CN103152687B - A kind of loud speaker based on wireless network and sound pressure detection device - Google Patents
A kind of loud speaker based on wireless network and sound pressure detection device Download PDFInfo
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Abstract
The invention discloses a kind of loud speaker based on wireless network and sound pressure detection device, comprising: one or more loudspeaker detection unit, one or more acoustic pressure detecting unit and acoustic pressure detection control device; Described acoustic pressure detection control device connects loudspeaker detection unit and acoustic pressure detecting unit respectively by wireless network; Described loudspeaker detection unit and acoustic pressure detecting unit obtain sound field acoustic pressure and after digitlization, distribute real-time sound pressure information to described acoustic pressure detection control device by wireless network.The present invention changes sound pressure signal into digital signal from simulation owing to using flush bonding processor, and be sent to regional center by wireless network, thus the acoustic pressure detectability providing in real time, distribute for audio system, thus can realize more flexible, with better function, reliability is higher, manage simpler audio system, especially remarkable in medium-and-large-sized audio system.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of loud speaker based on wireless network and sound pressure detection device.
Background technology
Known loud speaker detects or audio system checkout gear, usually output current, the voltage of audio system final power amplifier is only detected, although thus accomplished continuous, real-time detectability, and there is the interface integrated with audio system, but whether the circuit that can detect at most loud speaker connects normal, the actual acoustic pressure that can not detect loud speaker exports.And known sound pressure detection device, usually adopt manually to detect separately, discontinuous, do not possess network-connectivity, be difficult to whole audio system integrated.
Along with the high speed development of wireless Internet of Things, wireless senser obtains in multiple field to be promoted on a large scale and uses.Wireless senser has feature below: have one and support IEE802.15.4 standard slow network interface, one with the flush bonding processor of transducer cooperating, small and exquisite volume and cheap cost, extremely low power consumption.
In an audio system, usual number of loudspeakers is maximum, and widely distributed, and the detection system of very low cost and power consumption successfully could detect loud speaker, and is easily accepted by a user.And the acoustic pressure of each loudspeaker unit only can be detected continuously, in real time, intactly can detect the state of an audio system.
In view of this, how to utilize that wireless senser realizes more comprehensively, more direct audio system detects becomes one of current developing direction.
Summary of the invention
The object of the present invention is to provide the loud speaker based on wireless network and sound pressure detection device.Incomplete to solve Loudspeaker Measuring System detectability of the prior art, the problem of the integrated difficulty of sound pressure detection device.
In order to achieve the above object, this invention takes following technical scheme:
Based on loud speaker and the sound pressure detection device of wireless network, wherein, comprising:
One or more loudspeaker detection unit, one or more acoustic pressure detecting unit and acoustic pressure detection control device; Described acoustic pressure detection control device connects loudspeaker detection unit and acoustic pressure detecting unit respectively by IEE802.15.4 wireless network; Described loudspeaker detection unit and acoustic pressure detecting unit obtain sound field acoustic pressure and after digitlization, distribute real-time sound pressure information to described acoustic pressure detection control device by IEE802.15.4 wireless network.
The described loud speaker based on wireless network and sound pressure detection device, wherein, described loudspeaker detection unit comprises flush bonding processor, pick-up, ultrasonic sensor and a support IEE802.15.4 standard wireless network interface; Described flush bonding processor connects pick-up, ultrasonic sensor and radio network interface.
The described loud speaker based on wireless network and sound pressure detection device, wherein, described loudspeaker detection unit is arranged on a speaker, and power end is connected on the audio driven circuit of loud speaker, for by the power taking of described audio driven circuit, and use low leakage capacitor storage of electrical energy.
The described loud speaker based on wireless network and sound pressure detection device, wherein, described acoustic pressure detecting unit comprises the radio network interface of flush bonding processor, pick-up and support IEE802.15.4 standard; Described flush bonding processor connects pick-up and radio network interface.
The described loud speaker based on wireless network and sound pressure detection device, wherein, described acoustic pressure detection control device comprises: flush bonding processor, at least one road audio input interface and a road audio output interface, the radio network interface supporting IEE802.15.4 standard and second network interface; Described flush bonding processor connects audio input interface, audio output interface, radio network interface and second network interface respectively.
The described loud speaker based on wireless network and sound pressure detection device, wherein, described second network interface is WIFI network interface or Ethernet interface.
Beneficial effect:
Acoustic pressure based on wireless senser of the present invention and loud speaker checkout gear, and adopt the low-speed wireless network technology composition based on IEE802.15.4 to measure network, because IEE802.15.4 slow network cost is low, power consumption is extremely low, and thus loudspeaker detection unit can be built in loudspeaker unit.Arrange an acoustic pressure detection control device at each regional area, this controller provides Ethernet at a high speed or WIFI network, and powerful disposal ability, solves wireless senser transmission speed low, the problem of computing capability deficiency simultaneously.Thus the coordination of large-scale audio system can be realized, and senior complex control implementation of strategies.Compared to conventional art, the present invention has more comprehensively, more direct audio system detectability, stronger flexibility, more function, and possesses similar cost and volume.
Accompanying drawing explanation
Fig. 1 the present invention is based on the acoustic pressure of wireless network and the system connection layout of loud speaker detection dress.
Fig. 2 is the audio system idle condition overhaul flow chart of Examples section of the present invention.
Fig. 3 is the audio system broadcast state-detection flow chart of Examples section of the present invention.
Fig. 4 is that the acoustic pressure of Examples section of the present invention detects transmission flow figure.
Embodiment
For making object of the present invention, technical scheme and effect clearly, clearly, referring to accompanying drawing examples, the present invention is described in more detail.
Refer to Fig. 1, it is the system connection layout that the acoustic pressure based on wireless network of the present invention and loud speaker detect dress.As shown in the figure, the described loud speaker based on wireless network and sound pressure detection device comprise:
In one or more loudspeaker detection unit 100, one or more acoustic pressure detecting unit 200 and acoustic pressure detection control device 300(figure, the number of loudspeaker detection unit 100 and one or more acoustic pressure detecting unit 200 is only used to signal); Described acoustic pressure detection control device 300 connects loudspeaker detection unit 100 and acoustic pressure detecting unit 200 respectively by IEE802.15.4 wireless network; Described loudspeaker detection unit 100 and acoustic pressure detecting unit 200 obtain sound field acoustic pressure and after digitlization, distribute real-time sound pressure information to described acoustic pressure detection control device 300 by IEE802.15.4 wireless network.
Specifically, in an embodiment of the present invention, described wireless network is the low-speed wireless network based on IEEE802.15.4 standard, compared with the fast wireless network based on IEEE802.11 standard, one of its power consumption percentage being only the latter, cost is only the latter's 1/10th.
Described loudspeaker detection unit 100 is for detecting loud speaker, and in an embodiment of the present invention, it comprises the radio network interface of flush bonding processor, pick-up, ultrasonic sensor and a support IEE802.15.4 standard; Described flush bonding processor connects pick-up, ultrasonic sensor and radio network interface.Described acoustic pressure detecting unit 200 is for carrying out acoustic pressure detection.In the present embodiment, described loudspeaker detection unit comprises the radio network interface of flush bonding processor, pick-up, ultrasonic sensor and a support IEE802.15.4 standard; Described flush bonding processor connects pick-up, ultrasonic sensor and radio network interface.
Loudspeaker detection unit 100 and acoustic pressure detecting unit 200 all can be divided into four kinds of operating states: battery saving mode, only have runs, and electric current is less than three microamperes; Gather acoustic pressure, start ADC and gather acoustic pressure, electric current is less than five milliamperes; Monitor controller, open wireless receiving interface, checks whether acoustic pressure detection control device has order or configuration distributing, and electric current is less than 30 milliamperes; Send data, the acoustic pressure collected sent by wave point, electric current is less than 40 milliamperes.(with reference to many integrated-circuit implementation, getting maximum).
For reaching the power consumption reducing detecting unit as far as possible, we design as follows: use acoustic pressure detection control device as the unique FFD (full-function device) in a wireless low-speed local area network network, be also telegon simultaneously.All loudspeaker detection unit and acoustic pressure detecting unit, be all RFD (reduced function device), and be connected to acoustic pressure detection control device by Star topology.That is, all detecting units mutually can not communication, can only with the communication of acoustic pressure detection control device, and the wireless low-speed local area network network of this locality by acoustic pressure detection control device as telegon unified management channel.
First, acoustic pressure detection control device adopts the super frame of IEEE802.15.4 and enable beacon, for ensureing low-power consumption and fixing time delay, our super frame does not have the CAP(contention access stage), only have CFP(to fix slot phase) and the INACTIVE(communication dormant stage) two stages.According to IEEE802.15.4, each detecting unit has globally unique 64 bit address, and this address is configured to acoustic pressure detection control device by user by SDK.According to this 64 bit address, acoustic pressure detection control device distributes a local area address for it, and notices detecting unit by the beacon portion of super frame.
In the CFP stage, acoustic pressure detection control device is that each detecting unit in local low-speed local area network network reserves a fixing time slot, and in this time slot, corresponding detecting unit starts wireless transmission, the acoustic pressure data of oneself is sent to acoustic pressure detection control device.Like this, all detecting units only at the time slot of oneself, enter wireless transmission pattern, close at once whole wireless (comprising reception) after having launched; Except in the CFP stage, all the other stage wave points are all in closed condition, ensure that power consumption is minimum.Only have and temporarily enter drainage pattern when acquisition interval arrives, can accomplish easily, the drainage pattern time is less than 10%; The duration ratio of CFP in super frame is then less than 5%, and the average current of such detecting unit can be less than 1mA, and under common 3.3V powers environment, power is less than 3.3mW.
The general power of loudspeaker unit in audio system is greater than 3W, and driving voltage peak value is greater than 4.5V.Because ensure the real-time detection of audio system, even if when not having audio frequency to play, intermittent test sine wave drive electric current is still had to pass through.And loudspeaker detection unit is not during having audio frequency or test and excitation by loud speaker, in acoustic pressure detection control device adjustment super frame, the ratio of CFP and INACTIVE, makes CFP accounting less, closes the acquisition function of detecting unit simultaneously, make it be in battery saving mode for a long time, electric current is less than three microamperes.When having audio frequency or test and excitation signal sends into loud speaker, only needing the low leakage capacitor storage of electrical energy that common, gathering electric energy from drive singal, just can meet loudspeaker detection unit job requirement completely, thus without the need to extra electric power system.
Like this, loudspeaker detection unit compact, with low cost, and without the need to power supply and the additional wires of transfer of data, can be embedded in loudspeaker detection unit when loud speaker is produced completely, user installation is completely the same with use and conventional loudspeakers, and cost difference is also not obvious.As long as after additional configuration acoustic pressure detection control device, a real-time complete audio frequency acoustic pressure detection system can be obtained fast.
Acoustic pressure detecting unit then needs to require to install according to ownership goal sound field, and the common batteries that can adopt without condition of power supply is powered; With good conditionsi, indoor can use power taking nearby, and outdoor then can adopt solar panel to power.Because acoustic pressure detecting unit only just enters operating state when system plays audio frequency, the plenty of time is in power down mode, and electric current is less than 3 microamperes, and its power consumption will be starkly lower than loudspeaker detection unit.Even if use common batteries to power, also can work really long days.
Described acoustic pressure detection control device, this unit has a flush bonding processor, the input of at least one road audio frequency and a road audio output interface, the low-speed wireless network interface of a support IEE802.15.4 standard, an Ethernet or WIFI network interface, use AC220V Alternating Current Power Supply.Acoustic pressure detection control device, as the manager of region sound field, is gathered the data of loudspeaker detection unit and acoustic pressure detecting unit, judges audio system state by low-speed wireless network interface, and automatically adjusts according to user's setting.By Ethernet interface at a high speed, these data can also be delivered to acoustic pressure detection system SDK by further, for senior monitoring or the control software design of system; Receive the control command of upper layer software (applications) simultaneously from acoustic pressure detection system SDK, change the setup parameter of Target Sound Field.
Described acoustic pressure detection control device, has loud speaker measuring ability, and it has a road audio frequency input, receives the audio frequency of local audio system, and has audio detection ability.When local audio system is in idle condition, when namely not having audio frequency to play, it produces the sine wave signal of a 28KHZ-40KHZ automatically, every fixed time interval, by audio output interface through power amplifier, outputs to loudspeaker unit.Loudspeaker detection unit detects loud speaker by ultrasonic sensor and exports acoustic pressure, and data is sent to acoustic pressure detection control device.When system carries out audio frequency broadcasting, acoustic pressure detection control device activates all loudspeaker detection unit and acoustic pressure detecting unit, detects the acoustic pressure of each point.Like this, neither affect user and normally use, we also ensure that to whole audio system complete, detect continuously and in real time; And loudspeaker detection unit and acoustic pressure detecting unit, being in resting state when there is no audio frequency all completely, also greatly having saved the energy.
The conveniently use of domestic consumer, the described loud speaker based on wireless network and sound pressure detection device also comprise: a background server being provided with acoustic pressure detection system SDK; Described background server connects acoustic pressure detection control device by second network interface.Wherein, acoustic pressure detection system SDK provides the api function storehouse based on C, C++, JAVA language, is used for reading the real time data of acoustic pressure detection control device, also can configures the parameter of acoustic pressure detection control device, to complete the adjustment to sound field.Can be arranged in ordinary personal computers or smart machine, be convenient to the audio system that third party builds oneself characteristic.
Present invention also offers a preferred embodiment, in the present embodiment:
Loudspeaker detection unit adopts the CC2530F256 of American TI semiconductor as flush bonding processor, the ultrasonic sensor of a 40Khz, an ordinary audio pick-up head.
Acoustic pressure detecting unit adopts the CC2530F256 of American TI semiconductor as flush bonding processor, an ordinary audio pick-up head.
Acoustic pressure detection control device adopts the LPC1758 of NXP semiconductor as main control processor, is connected to the wireless processor of a CC2530F256, by the external a slice LAN8720A of RMII interface as Ethernet interface by UART interface.Connect a slice PCM3000 by I2S interface and realize audio frequency input digitlization, and digital audio is simulated.Acoustic pressure detection control device is as the unique FFD in slow network PAN (personal area network), and serve as the telegon of PAN, all detecting units are connected to acoustic pressure detection control device by Star topology.Also namely, detecting unit each other can not communication, and detecting unit only carries out communication with acoustic pressure detection control device.And adopt the IEEE802.15.4 super frame having beacon, carry out communication management.
Play there being audio frequency or process loud speaker pumping signal test period, adopt the super frame length of 125ms, because our data volume is very little, each data packet length that we formulate is lower than 20 bytes, so specify that each GTS timeslice length is less than 25 byte transmission times, namely under 250KB transmission speed, duration is less than 0.8 millisecond, and also namely CFP phases-time length equals:
millisecond, remaining time is the INACTIVE stage, and because we do not have the CAP stage, the restriction of the GTS slot of IEEE802.15.4 is increased to 24 from original 7 by us.When there is no audio frequency broadcasting and loud speaker pumping signal, adopting the super frame length in 1 second, reduce further the power consumption of detecting unit.
Please continue to refer to Fig. 2, Fig. 3 and Fig. 4, acoustic pressure detection control utensil has two kinds of modes to judge that whether local audio system is idle.One is the audio frequency by PCM3000 Real-time Collection local audio input interface, when the voice data energy density detected is lower than set point, thinks that local audio system is in idle condition; Two is the supervisory instructions receiving higher level's audio system from acoustic pressure systems axiol-ogy SDK by Ethernet interface, when receiving the instruction entering idle condition, thinks that local audio system is in idle condition.
After local audio system enters idle condition, the acoustic pressure detecting unit belonging to the appointment of acoustic pressure detection control device enters collection halted state, to enter an energy savings; Loudspeaker detection unit belonging to appointment enters ultrasound examination state, from the AD port processing acoustic pressure that ultrasonic sensor is corresponding.Acoustic pressure detection control device every 1 hour (user can set) send 5 second 40KHZ sinusoidal audio, PCM3000 is sent to by oneself inner 40KHZ pure tone audio data generated, thus the sine wave signal of a 40KHZ is produced at audio output port, be delivered to loudspeaker unit through local audio system.And in first the 1 second super frame beacon sent in pumping signal, setting loudspeaker detection unit enters ultrasonic waves collecting work state, informs that the duration of next super frame changes 125ms into, until pumping signal terminates simultaneously.
When acoustic pressure detection control device detect the voice data energy density of local audio input interface be greater than set point or receive higher level's audio system enter the instruction of operating state time, local audio system enters operating state.Acoustic pressure detection control device stops the transmission of 40KHZ pure tone audio data immediately, by the audio frequency of local audio input interface access local audio output interface; Then, in the 1 second super frame beacon arrived first afterwards, setting detecting unit enters audio collection operating state, informs that the duration of next super frame changes 125ms into, until pumping signal terminates simultaneously.
CC2530 has the AD converter of 8 passage 12BIT, and we adopt 8BIT, and the sample rate of 8Khz, namely uses Interruption, starts AD converter every 125 microseconds, waits for that AD conversion completes, reads the audio pickup signal of telecommunication of 8BIT in the interruption of AD conversion.So then, the definition according to IEC61672:2003 calculates continuous acoustic pressure (time average), as shown in the formula:
,
represent IEC61672 reference acoustic pressure.
In order to obtain system response time faster, computing time, constant was the continuous fast acoustic pressure of 125ms simultaneously for we, also namely calculated the average sound pressure of 1000 sampled values; With the continuous at a slow speed acoustic pressure that time constant was 1 second, it is also the average sound pressure of 8000 sampled values.And can be set by the user, adjust according to the sensitivity curve of people's ear to sound frequency, support C weighting curve, A weighting curve and Z weighting curve (not adjusting) three kinds, acquiescence adopts Z weighting curve to compensate, be limited to the computing capability of CC2530, weight adjusting carries out in acoustic pressure detection control device.
After the startup acquisition instructions receiving acoustic pressure detection control device, all detecting units start collection and the calculating of carrying out acoustic pressure.Every the 125ms time interval, acoustic pressure detection control device sends a super frame, and in the CFP stage of super frame, each detecting unit has a corresponding timeslice.In this timeslice, loudspeaker detection unit or acoustic pressure detecting unit, by quick continuously sound pressure level and at a slow speed continuous sound pressure level report acoustic pressure detection control device by the 2.4G wireless communication interface of CC2530.In the INCATIVE stage of this super frame, all detecting units close wireless communication interface with saves energy.
The built-in 2.4G wireless transceiver of CC2530, supports IEEE802.15.4 wireless network standards, has 256KBFLASH, 8KB internal memory.We select CONTIKI embedded OS as embedded system, use above-mentioned super frame way to manage to carry out communication management.Like this, meet the least in power-consuming of detecting unit on the one hand, also ensure that the time delay of detection is less on the one hand in addition, real-time is very high.
The LPC1758 that acoustic pressure detection control device adopts operates in 80MHZ, is the risc processor of the CORTEX-M3 type of 32, has powerful disposal ability.It carries out exchanges data by the wireless communication module of UART interface and an embedded CC2530, and the data sent from loudspeaker detection unit or acoustic pressure detecting unit are received by CC2530, then send to LPC1758 by the serial ports of CC2530; The control command of LPC1758 is then sent to CC2530 by serial ports, and is sent to the loudspeaker detection unit or acoustic pressure detecting unit of specifying by CC2530.
Demarcate the phase in acoustic pressure detection system, acoustic pressure detection control device under the environmental condition that background acoustic pressure is less, plays multistage standard audio by user.Acoustic pressure detection control device inputs the correlation of data and loudspeaker detection unit and acoustic pressure detecting unit according to local audio, as shown in the formula:
By the time delay that iteration is different, the time delay that maximum correlation coefficient is corresponding is exactly the measurement time delay of corresponding loudspeaker detection unit and acoustic pressure detecting unit.After determining the measurement time delay of a unit, we can also calculate the gain of acquisition system easily.
Acoustic pressure detection control device, constantly gathers the voice data of local audio input interface by PCM3000, according to built-in standard loudspeakers model, be respectively each loudspeaker detection unit and calculate sound pressure level, and add the timestamp of oneself.。According to the time delay of demarcating and gain, when the loud speaker sound pressure level error that two timestamps are corresponding exceed or lower than preset value time, acoustic pressure detection control device sends an alert data bag to acoustic pressure detection system SDK, points out local audio system to break down.
If start automatic acoustic pressure adjustment function, acoustic pressure detection control device can gather the acoustic pressure detected value of acoustic pressure detecting unit, and asks for consecutive mean sound pressure level according to time average algorithm.The measurement time delay obtained according to timing signal and gain, acoustic pressure detection control device can predict the acoustic pressure of this acoustic pressure detecting unit.The local audio system removing prediction in consecutive mean sound pressure level exports acoustic pressure, is background acoustic pressure.
According to the background acoustic pressure calculating gained, according to the adjustable strategies of user preset, the gain of adjustment local audio system, to meet the signal to noise ratio requirement of user's setting.
Because acoustic pressure detection control utensil has Ethernet or the WIFI network interface of a high speed, the time delay that acoustic pressure detection packet is delivered to acoustic pressure detection system SDK from acoustic pressure detection control device is very little, is usually less than 5ms.Thus, if user needs the adjustment algorithm of having by oneself, also can the automatic acoustic pressure adjustment programme of designed, designed, by acoustic pressure detection system SDK from acoustic pressure detection control device background extraction acoustic pressure, after calculating rational audio system gain, send gain setting to acoustic pressure detection control device.
In sum, the present invention measures loud speaker and sound field acoustic pressure in real time owing to have employed wireless sensor technology, and by low-speed wireless network, the data collected is sent to acoustic pressure detection control device.Acoustic pressure detection control utensil has higher computing capability, its detection is also more complete more comprehensively, further, an acoustic pressure detection system SDK is that third party developer provides a unified approach obtaining data and control acoustic pressure detection system, is also convenient to different customization and completes unique acoustic pressure measuring and adjustation strategy.Along with the further genralrlization of wireless Internet of Things, cost, the volume of loudspeaker detection unit and acoustic pressure detecting unit can constantly reduce, and handling property and reliability then can improve constantly.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the present invention.
Claims (6)
1., based on loud speaker and the sound pressure detection device of wireless network, it is characterized in that, comprising:
One or more loudspeaker detection unit, one or more acoustic pressure detecting unit and acoustic pressure detection control device; Described acoustic pressure detection control device connects loudspeaker detection unit and acoustic pressure detecting unit respectively by wireless network; Described loudspeaker detection unit and acoustic pressure detecting unit obtain sound field acoustic pressure and after digitlization, distribute real-time sound pressure information to described acoustic pressure detection control device by wireless network;
Described loudspeaker detection unit is arranged on a speaker, and power end is connected on the audio driven circuit of loud speaker, for by the power taking of described audio driven circuit, and uses low leakage capacitor storage of electrical energy;
After local audio system enters idle condition, the loudspeaker detection unit belonging to the appointment of acoustic pressure detection control device enters ultrasound examination state, from the AD port processing acoustic pressure that ultrasonic sensor is corresponding.
2. according to claim 1 based on loud speaker and the sound pressure detection device of wireless network, it is characterized in that, described loudspeaker detection unit comprises the radio network interface of flush bonding processor, pick-up, ultrasonic sensor and a support IEE802.15.4 standard; Described flush bonding processor connects pick-up, ultrasonic sensor and radio network interface.
3. according to claim 1 based on loud speaker and the sound pressure detection device of wireless network, it is characterized in that, described acoustic pressure detecting unit comprises the radio network interface of flush bonding processor, pick-up and support IEE802.15.4 standard; Described flush bonding processor connects pick-up and radio network interface.
4. according to claim 1 based on loud speaker and the sound pressure detection device of wireless network, it is characterized in that, described acoustic pressure detection control device comprises: flush bonding processor, at least one road audio input interface and a road audio output interface, the radio network interface supporting IEE802.15.4 standard and second network interface; Described flush bonding processor connects audio input interface, audio output interface, radio network interface and second network interface respectively.
5. according to claim 4 based on loud speaker and the sound pressure detection device of wireless network, it is characterized in that, described second network interface is WIFI network interface or Ethernet interface.
6. according to claim 4 based on loud speaker and the sound pressure detection device of wireless network, it is characterized in that, also comprise: a background server being provided with acoustic pressure detection system SDK; Described background server connects acoustic pressure detection control device by second network interface.
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| CN110996243B (en) * | 2019-12-16 | 2021-05-04 | 广州市迪士普音响科技有限公司 | Loudspeaker on-line detection system |
| CN111629316A (en) * | 2020-05-15 | 2020-09-04 | 广东思派康电子科技有限公司 | Monitoring method and monitoring system for continuous playing test of sound box |
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| CN201781548U (en) * | 2010-05-26 | 2011-03-30 | 康佳集团股份有限公司 | Set-top box with intelligent volume adjustability |
| CN201926500U (en) * | 2010-11-16 | 2011-08-10 | 福建植桐电子科技有限公司 | Ultra low power consumption digital sound level meter based on WIFI (Wireless Fidelity) |
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