CN110474694A - A kind of underwater sound wake-up circuit - Google Patents
A kind of underwater sound wake-up circuit Download PDFInfo
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- CN110474694A CN110474694A CN201910643232.1A CN201910643232A CN110474694A CN 110474694 A CN110474694 A CN 110474694A CN 201910643232 A CN201910643232 A CN 201910643232A CN 110474694 A CN110474694 A CN 110474694A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The present invention provides a kind of underwater sound wake-up circuits, after acoustical signal is converted to electric signal by reception energy converter, it is input to wake-up circuit module, in wake-up circuit module, electric signal carries out signal amplification by pre-amplification circuit first, and the signal of target bandwidth is filtered out using bandpass filter, utilize wave detector demodulated signal, it demodulates the wake-up signal come and is divided into two-way, exported all the way to the CPU of node, sampled and digitized by analog-to-digital conversion；Another way signal is decided whether by detector as wake-up signal.The present invention realizes on-demand dormancy mechanism, reduce the active time of no data, increase the dormancy time of node, so as to reduce the node energy consumption of communication system, chip cost is lower, therefore the implementation cost of circuit is reduced, the wake-up under different transmission ranges to underwater node can be achieved in the present invention, this especially has important value and meaning to underwater platform Remote Wake Up to realization.
Description
Technical field
The present invention relates to technical field of underwater acoustic communication, wake-up circuit under especially a kind of Underwater Acoustic Environment is suitable for the underwater sound
Communication and network node system under environment.
Background technique
Be richly stored with resource in ocean, realize oceanographic observation, resource exploration and exploitation be current each maritime state most
One of the problem of to pay close attention to.In recent years, underwater sound communication and underwater acoustic network due to the continuous expansion in marine information application field and
Made significant headway, ocean is military, marine environment and meteorological research, in terms of there is important answer
With.
But communication and a major issue existing for network node are under Underwater Acoustic Environment: the finite energy of node, because
It is to be battery powered and plan to dispose for a long time for node, so replacement node or supplement power supply are relatively difficult.Therefore it drops
The energy consumption of low node extends hot spot and difficult point that the entirely life cycle of communication and network system is underwater sound communication and network research
One of problem.For this problem, can suspend mode by the wake-up dormancy strategy of design node to increase node as much as possible when
Between, to reduce the energy consumption of node.
The wake-up dormant technology of node mainly includes two parts content: MAC protocol and hardware realization.The wake-up of MAC protocol
Dormancy mechanism is divided into circulation suspend mode and on-demand suspend mode, and for recycling suspend mode, the dormancy time of node is fixed, periodically wake up and
Suspend mode, but in the case where data are less, the unnecessary periodicity of node, which is waken up, will cause a large amount of energy loss；And it is on-demand
Suspend mode means that node only needs to wake up when there is data, can so reduce the unnecessary active time of node, increases node
Dormancy time.The wake-up dormancy mechanism of node shows the performance of mechanism by MAC protocol, and wakes up dormancy mechanism and need firmly
Part realizes this process.
Modern microcontroller usually provides multiple-working mode, is switched between different modes according to performance requirement, with
Power consumption is reduced to the maximum extent.In operation mode, energy consumption can be preferably minimized by suspend mode by turning off CPU, simultaneously to the greatest extent
Possible connection equipment.When very low to communication and traffic requirement, suspend mode can use to maximally reduce energy consumption.
But in such a mode, message cannot be sent and received, it is therefore desirable to which awakening mode wakes up the normal activity of microprocessor.
The hardware circuit very simple of suspend mode is recycled, time synchronization can use real-time clock (RTC chip) even timing
Device is kept.This hardware is very common, and power consumption is very low.And suspend mode is to enable host node in a dormant state on demand, when there is data receipts
When hair, a kind of wake-up circuit is needed by host node wake-up to handle data.Wake-up circuit is comparatively more complicated, because of node
It allows for making a response to certain stimulations.The power consumption of this circuit must be low as far as possible, because of either microcontroller
Suspend mode or active mode, it requires to keep active constantly.Wake-up circuit consumption additional energy be it is valuable, because
To have there is document to prove on-demand suspend mode in terms of reducing system power dissipation better than circulation suspend mode.
However, at present, the work done of this respect and few is waken up for sound.When 2011,
ITACA research institute designs one kind based on the improved sound wake-up circuit of land RFID technique, but this wake-up circuit is scarce
Point is that transplantability is poor, can only operate in 85kHz frequency, this frequency is excessively high under Underwater Acoustic Environment, and communication distance is caused to only have
100m, this communication distance are unable to satisfy most system requirements.
Based on the above research background, it is known that the realization technology that research wakes up dormant technology is based especially on water
The work of acoustic environment is seldom, thus should be by means of Underwater Acoustic Environment the characteristics of, reinforce research to underwater sound wake-up circuit.
Summary of the invention
In order to overcome the disadvantage of wake-up circuit transplantability difference in existing method, the present invention proposes a kind of for Underwater Acoustic Environment
Communication and network node wake-up circuit provide a kind of wake-up circuit applied widely and inexpensive, low-power consumption, make to wake up electricity
Road can be applied to the node of different communication distance in Underwater Acoustic Environment, while during realizing on-demand dormancy mechanism, reduce
The energy and cost overhead of wake-up circuit, so that the capacity usage ratio of whole system is improved,.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of underwater sound wake-up circuit is input to wake-up circuit module after acoustical signal is converted to electric signal by reception energy converter,
In the wake-up circuit module, electric signal carries out signal amplification by pre-amplification circuit first, filters using bandpass filter
The signal of target bandwidth out demodulates the wake-up signal come and is divided into two-way, exported all the way to node using wave detector demodulated signal
CPU, sampled and digitized by analog-to-digital conversion (A/D) device；Another way signal decides whether to call out by detector
Awake signal.
The pre-amplification circuit plate is transistor amplifier, and the electric signal of energy converter output will be received using triode
Amplification, amplification factor are at least 28 times, signal frequency f, select 2SC2240NPN pipe, and R3 parallel connection R7 controls transistor base
Electric current, R1 series connection R3 adjust the base current of triode, to realize direct current biasing, the quiescent point of control circuit, R3 is simultaneously
It connects after connection R7 with R2, R4 controls transistor collector electric current, and R5 series connection R6 controls triode emission electrode current；Capacitor C2, C3
It is connected in parallel on the two sides resistance R7, R6 respectively, capacitor C1, C4 are coupled capacitor, and C1 connects the base input end in triode 2SC2240,
C4 connects the collector output in triode 2SC2240, and it is not in decaying after coupled capacitor that coupling capacity, which is signal,
Minimum value.
The bandpass filter is the active second-order bandpass filter of multichannel negative-feedback, the center frequency of the bandwidth of bandpass filter
Rate is the frequency of wake-up signal, and amplifier ADA4096-2ACPZ-R7, adjustable resistor R3 is selected to be connected in parallel on amplifier ADA4096-
The negative input end and output end of 2ACPZ-R7, the value by adjusting R3 obtain different centre frequencies, and centre frequency is in selected fortune
Within the scope of the effective band put, capacitor C1 is connected on the negative input end of amplifier, and capacitor C2 is connected in parallel on the negative input end of amplifier and defeated
Outlet, shown in the relationship of capacitor, resistance and cutoff frequency such as formula (1):
Wherein, f is the frequency of signal, and R and C are respectively capacitance resistance value, and the value of R9, R10, R9 are determined by formula (1)
In parallel with C1, R10 is in parallel with C2, and capacitor C3 is connected on the output end of amplifier.
The wave detector carries out the envelope detection of signal, restores former modulated signal, completes the demodulation of signal, wave detector is by examining
Wave circuit and integrator are in series, and diode D2 is connect in the feed circuit of operational amplifier TLV2252ID, the anode of D2
The negative input end of operational amplifier TLV2252ID is connect, the cathode of D2 connects the output end of operational amplifier TLV2252ID, and D1 is just
Pole connects the output end of operational amplifier TLV2252ID, and the cathode of D1 connects the input terminal i.e. R11 of integrator, the output of detecting circuit
Signal is input in the integrator that R14 and C1 are composed in parallel by R11, the AC signal that detecting circuit is exported, and is transformed into straight
Signal is flowed, the energy of signal can be obtained.
The output signal of the detector is digital signal, and output result is 1 or 0, when detector judgement wake-up signal is
When useful signal, then output is 1, then wakes up node；When detector judgement wake-up signal is invalid signals such as noise signal, then
Output is 0, will not wake up node.
The detector is voltage comparator, compares the size of two input voltages, and determine according to the result of the comparison defeated
It is high level or low level out, when the signal voltage of wave detector output end is higher than threshold voltage VREFWhen, output result is 1, instead
Output result be 0, the voltage comparator is amplifier TLV3691IDCKR, and R15 is connected in parallel on positive pole and amplifier
The negative input end of TLV3691IDCKR, R16 are connected in parallel on the negative input end and GND of amplifier TLV3691IDCKR, R15 and R16 composition
The negative input end voltage of divider network control amplifier is to be arranged threshold voltage VREF, the pass of resistance R15, R16 and threshold voltage
System is as shown in formula (2):
Wherein, VCC is supply voltage.
The beneficial effect of this technology is:
1, the node microprocessor in suspend mode can be waken up using wake-up circuit, realizes on-demand dormancy mechanism.With circulation
Suspend mode is compared, and node need to only wake up when there is data, reduces the active time of no data, increases the dormancy time of node,
So as to reduce the node energy consumption of communication system, this using battery powered underwater node for being had great importance.
2, the chip cost of this wake-up circuit is lower, therefore reduces the implementation cost of circuit；Simultaneously as chip is equal
Has low power consumption characteristic, which falls below 2.73mW for power consumption, it is achieved that the target of low-power consumption.Since wake-up circuit exists
It is constantly in working condition when node dormancy, the low-power consumption of wake-up circuit itself is for extending the work of underwater platform or underwater node
It is played an important role as the service life.
Since the filter in wake-up circuit can be required according to the working frequency range of underwater sound communication system, by adjusting RC parameter
Centre frequency is arranged.Therefore, which can realize the wake-up under different transmission ranges to underwater node, this is especially to reality
Now there is important value and meaning to underwater platform Remote Wake Up.
Detailed description of the invention
Fig. 1 is the wake-up circuit system block diagram that the present invention designs.
Fig. 2 is the triode preamplifier circuit figure in circuit of the present invention.
Fig. 3 is the band pass filter circuit figure in circuit of the present invention.
Fig. 4 is the detector circuit figure in circuit of the present invention.
Fig. 5 is the detector circuit figure in circuit of the present invention.
Fig. 6 is the analogous diagram of wake-up circuit system of the present invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
In order to solve deficiency existing for current wake-up circuit: transplantability is bad, power consumption is high, at high cost, and the present invention devises
A kind of low cost can be widely applied to Underwater Acoustic Environment, low-power consumption wake-up circuit.
It based on the research to land network, can learn: generate and one wake-up signal of transmission does not need additional hardware.
But receive wake-up signal, analyze the signal come and wake up microcontroller, the specific hardware of these needs of work.Therefore,
We need to design a kind of wake-up circuit of receiving end, since the module needs to be chronically at monitoring state, so circuit is to low
The requirement of power consumption is very stringent.Under Underwater Acoustic Environment, the communication between node is propagated using sound, therefore wake-up circuit
It is to be designed based on acoustical signal.Again because wake-up signal is " friendly signal ", it is possible to learn the frequency of wake-up signal in advance
With the features such as amplitude.
Signal detection is exactly to detect useful signal from inevitable noise.In actual engineer application, Wo Menxu
For the signal wanted often also as some other useless signal or noise, this just needs wake-up circuit to have frequency-selecting ability；This
Outside, in general the signal that wake-up circuit receives all is very faint signal, it needs wake-up circuit to amplify it, is whole
Shape, in order to subsequent signal processing；Finally, wake-up signal and noise are distinguished using detector.So completely calling out
Awake circuit should have selection signal, amplified signal and the ability for distinguishing signal.
A kind of underwater sound wake-up circuit is input to wake-up as shown in Figure 1, receive after acoustical signal is converted to electric signal by energy converter
Circuit module, in the wake-up circuit module, electric signal carries out signal amplification by pre-amplification circuit first, using band logical
Filter filters out the signal of target bandwidth, using wave detector demodulated signal, demodulates the wake-up signal come and is divided into two-way, defeated all the way
Out to the CPU of node, is sampled and digitized by analog-to-digital conversion (A/D) device；Another way signal is adjudicated by detector
It whether is wake-up signal.
The pre-amplification circuit plate is transistor amplifier, as shown in Fig. 2, since input signal is a faint letter
Number, influence of the ambient noise to signal is bigger, therefore in order to reduce the influence of noise, and circuit have low-power consumption and it is low at
This is amplified the electric signal for receiving energy converter output using triode, and amplification factor is at least 28 times, and amplification factor is bigger, electricity
Signal and the easier differentiation of noise, therefore amplification factor will continue to optimize subsequent.Signal frequency is f, selects 2SC2240NPN
Pipe, R3 parallel connection R7 control the electric current of transistor base, and R1 series connection R3 adjusts the base current of triode, to realize that direct current is inclined
It sets, the quiescent point of control circuit, connects after R3 parallel connection R7 with R2, improve the input impedance of amplifying circuit, R4 controls three poles
Pipe collector electric current, R5 series connection R6 control triode emission electrode current；Capacitor C2, C3 are connected in parallel on the two sides resistance R7, R6 respectively, electricity
Hold C5 and be connected in parallel on resistance two sides, isolated DC signal, capacitor C1, C4 are coupled capacitor, play the transmitting of signal, selection coupling
The size of next stage resistance is estimated when capacitor, C1 connects the base input end in triode 2SC2240, and C4 connects in triode
The collector output of 2SC2240, optimal coupling capacity are that signal is not in the smallest of decaying after coupled capacitor
Value.
The bandpass filter be the active second-order bandpass filter of multichannel negative-feedback, advantage be its bandwidth, gain, quality because
Number is easier to adjust, as shown in figure 3, Selection utilization operational amplifier cooperates peripheral circuit as active component in the present invention
RC component design this bandpass filter, the centre frequency of the bandwidth of bandpass filter is the frequency of wake-up signal, according to
The different frequency requirement of various communication systems adjusts centre frequency, and the transplantability of wake-up circuit can be improved.The center of this circuit
Frequency is the frequency that 13kHZ this frequency is wake-up signal, and bandwidth is 10kHZ (can continue to optimize), it is contemplated that the low function of this circuit
Consumption and the requirement to transmission range, sacrifice fractional bandwidth.Amplifier ADA4096-2ACPZ-R7 is selected, adjustable resistor R3 is in parallel
In the negative input end and output end of amplifier ADA4096-2ACPZ-R7, the value by adjusting R3 obtains different centre frequencies, in
Frequency of heart is within the scope of the effective band of selected amplifier, to realize different transmission ranges.Capacitor C1 is connected on the negative of amplifier
Input terminal, capacitor C2 are connected in parallel on the negative input end and output end of amplifier, since the higher capacitance of frequency is smaller, C1, C2
The passable frequency of signal is combination defined, the value of R9, R10 are determined further according to cutoff frequency.Therefore it is selected by the frequency of signal
Select C1, C2 capacitance；Shown in the relationship of capacitor, resistance and cutoff frequency such as formula (1):
Wherein, f is the frequency of signal, and R and C are respectively capacitance resistance value, and the value of R9, R10, R9 are determined by formula (1)
In parallel with C1, R10 is in parallel with C2.Capacitor C3 is connected on the output end of amplifier, and effect is the direct current signal filtered out in output signal.
After electric signal is amplified by transistor circuit, it is input to the bandpass filter by the R9 in Fig. 6, filters out the noise outside bandwidth
Signal, the electric signal in bandwidth, which is exported via R12 to wave detector, carries out energy measuring.
The wave detector carries out the envelope detection of signal, restores former modulated signal, completes the demodulation of signal, and advantage is simulation
Demodulator circuit cost and power consumption are all lower than digital demodulating circuit.It demodulates the wake-up signal come and divides two-way, all the way as output letter
Number output to modem, another way signal is input to detector.Wave detector is in series by detecting circuit and integrator, inspection
The circuit diagram of wave circuit and integrator is as shown in Figure 4.Diode D2 is connect into the feed circuit in operational amplifier TLV2252ID
In, the anode of D2 connects the negative input end of operational amplifier TLV2252ID, and the cathode of D2 connects the defeated of operational amplifier TLV2252ID
Outlet, the anode of D1 connect the output end of operational amplifier TLV2252ID, and the cathode of D1 connects the input terminal i.e. R11 of integrator, detection
The output signal of circuit is input in the integrator that R14 and C1 are composed in parallel by R11, and the exchange of detecting circuit output is believed
Number, it is transformed into direct current signal, the energy of signal can be obtained.
Common detecting circuit diode detection circuit realizes that detection can all generate non-with very big non-linear distortion
The reason of linear distortion, is the imperfection of the unilateal conduction characteristic of diode.And diode D2 is connect and is put in operation by this circuit
In the feed circuit of big device TLV2252ID, line with high accuracy is realized in the quite broad range of detected signal amplitude
Property detection.
The output signal of the detector is digital signal, and output result only has 1 and 0 two kind of situation.When detector is adjudicated
When wake-up signal is useful signal, then output is 1, if notification signal is effective, wakes up node；When detector adjudicates wake-up signal
When for invalid signals such as noise signal, then output is 0, will not wake up node at this time.The type and transmission power of detector, hardware
Power consumption is related, can select different types of detector according to different needs, so that the application range of circuit is more extensive.
The detector is voltage comparator, as shown in figure 5, compare the size of two input voltages, and according to comparing
As a result determine that output is high level or low level, when the signal voltage of wave detector output end is higher than threshold voltage VREFWhen, output
It as a result is 1, otherwise output result is 0, threshold voltage VREFIt is determined by the energy of input signal and noise, threshold voltage needs low
In input signal energy and can obviously distinguish signal and noise.The voltage comparator is amplifier TLV3691IDCKR,
R15 is connected in parallel on the negative input end of positive pole and amplifier TLV3691IDCKR, and it is defeated that R16 is connected in parallel on bearing for amplifier TLV3691IDCKR
Enter end and GND, R15 and R16 composition divider network control the negative input end voltage of amplifier to which threshold voltage V be arrangedREF, electricity
Shown in the relationship such as formula (2) for hindering R15, R16 and threshold voltage:
Wherein, VCC is supply voltage.
The simple process such as the present invention need to only amplify signal, filter, detection and comparison, enable system effectively identify wake-up
Signal does not need the information for carrying out demodulation processing signal.The complexity that can reduce circuit in this way, reduce circuit at
Sheet and power consumption are more applicable for the underwater sound working environment for continuing to keep listening to state.Meanwhile the adjustability and detection of filter
The selection diversity of device can expand wake-up circuit in the application range of Underwater Acoustic Environment, that is, improve the portability of circuit.
By carrying out Multisim emulation to circuit, it is known that the power consumption of the wake-up circuit is 2.73mW, reaches low-power consumption
Target.Wake-up circuit analogous diagram is shown in Fig. 6.
The way circuit figure of wake-up circuit is shown in Fig. 6.The acoustical signal received is converted into telecommunications first with energy converter is received
Number it is input to the input terminal C1 of wake-up circuit module.Input signal first passes around pre-amplification circuit and carries out signal amplification and from C4
Output, is input to bandpass filter using the end R9.It exports by filtered signal from the end C10, is input to using the end R12
Wave detector utilizes wave detector demodulated signal, output end R15.Later, wake-up signal is entered by 1 pin of comparator and is compared
Device decides whether as useful signal.
Below by taking two nodes as an example, the embodiment that provides corresponding wake-up circuit:
The node for needing to communicate there are two in underwater sound communication system, one is transmitting node A, another is receiving node
B.The wake-up circuit module that a present invention designs is added at the periphery of receiving node B, specific step is as follows then communicating:
1. the wake-up circuit module retention value more state of receiving node B detects channel, host node keeps dormant state.
2. transmitting node A needs to send data to receiving node B, but receiving node B is in a dormant state, it is therefore desirable to
It sends a wake-up signal and wakes up receiving node B, it is assumed that it is pulse signal, frequency 13kHz, amplitude 1mV.
3. the wake-up module retention value of receiving node B more detects channel, signal can lose a part of energy by underwater acoustic channel
Amount.It is assumed that loss after acoustical signal by energy converter be converted to electric signal and amplify after, signal amplitude 1mV.It is sent out when detecting
After penetrating the wake-up signal of node A, signal is amplified, is filtered and detection processing, is at this time one by signal known to simulation result
A amplitude is the direct current signal of 12mV.The reference voltage of comparator is set as 10mV, by the judgement of comparator, it is known that input letter
Number be useful signal.Therefore, a notification signal is exported to wake up the microprocessor of receiving node B.
4. replying a response bag notice transmitting node A at this point, receiving node B wakes up from dormant state and being ready for
Receive data.
5. after transmitting node A receives response bag, starting to send data, receiving node B receives data.
Above procedure realizes the mechanism of on-demand suspend mode using wake-up circuit, and node keeps dormant state, once it needs to locate
Data are managed, then receiving node are waken up by wake-up circuit, so that the energy of node is more efficient.The wake-up circuit that the present invention designs expands
The portability for having opened up circuit reduces the expense of cost and energy, extends the life cycle of whole system, logical for the underwater sound
Letter and network get a good eye value.
Claims (5)
1. a kind of underwater sound wake-up circuit, it is characterised in that:
The underwater sound wake-up circuit is input to wake-up circuit module after acoustical signal is converted to electric signal by reception energy converter, described
In wake-up circuit module, electric signal carries out signal amplification by pre-amplification circuit first, filters out mesh using bandpass filter
The wide signal of marker tape demodulates the wake-up signal come and is divided into two-way, exported all the way to node using wave detector demodulated signal
CPU is sampled and is digitized by analog-digital converter；Another way signal is decided whether by detector as wake-up signal.
2. a kind of underwater sound wake-up circuit according to claim 1, it is characterised in that:
The pre-amplification circuit plate is transistor amplifier, is put the electric signal for receiving energy converter output using triode
Greatly, amplification factor is at least 28 times, signal frequency f, selects 2SC2240NPN pipe, and R3 parallel connection R7 controls the electricity of transistor base
Stream, R1 series connection R3 adjusts the base current of triode, thus realize direct current biasing, the quiescent point of control circuit, R3 parallel connection
It connects after R7 with R2, R4 controls transistor collector electric current, and R5 series connection R6 controls triode emission electrode current；Capacitor C2, C3 points
It is not connected in parallel on the two sides resistance R7, R6, capacitor C1, C4 are coupled capacitor, and C1 meets the base input end in triode 2SC2240, C4
Connect the collector output in triode 2SC2240, coupling capacity be signal be not in after coupled capacitor decaying most
Small value.
3. a kind of underwater sound wake-up circuit according to claim 1, it is characterised in that:
The bandpass filter is the active second-order bandpass filter of multichannel negative-feedback, and the centre frequency of the bandwidth of bandpass filter is
The frequency of wake-up signal selects amplifier ADA4096-2ACPZ-R7, adjustable resistor R3 to be connected in parallel on amplifier ADA4096-2ACPZ-
The negative input end and output end of R7, the value by adjusting R3 obtain different centre frequencies, and centre frequency has selected amplifier
It imitates in frequency range, capacitor C1 is connected on the negative input end of amplifier, and capacitor C2 is connected in parallel on the negative input end and output end of amplifier, electricity
Shown in the relationship such as formula (1) of appearance, resistance and cutoff frequency:
Wherein, f is the frequency of signal, and R and C are respectively capacitance resistance value, and the value of R9, R10, R9 and C1 are determined by formula (1)
Parallel connection, R10 is in parallel with C2, and capacitor C3 is connected on the output end of amplifier.
4. a kind of underwater sound wake-up circuit according to claim 1, it is characterised in that:
The wave detector carries out the envelope detection of signal, restores former modulated signal, completes the demodulation of signal, wave detector is by detection electricity
Road and integrator are in series, and diode D2 is connect in the feed circuit of operational amplifier TLV2252ID, and the anode of D2 connects fortune
The negative input end of amplifier TLV2252ID is calculated, the cathode of D2 connects the output end of operational amplifier TLV2252ID, and the anode of D1 connects
The output end of operational amplifier TLV2252ID, the cathode of D1 connect the input terminal i.e. R11 of integrator, the output signal of detecting circuit
It is input to by R11 in the integrator that R14 and C1 are composed in parallel, the AC signal that detecting circuit is exported, is transformed into direct current letter
Number, the energy of signal can be obtained.
5. a kind of underwater sound wake-up circuit according to claim 1, it is characterised in that:
The output signal of the detector is digital signal, and output result is 1 or 0, when detector judgement wake-up signal is effective
When signal, then output is 1, then wakes up node；When detector judgement wake-up signal is invalid signals such as noise signal, then export
It is 0, will not wake up node；
The detector is voltage comparator, compares the size of two input voltages, and determines that output is according to the result of the comparison
High level or low level, when the signal voltage of wave detector output end is higher than threshold voltage VREFWhen, output result is 1, otherwise defeated
Result is 0 out, and the voltage comparator is amplifier TLV3691IDCKR, and R15 is connected in parallel on positive pole and amplifier
The negative input end of TLV3691IDCKR, R16 are connected in parallel on the negative input end and GND of amplifier TLV3691IDCKR, R15 and R16 composition
The negative input end voltage of divider network control amplifier is to be arranged threshold voltage VREF, the pass of resistance R15, R16 and threshold voltage
System is as shown in formula (2):
Wherein, VCC is supply voltage.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Application publication date: 20191119 |