CN113301490A - Method for detecting PDM silicon microphone array - Google Patents
Method for detecting PDM silicon microphone array Download PDFInfo
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- CN113301490A CN113301490A CN202110578696.6A CN202110578696A CN113301490A CN 113301490 A CN113301490 A CN 113301490A CN 202110578696 A CN202110578696 A CN 202110578696A CN 113301490 A CN113301490 A CN 113301490A
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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
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/004—Monitoring arrangements; Testing arrangements for microphones
- H04R29/005—Microphone arrays
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Abstract
The invention relates to the technical field of microphones and discloses a method for detecting a PDM silicon microphone array, which is used for detecting whether a PDM digital silicon microphone is abnormally mounted or not so as to ensure the normal work of the microphone array. The invention comprises the following steps: firstly, playing a section of sweep frequency audio signal with fixed frequency towards a PDM silicon microphone array, recording the sound by the silicon microphone array in the process of playing the sweep frequency audio signal, and outputting PDM format audio; then, disassembling PDM format audio on each group of data lines to form multi-channel audio data corresponding to the microphones one by one, wherein the multi-channel audio data at least comprises audio amplitudes of left and right sound channels; and finally, judging whether the silicon microphone array is abnormally installed or not according to the audio amplitude of the left and right sound channels in each channel. The method is suitable for installation detection of the PDM format digital silicon microphone array.
Description
Technical Field
The invention relates to the technical field of microphones, in particular to a method for detecting a PDM silicon microphone array.
Background
Due to the fact that the voice interaction market is hot in recent years, microphone array applications are increasing. Microphone Array (Microphone Array) refers to a Microphone system in which 2 or more (usually, an integer multiple of 2) microphones are arranged in a certain rule. The microphone array can overcome the defects that a single microphone is short in recording distance and weak in noise and reverberation suppression capacity.
The arrays currently in the mainstream are classified into Analog Microphone (AMIC) and Digital Microphone (DMIC). The PDM (Pulse Density Modulation) format digital silicon microphone (DSIMIC) is very suitable for being applied as a microphone array due to the characteristics of excellent low noise and anti-interference capability, simple interface logic and low cost.
Because the microphone array adopts a plurality of microphones for recording simultaneously, when part of the microphones are absent, the microphones can still record, but the sound receiving effect is sharply reduced, the sound receiving distance and the beam forming are reduced, and the angle judgment accuracy is reduced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method is used for detecting whether the PDM digital silicon microphone is abnormally mounted or not so as to ensure that the microphone array normally works.
In order to solve the problems, the invention adopts the technical scheme that: a method for detecting a PDM silicon microphone array comprises the steps that every two microphones in the PDM silicon microphone array to be detected are in one group, each group of microphones share one group of data lines, and left and right sound channels are distinguished by configuring different levels;
the specific detection steps are as follows:
s1, playing a section of sweep frequency audio signal with fixed frequency towards the PDM silicon microphone array, recording the sound by the silicon microphone array in the process of playing the sweep frequency audio signal, and outputting PDM format audio;
s2, disassembling PDM format audio on each group of data lines to form multi-channel audio data corresponding to the microphones one by one, wherein the multi-channel audio data at least comprises audio amplitudes of left and right channels;
and S3, judging whether the silicon microphone array is abnormally mounted according to the audio amplitude of the left channel and the right channel in each channel.
Further, step S3 may specifically include:
if the audio amplitudes of the left and right channels in a certain channel are not completely consistent, judging that the two microphones corresponding to the channel work normally; and if the audio amplitudes of the left channel and the right channel in a certain channel are completely consistent, judging that one of the two microphones corresponding to the channel is abnormally installed.
Further, if the audio data of the left channel and the right channel in a certain channel is empty, it is determined that both the microphones corresponding to the channel are abnormally installed.
Specifically, the mounting abnormality refers to that the microphone is out of position, neglected-mounted or insufficient-welded.
Further, step S2 may split the audio according to the clock rising and falling edge changes.
The invention has the following beneficial effects: the invention provides a detection method of a PDM silicon microphone array based on the signal flow characteristics of the current PDM format digital silicon microphone array, which can accurately detect the problem of microphone missing position, namely neglected mounting or insufficient welding, on the same data line in the production stage, and helps to improve the product yield, and the implementation mode is simple without increasing extra cost. The method is not available in the industry, has advanced and original technology and is very practical.
Drawings
FIG. 1 is a flow chart of an embodiment of detecting a PDM silicon microphone array.
Detailed Description
The invention provides a method for detecting a PDM silicon microphone array based on the signal flow characteristics of the current PDM format digital silicon microphone array.
The PDM format silicon microphone array adopts an LR dual-channel connection mode, and every two microphones share one group of data lines and clock lines. Left and right sound channels are distinguished by configuring LR pin level difference, when the level is set to be high level, the microphone is left sound channel data, the clock is high and effective, when the level is set to be low level, the microphone is right sound channel data, and the clock is low and effective. The receiving end splits and forms two data streams according to the rising and falling edge changes of the clock.
In terms of signal flow, when a certain PDM microphone on the same data line is in cold joint or neglected mounting, the high and low levels of the clock are alternately changed, and the data line is not changed, and the state of the previous microphone is still maintained. The invention can thus be implemented:
firstly, a single-frequency sine wave audio signal with fixed length and fixed frequency is played through a loudspeaker system. The distances of the loudspeaker and the 4 microphones of the microphone array cannot be exactly the same. The microphone array records the audio, the receiving end splits the microphone data on the same data line according to the change of the upper edge and the lower edge of the clock, and the PDM microphone signal flow above shows that whether the audio lacks or not, the left channel and the right channel still have data. At the moment, the audio is processed, judgment is added, the audio data of the two microphones on each data line are compared with each other, and the sensitivity of the microphones is discrete, namely, the sensitivity fluctuates within a certain reasonable interval, such as +/-1 db and +/-2 db, depending on the factory screening threshold of the microphones. If two PDM digital silicon microphones on the same data line are well welded, the left and right sound channel data are single-frequency signals to be played under the on-site condition, and the signal amplitudes are different. If two PDM digital silicon microphones on the same data line have the defect of insufficient soldering and neglected mounting, the data output does not change because of the rising edge or the falling edge of the clock, and the state of the previous microphone is still maintained, so that the data of one microphone always exists on the same data line, and the waveform and the amplitude of the data of the left and right sound channels are completely consistent. If the data lines are detected to be completely consistent, the problem of insufficient soldering or neglected loading on the current data lines can be judged.
An example is given below to further illustrate the solution of the invention.
The embodiment provides a method for detecting a PDM silicon microphone array, wherein every two microphones in the PDM silicon microphone array to be detected are in one group, each group of microphones share one group of data lines, and left and right sound channels are distinguished by configuring different levels, as shown in figure 1, and the specific detection steps of the embodiment are as follows:
1. broadcasting by the main control equipment: the main control equipment plays a single-frequency sine wave audio signal with fixed frequency towards the PDM silicon microphone array through the loudspeaker.
2. Silicon microphone array recording: the silicon microphone array records sound in the process of playing the frequency sweeping audio signal, outputs PDM format audio to the main control equipment, and the main control equipment disassembles the audio on each group of data lines to form multi-channel audio data corresponding to the microphones one to one.
3. If the audio frequencies of the two microphones on the same data line corresponding to a certain channel are null signals, namely no data exists, the two microphones are not in place, neglected to mount or in cold joint. If the two microphones of the left and right channels of the same data line have data, it indicates that at least one microphone is working normally, and the step 4 is entered for further judgment.
4. And further judgment: and comparing the audio amplitudes of the left channel and the right channel in the channel. If the audio amplitudes of the two sound channels are not completely consistent, the difference exists, and the two microphones work normally. If the audio amplitudes of the two sound channels are completely consistent, no difference exists, which indicates that the data of the two sound channels are from the same microphone, and one microphone is not in place, so that the problems of missing installation or cold joint exist.
5. And performing targeted maintenance according to the detection result.
Claims (5)
1. A method for detecting a PDM silicon microphone array is characterized in that every two microphones in the PDM silicon microphone array to be detected are in one group, each group of microphones share one group of data lines, and left and right sound channels are distinguished by configuring different levels;
the specific detection steps are as follows:
s1, playing a section of sweep frequency audio signal with fixed frequency towards the PDM silicon microphone array, recording the sound by the silicon microphone array in the process of playing the sweep frequency audio signal, and outputting PDM format audio;
s2, disassembling PDM format audio on each group of data lines to form multi-channel audio data corresponding to the microphones one by one, wherein the multi-channel audio data at least comprises audio amplitudes of left and right channels;
and S3, judging whether the silicon microphone array is abnormally mounted according to the audio amplitude of the left channel and the right channel in each channel.
2. The method for detecting the PDM silicon microphone array as claimed in claim 1, wherein the step S3 comprises:
if the audio amplitudes of the left and right channels in a certain channel are not completely consistent, judging that the two microphones corresponding to the channel work normally; and if the audio amplitudes of the left channel and the right channel in a certain channel are completely consistent, judging that one of the two microphones corresponding to the channel is abnormally installed.
3. The method as claimed in claim 1, wherein if the audio data of the left and right channels of a channel is empty, it is determined that both microphones corresponding to the channel are abnormally installed.
4. A method of testing a PDM silicon microphone array as claimed in claim 1, 2 or 3 wherein said mounting anomalies means microphone out of place, missing mount or cold joint.
5. The method of detecting the PDM silicon microphone array as claimed in claim 1 or 2, wherein the step S2 splits the audio according to the rising and falling edge of the clock.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024109392A1 (en) * | 2022-11-24 | 2024-05-30 | 歌尔科技有限公司 | Failure detection method and apparatus for digital microphone, and device and medium |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792415A (en) * | 2016-12-26 | 2017-05-31 | 歌尔科技有限公司 | A kind of method of testing and device for digital microphone array |
| 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 |
| CN109429166A (en) * | 2017-08-30 | 2019-03-05 | 哈曼国际工业有限公司 | The measurement and calibration of the speaker system of networking |
| 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 |
| CN110995914A (en) * | 2019-12-02 | 2020-04-10 | 上海创功通讯技术有限公司 | Double-microphone testing method and device |
| US20200137492A1 (en) * | 2017-09-08 | 2020-04-30 | Panasonic Intellectual Property Management Co., Ltd. | Sound pickup device, sound pickup system, sound pickup method, program, and calibration method |
| US20200196141A1 (en) * | 2017-12-14 | 2020-06-18 | Lutron Electronics Co., Inc. | Privacy Mode for a Wireless Audio Device |
-
2021
- 2021-05-26 CN CN202110578696.6A patent/CN113301490A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792415A (en) * | 2016-12-26 | 2017-05-31 | 歌尔科技有限公司 | A kind of method of testing and device for digital microphone array |
| CN109429166A (en) * | 2017-08-30 | 2019-03-05 | 哈曼国际工业有限公司 | The measurement and calibration of the speaker system of networking |
| US20200137492A1 (en) * | 2017-09-08 | 2020-04-30 | Panasonic Intellectual Property Management Co., Ltd. | Sound pickup device, sound pickup system, sound pickup method, program, and calibration method |
| US20200196141A1 (en) * | 2017-12-14 | 2020-06-18 | Lutron Electronics Co., Inc. | Privacy Mode for a Wireless Audio Device |
| 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 |
| 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 |
| CN110995914A (en) * | 2019-12-02 | 2020-04-10 | 上海创功通讯技术有限公司 | Double-microphone testing method and device |
Non-Patent Citations (2)
| Title |
|---|
| HÉCTOR A. SÁNCHEZ-HEVIA: "FPGA-based real-time acoustic camera using pdm mems microphones with a custom demodulation filter", 《2014 IEEE 8TH SENSOR ARRAY AND MULTICHANNEL SIGNAL PROCESSING WORKSHOP (SAM)》 * |
| 杨莹慧: "多麦克风语音处理DSP测试平台前端接口板系统的设计与实现", 《中国优秀博硕士学位论文全文数据库(硕士)信息科技辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024109392A1 (en) * | 2022-11-24 | 2024-05-30 | 歌尔科技有限公司 | Failure detection method and apparatus for digital microphone, and device and medium |
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