CN203368745U - Ultralow noise digital microphone with high-amplitude audio frequency capturing performance - Google Patents
Ultralow noise digital microphone with high-amplitude audio frequency capturing performance Download PDFInfo
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- CN203368745U CN203368745U CN 201320357904 CN201320357904U CN203368745U CN 203368745 U CN203368745 U CN 203368745U CN 201320357904 CN201320357904 CN 201320357904 CN 201320357904 U CN201320357904 U CN 201320357904U CN 203368745 U CN203368745 U CN 203368745U
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Abstract
The utility model relates to the technical field of signal processing, and especially relates to a microphone. An ultralow noise digital microphone with high-amplitude audio frequency capturing performance comprises a first transducer and a second transducer which are used for sensing audio signals. A signal output end of the first transducer is connected with a first signal attenuation module. A signal output end of the second energy transducer is connected with a second signal attenuation module. An output signal of the first transducer is sent to a first output end and a second output end after passing through the first signal attenuation module. An output signal of the second transducer is sent to a third output end and a fourth output end after passing through the second signal attenuation module. The first output end and the third output end output normal signals, and the second output end and the fourth output end output attenuation signals after amplitude attenuation. The first output end, the third output end, the second output end and the fourth output end are connected with an analog-digital converter. The digital microphone has the high-amplitude audio frequency capturing performance and is capable of effectively restraining noises; and the usage performance of a micro electromechanical system microphone is improved.
Description
Technical field
The utility model relates to the signal processing technology field, relates in particular to a kind of microphone.
Background technology
Development and progress along with technology, electronic equipment for consumption has increasing function and application, and wherein audio performance is a very crucial key element weighing the overall performance of electronic equipment for consumption, as audio input device, the quality of microphone property directly affects the audio capturing performance, and on the impact of user's experience own profound.Existing electret microphone, producing little effect aspect further raising sensitivity, signal to noise ratio and the linearity, makes the improvement of audio performance be restricted.
Based on MEMS (Micro Electromechanical System, be MEMS (micro electro mechanical system)) microphone broken through a lot of limitation of traditional electret microphone, there is microminiaturization, intellectuality, multi-functional, high integration and be suitable for the characteristics of producing in enormous quantities, thereby more and more explored and apply.
The MEMS condenser microphone of existing structure as shown in Figure 1, the inside of one housing 1 is packaged with a single transducer for the sensing audio signal 2 and an ASIC(Application Specific Integrated Circuit, the specialty integrated circuit) chip 3, between transducer 2 and asic chip 3, signal is connected, transducer 2 is converted to the signal of telecommunication by acoustic pressure, asic chip 3 is for the treatment of the signal of telecommunication and send the coherent signal processing apparatus to and processed, realize audio capturing, the shortcoming that the structure of the single transducer of this employing exists is that the audio capturing performance is not ideal enough, can not effectively realize noise is suppressed, affected the improvement of audio performance.
The utility model content
The purpose of this utility model is, a kind of digital microphone of super low noise high amplitude audio capturing is provided, and solves above technical problem.
The technical problem that the utility model solves can realize by the following technical solutions:
The digital microphone of super low noise high amplitude audio capturing, it is characterized in that, comprise the first transducer for the sensing audio signal, the second transducer, the signal output part of described the first transducer connects a first signal attenuation module, the signal output part of described the second transducer connects a secondary signal attenuation module, the output signal of described the first transducer has the first output after described first signal attenuation module, the second output, the output signal of described the second transducer has the 3rd output after described secondary signal attenuation module, the 4th output,
Described the second output and described the 4th output of the deamplification after decaying with described the 3rd output and for output amplitude for described the first output of exporting normal signal are connected to an analog to digital converter jointly.
Preferably, described first signal attenuation module and described secondary signal attenuation module comprise respectively a signal attenuator, and described signal attenuator adopts a bleeder circuit for the deamplification that obtains amplitude fading.
Preferably, described bleeder circuit adopts a capacitance partial pressure circuit, and described capacitance partial pressure circuit comprises that the first electric capacity reaches and the second electric capacity of described the first capacitances in series, between described the first electric capacity and described the second electric capacity, is provided with the deamplification output.
Preferably, described the first output, described the 3rd output, and described the second output, described the 4th output connect respectively an amplifier, described amplifier is positioned at the front end of described analog to digital converter.
Preferably, also comprise a dedicated IC chip, described dedicated IC chip comprises at least one in described signal attenuator, amplifier, analog to digital converter.
Preferably, also comprise an external shell, the inside of described external shell is provided with described the first transducer, the second transducer and described dedicated IC chip, and described the first transducer, described the second transducer and described dedicated IC chip signal connect.
Preferably, also comprise a substrate, described substrate is provided with described the first transducer, the second transducer and described dedicated IC chip.
Preferably, described amplifier adopts preamplifier.
Preferably, described analog to digital converter comprises the first sigma delta (sigma-delta) modulating unit, the second sigma delta (sigma-delta) modulating unit; The normal signal of described the first output and described the 3rd output output enters described the first sigma delta modulating unit; The deamplification of described the second output and described the 4th output output enters described the second sigma delta modulating unit.
Preferably, described digital microphone is the digital microphone based on MEMS (micro electro mechanical system).
Beneficial effect: owing to adopting above technical scheme, the utlity model has high amplitude audio capturing performance, can effectively suppress noise, improve the serviceability of MEMS condenser microphone.
The accompanying drawing explanation
The basic structure schematic diagram of the MEMS condenser microphone that Fig. 1 is prior art;
Fig. 2 is circuit diagram of the present utility model;
Fig. 3 is structural representation of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as restriction of the present utility model.
With reference to Fig. 2, Fig. 3, the digital microphone of super low noise high amplitude audio capturing, comprise the first transducer 21, the second transducer 22 for the sensing audio signal, the signal output part of the first transducer 21 connects a first signal attenuation module 31, the signal output part of the second transducer 22 connects a secondary signal attenuation module 32, the output signal of the first transducer 21 has the first output, the second output after first signal attenuation module 31, and the output signal of the second transducer 22 has the 3rd output, the 4th output after secondary signal attenuation module 32; The first output and the 3rd output are for exporting normal signal, and the second output and the 4th output are used for the deamplification after the output amplitude decay; The first output and the 3rd output, and the second output and the 4th output be connected to an analog to digital converter 51, analog to digital converter 51 comprises the first sigma delta (sigma-delta) modulating unit 521, the second sigma delta (sigma-delta) modulating unit 522; The normal signal of the first output and the output of the 3rd output enters the first sigma delta modulating unit 521; The deamplification of the second output and the output of the 4th output enters the second sigma delta modulating unit 522, after normal signal and deamplification input analog-to-digital converter, carry out shaping or modulation by the first sigma delta modulating unit 521 and 522 pairs of noises of the second sigma delta modulating unit, make the noise in signal bandwidth greatly reduce, quantizing noise in the filtered signal bandwidth, reduce noise jamming effectively.
Further, first signal attenuation module and secondary signal attenuation module comprise respectively a signal attenuator, and signal attenuator adopts a bleeder circuit, and bleeder circuit obtains the deamplification after amplitude fading by dividing potential drop.Make the first above-mentioned output and the 3rd output there is high amplitude with respect to the second output and the 4th output.Make the utility model be suitable for processing the audio signal of high sound pressure level, effectively catch for the audio signal realization of high sound pressure level.
Above-mentioned bleeder circuit can adopt a capacitance partial pressure circuit, and the capacitance partial pressure circuit can comprise that the first electric capacity reaches and the second electric capacity of the first capacitances in series, and deamplification is drawn from the series connection point between the first electric capacity and the second electric capacity.Also can adopt other forms of bleeder circuit to replace the capacitance partial pressure circuit.
Further, the first output, the 3rd output, and the second output, the 4th output after an amplifier 41,42,43,44 amplifies, enter analog to digital converter 51 respectively. Amplifier 41,42,43,44 adopts preamplifier, and preamplifier has higher voltage gain, small-signal can be amplified on fiduciary level.
Also comprise a dedicated IC chip 5, at least one functional unit in signal attenuator, amplifier 41, analog to digital converter 51 is integrated in dedicated IC chip 5.
Also comprise a substrate 61, substrate 61 is provided with the first transducer 21, the second transducer 22 and dedicated IC chip 5.Substrate 61 adopts the PCB substrate with FR4 material rate.
Also comprise an external shell 11, the inside of external shell 11 is provided with the first transducer 21, the second transducer 22 and dedicated IC chip 5.External shell 11 adopts metal external shell.Realize the interference of shielding external signal.
Further, the first transducer 21, the second transducer 22 wherein comprises elastic film (Membrane).Described digital microphone is the digital microphone based on MEMS (micro electro mechanical system).
The foregoing is only the utility model preferred embodiment; not thereby limit execution mode of the present utility model and protection range; to those skilled in the art; should recognize that being equal to that all utilization the utility model specifications and diagramatic content done replace and the resulting scheme of apparent variation, all should be included in protection range of the present utility model.
Claims (10)
1. the digital microphone of super low noise high amplitude audio capturing, it is characterized in that, comprise the first transducer for the sensing audio signal, the second transducer, the signal output part of described the first transducer connects a first signal attenuation module, the signal output part of described the second transducer connects a secondary signal attenuation module, the output signal of described the first transducer has the first output after described first signal attenuation module, the second output, the output signal of described the second transducer has the 3rd output after described secondary signal attenuation module, the 4th output,
Described the second output and described the 4th output of the deamplification after decaying with described the 3rd output and for output amplitude for described the first output of exporting normal signal are connected to an analog to digital converter jointly.
2. the digital microphone of super low noise high amplitude audio capturing according to claim 1, it is characterized in that, described first signal attenuation module and described secondary signal attenuation module comprise respectively a signal attenuator, and described signal attenuator adopts a bleeder circuit for the deamplification that obtains amplitude fading.
3. the digital microphone of super low noise high amplitude audio capturing according to claim 2, it is characterized in that, described bleeder circuit adopts a capacitance partial pressure circuit, described capacitance partial pressure circuit comprises that the first electric capacity reaches and the second electric capacity of described the first capacitances in series, between described the first electric capacity and described the second electric capacity, is provided with the deamplification output.
4. the digital microphone of super low noise high amplitude audio capturing according to claim 3, it is characterized in that, described the first output, described the 3rd output, and described the second output, described the 4th output connect respectively an amplifier, described amplifier is positioned at the front end of described analog to digital converter.
5. the digital microphone of super low noise high amplitude audio capturing according to claim 4, it is characterized in that, also comprise a dedicated IC chip, described dedicated IC chip comprises at least one in described signal attenuator, amplifier, analog to digital converter.
6. the digital microphone of super low noise high amplitude audio capturing according to claim 5, it is characterized in that, also comprise an external shell, the inside of described external shell is provided with described the first transducer, the second transducer and described dedicated IC chip, and described the first transducer, described the second transducer and described dedicated IC chip signal connect.
7. the digital microphone of super low noise high amplitude audio capturing according to claim 6, is characterized in that, also comprises a substrate, and described substrate is provided with described the first transducer, the second transducer and described dedicated IC chip.
8. the digital microphone of super low noise high amplitude audio capturing according to claim 4, is characterized in that, described amplifier adopts preamplifier.
9. the digital microphone of super low noise high amplitude audio capturing according to claim 1, is characterized in that, described analog to digital converter comprises the first sigma delta modulating unit, the second sigma delta modulating unit; The normal signal of described the first output and described the 3rd output output enters described the first sigma delta modulating unit; The deamplification of described the second output and described the 4th output output enters described the second sigma delta modulating unit.
10. according to the digital microphone of the described super low noise high amplitude of claim 1 to 9 any one audio capturing, it is characterized in that, described digital microphone is the digital microphone based on MEMS (micro electro mechanical system).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320357904 CN203368745U (en) | 2013-06-20 | 2013-06-20 | Ultralow noise digital microphone with high-amplitude audio frequency capturing performance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320357904 CN203368745U (en) | 2013-06-20 | 2013-06-20 | Ultralow noise digital microphone with high-amplitude audio frequency capturing performance |
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| CN203368745U true CN203368745U (en) | 2013-12-25 |
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| CN 201320357904 Expired - Lifetime CN203368745U (en) | 2013-06-20 | 2013-06-20 | Ultralow noise digital microphone with high-amplitude audio frequency capturing performance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104244153A (en) * | 2013-06-20 | 2014-12-24 | 上海耐普微电子有限公司 | Ultralow-noise high-amplitude audio capture digital microphone |
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2013
- 2013-06-20 CN CN 201320357904 patent/CN203368745U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104244153A (en) * | 2013-06-20 | 2014-12-24 | 上海耐普微电子有限公司 | Ultralow-noise high-amplitude audio capture digital microphone |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201204, 601C, Lane 198, Zhang Heng Road, Zhangjiang hi tech park, Shanghai, Pudong New Area, 10 Patentee after: YUTAIXIN MICROELECTRONICS TECHNOLOGY (SHANGHAI) Co.,Ltd. Patentee after: ZILLTEK TECHNOLOGY Corp. Address before: 201204, 601C, Lane 198, Zhang Heng Road, Zhangjiang hi tech park, Shanghai, Pudong New Area, 10 Patentee before: SHANGHAI SNIPER MICROELECTRONICS Patentee before: ZILLTEK TECHNOLOGY CORP. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131225 |