CN206602662U - 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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- CN206602662U CN206602662U CN201720120411.3U CN201720120411U CN206602662U CN 206602662 U CN206602662 U CN 206602662U CN 201720120411 U CN201720120411 U CN 201720120411U CN 206602662 U CN206602662 U CN 206602662U
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Abstract
The utility model provides a kind of sound pick-up based on time-sharing multiplex interface, including some 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 in corresponding time-sharing multiplex bus by corresponding first time-sharing multiplex interface respectively.Codec need not be just set, it is possible to realize the communication of multigroup pick-up circuit and signal processing unit, the pin for reducing signal processing unit takes, while reducing circuit cost, also substantially increases the efficiency of data processing.
Description
Technical field
The utility model is related to sound pick-up technical field, is specifically related to a kind of pickup based on time-sharing multiplex interface and sets
It is standby.
Background technology
The output of digital sound pick-up is data signal, rather than common analog signal.The grown form of product has square
, also there is circle, shape is similar with common electret microphone.Basic structure is：One transducer, for producing representative
The analog signal (generally 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, data output is produced according to oversampling speed 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 as traditional microphones built-in high-frequency filter capacitor,
Filter circuit.Digital sound pick-up because its it is intrinsic the characteristics of, will not by those come from computer, network, radio frequency border magnetic field signal
Interference, the influence in source, therefore when access, without using shielding line, the limited sky of Related product can be effectively utilized
Between.With the popularization of digital sound pick-up, traditional MEMS sound pick-ups include sound pick-up, codec and signal processing unit group
Into to save the occupied number of pin of signal processing unit, so two sound pick-ups are passed through into volume for one group by codec
Decoder encodes to its output signal, after decoding process in input dsp chip, and sets 8 MEMS sound pick-ups if desired,
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, is delayed larger.
Utility model content
For the above-mentioned problems in the prior art, now aim to provide a kind of pickup based on time-sharing multiplex interface and set
It is standby, with.
Concrete technical scheme is as follows：
A kind of pick up facility based on time-sharing multiplex interface, including some MEMS sound pick-ups and signal processing unit, bag
Include：Each MEMS sound pick-ups include transducer and the first time-sharing multiplex interface, and 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, each MEMS
Sound pick-up is connected in corresponding time-sharing multiplex bus by corresponding first time-sharing multiplex interface respectively.
Further, the MEMS sound pick-ups include bias supply, and the bias supply is used to provide the MEMS pickups
The bias voltage of the work of the transducer of device.
Further, the MEMS sound pick-ups include
Amplifier, the amplifier is coupled to the signal output part of the transducer, for amplifying the transducer output
Signal.
Further, the MEMS sound pick-ups also include input and output analog module, and the input and output analog module is matched somebody with somebody
Time-sharing multiplex agreement is equipped with, and is connected to the first time-sharing multiplex interface, for realizing that time-sharing multiplex is communicated.
Further, the MEMS sound pick-ups include
Sound equalizer, the input of the sound equalizer couples the output end of the amplifier.
Further, the MEMS sound pick-ups include
Modulator, the input of the modulator is coupled to the output end of the sound equalizer.
Further, the MEMS sound pick-ups include
Decimation filter, the input of the decimation filter is coupled to the output end of the modulator；It is described to extract filter
The output end of ripple device is coupled to the input and output analog module.
Further, the MEMS sound pick-ups are by an encapsulation chip package, and the encapsulation chip includes two power supplys
Pin, the power pins are used to couple external power source, and operating voltage is provided for the MEMS sound pick-ups.
Further, the MEMS sound pick-ups also include power management module, the input 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, need not just set codec, it is possible to
The communication of multigroup MEMS sound pick-ups and dsp chip is realized, the pin for reducing dsp chip takes, while reducing circuit cost, also greatly
The big efficiency for improving data processing.
Brief description of the drawings
Fig. 1 is traditional MEMS sound pick-up schematic diagrams of the present utility model；
Fig. 2 is MEMS sound pick-ups schematic diagram of the present utility model；
Fig. 3 is the utility model sound pick-up internal circuit circuit theory diagrams.
In accompanying drawing：110th, MEMS sound pick-ups；111st, transducer；112nd, bias supply；113rd, power management module；114th, put
Big device；115th, sound equalizer；116th, modulator；117th, decimation filter；118th, input and output analog module；120th, encoding and decoding
Device；130th, signal processing unit；101st, the first time-sharing multiplex interface；102nd, the second time-sharing multiplex interface；103rd, time-sharing multiplex is total
Line.
Embodiment
In order that technological means, creation characteristic, reached purpose and effect that the utility model is realized are easy to understand, with
The technical scheme that lower embodiment combination accompanying drawing 1 is provided the utility model to accompanying drawing 3 is specifically addressed, but herein below not as
It is of the present utility model to limit.
The present embodiment provide a kind of pick up facility based on time-sharing multiplex interface, including some 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
The time-sharing multiplex interface 101 of device 111 and first, signal processing unit 130 is provided with one second time-sharing multiplex interface 102, 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 transmitting multiple numbers on same communication medium
The technology of word data, voice and video signal etc..The channel width used substantially in telecommunications is DS0, and its channel is a width of
64kbps.The speed 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 be Ts=8KHz, i.e. frame period be 125us.So codec 120 can be just not provided with just
The many-one communication of sound pick-up can be realized.Microelectric technique is fused together by MEMS MEMSs with mechanical engineering
A kind of industrial technology, its opereating specification is in micrometer range.It is 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 for the biasing for providing the work of transducer 111
Voltage.
MEMS sound pick-ups 110 include amplifier 114, and amplifier 114 is coupled to the signal output part of transducer 111, is used for
Amplify the signal that transducer 111 is exported.Amplifier 114 is used for the signal for amplifying the output of transducer 111.
MEMS sound pick-ups 110 also include input and output analog module 118, and input and output analog module 118 is configured with timesharing
Multiplex protocol, and the first time-sharing multiplex interface 101 is connected to, for realizing that time-sharing multiplex is communicated, received by LCK pins
Frequency controls the working condition of MEMS sound pick-ups 110, if the frequency that signal processing unit 130 is exported is less than 900kHz,
Into working condition, enter resting state if the frequency that signal processing unit 130 is exported is more than 1MHz.
MEMS sound pick-ups 110 include
Sound equalizer 115, the input of sound equalizer 115 couples the output end of amplifier 114.Balanced device refers to use
To correct decay (i.e. transmission loss) and the different network of phase difference because caused by frequency is different.Can correcting attenuation and frequency pass
System, it is referred to as " attenuation equalizer "；Energy phase calibration difference is referred to as " phase equalizer " with frequency relation.In cable television system
Back warp often needs to use balanced device.Balanced device is generally serially connected in the circuit of amplifier 114, is caused for balanced cable transmission
High frequency, low frequency end signal attenuation is inconsistent and sets.Because the attenuation characteristic of cable increases with the rise of frequency.Conventional declines
Subtract balanced device, also known as amplitude equalizer.Typically it is made up of elements such as coil, capacitor, resistance.The characteristic resistance of attenuation equalizer
Anti- to be equal to a definite value, its equilibrium value is poor for the decibel of attenuation between cable high and low frequency reference point, the frequency characteristic of balanced device
Just with cable frequencies characteristic on the contrary, but the low decay of frequency is big, frequency is highly attenuating small, and equilibrium is played with this opposite characteristic
Effect.Cable has decay 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
Consume lower end loss big.Using a balanced device, signal is set more to decay low frequency part and HFS of less decaying, then
One amplifier 114 with flat characteristic is set in the output end of balanced device, you can signal level is returned to original water
It is flat.
MEMS sound pick-ups 110 include modulator 116, and the input 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 is used to be transmitted in Digital Signal Processing to high-frequency signal, and demodulator is then
Data signal is reduced into original signal.
MEMS sound pick-ups 110 include decimation filter 117, and the input 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 because the processing speed of DSP data processing chips is limited
To be sampled to A/D, obtained high speed digital signals directly carry out various types of other real-time processing.In order to solve this contradiction, need
Digital down-conversion technology is used, the two-forty signal that sampling is obtained becomes low rate baseband signal, to carry out next step
Signal transacting.By secondary frequency modulation(PFM), it is possible to which frequency realizes communication the need for meeting time-sharing multiplex communications protocol.
MEMS sound pick-ups 110 include two power pins by an encapsulation chip package, encapsulation chip, and power pins are used
It is that MEMS sound pick-ups 110 provide operating voltage in coupling external power source.As shown in figure 3, one has 7 pins, 5 are used as
Alternatively and reset function, 1 is done data-transformation facility, 1 to pin other two of which used in one time-sharing multiplex interface 101
Individual offer clock signal.
MEMS sound pick-ups 110 also include power management module 113, and the input 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 analog module 118 to power.
The utility model preferred embodiment is these are only, embodiment of the present utility model and protection is not thereby limited
Scope, to those skilled in the art, should can appreciate that all utilization the utility model specifications and diagramatic content institute
Scheme obtained by the equivalent substitution made and obvious change, should be included in protection domain of the present utility model
It is interior.
Claims (9)
1. a kind of pick up facility based on time-sharing multiplex interface, including some MEMS sound pick-ups and signal processing unit, it is special
Levy and be, including：Each MEMS sound pick-ups include transducer and the first time-sharing multiplex interface, the signal transacting 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 in corresponding time-sharing multiplex bus by corresponding first time-sharing multiplex interface respectively.
2. a kind of pick up facility based on time-sharing multiplex interface according to claim 1, it is characterised in that the MEMS is picked up
Sound device includes bias supply, and the bias supply is used for the bias voltage for providing the work of the transducer of the MEMS sound pick-ups.
3. a kind of pick up facility based on time-sharing multiplex interface according to claim 2, it is characterised in that the MEMS is picked up
Sound device includes
Amplifier, the amplifier is coupled to the signal output part of the transducer, the letter for amplifying the transducer output
Number.
4. a kind of pick up facility based on time-sharing multiplex interface according to claim 3, it is characterised in that the MEMS is picked up
Sound device also 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, for realizing that time-sharing multiplex is communicated.
5. a kind of pick up facility based on time-sharing multiplex interface according to claim 4, it is characterised in that the MEMS is picked up
Sound device includes
Sound equalizer, the input of the sound equalizer couples the output end of the amplifier.
6. a kind of pick up facility based on time-sharing multiplex interface according to claim 5, it is characterised in that the MEMS is picked up
Sound device includes
Modulator, the input of the modulator is 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, it is characterised in that the MEMS is picked up
Sound device includes
Decimation filter, the input of the decimation filter is 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, it is characterised in that the MEMS is picked up
Sound device is by an encapsulation chip package, and the encapsulation chip includes two power pins, and the power pins are outer for coupling
Portion's power supply, operating voltage is provided for the MEMS sound pick-ups.
9. a kind of pick up facility based on time-sharing multiplex interface according to claim 8, it is characterised in that the MEMS is picked up
Sound device also includes power management module, and the input of the power management module is coupled to the power pins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720120411.3U CN206602662U (en) | 2017-02-09 | 2017-02-09 | A kind of pick up facility based on time-sharing multiplex interface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720120411.3U CN206602662U (en) | 2017-02-09 | 2017-02-09 | A kind of pick up facility based on time-sharing multiplex interface |
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| Publication Number | Publication Date |
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| CN206602662U true CN206602662U (en) | 2017-10-31 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108419191A (en) * | 2017-02-09 | 2018-08-17 | 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 |
| CN109859684A (en) * | 2017-11-30 | 2019-06-07 | 乐金显示有限公司 | Display device and its interface method |
| CN110825667A (en) * | 2019-11-12 | 2020-02-21 | 天津飞腾信息技术有限公司 | Design method and structure of low-speed IO device controller |
-
2017
- 2017-02-09 CN CN201720120411.3U patent/CN206602662U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108419191A (en) * | 2017-02-09 | 2018-08-17 | 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 |
| CN109859684A (en) * | 2017-11-30 | 2019-06-07 | 乐金显示有限公司 | Display device and its interface method |
| CN110825667A (en) * | 2019-11-12 | 2020-02-21 | 天津飞腾信息技术有限公司 | Design method and structure of low-speed IO device controller |
| CN110825667B (en) * | 2019-11-12 | 2022-03-11 | 飞腾信息技术有限公司 | Design method and structure of low-speed IO device controller |
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