CN104092507A - Wireless paging and broadcasting workstation for schoolmaster - Google Patents
Wireless paging and broadcasting workstation for schoolmaster Download PDFInfo
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Abstract
The invention relates to a wireless paging and broadcasting workstation for a schoolmaster. The wireless paging and broadcasting workstation for the schoolmaster comprises a sub-control host, a receiving host, a wireless receiving terminal and a wireless repeater, wherein the receiving host receives signals of the sub-control host and is connected with a power amplifier and a column loudspeaker in a controlling mode, the wireless receiving terminal directly receives radio-frequency signals sent by the sub-control host and controls all zones, and the wireless repeater is used for amplifying signals of the sub-control host and providing the remote transmission function. The wireless paging and broadcasting workstation for the schoolmaster is simple in structure, reliable in control and low in installation and maintenance cost.
Description
Technical field
The present invention relates to broadcast technology field, relate in particular to a kind of function intensified and update device of Campus Broadcasting System.
Background technology
Existing Campus Broadcasting System mainly comprises level pressure sectorization broadcast system, addressable (level pressure) broadcast system and digital IP broadcast system.
Level pressure sectorization broadcast system, current most of school is all used this system, this system is that the broadcast of whole campus is divided into several subregions by grade classroom, sports ground, teaching area, each subregion sets up separately a broadcast wire to studio, by the equipment of studio, the broadcast of each subregion is controlled.The problem that this broadcast system exists is: the one, and the stationarity of broadcast subregion and the contradiction between mobility.In stationary state, quite loaded down with trivial details during change after the broadcast wire of subregion installs, and look like the level sectorization broadcast per year such as English Listening Comprehension examination and broadcast announcement, but the classroom of each grade all changes every year; The 2nd, because number of partitions is more, circuit is pooled to studio makes system numerous and diverse, and line cost and installation cost sharply increase, and maintenance difficulties strengthens simultaneously, and maintenance cost increases; The 3rd, the operation of broadcasting equipment is comparatively loaded down with trivial details, learning process that need to be longer, and the announcer in broadcasting station, campus is generally student, and student's mobility is large, and the training time is longer, if even cause damage the useful life that operation can shortening equipment when unskilled; The 4th, principal or the leader of other schools want broadcast announcement must go to studio, not only expend time in but also inconvenient, are unfavorable for campus management.
Addressable (level pressure) broadcast system, this system is that each broadcast point (as classroom) is installed to 1 addressing device, each addressing device gets up with a public broadcasting line and address signal line parallel, removes to control the Kai Heguan of each broadcast point with addressing device; Utilize PC computer and addressable broadcast main frame to send address signal, realize some control or sectorization broadcast and control.Although this broadcast system has solved level pressure sectorization broadcast system and has adjusted the problem of subregion difficulty by grade classroom, has equally following defect: the one, equipment cost is high, addressing main frame and PC computer expensive, the expense of the addressing terminal in each classroom is also higher; The 2nd, installation cost is high, each terminal is tied and receive studio with netting twine, needs the extraordinary netting twine of quality and higher Installation and Debugging expense; The 3rd, troublesome maintenance, because control line (netting twine) has many nodes, is oxidized, gets rusty, damaged by rats is easy to cause the system failure; The 4th, operate need to be higher specification requirement, need special messenger to operate, be not suitable for student operation; The 5th, principal wants broadcast announcement must go to studio or entrusts special messenger's broadcast, but general school does not have special messenger to broadcast.Therefore this broadcast system is also difficult to popularize.
Numeral IP broadcast system, digital IP broadcast system transmits broadcast singal by server by utilizing local area network (LAN) (or the Internet).In each broadcast point (as each classroom), establish a terminal, can realize the addressable broadcast to each broadcast point, the place of wanting of also can in officely what is the need for arranges broadcast extension set, is convenient to the daily broadcast of student and principal's broadcast announcement.The complete function of this broadcast system, the main problem existing: the one, need a local area network platform; The 2nd, involve great expense; The 3rd, troublesome maintenance; The 4th, use action need professional.Therefore this broadcast system can not penetration and promotion, can only become the luxury goods of only a few school.
Summary of the invention
The applicant is for the existing shortcoming of above-mentioned Campus Broadcasting System, provides that a kind of equipment and installation cost are low, reliable operation, the simple principal's radio call broadcast of maintenance work station, as the function intensified and update device of Campus Broadcasting System.This application of installation, in any existing simple and easy constant-voltage broadcasting system, can make former simple and easy broadcast system upgrade to wireless zoned addressable broadcast system and the powerful easy-to-use broadcast system with wireless addressing sub-control broadcast and principal's radio call broadcast capability.
The technical solution adopted in the present invention is as follows:
Principal's radio call broadcast work station, this system comprises sub-control main frame, Receiving Host, radio receiving terminal, wireless repeater; The signal controlling that described Receiving Host receives described sub-control main frame connects power amplifier and sound column;
Described sub-control main frame comprises the first sub-control main frame and the second sub-control main frame, the first sub-control main frame comprises sub-control power module, the wireless zoned address signal transmitter module being connected with sub-control power module, subregion operating state indicating module, audio-frequency module, MP3 playing module and operation push-button; Relative the first sub-control main frame of described the second sub-control main frame reduces MP3 playing module; Described sub-control main frame is launched subregion addressing radio signal, by audio-frequency module, to power amplifier, is provided sound source signal by wireless zoned address signal transmitter module, and then to classroom audio amplifier and outdoor sound column, provides audio power signal by power amplifier;
Described Receiving Host comprises reception power module, the first receipt decoding module, photoelectric isolation module, manual control module, external trigger control module, indicating module and the relay Executive Module that are connected with reception power module; Described the first receipt decoding module comprises receiver module and single chip control module; The first receipt decoding module is respectively used to the sound column of control partition and the power supply of power amplifier by receiving control signal and the power supply clock signal of subregion; Described relay Executive Module is comprised of triode and relay; Described photoelectric isolation module carries out electrical isolation by a plurality of optocouplers by the first receipt decoding module, single chip control module and relay; Described manual control module is comprised of a plurality of self-lock switchs, and described self-lock switch is used for controlling described relay; Described external trigger module is for controlling other Broadcasting Control modes except described sub-control main frame;
Described radio receiving terminal comprises wireless receiving power module, the second receipt decoding module being connected with wireless receiving power module, partition address code setting module, divisional signal gating module, photoelectric isolation module and relay Executive Module; Described radio receiving terminal is received the subregion addressing radiofrequency signal that the wireless zoned address signal transmitter module of described sub-control main frame sends and is decoded the subregion control signal containing address by the second receipt decoding module;
Described the first receipt decoding module is consistent with the operation principle of the second receipt decoding module;
Described repeat circuit is connected with described sub-control main frame, for amplifying the wireless signal of described sub-control main frame.
Further improvement as technique scheme:
Described the first receipt decoding module and the second receipt decoding module form by switch, diode OR gate road;
Described operation push-button is alone button;
Described operation push-button is multiplexing button, and multiplexing key function is realized by Single Chip Microcomputer (SCM) program;
The audio frequency output voltage effective value of described audio-frequency module is greater than 5V, and sound output is greater than 1W.
Beneficial effect of the present invention is as follows:
(1) can realize wireless zoned addressable broadcast: the one, can realize sectorization broadcast, the quantity of broadcast subregion is 16 or more, can meet the teaching management demand of most schools; The 2nd, each subregion is addressable, and each subregion has independently address code, and the address code of each terminal is to compile address code, and the terminal of identical address coding belongs to same subregion, only needs to change terminal coding and just can change terminal place subregion.Solved and in existing level pressure sectorization broadcast system, usingd classroom of the same grade and can not change the difficult problem in grade classroom as partition management; The 3rd, the control of subregion addressing is controlled in wireless, i.e. the connection of each classroom broadcast terminal only needs 1 public broadcasting circuit, without many broadcast wires or control signal wire.The present invention can reduce equipment and installation cost, makes system reliability high, safeguards simple;
(2) how easily by sub-control main frame, can be realized away from place in office, studio and being broadcasted, its control range is wide, easy and simple to handle;
(3) can be for simultaneously directly radio talks (can extend to many people while needing) of two people by sub-control main frame, also can broadcast song.During broadcast song, can play-over the MP3 song in USB flash disk by the USB flash disk socket the machine, also can external DVD or deck broadcast audio program.Meet the needs of normal broadcast completely.
(4) during by sub-control host broadcast, simple to operate, even if the equipment of operate miss Ye Buhuidui studio causes damage.The startup and shutdown of studio of the present invention power amplifying device are fully automatic mode, and without going to studio to operate, when many power amplifiers need be opened, time delay is automatically opened out power amplifier and automatically closed power amplifier sequentially; Operation is simple and reliable for sub-control main frame of the present invention, only needs the switch key on control panel.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is structured flowchart of the present invention.
Fig. 3 is sub-control main frame theory diagram of the present invention.
Fig. 4 is the theory diagram of Receiving Host of the present invention.
Fig. 5 is the theory diagram of radio receiving terminal of the present invention.
Fig. 6 is the alone key pattern of 6 subregion of the present invention sub-control host panel structure chart.
Fig. 7 is the multiplexing key pattern of 16 subregion of the present invention sub-control host panel structure chart.
Fig. 8 is the alone key pattern of 16 subregion of the present invention sub-control host panel structure chart.
In figure: 1, the first sub-control main frame; 2, the second sub-control main frame; 11, sub-control power module; 12, wireless zoned address signal transmitter module; 13, subregion operating state indicating module; 14, audio-frequency module; 15, MP3 playing module; 16, operation push-button; 3, Receiving Host; 31, receive power module; 32, the first receipt decoding module; 33, photoelectric isolation module; 34, manual control module; 35, external trigger control module; 36, relay Executive Module; 37, indicating module; 4, radio receiving terminal; 41, wireless receiving power module; 42, the second receipt decoding module; 43, partition address code setting module; 44, divisional signal gating module; 45, photoelectric isolation module; 46, relay Executive Module; 5, studio; 6, sound column; 7, wireless repeater; 8, power amplifier.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.
As shown in Figure 1 and Figure 2, the Campus Radio Broadcast System of the present embodiment, this system comprises sub-control main frame, Receiving Host 3, radio receiving terminal 4, wireless repeater 7; The signal controlling that Receiving Host 4 receives sub-control main frame connects power amplifier 8 and sound column 6;
As shown in Figure 3, sub-control main frame comprises the first sub-control main frame 1 and the second sub-control main frame 2, the first sub-control main frame 1 comprises sub-control power module 11, the wireless zoned address signal transmitter module 12 being connected with sub-control power module 11, subregion operating state indicating module 13, audio-frequency module 14, MP3 playing module 15 and operation push-button 16; Relative the first sub-control main frame 1 of the second sub-control main frame 2 reduces MP3 playing module 16; Sub-control main frame is by wireless zoned address signal transmitter module 12 transmitting subregion addressing radio signals, provide sound source signal to power amplifier 8 and sound column 6 by audio-frequency module 14, sound source signal as music, announcer or principal's spoken sounds can certain distance in any place in (1000 meters) high-fidelity be sent to the power amplifier 8 of studio or outdoor sound column 6; The transmission of sound source signal has two schemes: the one, and wired load mode, the 2nd, wireless transmissioning mode.Wired load mode is that the musical sound of millivolt level or sound of speech are transmitted about audio frequency amplifier is amplified to peak value 30V, can reduce the interference in signals transmission like this, at studio's receiving terminal, again audio signal be decayed to the intensity that is applicable to the input of power amplifier circuit; Wireless transmission scheme generally adopts 2.4G wireless technology, can accomplish that like this high-fidelity transmits music signal.
As shown in Figure 4, Receiving Host 3 comprises reception power module 31, the first receipt decoding module 32, photoelectric isolation module 33, manual control module 34, external trigger control module 35, indicating module 37 and the relay Executive Module 36 that are connected with reception power module 31; The first receipt decoding module 32 comprises receiver module and single chip control module; The first receipt decoding module 32 is by receiving the control signal of subregion and sound column 6 that power supply clock signal is respectively used to control partition and the power supply of power amplifier 8; Relay Executive Module 36 is comprised of triode and relay; Photoelectric isolation module 33 carries out electrical isolation by a plurality of optocouplers by receipt decoding module, single chip control module and relay; Manual control module 34 is comprised of a plurality of self-lock switchs, and self-lock switch is for control relay; External trigger module 35 is for controlling other Broadcasting Control modes except sub-control main frame; Receiving Host 3 receives after any sectored wireless address signal that sub-control main frame sends, the power supply of power amplifier 8 will be opened automatically, because power amplifier 8 comprises respectively a plurality of, it is opened sequentially automatically, with guarantee power supply not many power amplifiers of reason 6 open simultaneously and cause the impact to electrical network, the indicating module 37 of Receiving Host 3 will receive sub-control host signal and indicate simultaneously; Receiving Host 3 also can directly be exported the control signal of each subregion, saves the outdoor wireless receiving terminal 4 for outside broadcast subregion (sound column 6), the broadcast wire of outdoor subregion is directly received to the Receiving Host 3 that is positioned at studio 5.
As shown in Figure 5, radio receiving terminal 4 comprises wireless receiving power module 41, the second receipt decoding module 42 being connected with wireless receiving power module 41, partition address code setting module 43, divisional signal gating module 44, photoelectric isolation module 45 and relay Executive Module 46; The subregion addressing radiofrequency signal that the wireless zoned address signal transmitter module that radio receiving terminal 4 receives sub-control main frame by the second receipt decoding module 42 sends also decodes the subregion control signal containing address, and determine it is to connect enter the broadcast singal of this terminal or disconnect broadcast singal according to the coding of this terminal, the zonal coding of each terminal adopts DIP switch simultaneously, DIP switch is in external capable of regulating state, to facilitate the adjustment of each subregion.
Repeat circuit 7 is connected with sub-control main frame, for amplifying the wireless signal of sub-control main frame, with larger power, synchronously forwards, to propagate farther distance and to facilitate long-range radio receiving terminal 4 to receive signal.
By specific embodiment, the present invention is further described below.
For the time being representing that the subregion of a grade is 1 subregion.
As shown in Figure 1, for example principal will be to all first-year student radio talks, you only need click " opening for the one grade " button on sub-control host panel, sub-control main frame just by radio wave will contain " open for one grade;; the radiofrequency signal (being radio signal) of coded message launch, the radio receiving terminal 4 in the Receiving Host 3 of studio 5 and outdoor wireless repeater 7 and classroom all can receive this signal.When receiving this signal, Receiving Host just can decode to this signal, after decoding, through single-chip microcomputer, process the starting-up signal of output First power amplifier and the time delay starting-up signal of second, the 3rd power amplifier, export the control signal of 1 subregion simultaneously, make 1 section indicator bright, and export the switching signal (standby) that 11 grade subregion is connected.Wireless repeater 7 after receiving this radiofrequency signal forwards this signal, so that farther receiving terminal is received this signal.Radio receiving terminal 4 is decoded to this signal after receiving this radiofrequency signal, decoding is processed and is become a switching signal (Low level effective that contains address information by single-chip microcomputer, low level is opened for broadcasting, high level is broadcast pass), then through 1 address code identification circuit identification, if the address that the address of this signal sets with this receiving terminal is consistent, allow this switching signal to pass through, with this, go the connecting and disconnecting of further control relay, thereby realize the effect that each classroom terminal subregion addressing is controlled.
Meanwhile, the audio amplifier circuit in sub-control main frame is amplified to by microphone signal or music signal power amplifier or the tuning device of delivering to studio about 30V by audio transmission line.Therefore because the audio signal voltage of transmission is higher, long-distance transmissions can be carried out and interference-free; Due to the signal code little (mA level) of transmission, therefore less demanding to transmission line, can 1000 meters of above distances (high-quality line can transmit more than 2000 meters) of high-fidelity transmission with cheap ordinary telephone line.Can meet the requirement of any sub-control broadcast in general campus.At power amplifier end or tuning device end, this signal attenuation to 500M V left and right is become to normal line input signal, by tuning device and power amplifying device, be treated as general 100V level pressure public broadcasting signal.
The straight-through classroom of a 100V level pressure public broadcasting signal part of being exported by power amplifier, the power amplifier signal input part of part access Receiving Host 4, then according to the subregion address signal receiving, determine to open which outside broadcast subregion by Receiving Host 4.Process during shutdown similarly, is just pressed " pass ".So far, completed the overall process of this broadcast.
The 2nd approach of audio transmission is to adopt 2.4G wireless transmission scheme.The technology of this scheme is the cheap telephone wire of the company of saving.
Below the operation principle of sub-control main frame is further described.
As shown in Figure 2, sub-control main frame comprises the first sub-control main frame 1 and the second sub-control main frame 2, by using the difference first sub-control main frame 1 of object, for announcer, broadcast, be called again " wireless zoned addressing broadcast work station sub-control main frame ", the second sub-control main frame 2 is for the leader of school broadcast such as principals, be called principal's radio call broadcasting station sub-control main frame, wherein the latter is the former function simplification version, and the music modules such as MP3 broadcasting in the former are removed.Sub-control main frame can make alone button or multiplexing button by operation push-button 16.Alone key pattern is that a function key can only have a kind of function, example: if 1# key is used as the function that 1 subregion is opened, the function that 1 subregion closes must go to realize with another 1 key; Multiplexing key pattern is that a function key realizes two kinds of functions, example: 1# key does 1 subregion key point, does again 1 subregion crucial, and by for the first time, for opening, by next time, for closing, vice versa.Sub-control main frame is by the number of partitions of institute's addressing, and we design two kinds of conventional models: 6 subregion addressing (as Fig. 6) and 16 subregion addressing (as Fig. 7 and Fig. 8).Wherein in the sub-control main frame of 16 subregion addressing, having 2 subregions is subregions of broad sense: the one, and all studio broadcast subregions (1-8 subregion), are called for short indoor subregion; The 2nd, all outdoor subregions (9-14 subregion), are called for short outdoor subregion.This type is generally used in extremely above school of 6 year.In the sub-control main frame of six subregion addressing, having a subregion is broad sense subregion (all subregions), and the subregion starting while pressing this key is 5 subregion Simultaneous Switchings;
Subregion operating state indicating module 13 in sub-control main frame, the radiofrequency signal of being responsible for that the sub-control main frame receiving is sent is decoded into the indication signal of telecommunication of partition address;
The design rule of the audio-frequency module 15 in sub-control main frame is that audio frequency output voltage effective value must be more than 5V, and sound output is more than 1W, and its voltage is higher, and antijamming capability is stronger, and transmission range is far away.Audio frequency output voltage of the present invention can reach 20V, more than power output 5W.Wireless zoned address signal transmitter module 12 is formed circuit, radio circuit and antenna etc. and is formed (belonging to prior art, not shown) by key circuit (producing the instruction of geocoding), coding circuit, address code signal.
As shown in Figure 8, this kind of sub-control main frame shares 32 buttons (touch-switch) to the alone key pattern of 16 subregion of the present invention sub-control main frame, with S1-S32, represents.Wherein odd number button is done " subregion is opened " button, and even number button is done " subregion pass " button, and S1-S16 and S27, S28 be for studio broadcast subregion, and S17-S26 is for outside broadcast minute (1 subregion-5 subregion), 6 subregions stay do motor-driven.The interior touch-switch of button and coding circuit and the diode OR gate the electric circuit constitute being attached thereto, when pressing a certain button just by the diode being connected with each position datawire, produce a parallel pulse data signal of 6 binary systems that represents partition address and switch, be code signal, the code signal for example, producing while pushing button S15 is D5=1M, D4=1M, D3=1M, D2=1M, D1=0, DO=0.This signal or data, via coding circuit special chip PT2262 transformed into serial data, are sent in the radio circuit being comprised of triode, Surface Acoustic Wave Filter, antenna etc. and are launched.Coding circuit wherein, a rule that is diode OR gate the electric circuit constitute is, when pressing touch-switch SN (N=1,2,3 ... 32) time, switch and diode are sent to the high level signal of data wire D5, D4, D3, D2, D1, D0 thus, should defer to the cumulative rule of 6 bits, in Table one.
Multiplexing key pattern sub-control main frame of the present invention, as shown in Figure 7, with the sub-control main frame of multiplexing key pattern, can save the button of half, but its launching code circuit can not be realized by ready-made remote control coding circuit such as PT2262 chips, and must realize by Single Chip Microcomputer (SCM) program, in the time of must pressing same key by this kind of method, produce the result of 2 kinds of states, press for the first time as opening, press for the second time as closing.By Single Chip Microcomputer (SCM) program, remembered and produced this two different address signals, single-chip microcomputer produces 32 search switch signals, i.e. the pass signal of opening signal and 16 addresses of 16 addresses with 16 buttons.This is a rule to the coding Single Chip Microcomputer (SCM) program function that will realize.
Receiver module 32 in Receiving Host 3 of the present invention and radio receiving terminal 4, 42 operation principle is as follows: receiver module receives after certain subregion addressing radiofrequency signal of sub-control main frame, 6 parallel-by-bit pulse signal bags (referred to as the switch data with address) of the switching information that decoding output contains address information, its duration is depended on the time pushing button on sub-control main frame, these data are processed through single-chip microcomputer and internal processes thereof, produce the 1 locking thick switching signal in road and 5 road power supply sequential items (in order successively time delay 2-3 open or close 5 power amplifiers and electrical equipment second), and low electricity effect effectively, the switching signal that this road band latchs is the control signal that needs to open or close certain road subregion.Wherein, the input and output rule that Single Chip Microcomputer (SCM) program is processed as shown in Table 1.
More than describing is explanation of the invention, is not the restriction to invention, and limited range of the present invention is referring to claim, and without prejudice to spirit of the present invention in the situation that, the present invention can do any type of modification.
Claims (5)
1. principal's radio call broadcast work station, is characterized in that: this system comprises sub-control main frame, Receiving Host (3), radio receiving terminal (4), wireless repeater (7); The signal controlling that described Receiving Host (4) receives described sub-control main frame connects power amplifier (8) and sound column (6);
Described sub-control main frame comprises the first sub-control main frame (1) and the second sub-control main frame (2), the first sub-control main frame (1) comprises sub-control power module (11), the wireless zoned address signal transmitter module (12) being connected with sub-control power module (11), subregion operating state indicating module (13), audio-frequency module (14), MP3 playing module (15) and operation push-button (16); Relative the first sub-control main frame (1) of described the second sub-control main frame (2) reduces MP3 playing module (16); Described sub-control main frame is launched subregion addressing radio signal, by audio-frequency module (14), to power amplifier (8), is provided sound source signal by wireless zoned address signal transmitter module (12), and then to classroom audio amplifier and outdoor sound column (6), provides audio power signal by power amplifier;
Described Receiving Host (3) comprises reception power module (31), the first receipt decoding module (32), photoelectric isolation module (33), manual control module (34), external trigger control module (35), indicating module (37) and the relay Executive Module (36) that are connected with reception power module (31); Described the first receipt decoding module (32) comprises receiver module and single chip control module; The first receipt decoding module (32) is by receiving the control signal of subregion and sound column (6) that power supply clock signal is respectively used to control partition and the power supply of power amplifier (8); Described relay Executive Module (36) is comprised of triode and relay; Described photoelectric isolation module (33) carries out electrical isolation by a plurality of optocouplers by the first receipt decoding module (32), single chip control module and relay; Described manual control module (34) is comprised of a plurality of self-lock switchs, and described self-lock switch is used for controlling described relay; Described external trigger module (35) is for controlling other Broadcasting Control modes except described sub-control main frame;
Described radio receiving terminal (4) comprises wireless receiving power module (41), the second receipt decoding module (42), partition address code setting module (43), divisional signal gating module (44), photoelectric isolation module (45) and the relay Executive Module (46) that are connected with wireless receiving power module (41); Described radio receiving terminal (4) is received the subregion addressing radiofrequency signal that the wireless zoned address signal transmitter module of described sub-control main frame sends and is decoded the subregion control signal containing address by the second receipt decoding module (42);
Described the first receipt decoding module (32) is consistent with the operation principle of the second receipt decoding module (42);
Described repeat circuit (3) is connected with described sub-control main frame, for amplifying the wireless signal of described sub-control main frame.
2. according to principal's radio call broadcast work station claimed in claim 1, it is characterized in that: described the first receipt decoding module (32) and the second receipt decoding module (42) form by switch, diode OR gate road.
3. according to principal's radio call broadcast work station claimed in claim 1, it is characterized in that: described operation push-button (16) is alone button.
4. according to principal's radio call broadcast work station claimed in claim 1, it is characterized in that: described operation push-button (16) is multiplexing button, and multiplexing key function is realized by Single Chip Microcomputer (SCM) program.
5. according to principal's radio call broadcast work station claimed in claim 1, it is characterized in that: the audio frequency output voltage effective value of described audio-frequency module (14) is greater than 5V, and sound output is greater than 1W.
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| CN111193875A (en) * | 2018-11-15 | 2020-05-22 | 无锡人人行拍网络科技有限公司 | High-definition digital image transmission system receiving end of traversing machine |
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| CN104092507B (en) | 2017-02-15 |
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