CN202059535U - Intelligent management system of active speaker - Google Patents
Intelligent management system of active speaker Download PDFInfo
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- CN202059535U CN202059535U CN2011201427557U CN201120142755U CN202059535U CN 202059535 U CN202059535 U CN 202059535U CN 2011201427557 U CN2011201427557 U CN 2011201427557U CN 201120142755 U CN201120142755 U CN 201120142755U CN 202059535 U CN202059535 U CN 202059535U
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Abstract
The utility model discloses an intelligent management system of an active speaker, which comprises an analog signal input interface unit, a DSP (digital signal processor), a power amplifier unit, a voltage detection unit, a temperature detection and fan control unit, a digital signal input interface unit, an RMS (root-mean-square) and speaker impedance detection unit, and a network interface unit, wherein the analog signal input interface unit is used for converting balanced transmission analog audio signal into non-balanced transmission analog audio signal; he DSP (digital signal processor) is used for carrying out EQ (electrical quadrupole) regulation, delay, amplitude limiting and fractional frequency operation on the analog audio signal input by the analog signal input interface unit, and realizing automatic switching between the analog audio signal and the digital audio signal; the power amplifier unit is used for driving a plurality of active speakers to give out sound; the voltage detection unit is used for detecting the power supply voltage at the power supply input end of the power amplifier unit; the temperature detection and fan control unit is used for detecting the temperature in an active sound box, and automatically regulating the rotating speed of the sound box fan according to the detected temperature; the digital signal input interface unit is used for converting standard AES/EBU digital audio signal into the format of 12S; the RMS and speaker impedance detection unit is used for detecting the RMS value of the output end of the power amplifier unit and the impedance value of the active speaker; and the network interface unit is used for receiving TCP (transmission control protocol) /IP (internet protocol) data from an internet or launching TPC/IP to the internet.
Description
Technical field
The utility model relates to a kind of active loudspeaker management system; specifically; relate to and a kind ofly realize that the automatic switchover of analog/digital input signal, overvoltage protect automatically, adjust radiator fan speed according to temperature value automatically, thereby improve the active loudspeaker intelligent management system of the job stability of active loudspeaker.
The background colour technology
Active loudspeaker need use mains-supplied, and in actual use, civil power may bigger voltage fluctuation occur because electrical network is unstable, be easy to cause the active loudspeaker job insecurity like this, even overvoltage damages; In addition, the thermal losses meeting of power amplifier causes temperature rising in the casing in the active loudspeaker, and this can influence the stability of speaker operation conversely again; Also have, for to performing safe consideration, can adopt the scheme of simulation and digital audio system backup usually in the large-scale at the scene performance, and active loudspeaker generally only provides the analog input interface at present, and do not have digital interface, therefore active loudspeaker can't satisfy the requirement that audio frequency backs up at present; Have again, the loud speaker attendant needs regularly all loud speakers in the field to be detected and safeguard, can normally carry out when guaranteeing to perform, if finding active loudspeaker does not work, then need power supply state, signal link and signal level to investigate one by one to loud speaker, could judge the not reason of sounding of active loudspeaker, therefore in being furnished with the large-scale place of a plurality of active loudspeakers, finish investigation need of work a large amount of time of cost.
The utility model content
At above deficiency; the utility model provides a kind of can realize that the automatic switchover of analog/digital input signal, overvoltage protect automatically, adjust radiator fan speed according to temperature value automatically, and the active loudspeaker intelligent management system of Intelligent Measurement active loudspeaker operating state.It comprises that the simulated audio signal with balance transmission converts the analog input interface unit of Non-equilibrium Molecular Dynamics Simulation Study audio signal to; The simulated audio signal of described analog input interface unit input is carried out the digital signal processor DSP of EQ adjustment, time-delay, amplitude limit and divide operation; Be connected with described digital signal processor, be used to drive the power amplifier unit of several active loudspeakers SPEAKER1 ~ SPEAKERn sounding; Be used to detect the voltage detection unit of supply power voltage of the power input of described power amplifier unit; Control the main control unit of power amplifier unit operating state according to the supply power voltage of voltage detection unit detection.
It also comprises the temperature that detects in the active audio amplifier, and adjusts temperature detection and fan control unit, described temperature detection and the fan control unit connection main control unit of audio amplifier rotation speed of the fan automatically according to the temperature value that is detected.
It comprises that also the AES/EBU digital audio and video signals that is used for standard converts the I2S form to, and send into the digital signal input interface unit of described digital signal processor, described digital signal processor is realized the automatic switchover between simulated audio signal and the digital audio and video signals.
It also comprises and is used to detect the RMS value of power amplifier unit output and the resistance value of active loudspeaker SPEAKER1 ~ SPEAKERn, and detected RMS value and resistance value sent to the RMS and the loudspeaker impedance detecting unit of main control unit, described RMS and loudspeaker impedance detecting unit connect main control unit.
It also comprise be used for and the Internet between the network interface unit of transmitting-receiving TCP/IP data, described network interface unit connects main control unit.
Described main control unit is the unit machine that meets industrial standard.
Described unit machine adopts 32 control chip.
The beneficial effects of the utility model: active loudspeaker intelligent management system of the present utility model detects the supply power voltage of power amplifier unit power input by voltage detection unit; when supply power voltage overrate working range value; the operating voltage of automatic disconnection power amplifier unit is to realize the overvoltage automatic protection functions.In addition,, and adjust the audio amplifier rotation speed of the fan automatically, not only can save electric energy, can improve the stability of speaker operation simultaneously according to the temperature value that is detected by the temperature in temperature detection and the fan control unit monitoring active audio amplifier.Have again, convert the AES/EBU digital audio and video signals of standard to the I2S form by the digital signal input interface unit, and send in the described digital signal processor DSP, realize the automatic switchover between backing up of simulated audio signal and digital audio and video signals by DSP.At last, by RMS and the RMS value of loudspeaker impedance detecting unit monitoring power amplifier unit output and the resistance value of active loudspeaker SPEAKER1 ~ SPEAKERn, and detected RMS value and resistance value sent to main control unit, by the operating state of each active loudspeaker of main control unit intelligent monitoring, and the transmission that realizes TCP/IP data between main control unit and the Internet by network interface unit.
Description of drawings
Fig. 1 is the functional framework figure of active loudspeaker intelligent management system of the present utility model;
Fig. 2 is the circuit theory diagrams of digital signal input interface unit of the present utility model;
Fig. 3 is the circuit theory diagrams of analog input interface of the present utility model unit;
Fig. 4 is the circuit theory diagrams of digital signal processor of the present utility model;
Fig. 5 is the circuit theory diagrams of power amplifier unit of the present utility model;
Fig. 6 is the circuit theory diagrams of voltage detection unit of the present utility model;
Fig. 7 is the circuit theory diagrams of RMS of the present utility model and loudspeaker impedance detecting unit;
Fig. 8 is the circuit theory diagrams of network interface unit of the present utility model;
Fig. 9 is the circuit theory diagrams of main control unit of the present utility model;
Figure 10 is the circuit theory diagrams of temperature detection of the present utility model and fan control unit.
Embodiment
Below in conjunction with accompanying drawing the utility model is further set forth.
As shown in Figure 1, active loudspeaker intelligent management system native system of the present utility model is made up of digital signal input interface unit 1, analog input interface unit 2, digital signal processor 3, power amplifier unit 4, voltage detection unit 5, RMS and loudspeaker impedance detecting unit 6, network interface unit 7, main control unit 8 and temperature detection and fan control unit 9, wherein, digital signal input interface unit 1 links to each other with the digital interface of digital signal processor 3, and the AES/EBU digital audio and video signals of standard is converted to the I2S form and sends into digital signal processor 3; Analog input interface unit 2 links to each other with the analog interface of digital signal processor 3, and the simulated audio signal of balance transmission is converted to the Non-equilibrium Molecular Dynamics Simulation Study audio signal and sends into digital signal processor 3; Digital signal processor 3 can carry out EQ adjustment, time-delay, amplitude limit and divide operation to audio signal simultaneously by the automatic switchover between program control realization simulated audio signal and the digital audio and video signals backup, makes loud speaker reach best operating state; The simulation output interface of digital signal processor 3 links to each other with the analog input interface of power amplifier unit 4, and the signal of handling is sent into power amplifier unit 4; The control interface of digital signal processor 3 links to each other with main control unit 8, receives the control data from main control unit 8, and the state information of digital audio and video signals and simulated audio signal is sent to main control unit 8; Power amplifier unit 4 outputs link to each other with SPEAKER1 ~ SPEAKERn, drive SPEAKER1 ~ SPEAKERn sounding; Power amplifier unit 4 outputs link to each other with RMS and loudspeaker impedance detecting unit 6; Voltage detection unit 5 links to each other with the power input of power amplifier unit 4, detected supply power voltage value is sent to main control unit 8, when detecting supply power voltage and exceed working range, cut off amplifier power supply automatically with the protection power amplifier, 8 pairs of supply power voltages of main control unit are added up, and draw the fluctuation situation of electrical network by programmed algorithm; RMS and loudspeaker impedance detecting unit 6 link to each other with output and SPEAKER1, the SPEAKER2 of power amplifier unit 4, RMS value to the power amplifier output detects, and the impedance to SPEAKER1 ~ SPEAKERn detects before power amplifier work, and the resistance value of RMS value and SPEAKER1 ~ SPEAKERn is sent to main control unit 8; Network interface unit 7 links to each other with main control unit 8, makes main control unit 8 can receive and dispatch the TCP/IP data on network; Network interface unit 7 has the 10M/100M adaptation function, has switch function, can realize the networking of fast and flexible; Temperature in 9 pairs of active audio amplifiers of temperature detection and fan control unit detects, and adjusts rotation speed of the fan automatically according to temperature value, simultaneously temperature data and rotary speed data is sent to main control unit 8.Main control unit 8 adopts the single-chip microcomputer that meets industrial standard, adopt the kernel control chip of 32 high performance-price ratio single-chip microcomputers as system, focus on from digital signal processor 3, voltage detection unit 5, RMS and loudspeaker impedance detecting unit 6, the state of network interface unit 7 and temperature detection and fan control unit 9 and control data, realize the automatic switchover of AES/EBU digital audio and video signals and simulated audio signal input by programmed algorithm control figure signal processor 3, adjust digital signal processor 3 parameters, the action of control power amplifier power supply circuits 4, and pass through network interface unit 7 the AES/EBU signal condition, the simulated audio signal state, the supply power voltage value, power amplifier output RMS value, the loudspeaker impedance value, temperature value, the rotation speed of the fan value, voltage ripple of power network statistics and working temperature statistics are sent to the terminal on the network and are presented on the screen, realize unified management.
Specific implementation to each unit is described below:
Fig. 2 is the circuit theory diagrams of digital signal input interface unit, you interface J1 of three core Ka receives the standard A ES/EBU audio signal from sound console or other audio frequency apparatuses, be sent to AES conversion chip U1 through transformer T1, U1 converts the AES/EBU audio format of standard to the I2S form, and is sent to the interface J5 of digital signal processor 3 by interface J2; The clock signal of active crystal oscillator OSC_AES1 generation 12.288MHz offers the OMCK pin of U1, and U1 is routed to the clock signal on the OMCK on the RMCK pin and outputs to the J2 interface and offers digital signal processor 3 uses.
Fig. 3 is the circuit theory diagrams of analog input interface unit, and three core Ka you interface J16, J18 receive from the simulated audio signal of sound console or other audio frequency apparatuses and deliver to the J3 interface that balance/unbalance conversion chip U15, U16 become non-equilibrium audio signal to the Balanced Audio conversion of signals and be sent to digital signal processor 3 through J17.
Fig. 4 is the circuit theory diagrams of digital signal processor, interface J3 is connected with the interface J17 of analog input interface unit 2, the simulated audio signal that receives is delivered to ADC interface ADC0, the ADC1 of DSP chip U3 and be converted into the number format data that are fit to the digital signal processor computing; Interface J5 is connected with the interface J2 of digital signal input interface unit 1, the audio signal of the I2S form that receives is delivered to digital input interface MP0, MP4, the MP5 of U3; Interface J6 is connected with the interface J11 of main control unit 8, receives and sends to main control unit 8 from the control signal of main control unit 8 and the state of audio signal by MP10, MP11; U3 judges to simulated audio signal and the digital audio and video signals of input that by program if wherein one the tunnel do not have signal then to automatically switch to another road, the while sends to main control unit 8 to signal condition; U3 delivers to DAC to the number format audio signal after handling and converts simulated audio signal to, and delivers to the output buffer of being made up of U2; The output buffer of forming by U2 audio signal output to interface J4 and be connected to the interface J24 of power amplifier unit 4.
Fig. 5 is the circuit theory diagrams of power amplifier unit, and AMP1 is power amplifier unit independently, has 2 road I/O channels; Interface J21 is connected with the interface J14 of voltage detection unit 5, the power supply of AC220V is delivered to power interface ACIN1, ACIN2, the EARTH of AMP1; Interface J24 is connected with the interface J4 of digital signal processor 3, the simulated audio signal that receives is delivered to input interface INL and the INR of AMP1; After AMP1 carries out power amplification to input signal, output to the J23, the J25 that are connected with SPEAKER1, SPEAKER2 through output interface OUTL with OUTR and output to the interface J22 that is connected with the interface J12 of RMS and loudspeaker impedance detecting unit 6 simultaneously.
Fig. 6 is the circuit theory diagrams of voltage detection unit, and three core power connection P1 are electrically connected with the city, and civil power is delivered to the interface J14 that is connected with the interface J21 of time module 4 through open type high power relay K3 with K4; Transformer T2 is line voltage AC220V step-down AC6V, through the U10 rectification and through becoming sampling voltage Vs_out after R35, the R36 dividing potential drop, Vs_out outputs to the interface J15 that is connected with the interface J10 of main control unit 8, delivers to the input of the overvoltage automatic protection circuit of being made up of voltage comparator U11, reference power source chip U12, U14 and rest-set flip-flop U13 simultaneously; The overvoltage automatic protection circuit of forming as U11, U12, U14 and U13 drives the pin Q output low level of U13B when detecting sampling voltage Vs_out and exceeding preset value, by diode D3 the base potential of triode Q4, Q5 is dragged down, make Q4, Q5 by, cut off the electricity supply thereby relay switch is disconnected; Interface J15 is connected with the interface J10 of main control unit 8, when main control unit 8 detects sampling voltage Vs_out and is in normal range (NR), drive respective pins output high level, and provide bias voltage for Q4, Q5 by R33, this moment is if the automatic protection circuit output pin is a high level, then Q4, Q5 conducting, thus make relay K 3, K4 adhesive, and energized is powered to power amplifier unit; Main control unit 8 is added up sampling voltage Vs_out by programmed algorithm, can draw the statistics of voltage ripple of power network situation, finally statistical report is outputed to computer monitoring terminal,, can point out the attendant that electrical network is safeguarded if power network fluctuation is too big.
Fig. 7 is the circuit theory diagrams of RMS and loudspeaker impedance detecting unit, interface J12 is connected with the interface J22 of power amplifier unit 4, the audio signal of power amplifier output is delivered to the scale operation circuit that is made of amplifier U8 through double-throw relay K 1, enter the input of real effective conversion chip U9 after signal is scaled, after U9 carries out computing to signal, the RMS value of signal is converted to corresponding dc voltage value and outputs to interface J13 through the BUFOUT pin; Interface J13 is connected with the interface J9 of main control unit 8, the conducting of main control unit by driving respective pins control Q2, Q3 with by, thereby the on off state of control relay K1, K2; In the time will measuring the RMS value of power amplifier left side output channel OUTL, make K1 be connected to the pin 1 of J12, the pin 6 of main control unit 8 by the J13 magnitude of voltage after the U9 conversion that reads back passes through the RMS value that arrives actually after the computing; In the time will measuring the impedance of SPEAKER1, control K3, K4 disconnects earlier, cut off the power supply of power amplifier unit, controlling K1 again links to each other with J12 pin 1, control K2 closure, specific voltage value of pin output that control links to each other with the pin 2 of J13, this voltage is connected with loudspeaker unit to be measured through reference resistance R30, main control unit just can obtain the dc impedance of to-be-measured cell from the pin 3 of the J13 magnitude of voltage that reads back through computing.
Fig. 8 is the circuit theory diagrams of network interface unit, and U17 is the network router chip with MII interface, has 10M/100M adaptive switch function, and it is connected with the interface J8 of main control unit 8 by interface J19, realizes the exchanges data with main control unit 8; RJ1 and RJ2 are the network interface seat of band network transformer.
Fig. 9 is the circuit theory diagrams of main control unit, and U4 is 32 high performance-price ratio microcontrollers that have the MII interface, and it realizes exchanges data by interface J8 and network interface unit 7; Communicate by interface J7 and temperature detection and fan control unit 9, obtain temperature and fan speed data, the output of control digital signal processor when temperature surpasses preset value, reduce the power output of power amplifier unit, with the protection loud speaker, and send heat alert to monitor terminal, simultaneously with certain hour nodes records loud speaker temperature and rotation speed of the fan situation by network, finally statistics is outputed to monitor terminal, for attendant's reference; Be connected with RMS and loudspeaker impedance detecting unit 6 by interface J9, obtain the RMS value of power amplifier output and the resistance value of loudspeaker unit, when system initialization, detect the loudspeaker impedance value earlier, resistance value with systemic presupposition compares then, when finding that impedance does not match, send the impedance mismatch alarm to monitor terminal, cause the problem that burns out the unit even burn out power amplifier to prevent the unit that inserts too small impedance, when the RMS value that detects power amplifier output is controlled the output of digital signal processor during greater than preset value, make power amplifier output RMS value return to normal range (NR), with protection power amplifier unit and loudspeaker unit; Be connected with the interface J15 of voltage detection unit 5 by interface J10, obtain the data of supply power voltage and the break-make of control relay K3, K4, thereby the break-make of control amplifier power supply, when detecting supply power voltage and exceed normal value, control relay K3, K4 disconnect, cut off amplifier power supply, and send the superpressure alarm to monitor terminal, write down the voltage data of electrical network simultaneously according to timing node, draw the fluctuation situation of line voltage by statistics, and the fluctuation situation sent to monitor terminal, remind the attendant that electrical network is safeguarded; Be connected with the interface J6 of digital signal processor 3 by interface J11, obtain the signal condition of simulated audio signal and digital audio and video signals, and the control figure signal processor is realized the automatic switchover of audio frequency backup signal, can revise simultaneously the parameter of digital signal processor according to user's demand, realize adjustment such as quiet, time-delay, EQ, volume; But U7 is an electric erasable formula memory device, is used for the default parameter of storage system and the modification parameter of register system, can call for the user.
Figure 10 is the circuit theory diagrams of temperature detection and fan control unit, and U18 is 8 8-digit microcontrollers, the velocity of rotation of the PWM fan that is connected with interface J_fan1 by program control, and pin PB0 detects the rotating speed of PWM fan simultaneously; By the temperature data of program control pin PD6, single line temperature integrated chip DS18B20 that PD7 reads to be connected with J_temp1, J_temp2, and temperature and fan speed data are sent to main control unit 8 by interface J20; U18 judges reading the temperature value of returning, and when temperature raises, the pwm signal pulsewidth of pin PB1 is increased, to increase rotation speed of the fan; When temperature descends, the pwm signal pulsewidth is reduced, to reduce rotation speed of the fan.
The above only is a better embodiment of the present utility model, the utility model is not limited to above-mentioned execution mode, in implementation process, may there be local small structural modification, if various changes of the present utility model or modification are not broken away from spirit and scope of the present utility model, and belong within claim of the present utility model and the equivalent technologies scope, then the utility model also is intended to comprise these changes and modification.
Claims (9)
1. active loudspeaker intelligent management system, it comprises
The simulated audio signal of balance transmission is converted to the analog input interface unit (2) of Non-equilibrium Molecular Dynamics Simulation Study audio signal;
The simulated audio signal of described analog input interface unit (2) input is carried out the digital signal processor (3) of EQ adjustment, time-delay, amplitude limit and divide operation;
Be connected with described digital signal processor (3), be used to drive the power amplifier unit (4) of several active loudspeakers SPEAKER1 ~ SPEAKERn sounding,
It is characterized in that, it also comprises the voltage detection unit (5) of the supply power voltage of the power input that is used to detect described power amplifier unit (4), and the main control unit (8) of supply power voltage control power amplifier unit (4) operating state that detects according to voltage detection unit (5).
2. active loudspeaker intelligent management system according to claim 1, it is characterized in that, it also comprises the temperature that detects in the active audio amplifier, and adjust the temperature detection and the fan control unit (9) of audio amplifier rotation speed of the fan automatically according to the temperature value that is detected, described temperature detection and fan control unit (9) connect main control unit (8).
3. active loudspeaker intelligent management system according to claim 1 and 2, it is characterized in that, it comprises that also the AES/EBU digital audio and video signals that is used for standard converts the I2S form to, and send into the digital signal input interface unit (1) of described digital signal processor (3), described digital signal processor (3) is realized the automatic switchover between simulated audio signal and the digital audio and video signals.
4. active loudspeaker intelligent management system according to claim 1 and 2, it is characterized in that, it also comprises and is used to detect the RMS value of power amplifier unit (4) output and the resistance value of active loudspeaker SPEAKER1 ~ SPEAKERn, and detected RMS value and resistance value sent to the RMS and the loudspeaker impedance detecting unit (6) of main control unit (8), described RMS and loudspeaker impedance detecting unit (6) connect main control unit (8).
5. active loudspeaker intelligent management system according to claim 3, it is characterized in that, it also comprises and is used to detect the RMS value of power amplifier unit (4) output and the resistance value of active loudspeaker SPEAKER1 ~ SPEAKERn, and detected RMS value and resistance value sent to the RMS and the loudspeaker impedance detecting unit (6) of main control unit (8), described RMS and loudspeaker impedance detecting unit (6) connect main control unit (8).
6. active loudspeaker intelligent management system according to claim 4 is characterized in that, it also comprise be used for and the Internet between the network interface unit (7) of transmitting-receiving TCP/IP data, described network interface unit (7) connects main control unit (8).
7. active loudspeaker intelligent management system according to claim 5 is characterized in that, it also comprise be used for and the Internet between the network interface unit (7) of transmitting-receiving TCP/IP data, described network interface unit (7) connects main control unit (8).
8. according to claim 6 or 7 described active loudspeaker intelligent management systems, it is characterized in that described main control unit (8) is for meeting the unit machine of industrial standard.
9. active loudspeaker intelligent management system according to claim 8 is characterized in that, described unit machine adopts 32 control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201427557U CN202059535U (en) | 2011-05-06 | 2011-05-06 | Intelligent management system of active speaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201427557U CN202059535U (en) | 2011-05-06 | 2011-05-06 | Intelligent management system of active speaker |
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| CN202059535U true CN202059535U (en) | 2011-11-30 |
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| CN2011201427557U Expired - Lifetime CN202059535U (en) | 2011-05-06 | 2011-05-06 | Intelligent management system of active speaker |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102202252A (en) * | 2011-05-06 | 2011-09-28 | 广州励丰声光科技有限公司 | Intelligent management system of active loudspeakers |
| WO2013112039A1 (en) * | 2012-01-27 | 2013-08-01 | Munoz Palafox Carlos Fernando | Playback system for electric guitar, with high-fidelity sound and microcontroller-assisted protection means |
| CN105635902A (en) * | 2014-11-04 | 2016-06-01 | 中兴通讯股份有限公司 | Audio interface compatible with digital audio device and implementation method |
| CN110337051A (en) * | 2019-05-14 | 2019-10-15 | 南宁职业技术学院 | Audio amplification device and audio amplification method |
-
2011
- 2011-05-06 CN CN2011201427557U patent/CN202059535U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102202252A (en) * | 2011-05-06 | 2011-09-28 | 广州励丰声光科技有限公司 | Intelligent management system of active loudspeakers |
| CN102202252B (en) * | 2011-05-06 | 2014-09-24 | 广州励丰文化科技股份有限公司 | Intelligent management system of active loudspeakers |
| WO2013112039A1 (en) * | 2012-01-27 | 2013-08-01 | Munoz Palafox Carlos Fernando | Playback system for electric guitar, with high-fidelity sound and microcontroller-assisted protection means |
| CN105635902A (en) * | 2014-11-04 | 2016-06-01 | 中兴通讯股份有限公司 | Audio interface compatible with digital audio device and implementation method |
| CN110337051A (en) * | 2019-05-14 | 2019-10-15 | 南宁职业技术学院 | Audio amplification device and audio amplification method |
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| C56 | Change in the name or address of the patentee |
Owner name: GUANGZHOU LEAFUN CULTURE CO., LTD. Free format text: FORMER NAME: LEIFULL LIGHT + SOUND TECHNOLOGY CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 885 A410 room, Shenzhou Road, Science Town, Guangzhou hi tech Industrial Development Zone, Guangdong 510663, China Patentee after: Guangzhou Li Feng culture Limited by Share Ltd Address before: 885 A410 room, Shenzhou Road, Science Town, Guangzhou hi tech Industrial Development Zone, Guangdong 510663, China Patentee before: Guangzhou Leafun Acoustic-Optic Technology Co.,Ltd. |
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| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 885 A410 room, Shenzhou Road, Science Town, Guangzhou hi tech Industrial Development Zone, Guangdong 510663, China Patentee after: Guangzhou Leafun Culture Technology Co., Ltd. Address before: 885 A410 room, Shenzhou Road, Science Town, Guangzhou hi tech Industrial Development Zone, Guangdong 510663, China Patentee before: Guangzhou Li Feng Culture Technology Co., Ltd. |
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Granted publication date: 20111130 |