CN108419191A - A kind of pick up facility based on time-sharing multiplex interface - Google Patents
A kind of pick up facility based on time-sharing multiplex interface Download PDFInfo
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- CN108419191A CN108419191A CN201710071796.3A CN201710071796A CN108419191A CN 108419191 A CN108419191 A CN 108419191A CN 201710071796 A CN201710071796 A CN 201710071796A CN 108419191 A CN108419191 A CN 108419191A
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- 238000005538 encapsulation Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 abstract description 7
- 238000007726 management method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013501 data transformation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/04—Microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
- H04R2400/11—Aspects regarding the frame of loudspeaker transducers
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The present invention provides a kind of sound pick-ups based on time-sharing multiplex interface, including several pick-up circuits and signal processing unit, including：Each pick-up circuit includes microphone and the first time-sharing multiplex interface, the signal processing unit is provided with one second time-sharing multiplex interface, the second time-sharing multiplex interface has been directly connected to a time-sharing multiplex bus, and each pick-up circuit is connected to by corresponding first time-sharing multiplex interface in corresponding time-sharing multiplex bus respectively.Just it is not necessary that codec is arranged, so that it may which, to realize the communication of multigroup pick-up circuit and signal processing unit, the pin for reducing signal processing unit occupies, while reducing circuit cost, also substantially increases the efficiency of data processing.
Description
Technical field
The present invention relates to sound pick-up technical fields, are specifically related to a kind of pick up facility based on time-sharing multiplex interface.
Background technology
Digital sound pick-up output is digital signal, rather than common analog signal.The grown form of product has rectangular
, also have circular, shape is similar with common electret microphone.Basic structure is：One energy converter, for generating representative
The analog signal (usually being completed by electret vibrating membrane and its back electrode) of acoustical signal；With the single-bit ∑ more than 1-Δ modulation
Device A-D converter generates data output according to oversampling rate and in the form of ∑-Δ modulation bit stream from analog signal
Signal.The great advantage of digital sound pick-up is strong antijamming capability, without high-frequency filter capacitor built in as traditional microphones,
Filter circuit.Digital sound pick-up, will not be by those from computer, network, radio frequency border magnetic field signal because of its intrinsic feature
The interference in source influences, therefore when access, without shielding line, can effectively utilize the limited sky of Related product
Between.With popularizing for digital sound pick-up, traditional MEMS sound pick-ups include sound pick-up, codec and signal processing unit group
At to save the occupied number of pin of signal processing unit, so being one group by two sound pick-ups by codec passes through volume
Decoder encodes its output signal, after decoding process in input terminal dsp chip, and 8 MEMS sound pick-ups are arranged if necessary,
It is communicated as shown in Figure 1, forming topological structure as shown in Figure 1, but this kind of communication modes are to the treatment effeciency of data
It is not high, and increased codec improves circuit cost, delay is larger.
Invention content
For the above-mentioned problems in the prior art, now it is intended to provide a kind of pickup based on time-sharing multiplex interface and sets
It is standby, with.
Specific technical solution is as follows：
A kind of pick up facility based on time-sharing multiplex interface, including several MEMS sound pick-ups and signal processing unit, packet
It includes：Each MEMS sound pick-ups include that energy converter and the first time-sharing multiplex interface, the signal processing unit are provided with
One second time-sharing multiplex interface, the second time-sharing multiplex interface have been directly connected to a time-sharing multiplex bus, each MEMS
Sound pick-up is connected to by corresponding first time-sharing multiplex interface in corresponding time-sharing multiplex bus respectively.
Further, the MEMS sound pick-ups include bias supply, and the bias supply is for providing the MEMS pickups
The bias voltage of the work of the energy converter of device.
Further, the MEMS sound pick-ups include
Amplifier, the amplifier are coupled to the signal output end of the energy converter, for amplifying the energy converter output
Signal.
Further, the MEMS sound pick-ups further include input and output analog module, and the input and output analog module is matched
It is equipped with time-sharing multiplex agreement, and is connected to the first time-sharing multiplex interface, is communicated for realizing time-sharing multiplex.
Further, the MEMS sound pick-ups include
Sound equalizer, the input terminal of the sound equalizer couple the output end of the amplifier.
Further, the MEMS sound pick-ups include
Modulator, the input terminal of the modulator are coupled to the output end of the sound equalizer.
Further, the MEMS sound pick-ups include
Decimation filter, the input terminal of the decimation filter are coupled to the output end of the modulator；The extraction filter
The output end of wave device is coupled to the input and output analog module.
Further, the MEMS sound pick-ups include that there are two power supplys by an encapsulation chip package, the encapsulation chip
Pin, the power pins provide operating voltage for coupling external power supply for the MEMS sound pick-ups.
Further, the MEMS sound pick-ups further include power management module, the input terminal coupling of the power management module
It is connected to the power pins.
The good effect of above-mentioned technical proposal is：
The above-mentioned MEMS sound pick-ups based on time-sharing multiplex interface, so, just it is not necessary that codec is arranged, so that it may with
The communication for realizing multigroup MEMS sound pick-ups and dsp chip, the pin for reducing dsp chip occupies, while reducing circuit cost, also greatly
The big efficiency for improving data processing.
Description of the drawings
Fig. 1 is traditional MEMS sound pick-up schematic diagrams of the present invention；
Fig. 2 is the MEMS sound pick-up schematic diagrams of the present invention；
Fig. 3 is sound pick-up internal circuit circuit diagram of the present invention.
In attached drawing：110, MEMS sound pick-ups；111, energy converter；112, bias supply；113, power management module；114, it puts
Big device；115, sound equalizer；116, modulator；117, decimation filter；118, input and output analog module；120, encoding and decoding
Device；130, signal processing unit；101, the first time-sharing multiplex interface；102, the second time-sharing multiplex interface；103, time-sharing multiplex is total
Line.
Specific implementation mode
It is real below in order to make the technical means, the creative features, the aims and the efficiencies achieved by the present invention be easy to understand
It applies example combination attached drawing 1 to be specifically addressed technical solution provided by the invention to attached drawing 3, but the following contents is not as the present invention's
It limits.
A kind of pick up facility based on time-sharing multiplex interface provided in this embodiment, including several MEMS sound pick-ups 110 with
And signal processing unit 130 (being configurable to DSP data processing chips), including：Every MEMS sound pick-ups 110 include transducing
Device 111 and the first time-sharing multiplex interface 101, signal processing unit 130 are provided with one second time-sharing multiplex interface 102, and second
Time-sharing multiplex interface 102 has been directly connected to a time-sharing multiplex bus 103, and every MEMS sound pick-ups 110 pass through corresponding respectively
One time-sharing multiplex interface 101 is connected in corresponding time-sharing multiplex bus 103.Time-sharing multiplex is exactly time division multiplexing.Time-division
Multiplexing refers to a kind of intersection digit pulse by different channels or time slot, while multiple numbers are transmitted on the same communication medium
The technology of word data, voice and video signal etc..For DS0, channel width is the channel width used substantially in telecommunications
64kbps.The rate of each time slot is PCM (Pulse-Code-Modulation) the speech channels 64Kbps of a standard.Often lead to
The repetition rate of road time slot is Ts=8KHz, i.e. the frame period is 125us.So codec 120 can be not provided with just
The many-one communication of sound pick-up may be implemented.Microelectric technique and mechanical engineering are fused together by MEMS MEMS
A kind of industrial technology, its opereating specification is in micron range.It is more smaller than it, it is referred to as in the similar technology of nanometer range
Nano electromechanical systems.
MEMS sound pick-ups 110 include bias supply 112, and bias supply 112 is used to provide the biasing of the work of energy converter 111
Voltage.
MEMS sound pick-ups 110 include amplifier 114, and amplifier 114 is coupled to the signal output end of energy converter 111, is used for
Amplify the signal that energy converter 111 exports.Amplifier 114 is used to amplify the signal of the output of energy converter 111.
MEMS sound pick-ups 110 further include input and output analog module 118, and input and output analog module 118 is configured with timesharing
Multiplex protocol, and it is connected to the first time-sharing multiplex interface 101, it communicates for realizing time-sharing multiplex, is received by LCK pins
Frequency controls the working condition of MEMS sound pick-ups 110, if the frequency that signal processing unit 130 exports is less than 900kHz,
Into working condition, enter dormant state if the frequency that signal processing unit 130 exports is more than 1MHz.
MEMS sound pick-ups 110 include
Sound equalizer 115, the output end of the input terminal coupling amplifier 114 of sound equalizer 115.Balanced device refers to using
Decayed (i.e. transmission loss) because of caused by frequency difference and the different network of phase difference with correcting.It can correcting attenuation and frequency pass
System, referred to as " attenuation equalizer "；Can phase calibration difference and frequency relation be known as " phase equalizer ".In cable television system
In often need to use balanced device.Balanced device is usually serially connected in the circuit of amplifier 114, is caused by being transmitted for balanced cable
High frequency, the decaying of low frequency end signal is inconsistent and is arranged.Because the attenuation characteristic of cable increases with the raising of frequency.Commonly decline
Subtract balanced device, also known as amplitude equalizer.Generally it is made of elements such as coil, capacitor, resistance.The characteristic of attenuation equalizer hinders
Anti- to be equal to a definite value, the decibel of equilibrium value attenuation between cable high and low frequency reference point is poor, the frequency characteristic of balanced device
Just with cable frequencies characteristic on the contrary, but the low decaying of frequency is big, frequency is highly attenuating small, and equilibrium is played with this opposite characteristic
Effect.Cable has decaying to signal and attenuation degree is directly proportional to the square root for the signal frequency transmitted, i.e. the high damaged on end of cable
It is big to consume lower end loss.Using a balanced device, signal is made more to decay low frequency part and the high frequency section that less decays, then
One amplifier 114 with flat characteristic is set in the output end of balanced device, you can signal level is restored to original water
It is flat.
MEMS sound pick-ups 110 include modulator 116, and the input terminal of modulator 116 is coupled to the output of sound equalizer 115
End.Low-frequency digital signal (such as audio, video, data) is modulated in high-frequency digital signal, one kind of signal transmission is carried out
Equipment.Modulator 116 is widely used in the transmission of the information such as broadcast (audio signal), TV (vision signal).Modulator 116 1
As and demodulator use in pairs, modulator 116 in Digital Signal Processing to high-frequency signal for will be transmitted, and demodulator is then
Digital signal is reduced into original signal.
MEMS sound pick-ups 110 include decimation filter 117, and the input terminal of decimation filter 117 is coupled to modulator 116
Output end；The output end of decimation filter 117 is coupled to input and output analog module 118.A/D is moved on to intermediate frequency very from base band
To radio frequency, the analog signal received is digitized as early as possible.It is often difficult since the processing speed of DSP data processing chips is limited
Various types of other real-time processing is directly carried out with the high speed digital signals sampled to A/D.In order to solve this contradiction, need
Digital down-conversion technology is used, the two-forty signal that sampling obtains is become into low rate baseband signal, to carry out in next step
Signal processing.By secondary frequency modulation(PFM), so that it may with meet time-sharing multiplex communications protocol need frequency realize communication.
MEMS sound pick-ups 110 are by an encapsulation chip package, and encapsulation chip includes there are two power pins, and power pins are used
In coupling external power supply, operating voltage is provided for MEMS sound pick-ups 110.As shown in figure 3, one shares 7 pins, 5 conducts
Alternatively and reset function, 1 is done data-transformation facility to pin other two of which used in one time-sharing multiplex interface 101, and 1
A offer clock signal.
MEMS sound pick-ups 110 further include power management module 113, and the input terminal of power management module 113 is coupled to power supply
Pin.Power management module 113 be amplifier 114, modulator 116, decimation filter 117, sound equalizer 115, input it is defeated
Go out the power supply of analog module 118.
It these are only preferred embodiments of the present invention, be not intended to limit the implementation manners and the protection scope of the present invention, it is right
For those skilled in the art, it should can appreciate that and all be replaced with being equal made by description of the invention and diagramatic content
It changes and obviously changes obtained scheme, should all be included within the scope of the present invention.
Claims (9)
1. a kind of pick up facility based on time-sharing multiplex interface, including several MEMS sound pick-ups and signal processing unit, special
Sign is, including：Each MEMS sound pick-ups include energy converter and the first time-sharing multiplex interface, the signal processing list
Member is provided with one second time-sharing multiplex interface, and the second time-sharing multiplex interface has been directly connected to a time-sharing multiplex bus, each
The MEMS sound pick-ups are connected to by corresponding first time-sharing multiplex interface in corresponding time-sharing multiplex bus respectively.
2. a kind of pick up facility based on time-sharing multiplex interface according to claim 1, which is characterized in that the MEMS is picked up
Sound device includes bias supply, and the bias supply is used to provide the bias voltage of the work of the energy converter of the MEMS sound pick-ups.
3. a kind of pick up facility based on time-sharing multiplex interface according to claim 2, which is characterized in that the MEMS is picked up
Sound device includes
Amplifier, the amplifier are coupled to the signal output end of the energy converter, the letter for amplifying the energy converter output
Number.
4. a kind of pick up facility based on time-sharing multiplex interface according to claim 3, which is characterized in that the MEMS is picked up
Sound device further includes input and output analog module, and the input and output analog module is configured with time-sharing multiplex agreement, and is connected to institute
The first time-sharing multiplex interface is stated, is communicated for realizing time-sharing multiplex.
5. a kind of pick up facility based on time-sharing multiplex interface according to claim 4, which is characterized in that the MEMS is picked up
Sound device includes
Sound equalizer, the input terminal of the sound equalizer couple the output end of the amplifier.
6. a kind of pick up facility based on time-sharing multiplex interface according to claim 5, which is characterized in that the MEMS is picked up
Sound device includes
Modulator, the input terminal of the modulator are coupled to the output end of the sound equalizer.
7. a kind of pick up facility based on time-sharing multiplex interface according to claim 6, which is characterized in that the MEMS is picked up
Sound device includes
Decimation filter, the input terminal of the decimation filter are coupled to the output end of the modulator；The decimation filter
Output end be coupled to the input and output analog module.
8. a kind of pick up facility based on time-sharing multiplex interface according to claim 1, which is characterized in that the MEMS is picked up
Sound device is by an encapsulation chip package, and the encapsulation chip includes there are two power pins, and the power pins are outer for coupling
Portion's power supply provides operating voltage for the MEMS sound pick-ups.
9. a kind of pick up facility based on time-sharing multiplex interface according to claim 8, which is characterized in that the MEMS is picked up
Sound device further includes power management module, and the input terminal of the power management module is coupled to the power pins.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710071796.3A CN108419191A (en) | 2017-02-09 | 2017-02-09 | A kind of pick up facility based on time-sharing multiplex interface |
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| CN201710071796.3A CN108419191A (en) | 2017-02-09 | 2017-02-09 | A kind of pick up facility based on time-sharing multiplex interface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110113701A (en) * | 2019-03-26 | 2019-08-09 | 晶晨半导体(上海)股份有限公司 | A kind of hardware adjustment method for simulating microphone |
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| CN206602662U (en) * | 2017-02-09 | 2017-10-31 | 钰太芯微电子科技（上海）有限公司 | A kind of pick up facility based on time-sharing multiplex interface |
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2017
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|---|---|---|---|---|
| CN101867825A (en) * | 2010-06-25 | 2010-10-20 | 中国传媒大学 | Device for circularly monitoring multi-channel video and method thereof |
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| CN105430583A (en) * | 2014-09-15 | 2016-03-23 | 英飞凌科技股份有限公司 | System and Method for a Transducer |
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| CN110113701A (en) * | 2019-03-26 | 2019-08-09 | 晶晨半导体(上海)股份有限公司 | A kind of hardware adjustment method for simulating microphone |
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