CN209472621U - A kind of acoustic array power supply and order downlink multiplex system based on pulse density modulated - Google Patents
A kind of acoustic array power supply and order downlink multiplex system based on pulse density modulated Download PDFInfo
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- CN209472621U CN209472621U CN201920155503.4U CN201920155503U CN209472621U CN 209472621 U CN209472621 U CN 209472621U CN 201920155503 U CN201920155503 U CN 201920155503U CN 209472621 U CN209472621 U CN 209472621U
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Abstract
The utility model discloses a kind of acoustic array power supply and order downlink multiplex system and its control method based on pulse density modulated, the acoustic array power supply includes PC control end, power bus, multiple acoustic arrays being connected respectively by acoustic termination node with the pressure-wire with order downlink multiplex system, and the user of host computer easily can issue simple switch command and dynamic parameter setting command signal to multiple acoustic sensor array of large area are synchronous.The signal is superimposed upon on direct current supply line with the format of serial data, is synchronized and is sent to all acoustic sensor array nodes.The system, which can be realized, adjusts the running parameter dynamic of remote multiple acoustic array nodes.
Description
Technical field
The utility model relates to Underwater Acoustic channels technical fields, more particularly to a kind of acoustic matrix based on pulse density modulated
Column power supply and order downlink multiplex system.
Background technique
Open space acoustic sensor array is that one group of sonic transducer is arranged that in space, formation sound passes according to certain way
Sensor array, so as to obtain space acoustic intelligence abundant, the Processing Algorithm of binding signal realizes that noise suppressed, reverberation are gone
It removes, voice AF panel, sound source direction finding, audio source tracking, the functions such as array gain, and then improves Speech processing quality, mention
Phonetic recognization rate under high true environment.For array topology, mainly there are linear array, face battle array, three-dimensional array.Acoustic sensor array
It is a frontier development in array signal processing field, is widely used in Underwater Acoustics Engineering, environment noise monitoring, interactive voice,
Video conference, smart home are embedded in the fields such as the unmanned plane rescue of microphone array.For different operating scene, passes through and configure
The fixed running parameter of sonic transducer adapts it to working environment, this has often limited to the application range of acoustic array, so to long distance
Running parameter dynamic adjustment from multiple acoustic array nodes is the important topic and problem of urgent need to resolve.
Utility model content
The purpose of this utility model is the running parameter for remote multiple acoustic array nodes existing in the prior art
Dynamic adjust the problem of, and provide it is a kind of based on pulse density modulated acoustic array power supply with order downlink multiplex system.It is led
Wanting application scenarios is the place that the needs such as classroom, hospital, public place largely acquire acoustic signal.It is with University Classroom's
Example needs the acquisition religion in real time in classroom if wanting to realize the functions such as examination hall or the remote recording teacher's open class of no worker monitor
The voice signal of teacher and students, the instrumental acoustics signal of music lesson or other relevant various types of signal, by multiple microphone groups
At acoustic sensor array be a kind of sensor array that can be applied to such scene；Make the user of the host computers such as Central Control Room can be with
Easily simple switch command and dynamic parameter setting command are issued to multiple acoustic sensor array of large area are synchronous
Signal.The signal is superimposed upon on direct current supply line with the format of serial data, is synchronized and is sent to all acoustic sensor array sections
Point.
It is for technical solution used by realization the purpose of this utility model:
A kind of acoustic array power supply and order downlink multiplex system based on pulse density modulated, including PC control end,
Power bus, the multiple acoustic termination nodes being connected with the pressure-wire being made of ground wire and pressure-wire, in which:
The PC control end include the dynamic parameter for adjusting acoustic array and show acoustic array waveform host computer,
For modulating the order modulation module of the dynamic parameter, the DC power supplier for powering to acoustic array and for being superimposed electricity
The adder in source and command signal, the host computer is connect by order modulation module with the input terminal of the adder, with institute
It states the DC power supplier that ground wire is connected to connect with the input terminal of the adder, the output end of the adder and the electricity
The pressure-wire of source bus is connected；
The acoustic termination node includes order demodulation module harmony array element, and the order demodulation module includes multiplexing
The demodulation module of command signal separation module, synchronised clock extraction module and pulse density modulated signals, wherein the multiplexing life
The input terminal of signal separation module is enabled to be connected by branch line with the pressure-wire, the multiplexing commands signal separation module
One output end is connected to provide power supply, the multiplexing commands signal separation module with the acoustic matrix column unit by VCC branch
Another output end be connected with the acoustic matrix column unit by the demodulation modules of pulse density modulated signals transmit to order and believe
Number, the input terminal of the synchronised clock extraction module is connected with the branch line, output end is believed with the multiplexing commands respectively
Number separation module is connected with the demodulation module of the pulse density modulated signals.
In the above-mentioned technical solutions, the order modulation module includes sequentially connected local clock, main control chip and three
State door, the main control chip include with the reference clock of the local clock communication connection and with the tri-state gate communication connection
Pulse density modulated unit.
In the above-mentioned technical solutions, the main control chip of the order modulation module is ALTERA Cyclone IV
EP4CE15F23C8N。
In the above-mentioned technical solutions, the demodulation module of the synchronised clock extraction module and pulse density modulated signals is institute
State the main control chip of order demodulation module, IV EP4CE15F23C8N of model ALTERA Cyclone.
In the above-mentioned technical solutions, the multiplexing commands signal separation module include be connected with the pressure-wire it is passive
Bandpass filter and passive low ventilating filter, the passive bandpass filters pass through amplifier and the impulse density demodulation module
Communication connection is to provide impulse density signal, and the passive low ventilating filter and the acoustic array communication connection are to provide power supply.
In the above-mentioned technical solutions, the acoustic matrix column unit includes that crystal oscillator, converter, main control unit and acoustics pass
Sensor array, for the crystal oscillator for generating local clock, the main control unit includes bit clock phaselocked loop, byte locking phase
Ring, bit clock allocation unit, byte clock allocation unit and data receiver framing, the crystal oscillator is for issuing bit clock
Signal and byte clock signal, institute's bit clock phaselocked loop are used to for the bit clock signal to be sent to the distribution of institute's bit clock single
In member, bit signals for being sent in the byte clock allocation unit by the byte phaselocked loop, the distribution of institute's bit clock
It is concurrent that unit and byte clock unit distribute the bit clock signal received to multiple output signals with byte clock signal respectively
It send into the converter；
The converter is for receiving and converting the bit clock signal and byte clock signal and be delivered to acoustics sensor
Device array, the converter also pass through analogue data branch and are connected with the acoustic sensor array with by acoustic sensor battle array
The analog signal of column acquisition is converted to digital signal, then gives the digital signal of conversion to the data by numerical data branch
Receive framing, the data receiver framing and the ethernet line communication connection.
In the above-mentioned technical solutions, the model ADAU7002 of the converter.
In the above-mentioned technical solutions, IV EP4CE75F23C8N of model ALTERA Cyclone of the main control unit.
The another aspect of the utility model, acoustic array power supply and order downlink multiplex system based on pulse density modulated
Control method, comprising the following steps:
Step 1, host computer receives acoustic data and shows acoustic array waveform, while inputting the ginseng to be adjusted by host computer
Number；
Step 2, the adjustment order of corresponding parameter is converted to the command frame of 3 bytes by host computer, is sent to by serial ports
Order modulation module (current transmission rate is 9600bps), order modulation module passes through command frame described in pulse density modulated；
The main control chip (IV EP4CE15F23C8N of ALTERA Cyclone) of order modulation module parses the command frame, and
With the carrier clock modulation orders frame of 3.072 MHz, modulation system is pulse density modulated；
Step 3, after modulated signal is superimposed by adder with the positive output end of DC power supplier, pass through power supply
Bus is sent to
All acoustic termination nodes；
Step 4, the multiplexing commands signal separation module of acoustic termination node separates command signal and power supply VCC,
To provide local power supply and command signal to the acoustic array；
Step 5, acoustic array executes order, and acoustical signal data are transferred to the host computer by ethernet netting twine.
In the above-mentioned technical solutions, in the step 4, when synchronised clock extraction module detects rising edge, start acoustics
The demodulation module of the impulse density adjustment signal of terminal node, impulse density demodulation module judge whether according to the signal input period
There is order input, if there is order input, carry out counter technique, soft-threshold differentiates, the final demodulation for realizing order.With existing skill
Art is compared, the beneficial effects of the utility model are:
1. improving the working efficiency of acoustic array, elasticity by adjusting to remote multiple sound node running parameter dynamics
Service ability extends the working range of acoustic array.
It is into one 2. simplifying acoustic matrix array structure by power supply and order downlink multiplexing technology, reducing transmission line quantity
Step promotes existing acoustic array and provides technical support.
3. considering multiple acoustic array node working environments, power supply can be a wide range of with the short time with order downlink multiplexing technology
Adjustment running parameter, significantly saved time cost, labour cost, fund cost.
4. the utility model passes acoustical signal back using cable, power supply line passes down the mode of order, because of network cable transmission data
Biography is wrapped using point-to-point UDP message, if passing order down also with passing under cable, the reliability of data upload can be reduced.
In addition the requirement of real-time ordered is high, and network cable transmission mode not can guarantee each acoustic array node real-time synchronization and receive and parse through life
Enable frame.
Detailed description of the invention
Fig. 1 is acoustic array power supply and order downlink multiplexer and method structure based on direct current carrier pulse density modulated
Block diagram.
Fig. 2 is the structural block diagram of order modulation module.
Fig. 3 is the structural block diagram of multiplexing commands separation module.
Fig. 4 is acoustic array power supply and order downlink multiplexer and method modulation flow chart based on pulse density modulated.
Fig. 5 is acoustic array power supply and order downlink multiplexer and method demodulation flow chart based on pulse density modulated.
Specific embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.It should be appreciated that this place
The specific embodiment of description is only used to explain the utility model, is not used to limit the utility model.
Embodiment 1
A kind of acoustic array power supply and order downlink multiplex system based on pulse density modulated, including PC control end,
Power bus, the multiple acoustic termination nodes being connected with the pressure-wire being made of ground wire and pressure-wire, in which:
The PC control end include the dynamic parameter for adjusting acoustic array and show acoustic array waveform host computer,
For modulating the order modulation module of the dynamic parameter, the high-power DC power supply module for powering to acoustic array and being used for
It is superimposed the adder of power supply and command signal, the host computer is connected by order modulation module and the input terminal of the adder
It connects, the high-power DC power supply module being connected with the ground wire is connect with the input terminal of the adder, the adder
Output end is connected with the pressure-wire of the power bus；
The acoustic termination node includes order demodulation module harmony array element, and the order demodulation module includes multiplexing
The demodulation module of command signal separation module, synchronised clock extraction module and pulse density modulated signals, wherein the multiplexing life
The input terminal of signal separation module is enabled to be connected by branch line with the pressure-wire, the multiplexing commands signal separation module
One output end is connected to provide power supply, the multiplexing commands signal separation module with the acoustic matrix column unit by VCC branch
Another output end be connected with the acoustic matrix column unit by the demodulation modules of pulse density modulated signals transmit to order and believe
Number, the input terminal of the synchronised clock extraction module is connected with the branch line, output end is believed with the multiplexing commands respectively
Number separation module is connected with the demodulation module of the pulse density modulated signals.
The dynamic parameter includes array gain, starting, stopping or suspend mode etc., PC control end and the power bus
The power supply signal of multiplexing commands be connected after transmitting at a distance with acoustic termination node by communication connection, the power bus
It connects, acoustic termination node separates multiplexing commands, then is connected respectively by order branch and power branch with acoustic array.
Order modulation module therein is used to sonic transducer node (acoustic array) order that user is arranged in host computer be modulated to arteries and veins
Density signal is rushed, impulse density demodulation module is used to for impulse density signal being demodulated into the command signal of three bytes.
Embodiment 2
The present embodiment is on the basis of embodiment 1 to order modulation module, multiplexing commands signal separation module and acoustic array
It is further elaborated.
It is preferred that the order modulation module includes sequentially connected local clock, main control chip and tri-state gate,
The main control chip includes the pulse with the reference clock of the local clock communication connection and with the tri-state gate communication connection
Density modulation unit.
The course of work are as follows: continuous high frequency rectangle is generated by local clock (clock of order modulation module circuit board itself) and is carried
Wave；Local clock is generated by crystal oscillator, and the frequency of crystal oscillator is fixed frequency, and reference clock is carried out again on the basis of local clock
The process of frequency or frequency dividing, frequency multiplication or frequency dividing is completed by main control chip, and pulse density modulated unit will quantify the order letter of (0/1)
It number is modulated, the command signal of modulation is given to tri-state gate, completes modulation, and modulated signal is given to adder, En
Indicate enable end, En=1, modulation module works, and En=0, modulation module stops working.
It is preferred that the main control chip of the order modulation module is ALTERA Cyclone IV
EP4CE15F23C8N。
It is preferred that the demodulation module of the synchronised clock extraction module and pulse density modulated signals is the life
Enable the main control chip of demodulation module, IV EP4CE15F23C8N of model ALTERA Cyclone.
It is preferred that the multiplexing commands signal separation module includes the passive band logical being connected with the pressure-wire
Filter and passive low ventilating filter, the passive bandpass filters are communicated by amplifier and the impulse density demodulation module
Connection is to provide impulse density signal, and the passive low ventilating filter and the acoustic array communication connection are to provide power supply.
The course of work are as follows: power bus (power supply+command signal) obtains command signal waveform by passive bandpass filters,
Command signal is demodulated by amplifier feed pulse density modulated module；At the same time, power bus passes through passive low pass
DC voltage needed for filter obtains acoustic array is powered work.
It is preferred that the acoustic matrix column unit includes crystal oscillator, converter, main control unit and acoustic sensor
Array, the crystal oscillator for generating local clock, the main control unit include bit clock phaselocked loop, byte phaselocked loop,
Bit clock allocation unit, byte clock allocation unit and data receiver framing, the crystal oscillator is for issuing bit clock letter
Number and byte clock signal, institute's bit clock phaselocked loop be used to the bit clock signal being sent to institute's bit clock allocation unit
In, for the byte phaselocked loop for bit signals to be sent in the byte clock allocation unit, the distribution of institute's bit clock is single
Member and byte clock unit distribute the bit clock signal received to multiple output signals with byte clock signal respectively and send
To in the converter；
The converter is for receiving and converting the bit clock signal and byte clock signal and be delivered to acoustics sensor
Device array, the converter also pass through analogue data branch and are connected with the acoustic sensor array with by acoustic sensor battle array
The analog signal of column acquisition is converted to digital signal, then gives the digital signal of conversion to the data by numerical data branch
Receive framing, the data receiver framing and the ethernet line communication connection.
So guarantee the synchronization of clock signal, and ensure that the high synchronism and high reliability of sound source sampling.Data connect
Framing is received to upload for receiving digital signal and being grouped encapsulation framing.
It is preferred that the model ADAU7002 of the converter.
The course of work are as follows: the acoustic sensor samples space acoustical signal for the rate of 48KHz with sample frequency,
It samples obtained analog signal and passes through converter ADAU7002 with digital signal type through data receiver framing, utilize gigabit ether
Net is transferred to host computer.
It is preferred that IV EP4CE75F23C8N of model ALTERA Cyclone of the main control unit.
Embodiment 3
The control method of the acoustic array power supply and order downlink multiplex system, comprising the following steps:
It builds and installs acoustic array, after connection, start acoustics signal control terminal, check whether the host computer
Whether control terminal operation is normal.
Step 1, host computer receives acoustic data and shows acoustic array waveform, while inputting the ginseng to be adjusted by host computer
Number；
Step 2, the adjustment order of corresponding parameter is converted to the command frame of 3 bytes by host computer, is sent to by serial ports
Order modulation module (current transmission rate is 9600bps), order modulation module passes through command frame described in pulse density modulated；
The main control chip (IV EP4CE15F23C8N of ALTERA Cyclone) of order modulation module parses the command frame, and
With the carrier clock modulation orders frame of 3.072 MHz, modulation system is pulse density modulated；
Step 3, after modulated signal is superimposed by adder with the positive output end of high-power DC power supply module, lead to
It crosses power bus and is sent to all acoustic termination nodes；
Step 4, the multiplexing commands signal separation module of acoustic termination node separates command signal and power supply VCC,
To provide local power supply and command signal to the acoustic array；
Specifically, multiplexing commands signal separation module obtains command signal waveform, order letter by passive bandpass filters
Number waveform is demodulated by amplifier feed pulse density modulated module；At the same time, multiplexing commands signal separation module passes through
It crosses power supply VCC needed for passive low ventilating filter obtains acoustic array and is powered work.
At the same time, power bus can also enter synchronised clock extraction module, extract synchronised clock module guidance multiplexing life
Signal separation module and impulse density demodulation module are enabled, impulse density demodulation module realizes the demodulation of order；
Step 5, acoustic array executes order, and acoustical signal data are transferred to the host computer by ethernet netting twine.
It is preferred that synchronised clock is used to determine starting point when extracting command signal in the step 4, specifically,
The synchronised clock working principle are as follows: the main control unit (IV EP4CE15F23C8N of ALTERA Cyclone) of synchronised clock is with this
Ground high-frequency crystal oscillator is typically much higher than carrier frequency and command signal frequencies as working standard clock, the clock frequency.In order to allow
Each sonic transducer node can accurately capture the position starting point of input order signal, and this system devises special synchronised clock and mentions
Modulus block.The hopping edge of the module real-time monitoring waveform input signal, and therefrom tell by each in modulation orders signal
The starting point of a high level " 1 ".Due to being fixed as 9600Hz, therefore the period of the signal by the transmission rate of modulation orders signal
For a fixed value.Method according to this, as long as guaranteeing there are several high level in each command byte " 1 ", can be realized related synchronization
The accurate extraction of clock.And it includes no less than 3 high level that command byte, which can ensure each byte when setting rule,
"1".Therefore, accurate sampling of each sonic transducer node to down order byte may be implemented in this method.
It is, starting the arteries and veins of acoustics terminal node when clock extraction module detects rising edge when in sync (high level)
The demodulation module of Auto-regulating System of Density of Heavy Medium signal is rushed, impulse density demodulation module judges whether there is order according to the signal input period and inputs,
If there is order input, counter technique is carried out, soft-threshold differentiates, the final demodulation for realizing order.
It is preferred that the parameter adjustment order of the step 2 includes array gain, starting, stopping or suspend mode etc..
The above is only the preferred embodiment of the utility model, it is noted that for the general of the art
For logical technical staff, without departing from the principle of this utility model, several improvements and modifications can also be made, these change
It also should be regarded as the protection scope of the utility model into retouching.
Claims (8)
1. a kind of acoustic array power supply and order downlink multiplex system based on pulse density modulated, which is characterized in that including upper
Machine control terminal, the power bus being made of ground wire and pressure-wire, multiple acoustic termination nodes being connected with the pressure-wire,
In:
The PC control end includes the dynamic parameter for adjusting acoustic array and shows the host computer of acoustic array waveform, is used for
Modulate the order modulation module of the dynamic parameter, the DC power supplier for powering to acoustic array and for be superimposed power supply and
The adder of command signal, the host computer are connect by order modulation module with the input terminal of the adder, with described
The DC power supplier that line is connected is connect with the input terminal of the adder, and the output end of the adder and the power supply are total
The pressure-wire of line is connected；
The acoustic termination node includes order demodulation module harmony array element, and the order demodulation module includes multiplexing commands
The demodulation module of signal separation module, synchronised clock extraction module and pulse density modulated signals, wherein the multiplexing commands letter
The input terminal of number separation module is connected by branch line with the pressure-wire, and the one of the multiplexing commands signal separation module is defeated
Outlet is connected to provide power supply with the acoustic matrix column unit by VCC branch, the multiplexing commands signal separation module it is another
One output end is connected by the demodulation module of pulse density modulated signals with the acoustic matrix column unit to transmit command signal, institute
The input terminal for stating synchronised clock extraction module is connected with the branch line, output end respectively with the multiplexing commands Signal separator
Module is connected with the demodulation module of the pulse density modulated signals.
2. acoustic array power supply and order downlink multiplex system, feature based on pulse density modulated as described in claim 1
It is, the order modulation module includes sequentially connected local clock, main control chip and tri-state gate, and the main control chip includes
Pulse density modulated unit with the reference clock of the local clock communication connection and with the tri-state gate communication connection.
3. acoustic array power supply and order downlink multiplex system, feature based on pulse density modulated as claimed in claim 2
It is, the main control chip of the order modulation module is IV EP4CE15F23C8N of ALTERA Cyclone.
4. acoustic array power supply and order downlink multiplex system, feature based on pulse density modulated as described in claim 1
It is, the demodulation module of the synchronised clock extraction module and pulse density modulated signals is the master control of the order demodulation module
Chip, IV EP4CE15F23C8N of model ALTERA Cyclone.
5. acoustic array power supply and order downlink multiplex system, feature based on pulse density modulated as described in claim 1
It is, the multiplexing commands signal separation module includes the passive bandpass filters being connected with the pressure-wire and passive low pass
Filter, the passive bandpass filters are close to provide pulse by amplifier and the impulse density demodulation module communication connection
Signal is spent, the passive low ventilating filter and the acoustic array communication connection are to provide power supply.
6. acoustic array power supply and order downlink multiplex system, feature based on pulse density modulated as described in claim 1
It is, the acoustic matrix column unit includes crystal oscillator, converter, main control unit and acoustic sensor array, the crystal vibration
Swing device for generating local clock, the main control unit include bit clock phaselocked loop, byte phaselocked loop, bit clock allocation unit,
Byte clock allocation unit and data receiver framing, the crystal oscillator is for issuing bit clock signal and byte clock letter
Number, institute's bit clock phaselocked loop is for the bit clock signal to be sent in institute's bit clock allocation unit, the byte-lock
Bit signals for being sent in the byte clock allocation unit by phase ring, institute's bit clock allocation unit and byte clock list
Member is distributed the bit clock signal received and byte clock signal to multiple output signals respectively and is sent in the converter；
The converter is for receiving and converting the bit clock signal and byte clock signal and be delivered to acoustic sensor battle array
Column, the converter also pass through analogue data branch and are connected with the acoustic sensor array to adopt acoustic sensor array
The analog signal of collection is converted to digital signal, then gives the digital signal of conversion to the data receiver by numerical data branch
Framing, the data receiver framing and the ethernet line communication connection.
7. acoustic array power supply and order downlink multiplex system, feature based on pulse density modulated as claimed in claim 6
It is, the model ADAU7002 of the converter.
8. acoustic array power supply and order downlink multiplex system, feature based on pulse density modulated as claimed in claim 6
It is, IV EP4CE75F23C8N of model ALTERA Cyclone of the main control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920155503.4U CN209472621U (en) | 2019-01-29 | 2019-01-29 | A kind of acoustic array power supply and order downlink multiplex system based on pulse density modulated |
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| CN201920155503.4U CN209472621U (en) | 2019-01-29 | 2019-01-29 | A kind of acoustic array power supply and order downlink multiplex system based on pulse density modulated |
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ID=68094285
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| CN201920155503.4U Withdrawn - After Issue CN209472621U (en) | 2019-01-29 | 2019-01-29 | A kind of acoustic array power supply and order downlink multiplex system based on pulse density modulated |
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