CN110177183A - A kind of implementation method of fire telephone system - Google Patents
A kind of implementation method of fire telephone system Download PDFInfo
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- CN110177183A CN110177183A CN201910492670.2A CN201910492670A CN110177183A CN 110177183 A CN110177183 A CN 110177183A CN 201910492670 A CN201910492670 A CN 201910492670A CN 110177183 A CN110177183 A CN 110177183A
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- fire telephone
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- host
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/403—Bus networks with centralised control, e.g. polling
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- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
Abstract
The invention discloses a kind of implementation method of fire telephone system, this method includes host calling extension set and call extension host；The upload of signal is realized when the call extension host by fire telephone extension set voice feedback circuit, the voice signal that fire telephone extension set uploads is received by fire telephone extension set voice feedback circuit when host calling extension set simultaneously, is then restored the low level signal received in fire telephone extension set voice feedback circuit by fire telephone host voice communications circuit.Through the above scheme, invention achieves strong antijamming capability, can be realized the purpose transmitted at a distance, have very high practical value and promotional value.
Description
Technical field
The invention belongs to technical field of fire control, in particular, being to be related to a kind of implementation method of fire telephone system.
Background technique
Fire telephone is the special equipment of fire communication, and when a fire, it can be provided people with convenience efficiently
Means of communication is indispensable communication apparatus in fire-fighting control and alarm system.Fire telephone is divided into four-wire system fire telephone
With bus fire telephone, four-wire system fire telephone is worked at the same time by one group of power supply line and one group of signal transmssion line, is realized entire
The communication of fire telephone system.Bus fire telephone is fire telephone more common in current industry, i.e. fire telephone host
Communicated in the form of bus between fire telephone extension set, bus not only as power supply line main, between extension set, but also as master, divide
Signal wire between machine.Audio signal is directly coupled in bus by being converted to voltage signal after a series of conversion, realizes sound
The transmission of frequency signal.This communication mode anti-interference ability of fire telephone is very weak, is had in practice with shielding
Line is as telephone wire, and noise is very big when otherwise signal transmits, and influences the communication quality of fire telephone；Due to uplink and downlink
Signal is capacitively coupled in bus, and signal uplink and downlink are all made of voltage signal mode and transmit, the channel needed
Bandwidth is very big, causes bus carrying load ability very weak, and signal transmission distance is not far, and the efficiency of fire telephone system is very low.
Summary of the invention
The purpose of the present invention is to provide a kind of implementation method of fire telephone system, mainly solve to deposit in the prior art
Fire telephone anti-interference ability it is weak, transmission range is short the problems such as.
To achieve the goals above, The technical solution adopted by the invention is as follows:
A kind of implementation method of fire telephone system, including host calling extension set and call extension host；
Concrete methods of realizing when the host calling extension set, includes the following steps:
(S11) fire telephone host issues inspection order to each fire telephone extension set in real time, when fire telephone host needs
When will be with the fire telephone extension intercom of a certain address, fire telephone host sends calling order to the address；
(S12) call that fire telephone extension set receives fire telephone host generates ring after instructing；
(S13) after fire telephone extension set off-hook, hook-up command is returned to fire telephone host, until fire telephone master
After machine examination measures hook-up command, speaking circuit is opened, starts to converse between fire telephone master, extension set；
(S14) it signals under fire telephone host is by the way of digital modulation, voice signal is sampled, is quantified,
After coding and digital command together, modulated the signal in bus with the coding mode of time interval, fire telephone host is to disappearing
It signals under anti-extension and bus data is sampled in real time；
(S15) fire telephone extension set chooses the low level time section in bus signals, will be converted into current signal
Voice signal is modulated to return fire telephone host in bus；
(S16) when the low level that fire telephone host collects bus temporarily, to be sampled, take its stable electric current
Signal carries out voice restoration processing；
(S17) after fire telephone extension set receives the signal that fire telephone host issues, this signal is demodulated, is passed through
DAC processing reduction voice signal；
(S18) step (S14)~(S17) is repeated after entire end of conversation on-hook, fire telephone Host Shutdown voice
The fire telephone extension address is included in its inspection range again by circuit.
Concrete methods of realizing when the call extension host, includes the following steps:
(S21) fire telephone extension set off-hook is simultaneously instructed with by inspection signal to the transmission request call of fire telephone host；
(S22) after fire telephone host receives the instruction that the request of fire telephone extension set is conversed, ring is generated；
(S23) sound circuit is opened while fire telephone host off-hook, can starts to converse, while fire telephone
Host is to fire telephone extension set transmitting order to lower levels signal and audio digital signals；
(S24) it after fire telephone extension set receives the signal that fire telephone host issues, is chosen while analytic signal
The voice signal for being converted into current signal is loaded onto bus and returns to fire-fighting electricity by the low level time section in signal
Talk about host；
(S25) fire telephone host real-time perfoming bus data while digital signal issues samples, low when collecting
Level temporarily, to be reduced to voice signal after current signal therein is handled；
(S26) it repeats step (S24) and (S25), until in fire telephone system after entire end of conversation on-hook, fire-fighting
The fire telephone extension address is included in its inspection range again by main station.
Further, the interval time in the step (S14) meets 100~125us.
Further, low level meets 8~12v in the step (S15) and (S24), and wherein access time is 30us.
Further, in the step (S13) and (S23) when fire telephone master, extension set start call fire telephone master
The fire telephone extension set of machine still real-time other addresses of inspection.
Further, the voice signal that will convert into current signal in the step (S15) and (S24) is loaded onto bus
The concrete methods of realizing for going up and returning fire telephone host includes fire telephone extension set feedback circuit, the circuit include one end with
Resistance R12 external microcontroller connection and powered by single-chip microcontroller, the resistance R18 that one end is connect with the resistance R12 other end, one
The microphone MICI that end is connect with the resistance R18 other end, the other end is grounded, one end connect with resistance R12 and resistance R18 simultaneously,
The resistance R15 of other end connection, the pressure stream transformer D3A that positive input terminal is connect with the resistance R15 other end, one end and pressure circulate
The derided capacitors C12 that the connection of the 5th pin of parallel operation D3A, the other end are grounded, one end are connect with pressure stream transformer D3A input terminal
Resistance R11, the triode V6 that base stage is connect with the resistance R11 other end, one end connect with pressure stream transformer D3A negative input end, are another
The resistance R8 that one end is connect with triode V6 emitter, one end is connect with pressure stream transformer D3A negative input end, the other end is grounded
Resistance R10, one end and the pressure resistance R19 that connect of stream transformer D3A positive input terminal, output end and negative input end simultaneously with electricity
The follower D3B of R19 other end connection is hindered, one end connect with triode V6 emitter, the other end and follower D3B positive input
The resistance R20 of connection is held, drain the NMOS tube Q1 connecting with follower D3B positive input terminal and one end and NMOS tube Q1 grid
The resistance R22 that pole connection, the other end and telephone signal connect, wherein the 4th pin ground connection of pressure stream transformer D3A, the 5th pin
Single-chip microcontroller power supply is connect, the collector of triode V6 is connect with bus, the source electrode ground connection of NMOS tube Q1；
And the implementation method based on foregoing circuit, include the following steps:
(S31) collected audio signal is converted to the voltage signal of variation by microphone MIC1；
(S32) voltage signal reaches the positive input terminal of pressure stream transformer D3A after resistance R18 and resistance R15；
(S33) voltage signal is after pressure stream transformer D3A is converted to current signal, the collector load through triode V6
Onto bus；
(S34) current signal after triode V6 from emitter output all the way signal as negative-feedback reach pressure circulate
The voltage signal of the negative input end of parallel operation D3A, the current signal and input that make output is linear；
(S35) another way signal reaches the positive input terminal of follower D3B after resistance R20, by current signal and voltage
Signal isolation comes.
(S36) when single-chip microcontroller is to resistance R22 high level, NMOS tube Q1 is opened, when single-chip microcontroller is to R22 low level,
NMOS tube Q1 is closed, while (S31)~(S35) that repeat the above steps, and current signal is loaded into bus.
Specifically, it includes fire telephone host language that fire telephone host, which carries out voice restoration processing, in the step (S16)
Sound telecommunication circuit, the circuit include the input for connecting and exporting low and high level digital waveform with fire telephone extension set by bus
Module is integrated, cathode integrates the diode V8, the resistance R41 that one end is connect with diode V8 anode, that module is connect with input
The isolator D8 that 3 pins are connect with the resistance R41 other end, and the electricity being connect respectively with isolator D8 the 1st and 3 pins after connecting
Hold C23 and resistance R39, one end connect the resistance R36 that the other end is connect with the 5th pin of isolator D8 with 3.3V voltage, and the 8th draws
The current-to-voltage convertor D7 that foot is connect with the 1st pin of isolator D8, one end is drawn with current-to-voltage convertor D7 the 8th after parallel connection
The resistance R34 and capacitor C22 that foot connection, the other end are connect with the 1st pin of current-to-voltage convertor D7 and 12V voltage simultaneously, string
After connection one end connect with the 5th pin of current-to-voltage convertor D7, the resistance R37 and capacitor C24 of another termination -24V voltage, one
End simultaneously connect with resistance R37 and capacitor C24 another termination -24V resistance R38 and one end simultaneously with resistance R37 and electricity
Hold the resistance R35 that C24 connects another termination fire telephone host MCU, wherein mono- termination -24V of capacitor C24, isolator D8's
External circuit board, the 6th pin connect 3.3V voltage at 4th pin ground connection, the 5th pin D, and it includes one end that module is integrated in the input
Resistance R42, the R43 being connect with differential amplifier circuit, the PMOS pipe that grid is connect with the resistance R42 other end, one end and PMOS tube
Source electrode connection, another termination -24V capacitor C25, one end connect with PMOS tube grid, the other end and PMOS tube source electrode connect
Resistance R40, the diode V9 of anode and PMOS tube drain electrode connection, the NMOS tube that grid is connect with the resistance R43 other end, anode
The zener diode D9 connected with NMOS tube drain electrode connection, cathode and diode V9 cathode, what anode was connect with NMOS tube source electrode
Diode V13, one end connect the resistance R52 of another termination -24V with diode V13 cathode, and one end is connect with NMOS tube grid
The resistance R49 of another termination -24V, one end connect the resistance R45 of another termination -24V with diode V9 cathode, wherein two poles
The cathode of pipe V8 is connect with the cathode of zener diode D9, while the negative pole end C point of diode V9 passes through bus and fire telephone
Extension set connection, resistance R42 and differential amplifier circuit tie point are A, and resistance R43 and differential amplifier circuit tie point are B；
And the implementation method based on the circuit, include the following steps:
When A point is high level:
(S41) voltage signal reaches C point, at this time output HIGH voltage 24V through PMOS tube and diode V9；
(S42) voice signal of fire telephone host is modulated on the bus signals of 24V in a manner of digital signal, to
The transmission of fire telephone extension set；
When B point is high level:
(S43) 12V reaches C point after resistance R34, R39, R41 and diode V8；Zener diode D9 will export low electricity
It presses and maintains 10V；
(S44) when the MCU of fire telephone extension set detects the failing edge arrival of bus signals, fire telephone extension set will
The voice signal for being converted into current signal is modulated in bus, as bus is back to fire telephone host；
(S45) MCU of fire telephone host reads the voltage difference at resistance R34 both ends, and signal is through current-to-voltage convertor D7
After converting and amplifying 20 times, through resistance R37, R35, fire telephone host MCU is reached；
(S46) after the low level of signal to be uploaded continues 20 μ s, the voltage at the end fire telephone host MCU sampling resistor R35
Signal takes its stationary signal to carry out voice restoration processing.
Compared with prior art, the invention has the following advantages:
(1) voice is believed during realizing call between fire telephone extension set and fire telephone host of the invention
Number carry out digital modulation after transmitted, the transmission mode of analog signal compared with the existing technology, the present invention using number pass
Defeated mode avoids signal during transmission well and is interfered, influences the generation of the case where speech quality, and uses
The mode of Digital Transmission effectively eliminates echo, so as to avoid jitter during transmission, vulnerable to interference
It happens, is transmitted by way of digital modulation, improve fire telephone master, the communication quality of extension set and opposite
Farther in traditional transmission mode transmission range, reliability is higher.
(2) for the present invention after fire telephone host and fire telephone extension set realize call, fire telephone host is still real-time
Inspection is carried out to the fire telephone extension set of other addresses, so as to avoid when fire telephone host and a wherein fire telephone point
Machine converse and miss with the response between other fire telephone extension sets, to realize comprehensive monitoring, practicability is stronger.
(3) fire telephone extension set voice feedback circuit of the present invention is believed by pressure stream transformer from the voltage of microphone input
The case where number being converted to current signal, can be interfered to avoid the signal of upload, therefore the audio signal uploaded is not deposited
In noise, tone color is clear, at the same the current signal after converting by after triode amplification as the defeated of negative-feedback and another amplifier
Enter signal, and the external bus of triode, pressure stream transformer are connect with single-chip microcontroller, are existed by the NMOS tube connecting with telephone signal
Off state not the electricity on drain bus and to play the role of energy-efficient and of the invention circuit structure simple, using simple
Foundation realize strong antijamming capability, without noise, carrying load ability is strong, long transmission distance and low energy consumption.
(4) fire telephone host voice communications circuit of the present invention connects existing differential amplifier circuit by A, B two o'clock,
To output difference signal, and the voltage of two metal-oxide-semiconductors connection from 24V through 10V to -24V, be respectively formed voltage difference each other,
So that C point has the condition of conducting, and export as the digital signal of complementary waveform, this phone being connect with C point by bus
Extension set signal matches in low level conducting, thus entire circuit realizes low-power consumption.Isolator D8 puts signal simultaneously
Greatly, by D point link circuit plate, the signal in circuit board is amplified through isolator D8, amplified signal is transmitted to electricity
The end R34 is hindered, the MCU of fire telephone host is acquired the signal at resistance R34 end, and the digital wave that the present invention inputs
Shape, therefore anti-interference ability is stronger relative to traditional analog signal transmission anti-interference ability, due to anti-interference ability
By force, it therefore may be implemented to transmit at a distance.
Detailed description of the invention
Fig. 1 is flow chart when host of the present invention calls extension set.
Flow chart when Fig. 2 is call extension host of the present invention.
Fig. 3 is waveform configuration schematic diagram of the present invention.
Fig. 4 is fire telephone extension set voice feedback circuit schematic diagram of the invention.
Fig. 5 is the implementation method flow chart of Fig. 4 of the present invention.
Fig. 6 is fire telephone host voice communications circuit schematic diagram of the invention.
Fig. 7 is the system flow chart in Fig. 6 of the present invention when A point is high level.
Fig. 8 is the system flow chart in Fig. 6 of the present invention when B point is high level.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples, and embodiments of the present invention include but unlimited
In the following example.
Embodiment
As shown in Figures 1 to 8, a kind of implementation method of fire telephone system, including host calling extension set and call extension
Host.
When host calls extension set:
When beginning, fire telephone host issues inspection order to each fire telephone extension set in real time, when fire telephone host
When needing to be conversed with the fire telephone extension set of a certain address, fire telephone host sends calling order to the address.This disappears
The call that anti-extension receives fire telephone host gives a response after instructing, i.e. generation ring is to remind corresponding work
Personnel receive calls.After staff is by fire telephone extension set off-hook, the fire telephone extension set after off-hook is due to fire telephone
Extension set subject for ridicule is separated with base, therefore to fire telephone master after the circuit board detecting to coherent signal inside fire telephone extension set
Machine returns to hook-up command, until opening speaking circuit, fire telephone master, extension set after fire telephone Host Detection to hook-up command
Between start call when.In order to avoid fire telephone host does not omit the case where request of other fire telephone extension sets is conversed, because
This fire telephone host still can in real time other addresses of inspection extension.Photos and sending messages are using number under fire telephone host
The mode of modulation is modulated in bus with digital command to fire-fighting electricity together after being sampled, quantify by voice signal, encoding
Extension set transmission is talked about, causes signal to be interfered when can effectively avoid in the prior art using analog signal transmission, influence to lead to
The case where words quality and generation echo, occurs, and realizes the communication effect of high quality, and fire telephone host issues in bus
The preferred sampling interval duration of digital signal encoding interval mode meet 100~125us, the preferred 8-12V of low level, between the time
Every the signal of preferred 30us.Fire telephone extension set chooses the low level time section in bus signals, will be converted into electric current letter
Number voice signal be modulated in bus return fire telephone host.When the low level that fire telephone host collects bus is come
Temporarily, it is sampled, its stable current signal is taken to carry out voice restoration processing.Fire telephone extension set receives fire telephone
After the digital signal that host issues, this digital signal is demodulated, the voice signal for being reduced to simulation is handled by DAC,
In, the preferred PWM mode of DAC processing.Until after entire end of conversation on-hook, fire telephone Host Shutdown sound circuit again will
The fire telephone extension address is included in its inspection range.
When call extension host:
Extension set subject for ridicule leaves extension set pedestal after fire telephone extension set off-hook, the circuit board detecting being mounted in extension set pedestal
Request call instruction is sent to fire telephone host after leaving extension set pedestal to extension set subject for ridicule and with by inspection signal.Fire-fighting
After main station receives the instruction of fire telephone extension set request call, ring is generated, staff has been reminded to receive calls.
Sound circuit is opened while staff is by fire telephone host-to-host subject for ridicule off-hook, fire telephone can be realized
Call between host and fire telephone extension set.Fire telephone host is at this time in order to avoid missing other fire telephone extension sets
Request is conversed, still the fire telephone extension set of real-time other addresses of inspection.Photos and sending messages use digital modulation under fire telephone host
Mode, i.e., be modulated in bus together with digital command to fire telephone after being sampled, quantify by voice signal, encoding
Extension set transmission, the audio digital signals encoded interval mode preferred time that wherein fire telephone host issues in bus is
125us, the signal of the preferred 8-12V of low level and time preferred 30us.Fire telephone extension set receives under fire telephone host
After the digital signal of hair, while parsing digital signal, choose digital signal in 30us low level time section, by by
The voice signal for being converted into current signal is loaded onto return fire telephone host in bus and converses, to realize high-quality
The call of amount, and digital data transmission is used, it is stronger apart from farther and anti-interference ability relative to analog signal transmission.Disappear
Anti- main station real-time perfoming bus data while digital signal issues samples, and comes temporarily when collecting 30us low level,
It is reduced to the voice signal of simulation after current signal therein is handled, is interfered to avoid signal.Until fire-fighting electricity
In telephone system after entire end of conversation on-hook, the extension by the address is included in its inspection range to main station again.
Wherein, when fire telephone extension set is to fire telephone host return path signal, when Q1 input low level, single-chip microcontroller
For microphone MIC1 power supply, the output voltage of usual single-chip microcontroller is 3.3V, exports the voltage of 3.3V into reaching after resistance R12 partial pressure
To A point voltage in 3V hereinafter, audio signal from microphone MIC1 acquisition enter pressure stream transformer D3A positive input terminal, warp
The pressure stream transformer D3A of comparator-type is exported to triode V6, is inputted at this time from the positive input terminal of pressure stream transformer D3A
Voltage signal is converted to current signal, and the current signal for reaching triode V6 is 0~20mA, current signal a part of conversion
Enter pressure stream transformer D3A through resistance R8 by negative-feedback to carry out continuing to compare, then a part is changed by being similarly pressure circulation
The follower D3B output of device enters pressure stream transformer D3A, wherein follower D3B has carried out voltage and current signal point
Every the current signal then exported is transmitted in bus eventually by the collector for three adapter tube V6 connecting with bus.And it should
Feedback circuit exists when the end resistance R22 has telephone signal to come in and input signal is low level, and NMOS tube Q1 is connected at this time,
The circuit for being located at Q1 drain electrode end after NMOS tube Q1 conducting just works, and what it is when Q1 output is high level, at this time the electricity of Q1 drain electrode end
Road does not work.
It is when carrying out transmitting voice signal between fire telephone master, extension set, fire-fighting electricity ring host is receiving fire telephone point
Machine upload voice signal when, fire telephone host to receive voice signal carry out reduction treatment, have method be when and A
When the differential amplifier circuit (existing custom circuit) of connection exports high level, A point is high level at this time, thus through resistance R42 with
Connection PMOS tube it is (NMOS tube cut-off) in the conductive state, the low and high level positioned at PMOS tube both ends is high level respectively
24V, low level (at C point) 10V, so exporting high level 24V voltage at this time, the voice signal of fire telephone host is with number
The mode of signal is modulated on the bus signals of 24V, and the mutual transmission of digital signal is realized with fire telephone extension set.
When the differential amplifier circuit that connect with B exports high level, B point is high level at this time, thus through resistance R43 with
Connection NMOS tube it is (PMOS tube cut-off) in the conductive state, the low and high level positioned at NMOS tube both ends is high level respectively
10V, low level -24V, so the output voltage of NMOS tube at this time is 10V, and the 12V voltage connecting with resistance R34 one end
The C point connecting with fire telephone extension set bus is reached after resistance R34, R39, R41, diode V8, due to the height electricity of NMOS tube
Flush end is connected with zener diode D9, therefore maintains 10V, therefore the voltage exported from C point always from the voltage that C-terminal exports
For the complementary waveform signal of 10V to 24V.And the 10V being arranged and -24V voltage are to allow the both ends of two metal-oxide-semiconductors to form pressure
Difference, to have the condition of conducting.
The 5th pin of the follower D8 of setting is connected with the circuit board of fire telephone host, while follower D8 is by
On capacitor C23 and resistance R39, the 5th pin of current-to-voltage convertor D7 is passed through for load after the signal of 5 feet input amplifies
It is connect after resistance R37, R35 with the MCU of fire telephone host, returns electricity in the fire telephone extension set voice of the applicant's application
It is mentioned in road, fire telephone extension set only works in low level, therefore when the MCU of fire telephone extension set detects bus signals
When failing edge arrives, the voice signal for being converted into current signal is modulated in bus by fire telephone extension set, passes through fire-fighting
Bus between main station and fire telephone extension set is back to fire telephone host side, and the MCU of fire telephone host is read
The voltage difference at resistance R34 both ends, when there are voltage difference, current signal, which is converted to voltage through current-to-voltage convertor D7, to be believed
Number, and by software debugging, so that signal is amplified 20 times, amplified voltage signal is sent to by resistance R37, R35 to disappear
The MCU of anti-main station, the MCU of fire telephone host after return path signal continues 20 μ s of low level, fire telephone host
The stable voltage signal that MCU will acquire carries out voice restoration processing, obtains the voice signal of strong antijamming capability.
Above-described embodiment is merely a preferred embodiment of the present invention, and it is not intended to limit the protection scope of the present invention, as long as using
Design principle of the invention, and the non-creative variation worked and made is carried out on this basis, it should belong to of the invention
Within protection scope.
Claims (6)
1. a kind of implementation method of fire telephone system, which is characterized in that call extension set and call extension host including host；
Concrete methods of realizing when the host calling extension set, includes the following steps:
(S11) fire telephone host issues inspection order to each fire telephone extension set in real time, when fire telephone host need with
When the fire telephone extension intercom of a certain address, fire telephone host sends calling order to the address；
(S12) call that fire telephone extension set receives fire telephone host generates ring after instructing；
(S13) after fire telephone extension set off-hook, hook-up command is returned to fire telephone host, until fire telephone Host Detection
To after hook-up command, speaking circuit is opened, starts to converse between fire telephone master, extension set；
(S14) it signals under fire telephone host is by the way of digital modulation, voice signal is sampled, quantify, is encoded
Afterwards together with digital command, it is modulated the signal in bus with the coding mode of time interval, fire telephone host is electric to fire-fighting
It signals under words extension set and bus data is sampled in real time；
(S15) fire telephone extension set chooses the low level time section in bus signals, will be converted into the voice of current signal
Fire telephone host is returned in signal modulation to bus；
(S16) when the low level that fire telephone host collects bus is come interim, sampled, take its stable current signal into
The processing of row voice restoration；
(S17) after fire telephone extension set receives the signal that fire telephone host issues, this signal is demodulated, at DAC
Reason reduction voice signal；
(S18) step (S14)~(S17) is repeated after entire end of conversation on-hook, fire telephone Host Shutdown sound circuit,
Again the fire telephone extension address is included in its inspection range.
Concrete methods of realizing when the call extension host, includes the following steps:
(S21) fire telephone extension set off-hook is simultaneously instructed with by inspection signal to the transmission request call of fire telephone host；
(S22) after fire telephone host receives the instruction that the request of fire telephone extension set is conversed, ring is generated；
(S23) sound circuit is opened while fire telephone host off-hook, can start to converse, at the same fire telephone host to
Fire telephone extension set transmitting order to lower levels signal and audio digital signals；
(S24) after fire telephone extension set receives the signal that fire telephone host issues, signal is chosen while analytic signal
In low level time section, the voice signal for being converted into current signal is loaded onto bus and returns to fire telephone master
Machine；
(S25) fire telephone host real-time perfoming bus data while digital signal issues samples, when collecting low level
Temporarily, to be reduced to voice signal after current signal therein is handled；
(S26) it repeats step (S24) and (S25), until in fire telephone system after entire end of conversation on-hook, fire telephone master
The fire telephone extension address is included in its inspection range again by machine.
2. a kind of implementation method of fire telephone system according to claim 1, which is characterized in that the step (S14)
In interval time meet 100~125us.
3. a kind of implementation method of fire telephone system according to claim 1, which is characterized in that the step (S15)
Low level meets 8~12v in (S24), and wherein access time is 30us.
4. a kind of implementation method of fire telephone system according to claim 1, which is characterized in that the step (S13)
In (S23) when fire telephone master, extension set start call fire telephone host still real-time other addresses of inspection fire-fighting electricity
Talk about extension set.
5. a kind of implementation method of fire telephone system according to claim 1, which is characterized in that the step (S15)
The voice signal that will convert into current signal in (S24) is loaded onto the specific implementation side in bus and returning to fire telephone host
Method includes fire telephone extension set feedback circuit, which includes the electricity that one end connect with external microcontroller and powered by single-chip microcontroller
Hinder R12, the resistance R18 that one end is connect with the resistance R12 other end, the wheat that one end is connect with the resistance R18 other end, the other end is grounded
Gram wind MICI, one end connect with resistance R12 and resistance R18 simultaneously, the resistance R15 of other end connection, positive input terminal and resistance R15
The other end connection pressure stream transformer D3A, one end with pressure the 5th pin of stream transformer D3A connect, the other end be grounded derided capacitors
C12, resistance R11, the triode V6 that base stage is connect with the resistance R11 other end that one end is connect with pressure stream transformer D3A input terminal,
One end with pressure stream transformer D3A negative input end connect, the other end and triode V6 emitter connection resistance R8, one end and pressure stream
The resistance R10 that the connection of converter D3A negative input end, the other end are grounded, the electricity that one end is connect with pressure stream transformer D3A positive input terminal
Hinder R19, the follower D3B that output end is connect with the resistance R19 other end simultaneously with negative input end, one end and triode V6 emitter
The resistance R20 that connection, the other end and follower D3B positive input terminal connect, drain the NMOS connecting with follower D3B positive input terminal
The resistance R22 that pipe Q1 and one end are connect with NMOS tube Q1 grid, the other end and telephone signal connect, wherein pressure stream transformer
The 4th pin ground connection of D3A, the 5th pin connect single-chip microcontroller power supply, and the collector of triode V6 is connect with bus, the source of NMOS tube Q1
Pole ground connection；
And the implementation method based on foregoing circuit, include the following steps:
(S31) collected audio signal is converted to the voltage signal of variation by microphone MIC1；
(S32) voltage signal reaches the positive input terminal of pressure stream transformer D3A after resistance R18 and resistance R15；
(S33) for voltage signal after pressure stream transformer D3A is converted to current signal, the collector through triode V6 is loaded into bus
On；
(S34) current signal after triode V6 from emitter output all the way signal as negative-feedback reach press stream transformer
The voltage signal of the negative input end of D3A, the current signal and input that make output is linear；
(S35) another way signal reaches the positive input terminal of follower D3B after resistance R20, by current signal and voltage signal
Keep apart；
(S36) when single-chip microcontroller is to resistance R22 high level, NMOS tube Q1 is opened, when single-chip microcontroller is to R22 low level, NMOS tube
Q1 is closed, while (S31)~(S35) that repeat the above steps, and current signal is loaded into bus.
6. a kind of implementation method of fire telephone system according to claim 1, which is characterized in that the step (S16)
It includes fire telephone host voice communications circuit that middle fire telephone host, which carries out voice restoration processing, which includes passing through bus
It is connect with fire telephone extension set and module is integrated in the input for exporting low and high level digital waveform, cathode is integrated module with input and connect
Diode V8, the resistance R41 that one end is connect with diode V8 anode, the isolator that the 3rd pin is connect with the resistance R41 other end
D8, and the capacitor C23 and resistance R39 connecting respectively with isolator D8 the 1st and 3 pins after connecting, one end is connect with 3.3V voltage
The resistance R36 that the other end is connect with the 5th pin of isolator D8, the Current Voltage that the 8th pin is connect with the 1st pin of isolator D8 turn
Parallel operation D7, it is in parallel after one end connect with the 8th pin of current-to-voltage convertor D7, the other end simultaneously with current-to-voltage convertor D7 the
The resistance R34 and capacitor C22 that 1 pin is connected with 12V voltage, after series connection one end connect with the 5th pin of current-to-voltage convertor D7,
The resistance R37 and capacitor C24 of another termination -24V voltage, one end connect another termination -24V with resistance R37 and capacitor C24 simultaneously
Resistance R38 and one end simultaneously connect with resistance R37 and capacitor C24 it is another termination fire telephone host MCU resistance R35,
Wherein, the 4th pin of mono- termination -24V of capacitor C24, isolator D8 are grounded, external circuit board, the 6th pin connect at the 5th pin D
3.3V voltage, it includes resistance R42, R43 that one end is connect with differential amplifier circuit, grid and resistance that module is integrated in the input
The PMOS tube of R42 other end connection, one end connect with PMOS tube source electrode, the capacitor C25 of another termination -24V, one end and PMOS tube
The resistance R40 that grid connection, the other end and PMOS tube source electrode connect, the diode V9 of anode and PMOS tube drain electrode connection, grid
The NMOS tube being connect with the resistance R43 other end, anode and NMOS tube drain electrode connection, the pressure stabilizing of cathode and the connection of diode V9 cathode
Diode D9, the diode V13 that anode is connect with NMOS tube source electrode, one end connect another termination -24V with diode V13 cathode
Resistance R52, one end connect the resistance R49 of another termination -24V with NMOS tube grid, and one end is connect separately with diode V9 cathode
The resistance R45 of one termination -24V, wherein the cathode of diode V8 is connect with the cathode of zener diode D9, while diode V9
Negative pole end C point connect with fire telephone extension set by bus, resistance R42 is A, resistance R43 with differential amplifier circuit tie point
It is B with differential amplifier circuit tie point；
And the implementation method based on the circuit, include the following steps:
When A point is high level:
(S41) voltage signal reaches C point, at this time output HIGH voltage 24V through PMOS tube and diode V9；
(S42) voice signal of fire telephone host is modulated on the bus signals of 24V in a manner of digital signal, to fire-fighting electricity
Talk about extension set transmission；
When B point is high level:
(S43) 12V reaches C point after resistance R34, R39, R41 and diode V8；Zener diode D9 will export low-voltage and tie up
It holds in 10V；
(S44) when the MCU of fire telephone extension set detects the failing edge arrival of bus signals, fire telephone extension set will be turned
The voice signal for changing current signal into is modulated in bus, as bus is back to fire telephone host；
(S45) MCU of fire telephone host reads the voltage difference at resistance R34 both ends, and signal is converted through current-to-voltage convertor D7
And after amplifying 20 times, through resistance R37, R35, fire telephone host MCU is reached；
(S46) after the low level of signal to be uploaded continues 20 μ s, the voltage signal at the end fire telephone host MCU sampling resistor R35,
Its stationary signal is taken to carry out voice restoration processing.
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