CN102136273B - Audio processing device and method of electronic equipment - Google Patents
Audio processing device and method of electronic equipment Download PDFInfo
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- CN102136273B CN102136273B CN201010001280XA CN201010001280A CN102136273B CN 102136273 B CN102136273 B CN 102136273B CN 201010001280X A CN201010001280X A CN 201010001280XA CN 201010001280 A CN201010001280 A CN 201010001280A CN 102136273 B CN102136273 B CN 102136273B
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Abstract
The invention provides an audio processing device of electronic equipment, comprising a high-frequency noise filtering device and a low-frequency noise filtering device, wherein the high-frequency noise filtering device comprises a first magnetic bead and a second magnetic bead; the low-frequency noise filtering device comprises a first capacitor and a second capacitor for filtering the low-frequency noise of an audio signal. The invention also provides an audio processing method of electronic equipment, comprising the following steps: receiving an audio input signal by the audio input device of the electronic equipment; consuming and adsorbing noise energy in the audio signal by the high-frequency noise filtering device so as to filter the high-frequency noise of the audio signal; and filtering the low-frequency noise of the audio signal by the low-frequency noise filtering device. According to the method and the device for inhibiting audio breakthrough interference, the capability of the electronic product on inhibiting audio breakthrough interference can be obviously improved. According to the method and the device, the function of inhibiting noise is realized by the magnetic beads and the capacitors, and the product design cost is saved.
Description
Technical field
The present invention relates to the Audio Signal Processing field, particularly relate to a kind of audio disturbances restraining device and method of electronic equipment.
Background technology
Because the develop rapidly of modern electronic product, cause very complexity of space electromagnetic environment, abominable.Spacing electromagnetic radiation affects the performance of electronic product greatly, and the interference free performance of electronic product has been proposed higher challenge and requirement.GB17626, IEC61000-4 and EN301489 have detailed regulation to the audio frequency breakthrough performance of electronic product.
It is the ability of weighing the electronic equipment such as mobile phone correct demodulation reception and modulate emission sound signal in the situation that disturbed by outer signals that audio frequency is broken through test.In the prior art, improve the product immunity to interference, the method that suppresses to disturb has:
1, at the beginning of pcb board design, all audio signal wires are all by differential lines, and carry out insulation blocking.This method has certain inhibiting effect to interference, but DeGrain.
2, add common mode inductance at the voicefrequency circuit front end.It can effectively suppress to disturb, and good adaptability is also arranged under the electromagnetic environment of harshness.But it can increase the design cost of product.
This shows that in existing product design, two kinds of methods to the audio frequency that suppresses electronic product is broken through all will pay certain cost, or expense are very high, perhaps effect is undesirable.Therefore need to provide a kind of apparatus for processing audio, when suppressing noise, shorten the propagation distance of noise, prevent noise coupling other circuit in the mobile phone, unpredictable interference occur.In addition, used common mode inductance to suppress to disturb in the prior art, but common mode inductance must adopt the PCB encapsulation, it is high to change device inconvenience and common mode inductance design cost.Therefore, need to provide a kind of encapsulation consistance that has, can replace device easily, the device that adaptability is stronger, have less space and cost expense.
Summary of the invention
For addressing the above problem, first purpose of the present invention provides a kind of for electronic equipment, can filter away high frequency noise and the apparatus for processing audio of low-frequency noise.
Second purpose of the present invention provided a kind of by the adjustment audio loudness, and the audio-frequency processing method that adopts magnetic bead and electric capacity filtering noise in circuit.
For achieving the above object, according to an aspect of the embodiment of the invention, the invention provides a kind of apparatus for processing audio of electronic equipment, described electronic equipment comprises voice input device and audio output device.Described apparatus for processing audio comprises: the first high frequency noise filtering device, described the first high frequency noise filtering device comprises the first magnetic bead and the second magnetic bead that is connected with voice input device, be used for consuming and absorbing the noise energy of audio input signal, process sound signal is carried out the high frequency noise filtering; And the first low-frequency noise filtering device, described the first low-frequency noise filtering device comprises the first electric capacity that is connected with described the first magnetic bead and the second electric capacity that is connected with described the second magnetic bead, is used for that audio input signal is carried out the low-frequency noise filtering and processes.
Above-mentioned apparatus for processing audio also comprises audio loudness adjusting module and automatic gain control module.Wherein, the audio loudness adjusting module is for the reception loudness of the sound signal of adjusting described the first low-frequency noise filtering device output; The automatic gain control module, be connected with described audio loudness adjusting module, also will adjust the sound signal and the predetermined threshold that obtain for the enlargement factor of the sound signal of adjusting the output of audio loudness adjusting module compares, when the amplitude of this sound signal during less than described predetermined threshold, this sound signal filtered make an uproar, when the amplitude of this sound signal during greater than described predetermined amplitude, this sound signal is amplified.
Further, above-mentioned apparatus for processing audio also comprises the second low-frequency noise filtering device, be arranged on described audio output device front end and link to each other with described audio output device, described the second low-frequency noise filtering device comprise the 3rd electric capacity and with the 4th electric capacity, be used for that audio output signal is carried out the low-frequency noise filtering and process.The second high frequency noise filtering device, be arranged on described low-frequency noise filtering device front end and link to each other with described low-frequency noise filtering device, described the second high frequency noise filtering device comprises the 3rd magnetic bead that is connected with the 3rd electric capacity respectively and the 4th magnetic bead that is connected with the 4th electric capacity, be used for consuming and absorbing the noise energy of audio output signal, process sound signal is carried out the high frequency noise filtering.
The audio loudness adjusting module is arranged on described the second low-frequency noise filtering device front end and links to each other with described the second low-frequency noise filtering device, is used for adjusting the transmission loudness of audio output signal.The automatic gain control module, be arranged between described audio loudness adjusting module and the second low-frequency noise filtering device, also will adjust the sound signal and the predetermined threshold that obtain for the enlargement factor of the sound signal of adjusting described audio loudness adjusting module output compares, when the amplitude of this sound signal during less than described predetermined threshold, this sound signal filtered make an uproar, when the amplitude of this sound signal during greater than described predetermined amplitude, this sound signal is amplified, and the signal after will processing outputs to described the second low-frequency noise filtering device.
According to another aspect of the embodiment of the invention, the present invention also provides a kind of audio-frequency processing method of electronic equipment, and described electronic equipment comprises voice input device and audio output device, comprises the steps:
A, by described voice input device audio reception input signal,
B, audio input signal is carried out the high frequency noise filtering process, and;
C, audio input signal is carried out the low-frequency noise filtering process.
Behind step C, further comprise:
The reception loudness of the sound signal after D, the described low-frequency noise filtering of adjustment are processed;
E, by automatic gain control the sound signal after the above-mentioned adjustment is amplified;
F, sound signal and predetermined threshold after will amplifying compare, and when the amplitude of this sound signal during less than described predetermined threshold, this sound signal filtered make an uproar; When the amplitude of sound signal during greater than predetermined threshold, this sound signal is amplified.
Said method comprises the steps: during for the treatment of audio output signal
J, audio output signal is carried out the low-frequency noise filtering process;
K, audio output signal is carried out the high frequency noise filtering process, and;
L, described audio output device output audio signal.
Before described step J, also comprise the steps:
The transmission loudness of G, adjustment audio output signal;
H, by automatic gain control the sound signal after the above-mentioned adjustment is amplified;
I, sound signal and predetermined threshold after will amplifying compare, and when the amplitude of this sound signal during less than described predetermined threshold, this sound signal filtered make an uproar; When the amplitude of sound signal during greater than predetermined threshold, this sound signal is amplified.
Break through method and the device that disturbs according to inhibition audio frequency of the present invention, can significantly improve electronic product and suppress the ability that audio frequency is broken through interference.And the present invention passes through to adopt magnetic bead and electric capacity to realize suppressing the function of noise, with respect to adopting common mode inductance, the design cost of strong adaptability and saving product.
Description of drawings
Fig. 1 is the structured flowchart according to the apparatus for processing audio of the electronic equipment of the embodiment of the invention;
Fig. 2 is the circuit diagram of Fig. 1 sound intermediate frequency treating apparatus;
Fig. 3 is the structured flowchart according to the apparatus for processing audio of the audio output signal of the electronic equipment of the embodiment of the invention;
Fig. 4 is the circuit diagram of the apparatus for processing audio of Fig. 1 sound intermediate frequency output signal;
Fig. 5 is the Frequency Response curve synoptic diagram of magnetic bead among Fig. 1;
Fig. 6 is the Frequency Response curve synoptic diagram of electric capacity among Fig. 1;
Fig. 7 is the audio-frequency processing method process flow diagram according to the embodiment of the invention;
Fig. 8 is the audio-frequency processing method process flow diagram according to the audio frequency output of the embodiment of the invention;
Fig. 9 is audio environment calibration synoptic diagram;
Figure 10 is the conduction interference immunity to interference test synoptic diagram according to the radio frequency electromagnetic field induction of the embodiment of the invention;
Figure 11 is the radio frequency electromagnetic field radiation immunity test synoptic diagram according to the embodiment of the invention;
The conduction interference immunity to interference test result synoptic diagram that Figure 12 responds to for the radio frequency electromagnetic field that does not use the embodiment of the invention;
Figure 13 is not for using the radio frequency electromagnetic field radiation immunity test result synoptic diagram of apparatus of the present invention and method;
Figure 14 is for using the conduction interference immunity to interference test result synoptic diagram of afterwards radio frequency electromagnetic field induction of apparatus of the present invention and method; And
Figure 15 tests the test result synoptic diagram for radio frequency electromagnetic field radiation immunity after using apparatus of the present invention and method.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein identical or similar label represents identical or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
For realizing purpose of the present invention, the invention provides a kind of apparatus for processing audio of electronic equipment.As shown in Figure 1, electronic equipment comprise apparatus for processing audio 100, voice input device 200 wherein apparatus for processing audio 100 comprise the first high frequency noise filtering device 101 and the first low-frequency noise filtering device 102.
Wherein, the first high frequency noise filtering device 101 also comprises the first magnetic bead 101a and the second magnetic bead 101b that is connected with voice input device, is used for consuming and absorbing the noise energy of audio input signal, processes audio input signal is carried out the high frequency noise filtering.In conjunction with shown in Figure 2, voice input device 200 comprises electrode input end 1 and negative input 2.The first magnetic bead 101a links to each other with the electrode input end 1 of voice input device 101, and the second magnetic bead 101b links to each other with the negative input 2 of voice input device 200.In the present embodiment, voice input device 200 is microphone (mic), also can be embodied as other audio frequency entering apparatus.
Wherein, the value of the first magnetic bead 101a and the second magnetic bead 101b is 10000hm100MHz, and its Frequency Response curve as shown in Figure 5.As shown in Figure 5, when magnetic bead was positioned at 1 to 100MHz in frequency, impedance increased with frequency, and frequency is after 100MHz, and impedance is successively decreased with the frequency increase.
Apparatus for processing audio 100 also comprises the first low-frequency noise filtering device 102, the first low-frequency noise filtering device 102 also comprises the first electric capacity 102a that is connected with the first magnetic bead 101a, the the second electric capacity 102b that is connected with the second magnetic bead 101b is used for that audio input signal is carried out the low-frequency noise filtering and processes.In conjunction with shown in Figure 2, the end of the first electric capacity 102a links to each other with the first magnetic bead 101a, the other end be connected publicly.The end of the second electric capacity 102b links to each other with the second magnetic bead 101b, the other end be connected publicly.Fig. 6 shows electric capacity Frequency Response curve.As shown in Figure 6, along with the increase of frequency, because the stray inductance effect that exists in the practical application circuit, when frequency was elevated to certain value, the impedance meeting of electric capacity strengthened along with the increase of frequency.Because the frequency of operation of the power amplifier of voicefrequency circuit is about 650KHz, therefore selecting electric capacity is the electric capacity of 6.8nF, and thus, signal integrity that can holding circuit is in order to avoid the harmonic components of useful signal in the filtering circuit.
The apparatus for processing audio that adopts the embodiment of the invention to offer, magnetic bead 101a, 101b and electric capacity 102a, 102b be arranged on voice input device 200 just/negative input end after, by this setting, when suppressing noise, shorten the propagation distance of noise, prevent noise coupling other circuit in the mobile phone, unpredictable interference occurs.
In addition, the effective noise signal in the filtering audio input signal of this apparatus for processing audio.Because magnetic bead and electric capacity are generic encapsulation, so the device that the embodiment of the invention provides also has the encapsulation consistance, can replace device easily.Although used in the prior art common mode inductance to suppress to disturb, common mode inductance must adopt the PCB encapsulation, it is high to change device inconvenience and common mode inductance design cost.Adopt the solution of the present invention, adaptability is stronger, saves cost, greatly improves the ability of maintenance of portable terminal.
Preferably, as shown in Figure 1, apparatus for processing audio 100 also comprises audio loudness adjusting module 300 and automatic gain control module 400.Audio loudness adjusting module 300, be arranged on the first low-frequency noise filtering device 102 front ends and link to each other with the first low-frequency noise filtering device 102, be used for the reception loudness of the sound signal of adjustment the first low-frequency noise filtering device 102 outputs, make it reach satisfactory loudness.Wherein, satisfactory audio frequency receive loudness be less than approximately-13dB.
In the present embodiment, audio loudness adjusting module 300 adopts codec scrambler 301 and AP multiplier (-icator) 302.By adjust corresponding codec gain and AP gain reach audio frequency reception loudness less than approximately-13dB.
Audio loudness adjusting module 300 further is connected to automatic gain module 400, and the sound signal of output is sent to automatic gain control module 400.Automatic gain control module 400 is adjusted the enlargement factor of the signal that receives and will be adjusted the sound signal and the predetermined threshold that obtain and compares.When the amplitude of this sound signal during less than described predetermined threshold, this sound signal filtered make an uproar, when the amplitude of this sound signal during greater than described predetermined amplitude, this sound signal is amplified;
Wherein predetermined threshold is the predefined normal audio signal amplitude of automatic gain control module, and it can be the value of selecting with the system demand according to actual needs.
Adjust the loudness of audio input signals by audio loudness adjusting module 300 and automatic gain module 400, and sound signal is amplified, noise signal and available signal are further distinguished, be convenient to the noise in the filtering sound signal
Fig. 3 shows the structured flowchart of the apparatus for processing audio of electronic equipment audio output signal.
As shown in Figure 3, electronic equipment also comprises audio output device 500, and wherein apparatus for processing audio 100 comprises the second low-frequency noise filtering device 103 and the second high frequency noise filtering device 104.
Apparatus for processing audio 100 also comprises the second low-frequency noise filtering device 103, is arranged on the front end of audio output device 500 and links to each other with audio output device 500.The second low-frequency noise filtering device 103 comprise the 3rd electric capacity 103a and with the 4th electric capacity 103b, be used for that audio output signal is carried out the low-frequency noise filtering and process.
Fig. 6 shows electric capacity Frequency Response curve.As shown in Figure 6, along with the increase of frequency, because the stray inductance effect that exists in the practical application circuit, when frequency was elevated to certain value, the impedance meeting of electric capacity strengthened along with the increase of frequency.Because the frequency of operation of the power amplifier of voicefrequency circuit is about 650KHz, therefore selecting electric capacity is the electric capacity of 6.8nF, and thus, signal integrity that can holding circuit is in order to avoid the harmonic components of useful signal in the filtering circuit.
In the present embodiment, audio output device 500 is receiver, also can be embodied as other audio output device spares.
Apparatus for processing audio 100 also comprises the second high frequency noise filtering device 104, is arranged on the front end of the second low-frequency noise filtering device 103 and links to each other with the second low-frequency noise filtering device 103.The second high frequency noise filtering device 104 comprises the 3rd magnetic bead 104a that is connected with the 3rd electric capacity 103a respectively and the 4th magnetic bead 104b that is connected with the 4th electric capacity 103b, be used for consuming and absorbing the noise energy of audio output signal, process sound signal is carried out the high frequency noise filtering.In conjunction with shown in Figure 4, audio output device 500 comprises electrode input end 1 and negative input 2.The 3rd magnetic bead 104a links to each other with the electrode input end 1 of audio output device 500, and the 4th magnetic bead 104 links to each other with the negative input 2 of audio output device 500.
The apparatus for processing audio that adopts the embodiment of the invention to offer, electric capacity 103a, 103b magnetic bead and 104a, 104b are arranged on the front end of audio output device 500, arrange by this, further the noise in the filtering audio output signal.
In addition, the effective noise signal in the filtering audio output signal of this apparatus for processing audio.Because magnetic bead and electric capacity are generic encapsulation, so the device that the embodiment of the invention provides also has the encapsulation consistance, can replace device easily.Although used in the prior art common mode inductance to suppress to disturb, common mode inductance must adopt the PCB encapsulation, it is high to change device inconvenience and common mode inductance design cost.Adopt the solution of the present invention, adaptability is stronger, saves cost, greatly improves the ability of maintenance of portable terminal.
Preferably, as shown in Figure 3, apparatus for processing audio 100 also comprises audio loudness adjusting module 300 and automatic gain control module 400.Audio loudness adjusting module 300 is arranged on described the second low-frequency noise filtering device 103 front ends and links to each other with described the second low-frequency noise filtering device 103, is used for adjusting the transmission loudness of audio output signal; Make it reach satisfactory loudness.Wherein, satisfactory audio frequency transmission loudness is less than about 8 ± 3dB.
In the present embodiment, audio loudness adjusting module 300 adopts codec scrambler 301 and AP multiplier (-icator) 302.Reach audio frequency reception loudness less than about 8 ± 3dB by adjusting corresponding codec gain and AP gain.
Audio loudness adjusting module 300 further is connected to automatic gain module 400, and the sound signal of output is sent to automatic gain control module 400.Automatic gain control module 400 is arranged between audio loudness adjusting module 300 and the second low-frequency noise filtering device 103.Automatic gain control module 400 is adjusted the enlargement factor of the signal that receives and will be adjusted the sound signal and the predetermined threshold that obtain and compares.When the amplitude of this sound signal during less than described predetermined threshold, this sound signal filtered make an uproar, when the amplitude of this sound signal during greater than described predetermined amplitude, this sound signal is amplified.And the signal after will processing outputs to the second low-frequency noise filtering device 103.
Wherein predetermined threshold is the predefined normal audio signal amplitude of automatic gain control module, and it can be the value of selecting with the system demand according to actual needs.
Adjust the loudness of audio input signals by audio loudness adjusting module 300 and automatic gain module 400, and sound signal is amplified, noise signal and available signal are further distinguished, be convenient to the noise in the filtering sound signal
The apparatus for processing audio that the embodiment of the invention provides shortens the propagation distance of noise when suppressing noise, prevent noise coupling other circuit in the mobile phone, unpredictable interference occurs.In addition, the effective noise signal in filtering audio input signal and the audio output signal of this apparatus for processing audio.Because magnetic bead and electric capacity are generic encapsulation, so the device that the embodiment of the invention provides also has the encapsulation consistance, can replace device easily.Although used in the prior art common mode inductance to suppress to disturb, common mode inductance must adopt the PCB encapsulation, it is high to change device inconvenience and common mode inductance design cost.Adopt the solution of the present invention, adaptability is stronger, saves cost, greatly improves the ability of maintenance of portable terminal.
The embodiment of the invention also provides a kind of audio-frequency processing method of electronic equipment, and as shown in Figure 7, the method comprises the steps:
A, by the voice input device audio reception input signal of electronic equipment.
Wherein, comprise high frequency noise and low-frequency noise in the audio input signal.Need to adopt following steps that it is carried out filtering.
B, sound signal is carried out the high frequency noise filtering process; For example can utilize the high frequency noise filtering device that links to each other with voice input device to consume and absorb noise energy in the sound signal, process sound signal is carried out the high frequency noise filtering.
In the present embodiment, adopt magnetic bead as high frequency noise filtering device, the noise energy in consumption and the absorption sound signal.This is the operating characteristic of utilizing magnetic bead, and when frequency was higher than 100MHz, its impedance enlarged markedly with the increase of frequency.Because magnetic bead is energy dissipation device, it absorbs the noise energy consumption in the circuit by form of heat.The magnetic bead of large resistance can be accelerated the consumption of energy in circuit in fact.In addition, choosing of magnetic bead, need to take into account simultaneously the basic circuit parameters such as electric current that signal integrity and magnetic bead itself bear, guarantee the harmless transmission of available signal in the circuit.For example can use the first magnetic bead 101a and the second magnetic bead 101b.The first magnetic bead 101a links to each other with the electrode input end 1 of voice input device 200, and the second magnetic bead 101b links to each other with the negative input 2 of voice input device 200.
C, sound signal is carried out the low-frequency noise filtering process, for example can utilize the low-frequency noise filtering device that links to each other with described high frequency noise filtering device that sound signal is carried out low-frequency noise filtering processing.
In the present embodiment, adopt electric capacity as low-frequency noise filtering device.This is resistance low frequency, the characteristic of logical high frequency, effectively the filtering low-frequency noise signal that utilizes electric capacity.For example can use the first electric capacity 102a and 102b, the first magnetic bead 101a is connected with the first electric capacity 102a, the second magnetic bead 101b is connected with the second electric capacity 102b, so that filtering low-frequency noise signal.
By above-mentioned steps A, step B and step C, the effectively HF noise signal of filtering audio input signal and low-frequency noise signal.
In addition, method can also comprise the steps according to an embodiment of the invention, in order to make an uproar to further filtering by the sound signal that obtains after high frequency noise filtering device and the low-frequency noise filtering device.
The method is also comprising step D behind the execution in step C: the reception loudness of adjusting the sound signal after the low-frequency noise filtering is processed.
By adjusting CODEC gain and AP gain, make this audio frequency receive loudness less than approximately-13dB, obtain thus need to loudness.But, although receiving loudness, audio frequency reaches requirement, still there is noise in sound signal after adjusting, and then enters step e.
E, by automatic gain control the sound signal after the above-mentioned adjustment is amplified.
Because still there is noise in sound signal after adjusting, adopt automatic gain control to adjust the enlargement factor of above-mentioned signal, after this enter step F.
F, sound signal and predetermined threshold after will amplifying compare, and when the amplitude of this sound signal during less than described predetermined threshold, this sound signal filtered make an uproar; When the amplitude of sound signal during greater than predetermined threshold, this sound signal is amplified.
Wherein predetermined threshold is the predefined normal audio signal amplitude of automatic gain control module, and it can be the value of selecting with the system demand according to actual needs.
By making sound signal through after the processing of described step D-E, can further filtering low-frequency noise, obtain needed sound signal.
Below described the method for audio input signal being disturbed inhibition and noise filtering, especially, method can also be carried out noise filtering to audio output signal according to an embodiment of the invention, particularly echo filtering operation.
Specifically, as shown in Figure 8, audio-frequency processing method of the present invention can also comprise step J: audio output signal is carried out the low-frequency noise filtering process.For example can utilize low-frequency noise filtering device that sound signal is carried out the low-frequency noise filtering processes.
In the present embodiment, adopt electric capacity as low-frequency noise filtering device.This is resistance low frequency, the characteristic of logical high frequency, effectively the filtering low-frequency noise signal that utilizes electric capacity.For example, can use the 3rd electric capacity 103a and with the 4th electric capacity 103b audio output signal is carried out the low-frequency noise filtering and process.
K, audio output signal is carried out the high frequency noise filtering process.
For example can utilize the high frequency noise filtering device that links to each other with low-frequency noise filtering device to consume and absorb noise energy in the sound signal, process sound signal is carried out the high frequency noise filtering.
In the present embodiment, adopt magnetic bead as high frequency noise filtering device, the noise energy in consumption and the absorption sound signal.This is the operating characteristic of utilizing magnetic bead, and when frequency was higher than 100MHz, its impedance enlarged markedly with the increase of frequency.Because magnetic bead is energy dissipation device, it absorbs the noise energy consumption in the circuit by form of heat.The magnetic bead of large resistance can be accelerated the consumption of energy in circuit in fact.In addition, choosing of magnetic bead, need to take into account simultaneously the basic circuit parameters such as electric current that signal integrity and magnetic bead itself bear, guarantee the harmless transmission of available signal in the circuit.For example can use the 3rd magnetic bead 104a and the 4th magnetic bead 104b.The 3rd magnetic bead 104a links to each other with the electrode input end of audio output device 500, and the 4th magnetic bead 104b links to each other with the negative input of audio output device 500.
L, audio output device output audio signal.
Sound signal after the above-mentioned high frequency noise processing is sent to audio output device, and output.
Preferably, before execution in step J, also comprise the steps:
Step G: the transmission loudness to the sound signal of the audio output device of electronic equipment is adjusted, and by adjusting CODEC gain and AP gain, makes this audio frequency send loudness 8 ± 3dB, obtain thus need to loudness.But, although sending loudness, audio frequency reaches requirement, still there is noise in sound signal after adjusting, and then enters step H.
H, by automatic gain control the sound signal after the above-mentioned adjustment is amplified.
Because still there is noise in sound signal after adjusting, adopt automatic gain control to adjust the enlargement factor of above-mentioned signal, then enter step I.
I, sound signal and predetermined threshold after will amplifying compare, and when the amplitude of this sound signal during less than predetermined threshold, this sound signal filtered make an uproar; When the amplitude of sound signal during greater than predetermined threshold, this sound signal is amplified.
Fig. 9 shows calibration and shows frame intention, and the calibration of sound signal is divided into up calibration and descending calibration.At first audio environment is carried out up calibration, the sounding reference point EUT place in correcting device, input parameter is-5dBPa the sound source of 1KHz.Correcting device is connected to audio output, is 1KHz through centre frequency, and the bandpass filter of bandwidth 200Hz further is connected to audio analyzer.Audio analyzer is read audio level, and this audio level is up datum.
Then audio environment is carried out descending calibration.At sense of hearing reference point ERP place, produce 0dBPa, the sound source of 1KHz.This sound source is by sonic tube, and sonic tube is connected with a converter.It is 1KHz that this converter is connected to centre frequency, the bandpass filter of bandwidth 200Hz.This bandpass filter further is connected to audio analyzer.Audio analyzer is read audio level, and this audio level is the descending reference level.
By above-mentioned calibration to audio environment, obtain up datum and descending reference level.Obtain test macro ground unrest and datum thereby reach.Audio input signal and up datum after apparatus for processing audio 100 processing are compared, audio output signal and descending reference level after apparatus for processing audio 100 processing are compared, take datum as criterion, judge whether the audio frequency immunity to interference of mobile phone is qualified.
The below tests (RS test) to the conducted immunity test (CS test) and the radio frequency electromagnetic field radiation immunity that adopt sound signal behind the above-mentioned audio-frequency processing method to carry out the radio-frequency electromagnetic induction.Figure 10 and Figure 11 show respectively the test synoptic diagram of CS test and RS test.
As shown in Figure 7, CS test comprises that utility appliance 1 is connected to tested equipment by coupling and decoupling network (CDN), wherein is coupled to be connected CDN with decoupling network) the resistance T of one 50 ohm of connections.Tested equipment is placed on the high support of 0.1m.Tested equipment further is connected to utility appliance 2 by coupling and decoupling network (CDN).Wherein, CDN is connected in the coupling that is connected with utility appliance 2 with decoupling network) further connect power attenuator T2, the power attenuation amplitude is 6dB.Power attenuator T2 is connected to radio-frequency signal generator by test signal generator.Finish the conducted immunity test that the sound signal radio-frequency electromagnetic is responded to by the said equipment.
As shown in figure 10, the RS testing apparatus is anechoic chamber.The RS testing apparatus is connected to audio output, is 1KHz through centre frequency, and the bandpass filter of bandwidth 200Hz further is connected to audio analyzer.Be connected with a converter by sonic tube at sense of hearing reference point ERP place.It is 1KHz that this converter is connected to centre frequency, the bandpass filter of bandwidth 200Hz.This bandpass filter further is connected to audio analyzer.Finish by the said equipment the sound signal radio frequency electromagnetic field radiation immunity is tested.
In conjunction with Figure 10 and Figure 11, in test process, neighbourhood noise is coupled to the cell-phone function circuit through the stube cable coupling of mobile phone itself or by space radiation, causes the handset audio hydraulic performance decline.The purpose of test just is to check the immunity to interference of handset audio performance, i.e. inhibition ability to disturbing.
Figure 12 and Figure 13 show respectively the conduction interference immunity to interference test result of the radio frequency electromagnetic field induction of not using the embodiment of the invention and do not use apparatus of the present invention and the radio frequency electromagnetic field radiation immunity test result of method.
As shown in Figure 12, when the frequency of sound signal is positioned at 10M to the 30M scope, still there is noise signal.Can draw thus, only utilize the voicefrequency circuit of electronic equipment itself can't this part noise signal of establishment, need the additional noise filtering circuit.
As shown in Figure 13, when the frequency of sound signal is positioned at 80M to the 2.7G scope, still there is noise signal.Can draw thus, only utilize the voicefrequency circuit of electronic equipment itself can't this part noise signal of establishment, need the additional noise filtering device.
As seen, the voicefrequency circuit of electronic equipment itself is the filtering noise signal fully, needs the additional noise filtering device, and noise is suppressed, and voicefrequency circuit can normally effectively be worked, and does not affect the serviceability of voicefrequency circuit.
Figure 14 and Figure 15 show portable terminal CS test result synoptic diagram and the RS test result synoptic diagram after use apparatus of the present invention and the method.
Contrast Figure 12 and Figure 13 are as can be known, after the method that the employing embodiment of the invention provides, the noise signal of corresponding band obviously is inhibited, thereby can provide higher speech quality, in addition because after the present invention adopts magnetic bead and capacitive means to be arranged on voice input device, therefore can obtain to have saved space expense and cost expense in the noise suppression effect preferably, and can be when suppressing noise, shorten the propagation distance of noise, prevent noise coupling other circuit in the mobile phone, unpredictable interference occurs.
One of ordinary skill in the art will appreciate that and realize that all or part of step that above-described embodiment method is carried is to come the relevant hardware of instruction to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises step of embodiment of the method one or a combination set of when carrying out.
In addition, each functional unit in each embodiment of the present invention can be integrated in the processing module, also can be that the independent physics of unit exists, and also can be integrated in the module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If described integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.
The above-mentioned storage medium of mentioning can be ROM (read-only memory), disk or CD etc.
More than disclosed only be the preferred embodiments of the present invention, certainly can not limit the scope of the present invention with this.Be appreciated that the equivalent variations of doing according to the present invention's essence defined in the appended claims and scope, still belong to the scope that the present invention is contained.
Claims (13)
1. the apparatus for processing audio of an electronic equipment is characterized in that, described electronic equipment comprises voice input device and audio output device; Described apparatus for processing audio comprises:
The first high frequency noise filtering device, described the first high frequency noise filtering device comprises the first magnetic bead and the second magnetic bead that is connected with voice input device, be used for consuming and absorbing the noise energy of audio input signal, process audio input signal is carried out the high frequency noise filtering; And
The first low-frequency noise filtering device, described the first low-frequency noise filtering device comprise the first electric capacity that is connected with described the first magnetic bead and the second electric capacity that is connected with described the second magnetic bead, are used for that audio input signal is carried out the low-frequency noise filtering and process;
Described device also comprises audio loudness adjusting module and automatic gain control module,
Described audio loudness adjusting module is for the reception loudness of the sound signal of adjusting described the first low-frequency noise filtering device output;
Described automatic gain control module, be connected with described audio loudness adjusting module, also will adjust the sound signal and the predetermined threshold that obtain for the enlargement factor of the sound signal of adjusting described audio loudness adjusting module output compares, when the amplitude of this sound signal during less than described predetermined threshold, this sound signal filtered make an uproar, when the amplitude of this sound signal during greater than described predetermined amplitude, this sound signal is amplified.
2. apparatus for processing audio as claimed in claim 1 is characterized in that, described device also comprises:
The second low-frequency noise filtering device, be arranged on described audio output device front end and link to each other with described audio output device, described the second low-frequency noise filtering device comprise the 3rd electric capacity and with the 4th electric capacity, be used for that audio output signal is carried out the low-frequency noise filtering and process;
The second high frequency noise filtering device, be arranged on described the second low-frequency noise filtering device front end and link to each other with described the second low-frequency noise filtering device, described the second high frequency noise filtering device comprises the 3rd magnetic bead that is connected with the 3rd electric capacity respectively and the 4th magnetic bead that is connected with the 4th electric capacity, be used for consuming and absorbing the noise energy of audio output signal, process sound signal is carried out the high frequency noise filtering.
3. apparatus for processing audio as claimed in claim 2 is characterized in that,
Described audio loudness adjusting module is arranged on described the second low-frequency noise filtering device front end and links to each other with described the second low-frequency noise filtering device, is used for adjusting the transmission loudness of audio output signal;
Described automatic gain control module, be arranged between described audio loudness adjusting module and the second low-frequency noise filtering device, also will adjust the sound signal and the predetermined threshold that obtain for the enlargement factor of the sound signal of adjusting described audio loudness adjusting module output compares, when the amplitude of this sound signal during less than described predetermined threshold, this sound signal filtered make an uproar, when the amplitude of this sound signal during greater than described predetermined amplitude, this sound signal is amplified, and the signal after will processing outputs to described the second low-frequency noise filtering device.
4. apparatus for processing audio as claimed in claim 1 is characterized in that, described voice input device comprises electrode input end and negative input, and described electrode input end is connected to described the first magnetic bead, and described the first magnetic bead further connects described the first electric capacity;
Described negative input is connected to described the second magnetic bead, and described the second magnetic bead further connects described the second electric capacity,
Described the first and second electric capacity are connected with described audio loudness adjusting module.
5. apparatus for processing audio as claimed in claim 3 is characterized in that, described audio output device comprises electrode input end and negative input,
Described automatic gain control module is connected with described the 3rd electric capacity, and described the 3rd electric capacity further is connected to described the 3rd magnetic bead, and described the 3rd magnetic bead links to each other with described audio output device electrode input end,
Described audio loudness adjusting module is connected with described the 4th electric capacity, and described the 4th electric capacity further is connected to described the 4th magnetic bead, and described the 4th magnetic bead links to each other with described audio output device negative input.
6. such as claim 1 or 3 described apparatus for processing audio, it is characterized in that described audio loudness adjusting module comprises CODEC scrambler and AP multiplier (-icator).
7. apparatus for processing audio as claimed in claim 1 is characterized in that, described audio loudness adjusting module is adjusted audio frequency, and to receive loudness be less than-13dB.
8. apparatus for processing audio as claimed in claim 3 is characterized in that, it is 8 ± 3dB that described audio loudness adjusting module is adjusted audio frequency transmission loudness.
9. the audio-frequency processing method of an electronic equipment, described electronic equipment comprises voice input device and audio output device, it is characterized in that, comprises the steps:
A, by described voice input device audio reception input signal,
B, audio input signal is carried out the high frequency noise filtering process, and;
C, audio input signal is carried out the low-frequency noise filtering process.
The reception loudness of the sound signal after D, the described low-frequency noise filtering of adjustment are processed;
E, by automatic gain control the sound signal after the above-mentioned adjustment is amplified;
F, sound signal and predetermined threshold after will amplifying compare, and when the amplitude of this sound signal during less than described predetermined threshold, this sound signal filtered make an uproar; When the amplitude of sound signal during greater than predetermined threshold, this sound signal is amplified.
10. audio-frequency processing method as claimed in claim 9 is characterized in that, described method also comprises the steps:
J, audio output signal is carried out the low-frequency noise filtering process;
K, audio output signal is carried out the high frequency noise filtering process, and;
L, described audio output device output audio signal.
11. audio-frequency processing method as claimed in claim 10 is characterized in that, also comprises the steps: before described step J
The transmission loudness of G, adjustment audio output signal;
H, by automatic gain control the sound signal after the above-mentioned adjustment is amplified;
I, sound signal and predetermined threshold after will amplifying compare, and when the amplitude of this sound signal during less than described predetermined threshold, this sound signal filtered make an uproar; When the amplitude of sound signal during greater than predetermined threshold, this sound signal is amplified.
12. audio-frequency processing method as claimed in claim 9 is characterized in that, described audio frequency receives the loudness set-up procedure and adjusts audio frequency to receive loudness be less than-13dB.
13. audio-frequency processing method as claimed in claim 11 is characterized in that, it is 8 ± 3dB that described audio frequency sends loudness set-up procedure adjustment audio frequency transmission loudness.
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| CN102970396B (en) * | 2012-05-16 | 2016-01-27 | 深圳凯虹移动通信有限公司 | A kind of audio frequency processing circuit and communicating terminal |
| CN104156740A (en) * | 2014-07-31 | 2014-11-19 | 广东顺德中山大学卡内基梅隆国际联合研究院 | Signal noise elimination method used for RFID, and device and circuit thereof |
| CN104485911A (en) * | 2014-12-01 | 2015-04-01 | 上海斐讯数据通信技术有限公司 | Mobile terminal and volume adjustment method thereof |
| CN104469615A (en) * | 2014-12-15 | 2015-03-25 | 上海华勤通讯技术有限公司 | Terminal device and earphone circuit thereof |
| CN107123418B (en) * | 2017-05-09 | 2020-12-25 | 广东小天才科技有限公司 | Voice message processing method and mobile terminal |
| CN107592591A (en) * | 2017-07-21 | 2018-01-16 | 深圳天珑无线科技有限公司 | Filter circuit and its application process, the device and electronic installation with store function |
| CN110113469B (en) * | 2019-05-07 | 2021-07-06 | 惠州Tcl移动通信有限公司 | Circuit for testing voice breakthrough signal and measuring method thereof |
| CN112669872B (en) * | 2021-03-17 | 2021-07-09 | 浙江华创视讯科技有限公司 | Audio data gain method and device |
| CN114898732B (en) * | 2022-07-05 | 2022-12-06 | 深圳瑞科曼环保科技有限公司 | Noise processing method and system capable of adjusting frequency range |
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