CN107071654A - A kind of digital noise reduction method, device and a kind of audio-frequence player device - Google Patents
A kind of digital noise reduction method, device and a kind of audio-frequence player device Download PDFInfo
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- CN107071654A CN107071654A CN201710375499.8A CN201710375499A CN107071654A CN 107071654 A CN107071654 A CN 107071654A CN 201710375499 A CN201710375499 A CN 201710375499A CN 107071654 A CN107071654 A CN 107071654A
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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
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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
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a kind of digital noise reduction method, device and a kind of audio-frequence player device.This method includes：Gather the analog signal of ambient noise；Analog signal is amplified；Analog signal after amplification is converted into data signal, and carries out anti-phase processing, anti-phase data signal is obtained, the gain reduction of anti-phase processing to below 0dB；Obtained anti-phase data signal is converted into analog signal, is output to loudspeaker to offset ambient noise；Wherein, the amount of gain amplified to analog signal, the amount of gain to offset anti-phase processing reduction.The present invention passes through before analog-to-digital conversion is carried out to analog signal, add amplification procedure, and the gain of the anti-phase processing of noise signal is reduced to below 0dB, the amount of gain of noise filter reduction is made up by foregoing amplification procedure, gain reach is realized, the entire gain needed for noise reduction had both been ensure that, the noise of analog-to-digital conversion introducing is turn avoid by while amplifying, the signal to noise ratio of system output is improved, Consumer's Experience is improved.
Description
Technical field
The present invention relates to noise reduction technology field, more particularly to a kind of digital noise reduction method, device and a kind of audio are played and set
It is standby.
Background technology
Traditional noise cancelling headphone is realized using analog circuit, it is necessary to build wave filter by complicated hardware circuit, no
But debugging is complicated, and precision is relatively low.With continuing to develop for digital technology, the processing of data signal is also more and more ripe, drop
Earphone of making an uproar starts more generally to carry out noise reduction process using digital technology.Noise filter is changed to after digital filter, greatly
The big debugging process for simplifying noise cancelling headphone, it is only necessary to which changing several parameters in software just can be surveyed, it is to avoid repeat to weld
The cumbersome of hardware circuit is connect, while digital filter precision is very high, it is ensured that uniformity during volume production.
However, processing is filtered by data signal, than being directly filtered many one of processing using analog signal
Step, that is, need to convert analog signals into data signal.The device that analog signal is converted into data signal is called modulus and turned
Parallel operation (Analog-to-Digital Converter, write a Chinese character in simplified form ADC), the data signal after being converted through ADC is input to data signal
Processing (Digital Signal Processing, write a Chinese character in simplified form DSP) chip is handled, then through digital analog converter (Digital-
To-Analog Converter, write a Chinese character in simplified form DAC) be converted to analog signal, for exporting noise reduction, its device block diagram as shown in figure 1,
In the denoising device 100, analog-digital converter 110, digital signal processing chip 120 and digital analog converter 130 are sequentially connected.In number
In word noise-reducing design, noise filter is provided with DSP, to obtain the de-noising signal anti-phase with outside noise, and export to
Loudspeaker offsets noise.Generally for higher noise reduction is obtained, the noise filter of design has very high gain, and highest increases
Benefit is up to more than 20dB, and Fig. 2 is a kind of noise filter curve of digital feedback noise cancelling headphone, it can be seen in fig. 2 that the noise reduction is filtered
Ripple device is up to 30dB or so in the gain of low-frequency range.Fig. 3 is not connect using the denoising device of noise filter shown in Fig. 2
Enter Fourier transformation (Fast Fourier Transformation, write a Chinese character in simplified form FFT) curve of output signal when inputting, it is tested
Equipment is AudioPrecision525 audio analyzers.
As shown in figure 3, in existing digital noise reduction device, digital noise reduction chip is present than larger delay, in noise reduction
Wave filter easily introduces high-frequency noise when designing, and along with ADC noise is exaggerated, causes background noise larger, have impact on whole
The digital noise reduction effect of body.It is, therefore, desirable to provide a kind of method that can reduce digital noise reduction device background noise, to improve drop
Make an uproar effect, improve Consumer's Experience.
The content of the invention
In view of the problem of prior art digital denoising device is present compared with high background noise, it is proposed that one kind numeral of the invention
Noise-reduction method, device and a kind of audio-frequence player device, to overcome above mentioned problem or to solve the above problems at least in part.
To achieve these goals, present invention employs following technical scheme：
According to one aspect of the present invention there is provided a kind of digital noise reduction method, this method includes：
S110, gathers the analog signal of ambient noise；
S120, the analog signal is amplified；
S130, data signal is converted to by the analog signal after amplification, and carries out anti-phase processing, obtains anti-phase numeral
Signal, the gain reduction of anti-phase processing to below 0dB；
S140, is converted to analog signal by obtained anti-phase data signal, is output to loudspeaker to offset ambient noise；
Wherein, the amount of gain amplified in step S120, the amount of gain to offset anti-phase processing reduction in step S130.
Alternatively, in the step s 120, the analog signal is amplified using programmable gain amplifier.
Alternatively, in step S140, before by the analog signal output of conversion to loudspeaker, in addition to step：
S141, the analog signal being converted to is overlapped with audio signal to be played, and the signal after superposition is defeated
Go out to loudspeaker.
According to another aspect of the present invention there is provided a kind of digital noise reduction device, the digital noise reduction device is included successively
Amplifying unit, analog-digital converter, digital signal processing chip and the digital analog converter of connection；
The amplifying unit, the analog signal for receiving ambient noise, the analog signal is amplified, and is sent to institute
State analog-digital converter；
The analog-digital converter, for the analog signal after amplification to be converted into data signal, and is sent to described
Digital signal processing chip；
The digital signal processing chip, for the data signal received to be carried out into anti-phase processing, obtains anti-phase numeral
Signal, and be sent to the digital analog converter, the gain reduction of the digital signal processing chip to below 0dB；
The digital analog converter, for obtained anti-phase data signal to be converted into analog signal, be output to loudspeaker with
Offset ambient noise；
Wherein, the gain amplifier amount of the amplifying unit, the gain to offset the digital signal processing chip reduction
Amount.
Alternatively, the amplifying unit is programmable gain amplifier.
Alternatively, the digital noise reduction device also includes superpositing unit；
The superpositing unit is connected between the digital analog converter and loudspeaker, for receiving the digital analog converter hair
The analog signal sent, and the analog signal is superimposed with audio signal to be played, by the signal output after superposition to loudspeaker.
According to it is still another aspect of the present invention to provide a kind of audio-frequence player device, the audio-frequence player device is included successively
Microphone, amplifying unit, analog-digital converter, digital signal processing chip, digital analog converter and the loudspeaker of connection；
The microphone, for gathering the analog signal of ambient noise, and is sent to the amplifying unit；
The amplifying unit, for the analog signal received to be amplified, and is sent to the analog-to-digital conversion
Device；
The analog-digital converter, for the analog signal after amplification to be converted into data signal, and is sent to described
Digital signal processing chip；
The digital signal processing chip, for the data signal received to be carried out into anti-phase processing, obtains anti-phase numeral
Signal, and be sent to the digital analog converter, the gain reduction of the digital signal processing chip to below 0dB；
The digital analog converter, for obtained anti-phase data signal to be converted into analog signal, be output to loudspeaker with
Offset ambient noise；
The loudspeaker, for playing audio；
Wherein, the gain amplifier amount of the amplifying unit, the gain to offset the digital signal processing chip reduction
Amount.
Alternatively, the amplifying unit is programmable gain amplifier.
Alternatively, the audio-frequence player device also includes superpositing unit；
The superpositing unit is connected between the digital analog converter and the loudspeaker, for receiving the digital-to-analogue conversion
The analog signal that device is sent, and the analog signal is superimposed with audio signal to be played, by the signal output after superposition to raising
Sound device.
Alternatively, the audio-frequence player device is earphone.
In summary, the beneficial effects of the invention are as follows：
Before analog-to-digital conversion is carried out to analog signal, amplification procedure is added, and by the gain of the anti-phase processing of noise signal
Below 0dB is reduced to, the amount of gain of noise filter reduction is made up by foregoing amplification procedure, gain reach is realized, so both
The entire gain needed for noise reduction is ensure that, the noise of analog-to-digital conversion introducing is turn avoid by while amplify, improves the letter of system
Make an uproar and compare, improve Consumer's Experience.
Brief description of the drawings
Fig. 1 is a kind of digital noise reduction device composition schematic diagram of prior art；
Fig. 2 is digital signal processing chip median filter curve map in a kind of digital noise reduction device of prior art；
Fig. 3 is a kind of background noise FFT curve maps of digital noise reduction device of prior art；
Fig. 4 is a kind of digital noise reduction method flow schematic diagram that the embodiment of the present invention one is provided；
Fig. 5 is a kind of digital noise reduction device composition schematic diagram that the embodiment of the present invention two is provided；
Fig. 6 is a kind of digital noise reduction device signal processing schematic diagram that the embodiment of the present invention two is provided；
Fig. 7 is digital signal processing chip median filter song in a kind of digital noise reduction device that the embodiment of the present invention two is provided
Line chart；
Fig. 8 is a kind of background noise FFT curve maps for digital noise reduction device that the embodiment of the present invention two is provided；
Fig. 9 is a kind of audio-frequence player device composition schematic diagram that the embodiment of the present invention three is provided.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
The technical concept of the present invention is, before analog-to-digital conversion is carried out to analog signal, adds amplification procedure, and will be anti-phase
The gain of noise filter is reduced to below 0dB in processing, and the amount of gain of noise filter reduction is made up by foregoing amplification procedure,
The entire gain needed for noise reduction had so both been ensure that, the noise of analog-digital conversion process introducing has been turn avoid by while amplifying, raising
The signal to noise ratio of system.
Referring to figs. 2 and 3 shown, applicant has found in R＆D process, Fig. 3 background noise FFT curves and Fig. 2 filter
Ripple device curve shape is basically identical, is to produce the weight compared with high background noise so as to judge that filter gain makes background noise lifting
Want reason.Because ADC has various noises, such as quantizing noise in itself, these noises can be input in DSP together with signal,
Loudspeaker is output to after filtered device filtering, causes background noise larger, subjective feeling clearly, for example, can be heard when wearing
Larger " rustling " sound, especially when there is higher noise reduction, outside noise is reduced significantly after entering in earphone, background noise
Become big relative to outside noise, masking action of the outside noise to background noise weakens, and background noise is substantially heard.
Embodiment one
In order to solve the above problems, present applicant proposes the digital noise reduction method as shown in Fig. 4 flow charts, as shown in figure 4,
This method comprises the following steps：
Step S110, gathers the analog signal of ambient noise.For example, the simulation for gathering ambient noise using microphone is believed
Number.
Step S120, analog signal is amplified.
Step S130, data signal is converted to by the analog signal after amplification, and carries out anti-phase processing, obtains anti-phase numeral
Signal, the gain reduction of anti-phase processing to below 0dB.
Step S140, is converted to analog signal by obtained anti-phase data signal, is output to loudspeaker and is made an uproar with offsetting environment
Sound.
Wherein, the amount of gain amplified in step S120, the amount of gain to offset anti-phase processing reduction in step S130.
Compared with existing active denoising method, in the application, the gain reduction of the anti-phase processing of data signal to 0dB with
Under so that anti-phase processing procedure does not have signal amplification, in order to make up the amount of gain of reduction, before analog-to-digital conversion is carried out
Analog signal is amplified, gain reach is realized, so both ensure that the amount of gain of whole noise reduction process is constant, avoided again
The noise that analog-digital conversion process is introduced is amplified simultaneously, so as to reduce the background noise of denoising device, improves system defeated
Go out the signal to noise ratio at end, improve Consumer's Experience.
Wherein, for the anti-phase processing of data signal, digital signal processing chip DSP can be used to realize, set in DSP
Digital filter is equipped with, the digital filter is well known to those skilled in the art, and will not be repeated here.
Preferably, in the step s 120, analog signal is amplified using programmable gain amplifier.Programmable-gain
Amplifier (Programmable Gain Amplifier, write a Chinese character in simplified form PGA), is a kind of versatility very strong amplifier, its times magnification
Number can be controlled with program as needed.Analog signal is amplified using programmable-gain flourishing device, multiplication factor
It can flexibly be set by program, be conducive to the adjustment of gain size, accurately to make up the amount of gain of anti-phase process reduction, for example,
As the gain reduction 20dB of digital signal processing chip median filter, the gain of programmable gain amplifier is set by program
It is set to 20dB, then entire gain can keep constant, and the noise reduction to ambient noise is kept.
Preferably, in step S140, before by the analog signal output of conversion to loudspeaker, in addition to step
S141, the analog signal being converted to is overlapped with audio signal to be played, by the signal output after superposition to raising one's voice
Device.
The noise-reduction method of the application can be used for a variety of scenes, for example, the machine that can be used for eliminating in in-car, factory is made an uproar
Sound is there is provided quiet environment, and now handle obtained anti-phase noisy analog signal directly can be played by loudspeaker；Or, can also
Interference for reducing ambient sound when audio is played, such as improves the speech quality in noisy environment, at this point it is possible to will conversion
Obtained analog signal is overlapped with audio signal to be played, by the signal output after superposition to loudspeaker, to offset ring
Border noise, improves speech quality.
Embodiment two
Disclosed herein as well is a kind of digital noise reduction device, it is constituted as shown in figure 5, the digital noise reduction device is included successively
Amplifying unit 540, analog-digital converter 510, digital signal processing chip 520 and the digital analog converter 530 of connection.
Amplifying unit 540, for the analog signal received to be amplified, and is sent to analog-digital converter 510.Environment
The analog signal of noise, can have microphone collection, and be sent to amplifying unit 540.
Analog-digital converter 510, for the analog signal after amplification to be converted into data signal, and is sent at data signal
Manage chip 520.
Digital signal processing chip 520, for the data signal received to be carried out into anti-phase processing, obtains anti-phase numeral letter
Number, and digital analog converter 530 is sent to, the gain reduction of digital signal processing chip 520 is believed to below 0dB in the noise
Number anti-phase processing procedure in, in the absence of the amplification to signal.
Digital analog converter 530, for obtained anti-phase data signal to be converted into analog signal, be output to loudspeaker with to
Disappear ambient noise.
Wherein, the gain amplifier amount of amplifying unit 540, the amount of gain to offset the reduction of digital signal processing chip 520.
The signal processing of the digital noise reduction device 500 as shown in fig. 6, input signal unit amplification amplified first,
Gain amplifier is that the signal after the gain amplification that digital signal processing chip median filter reduces carries out analog-to-digital conversion again, defeated afterwards
Enter to digital signal processing chip and be filtered processing, filter gain is limited in below 0dB, finally by the number after filtering process
Word signal is converted to analog signal output.By above-mentioned signal processing, gain reach is realized, whole noise reduction had both been ensure that
The amount of gain of process is constant, turn avoid the noise of analog-to-digital conversion introducing by while amplifying, the background for reducing denoising device is made an uproar
Sound, improves the signal to noise ratio of device output end, improves Consumer's Experience.
Fig. 7 shows the curve map of noise filter in the digital signal processing chip of the application digital noise reduction device, from
Visible in figure, its gain is in below 0dB, from without signal amplifying function.Fig. 8 is shown using digital noise reduction of the present invention dress
The background noise curve put, test equipment and test condition are equal with Fig. 3, and the wherein gain of amplifying circuit is Digital Signal Processing
The amount of gain that chip median filter reduces, it can be seen that background noise reduction more than the 20dB of digital noise reduction device of the present invention,
It is consistent with the gain that wave filter reduces.
Preferably, in one embodiment of the invention, amplifying unit 540 is programmable gain amplifier.
Preferably, the digital noise reduction device 500 also includes superpositing unit (not shown), and superpositing unit is connected to digital-to-analogue conversion
After device 530, before loudspeaker, for receive digital analog converter 530 transmission analog signal, and by analog signal with it is to be played
Audio signal is superimposed, and the signal output after superposition to loudspeaker is played.
Embodiment three
The invention also discloses a kind of audio-frequence player device, as shown in figure 9, the audio-frequence player device 900 includes connecting successively
The microphone 950 that connects, amplifying unit 940, analog-digital converter 910, digital signal processing chip 920, digital analog converter 930 and raise
Sound device 960.
Microphone 950, for gathering the analog signal of ambient noise, and is sent to amplifying unit 940.
Amplifying unit 940, for the analog signal received to be amplified, and is sent to analog-digital converter 910.
Analog-digital converter 910, for the analog signal after amplification to be converted into data signal, and is sent at data signal
Manage chip 920.
Digital signal processing chip 920, for the data signal received to be carried out into anti-phase processing, obtains anti-phase numeral letter
Number, and it is sent to digital analog converter 930, the gain reduction of digital signal processing chip 920 to below 0dB.
Digital analog converter 930, for obtained anti-phase data signal to be converted into analog signal, is output to loudspeaker 960
To offset ambient noise.
Loudspeaker 960, for playing audio.
Wherein, the gain amplifier amount of amplifying unit 740, the amount of gain to offset the reduction of digital signal processing chip 720.
Preferably, amplifying unit 740 is programmable gain amplifier.
Preferably, the audio-frequence player device 700 also includes superpositing unit (not shown), and superpositing unit is connected to digital-to-analogue conversion
Between device 730 and loudspeaker 760, for receive digital analog converter 730 transmission analog signal, and by analog signal with it is to be played
Audio signal is superimposed, by the signal output after superposition to loudspeaker 760.
Preferably, the audio-frequence player device 700 is earphone, as a result of above-mentioned denoising structure, it is possible to increase call matter
Amount or music quality.
The foregoing is only a specific embodiment of the invention, under the above-mentioned teaching of the present invention, those skilled in the art
Other improvement or deformation can be carried out on the basis of above-described embodiment.It will be understood by those skilled in the art that above-mentioned tool
The purpose of the present invention is simply preferably explained in body description, and protection scope of the present invention should be defined by scope of the claims.
Claims (10)
1. a kind of digital noise reduction method, it is characterised in that this method includes：
S110, gathers the analog signal of ambient noise；
S120, the analog signal is amplified；
S130, data signal is converted to by the analog signal after amplification, and carries out anti-phase processing, obtains anti-phase numeral letter
Number, the gain reduction of anti-phase processing to below 0dB；
S140, is converted to analog signal by obtained anti-phase data signal, is output to loudspeaker to offset ambient noise；
Wherein, the amount of gain amplified in step S120, the amount of gain to offset anti-phase processing reduction in step S130.
2. digital noise reduction method as claimed in claim 1, it is characterised in that in the step s 120, put using programmable-gain
Big device is amplified to the analog signal.
3. digital noise reduction method as claimed in claim 1, it is characterised in that in step S140, believes by the simulation of conversion
Number it is output to before loudspeaker, in addition to step：
S141, the analog signal being converted to is overlapped with audio signal to be played, and the signal output after superposition is arrived
Loudspeaker.
4. a kind of digital noise reduction device, it is characterised in that amplifying unit, the modulus that the digital noise reduction device includes being sequentially connected turn
Parallel operation, digital signal processing chip and digital analog converter；
The amplifying unit, the analog signal for receiving ambient noise, the analog signal is amplified, and is sent to the mould
Number converter；
The analog-digital converter, for the analog signal after amplification to be converted into data signal, and is sent to the numeral
Signal processing chip；
The digital signal processing chip, for the data signal received to be carried out into anti-phase processing, obtains anti-phase data signal,
And it is sent to the digital analog converter, the gain reduction of the digital signal processing chip to below 0dB；
The digital analog converter, for obtained anti-phase data signal to be converted into analog signal, is output to loudspeaker to offset
Ambient noise；
Wherein, the gain amplifier amount of the amplifying unit, the amount of gain to offset the digital signal processing chip reduction.
5. digital noise reduction device as claimed in claim 4, it is characterised in that the amplifying unit is programmable automation controller
Device.
6. digital noise reduction device as claimed in claim 4, it is characterised in that the digital noise reduction device also includes superpositing unit；
The superpositing unit is connected between the digital analog converter and loudspeaker, is sent for receiving the digital analog converter
Analog signal, and the analog signal is superimposed with audio signal to be played, by the signal output after superposition to loudspeaker.
7. a kind of audio-frequence player device, it is characterised in that the audio-frequence player device includes microphone, the amplification list being sequentially connected
Member, analog-digital converter, digital signal processing chip, digital analog converter and loudspeaker；
The microphone, for gathering the analog signal of ambient noise, and is sent to the amplifying unit；
The amplifying unit, for the analog signal received to be amplified, and is sent to the analog-digital converter；
The analog-digital converter, for the analog signal after amplification to be converted into data signal, and is sent to the numeral
Signal processing chip；
The digital signal processing chip, for the data signal received to be carried out into anti-phase processing, obtains anti-phase data signal,
And it is sent to the digital analog converter, the gain reduction of the digital signal processing chip to below 0dB；
The digital analog converter, for obtained anti-phase data signal to be converted into analog signal, is output to loudspeaker to offset
Ambient noise；
The loudspeaker, for playing audio；
Wherein, the gain amplifier amount of the amplifying unit, the amount of gain to offset the digital signal processing chip reduction.
8. audio-frequence player device as claimed in claim 7, it is characterised in that the amplifying unit is programmable automation controller
Device.
9. audio-frequence player device as claimed in claim 7, it is characterised in that the audio-frequence player device also includes superpositing unit；
The superpositing unit is connected between the digital analog converter and the loudspeaker, for receiving the digital analog converter hair
The analog signal sent, and the analog signal is superimposed with audio signal to be played, by the signal output after superposition to loudspeaker.
10. audio-frequence player device as claimed in claim 7, it is characterised in that the audio-frequence player device is earphone.
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| CN108683975A (en) * | 2018-05-14 | 2018-10-19 | 维沃移动通信有限公司 | A kind of audio frequency apparatus |
| CN108834033A (en) * | 2018-05-24 | 2018-11-16 | 深圳普罗声声学科技有限公司 | Noise-reduction method and device, the hearing aid of apparatus for processing audio |
| CN109068215A (en) * | 2018-08-14 | 2018-12-21 | 歌尔科技有限公司 | A kind of noise-reduction method of In-Ear Headphones, device and In-Ear Headphones |
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| CN113327569A (en) * | 2021-05-18 | 2021-08-31 | 杭州爱思维仪器有限公司 | Noise reduction method, system and device for pure-tone audiometer |
| CN115278424A (en) * | 2021-04-29 | 2022-11-01 | Oppo广东移动通信有限公司 | Audio playing method and audio playing device |
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| CN111316355A (en) * | 2017-11-03 | 2020-06-19 | 深圳传音通讯有限公司 | Audio noise reduction method, noise reduction device, mobile terminal and readable storage medium |
| CN108683975A (en) * | 2018-05-14 | 2018-10-19 | 维沃移动通信有限公司 | A kind of audio frequency apparatus |
| CN108834033A (en) * | 2018-05-24 | 2018-11-16 | 深圳普罗声声学科技有限公司 | Noise-reduction method and device, the hearing aid of apparatus for processing audio |
| CN109068215A (en) * | 2018-08-14 | 2018-12-21 | 歌尔科技有限公司 | A kind of noise-reduction method of In-Ear Headphones, device and In-Ear Headphones |
| CN111083250A (en) * | 2018-10-22 | 2020-04-28 | 中兴通讯股份有限公司 | Mobile terminal and noise reduction method thereof |
| CN109495087A (en) * | 2018-12-14 | 2019-03-19 | 深圳先进技术研究院 | Numerical model analysis adaptive notch filter |
| CN111490784A (en) * | 2020-04-23 | 2020-08-04 | 全球能源互联网研究院有限公司 | Analog-to-digital converter and analog-to-digital conversion method |
| CN111490784B (en) * | 2020-04-23 | 2023-05-02 | 全球能源互联网研究院有限公司 | Analog-to-digital converter and analog-to-digital conversion method |
| CN115278424A (en) * | 2021-04-29 | 2022-11-01 | Oppo广东移动通信有限公司 | Audio playing method and audio playing device |
| CN113327569A (en) * | 2021-05-18 | 2021-08-31 | 杭州爱思维仪器有限公司 | Noise reduction method, system and device for pure-tone audiometer |
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