CN104320738A - Digital microphone circuit - Google Patents
Digital microphone circuit Download PDFInfo
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- CN104320738A CN104320738A CN201410515206.8A CN201410515206A CN104320738A CN 104320738 A CN104320738 A CN 104320738A CN 201410515206 A CN201410515206 A CN 201410515206A CN 104320738 A CN104320738 A CN 104320738A
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Abstract
The invention discloses a digital microphone circuit. The digital microphone circuit comprises a first digital microphone, a second digital microphone, an audio encoding and decoding device and a pull-down resistor, wherein the first digital microphone is provided with a first data end, the second digital microphone is provided with a second data end, the audio encoding and decoding device is provided with a data input end, and the first data end, the second data end and the pull-down resistor are connected with the data input end in parallel. The digital microphone circuit can solve the problem in the prior art that a conventional digital microphone circuit comprises multiple digital microphones yet cannot effectively detect a damaged digital microphone.
Description
Technical field
The present invention relates to digital circuit technique field, in particular to a kind of digital microphone circuit.
Background technology
Along with the development of radio-frequency technique and antenna technology, the frequency band that mobile phone terminal requires gets more and more, and the layout of antenna for mobile phone is also more tending towards variation.Wherein, in a lot of mobile phone project, in order to ensure the performance of antenna, also just inevitably aerial position is placed near Mike (MIC), like this, antenna will cause interference to MIC body and MIC circuit.Such as, when GSM900 frequency range time, TDD Noise can be produced, be commonly called as current sound.
Keeping away this problem to return, gradually adopting digital MIC now, the antijamming capability that digital MIC is concrete very strong, thus decrease the interference of some high-frequency signals to MIC.For the design of many MIC, the connection of current digital MIC has 2 kinds of modes: a kind of mode is: MIC_1 and MIC_2 shares one group of clock and bus, is connected on coder (CODEC) end.Another kind of mode is the respective clock of MIC_1 and MIC_2 and data wire, is connected on respectively on 2 interfaces of CODEC end.Because first kind of way can save PDM (product data management) interface, be the main flow connection of industry at present, some platforms supplier Reference Design all adopts this connection.
But when adopting the digital MIC of the first connection, time as Double-number MIC and in a bus, once there be a MIC to break down, the signal delivering to 2 MIC of CODEC end will be consistent.Following problem can be brought like this: first, under factory mode, the functional detection of MIC cannot be carried out.As: there are MIC existing problems when attachment, cannot normally work, but under factory mode, the MIC that during test, this breaks down have sound, because such connection directly can cause the MIC broken down directly can copy the signal of normal MIC.Cause the signal of 2 MIC the same, two MIC denoising algorithm will inevitably be caused to lose efficacy, and the signal of main MIC is consistent with the signal of auxiliary MIC, and real sound is disappeared.
Therefore, providing the digital MIC circuit of the many MIC of detection that can be correct, is this area technical problem urgently to be resolved hurrily.
Summary of the invention
The invention provides a kind of digital microphone circuit, comprise to solve digital microphone circuit in prior art the problem that multiple digital microphone effectively can not detect damage digital microphone.
A kind of digital microphone circuit, it comprises the first digital microphone, the second digital microphone, audio codec and pull down resistor, described first digital microphone has the first data terminal, described second digital microphone has the second data terminal, described audio codec has data input pin, the described data input pin of described first data terminal, the second data terminal and described pull down resistor parallel connection access.
Wherein, described first digital microphone comprises the first clock end, and described second digital microphone comprises second clock end, and described audio codec comprises output terminal of clock, and described first clock end and second clock end access described output terminal of clock by mode in parallel.
Wherein, described first digital microphone comprises the first voltage end, and described second digital microphone comprises the second voltage end, and described first voltage end and the second voltage end access potential circuit by mode in parallel.
Wherein, described first digital microphone comprises first choosing end, and described second digital microphone comprises second choosing end, and described first selects end to be connected to described potential circuit, described second choosing end ground connection.
Wherein, described first digital microphone comprises the first earth terminal, and described second digital microphone comprises the second earth terminal, described first earth terminal and the equal ground connection of described second earth terminal.
Wherein, the Standard resistance range of described pull down resistor is 3000 ohm to 4000 ohm.
Wherein, the resistance of described pull down resistor is 3300 ohm.
The digital microphone circuit that the technical program provides, by by accessing to audio codec in parallel for multiple digital microphone, and accesses a pull down resistor at the data input pin of audio codec.When detecting, effectively can detect whether one of them digital microphone damages.Solve in prior art, when one of them digital microphone damages the problem that can not be detected.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the digital microphone circuit that embodiment of the present invention provides;
Fig. 2 is the circuit diagram of the digital microphone circuit not being provided with pull down resistor;
Fig. 3 is the data spectrogram that the digital microphone circuit of Fig. 2 exports when wherein the first digital microphone damages;
Fig. 4 is the data spectrogram that the digital microphone circuit of Fig. 1 exports when wherein the first digital microphone damages.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined object and take and effect, below in conjunction with accompanying drawing and preferred embodiment, the present invention is described in detail as after.
Refer to Fig. 1, the execution mode of the technical program provides a kind of digital microphone circuit 100, described digital microphone circuit comprises the first digital microphone 110, second digital microphone 120, audio codec 130 and pull down resistor 140, and the mode of described first digital microphone 110 and the second digital microphone 120 parallel connection is connected to audio codec 130.
First digital microphone (MIC_1) 110 comprises the first voltage end 111 (VDD_1), the first clock end 112 (CLK_1), the first data terminal (DATA_1) 113, first choosing end (L/R_1) 114 and the first earth terminal (GND_1) 115.
Described second digital microphone (MIC_2) 120 comprises the second voltage end 121 (VDD_2), 123, second, second clock end (CLK_2) 122, second data terminal (DATA_2) choosing end (L/R_2) 124 and the second earth terminal (GND_2) 125.
Described audio codec (CODEC) 130 comprises output terminal of clock (CLK-OUTPUT) 131 and data input pin (DATA-INPUT) 132.
The mode of described first voltage end 111 and the second voltage end 112 parallel connection is connected to potential circuit.Described first clock end 112 and second clock end 122 adopt mode in parallel to be connected to described output terminal of clock 131, thus make the first digital microphone 110 and the second digital microphone 120 adopt identical clock.Described first data terminal (DATA_1) 113 and the second data terminal 123 adopt mode in parallel to be connected to data input pin 132, make the data-signal of the data-signal of the first data terminal 113 and the second data terminal 123 can be sent to audio codec 130.Described first earth terminal 115 and the second earth terminal 125 all ground connection.Described first selects end 114 to be connected with potential circuit.Described second is selected end 124 ground connection.
One end of described pull down resistor 140 is connected to described data input pin 132, other end ground connection.The resistance of described pull down resistor 140 can be 3000 ohm to 4000 ohm, is preferably 3100 ohm to 3500 ohm.In present embodiment, the resistance of described pull down resistor 140 is 3300 ohm.
Refer to Fig. 2, if when not being connected with pull down resistor 140 in digital microphone circuit, when the first digital microphone 110 damages cisco unity malfunction, collection of illustrative plates when testing as shown in Figure 3.Refer to Fig. 3, when the rising edge of clock comes time, first selects end 114 to connect high level, data are delivered to data input pin 132 by the first digital microphone 110, when clock falling edge come time, second is selected termination low level, the second digital microphone 120 by data portion to DATA portion line.When the first digital microphone 110 damages, the data wire of output only changes when clock lower rises edge.That is: when trailing edge time, because the first digital microphone 110 damages, without defeated according to output, and now the second digital microphone 120 is high-impedance state, such first digital microphone 110 directly continue to use before the second digital microphone 120 data, detecting the first digital microphone 110 obtained is the same with the data of the second digital microphone 120, causes also being have no idea differentiation first digital microphone 110 and the second digital microphone 120 on software.
Refer to Fig. 1, the digital microphone circuit 100 that the technical program provides, it is connected with pull down resistor 140.When the first digital microphone 110 damages cisco unity malfunction, collection of illustrative plates when testing as shown in Figure 4.Refer to Fig. 4, no matter the data of data input pin 132 are at the rising edge of clock and trailing edge, all can change, and find from waveform, when rising edge comes time, always be low level, can infer that the first digital microphone 110 does not necessarily have signal to export, exist abnormal.By accessing drop-down pull down resistor 140 at data input pin 132, when the first digital microphone 110 breaks down time, it can not export significant level, when trailing edge come by clock time, the data that second data terminal 122 that can not copy the second digital microphone 120 again exports, and directly under the effect of pull down resistor 140, low level is delivered to data input pin 132.So just effectively achieve differentiation and the detection of the first digital microphone 110 and the second digital microphone 120, factory mode also just can test out the digital microphone broken down.No matter DATA data are at the rising edge of CLK and trailing edge, all can change, and find from waveform, when rising edge comes time, always be low level, can infer that MIC_2 does not necessarily have signal to export, there is exception.
When under the first digital microphone 110 and the normal situation of the second digital microphone 120, pull down resistor 140 can produce certain impact to high level, can be 3000 ohm to 4000 ohm by arranging the resistance of described pull down resistor 140, described pull down resistor 140 can not affect the first digital microphone 110 and the second digital microphone 120 has an impact.
Be understandable that, the quantity of the digital microphone that described digital microphone circuit 100 comprises is not limited to two, also can be multiple, as more than three or three.Multiple described Mike adopts mode in parallel to be connected to audio codec 130.
The digital microphone circuit that the technical program provides, by by accessing to audio codec in parallel for multiple digital microphone, and accesses a pull down resistor at the data input pin of audio codec.When detecting, effectively can detect whether one of them digital microphone damages.Solve in prior art, when one of them digital microphone damages the problem that can not be detected.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (7)
1. a digital microphone circuit, it comprises the first digital microphone, the second digital microphone, audio codec and pull down resistor, described first digital microphone has the first data terminal, described second digital microphone has the second data terminal, described audio codec has data input pin, the described data input pin of described first data terminal, the second data terminal and described pull down resistor parallel connection access.
2. digital microphone circuit as claimed in claim 1, it is characterized in that, described first digital microphone comprises the first clock end, described second digital microphone comprises second clock end, described audio codec comprises output terminal of clock, and described first clock end and second clock end access described output terminal of clock by mode in parallel.
3. digital microphone circuit as claimed in claim 1, it is characterized in that, described first digital microphone comprises the first voltage end, and described second digital microphone comprises the second voltage end, and described first voltage end and the second voltage end access potential circuit by mode in parallel.
4. digital microphone circuit as claimed in claim 3, is characterized in that, described first digital microphone comprises first choosing end, and described second digital microphone comprises second choosing end, and described first selects end to be connected to described potential circuit, described second choosing end ground connection.
5. digital microphone circuit as claimed in claim 1, it is characterized in that, described first digital microphone comprises the first earth terminal, and described second digital microphone comprises the second earth terminal, described first earth terminal and the equal ground connection of described second earth terminal.
6. digital microphone circuit as claimed in claim 1, it is characterized in that, the Standard resistance range of described pull down resistor is 3000 ohm to 4000 ohm.
7. digital microphone circuit as claimed in claim 1, it is characterized in that, the resistance of described pull down resistor is 3300 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410515206.8A CN104320738A (en) | 2014-09-29 | 2014-09-29 | Digital microphone circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410515206.8A CN104320738A (en) | 2014-09-29 | 2014-09-29 | Digital microphone circuit |
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| CN104320738A true CN104320738A (en) | 2015-01-28 |
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| CN201410515206.8A Pending CN104320738A (en) | 2014-09-29 | 2014-09-29 | Digital microphone circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107251576A (en) * | 2015-02-19 | 2017-10-13 | 美商楼氏电子有限公司 | Interface for microphone to mi crophone communication |
| CN109068256A (en) * | 2018-10-09 | 2018-12-21 | 晶晨半导体(上海)股份有限公司 | Detection method, system, microphone and the intelligent sound box of microphone |
| CN109068238A (en) * | 2018-10-09 | 2018-12-21 | 晶晨半导体(上海)股份有限公司 | microphone and intelligent sound box |
| CN109327767A (en) * | 2018-10-09 | 2019-02-12 | 晶晨半导体(上海)股份有限公司 | A kind of microphone circuit, rosin joint recognition methods and microphone apparatus |
| CN109348391A (en) * | 2018-10-09 | 2019-02-15 | 晶晨半导体(上海)股份有限公司 | Detection method, system and the microphone of microphone |
| CN109600704A (en) * | 2018-11-20 | 2019-04-09 | 晶晨半导体(上海)股份有限公司 | A method of the microphone rosin joint inspection based on digit pulse |
| CN112822621A (en) * | 2019-11-18 | 2021-05-18 | 瑞昱半导体股份有限公司 | Test circuit and test method of dual-channel microphone and audio codec |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107251576A (en) * | 2015-02-19 | 2017-10-13 | 美商楼氏电子有限公司 | Interface for microphone to mi crophone communication |
| CN109068256A (en) * | 2018-10-09 | 2018-12-21 | 晶晨半导体(上海)股份有限公司 | Detection method, system, microphone and the intelligent sound box of microphone |
| CN109068238A (en) * | 2018-10-09 | 2018-12-21 | 晶晨半导体(上海)股份有限公司 | microphone and intelligent sound box |
| CN109327767A (en) * | 2018-10-09 | 2019-02-12 | 晶晨半导体(上海)股份有限公司 | A kind of microphone circuit, rosin joint recognition methods and microphone apparatus |
| CN109348391A (en) * | 2018-10-09 | 2019-02-15 | 晶晨半导体(上海)股份有限公司 | Detection method, system and the microphone of microphone |
| CN109600704A (en) * | 2018-11-20 | 2019-04-09 | 晶晨半导体(上海)股份有限公司 | A method of the microphone rosin joint inspection based on digit pulse |
| CN112822621A (en) * | 2019-11-18 | 2021-05-18 | 瑞昱半导体股份有限公司 | Test circuit and test method of dual-channel microphone and audio codec |
| CN112822621B (en) * | 2019-11-18 | 2023-02-28 | 瑞昱半导体股份有限公司 | Test circuit and test method of dual-channel microphone and audio codec |
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