CN101894441B - Fire detection system - Google Patents
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- CN101894441B CN101894441B CN 201010170247 CN201010170247A CN101894441B CN 101894441 B CN101894441 B CN 101894441B CN 201010170247 CN201010170247 CN 201010170247 CN 201010170247 A CN201010170247 A CN 201010170247A CN 101894441 B CN101894441 B CN 101894441B
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Abstract
The invention provides a fire detection system which comprises an alarm device, a sounder and a receiver, wherein the alarm device is used for detecting abnormal phenomena in a monitored area; the sounder gives out an alarm sound to inform the abnormal phenomena in the monitored area; the receiver is connected with the alarm device and the sounder; when detecting an abnormal phenomenon in the monitored area, the alarm device sends out a fire signal to the receiver; when receiving the fire signal from the alarm device, the receiver gives out an alarm sound to send out a signal to the sounder; and when receiving the signal sent out by the alarm sound from the receiver, the sounder determines the alarm sound tone according to the signal sent out by the alarm sound and gives the alarm sound with the determined tone according to the signal sent out by the alarm sound. The invention can generate an alarm sound according to the output signal of the alarm device, and especially can give out an alarm sound with high efficiency.
Description
The present invention for the applying date be that May 10, application number in 2005 are 200580049697.0, denomination of invention divides an application for the application for a patent for invention of " acoustical generator ".
Technical field
The present invention relates to a kind of acoustical generator that is arranged on the alarm device; When alarm device detects the generation of abnormal occurrence (for example fire) and exports alarm signal; The acoustical generator sound that can give the alarm according to the alarm signal of alarm device output is with the generation of circular abnormal occurrence.
Background technology
In order to let buildings and people's life avoid the threat of fire, a kind of effective method is exactly fire detector to be installed be used for responding to the generation at intensity of a fire initial stage, and gives the alarm.In order to reach this purpose, when fire detector when the monitor area of installing detects the intensity of a fire, fire detector can be exported an alarm signal to trigger alarm bell or the alert speaker sound that gives the alarm, so with the generation of circular fire.
Yet, in buildings with height acoustic isolation effect, hotel for example, even when the alarm bell that is installed on passage sounds, the guest in the room still can't hear alarm sound easily.In order to address this problem, a kind of can be directly and the fire detector in the room be installed together, and produce the acoustical generator (pedestal acoustical generator) of alarm song according to the alarm signal of fire detector output, begin by practical application.For instance, the U.S. 6,362; No. 726 patents disclose a kind of pedestal acoustical generator that can be set together with fire alarm system; According to the design of this pedestal acoustical generator, alarm song can result from the room of fire detector installation, therefore can reach safer and clear and definite fire caution effect.
The structure of above-mentioned traditional pedestal acoustical generator such as following explanation.Figure 17 one is installed on the vertical cross section of traditional pedestal acoustical generator on ceiling surface.Shown in figure 17, traditional pedestal acoustical generator 100 is arranged at ceiling surface 102 through a mounting base 101.And fire detector 103 is the lower ends that are connected in pedestal acoustical generator 100.Electronic package such as circuit support plate 104 are the inside that is arranged at pedestal acoustical generator 100 with piezoelectric element 105.Pedestal acoustical generator 100 is to utilize piezoelectric element 105 to produce alarm sound and play back.
The output control of tradition pedestal acoustical generator will be like following explanation.Generally speaking, traditional pedestal acoustical generator be through apply a pulse signal in piezoelectric element 105 so that piezoelectric element 105 sound the alarm.Specifically, in traditional approach, a plurality of metal oxide semiconductcor field effect transistors (not icon) are combined into full bridge driving circuit, be used for producing have fixed pulse width pulse signal to put on piezoelectric element 105.
Alarm sound has different volumes and tone according to the kind of alarm with degree sometimes.For instance, when a plurality of fire detectors were electrically connected, the fire detector of sensing the intensity of a fire sent the alarm song than high-pitched tone, and other fire detector of not sensing the intensity of a fire then sends the alarm song than low pitch.In order to send the alarm song of different tones, traditional pedestal acoustical generator only changes the amplitude and the frequency of the pulse signal that puts on piezoelectric element 105 simply.
Summary of the invention
Problem to be solved by this invention
Yet traditional pedestal acoustical generator only changes the amplitude and the frequency of the pulse signal that puts on piezoelectric element 105 simply, and does not have the pulsewidth (pulse width) of control wave, and the output efficiency of alarm song is step-down therefore.In other words, the wave volume of the alarm song that piezoelectric element 105 sends (acoustic pressure) can be according to putting on the amplitude of the pulse signal of piezoelectric element 105, frequency, and pulsewidth and changing.Yet, on traditional approach, have only the amplitude of pulse signal and frequency to be changed, the pulsewidth of pulse signal is not optimized with further increase acoustic pressure.Relative, the output efficiency of alarm song has just reduced.When only increasing amplitude, acoustic pressure can increase, but also increase relatively of current drain, and the output efficiency of alarm song is reduced.
The present invention be directed to the problem of above-mentioned viewpoint and produce, and a kind of acoustical generator is provided, increase the output efficiency of alarm song in piezoelectric element through applying suitable pulse signal according to various situation.
Technical scheme of the present invention
The present invention provides a kind of fire detection system, and it comprises: alarm device, its detection be subjected to supervision the zone in abnormal occurrence; Acoustical generator, it sounds the alarm and in this monitor area, abnormal occurrence takes place with circular; And receiving trap; It connects this alarm device and this acoustical generator; Wherein detect in this monitor area when abnormal occurrence takes place when this alarm device, this alarm device sends fire signal to this receiving trap, when this receiving trap receives the fire signal from this alarm device; This receiving trap sounds the alarm and issues a signal to this acoustical generator; When this acoustical generator receives alarm song from this receiving trap when sending signal, this acoustical generator sends signal deciding alarm song tone according to this alarm song, and sends the alarm song that signal sends the tone that is determined according to this alarm song.
Effect of the present invention
Acoustical generator of the present invention can provide the pulse signal with proper frequency and pulsewidth to sonic source device, thereby improves the phonation efficiency of sonic source device.
Acoustical generator of the present invention can be arranged in pairs or groups a specific pulsewidth exporting alarm song expeditiously according to a demand frequency, thereby improves the phonation efficiency of sonic source device.
Acoustical generator of the present invention also can be through reducing duty of ratio (duty ratio) to 50% current drain with the attenuating sonic source device.Therefore, sonic source device can drive under battery saving mode, further improves phonation efficiency.
Description of drawings
Fig. 1 is the synoptic diagram of assemblies such as pedestal acoustical generator and the fire detector of first embodiment of the invention;
Fig. 2 is the pedestal acoustical generator shown in Figure 1 and the exploded perspective view of other associated component;
Fig. 3 is the enlarged diagram that mounting base is seen from lower to upper;
Fig. 4 is the enlarged diagram that mounting base is seen from top to bottom;
Fig. 5 is the enlarged diagram that the pedestal acoustical generator is seen from lower to upper;
Fig. 6 is the enlarged diagram that the pedestal acoustical generator is seen from top to bottom;
Fig. 7 is the exploded perspective view of pedestal acoustical generator;
Fig. 8 is the enlarged diagram that the acoustical generator body is seen from top to bottom;
Fig. 9 is the exploded perspective view of acoustical generator body shown in Figure 8;
Figure 10 is the pedestal acoustical generator, the vertical cross section of mounting base and fire detector;
Figure 11 is the upward view of Fig. 7 base seat lid;
Figure 12 is the synoptic diagram that fire detector is seen from top to bottom;
Figure 13 is the fire detection system electric wiring plan of (comprising the pedestal acoustical generator);
Figure 14 is the block schematic diagram of the circuit design of pedestal acoustical generator;
Figure 15 is the synoptic diagram of pulse signal, and what wherein (a) showed is the pulse signal of the embodiment of the invention, and what (b) show is traditional pulse signal;
Figure 16 is the pulsewidth of pulse signal under CF and between the current value of pulse signal that puts on piezoelectric element, and and the acoustic pressure of the alarm song that sends of piezoelectric element between graph of a relation; And
Figure 17 one is installed on the vertical cross section of traditional pedestal acoustical generator on ceiling surface.
Embodiment
The embodiment of the invention such as following explanation, each embodiment provides a kind of acoustical generator, and this acoustical generator is to be connected in the alarm device that is used in monitor area induction abnormal occurrence.The acoustical generator of each embodiment is used for sounding the alarm according to the signal of alarm device output; When alarm device detects abnormal occurrence; The acoustical generator of the embodiment of the invention (below be called the pedestal acoustical generator) receives the signal of alarm device output, and sounds the alarm.
Alarm device can detect different objects according to different testing goals.For instance, fire detector is used for detecting burning things which may cause a fire disaster, and gas indicator is used for detecting gas leakage, and the fire of combined type and gas indicator are used for detecting simultaneously burning things which may cause a fire disaster and two kinds of objects of methane gas.
The pedestal acoustical generator of present embodiment can be installed on different installation surface, for example ceiling or metope.The pedestal acoustical generator can be controlled sound source to export the alarm song of various tones.Especially the principal character of pedestal acoustical generator is the control system that is its sound source.Under above-mentioned design, the pedestal acoustical generator can be exported the alarm song of each tone expeditiously.In other words, the output acoustic pressure can be through improving the frequency of pulse signal and the optimization that concerns of pulsewidth for the ratio of current drain.
At first, each assembly of the embodiment of the invention will be like following explanation.Fig. 1 is the synoptic diagram of assemblies such as pedestal acoustical generator and the fire detector of the embodiment of the invention.Fig. 2 is the pedestal acoustical generator of Fig. 1 and the exploded perspective view of other associated component.As shown in the figure, a mounting base 10 is fixed on 1 (also being installation surface) of ceiling surface, and a pedestal acoustical generator 20 is installed in the lower end of mounting base 10.30 of one fire detectors are the lower ends that is connected in pedestal acoustical generator 20.In other words, pedestal acoustical generator 20 is as sandwich, to be sandwiched between mounting base 10 and the fire detector 30.In the present embodiment, explain for ease, towards ceiling near direction be up, towards ceiling away from direction be down.When other surface is used to replace ceiling to be used as installation surface, up be towards installation surface near direction, down be towards installation surface away from direction.
Fig. 3 is the enlarged diagram that mounting base is seen from lower to upper.Mounting base 10 is intimate circular dish shape things.When screw 11a was inserted into screw hole 11 and locks ceiling surface 1, mounting base 10 can be fixed on the ceiling surface 1.The lead 2 that passes from ceiling surface 1 can pass circuit hole 12 easily, and is pulled to base end connector 13.Base end connector 13 is power supplys that an electric connection unit is used for receiving lead 2 supplies; And input or output signal to pedestal acoustical generator 20 or fire detector 30; And being used to provide between mounting base 10 and the pedestal acoustical generator 20, or the structural connection between mounting base 10 and the fire detector 30.Specifically, the device end of the pedestal acoustical generator 20 that can discuss after a while output connector 23, its sheet metal 23a can be held on the centre by sheet metal 13a and 13b, so that pedestal acoustical generator 20 is connected in mounting base 10 in structure with electrically.Similarly; Utilize above-mentioned sheet metal 13a, the method for clamping of 13b, the alarm device end connector 32 of the fire detector 30 that can discuss after a while; Its sheet metal 32a also can be held on the centre by sheet metal 13a and 13b, so that fire detector 30 is connected in mounting base 10 in structure with electrically.The 1 lead 2 terminal heart yearns that pass are fixed on the mounting base 10 by a screw 13f from ceiling surface, and and then are electrically connected on base end connector 13.
Next pedestal acoustical generator 20 will be described.Fig. 5 is the enlarged diagram that the pedestal acoustical generator is seen from lower to upper, and Fig. 6 is the enlarged diagram that the pedestal acoustical generator is seen from top to bottom.As shown in the figure, pedestal acoustical generator 20 comprises a base seat lid 21 and an acoustical generator body 22 haply.
In above-mentioned, base seat lid 21 is used for hiding mounting base 10, improving outward appearance and sound property, and prevents dust and avoids mounting base 10 to be exposed to the outside.Device end output connector 23 is to be arranged at above the base seat lid 21; Each device end output connector 23 all is that an electric connection unit is used for receiving the power supply from mounting base 10; And be used for exporting signal and input signal to mounting base 10 from mounting base 10.Device end output connector 23 also is a structure linkage unit, is used on structure, connecting pedestal acoustical generator 20 in mounting base 10.Specifically, in the middle of the sheet metal 23a through device end output connector 23 is held on by the sheet metal 13a of Fig. 3 base end connector 13 and 13b, pedestal acoustical generator 20 can so that in structure with electrical on be connected in mounting base 10.
Next acoustical generator body 22 will be described.Fig. 8 is the enlarged diagram that the acoustical generator body is seen from top to bottom, and Fig. 9 is the exploded perspective view of Fig. 8 acoustical generator body, and Figure 10 is the pedestal acoustical generator, the vertical cross section of mounting base and fire detector.Acoustical generator body 22 has comprised pedestal acoustical generator 20 main electronics and mechanism assembly.It should be noted that circuit support plate 26 is to be placed in the acoustical generator body 22.The electronic package of pedestal acoustical generator 20, for example central control unit and power control unit (not icon) are to be arranged on the circuit support plate 26.The piezoelectric element 27 of the sound of being used for giving the alarm is to be arranged near the center on the plane above the acoustical generator body 22.Piezoelectric element 27 is electrically connected on circuit support plate 26.When applying a voltage to piezoelectric element 27, piezoelectric element 27 can be to expand and to shrink and and then generation alarm song.
Please again with reference to figure 5 and Fig. 7, second device end output connector 28 is the lower surfaces that are positioned at acoustical generator body 22.Second device end output connector 28 is that an electric connection unit is used for power supply to fire detector 30, and is used for exporting signal and input signal to the fire detector 30 from fire detector 30.Second device end output connector 28 also is a structure linkage unit, is used on structure, connecting acoustical generator body 22 in fire detector 30.The position and the shape of second device end output connector 28 of acoustical generator body 22 are position and the shapes that are similar to the base end connector 13 of mounting base 10.Form the sheet metal 28a of second device end output connector 28,28b is fixed by screw 28c.The detector end connector 32 that can discuss after a while, its sheet metal 32a can be held on the centre by sheet metal 28a and 28b, so that fire detector 30 is connected in pedestal acoustical generator 20 in structure with electrically.
Next locked mechanism between said base lid 21 and the acoustical generator body 22 is discussed.Figure 11 is the upward view of Fig. 7 base seat lid.Shown in figure 11, the locking hole 21a of a plurality of hollow cylindricals towards the acoustical generator body, 21b is the lower surface that is arranged at base seat lid 21.Locking hole 21a partly is used for when making, helping the location, and can be used as suction eye ceiling being dripped and amass in the water of base seat lid 21 and extract out, and can insert the releasing locked mechanism that is used for removing and installing pedestal.
The circuit design of pedestal acoustical generator 20 such as following explanation.Figure 13 is the fire detection system electric wiring plan of (comprising the pedestal acoustical generator).In the first half of Figure 13, a monitor area is provided with mounting base 10, pedestal acoustical generator 20, and fire detector 30 (mounting base 10, pedestal acoustical generator 20, and fire detector 30 can close be called end device 40).Each end device 40 is electrically connected mutually through lead 2.TU Trunk Unit 4 and receiving trap 5 are to be electrically connected between the end device 40.The enlarged drawing of the end device 40 shown in Figure 13 Lower Half, outer lock fixing apparatus 6 (for example pilot lamp) outdoors is the remote control end points 14 that is electrically connected on mounting base 10.
Next the fire reporting chain is described.The fire detector 30 of each end device 40 all has an address.During in the early stage default, the pedestal acoustical generator 20 of each end device 40 still is furnished with the address of an address corresponding to fire detector 30.According to above-mentioned arrangement, the corresponding fire detector 30 of address interconnect can be electrically connected with pedestal acoustical generator 20.Specifically, when starting in the early stage, receiving trap 5 transmit comprise the address control signal to fire detector 30.Fire detector 30 is passed its address to receiving trap 5 back after receiving control signal.Transmit another address (preset number adds the address of fire detector 30) to pedestal acoustical generator 20 after the receiving trap 5.Pedestal acoustical generator 20 upgrades itself address according to the address that receives after receiving this address, and then the address of automatically matching fire detector 30 and pedestal acoustical generator 20.
After address setting is accomplished,, restore when the needs test; Or control is during alarm device; Receiving trap 5 transmits a command signal to leads 2, and command signal comprises the address of wanting controlled fire detector 30 and pedestal acoustical generator 20, and order the content that will carry out.Fire detector 30 can judge whether the address in the command signal meets the address of self after receiving command signal with pedestal acoustical generator 20.When the address in the command signal meets the address of self, the execution content of being ordered in fire detector 30 and the pedestal acoustical generator 20 meeting fill order signals.
When any fire detector 30 is sensed the intensity of a fire; Fire detector 30 can comprise fire alarm to the lead 2 of self address through interrupt routine output one; Through exporting lead 2 to behind pedestal acoustical generator 20 and the mounting base 10, receiving trap 5 receives fire alarm to fire alarm subsequently in regular turn.Receiving trap 5 picks out the address of the pedestal acoustical generator 20 that is connected in fire detector 30 according to the address of fire detector in the fire alarm, and export one comprise above-mentioned address alarm song output signal to lead 2.
After the pedestal acoustical generator 20 of each end device 40 receives the alarm acoustic output signal, can judge whether the address in the alarm acoustic output signal meets the address of self.When the address in the alarm acoustic output signal met the address of pedestal acoustical generator 20 self, pedestal acoustical generator 20 can judge with the fire detector 30 of its electrical connection and sense the intensity of a fire, and exported the alarm song (below be called the burning things which may cause a fire disaster alarm song) of a preset tones.On the other hand, the alarm song that near other pedestal acoustical generator 20 can another preset tones of output (below be called related alarm song).Under above-mentioned situation, alarm song output signal comprises a control command and is used for optionally controlling the tone of alarm song, and each pedestal acoustical generator 20 then sends the alarm song of the tone of control command appointment.The tone of burning things which may cause a fire disaster alarm song is higher than the tone of related alarm song.When fire detector 30 transmitted fire alarm to receiving traps 5, receiving trap 5 remote controls exported the signal of fire detector 30 to, and and then controlled the outer lock fixing apparatus 6 that is electrically connected on fire detector 30 (for example a pilot lamp) outdoors.
Next will further specify the circuit design of said base acoustical generator 20.Figure 14 is the block schematic diagram of the circuit design of pedestal acoustical generator 20.Shown in figure 14, in the acoustical generator body 20 of pedestal acoustical generator 20, be provided with a power circuit 29a; One transmits interface circuit 29b; One central control circuit 29c, a voltage (volume) control circuit 29d, a monitoring circuit 29e; And one drive circuit 29f, also comprise above-mentioned piezoelectric element 27 in addition.
More than in the explanation, power circuit 29a is a voltage source of supply, and it provides the high voltage that is used for driving piezoelectric element 27 of power supply unit output, and the low-voltage that is used for doing signal Processing.Power circuit 29a has the Current Control function with the inhibition burst current, and the noise barriers function is to reduce noise.
Transmitting interface circuit 29b is a signaling interface; Its change in voltage that is used for from lead 2 is obtained pulse signal; Obtain the operation signal of fire detector from remote control end points 14; And transmit above-mentioned signal, and transmit signal to the lead 2 that central control circuit 29c sends with the form of electric current to central control circuit 29c.
Voltage (volume) control circuit 29d is an exchange type power adjuster (direct current is to direct current transducer), is used for controlling the PWM voltage of signals that central control circuit 29c transmits.In other words, voltage (volume) control circuit 29d can make it become the pattern that step-down cuts the ripple adjuster through step-down PWM mode, and then reduces the volume of the alarm song of piezoelectric element 27, and reduces the current drain of piezoelectric element 27.On the other hand, voltage (volume) control circuit 29d can make its pattern that becomes boost converter through the PWM mode of boosting, and then the volume of the alarm song of rising piezoelectric element 27.
Whether the load that monitoring circuit 29e is used for keeping watch on driving circuit 29f and piezoelectric element 27 is applied in a specific voltage, and the pulse current of monitor flows to above-mentioned load.Specifically, monitoring circuit 29e reads voltage and the pulse current that puts in the load, and the response characteristic when keeping watch on impedance and driving frequency, and then judges whether piezoelectric element 27 sounds constantly.
The control of pulse signal and put on the situation such as the following explanation of piezoelectric element 27.Figure 15 describes a pulse signal.Shown in Figure 15 (a), the pulse signal that puts on piezoelectric element 27 all has the identical waveform of pulsewidth in positive and negative two ends, and also therefore current potential neutralizes mutually and do not produce electric current.Pulse signal has specific frequency and pulsewidth through modulation in central control circuit 29c, and is input to driving circuit 29f.Produce and be supplied in the voltage of driving circuit 29f through voltage (volume) control circuit 29d, be applied in piezoelectric element 27 after specific frequency and pulsewidth are arranged having.
That is to say that central control circuit 29c analyzes the control command from the alarm acoustic output signal that receiving trap 5 transmits, and the frequency of selected pulse signal (driving frequency), so that alarm acoustic energy has the tone corresponding to control command.For instance, the selected upper frequency of central control circuit 29c is sending the burning things which may cause a fire disaster alarm song, and a selected lower frequency is to send related alarm song.The selected of frequency is to decide according to the various preset in advance pairing frequencies of situation.Alarm song also can be the Quiver of Fast transforms between two kinds of frequencies.
When piezoelectric element 27 drove under selected frequency, central control circuit 29c also determined the pulsewidth (the following pulsewidth that will determine by the way is called best pulsewidth) of pulse signal so that piezoelectric element 27 can sound the alarm under top efficiency (making the ratio of output acoustic pressure and current drain is maximal value).Specifically; Pulse signal has different best pulsewidths under various frequencies; The best pulsewidth of each frequency is tried to achieve according to theoretical and experimental data, and the data of best pulsewidth are stored in the software matrix of central control circuit 29c, put down in writing the pairing best pulsewidth of each frequency.After the frequency of selected pulse signal, central control circuit 29c finds out the best pulsewidth corresponding to this frequency according to tabulation, and produces the pulse signal with this frequency and its best pulsewidth, and exports this pulse signal to driving circuit 29f.In other words, in embodiments of the present invention, central control circuit 29c and driving circuit 29f are corresponding to the pulse signal applying unit in the claim, and central control circuit 29c is corresponding to the storage unit in the claim.
The relation of frequency and pulsewidth will be like following explanation.Figure 16 is the pulsewidth of pulse signal under CF and between the current value of pulse signal that puts on piezoelectric element 27, and and the acoustic pressure of the alarm song that sends of piezoelectric element 27 between graph of a relation.In Figure 16, transverse axis is represented pulsewidth, and on behalf of current value, the right Z-axis represent with the X mark, and left side Z-axis representative output acoustic pressure is represented with the square pattern.The voltage of pulse signal is fixed among the figure, and the output acoustic pressure is to measure in the audio amplifier in one to measure a family curve with 30 centimetres distance measurements.When pulsewidth is zero, do not have the electric current generation and be neutral potential, therefore exporting acoustic pressure is zero.When pulsewidth began to increase, the time of keeping neutral potential reduced gradually.When pulsewidth arrived maximal value, current potential can become negative terminal from anode suddenly, or becomes anode from negative terminal.For instance, under 925 hertz frequency, wavelength is approximately 1,080 μ Sec.Therefore the maximum pulse width of pulse signal is approximately 540 μ Sec.
Shown in figure 16, the output acoustic pressure can change in a CF for the ratio of current value.In the frequency of Figure 16, very clearly when pulsewidth be in the scope of 125 ± 50 μ Sec the time, current value is lower, and the output acoustic pressure is higher and more stable.In other words, under above-mentioned CF, best pulsewidth is approximately 125 ± 50 μ Sec.In addition, also can obtain similar data, therefore can further obtain the best pulsewidth of other frequency in other frequency.The data of each best pulsewidth are made a tabulation, and store list is in the software of central control unit 29c, then best pulsewidth promptly can be applicable in the aforesaid operations mode.
The pulse duty factor of pulse signal will be like following explanation.Central control unit 29c produces the pulse signal that will put on piezoelectric element 27, and its dutycycle is 50% to the maximum.In other words, shown in figure 15, its pulsewidth of pulse signal that central control unit 29c produces is less than 1/2nd wavelength (PL＞2PW), so pulse duty factor is less than 50%.Under above-mentioned situation, the pulse signal of anode and negative terminal is to be in the neutral time (current potential is zero) when being zero.The current drain of piezoelectric element 27 is zero in the neutral time.
Therefore, the traditional pulse signal shown in Figure 15 (b), when pulse duty factor gradually when 50% reduces, the current drain of piezoelectric element 27 diminishes gradually, and then when driving piezoelectric element 27, saves the energy.In Figure 14, a telefault is series at piezoelectric element, so in the neutral time, telefault can be adjusted the impedance of piezoelectric element, and discharges the energy that is stored in the telefault.Therefore, the output acoustic pressure of piezoelectric element 27 can increase, and phonation efficiency can further be enhanced.
The above only is the embodiment of the present invention's part, and the present invention can make on structure and method according to the foregoing description and optionally revise and change to derive other embodiment.Example such as the following explanation revised.
Circuit of the present invention can have different designs, even the function of partial circuit can replace carrying out with software program, and the part software function of central control circuit 29c also can replace carrying out with hardware.In embodiments of the present invention, above-mentioned each frequency is to make a tabulation with the data of its corresponding best pulsewidth, and is stored in the software program.Relatively, each frequency also can be stored in non-volatile external memory storage with the data of its corresponding best pulsewidth.In addition, each frequency also can drive piezoelectric element 27 with the mode of real-time feedback with the data of its corresponding best pulsewidth.For instance, the best pulsewidth that drives piezoelectric element 27 can obtain from the information of impedance that monitoring circuit 29e and microphone sensed and acoustic pressure.
The problem that institute of the present invention desire solves is not limited to above-described content with the effect that is provided.The present invention also can solve the problem that foregoing is not described to, and the effect that provides foregoing not to be described to.The present invention also can only solve the subproblem that foregoing is described to, and the part effect that only provides foregoing to be described to.For instance, even the output acoustic pressure of each frequency can't reach maximal value, the present invention still can be progressive to some extent than traditional approach on the efficient of sounding.
The explanation of foregoing circuit and structure, and the relation between each signal just is used for simply describing the present invention, is not to be used for limiting the scope of the invention, so long as not special appointment, all can optionally change.
Industry applications
As previously discussed, acoustical generator of the present invention can produce alarm song according to the output signal of alarm device.Especially, acoustical generator of the present invention can sound the alarm with higher efficient.
Claims (3)
1. fire detection system, it comprises:
Alarm device, its detection be subjected to supervision the zone in abnormal occurrence;
Acoustical generator, it sounds the alarm and in this monitor area, abnormal occurrence takes place with circular, and corresponding each other said alarm device and the said acoustical generator in address links together, the address that said acoustical generator matches this alarm device and this acoustical generator automatically; And
Receiving trap, it connects this alarm device and this acoustical generator, wherein
When this alarm device detects in this monitor area when abnormal occurrence takes place, this alarm device sends fire signal to this receiving trap, and this fire signal comprises the address in order to this alarm device of identification self,
When this receiving trap receives the fire signal from this alarm device; This receiving trap sounds the alarm and issues a signal to this acoustical generator; Make acoustical generator send the burning things which may cause a fire disaster alarm song, this acoustical generator is connected to this and detects the alarm device that abnormal occurrence takes place in this monitor area, and this alarm song that this receiving trap sends sends signal; Make to be different from and be connected to this acoustical generator that detects in this monitor area the alarm device that abnormal occurrence takes place and send related alarm song
This alarm song that makes this acoustical generator send the burning things which may cause a fire disaster alarm song sends signal and comprises an a pair of address and a control command; This comprises the address of this acoustical generator and the address of this alarm device to the address; The address of this alarm device is included in the fire signal; This this acoustical generator of control command control sends the alarm song of a predetermined tone, as this burning things which may cause a fire disaster alarm song
This alarm song that makes this acoustical generator send related alarm song send signal this address is comprised an address and a control command that is different from this acoustical generator that sends this association alarm song; This this acoustical generator of control command control sends the alarm song of another predetermined tone; As this association alarm song
The alarm song that receives from this receiving trap when this acoustical generator sends signal; And when this alarm song sends signal and comprises the address in order to this acoustical generator of identification self; This acoustical generator is specified according to this control command and is sounded the alarm with this predetermined tone; This control command is included in this alarm song and sends in the signal, and by this, this acoustical generator sends this burning things which may cause a fire disaster alarm song or should the association alarm song.
2. fire detection system as claimed in claim 1, wherein,
This acoustical generator comprises sound source, pulse signal applying unit and storage unit, and when this pulse signal applying unit applied this pulse signal in this sound source, this sound source sounded the alarm, a plurality of combinations of the frequency of this this pulse signal of cell stores and pulsewidth, wherein,
This pulse signal applying unit is according to the frequency of this control command decision pulse signal; So that the tone of the alarm song that is sent is same as this control command; This pulse signal applying unit obtains pulsewidth according to this control command; The pulsewidth that is obtained be constitute contain the frequency that is determined from this storage unit a plurality of combinations one of them, and this pulse signal applying unit applies according to this control command and has the frequency that is determined and the pulsewidth that is obtained to this sound source.
3. fire detection system as claimed in claim 2, wherein,
This pulse signal applying unit applies this pulse signal, this pulse signal is alternately produced based on the zero potential mid point that does not produce electric current and in positive and negative two ends, and this pulse signal is identical in the pulsewidth at positive and negative two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010170247 CN101894441B (en) | 2005-05-10 | 2005-05-10 | Fire detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010170247 CN101894441B (en) | 2005-05-10 | 2005-05-10 | Fire detection system |
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|---|---|---|---|
| CNA2005800496970A Division CN101171615A (en) | 2005-05-10 | 2005-05-10 | Alarm outputting device |
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|---|---|
| CN101894441A CN101894441A (en) | 2010-11-24 |
| CN101894441B true CN101894441B (en) | 2012-12-19 |
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| CN 201010170247 Expired - Fee Related CN101894441B (en) | 2005-05-10 | 2005-05-10 | Fire detection system |
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| CN108508794B (en) * | 2018-03-27 | 2019-09-20 | 科德数控股份有限公司 | A kind of audio conversion phonetic representation method and system of device status information |
| CN112072537B (en) * | 2020-08-11 | 2022-03-11 | 国网新疆电力有限公司昌吉供电公司 | Power distribution network overvoltage active early warning system based on ubiquitous Internet of things technology |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2211685A (en) * | 1987-10-28 | 1989-07-05 | Ian Grenville Thomas | Differential volume adjusters |
| CN2499912Y (en) * | 2001-10-15 | 2002-07-10 | 利建明 | Fire alarm device |
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2005
- 2005-05-10 CN CN 201010170247 patent/CN101894441B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2211685A (en) * | 1987-10-28 | 1989-07-05 | Ian Grenville Thomas | Differential volume adjusters |
| CN2499912Y (en) * | 2001-10-15 | 2002-07-10 | 利建明 | Fire alarm device |
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| CN101894441A (en) | 2010-11-24 |
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