CN107333214B - A kind of audio frequency broadcast system based on area distribution formula speaker - Google Patents
A kind of audio frequency broadcast system based on area distribution formula speaker Download PDFInfo
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- CN107333214B CN107333214B CN201710598312.0A CN201710598312A CN107333214B CN 107333214 B CN107333214 B CN 107333214B CN 201710598312 A CN201710598312 A CN 201710598312A CN 107333214 B CN107333214 B CN 107333214B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/16—Sound input; Sound output
- G06F3/162—Interface to dedicated audio devices, e.g. audio drivers, interface to CODECs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10037—A/D conversion, D/A conversion, sampling, slicing and digital quantisation or adjusting parameters thereof
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10222—Improvement or modification of read or write signals clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/02—Spatial or constructional arrangements of loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
- G11B2020/10537—Audio or video recording
- G11B2020/10592—Audio or video recording specifically adapted for recording or reproducing multichannel signals
Abstract
The invention discloses a kind of audio frequency broadcast systems based on area distribution formula speaker, audio-source, voice-operated device including being located at middle control end, positioned at the main sound box and multiple loudspeakers of terminal；Voice-operated device connects audio-source with control interface by audio interface, by middle control end interface module using coaxial line as transmission line, is separately connected each main sound box positioned at terminal using stelliform connection topology configuration；Main sound box connects the audio-frequence player device that multiple secondary speakers form multichannel；Three kinds of simultaneous transmission audio, control, power supply signals in coaxial line.Present invention wiring is easy easy for construction, and multichannel audio plays, and sound quality is good, and user experience is good, and voice data stream transmission is stablized, strong interference immunity, and avoids own signal and shake influence to sound quality, has broad application prospects.
Description
Technical field
The present invention relates to a kind of audio-frequence player device, specifically a kind of audio based on area distribution formula speaker plays system
System.
Background technique
In places such as school, market, hospitals, often how noisy people is, is difficult to make people quiet.In this case, by management
Obligating for person produces little effect, but social experiment shows to tend to make if playing the music releived in these public places
People calms down, and consciously no longer makes a racket and manufactures noise, so that entire environment be made to become to make one to feel comfortable.
Particularly, in some high-grade hotels, the public domain in the advanced ward of luxury clubhouse or private hospital, due to
Customer group's consuming capacity is higher, and the requirement to background music also correspondinglys increase, and is mainly shown as the requirement to sound quality.Therefore,
Traditional two-channel stereo sound audio system, is no longer satisfied these demands, needs the high-sound quality audio of high fidelity multi-channel
System.
Therefore, it is necessary to dispose audio control system and loudspeaking equipment in such public domain, relative to each height
Region uses completely self-contained audio frequency apparatus, advantageously using centralized audio control system.In addition, also to solve sound
During frequency long distance transmission, the influence of signal decaying or distortion to sound quality.In addition, while transmission audio signal, control letter
Number and power supply signal be also required to simultaneous transmission.
Summary of the invention
The present invention is exactly to solve the above-mentioned problems, to provide a kind of audio broadcasting system based on area distribution formula speaker
System.
The present invention is implemented according to following technical scheme.
A kind of audio frequency broadcast system based on area distribution formula speaker, audio-source, audio frequency control including being located at middle control end
Equipment, positioned at the main sound box and multiple loudspeakers of terminal；
The voice-operated device with control interface connects audio-source by audio interface, by middle control end interface module with
Coaxial line is transmission line, is separately connected each main sound box positioned at terminal using stelliform connection topology configuration；
The voice-operated device includes using fpga chip as the control platform of core, middle control end interface module, power supply mould
Block, fpga chip inside are equipped with multiple logic modules, including Audio Input Modules, control input module, coding module, decoding mould
Block；Audio sample module in the Audio Input Modules isolates audio clock Audio_CLK, and is transmitted to frequency multiplication mould
Block, times frequency module generate the clock signal of multi-frequency on the basis of Audio_CLK, including the control into control input module
The reference clock Ref_CLK_1 of sampling module output processed, the reference clock Ref_CLK_2 exported to middle control end interface module；Institute
Coding module is stated by the way of time-sharing multiplex, is one group of compositing data stream by audio data and control data encoding；Middle control end
Two groups of bandpass filters and a coupling transformer T1 are equipped with inside interface module；The difference output end of coding module passes through one
Bandpass filter connects the secondary windings of coupling transformer T1, and the centre cap of coupling transformer T1 passes through another bandpass filtering
Device connects decoder module input terminal；
The main sound box includes the control platform using fpga chip as core, terminal interface module, power module；FPGA core
Multiple logic modules are equipped with inside piece, the data stream module including coding module and fractionation compositing data stream, fractionation obtains
Control data flow through protocol resolution module and be transferred to main control module；It splits obtained voice data stream and passes through audio output interface
It is sent to audio DAC；The output channel of audio DAC connects loudspeaker；Two groups of bandpass filters are equipped with inside terminal interface module
With a coupling transformer T2；The differential input end of data stream module connects coupling transformer by a bandpass filter
The centre cap of the secondary windings of T2, coupling transformer T2 passes through another bandpass filter connect coding module output end；
Difference anode positioned at middle control end and the armature winding of the coupling transformer of terminal passes through capacitance C1, C2 respectively
External interface connector J1, J2 are connected, difference cathode passes through build-out resistor R1, R2 respectively and connects ground networks；C1 is connected with J1
One end also connects power output end by low-pass filter；One end that C2 is connected with J2, also connects power supply by low-pass filter
Input terminal.
The coaxial line characteristic impedance for controlling end and terminal device in connecting is 50 ohm or 75 ohm, difference matching
The resistance value of resistance R1, R2 and the impedance of coaxial line are equal.
The audio DAC includes no less than two output channels.
Therefrom controlling end on the coaxial line and being sent to the signal transmission rate of terminal is 15~18Mbps, is sent to middle control from terminal
The signal transmission rate at end is 512Kbps~1Mbps.
The voltage of the power input and power output end is 12~24V of direct current.
The transmission bandwidth range that described coupling transformer T1, T2 allow is 100K~100Mbps.
Described external interface connector J1, J2 are bnc connector or SMA connector.
Present invention obtains following beneficial effects.
Audio-source is located at middle control end by the present invention, by transmission line by audio signal transmission to multiple terminals, each terminal
Multiple loudspeakers (including a main sound box and multiple secondary speakers) is set.Each terminal covers certain region, more in region
Channel audio plays, and sound quality is good, and user experience is good；Audio signal real-time Transmission gives multiple terminals, does not postpone, the handover in region
Place, there is no apparent because caused by delay the problem of similar echo；Use audio signal clock as reference clock, avoids
Because of adverse effect of the signal jitter to audio signal；Single coaxial line solves audio, control, power supply three kinds of signals simultaneously
Transmission, does not need unnecessary wiring, easy for construction.
Detailed description of the invention
Fig. 1 is sound intermediate frequency control device structure block diagram of the present invention.
Fig. 2 is the structural block diagram of main sound box in the present invention.
Fig. 3 is the circuit connection diagram of sound intermediate frequency control device interface module of the present invention.
Fig. 4 is the circuit connection diagram of terminal interface module in the present invention.
Fig. 5 is sound intermediate frequency control equipment internal clock signal flow graph of the present invention.
Specific embodiment
Referring to the drawings and embodiment carries out further technology explanation to the present invention.
As shown in Fig. 1~5, a kind of audio frequency broadcast system based on area distribution formula speaker, the sound including being located at middle control end
Frequency source, voice-operated device, positioned at the main sound box and multiple loudspeakers of terminal；
The voice-operated device with control interface connects audio-source by audio interface, by middle control end interface module with
Coaxial line is transmission line, is separately connected each main sound box positioned at terminal using stelliform connection topology configuration；
The voice-operated device includes using fpga chip as the control platform of core, middle control end interface module, power supply mould
Block, fpga chip inside are equipped with multiple logic modules, including Audio Input Modules, control input module, coding module, decoding mould
Block；Audio sample module in the Audio Input Modules isolates audio clock Audio_CLK, and is transmitted to frequency multiplication mould
Block, times frequency module generate the clock signal of multi-frequency on the basis of Audio_CLK, including the control into control input module
The reference clock Ref_CLK_1 of sampling module output processed, the reference clock Ref_CLK_2 exported to middle control end interface module；Institute
Coding module is stated by the way of time-sharing multiplex, is one group of compositing data stream by audio data and control data encoding；Middle control end
Two groups of bandpass filters and a coupling transformer T1 are equipped with inside interface module；The difference output end of coding module passes through one
Bandpass filter connects the secondary windings of coupling transformer T1, and the centre cap of coupling transformer T1 passes through another bandpass filtering
Device connects decoder module input terminal；
The main sound box includes the control platform using fpga chip as core, terminal interface module, power module；FPGA core
Multiple logic modules are equipped with inside piece, the data stream module including coding module and fractionation compositing data stream, fractionation obtains
Control data flow through protocol resolution module and be transferred to main control module；It splits obtained voice data stream and passes through audio output interface
It is sent to audio DAC；The output channel of audio DAC connects loudspeaker；Two groups of bandpass filters are equipped with inside terminal interface module
With a coupling transformer T2；The differential input end of data stream module connects coupling transformer by a bandpass filter
The centre cap of the secondary windings of T2, coupling transformer T2 passes through another bandpass filter connect coding module output end；
Difference anode positioned at middle control end and the armature winding of the coupling transformer of terminal passes through capacitance C1, C2 respectively
External interface connector J1, J2 are connected, difference cathode passes through build-out resistor R1, R2 respectively and connects ground networks；C1 is connected with J1
One end also connects power output end by low-pass filter；One end that C2 is connected with J2, also connects power supply by low-pass filter
Input terminal.
The coaxial line characteristic impedance for controlling end and terminal device in connecting is 50 ohm or 75 ohm, difference matching
The resistance value of resistance R1, R2 and the impedance of coaxial line are equal.
The audio DAC includes no less than two output channels.
Therefrom controlling end on the coaxial line and being sent to the signal transmission rate of terminal is 15~18Mbps, is sent to middle control from terminal
The signal transmission rate at end is 512Kbps~1Mbps.
The voltage of the power input and power output end is 12~24V of direct current.
The transmission bandwidth range that described coupling transformer T1, T2 allow is 100K~100Mbps.
Described external interface connector J1, J2 are bnc connector or SMA connector.
Use step of the invention and principle are as follows:
Voice-operated device includes four interface modules, and each interface module is separately connected different terminals by coaxial line
Equipment, terminal device include multiple output interfaces, and each output interface connects different loudspeakers.
Coaxial line not only transmits audio signal, while also transmission of control signals and power supply signal.Control signal is full duplex
Transmission.Power supply signal is direct current 12V~24V, and the DC impedance of coaxial line is little, and the power consumption of terminal device is lower, thus works as
When the length of transmission line is lower than 200m, pressure drop is smaller.
It obstructs direct current signal in the effect of capacitor C1, C2, AC signal is connected, therefore controlling data and audio data can be with
Pass through, but power supply is isolated；AC signal is obstructed in the effect of concatenated low-pass filter before power module, only allows direct current
Pass through, thus can prevent AC signal from entering power module.
Transformer T1 and T2, realize impedance matching；Single-ended signal is changed into differential signal；It is isolated to a certain extent
High-frequency signal in environment --- the interference of such as mobile phone signal；Direct/Reverse signal is also achieved on same root transmission line
Coupling；Two bandpass filters are only allowed audio signal frequency content corresponding with control signal to pass through respectively, are prevented by frequency-selecting
Only mutual interference.
Audio Input Modules in voice-operated device obtain audio signal from audio-source, are compiled in a manner of S/PDIF after sampling
Code deposit audio buffer district, while on the basis of real-time audio clock, Ref_CLK_1 and Ref_CLK_2 two is generated after frequency multiplication
The different clock signal of a frequency, wherein Ref_CLK_1 is as the sampling clock for controlling signal, when control input module refers to this
Clock, after the control signal sampling issued from audio-source, deposit control buffer area.Coding module is slow from audio buffer district and control
Deposit the data that regular length is extracted in area, in addition different protocol header and agreement tail, by two data streams synthesize one it is compound
Data frame, and terminal is sent to together with power supply signal.The interface module of terminal is believed by capacitor C2 isolated power supply first
Number, and using power supply signal as the power input of terminal, electric energy is provided for terminal；Data stream module is by the control in data flow
System stream and audio flow separation；Control flows through protocol analysis and is sent to main control module, is given a response by main control module.Audio flows through sound
It after the decoding of frequency decoder module, is exported by audio output interface to DAC module, DAC module is by the digital audio and video signals of multichannel
It is converted into the analog audio signal of multichannel, and is exported to multiple loudspeakers.
Terminal is additionally provided with control interface, and for receiving the control signal of terminal input, it is anti-to pass sequentially through coding module later
To being transferred to middle control end, and by final output after the decoding of middle control end to audio source device.To the control signal with forward path
Together, the control signal path of closed loop is formd.
Claims (7)
1. a kind of audio frequency broadcast system based on area distribution formula speaker, including being located at the audio-source at middle control end, audio frequency control is set
It is standby, positioned at the main sound box and multiple loudspeakers of terminal；It is characterized in that,
The voice-operated device connects audio-source with control interface by audio interface, by middle control end interface module with coaxial
Line is transmission line, is separately connected each main sound box positioned at terminal using stelliform connection topology configuration；The coaxial line simultaneous transmission sound
Frequency signal, control signal and power supply signal, power supply signal are direct current 12V ~ 24V；
The voice-operated device include using fpga chip as the control platform of core, middle control end interface module, power module,
Multiple logic modules, including Audio Input Modules, control input module, coding module, decoder module are equipped with inside fpga chip；
Audio sample module in the Audio Input Modules isolates audio clock Audio_CLK, and is transmitted to a times frequency module,
Times frequency module generates the clock signal of multi-frequency on the basis of Audio_CLK, adopts including the control into control input module
The reference clock Ref_CLK_1 of egf block output, the reference clock Ref_CLK_2 exported to middle control end interface module；The volume
Audio data and control data encoding are one group of compositing data stream by the way of time-sharing multiplex by code module；Middle control end interface
Inside modules are equipped with two groups of bandpass filters and a coupling transformer T1；The difference output end of coding module passes through a band logical
Filter connects the secondary windings of coupling transformer T1, and the centre cap of coupling transformer T1 is connected by another bandpass filter
Connect decoder module input terminal；
The main sound box includes the control platform using fpga chip as core, terminal interface module, power module；In fpga chip
Portion is equipped with multiple logic modules, the data stream module including coding module and fractionation compositing data stream, the control split
Data processed flow through protocol resolution module and are transferred to main control module；Obtained voice data stream is split to send by audio output interface
Give audio DAC；The output channel of audio DAC connects loudspeaker；Two groups of bandpass filters and one are equipped with inside terminal interface module
A coupling transformer T2；The differential input end of data stream module connects coupling transformer T2's by a bandpass filter
The centre cap of secondary windings, coupling transformer T2 passes through another bandpass filter connect coding module output end；
Difference anode positioned at middle control end interface module and the armature winding of the coupling transformer of terminal interface module passes through respectively
Capacitance C1, C2 connect external interface connector J1, J2, and difference cathode passes through build-out resistor R1, R2 respectively and connects ground networks；
One end that C1 is connected with J1, also connects power output end by low-pass filter；One end that C2 is connected with J2, also passes through low pass filtered
Wave device connects power input.
2. a kind of audio frequency broadcast system based on area distribution formula speaker as described in claim 1, which is characterized in that the use
The coaxial line characteristic impedance that end and terminal device are controlled in connection is 50 ohm or 75 ohm, the resistance of difference build-out resistor R1, R2
It is worth equal with the characteristic impedance of coaxial line.
3. a kind of audio frequency broadcast system based on area distribution formula speaker as described in claim 1, which is characterized in that the sound
Frequency DAC includes no less than two output channels.
4. a kind of audio frequency broadcast system based on area distribution formula speaker as described in claim 1, which is characterized in that described same
Therefrom controlling end on axis and being sent to the signal transmission rate of terminal is 15~18Mbps, and the signal transmission speed at middle control end is sent to from terminal
Rate is 512kbps~1Mbps.
5. a kind of audio frequency broadcast system based on area distribution formula speaker as described in claim 1, which is characterized in that the electricity
The voltage of source input terminal and power output end is 12~24V of direct current.
6. a kind of audio frequency broadcast system based on area distribution formula speaker as described in claim 1, which is characterized in that the coupling
Closing the transmission bandwidth range that transformer T1, T2 allow is 100 kbps~100Mbps.
7. a kind of audio frequency broadcast system based on area distribution formula speaker as described in claim 1, which is characterized in that described right
External tapping connector J1, J2 are bnc connector or SMA connector.
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| CN201710598312.0A CN107333214B (en) | 2017-07-21 | 2017-07-21 | A kind of audio frequency broadcast system based on area distribution formula speaker |
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| CN201710598312.0A CN107333214B (en) | 2017-07-21 | 2017-07-21 | A kind of audio frequency broadcast system based on area distribution formula speaker |
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| CN107333214B true CN107333214B (en) | 2019-11-12 |
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| CN205566296U (en) * | 2016-04-21 | 2016-09-07 | 中国船舶重工集团公司第七六○研究所 | A direct current carrier wave device for underwater measurement system |
| CN106303342A (en) * | 2015-05-14 | 2017-01-04 | 杭州海康威视数字技术股份有限公司 | A kind of power supply circuits based on supply power coaxially technology |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9252842B2 (en) * | 2012-01-20 | 2016-02-02 | Intersil Americas LLC | Power over coaxial cable |
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2017
- 2017-07-21 CN CN201710598312.0A patent/CN107333214B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2090569U (en) * | 1991-06-26 | 1991-12-11 | 陈国林 | Power supply type radio-frequency coaxial cable |
| CN201163552Y (en) * | 2008-02-22 | 2008-12-10 | 谭洪奎 | Power supply type radio frequency coaxial cable |
| US9344144B1 (en) * | 2012-12-03 | 2016-05-17 | Sprint Communications Company L.P. | Passive intermodulation (PIM) coaxil protection circuit |
| CN203984540U (en) * | 2014-08-01 | 2014-12-03 | 旗瀚科技股份有限公司 | A kind of high definition SDI security monitoring video camera of available coaxial line power supply |
| CN106303342A (en) * | 2015-05-14 | 2017-01-04 | 杭州海康威视数字技术股份有限公司 | A kind of power supply circuits based on supply power coaxially technology |
| CN205566296U (en) * | 2016-04-21 | 2016-09-07 | 中国船舶重工集团公司第七六○研究所 | A direct current carrier wave device for underwater measurement system |
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