CN101009950A - A continuous-processing blind separation device for the mixed audio - Google Patents
A continuous-processing blind separation device for the mixed audio Download PDFInfo
- Publication number
- CN101009950A CN101009950A CN 200610132468 CN200610132468A CN101009950A CN 101009950 A CN101009950 A CN 101009950A CN 200610132468 CN200610132468 CN 200610132468 CN 200610132468 A CN200610132468 A CN 200610132468A CN 101009950 A CN101009950 A CN 101009950A
- Authority
- CN
- China
- Prior art keywords
- passage
- circuit
- electrically connected
- decoding
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The disclosed continual-process mixed audio blind separation device comprises: a shell, a built-in circuit board, and a horn sound box, wherein on the shell panel, there is an input socket for mixed audio signal, a mode indicator for separation output, a horn socket, and a system reset button. This invention separates two mixed signal to output independently for display.
Description
Technical field
The present invention relates to the blind signal separation technical field, particularly the blind separating treatment The Application of Technology of mixed audio signal specifically is meant a kind of continuous processing formula mixed audio blind separation device.
Background technology
The blind signal separation theory is one of the popular research topic in current signal processing field, refer under the situation of not knowing concrete information source and channel, under promptly so-called " blind " state, the mixed signal (being called Blind Source) of only utilizing information source and being produced, by corresponding processing, just can separate source signal separately (calling blind separation).This theory has very application prospects.Yet, the application study of blind signal separation theory and effect demonstration still are in the software emulation stage of computer mostly, what consider all is Utopian experimental condition and environment, and restriction because of processing speed in the machine, the mixed signal input of demonstration can only segmentation and is intermittently carried out, and does not see off line demonstration and the real-time application apparatus realized by hardware circuit.
Summary of the invention
Purpose of the present invention is exactly in order to solve above-mentioned the deficiencies in the prior art part, and a kind of continuous processing formula mixed audio blind separation device is provided.But this device is realized off line demonstration and the Blind Signal Separation of handling in real time by hardware circuit, can separate continuously two kinds of mixed audio signals, respectively separately audio signal of independent output, play in real time by loudspeaker separately.
Purpose of the present invention is achieved through the following technical solutions: described a kind of continuous processing formula mixed audio blind separation device, comprise that casing and internal circuit board and Horn loudspeaker box connect and compose jointly, the panel of described casing is provided with the mixed audio signal input socket, separates the output services status indicator lamp, separates output loudspeaker socket, system reset pad, and respectively with internal circuit board on the circuit respective point be electrically connected mutually.
In order to realize the present invention better, circuit on the described internal circuit board comprises that passage 1 mixes the input audio amplifier circuit, passage 1 serial code/decoding/filter circuit, passage 1 negative voltage generation circuit, passage 1 separates the output audio power amplification circuit, passage 2 mixes the input audio amplifier circuit, passage 2 serial code/decoding/filter circuits, passage 2 negative voltage generation circuit, passage 2 separates the output audio power amplification circuit, digital signal processing circuit, the operating state indicating circuit, system reset circuit, system emulation debugging interface and supply power voltage type conversion circuit are electrically connected formation jointly, its interconnected relationship is: described passage 1 serial code/decoding/filter circuit mixes input audio amplifier circuit holding wire by passage 1, passage 1 negative voltage generation circuit signal line, passage 1 separates output audio power amplification circuit holding wire and mixes the input audio amplifier circuit respectively with passage 1, passage 1 negative voltage generation circuit, passage 1 separates the output audio power amplification circuit and is electrically connected mutually, described passage 2 serial code/decoding/filter circuits mix input audio amplifier circuit holding wire by passage 2, passage 2 negative voltage generation circuit signal lines, passage 2 separates output audio power amplification circuit holding wire and mixes the input audio amplifier circuit respectively with passage 2, passage 2 negative voltage generation circuit, passage 2 separates the output audio power amplification circuit and is electrically connected mutually, and described digital signal processing circuit is by passage 1 serial code/decoding/filter circuit holding wire, passage 2 serial codes/decoding/filter circuit holding wire, operating state indicating circuit holding wire, the system reset circuit holding wire, system emulation debugging interface holding wire, supply power voltage type conversion circuit signal line respectively with passage 1 serial code/decoding/filter circuit, passage 2 serial code/decoding/filter circuits, the operating state indicating circuit, system reset circuit, the system emulation debugging interface is electrically connected mutually with supply power voltage type conversion circuit.
The present invention compared with prior art has following advantage and beneficial effect:
1, the present invention has realized the blind separating treatment of mixed audio signal by hardware circuit.
2, the real-time separation that can import continuously two kinds of mixed audio signals of the present invention is play demonstration by loudspeaker separately.
3, the present invention is small and exquisite portable, makes the application demonstration energy divorced from computer equipment of Blind Signal Separation theory and the aspect of software emulation thereof.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a circuit block diagram of the present invention;
Fig. 3 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is done detailed description further, but embodiments of the present invention are not limited to this.
As shown in Figure 1, the panel of casing 1 is provided with passage 1 mixed audio signal input socket 2, passage 2 mixed audio signal input sockets 3, passage 2 to be separated output services status indicator lamps 4, passage 1 and separates that output services status indicator lamp 5, system reset pad 6, passage 1 separate output loudspeaker socket 7, passage 2 separates output loudspeaker sockets 8, direct current supply lead-in 13, Horn loudspeaker box 11 and 12 lead-in 9 with 10 respectively with panel on the output loudspeaker socket 7 of separating be connected with 8.
As shown in Figure 2, operation principle of the present invention is: two kinds of mixed audio analog signals need separating deliver to passage 1 mixing input audio amplifier circuit 14 simultaneously respectively and passage 2 mixing input audio amplifier circuits 18 carry out processing and amplifying, passage 1 serial code/decoding/filter circuit 15 and passage 2 serial codes/decoding/filter circuit 19 that output signal after amplifying is delivered to respectively separately carry out A-D (analog to digital) conversion and Filtering Processing, then the hybrid digital signal that obtains are delivered to digital signal processing circuit 22 and carry out the audio frequency separating treatment; Passage 1 negative voltage generation circuit 16 and passage 2 negative voltage generation circuit 20 provide the negative sense supply power voltage of passage 1 serial code/decoding/filter circuit 15 and passage 2 serial codes/decoding/filter circuit 19 respectively; Two kinds of digital signals separating independently are transmitted back to passage 1 serial code/decoding/filter circuit 15 respectively to digital signal processing circuit 22 and passage 2 serial codes/decoding/filter circuit 19 carries out D-A (digital-to-analog) conversion process, then the independent audio analog signal that obtains is outputed to separately passage 1 respectively and separate output audio power amplification circuit 17 and separate output audio power amplification circuit 21, play back from separately loudspeaker with passage 2; Meanwhile, digital signal processing circuit 22 is by the indicator light display channel 1 serial code/decoding/filter circuit 15 of operating state indicating circuit 23 and the operating state of passage 2 serial codes/decoding/filter circuit 19; System reset circuit 24 can make the operating state of digital signal processing circuit 22 start anew; In the system debug stage, outer computer can be by the input of 25 pairs of digital signal processing circuits of system emulation debugging interface, 22 realization programs, debugging and control; Supply power voltage type conversion circuit 26 provides digital signal processing circuit 22 needed various operating voltages.
As shown in Figure 3, passage 1 mixes the input audio amplifier circuit and comprises that integration member U1, mixed signal input socket J1, resistance R 1～R7, capacitor C 1～C5 are electrically connected formation jointly; Passage 1 serial code/decoding/filter circuit comprises that integration member U3, resistance R 8, R9, capacitor C 6, C7 are electrically connected formation jointly; Passage 1 negative voltage generation circuit comprises that integration member U5, capacitor C 8, C9 are electrically connected formation jointly; Passage 1 separates the output audio power amplification circuit and comprises that integration member U7, resistance R-1, R10, capacitor C 10～C14, loudspeaker SP1 are electrically connected formation jointly; Passage 2 mixes the input audio amplifier circuit and comprises that integration member U2, mixed signal input socket J2, resistance R 11～R17, capacitor C 15～C19 are electrically connected formation jointly; Passage 2 serial code/decoding/filter circuits comprise that integration member U4, resistance R 18, R19, capacitor C 20, C21 are electrically connected formation jointly; Passage 2 negative voltage generation circuit comprise that integration member U6, capacitor C 22, C23 are electrically connected formation jointly; Passage 2 separates the output audio power amplification circuit and comprises that integration member U8, resistance R-2, R20, capacitor C 24～C28, loudspeaker SP2 are electrically connected formation jointly; Digital signal processing circuit comprises that integration member U9, crystal oscillator CY, capacitor C 29, C30 are electrically connected formation jointly; The operating state indicating circuit comprises that LED 1, LED2, resistance R 21, R22 are electrically connected formation jointly; System reset circuit comprises that key switch SW, resistance R 23, capacitor C 31 are electrically connected formation jointly; The system emulation debugging interface comprises that reference format JTAG socket J3 is electrically connected formation; Supply power voltage type conversion circuit comprises that three-terminal voltage-stabilizing integration member U10, U11, capacitor C 32～C38 are electrically connected formation jointly.
Circuit working principle of the present invention is: separated two kinds of mixed audio signals simultaneously respectively from J1 and and J2 enter, through C1 and C15 every directly, R2, C3 and R12, C17 filtering, send the negative input of operational amplifier U1 and U2 to, the positive input reference voltage of U1 and U2 is provided by R3, R4 and R13, R14 dividing potential drop, R6, C4 and R16, C18 feedback loop are determined the amplification quantity of U1 and U2, make the signal enlargement range of U1 and U2 reach consistent; Hybrid analog-digital simulation signal after the amplification respectively through C5 and C19 every straight, R7 and R17 current limliting, deliver to separately serial code/decoding/filtering integration member U3 and the forward-chaining input VFXI+ of U4, and R9, R8 and R19, R18 are as the feedback loop of negative input VFXI-; The clock signal of serial clock input BCLKX and MCLKX is held from CLKX1, CLKR1 and CLKX0, the CLKR0 of Digital Signal Processing integration member U9 respectively, and hold FSX1, FSX0 to provide the transmit frame synchronizing signal to the FSR of U1, U2 end respectively synchronously by the transmit frame of Digital Signal Processing integration member U9, the received frame of U9 holds FSR1, FSR0 to provide the received frame synchronizing signal to the FSX of U1, U2 end respectively synchronously, realizes the signal transmitting and receiving control of U9 to U3, U4; The serial data that U3, U4 send to U9 is to export, deliver to respectively serial data receiving terminal DR1 and the DR0 of U9 from serial data transmitting terminal DX, and the serial data that the serial data receiving terminal DR of U3, U4 receives from U9 to be serial data transmitting terminal DX1 and DX0 by U9 send, realize the serial data transmission between U3, U4 and the U9; Integration member U5 and U6 produce and the corresponding negative voltage of positive voltage VCC, deliver to the negative voltage input VBB of U3 and U4 respectively from output OUT, and U3 and U4 are provided required negative sense operating voltage; The mixed audio signal of sending into from VFXI+ carries out A-D (analog to digital) signal transformation processing at U3 and U4 inside respectively, become the hybrid digital signal, under the control of the clock signal of U9 and serial synchronous control signal, deliver to serial data receiving terminal DR1 and the DR0 of U9 respectively from serial data transmitting terminal DX, carry out the separating treatment of hybrid digital signal in U9 inside, become two kinds of independently digital audio and video signals, again under the control of the clock signal of U9 and serial synchronous control signal, be transmitted back to the serial data receiving terminal DR of U3 and U4 respectively from serial data transmitting terminal DX1 and DX0; Independently digital audio and video signals carries out D-A (digital-to-analog) signal processing and corresponding Filtering Processing at U3 and U4 inside respectively, become two kinds of independently audio analog signals, export from analog signal output VFRO respectively then, and the audio power amplifying stage U7 and the U8 that deliver to separately carry out power amplification; Audio signal respectively from power amplification integration member U7 and U8+enter to input, R-1, C10 and R-2, C24 feedback loop are as amplification quantity control, R10, C11, C12, C14 and R20, C25, C26, C28 do signal filtering respectively, through the coupling of C13 and C27 audio signal, loudspeaker SP1 and SP2 by separately play back; Meanwhile, U9 controls the break-make of LED 1 and LED2 respectively by control port HD1 and HD2, makes it shinny when U3 and the separative audio signal output of U4, does not extinguish when having audio signal output, and the operating state indication of system is provided; When pressing button SW, low level is provided for the reset terminal RESET of U9, realizes system reset; J3 is a reference format JTAG artificial debugging interface, carries out system emulation debugging passage for outer computer provides with U9, realizes that outer computer is to the input of the program before the U9 offline operation, debugging and control; Three-terminal voltage-stabilizing integration member U10 and U11 utilize dc power supply VCC to produce required low-voltage DVDD and the CVDD of U9 work, and make power filter by C32～C38.
The inventor thinks and realizes that optimal way of the present invention can be through development test: by shown in Figure 1, design processing and manufacturing casing 1 for example, can select for use sheet plastic to be processed into the casing 1 of 180 * 100 * 40mm with adhesive bonding method (1); On the panel of casing 1, offer position, mixed audio signal input socket hole 2 and 3, separate position, output services status indicator lamp hole 4 and 5, output loudspeaker socket aperture position 7 and 8 is separated, position, direct current supply lead-in hole and power lead-ining line 13 thereof in position, system reset pad hole 6; In addition, be equipped with Horn loudspeaker box 11 and 12 and signal lead-in 9 and 10; (2) as one of embodiments of the invention, as shown in Figures 2 and 3, make internal circuit board, and behind the screening components and parts connection is installed, for example, integration member U1 and U2 can select the LM324 type for use, and U3 and U4 can select the TP3057 type for use, and U5 and U6 can select the MAX660 type for use, U7 and U8 can select the LM386 type for use, U9 can select the C6711 type for use, and U10 and U11 can select the LT1585 type for use, the optional 40MHZ type of crystal oscillator CY, the 2 watts of types in optional 8 Europe of loudspeaker SP1 and SP2, complete machine VCC utilizes the power supply of 5V power supply, and DVDD is 3.3V, and CVDD is 1.8V; Can carry out circuit board by Fig. 2, annexation shown in Figure 3 and recited above connection is installed, and be electrically connected, after installation connects circuit board, place in the casing, power up debugging, just can implement the present invention preferably with associated components.
Claims (10)
1, a kind of continuous processing formula mixed audio blind separation device, it is characterized in that, comprise that casing and internal circuit board and Horn loudspeaker box connect and compose jointly, the panel of described casing is provided with the mixed audio signal input socket, separates the output services status indicator lamp, separates output loudspeaker socket, system reset pad, and respectively with internal circuit board on the circuit respective point be electrically connected mutually.
2, a kind of continuous processing formula mixed audio blind separation device according to claim 1, it is characterized in that, circuit on the described internal circuit board comprises that passage 1 mixes the input audio amplifier circuit, passage 1 serial code/decoding/filter circuit, passage 1 negative voltage generation circuit, passage 1 separates the output audio power amplification circuit, passage 2 mixes the input audio amplifier circuit, passage 2 serial code/decoding/filter circuits, passage 2 negative voltage generation circuit, passage 2 separates the output audio power amplification circuit, digital signal processing circuit, the operating state indicating circuit, system reset circuit, system emulation debugging interface and supply power voltage type conversion circuit are electrically connected formation jointly, its interconnected relationship is: described passage 1 serial code/decoding/filter circuit mixes input audio amplifier circuit holding wire by passage 1, passage 1 negative voltage generation circuit signal line, passage 1 separates output audio power amplification circuit holding wire and mixes the input audio amplifier circuit respectively with passage 1, passage 1 negative voltage generation circuit, passage 1 separates the output audio power amplification circuit and is electrically connected mutually, described passage 2 serial code/decoding/filter circuits mix input audio amplifier circuit holding wire by passage 2, passage 2 negative voltage generation circuit signal lines, passage 2 separates output audio power amplification circuit holding wire and mixes the input audio amplifier circuit respectively with passage 2, passage 2 negative voltage generation circuit, passage 2 separates the output audio power amplification circuit and is electrically connected mutually, and described digital signal processing circuit is by passage 1 serial code/decoding/filter circuit holding wire, passage 2 serial codes/decoding/filter circuit holding wire, operating state indicating circuit holding wire, the system reset circuit holding wire, system emulation debugging interface holding wire, supply power voltage type conversion circuit signal line respectively with passage 1 serial code/decoding/filter circuit, passage 2 serial code/decoding/filter circuits, the operating state indicating circuit, system reset circuit, the system emulation debugging interface is electrically connected mutually with supply power voltage type conversion circuit.
3, a kind of continuous processing formula mixed audio blind separation device according to claim 2, it is characterized in that described passage 1 mixes the input audio amplifier circuit and comprises that integration member U1, mixed signal input socket J1, resistance R 1～R7, capacitor C 1～C5 are electrically connected formation jointly.
4, a kind of continuous processing formula mixed audio blind separation device according to claim 2 is characterized in that described passage 1 serial code/decoding/filter circuit comprises that integration member U3, resistance R 8, R9, capacitor C 6, C7 are electrically connected formation jointly; Described passage 1 negative voltage generation circuit comprises that integration member U5, capacitor C 8, C9 are electrically connected formation jointly.
5, a kind of continuous processing formula mixed audio blind separation device according to claim 2, it is characterized in that described passage 1 separates the output audio power amplification circuit and comprises that integration member U7, resistance R-1, R10, capacitor C 10～C14, loudspeaker SP1 are electrically connected formation jointly.
6, a kind of continuous processing formula mixed audio blind separation device according to claim 2, it is characterized in that described passage 2 mixes the input audio amplifier circuit and comprises that integration member U2, mixed signal input socket J2, resistance R 11～R17, capacitor C 15～C19 are electrically connected formation jointly.
7, a kind of continuous processing formula mixed audio blind separation device according to claim 2 is characterized in that described passage 2 serial code/decoding/filter circuits comprise that integration member U4, resistance R 18, R19, capacitor C 20, C21 are electrically connected formation jointly; Described passage 2 negative voltage generation circuit comprise that integration member U6, capacitor C 22, C23 are electrically connected formation jointly.
8, a kind of continuous processing formula mixed audio blind separation device according to claim 2, it is characterized in that described passage 2 separates the output audio power amplification circuit and comprises that integration member U8, resistance R-2, R20, capacitor C 24～C28, loudspeaker SP2 are electrically connected formation jointly.
9, a kind of continuous processing formula mixed audio blind separation device according to claim 2 is characterized in that described digital signal processing circuit comprises that integration member U9, crystal oscillator CY, capacitor C 29, C30 are electrically connected formation jointly.
10, a kind of continuous processing formula mixed audio blind separation device according to claim 2 is characterized in that described operating state indicating circuit comprises that LED 1, LED2, resistance R 21, R22 are electrically connected formation jointly; Described system reset circuit comprises that key switch SW, resistance R 23, capacitor C 31 are electrically connected formation jointly; Described system emulation debugging interface comprises that reference format JTAG socket J3 is electrically connected formation; Described supply power voltage type conversion circuit comprises that three-terminal voltage-stabilizing integration member U10, U11, capacitor C 32～C38 are electrically connected formation jointly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101324681A CN101009950B (en) | 2006-12-30 | 2006-12-30 | A continuous-processing blind separation device for the mixed audio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101324681A CN101009950B (en) | 2006-12-30 | 2006-12-30 | A continuous-processing blind separation device for the mixed audio |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101009950A true CN101009950A (en) | 2007-08-01 |
| CN101009950B CN101009950B (en) | 2010-11-03 |
Family
ID=38697988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101324681A Expired - Fee Related CN101009950B (en) | 2006-12-30 | 2006-12-30 | A continuous-processing blind separation device for the mixed audio |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101009950B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101203061B (en) * | 2007-12-20 | 2011-07-20 | 华南理工大学 | Method for parallel processing real time gathering mixed audio blindness separating unit |
| CN102404261A (en) * | 2011-10-08 | 2012-04-04 | 上海大学 | Blind separation device based on BPSK/QPSK/8QAM (binary phase shift keying/quaternary phase shift keying/8-quadrature amplitude modulation) modulation signal |
| CN101388733B (en) * | 2008-10-22 | 2012-12-05 | 华南理工大学 | Blind separation interference resistant base band processing device for communication system |
| CN108141688A (en) * | 2015-10-08 | 2018-06-08 | 高通股份有限公司 | From the audio based on channel to the conversion of high-order ambiophony |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW376504B (en) * | 1997-02-18 | 1999-12-11 | Pragmatic Designs Inc | System and method for embedding and extracting control signals for an electrically actuated device |
| KR100469919B1 (en) * | 2002-09-12 | 2005-02-21 | 주식회사 아이필소닉 | An Stereophonic Apparatus Having Multiple Switching Function And An Apparatus For Controlling Sound Signal |
-
2006
- 2006-12-30 CN CN2006101324681A patent/CN101009950B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101203061B (en) * | 2007-12-20 | 2011-07-20 | 华南理工大学 | Method for parallel processing real time gathering mixed audio blindness separating unit |
| CN101388733B (en) * | 2008-10-22 | 2012-12-05 | 华南理工大学 | Blind separation interference resistant base band processing device for communication system |
| CN102404261A (en) * | 2011-10-08 | 2012-04-04 | 上海大学 | Blind separation device based on BPSK/QPSK/8QAM (binary phase shift keying/quaternary phase shift keying/8-quadrature amplitude modulation) modulation signal |
| CN108141688A (en) * | 2015-10-08 | 2018-06-08 | 高通股份有限公司 | From the audio based on channel to the conversion of high-order ambiophony |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101009950B (en) | 2010-11-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101009950B (en) | A continuous-processing blind separation device for the mixed audio | |
| CN204256397U (en) | Intelligent electric appliance control system | |
| CN102904734A (en) | Network-based all-digital broadcasting system | |
| CN104253663A (en) | Train full-featured digital-analog hybrid intelligent broadcast control box | |
| CN203327219U (en) | Multifunctional wireless sound system | |
| CN204119245U (en) | A kind of train global function numerical model analysis intelligent broadcast control box | |
| CN102662359B (en) | Novel intelligent examination hall management system | |
| CN208538468U (en) | A kind of control buzzer issues the circuit of chord | |
| CN106647918A (en) | electrical equipment and control circuit thereof | |
| CN207603880U (en) | Combined box | |
| CN206021149U (en) | Carried on vehicle computer based on ARM RISC core processors | |
| CN109297145A (en) | Communication circuit, communication device and air conditioner | |
| CN211319056U (en) | Frequency converter debugging device | |
| CN209859589U (en) | Embedded multi-bus vehicle-mounted display control device | |
| CN205945765U (en) | Novel IP intelligence broadcast equipment | |
| CN209147367U (en) | Communication circuit, communication device and air conditioner | |
| CN202856758U (en) | Network-type all-digital broadcasting system | |
| CN201489633U (en) | Control host circuit for electrical fire module | |
| CN202955827U (en) | Three-line communication structure of indoor unit and outdoor unit of variable frequency air conditioner | |
| CN202305748U (en) | Testing device for remote control motherboard of distribution automation terminal | |
| CN206712898U (en) | A kind of Novel telephone adapter | |
| CN207008338U (en) | A kind of central controller integrates extension system | |
| CN219286026U (en) | Connecting device | |
| CN200941676Y (en) | Receiver having weather information broadcast function | |
| CN209462588U (en) | A kind of shutdown noise absorber and earphone, speaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101103 Termination date: 20101230 |