when realizing audio signal output, comprise the steps:
The wav file being saved in FLASH chip is read out by S31, control circuit every 150us,
Read a byte data every time；
S32, control circuit control the PWM ripple of I/O port output fixed frequency, and according to reading every time
Size of data changes the dutycycle of IPWM ripple；
S33, the PWM ripple that dutycycle is continually changing are input to filter circuit through WAVPWM end,
VIN1 end can obtain the musical waveform that wav file is corresponding；
S34, musical waveform is input to volume control circuit, to realize the control to volume of music；
S35, finally musical waveform is input to power amplification circuit, music can be play by loudspeaker.
The present invention compared with prior art, has the advantage that and beneficial effect:
1, the present invention only can be achieved with system communication and control and video display function with a chip, and it is high
The feature of integrated level can simplify circuit board wiring, reduce board area, saving components and parts, simplification production
Operation, thus reduce research and development difficulty and the production cost of product.
2, the sound prompt function of the present invention makes user carry out to obtain more humane body when system is arranged
Test.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of power supply of the present invention input modular converter；
Fig. 2 is the circuit theory diagrams of DC-DC decompression voltage regulator of the present invention；
Fig. 3 is the circuit theory diagrams of three-terminal voltage-stabilizing chip U4 of the present invention；
Fig. 4 is the circuit theory diagrams of main control module of the present invention；
Fig. 5 is the circuit theory diagrams of FLASH chip U2 of the present invention；
Fig. 6 is the circuit theory diagrams of power-supplying circuit of the present invention；
Fig. 7 is the circuit theory diagrams of DA change-over circuit of the present invention；
Fig. 8 is the circuit theory diagrams of audio frequency filter circuit of the present invention；
Fig. 9 is the circuit theory diagrams of volume control circuit of the present invention；
Figure 10 is the circuit theory diagrams of inventive microphone amplifying circuit；
Figure 11 is the circuit theory diagrams of loudspeaker power amplifier of the present invention；
Figure 12 is the circuit theory diagrams of video signal amplification module of the present invention；
Figure 13 is the circuit theory diagrams of LCD Interface circuit of the present invention；
Figure 14 is the circuit theory diagrams of liquid crystal screen backlight control circuit of the present invention；
Figure 15 is the block diagram of audio frequency input/output module of the present invention.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but the embodiment party of the present invention
Formula is not limited to this.
Embodiment
The visual simulation intercom that a kind of single-chip of the present embodiment controls, inputs modulus of conversion including power supply
Block, main control module, audio frequency input/output module, video signal amplification module and liquid crystal display screen drive module,
Described power supply input modular converter, audio frequency input/output module, video signal amplification module and liquid crystal display screen drive
Dynamic model block is all connected with main control module.
Described power supply input modular converter, for changing into stable DC-9V by DC-12V/24V input voltage
With DC-5V voltage；
Described main control module, for controlling broadcasting and the intercommunication function of audio frequency and video, and realizes communication and menu sets
Put function；
Described audio frequency input/output module, changes into the tinkle of bells audio frequency for the pwm signal that main control module is transmitted
Signal is also play, and the intercommunication audio signal coming in outside input is play after being filtered amplifying, and Mike
The weak audio signal that wind is collected exports after being amplified, and controls ringing volume and intercommunication volume
Described video signal amplification module, filters for the pal mode video signal coming in outside input
Ripple amplifies；
Described liquid crystal display screen drives module, for pal mode decoding video signal is play, and can be to liquid
The brightness of brilliant screen and image are adjusted than degree.
As it is shown in figure 1, described power supply input modular converter include high-voltage pulse infringement circuit, electric fuse FL1,
And LC filter circuit, described high-voltage pulse infringement circuit includes diode D5 and diode D6, described
The negative electrode of diode D5 and diode D6 be connected after again one end with electric fuse FL1 be connected, described electric fuse
The other end connect LC filter circuit.Power supply input modular converter operation principle: input voltage (scope+12V
To+24V) input at VIN, the effect of diode D5, D6 is to electricity respectively when input voltage reverse connection
Road carries out protecting and prevent instantaneous pressure pulse from damaging circuit, and FL1 is 500MA resettable fuse, when defeated
Enter electric current excessive time automatically disconnect, input current recover normal after reclose, reach the effect of protection circuit,
C27, L7, C28 collectively form LC filter circuit, and effect is the ripple reducing input voltage, such as Fig. 2 institute
Show.
As it is shown on figure 3, input voltage enters into DC-DC decompression voltage regulator after LC filter circuit,
Two parts decompression voltage regulator structure is identical, and feedback resistance R27, R28 resistance differs with R29, R53
Sample, it is achieved that the output of different magnitudes of voltage.Diode D7, D11 damage circuit for anti-instantaneous pressure pulse,
Inductance L8 is used for filtering, and electric capacity C29, C32 obtain more stable feedback voltage for filtering, electric capacity C30,
Output voltage is filtered by C31, C33, C34.Two parts circuit exports+9V with+5V ,+5V more respectively
Via three-terminal voltage-stabilizing chip U4 output+3.3V, C35, C36, C37 are filter capacitor.
As shown in Figure 4, described main control module includes processor chips U1, provides work for processor chips U1
Make the oscillating circuit of clock signal, filter circuit and storage circuit；Described oscillating circuit, filter circuit with
And storage circuit is all connected with processor chips U1.The core of main control module is a to be integrated with 51 single-chip microcomputers
The process of kernel, analog video signal, image enhaucament, AGC, OSD, GAMMA correction, TFT numeral
Screen drives the high performance chips U1 that multiple function is integrated.Crystal oscillator Y1, resistance R1, electric capacity C4, C5 are common
With forming oscillating circuit, provide operating clock signals for U1；C1, C3 are filter capacitor；L1, L2 are 0
Ohm magnetic bead, strobes；System electrification moment, the resetting pin of U1 was low level due to the existence of C2,
System reset, recovers high level subsequently.
As it is shown in figure 5, U2 is FLASH chip, it is used for the performed binary program code of the system that stores,
Also has the tinkle of bells WAV audio file play when calling intercom and for realizing voice message
WAV audio file.U1 passes through tetra-pins of SPI_CLK, SPI_DO, SPI_DI, SPI_CS via row
Resistance RN8 with U2 is connected；The effect of RN8 is to reduce the impact that signal is transmitted by electromagnetic interference, C12
For filter capacitor.The operation principle of other functional pin of U1 can illustrate in the introduction of other functional module.
In the present embodiment, audio frequency input/output module operation principle: by power-supplying circuit, PWM ripple DA
Change-over circuit, audio frequency filter circuit, volume control circuit, microphone amplifying circuit, loudspeaker power amplifier group
Become.The major function of module is to process the audio signal that input is come in and the PWM ripple exported by main control chip
Change into audio signal, then play out sound via loudspeaker；And the signal that mike (miaow head) exported
Process and amplify, being finally output to its exterior.As shown in figure 15, described audio frequency input/output module
Including power-supplying circuit, PWM ripple DA change-over circuit, audio frequency filter circuit, volume control circuit, wheat
Gram wind amplifying circuit and loudspeaker power amplifier, described PWM ripple DA change-over circuit and audio frequency filter circuit with
Volume control circuit connects, and described volume control circuit also connects with power-supplying circuit and loudspeaker power amplifier
Connecing, described power amplification control circuit is also connected with microphone amplifying circuit and loudspeaker power amplifier.
As shown in Figure 6, for power-supplying circuit, input be+9.0V ,+9.0V_PT be outfan,
Being used for powering to audio frequency input/output module, POWER connects main control chip and is controlled.When POWER is
During high level (+3.3V), Q7 turns on, R70=R71, and now Q6 base voltage is+4.5V, and Q6 turns on,
Input+9.0V and outfan+9.0V_PT turns on.When POWER is low level (0V), Q7 is not turned on,
Then Q6 is also not turned on, between input+9.0V and outfan+9.0V_PT by, it is achieved thereby that
The Control of Voltage of+9.0V_PT end.C65, C66 are filter capacitor, and L13 is used for realizing audio frequency input and output mould
Block ground end is connected with the single-point systematically held, and reduces the interference between audio frequency input/output module and system.
As it is shown in fig. 7, for PWM ripple DA change-over circuit:
(1) control circuit is every the 150us wav file (sampling resolution to being saved in FLASH chip
8bit, sample rate 8KHz) it is read out, read the data of a byte every time.
(2) main control chip is by the PWM ripple that WAVPWM end output frequency is 40KHz, and according to often
The secondary data read change dutycycle (such as data 0x00 correspondence PWM duty cycle 0%, the number of PWM ripple
According to 0xff correspondence PWM duty cycle 100%).
(3) PWM ripple exports after RC resistance-capacitance network is filtered through Q5 and obtains DC voltage, PWM
The change of ripple dutycycle can change the amplitude of DC voltage.Thus can come constantly according to WAV audio file
Change the dutycycle of PWM ripple, control VIN1 end DC voltage and be continually changing formation musical waveform.Diode
The effect of D8 is to prevent that Q5 output voltage is too high affects late-class circuit.
As shown in Figure 8, the audio signal that the outside input of described audio frequency filter circuit is come in is through low pass RC network
Next stage amplifying circuit is entered into after filtering High-frequency Interference.
As it is shown in figure 9, described volume control circuit, VIN1, VIN2 are the input of chip, and VIN1 is
The musical waveform obtained after PWM that dutycycle is continually changing is filtered, VIN2 is that outside input is come in through filter
Audio signal after ripple.VOUT1 is the outfan that VIN1 is corresponding, and VOU2 is the output that VIN2 is corresponding
End.SDA, SCL end is connected with main control chip and is controlled, owing to SDA, SCL end is open-drain output
End, main control chip supply voltage+3.3V, the resistance of R81, R82 two pull-up+3.3V must be increased.Three poles
Pipe Q8, Q9 are open-drain output, and digital regulation resistance chip U11 powers for+5.0V, so needing also exist for increasing
The resistance of R77, R79 two pull-up+5.0V.C64, C67 are filter capacitor, this volume control circuit energy
Realize the volume control of 21 grades.
As shown in Figure 10, in described microphone amplifying circuit, J4 is mike (miaow head), and+9.0V_PT is
9V feeder ear, provides bias voltage through R66, R68 dividing potential drop for mike.The audio signal of mike output
It is coupled to the positive input terminal of operational amplifier U9 through C47, R67, is coupled to operation amplifier through R65, C48
The negative input end of device U9.Signal is amplified removes that to be coupled to MIC end after DC component defeated again through C54 filtering
Go out to its exterior.L10 is filter inductance, and C49, C50 are filter capacitor, and C52 can play minimizing noise
Effect, C51, R69 together decide on the amplification of audio signal, and time vacant, amplification is 20.
As shown in figure 11, in described loudspeaker power amplifier, two-way output VOU1, VOU2 of volume control circuit
The positive input of amplifier U10 it is coupled to respectively, the negative sense input of amplifier through R73, C57 and R74, C58
End ground connection.VOU1, VOUT2 are amplified arrives loudspeaker through C62, C63 filtering output again.L12 is filtering
Inductance, C55, C56 are filter capacitor, and C60 can play the effect reducing noise, and C59, R75 determine jointly
The amplification of audio signal, time vacant, amplification is 20.
As shown in figure 12, in described video signal amplification module, AV_IN is the signal input part of module, R17
Being 0 ohmage, input signal is input to video signal amplification chip through the RC network that C26, R16 form
U5, then export the video signal input terminal of master control IC through the RC network of R14, C24, C23 composition
CVBS1_IN.R15 pull-up+3.3V, PWR_V receive main control chip and are controlled, during output high level
U5 does not works, and during output low level, U5 normally works.C25 is filter capacitor, and D3 is that TVS transient state presses down
Diode processed, effect is to prevent AV_IN input from instantaneous pressure pulse damage circuit occur.
As shown in figure 13, liquid crystal display screen drives module by LCD Interface circuit and liquid crystal screen backlight control circuit group
Become.The effect of LCD Interface circuit be for liquid crystal display screen logic circuit provide running voltage and to liquid crystal display screen with
Main control chip is attached.In LCD Interface circuit, C16 is filter capacitor, and C15, L4 are respectively filter
Ripple electric capacity and 0 ohm of magnetic bead, effect is the capacity of resisting disturbance improving clock line DCLK.LCDR0～LCDR7,
LCDG0～LCDG7, LCDB0～LCDB7 individually connect and are connected to master control after 33 ohmages
Chip, the effect of resistance is the interference free performance improving data wire.DCLK、HSYNC、VSYNC、DE
Directly it is connected with main control chip.
As shown in figure 14, liquid crystal screen backlight control circuit input voltage is+5.0V, and R4 is 0 ohmage,
C17, C18 are filter capacitor, and L5 is power inductance, and D1 is Schottky high speed diode, play rectified action,
Again through the positive pole of C19 filtering output to liquid crystal display screen backlight circuit；R7 is feedback resistance, is used for determining liquid crystal display screen
The maximum voltage of backlight circuit voltage input end positive pole BL+.DC-DC chip U3 is through BLPWM end and master
Control chip connect, main control chip output frequency be the PWM ripple of 20KHz to BLPWM end, and by control
The dutycycle of PWM ripple processed realizes the regulation to BL+, thus realizes the regulation to liquid crystal display screen backlight illumination.
When PWM ripple dutycycle is 100%, BL+ reaches maximum, and when PWM ripple dutycycle is 0%, BL+ reaches
Little value.
During simulation intercom called, main control chip enters by video amplifier module by controlling PWR_V end
Entering duty, now video signal is input to the video signal input terminal CVBS1_IN of main control chip, then
Drive liquid crystal display displays images by bottom hardware circuit in program control chip, open liquid crystal display screen backlight simultaneously.
Image display effect can be adjusted by amendment chip internal parameter.
The control method of the visual simulation intercom that single-chip described in the present embodiment item controls, including under
State step:
S1, by Power Entry Module DC-12V/24V input voltage changed into stable DC-9V and
DC-5V voltage；
S2, by the broadcasting of master control module controls audio frequency and video and intercommunication function, and realize communication and menu setting
Function；
S3, when transmitter receiver output audio frequency time, by audio frequency input/output module, the PWM that main control module is transmitted
Signal changes into the tinkle of bells audio signal and plays, and the intercommunication audio signal coming in outside input is filtered putting
Play after big, and the weak audio signal that mike is collected be amplified after export, control ringing volume
With intercommunication volume；
S4, when transmitter receiver output video time, by video signal amplification module to outside input come in PAL
Standard video signal is filtered amplifying；Then drive module that pal mode video signal is entered by liquid crystal display screen
Row decoding is play, and is adjusted liquid crystal display screen brightness and image than degree.
When realizing the output of screen signal, comprise the steps:
S21, the analog video signal of pal mode is input to AV_IN end；
S22, then allow the filter circuit that video signal forms through C26, R16；
S23, allow video signal be input to U5 to be amplified；
S24, video signal is carried out second time filter, be input to control circuit；
S25, control circuit are demodulated rear drive liquid crystal display screen circuit display image to video signal.
When realizing audio signal output, comprise the steps:
The wav file being saved in FLASH chip is read out by S31, control circuit every 150us,
Read a byte data every time；
S32, control circuit control the PWM ripple of I/O port output fixed frequency, and according to reading every time
Size of data changes the dutycycle of IPWM ripple；
S33, the PWM ripple that dutycycle is continually changing are input to filter circuit through WAVPWM end,
VIN1 end can obtain the musical waveform that wav file is corresponding；
S34, musical waveform is input to volume control circuit, to realize the control to volume of music；
S35, finally musical waveform is input to power amplification circuit, music can be play by loudspeaker.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by above-mentioned reality
Execute the restriction of example, the change made under other any spirit without departing from the present invention and principle, modification,
Substitute, combine, simplify, all should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (10)
1. the visual simulation intercom that a single-chip controls, it is characterised in that include that power supply input turns
Die change block, main control module, audio frequency input/output module, video signal amplification module and liquid crystal display screen drive mould
Block, described power supply input modular converter, audio frequency input/output module, video signal amplification module and liquid crystal
Screen drives module to be all connected with main control module；
Described power supply input modular converter, for changing into stable DC-9V by DC-12V/24V input voltage
With DC-5V voltage；
Described main control module, for controlling broadcasting and the intercommunication function of audio frequency and video, and realizes communication and menu sets
Put function；
Described audio frequency input/output module, changes into the tinkle of bells audio frequency for the pwm signal that main control module is transmitted
Signal is also play, and the intercommunication audio signal coming in outside input is play after being filtered amplifying, and Mike
The weak audio signal that wind is collected exports after being amplified, and controls ringing volume and intercommunication volume
Described video signal amplification module, filters for the pal mode video signal coming in outside input
Ripple amplifies；
Described liquid crystal display screen drives module, for pal mode decoding video signal is play, and can be to liquid
The brightness of brilliant screen and image are adjusted than degree.
The visual simulation intercom that single-chip the most according to claim 1 controls, it is characterised in that
Described power supply input modular converter includes high-voltage pulse infringement circuit, electric fuse FL1 and LC filter circuit,
Described high-voltage pulse infringement circuit includes diode D5 and diode D6, described diode D5 and diode
The negative electrode of D6 be connected after again one end with electric fuse FL1 be connected, the other end of described electric fuse connects LC and filters
Wave circuit.
The visual simulation intercom that single-chip the most according to claim 1 controls, it is characterised in that
Described main control module includes processor chips U1, provides the vibration of operating clock signals for processor chips U1
Circuit, filter circuit and storage circuit；Described oscillating circuit, filter circuit and storage circuit all with locate
Reason device chip U1 connects.
The visual simulation intercom that single-chip the most according to claim 3 controls, it is characterised in that
Described storage circuit uses FLASH chip U2, and described FLASH chip U2 is for storing holding of system
Row binary program code, calling intercom play the tinkle of bells WAV audio file and be used for realizing language
The WAV audio file of sound prompting；Processor chips U1 by SPI_CLK, SPI_DO, SPI_DI,
Tetra-pins of SPI_CS are connected via exclusion RN8 with U2.
The visual simulation intercom that single-chip the most according to claim 1 controls, it is characterised in that
Described audio frequency input/output module includes power-supplying circuit, PWM ripple DA change-over circuit, audio frequency filtered electrical
Road, volume control circuit, microphone amplifying circuit and loudspeaker power amplifier, described PWM ripple DA changes
Circuit and audio frequency filter circuit are connected with volume control circuit, and described volume control circuit is also electric with power supply control
Road and loudspeaker power amplifier connect, described power amplification control circuit also with microphone amplifying circuit and loudspeaker merit
Electric discharge road connects.
The visual simulation intercom that single-chip the most according to claim 1 controls, it is characterised in that
Described video signal amplification module includes video signal amplification chip U5, RC network input circuit, RC network
Output circuit, input signal is believed to video via electric capacity C26, resistance R16 composition RC network input circuit
Number amplification chip U5, then the RC network output circuit through resistance R14, electric capacity C24 and electric capacity C23 composition
Video signal input terminal to main control module.
The visual simulation intercom that single-chip the most according to claim 1 controls, it is characterised in that
Described liquid crystal display screen drives module to include LCD Interface circuit and liquid crystal screen backlight control circuit, described liquid crystal display screen
Interface circuit and liquid crystal screen backlight control circuit are all connected with main control module.
8. the visual simulation intercom controlled according to the single-chip according to any one of claim 1-7
Control method, it is characterised in that comprise the steps:
S1, by Power Entry Module DC-12V/24V input voltage changed into stable DC-9V and
DC-5V voltage；
S2, by the broadcasting of master control module controls audio frequency and video and intercommunication function, and realize communication and menu menu
Function is set；
S3, when transmitter receiver output audio frequency time, by audio frequency input/output module, the PWM that main control module is transmitted
Signal changes into the tinkle of bells audio signal and plays, and the intercommunication audio signal coming in outside input is filtered putting
Play after big, and the weak audio signal that mike is collected be amplified after export, control ringing volume
With intercommunication volume；
S4, when transmitter receiver output video time, by video signal amplification module to outside input come in PAL
Standard video signal is filtered amplifying；Then drive module that pal mode video signal is entered by liquid crystal display screen
Row decoding is play, and is adjusted liquid crystal display screen brightness and image than degree.
The control method of the visual simulation intercom that single-chip the most according to claim 8 controls,
It is characterized in that, when realizing the output of screen signal, comprise the steps:
S21, the analog video signal of pal mode is input to AV_IN end；
S22, then allow the filter circuit that video signal forms through C26, R16；
S23, allow video signal be input to U5 to be amplified；
S24, video signal is carried out second time filter, be input to control circuit；
S25, control circuit are demodulated rear drive liquid crystal display screen circuit display image to video signal.
The control method of the visual simulation intercom that single-chip the most according to claim 8 controls,
It is characterized in that, when realizing audio signal output, comprise the steps:
The wav file being saved in FLASH chip is read out by S31, control circuit every 150us,
Read a byte data every time；
S32, control circuit control the PWM ripple of I/O port output fixed frequency, and according to reading every time
Size of data changes the dutycycle of IPWM ripple；
S33, the PWM ripple that dutycycle is continually changing are input to filter circuit through WAVPWM end,
VIN1 end can obtain the musical waveform that wav file is corresponding；
S34, musical waveform is input to volume control circuit, to realize the control to volume of music；
S35, finally musical waveform is input to power amplification circuit, music can be play by loudspeaker.
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