CN111314825A - System and method for automatically adjusting frequency response curve of loudspeaker - Google Patents
System and method for automatically adjusting frequency response curve of loudspeaker Download PDFInfo
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- CN111314825A CN111314825A CN201811508228.6A CN201811508228A CN111314825A CN 111314825 A CN111314825 A CN 111314825A CN 201811508228 A CN201811508228 A CN 201811508228A CN 111314825 A CN111314825 A CN 111314825A
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- frequency response
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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
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
Abstract
The invention relates to a system and a method for automatically adjusting a frequency response curve of a loudspeaker, wherein the system consists of a pickup module, an automatic adjusting module and a sound effect adjusting module, and is combined with the loudspeaker to form a closed loop structure. The system and the method for automatically adjusting the frequency response curve of the loudspeaker can automatically judge whether the adjustment is in place, have high adjustment speed, high efficiency, accurate precision and low cost, do not need manual participation, realize the automatic adjustment of the frequency response curve of the loudspeaker and have good adaptability.
Description
Technical Field
The invention relates to the field of electronics, in particular to the field of digital power amplification, and specifically relates to a system and a method for automatically adjusting a frequency response curve of a loudspeaker.
Background
The digital power amplifier system generally comprises a sound source input module, a sound effect adjusting module and a loudspeaker. The adjustment of the loudspeaker plays a decisive role in the sound effect finally presented by the digital power amplifier system, and different loudspeakers have different frequency responses, so that the sound effect parameters adjusted for a certain loudspeaker are not universal, and the loudspeaker in the system must be adjusted if the sound effect finally output by the digital power amplifier system is required to be satisfied. The final output of the loudspeaker can only be made to meet the desired effect by adjusting the frequency response curve of the loudspeaker in the system to a straight line.
In the prior art, the regulation of the loudspeaker is generally carried out in a manual regulation mode, which wastes time and labor, and because of manual operation, deviation often occurs in the regulation process, so that the regulation of the frequency response curve of the loudspeaker often cannot achieve an ideal effect.
Disclosure of Invention
The present invention is directed to overcoming at least one of the above-mentioned disadvantages of the prior art and providing a system and method for automatically adjusting a frequency response curve of a speaker, which is convenient to operate, fast in adjustment speed and good in performance.
In order to achieve the above object, the system and method for automatically adjusting the frequency response curve of a speaker of the present invention are as follows:
the system for automatically adjusting the frequency response curve of the loudspeaker is mainly characterized by comprising the following components:
the pickup module is used for receiving the sound emitted by the loudspeaker and converting the sound into corresponding frequency response data;
the automatic adjusting module is used for performing calibration calculation on the frequency response data output by the pickup module to acquire an adjusting amplitude value of the frequency response data;
the sound effect adjusting module is used for adjusting the audio input signal;
the sound effect adjusting module is connected with the automatic adjusting module and the loudspeaker at the same time;
the audio input signal comprises a plurality of standard signal sources distributed over the entire range.
Preferably, the sound pickup module includes a microphone for receiving sound emitted from the speaker and an audio analyzer for converting the sound received by the microphone into the frequency response data.
Preferably, the sound effect adjusting module comprises:
the sound source input unit is used for transmitting the audio input signal to the sound effect adjusting unit;
and the sound effect adjusting unit is simultaneously connected with the automatic adjusting module and the loudspeaker.
The method for automatically adjusting the frequency response curve of the loudspeaker based on the system is mainly characterized by comprising the following steps:
the automatic adjusting module calculates a corresponding adjusting amplitude value according to the frequency response data output by the pickup module, the sound effect adjusting module adjusts the audio input signal according to the adjusting amplitude value, transmits the adjusted audio input signal to the loudspeaker, and plays the sound corresponding to the adjusted audio input signal through the loudspeaker.
Preferably, the automatic adjusting module calculates a corresponding adjusting amplitude value according to the frequency response data output by the pickup module, the sound effect adjusting module adjusts the audio input signal according to the adjusting amplitude value, transmits the adjusted audio input signal to the speaker, and the speaker plays the sound corresponding to the adjusted audio input signal, including the following steps:
(1) the pickup module receives the sound played by the loudspeaker and converts the sound played by the loudspeaker into corresponding frequency response data;
(2) the automatic adjusting module judges whether the frequency response data is matched with a frequency response data threshold value preset by a system;
(3) if the frequency response data are not matched with the frequency response data threshold value preset by the system, continuing the subsequent step (4), otherwise, completing the adjustment of the frequency response curve of the loudspeaker;
(4) the automatic adjusting module calculates an adjusting amplitude value corresponding to the frequency response data;
(5) the sound effect adjusting module adjusts the audio input signal according to the adjusting amplitude value and transmits the adjusted audio input signal to the loudspeaker;
(6) and (3) playing corresponding sound by the loudspeaker, and continuing the step (1).
More preferably, the step (2) comprises the following steps:
(2.1) the automatic adjusting module calculates gains corresponding to the plurality of standard signal sources respectively under the current frequency response data;
(2.2) calculating the average value of gains corresponding to a plurality of standard signal sources, and acquiring the average gain of the audio input signal under the current frequency response data;
(2.3) respectively calculating the difference value between the gain corresponding to each standard signal source and the average gain to obtain the deviation value of the gain corresponding to each standard signal source;
(2.4) selecting the maximum value of all the deviation values, comparing the maximum value with a preset deviation threshold value in the automatic adjusting module, if the maximum value of the deviation values is smaller than the deviation threshold value, determining that the frequency response data is matched with the preset frequency response data threshold value of the system, otherwise, determining that the frequency response data is not matched with the preset frequency response data threshold value of the system.
Further, the automatic adjustment module calculates an adjustment amplitude value corresponding to the frequency response data as:
the automatic adjusting module takes the deviation value of the gain corresponding to each standard signal source as the adjusting amplitude value.
Further, the following steps are included between the step (4) and the step (5):
(4.1) the automatic adjusting module inputs the deviation value of the gain corresponding to each standard signal source to the sound effect adjusting module.
Furthermore, the sound effect adjusting module adjusts the audio input signal according to the adjusting amplitude value as follows:
and the sound effect adjusting module adjusts the plurality of standard signal sources one by one according to the adjusting amplitude value.
Preferably, the step (1) further comprises the following steps:
(0.1) the sound effect adjusting module transmits an audio input signal to the speaker;
(0.2) the speaker playing a sound corresponding to the audio input signal.
By adopting the system and the method for automatically adjusting the frequency response curve of the loudspeaker, the automatic adjustment of the frequency response curve of the loudspeaker is realized through the closed-loop design of the pickup module, the automatic adjustment module and the sound effect adjustment module. The system and the method for automatically adjusting the frequency response curve of the loudspeaker can automatically judge whether the adjustment is in place. The system and the method for automatically adjusting the frequency response curve of the loudspeaker have the advantages of high adjusting speed, high efficiency, accurate precision, low cost and no need of manual participation, realize the automatic adjustment of the frequency response curve of the loudspeaker and have good adaptability.
Drawings
Fig. 1 is a schematic structural diagram of a system for automatically adjusting a frequency response curve of a speaker according to an embodiment of the present invention.
Fig. 2 is a flowchart of a method for automatically adjusting a frequency response curve of a speaker according to an embodiment of the present invention.
Reference numerals
1 microphone
2 loudspeaker
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to specific embodiments.
The structure of the system for automatically adjusting the frequency response curve of the speaker in this embodiment can be seen from fig. 1, and the system for automatically adjusting the frequency response curve of the speaker includes:
the pickup module is used for receiving the sound emitted by the loudspeaker 2 and converting the sound into corresponding frequency response data;
the automatic adjusting module is used for performing calibration calculation on the frequency response data output by the pickup module to acquire an adjusting amplitude value of the frequency response data;
the sound effect adjusting module is used for adjusting the audio input signal;
the sound effect adjusting module is simultaneously connected with the automatic adjusting module and the loudspeaker 2;
the audio input signal includes several standard signal sources distributed throughout the entire range, and in this embodiment, the audio input signal may include 8 standard signal sources at 8 frequency points, i.e., 125HZ, 250HZ, 500HZ, 1000HZ, 2000HZ, 4000HZ, 8000HZ, and 16000 HZ.
In this embodiment, the sound pickup module, the automatic adjustment module, the sound effect adjustment module and the speaker 2 form a closed loop, the automatic adjustment module reads the frequency response data output from the sound pickup module, and performs corresponding calculation, the calculated adjustment amplitude value is transmitted to the sound effect adjustment module, the sound effect adjustment module adjusts the plurality of standard signal sources one by one according to the adjustment amplitude value, then the adjusted result is transmitted to the speaker 2, the speaker 2 is driven to generate sound, the sound emitted from the speaker 2 is received by the sound pickup module, and after multiple iterations, the frequency response data output from the sound pickup module is finally matched with the frequency response data threshold value preset by the system, thereby completing the whole calibration process.
In the above embodiment, the sound pickup module includes a microphone 1 and an audio analyzer, the microphone 1 is configured to receive the sound emitted from the speaker 2, and the audio analyzer is configured to convert the sound received by the microphone 1 into the frequency response data.
In the above embodiment, the sound effect adjusting module includes:
the sound source input unit is used for transmitting the audio input signal to the sound effect adjusting unit;
and the sound effect adjusting unit is simultaneously connected with the automatic adjusting module and the loudspeaker 2.
In this embodiment, the functions of the microphone 1, the audio analyzer, the sound source input unit, the sound effect adjusting unit and other modules are all implemented by conventional hardware, wherein the functions of the sound source input unit and the sound effect adjusting unit are implemented by a digital power amplifier chip, and the automatic adjusting module in the present invention implements calibration calculation on the frequency response data output by the sound pickup module by combining the digital power amplifier chip with a corresponding software program, so as to obtain the function of adjusting the amplitude value of the frequency response data. The microphone 1 and the audio analyzer function to convert received sound into an electric signal (i.e., frequency response data). Namely, the system for automatically adjusting the frequency response curve of the loudspeaker in the technical scheme is a system which is based on a digital power amplifier chip and is combined with hardware structures such as a microphone 1, a loudspeaker and the like.
In a method for automatically adjusting a frequency response curve of a speaker based on the system in the above embodiment, the method includes:
the automatic adjusting module calculates a corresponding adjusting amplitude value according to the frequency response data output by the pickup module, the sound effect adjusting module adjusts the audio input signal according to the adjusting amplitude value, transmits the adjusted audio input signal to the loudspeaker, and plays the sound corresponding to the adjusted audio input signal through the loudspeaker.
As shown in fig. 2, the method specifically includes the following steps:
(0.1) the sound effect adjusting module transmits the audio input signal to the loudspeaker, namely, when the initial state is calibrated, the sound source input unit outputs the audio input signal to the sound effect adjusting unit, namely, the audio input signals of 8 standard signal sources under 8 frequency points of 125HZ, 250HZ, 500HZ, 1000HZ, 2000HZ, 4000HZ, 8000HZ and 16000HZ are transmitted to the sound effect adjusting unit, and the sound effect adjusting unit transmits the 8 unprocessed standard signal sources to the loudspeaker;
(0.2) the speaker playing a sound corresponding to the audio input signal;
(1) the pickup module receives the sound played by the loudspeaker and converts the sound played by the loudspeaker into corresponding frequency response data;
(2) the automatic adjusting module judges whether the frequency response data is matched with a frequency response data threshold value preset by a system, and specifically comprises the following steps:
(2.1) the automatic adjusting module calculates GAINs corresponding to a plurality of standard signal sources under the current frequency response data, wherein the GAINs of 8 standard signal sources under 8 frequency points of 125HZ, 250HZ, 500HZ, 1000HZ, 2000HZ, 4000HZ, 8000HZ, 16000HZ can be respectively and correspondingly recorded as GAIN1, GAIN2, GAIN3, GAIN4, GAIN5, GAIN6, GAIN7, and GAIN 8;
(2.2) calculating an average value of GAINs corresponding to a plurality of standard signal sources, and obtaining an average GAIN of the audio input signal under the current frequency response data, wherein the average GAIN GAIN can be calculated by the following formula:
(2.3) calculating a difference between the gain corresponding to each standard signal source and the average gain, respectively, to obtain a deviation value of the gain corresponding to each standard signal source, where the deviation values of the gains corresponding to the gains of 8 standard signal sources under 8 frequency points in this embodiment can be calculated by the following formula:
Delta_GAIN1＝GAIN-GAIN1；
Delta_GAIN2＝GAIN-GAIN2；
Delta_GAIN3＝GAIN-GAIN3；
Delta_GAIN4＝GAIN-GAIN4；
Delta_GAIN5＝GAIN-GAIN5；
Delta_GAIN6＝GAIN-GAIN6；
Delta_GAIN7＝GAIN-GAIN7；
Delta_GAIN8＝GAIN-GAIN8；
wherein, Delta _ GAIN1, Delta _ GAIN2, Delta _ GAIN3, Delta _ GAIN4, Delta _ GAIN5, Delta _ GAIN6, Delta _ GAIN7 and Delta _ GAIN8 are respectively the deviation values of GAINs corresponding to the GAINs of 8 standard signal sources under 8 frequency points of 125HZ, 250HZ, 500HZ, 1000HZ, 2000HZ, 4000HZ, 8000HZ and 16000 HZ;
(2.4) selecting a maximum value Max _ Delta _ GAIN of all the deviation values, comparing the maximum value Max _ Delta _ GAIN with a preset deviation threshold value in the automatic regulation module, if the maximum value Max _ Delta _ GAIN of the deviation values is smaller than the deviation threshold value, determining that the frequency response data is matched with a preset frequency response data threshold value of the system, and if not, determining that the frequency response data is not matched with the preset frequency response data threshold value of the system;
(3) if the frequency response data are not matched with the frequency response data threshold value preset by the system, continuing the subsequent step (4), otherwise, completing the adjustment of the frequency response curve of the loudspeaker;
(4) the automatic adjustment module calculates an adjustment amplitude value corresponding to the frequency response data, and in this embodiment, the automatic adjustment module uses a deviation value of a GAIN corresponding to each of the standard signal sources as the adjustment amplitude, that is, in this embodiment, the Delta _ GAIN1, the Delta _ GAIN2, the Delta _ GAIN3, the Delta _ GAIN4, the Delta _ GAIN5, the Delta _ GAIN6, the Delta _ GAIN7, and the Delta _ GAIN8 are used as the adjustment amplitude values corresponding to the frequency response data;
(4.1) inputting the deviation value of the GAIN corresponding to each standard signal source to the sound effect adjusting module, namely inputting the deviation values of the GAINs corresponding to the GAINs of 8 standard signal sources under 8 frequency points of 125HZ, 250HZ, 500HZ, 1000HZ, 2000HZ, 4000HZ, 8000HZ and 16000HZ to the sound effect adjusting module, namely inputting the deviation values of the GAINs corresponding to the GAINs of the 8 standard signal sources under the 8 frequency points of Delta _ GAIN1, Delta _ GAIN2, Delta _ GAIN3, Delta _ GAIN4, Delta _ GAIN5, Delta _ GAIN6, Delta _ GAIN7 and Delta _ GAIN 8;
(5) the audio effect adjusting module adjusts the audio input signal according to the adjusting amplitude value, that is, the audio effect adjusting module adjusts the plurality of standard signal sources one by one according to the adjusting amplitude value and transmits the adjusted audio input signal to the loudspeaker, wherein the adjusting the plurality of standard signal sources one by one according to the adjusting amplitude value is that: the purpose of adjusting the standard signal sources is realized by changing the gain values of 8 standard signal sources in the system into new gains respectively, which is specifically as follows:
GAIN1*＝GAIN1+Delta_GAIN1；
GAIN2*＝GAIN2+Delta_GAIN2；
GAIN3*＝GAIN3+Delta_GAIN3；
GAIN4*＝GAIN4+Delta_GAIN4；
GAIN5*＝GAIN5+Delta_GAIN5；
GAIN6*＝GAIN6+Delta_GAIN6；
GAIN7*＝GAIN7+Delta_GAIN7；
GAIN8*＝GAIN8+Delta_GAIN8；
among them, GAIN1, GAIN2, GAIN4, GAIN5, GAIN6, GAIN7 and GAIN8 are new GAINs of 8 standard signal sources, respectively. (6) And (3) playing corresponding sound by the loudspeaker, and continuing the step (1).
In the method, because the amplification of the signal received from the sound effect adjusting module by the loudspeaker is not linear amplification, the frequency response curve of the loudspeaker can not be adjusted directly according to the adjusting amplitude value obtained by one-time calculation, but the frequency response curve of the loudspeaker is gradually adjusted through one-time iterative calculation, and finally an ideal state is achieved.
As shown in fig. 2, during the initial state of debugging, the automatic adjusting module needs to be initialized, the GAINs and the deviation values of the GAINs corresponding to the standard signal sources recorded in the automatic adjusting module are made to be zero, that is, the GAINs 1, the GAINs 2, the GAINs 3, the GAINs 4, the GAINs 5, the GAINs 6, the GAINs 7 and the GAINs 8 built in the automatic adjusting module are made to be zero, and Delta _ GAIN1, Delta _ GAIN2, Delta _ GAIN3, Delta _ GAIN4, Delta _ GAIN5, Delta _ GAIN6, Delta _ GAIN7 and Delta _ GAIN8 are also made to be zero; and then starting the sound effect adjusting module and the sound pickup module, and then performing the iterative debugging step.
In the above implementation, the sound source input unit continuously and cyclically outputs a plurality of standard signal sources (i.e. audio input signals) distributed throughout the entire range during the calibration process. The audio input signal that audio source input unit output includes the several standard signal source that distributes in whole register, and the several standard signal source is as the signal of waiting to calibrate, does not adjust and control audio source input unit when the calibration, and the audio input signal that just receives in the audio effect adjusting module adjusts after the regulation amplitude value that the automatic adjustment module sent is received to the audio effect adjusting unit in the audio effect adjusting module. In the above embodiment, 8 standard signal sources under 8 frequency points of 125HZ, 250HZ, 500HZ, 1000HZ, 2000HZ, 4000HZ, 8000HZ, and 16000HZ are selected as audio input signals, and in other embodiments, standard signal sources under other frequency points may also be selected as audio input signals.
The system for automatically adjusting the frequency response curve of the loudspeaker in the embodiment is combined with the method for automatically adjusting the frequency response curve of the loudspeaker, the frequency response data of each frequency band is adjusted by adjusting the parameters of the sound effect adjusting part, and the frequency response curve of the loudspeaker can be adjusted into a straight line without manual participation, so that the frequency response curve of the loudspeaker finally reaches the state required by a user, convenience is provided for subsequent sound effect adjustment, and the loudspeaker finally sends an ideal sound effect. The adjusting process is rapid, the accuracy is high, the labor cost is not needed, and the operation is easy.
By adopting the system and the method for automatically adjusting the frequency response curve of the loudspeaker, the automatic adjustment of the frequency response curve of the loudspeaker is realized through the closed-loop design of the pickup module, the automatic adjustment module and the sound effect adjustment module. The system and the method for automatically adjusting the frequency response curve of the loudspeaker can automatically judge whether the adjustment is in place. The system and the method for automatically adjusting the frequency response curve of the loudspeaker have the advantages of high adjusting speed, high efficiency, accurate precision, low cost and no need of manual participation, realize the automatic adjustment of the frequency response curve of the loudspeaker and have good adaptability.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (10)
1. A system for automatically adjusting the frequency response curve of a loudspeaker, said system comprising:
the pickup module is used for receiving the sound emitted by the loudspeaker and converting the sound into corresponding frequency response data;
the automatic adjusting module is used for performing calibration calculation on the frequency response data output by the pickup module to acquire an adjusting amplitude value of the frequency response data;
the sound effect adjusting module is used for adjusting the audio input signal;
the sound effect adjusting module is connected with the automatic adjusting module and the loudspeaker at the same time;
the audio input signal comprises a plurality of standard signal sources distributed over the entire range.
2. The system of claim 1, wherein said pickup module comprises a microphone and an audio analyzer, said microphone is configured to receive sound emitted by said speaker, and said audio analyzer is configured to convert said sound received by said microphone into said frequency response data.
3. The system of claim 1, wherein the prominence adjustment module comprises:
the sound source input unit is used for transmitting the audio input signal to the sound effect adjusting unit;
and the sound effect adjusting unit is simultaneously connected with the automatic adjusting module and the loudspeaker.
4. A method for automatically adjusting a frequency response curve of a speaker based on the system of any one of claims 1 to 3, wherein the method comprises:
the automatic adjusting module calculates a corresponding adjusting amplitude value according to the frequency response data output by the pickup module, the sound effect adjusting module adjusts the audio input signal according to the adjusting amplitude value, transmits the adjusted audio input signal to the loudspeaker, and plays the sound corresponding to the adjusted audio input signal through the loudspeaker.
5. The method as claimed in claim 4, wherein the step of calculating a corresponding adjustment amplitude value by the auto-adjustment module according to the frequency response data output by the sound pickup module, the step of adjusting the audio input signal by the audio effect adjustment module according to the adjustment amplitude value, and transmitting the adjusted audio input signal to the speaker, and the step of playing the sound corresponding to the adjusted audio input signal by the speaker comprises the steps of:
(1) the pickup module receives the sound played by the loudspeaker and converts the sound played by the loudspeaker into corresponding frequency response data;
(2) the automatic adjusting module judges whether the frequency response data is matched with a frequency response data threshold value preset by a system;
(3) if the frequency response data are not matched with the frequency response data threshold value preset by the system, continuing the subsequent step (4), otherwise, completing the adjustment of the frequency response curve of the loudspeaker;
(4) the automatic adjusting module calculates an adjusting amplitude value corresponding to the frequency response data;
(5) the sound effect adjusting module adjusts the audio input signal according to the adjusting amplitude value and transmits the adjusted audio input signal to the loudspeaker;
(6) and (3) playing corresponding sound by the loudspeaker, and continuing the step (1).
6. The method for automatically adjusting the frequency response curve of a speaker according to claim 5, wherein the step (2) comprises the steps of:
(2.1) the automatic adjusting module calculates gains corresponding to the plurality of standard signal sources respectively under the current frequency response data;
(2.2) calculating the average value of gains corresponding to a plurality of standard signal sources, and acquiring the average gain of the audio input signal under the current frequency response data;
(2.3) respectively calculating the difference value between the gain corresponding to each standard signal source and the average gain to obtain the deviation value of the gain corresponding to each standard signal source;
(2.4) selecting the maximum value of all the deviation values, comparing the maximum value with a preset deviation threshold value in the automatic adjusting module, if the maximum value of the deviation values is smaller than the deviation threshold value, determining that the frequency response data is matched with the preset frequency response data threshold value of the system, otherwise, determining that the frequency response data is not matched with the preset frequency response data threshold value of the system.
7. The method as claimed in claim 6, wherein the auto-tuning module calculates the tuning amplitude value corresponding to the frequency response data as:
the automatic adjusting module takes the deviation value of the gain corresponding to each standard signal source as the adjusting amplitude value.
8. The method for automatically adjusting the frequency response curve of a loudspeaker according to claim 7, wherein the following steps are included between the step (4) and the step (5):
(4.1) the automatic adjusting module inputs the deviation value of the gain corresponding to each standard signal source to the sound effect adjusting module.
9. The method as claimed in claim 8, wherein the audio effect adjusting module adjusts the audio input signal according to the adjusted amplitude value as follows:
and the sound effect adjusting module adjusts the plurality of standard signal sources one by one according to the adjusting amplitude value.
10. The method for automatically adjusting the frequency response curve of a speaker according to claim 4, wherein the step (1) is preceded by the steps of:
(0.1) the sound effect adjusting module transmits an audio input signal to the speaker;
(0.2) the speaker playing a sound corresponding to the audio input signal.
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| CN114666631A (en) * | 2020-12-23 | 2022-06-24 | 华为技术有限公司 | Sound effect adjusting method and electronic equipment |
| CN114666631B (en) * | 2020-12-23 | 2024-04-26 | 华为技术有限公司 | Sound effect adjusting method and electronic equipment |
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Address after: 214135 -6, Linghu Avenue, Wuxi Taihu international science and Technology Park, Wuxi, Jiangsu, China, 180 Applicant after: China Resources micro integrated circuit (Wuxi) Co., Ltd Address before: 214135 Jiangsu city of Wuxi province Taihu international science and Technology Park Linghu Road No. 180 -22 Applicant before: WUXI CHINA RESOURCES SEMICO Co.,Ltd. |
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Application publication date: 20200619 |