CN108174007A - A kind of audio system, audio control method and the mobile terminal with the system - Google Patents
A kind of audio system, audio control method and the mobile terminal with the system Download PDFInfo
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- CN108174007A CN108174007A CN201711457525.8A CN201711457525A CN108174007A CN 108174007 A CN108174007 A CN 108174007A CN 201711457525 A CN201711457525 A CN 201711457525A CN 108174007 A CN108174007 A CN 108174007A
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- 238000012545 processing Methods 0.000 claims abstract description 43
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 230000008859 change Effects 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 14
- 230000008030 elimination Effects 0.000 claims description 12
- 238000003379 elimination reaction Methods 0.000 claims description 12
- 230000009467 reduction Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
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- 238000009825 accumulation Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000009514 concussion Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
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- 230000005611 electricity Effects 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
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- 238000006243 chemical reaction Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/26—Pre-filtering or post-filtering
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
- G10L21/0216—Noise filtering characterised by the method used for estimating noise
- G10L21/0232—Processing in the frequency domain
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computational Linguistics (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Quality & Reliability (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The present invention provides a kind of audio system and audio control method and the mobile terminal with the audio system, a kind of audio system including, voltage input end, input one first electric signal, and the audio system further includes：Digital filter, between the voltage input end and audio frequency processing circuit, the digital filter connects voltage input end, it receives first electric signal and is converted into one first digital signal, the digital filter connects audio frequency processing circuit, data transmission interface is additionally provided on the digital filter, for being connect with smart machine, one Frequency point is set by smart machine, the wave filter receives the Frequency point by the data transmission interface, the wave filter generates the second digital signal after wave band of first digital signal below the Frequency point is filtered off and is converted into the second electric signal, use foregoing invention, the debugging of audio can be freely carried out according to user demand, modulate the band po sition filtered off and length.
Description
Technical field
The present invention relates to audio debugging field more particularly to a kind of audio system, audio control method and with the audio
The mobile terminal of system.
Background technology
Currently, intelligent terminal such as smart mobile phone, tablet computer have become an essential part in people's life, intelligence
Can the function of mobile phone also become stronger and stronger, can only make a phone call from pervious, the broadcasting music till now of sending short messages, play and regard
Frequently, bluetooth, take pictures, surf the Internet, reading, the function of smart mobile phone becomes stronger and stronger, while people are for smart mobile phone
The requirement of music effect is also higher and higher, and under such overall background, manufacturer will have centainly in addition to the loudspeaker for mobile phone
Control other than, also to have certain requirement for the debugging of Mobile phone horn, the two combines, and loudspeaker can just be made to play it maximum
Effect.
In the prior art, resistance capacitance mainly is set in the front end of audio system for the filtering of the wave band of audio system
The problem of high-pass filter all filters off the low-frequency band of electric signal, and such setting can be brought is the filter of resistance capacitance high pass
Wave device all filters out all low frequencies so that and the space of debugging becomes very little, due to increasing resistance and capacitance in front end,
The difficulty of maintenance is increased in different sound quality demands, the project of different low frequency point demands.
For this reason, it may be necessary to a kind of audio system can filter off the low-frequency band for needing to filter off, Ke Yi acording to the requirement of user
Under the requirement of different sound quality, freely convert low frequency and filter off point, and included calibration network.
Invention content
In order to overcome above-mentioned technological deficiency, the purpose of the present invention is to provide a kind of audio system, audio control method and
Mobile terminal with the audio system.
The invention discloses a kind of audio system, audio control method and the mobile terminals with the audio system, a kind of
Audio system, including：
Voltage input end inputs one first electric signal；
Audio frequency processing circuit is connect with voltage input end, receives the signal from voltage input end,
Voltage output end is connect with audio frequency processing circuit, exports audio electrical signal, which is characterized in that
The audio system further includes：
Digital filter, between the voltage input end and audio frequency processing circuit, the digital filter connection electricity
Input terminal is pressed, receive first electric signal and is converted into one first digital signal, the digital filter connects audio frequency process
Circuit is additionally provided with data transmission interface on the digital filter, for being connect with smart machine, is set by smart machine
One Frequency point, the wave filter receive the Frequency point by the data transmission interface, and the wave filter is by described first
Wave band of the digital signal below the Frequency point generates the second digital signal after filtering off and is converted into the second electric signal, is transferred to
The audio frequency processing circuit.
Preferably, the digital filter further includes a feedback module, and the feedback module is connected to the digital filtering
On device, second digital signal is received, is compared according to the wave band of second digital signal with the Frequency point, if institute
The minimum frequency for stating the wave band of the second digital signal is higher than the Frequency point, then feeds back one and reduce elimination instruction to the number filter
Wave device, if the minimum frequency of the wave band of second digital signal is lower than the Frequency point, feedback one, which increases, filters off instruction extremely
The digital filter.
Preferably, the wave filter filters off instruction according to the reduction received, changes the Frequency point, reduces and filters off
The wave band of first digital signal, the wave filter filter off instruction according to the increase received, change the Frequency point,
Increase the wave band for filtering off first digital signal.
Preferably, the smart machine change Frequency point being connect with the digital filter.
Preferably, the smart machine being connect with the digital filter receives described reduce in the feedback module and filters off
When instruction or increase filter off instruction, change reduces elimination or increases the wave band length filtered off.
Preferably, the digital filter includes an analog-digital converter, is connect with the voltage input end, by described first
Electric signal is converted into the first digital signal.
Preferably, the digital filter includes a digital analog converter, is connect with the audio frequency processing circuit, by described the
Two digital signal is converted into the second electric signal.
Preferably, the audio frequency processing circuit receives second electric signal from the wave filter, after being handled
Audio electrical signal is generated, is exported by the voltage output end.
Another aspect of the present invention also provides a kind of audio control method, and voltage input end inputs the first electric signal, is transferred to
Digital filter, the digital filter convert thereof into the first digital signal, are connect according to it by data transmission interface
Smart machine set by frequency algorithm, filter off the wave band of first digital signal below a Frequency point and generate the second number
Word signal is simultaneously converted into the second electric signal, second electric signal is transferred to audio frequency processing circuit, at audio frequency processing circuit
After reason generates audio electrical signal, exported by voltage output end.
Another aspect of the present invention also provides a kind of mobile terminal with the audio system.
After employing above-mentioned technical proposal, compared with prior art, have the advantages that：
1 filters off the low-frequency band for needing to filter off acording to the requirement of user；
2 under the requirement of different sound quality, freely converts low frequency and filters off point；
3. included calibration network.
Description of the drawings
Fig. 1 meets the audio system structure diagram of the preferred embodiment of the present invention.
Reference numeral：1 smart machine；
2 analog-digital converters；
3 digital analog converters；
4 feedback modules；
5 audio frequency processing circuits.
Specific embodiment
The advantages of the present invention is further explained below in conjunction with attached drawing and specific embodiment.
Here exemplary embodiment will be illustrated in detail, example is illustrated in the accompanying drawings.Following description is related to
During attached drawing, unless otherwise indicated, the same numbers in different attached drawings represent the same or similar element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the disclosure.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects be described in detail in claims, the disclosure.
It is only merely for the purpose of description specific embodiment in the term that the disclosure uses, and is not intended to be limiting the disclosure.
" one kind " of singulative used in disclosure and the accompanying claims book, " described " and "the" are also intended to including majority
Form, unless context clearly shows that other meanings.It is also understood that term "and/or" used herein refers to and wraps
Containing one or more associated list items purposes, any or all may be combined.
It will be appreciated that though various information, but this may be described using term first, second, third, etc. in the disclosure
A little information should not necessarily be limited by these terms.These terms are only used for same type of information being distinguished from each other out.For example, not departing from
In the case of disclosure range, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as
One information.Depending on linguistic context, word as used in this " if " can be construed to " ... when " or " when ...
When " or " in response to determining "
In the description of the present invention, it is to be understood that term " longitudinal direction ", " transverse direction ", " on ", " under ", "front", "rear",
The orientation or position relationship of the instructions such as "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer " is based on attached drawing institutes
The orientation or position relationship shown is for only for ease of the description present invention and simplifies description rather than instruction or imply signified dress
It puts or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that limit of the invention
System.
In the description of the present invention, unless otherwise prescribed and limit, it should be noted that term " installation ", " connected ",
" connection " should be interpreted broadly, for example, it may be the connection inside mechanical connection or electrical connection or two elements, it can
To be to be connected directly, can also be indirectly connected by intermediary, it for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term.
In subsequent description, using for representing that the suffix of such as " module ", " component " or " unit " of element is only
Be conducive to the explanation of the present invention, itself there is no specific meanings.Therefore, " module " can mixedly make with " component "
With.
Specifically, refering to Fig. 1, the audio system structure diagram for the preferred embodiment for meeting the present invention for one,
Including voltage input end inputs one first electric signal；
Audio frequency processing circuit 5, connect with voltage input end, receives the signal from voltage input end,
Voltage output end is connect with audio frequency processing circuit 5, exports audio electrical signal, which is characterized in that
The audio system further includes：
Digital filter, between the voltage input end and audio frequency processing circuit 5, the digital filter connection electricity
Input terminal is pressed, receive first electric signal and is converted into one first digital signal, the digital filter connects audio frequency process
Circuit 5 is additionally provided with data transmission interface on the digital filter, for being connect with smart machine 1, by smart machine 1 come
A Frequency point is set, the wave filter receives the Frequency point by the data transmission interface, and the wave filter is by described in
Wave band of first digital signal below the Frequency point generates the second digital signal after filtering off and is converted into the second electric signal, passes
It is handed to the audio frequency processing circuit 5.
More specifically, comparing in fastidious sound system, in order to which basic, normal, high sound loud speaker can fully be sent out
Respective performance is waved, employs frequency dividing circuit and dividing amplifier, makes audio signal of the bass channel by low-frequency range, in this way
There will be no high frequency signals to enter woofer, so that woofer can send out pure bass；Equally, exist
For treble pathways only by the audio signal of high band, there will be no low intermediate frequency signals in this way to enter high pitch loudspeaker, so that
High pitch loudspeaker can send out pure high pitch, be unlikely to not middle low frequency signal and modulated.High-pass filter is just used in frequency dividing
In circuit, high pitched signal is made to enter treble pathways, and low intermediate frequency signal is prevented to enter.Therefore enter audio frequency processing circuit in signal
Before 5, it is necessary first to waveband selection is carried out by a wave filter, suitable wave band is transferred to audio frequency processing circuit 5, and the invention
Targeted is D class audio frequency amplification systems, it is therefore desirable to which the wave band of selection is high frequency band, and then in voltage input end and audio
One high-pass filter is set between processing circuit 5, meanwhile, this is also an important improvement of the present invention, in order to make up existing skill
In art, caused by usually used resistance capacitance high-pass filter, whole low-frequency bands is all filtered off, can not according to
Family needs free debugging to filter off the Frequency point of wave band, selection herein using digital high-pass filter, digital high-pass filter without
Method is directly filtered electric signal, it is therefore desirable to an analog-digital converter 2 be set to be filtered in voltage input end and digital high-pass
Between wave device, analog-digital converter 2 by the electric signal that voltage input end inputs be converted into digital signal for digital high-pass filter at
Reason, in order to ensure that user can be freely according to the needs of itself come the wave band that needs is set to be cut, digital high-pass filter
A data transfer interface is also provided with for being connect with extraneous third party's smart machine 1, the improvement is compared to traditional in sound
5 front end of frequency processing circuit uses resistor ＆ capacitor filter, when needing to change the Frequency point for filtering off wave band, after being calculated
Change resistance value is compared with the mode of capacitance, and fast, convenient, user can be according to pre-set on smart machine 1
Algorithm, change filter off the Frequency point of wave band, digital high-pass filter are transferred to by data transfer interface, in Digital High Pass Filter
Device receive after the piece Frequency point can to by analog-digital converter 2 transmit Lai digital signal be filtered, by the Frequency point
Following frequency filters off, and reaches the requirement of user, this is also the advantage of digital filter, digital signal can by software algorithm Lai
It is filtered, electric signal can not be accomplished, using the improvement of digital filter, while reach user and set elimination according to oneself requirement
The Frequency point of wave band and user, which can freely change, filters off the effect that Frequency point this 2 prior arts of wave band can not accomplish,
Since audio frequency processing circuit 5 can not directly be handled digital signal, a number is set between wave filter and audio frequency processing circuit 5
Mode converter 3, the digital signal after wave filter is filtered is converted into corresponding electric signal, then is transferred to voicefrequency circuit
Processor is exported after being handled by voicefrequency circuit processor by voltage output end again.
Specifically, the digital filter further includes a feedback module 4, and the feedback module 4 is connected to the number filter
On wave device, second digital signal is received, is compared according to the wave band of second digital signal with the Frequency point, if
The minimum frequency of the wave band of second digital signal is higher than the Frequency point, then feeds back one and reduce elimination instruction to the number
Wave filter, if the minimum frequency of the wave band of second digital signal is lower than the Frequency point, feedback one, which increases, filters off instruction
To the digital filter.
More specifically, since the rounding treatment when filtering process to digital signal is carried out in digital high-pass filter holds
Easily there is the accumulation of error, error accumulation will appear parasitic concussion to a certain extent, and the processing at this moment filtered causes for incorrect time
The error of electric signal formed by digital signal conversion, and then the inaccuracy that sound is caused to show, in order to evade such error,
Digital filter further includes a feedback module 4 for reducing error, improves accuracy.The feedback module 4 and digital filter
Connection, specifically 4 one end of feedback module is connected to the rear end of digital filter, for receiving the number letter after being processed
Number, the other end is connected to the front end of digital filter, for feeding back directly to digital filter, make its digital signal also not by
Be corrected during processing, feedback module 4 after the digital signal handled well is received, by the wave band of the digital signal with into
The Frequency point of row filtering is compared, if the minimum frequency of the wave band of digital signal is higher than the Frequency point, feedback module 4
Feedback one, which is reduced, filters off instruction to the digital filter, if described in the minimum frequency ratio of the wave band of second digital signal
Frequency point is low, then feeding back one increases elimination instruction to the digital filter, it is possible thereby to achieve the purpose that correct whole system.
Specifically, the wave filter filters off instruction according to the reduction received, changes the Frequency point, reduces and filters off
The wave band of first digital signal, the wave filter filter off instruction according to the increase received, change the Frequency point,
Increase the wave band for filtering off first digital signal.
More specifically, feedback module 4 is after the digital signal handled well is received, by the wave band of the digital signal
It is compared with the Frequency point being filtered, if the minimum frequency of the wave band of digital signal is higher than the Frequency point, feeds back
The feedback of module 4 one, which is reduced, filters off instruction to the digital filter, and digital filter is after receiving reduction and filtering off instruction, with pre-
If frequency values reduce Frequency point, thus the wave band of elimination is reduced, if the minimum frequency of the wave band of second digital signal
Rate is lower than the Frequency point, then feeding back one increases elimination instruction to the digital filter, and digital filter is receiving increase
After filtering off instruction, increase Frequency point with preset frequency values, thus increase the wave band of elimination, it is possible thereby to which it is entire to reach correction
The purpose of system.By such a feedback mechanism, it is ensured that whole system is operated in the case that expected, finally may be used
To ensure, last digital signal will not be with being set with too large deviation, and then the performance of last sound can reach requirement.
Specifically, the smart machine 1 being connect with the digital filter changes Frequency point.
More specifically, in the prior art, in order into the selection of the wave band of horizontal electrical signal, using resistor ＆ capacitor filter,
If such wave filter will change the required wave band filtered off, need to recalculate resistance value and capacitance, and digital filtering
Device and the superiority of the combination of smart machine 1, which are that, to be selected by software to carry out the elimination of the wave band of digital signal,
Efficient and convenient, in the present embodiment, digital filter is connect by data transmission interface with smart machine 1, and smart machine 1 can be with
The frequency range filtered off required for being changed at any time by software, the convenient user under different situations reply of such setting is for sound
The requirement of effect, while also meet manufacturer when debugging audio, can test effect of the sound under different frequency range, thus reach
To optimum efficiency, the deficiency of indented material is made up, this is also one of benefit caused by the present invention.
Specifically, the smart machine 1 being connect with the digital filter receives described reduce in the feedback module 4 and filters
When going to instruct or increasing elimination instruction, change, which is reduced, filters off or increases the wave band length filtered off.
More specifically, in feedback module 4, the change range for the instruction that feedback module 4 is sent out each time is all identical, this
It has led to when error very little but when the range of feedback command requirement change is larger, number originally can be caused
When the lowest frequency points of signal are lower than the Frequency point of wave band for needing to filter off, in feedback signal to digital filter, number
After wave filter change Frequency point the lowest frequency points of digital signal that generate it is more much higher than the Frequency point of wave band for needing to filter off or
When the lowest frequency points of this digital signal of person are higher than the Frequency point of wave band for needing to filter off, in feedback signal to digital filtering
Device, it is lower than the Frequency point of wave band for needing to filter off that digital filter changes the lowest frequency points of digital signal generated after Frequency point
Very much, lead to the concussion of system in this way, the result that can cause last audio is not fully up to expectations, so reponse system is to system
Correction is to need incremental, is ceaselessly approached to target point rather than has directly surmounted target point, therefore by feedback module
After 4 feed back to the instruction of digital filter, by smart machine 1, it is long that the wave band that reduction filters off or increase filters off can be changed
Degree, in this case, the action of feedback module 4 each time can allow whole system more to stablize, and adjust in this way
When examination, the variation of audio is excessively violent, and when user uses, the performance of audio also can more stablize.
Specifically, the digital filter includes an analog-digital converter 2, is connect with the voltage input end, by described the
One electric signal is converted into the first digital signal.
More specifically, digital high-pass filter can not directly be filtered electric signal, it is therefore desirable to set one
Analog-digital converter 2 is between voltage input end and digital high-pass filter, electric signal that analog-digital converter 2 inputs voltage input end
Digital signal is converted into for digital high-pass filter processing.
Specifically, the digital filter includes a digital analog converter 3, is connect with the audio frequency processing circuit 5, by described in
Second digital signal is converted into the second electric signal.
More specifically, since audio frequency processing circuit 5 can not directly be handled digital signal, in wave filter and audio
One digital analog converter 3 is set between processing circuit 5, and the digital signal after wave filter is filtered is converted into corresponding telecommunications
Number, then voicefrequency circuit processor is transferred to, it is exported again by voltage output end after being handled by voicefrequency circuit processor.
Specifically, the audio frequency processing circuit 5 receives second electric signal from the wave filter, after being handled
Audio electrical signal is generated, is exported by the voltage output end.
More specifically, digital analog converter 3 will treated that digital signal is converted into electronic signal through digital filter
After being converted into electronic signal, which has been to meet the electronic signal of user's needs, and analog-digital converter 2 will as a result,
The electric signal is transferred to audio frequency processing circuit 5, and the electric signal is carried out by audio frequency processing circuit 5 to generate audio after handling accordingly
Electric signal, is used directly for the sound devices such as loud speaker, and sound device is transferred to by voltage output end.
On the other hand, the present invention also provides a kind of audio control method, voltage input end inputs the first electric signal, is transferred to
Digital filter, the digital filter convert thereof into the first digital signal, are connect according to it by data transmission interface
Smart machine 1 set by frequency algorithm, filter off the wave band of first digital signal below a Frequency point and generate second
Digital signal is simultaneously converted into the second electric signal, second electric signal is transferred to audio frequency processing circuit 5, through audio frequency processing circuit
After 5 processing generate audio electrical signal, exported by voltage output end.
On the other hand, the present invention also provides a kind of mobile terminals for including above-mentioned audio system
Mobile terminal can be implemented in a variety of manners.For example, terminal described in the present invention can include such as moving
Phone, smart phone, laptop, PDA (personal digital assistant), PAD (tablet computer), PMP (put by portable multimedia broadcasting
Device), the mobile terminal and such as fixed terminal of number TV, desktop computer etc. of navigation device etc..Hereinafter it is assumed that eventually
End is mobile terminal.However, it will be understood by those skilled in the art that other than being used in particular for the element of mobile purpose, root
The terminal of fixed type is can also apply to according to the construction of embodiments of the present invention.
It should be noted that the embodiment of the present invention has preferable implementation, and not the present invention is made any type of
Limitation, any one skilled in the art change or are modified to possibly also with the technology contents of the disclosure above equivalent effective
Embodiment, as long as without departing from the content of technical solution of the present invention, what technical spirit according to the present invention made above example
Any modification or equivalent variations and modification, in the range of still falling within technical solution of the present invention.
Claims (10)
1. a kind of audio system, including：
Voltage input end inputs one first electric signal；
Audio frequency processing circuit is connect with voltage input end, receives the signal from voltage input end,
Voltage output end is connect with audio frequency processing circuit, exports audio electrical signal, which is characterized in that
The audio system further includes：
Digital filter, between the voltage input end and audio frequency processing circuit, the digital filter connection voltage is defeated
Entering end, receive first electric signal and be converted into one first digital signal, the digital filter connects audio frequency processing circuit,
Data transmission interface is additionally provided on the digital filter, for being connect with smart machine, a frequency is set by smart machine
Rate point, the wave filter receive the Frequency point by the data transmission interface, and the wave filter is digital by described first
Wave band of the signal below the Frequency point generates the second digital signal after filtering off and is converted into the second electric signal, is transferred to described
Audio frequency processing circuit.
2. audio system according to claim 1, which is characterized in that
The digital filter further includes a feedback module, and the feedback module is connected on the digital filter, receives institute
The second digital signal is stated, is compared according to the wave band of second digital signal with the Frequency point, if second number
The minimum frequency of the wave band of signal is higher than the Frequency point, then feeds back one and reduce elimination instruction to the digital filter, if institute
The minimum frequency for stating the wave band of the second digital signal is lower than the Frequency point, then feeding back one increases elimination instruction to the number filter
Wave device.
3. audio system according to claim 2, which is characterized in that
The wave filter filters off instruction according to the reduction received, changes the Frequency point, reduces and filters off first number
The wave band of word signal, the wave filter filter off instruction according to the increase received, change the Frequency point, increase and filter off institute
State the wave band of the first digital signal.
4. audio system according to claim 1, which is characterized in that
The smart machine change Frequency point being connect with the digital filter.
5. audio system according to claim 3, which is characterized in that
The smart machine being connect with the digital filter receives described reduce in the feedback module and filters off instruction or increase filter
When going instruction, change, which is reduced, filters off or increases the wave band length filtered off.
6. audio system according to claim 1, which is characterized in that
The digital filter includes an analog-digital converter, is connect with the voltage input end, and first electric signal is converted
Into the first digital signal.
7. audio system according to claim 1, which is characterized in that
The digital filter includes a digital analog converter, is connect with the audio frequency processing circuit, by second digital signal
It is converted into the second electric signal.
8. audio system according to claim 1, which is characterized in that
The audio frequency processing circuit receives second electric signal from the wave filter, and voiceband telecommunication is generated after being handled
Number, it is exported by the voltage output end.
9. a kind of audio control method, which is characterized in that
Voltage input end inputs the first electric signal, is transferred to digital filter, the digital filter converts thereof into the first number
Word signal according to the frequency algorithm set by the smart machine being connect with it by data transmission interface, filters off first number
Wave band of the word signal below a Frequency point generates the second digital signal and is converted into the second electric signal, by second electric signal
Audio frequency processing circuit is transferred to, after audio frequency processing circuit processing generates audio electrical signal, is exported by voltage output end.
10. a kind of mobile terminal, which is characterized in that the mobile terminal is included according to claim 1-8 any one of them sounds
Display system.
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| CN201711457525.8A CN108174007A (en) | 2017-12-28 | 2017-12-28 | A kind of audio system, audio control method and the mobile terminal with the system |
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| CN201711457525.8A CN108174007A (en) | 2017-12-28 | 2017-12-28 | A kind of audio system, audio control method and the mobile terminal with the system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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