CN209627668U - Virtual bass mould group and audio processing chip - Google Patents
Virtual bass mould group and audio processing chip Download PDFInfo
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Abstract
The utility model embodiment provides virtual bass mould group and audio processing chip.Virtual bass mould group includes: filter, and the filter has filter parameter corresponding with speaker types, for detecting the low frequency fundamental wave；Harmonic oscillator, the harmonic oscillator are used to generate the odd harmonic of the low frequency fundamental wave, and based on the odd harmonic, by the modulation /demodulation of the first high frequency carrier and the second high frequency carrier, generate the even-order harmonic of the low frequency fundamental wave；Higher hamonic wave synthesizer, the higher hamonic wave synthesizer synthesize the odd harmonic and even-order harmonic for modifying, and generate the higher hamonic wave with intact parity frequency multiplication；Virtual bass synthesizer, the virtual bass synthesizer is used for according to preset ratio, in conjunction with the higher hamonic wave and former sound.The odd harmonic and even-order harmonic that mould group can be unified with acquired character occur for the harmonic wave, synthesize itself harmonious higher hamonic wave to provide better virtual bass effect.
Description
Technical field
The utility model relates to Audio Signal Processing technical fields, at a kind of virtual bass mould group and audio
Manage chip.
Background technique
Loudspeaker is a kind of common audio-frequence player device, and the audio signal of input, can under the driving of power amplifier
To realize that electroacoustic is converted, corresponding audio signal is played.
Loudspeaker can measure its equipment performance by multiple indexs.And low-frequency resonance Frequency point be one of them very
Important measurement index, which determine the low frequency lower edge of the frequency response of loudspeaker (that is, the low-frequency resonance Frequency points of loudspeaker
Limit the result of broadcast of low-frequency audio signal).
The low frequency region for the low frequency lower edge of frequency response for being lower than loudspeaker due to excessively using low-frequency gain to increase is not only
Sound quality can be damaged, be also easy so that internal hardware damage occurs in loudspeaker.Therefore, it will usually using corresponding calculation side
Method (such as virtual bass) compensates sound source signal to improve low frequency result of broadcast.
In realizing process of the present invention, it is found by the applicant that the relevant technologies have the following problems: existing virtual bass method
It is that low frequency region is generated to higher hamonic wave, then goes out bass using these higher hamonic wave interpolations for being higher than low-frequency resonance Frequency point
Effect.
During generating higher hamonic wave, a kind of generation method usually can only generate single odd harmonic or idol
Subharmonic.In order to synthesize the higher hamonic wave for obtaining complete frequency multiplication, needs to generate odd harmonic using different methods and even is humorous
It is combined after wave.
The odd harmonic or even-order harmonic generated due to different generation methods has different characteristic (such as harmonic energies
Or harmonic attenuation speed).Therefore, the combination effect of odd harmonic and higher hamonic wave is poor, it is not easy to harmonious.
Summary of the invention
The utility model embodiment is mainly solving the technical problems that avoid in bass simulation process, different generation methods
The odd harmonic of acquisition is different with the characteristic of even-order harmonic, it is difficult to harmonious problem.
In order to solve the above technical problems, the utility model embodiment provides a kind of virtual bass mould group.The virtual bass
Mould group includes:
Filter, the filter has filter parameter corresponding with speaker types, for detecting low frequency fundamental wave；It is humorous
Wave producer, the harmonic oscillator are used to generate the odd harmonic of the low frequency fundamental wave, and using the odd harmonic as base
Plinth generates the even-order harmonic of the low frequency fundamental wave by the modulation /demodulation of the first high frequency carrier and the second high frequency carrier；High order is humorous
Wave synthesizer, the higher hamonic wave synthesizer synthesize the odd harmonic and even-order harmonic for modifying, and generate with complete odd
The higher hamonic wave of even frequency multiplication；Virtual bass synthesizer, the virtual bass synthesizer are used for according to preset ratio, in conjunction with described
Higher hamonic wave and former sound.
In order to solve the above technical problems, the utility model embodiment additionally provides another virtual bass mould group.This is virtual
Bass mould group includes:
Filter, the filter has filter parameter corresponding with speaker types, for detecting low frequency fundamental wave；It is humorous
Wave producer, the harmonic oscillator are used to generate the even-order harmonic of the low frequency fundamental wave, and using the even-order harmonic as base
Plinth generates the odd harmonic of the low frequency fundamental wave by the modulation /demodulation of the first high frequency carrier and the second high frequency carrier；High order is humorous
Wave synthesizer, the higher hamonic wave synthesizer synthesize the odd harmonic and even-order harmonic for modifying, and generate with complete odd
The higher hamonic wave of even frequency multiplication；Virtual bass synthesizer, the virtual bass synthesizer are used for according to preset ratio, in conjunction with described
Higher hamonic wave and former sound.
Optionally, the filter parameter be preset with two groups or more than；Every one group of filter parameter and a kind of loudspeaker
Type is corresponding.
Optionally, the harmonic oscillator includes: harmonics generation unit, modem module and bandpass filter；It is described
Harmonics generation unit is used to generate the odd harmonic or even-order harmonic of the low frequency fundamental wave；
The modem module is used for: by the odd harmonic or even-order harmonic respectively with the first high frequency carrier and
Two high frequency carriers are multiplied, and obtain JieDuHuaYu II Decoction wave；
The bandpass filter is used to filter out non-targeted frequency point in the JieDuHuaYu II Decoction wave, obtain corresponding even-order harmonic or
Person's odd harmonic.
Optionally, when generating odd harmonic with the harmonics generation unit, first high frequency carrier and the low frequency
The difference of fundamental wave is equal to second high frequency carrier；
When generating even-order harmonic with the harmonics generation unit, the sum of first high frequency carrier and the low frequency fundamental wave
Equal to second high frequency carrier.
Optionally, the higher hamonic wave synthesizer includes: balanced device and modification filter；The balanced device is for adjusting institute
State the yield value of odd harmonic and even-order harmonic；The modification filter adjusts the odd harmonic for collocation and even is humorous
Wave.
In order to solve the above technical problems, the utility model embodiment additionally provides a kind of audio processing chip.The audio
Processing chip includes: decoding mould group, and the decoding mould group is for decoding the audio signal received；Filter, the filter
With filter parameter corresponding with speaker types, for detecting the low frequency fundamental wave from the audio signal；Harmonic wave hair
Raw device, the harmonic oscillator are used to generate the odd harmonic of the low frequency fundamental wave, and based on the odd harmonic, lead to
The modulation /demodulation for crossing the first high frequency carrier and the second high frequency carrier generates the even-order harmonic of the low frequency fundamental wave；Described first is high
The difference of frequency carrier wave and the low frequency fundamental wave is equal to second high frequency carrier；Higher hamonic wave synthesizer, the higher hamonic wave synthesis
Device synthesizes the odd harmonic and even-order harmonic for modifying, and generates the higher hamonic wave with intact parity frequency multiplication；Virtual bass
Synthesizer, the virtual bass synthesizer is used for according to preset ratio, in conjunction with the higher hamonic wave and former sound, in the sound
Corresponding virtual bass is added in frequency signal；And power amplifier, the power amplifier is for amplifying the virtual bass
The signal power of the audio signal of synthesizer output, to provide the signal power for meeting loudspeaker requirements.
In order to solve the above technical problems, the utility model embodiment additionally provides another audio processing chip.The sound
Frequency handles chip
Mould group is decoded, the decoding mould group is for decoding the audio signal received；
Filter, the filter have filter parameter corresponding with speaker types, are used for from the audio signal
The middle detection low frequency fundamental wave；
Harmonic oscillator, the harmonic oscillator are used to generate the even-order harmonic of the low frequency fundamental wave, and with the idol
Based on subharmonic, by the modulation /demodulation of the first high frequency carrier and the second high frequency carrier, the odd times of the low frequency fundamental wave are generated
Harmonic wave；The sum of first high frequency carrier and the low frequency fundamental wave are equal to second high frequency carrier；
Higher hamonic wave synthesizer, the higher hamonic wave synthesizer synthesize the odd harmonic and even-order harmonic for modifying,
Generate the higher hamonic wave with intact parity frequency multiplication；
Virtual bass synthesizer, the virtual bass synthesizer are used for according to preset ratio, in conjunction with the higher hamonic wave
With former sound, to add corresponding virtual bass in the audio signal；
Power amplifier, the power amplifier are used to amplify the letter of the audio signal of the virtual bass synthesizer output
Number power is provided to loudspeaker broadcasting.
Optionally, the filter parameter is provided with two groups or more；The filter parameter that the filter is selected by with
The low frequency region of the loudspeaker of the power amplifier connection determines.
Optionally, the audio signal is digital audio and video signals；The audio processing chip further include: digital analog converter；
The digital analog converter is connect with the virtual bass synthesizer and the power amplifier respectively, is used for the virtual bass
The digital audio and video signals of synthesizer output are converted to analog audio signal.
The virtual bass mould group provided in the utility model embodiment with the methods of non-linear odd harmonic produced or
Based on person's even-order harmonic, corresponding even-order harmonic or odd harmonic are produced using principles of modulation and demodulation.It is achieved in that
Odd harmonic and even-order harmonic characteristic are unified, can obtain itself harmonious higher hamonic wave to provide preferably virtual bass effect
Fruit.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is application environment schematic diagram provided by the embodiment of the utility model；
Fig. 2 is the structural schematic diagram of audio processing chip provided by the embodiment of the utility model；
Fig. 3 is the connection timing diagram of virtual bass mould group provided by the embodiment of the utility model；
Fig. 4 is the structural schematic diagram of harmonic oscillator provided by the embodiment of the utility model；
Fig. 5 is the method flow diagram of virtual bass generation method provided by the embodiment of the utility model；
Fig. 6 is the method flow diagram for the virtual bass generation method that another embodiment of the utility model provides.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only to explain this
Utility model is not used to limit the utility model.
The low-frequency resonance Frequency point (also known as resonant frequency or resonance frequency) of loudspeaker is on the impedance curve of loudspeaker, low
The impedance maximum value that frequency range occurs.Which determine the frequency response range lower edges of loudspeaker.It is lower than low frequency in audio signal
The region of resonant frequency point is the low frequency region that loudspeaker can not play.
In order to compensate the bass result of broadcast of low frequency region, mode usually is remedied using calculations such as virtual basses,
The result of broadcast of low frequency is simulated in the form of being higher than the higher hamonic wave interpolation of low-frequency resonance Frequency point.
Fig. 1 is the application environment of virtual bass provided by the embodiment of the utility model.As shown in Figure 1, the application environment packet
Include audiogenic device 10, audio processing chip 20 and loudspeaker 30.
The audiogenic device 10 be it is any kind of, for providing the intelligent or non intelligent hardware of audio signal to be played
Equipment, including mobile phone, computer, tablet computer, USB flash disk, MP3 player etc..It has at least one output port, to export
The audio signal that can not identified.
In some embodiments, which can have operation or control system, receives user instructions and adjusts
With corresponding digital audio and video signals, exported from one or more output port.
The audio processing chip 20 is connect with the audiogenic device 10, for being adjusted or repairing to audio signal
The electronic circuit component of decorations.The audio processing chip 20 can be made of one or more functional module group interconnected, with
Realize corresponding modification effect.
For example, as shown in Fig. 2, the audio processing chip 20 may include for decoded decoding mould group 21, in sound
Added in frequency signal corresponding virtual bass audio virtual bass mould group 22 and for amplify audio signal so that output
Signal power can meet the power amplifier 23 of speaker drive requirement.
Wherein, which can receive the original audio signal from audiogenic device 10 and is decoded to it.
The audio signal for being located at low frequency region can be generated corresponding higher hamonic wave to compensate loudspeaker by the virtual bass mould group 22
Bass effect.Power amplifier 23 is placed in last position, and the audio signal after adjustment modification is amplified to provide
Enough signal power drive the speakers play sound.
Certainly, the audio processing chip 20 can also select to add other different audio mould groups according to actual needs
(such as active noise reduction mould group) and be not limited to virtual bass mould group.
In some embodiments, when audiogenic device 10 provides digital audio and video signals.As shown in Fig. 2, the audio
Processing chip 20 can also be provided with analog-digital converter 24 accordingly, realize digital audio and video signals and mould by analog-digital converter 24
Conversion between quasi- audio signal.
Audio processing chip 20 can realize with any suitable electronic computing platform, such as can be with audio processing chip
Form realize.The audio processing chip 20 can be integrated into audiogenic device 10 or loudspeaker 30 according to actual needs, be made
For one of hardware function units.In further embodiments, the audio processing chip 20 can also be one individually
Component is arranged independently of audiogenic device 10 or loudspeaker 30.
Loudspeaker 30 can be any kind of electro-acoustic conversion device (such as moving-coil type loudspeaker, moving-iron type loudspeaker, earphone or
Stero set etc.), it is the final terminal device for generating sound.It is connect by audio processing chip 20 with audiogenic device 10,
It plays by treated the audio data of audio processing chip 20.
Different types of loudspeaker can have a different equipment performances, and bass effect that loudspeaker can play etc. is also
Difference, for example, different loudspeakers can have different low-frequency resonance Frequency points.
There is the physical transfer of transmission data and instruction between audiogenic device 10, audio processing chip 20 and loudspeaker 30
Channel.The used physical transmission channel based on the data that radio frequency network (such as bluetooth, WiFi or infrared) establishes either passed
Defeated channel is also possible to connect the data transmission channel to be formed (such as USB connection or I2C bus) by wireline equipment.It is based on
The used physical transmission channel handles or untreated audio signal can in any other suitable format or communication protocol is passed
It is defeated.
Usual higher hamonic wave producing method needs to generate odd harmonic and even respectively using two different methods
Harmonic wave is easy to cause fiting effect bad because characteristic between the two is different, it is not easy to harmonious.Implement using the utility model
The virtual bass mould group that example provides, odd harmonic and even-order harmonic can be generated under Same Way, it is humorous to help to obtain itself
The higher hamonic wave of sum promotes the effect of virtual bass.
Fig. 3 is the structural schematic diagram of virtual bass mould group 22 provided by the embodiment of the utility model.As shown in figure 3, the void
Quasi- bass mould group may include: filter 31, harmonic oscillator 32, higher hamonic wave synthesizer 33 and virtual bass synthesizer
34。
Wherein, the filter 31 is located at the input terminal of virtual bass mould group.Due to the loudspeaking of different type or model
Device has different low-frequency resonance frequencies, can not predict in advance in chip design process in advance.Therefore, it applies for convenience,
For common speaker types, the different filter parameter of multiple groups can be previously provided with.Every one group of filter parameter is all divided
It is not adapted with the speaker types with different resonant frequencies.
When in use, corresponding one group of filter parameter can be selected according to the loudspeaker 30 of actual use, thus logical
Wave filter 31 obtains the low frequency fundamental wave for being in low frequency region.
The low frequency fundamental wave refers to the audio signal in speakers low frequencies region.These audio signals are in the frequency of loudspeaker
The low frequency lower edge of rate response can be provided to subsequent functional module and carry out the audio enhancing operation of virtual bass to improve loudspeaking
The low frequency result of broadcast of device.
The harmonic oscillator 32 is used to generate the odd harmonic of the low frequency fundamental wave, and using the odd harmonic as base
Plinth generates the even-order harmonic of the low frequency fundamental wave by the modulation /demodulation of the first high frequency carrier and the second high frequency carrier.
The harmonic oscillator 32 can generate the surprise of low frequency fundamental wave using existing any kind of algorithm or calculation mode
Subharmonic (such as nonlinear way).The odd harmonic refers to that frequency is the harmonic wave of the frequency odd-multiple of low frequency fundamental wave.At this
In embodiment, with fm, 3fm ... ..., nfm expression, n is odd number, and fm is low frequency fundamental wave.
Harmonic oscillator 32 also further utilizes principles of modulation and demodulation after generating odd harmonic, special by meeting
The first high frequency carrier and the second high frequency carrier for determining frequency condition requirement generate corresponding even-order harmonic.
Higher hamonic wave synthesizer 33 is connect with harmonic oscillator 32, can modify the odd times that synthesis harmonic oscillator 32 exports
Harmonic wave and even-order harmonic (such as simple gain and filtering adjustment collocation) synthesize that itself is harmonious thus whole, have complete
The higher hamonic wave of odd even frequency multiplication.Modification synthesis can specifically be carried out according to the actual situation using corresponding mode, such as filtering or
Person's EQ gain process etc..
Specifically, the higher hamonic wave synthesizer 33 may include balanced device and modification filter.Wherein, the balanced device
For adjusting the yield value of the odd harmonic and even-order harmonic.The modification filter is then used to arrange in pairs or groups, and to adjust the odd times humorous
Wave and even-order harmonic.
It is, of course, also possible to which demand according to the actual situation, increases or adjusts the higher hamonic wave synthesizer 33 specifically packet
The functional module contained, is adjusted correspondingly odd harmonic and even-order harmonic.
After obtaining the higher hamonic wave with complete frequency multiplication by higher hamonic wave synthesizer 33, finally by the virtual bass
The higher hamonic wave in conjunction with former sound, is realized the bass compensation effect of virtual bass by synthesizer 34.
Wherein, the virtual bass synthesizer 34 can according to preset ratio, by with complete frequency multiplication higher hamonic wave with
Former sound is combined, and is output into subsequent functional module.The preset ratio is empirical value, can be according to practical feelings
Condition needs to be arranged.
The original sound refers to the initial audio data of audiogenic device output.The processing Jing Guo above-mentioned virtual bass mould group with
Afterwards, bass audio can be increased in the low frequency region of former sound.
Although only describing virtual bass when harmonic oscillator 32 generates odd harmonic in the utility model embodiment
Implementation method.But it will be appreciated by persons skilled in the art that the harmonic oscillator 32 can also generate even-order harmonic, and
Based on even-order harmonic, it is humorous that odd times are obtained using corresponding method (utilizing the first high frequency carrier and the second high frequency carrier)
Wave.
Below in conjunction with specific example, the specific mistake that above-mentioned harmonic oscillator generates odd harmonic and even-order harmonic is described in detail
Journey.As shown in figure 4, the harmonic oscillator 32 includes: harmonics generation unit 321, modem module 322 and bandpass filter
323。
In some embodiments, the harmonics generation unit 321 generates the surprise of low frequency fundamental wave by the way of non-linear wait
Subharmonic fm, 3fm... ..., nfm(n is odd number).Then, the odd harmonic is carried multiplied by the first high frequency by modem module
Wave, and be multiplied in demodulation with second high frequency carrier, obtain JieDuHuaYu II Decoction wave.
Wherein, the first high frequency carrier f1With the second high frequency carrier f2Between meet the first high frequency carrier f1With low frequency fundamental wave fm
Difference be equal to the second high frequency carrier f2Condition, that is, f1-fm=f2。
With fundamental frequency fmFor, by its respectively with the first high frequency carrier f1With the second high frequency carrier f2Obtained result be multiplied such as
Shown in formula (1):
cos(f1*t)*cos(fm*t)*cos(f2*t) (1)
It can be obtained after being converted to formula (1):
1/4{cos((f1+f2+fm)t)+cos((f1-f2+fm)t)+cos((f1+f2-fm)t)+ cos((f1-f2-fm)t)}
Due to f1-fm=f2.Therefore, four frequency points after the demodulation of the second high frequency carrier are respectively as follows: 1/4 (2f1)、1/
4(2fm)、1/4(2f1-2fm) and 1/4 (0).
In the case where the frequency of the first high frequency carrier and the second high frequency carrier is much higher than low frequency fundamental wave (that is, f1>>fm),
Frequency difference in four above-mentioned frequency points between unwanted non-targeted frequency point and required target frequency point is very big.
Therefore, unwanted non-targeted frequency point very can be filtered out simply by bandpass filter, thus 2f required for obtainingm。
Analogously, if with frequency tripling 3fmRespectively with the first high frequency carrier f1With the second high frequency carrier f2It, can after being multiplied to
To obtain the result as shown in formula (3):
cos(f1*t)*cos(fm*t)*cos(f2*t) (2)
It can be obtained after being converted to formula (2):
1/4{cos((f1+f2+3fm)t)+cos((f1-f2+3fm)t)+cos((f1+f2-3fm)t) +cos((f1-f2-
3fm)t)}
Similarly, according to f1-fm=f2, following four frequency points: 1/4 (2f may finally be obtained1+2fm)、 1/4(4fm)、1/
4(2f1-4fm) and 1/4 (- 2fm)。
In f1>>3fmUnder the premise of, ignore negative frequency and similarly can be readily by non-targeted frequency point by bandpass filter
It filters out, 4f required for obtainingm。
In further embodiments, the harmonics generation unit 321 generates low frequency then by the way of non-linear wait first
The even-order harmonic 2f of fundamental wavem, 4fm... ..., nfm(n is even number).Then, by modem module by the even-order harmonic multiplied by
One high frequency carrier, and be multiplied in demodulation with second high frequency carrier, obtain JieDuHuaYu II Decoction wave.
Wherein, the first high frequency carrier f1With the second high frequency carrier f2Between meet the first high frequency carrier f1With low frequency fundamental wave fm
The sum of be equal to the second high frequency carrier f2Condition, that is, f1+fm=f2。
With two frequency multiplication 2fmFor, by its respectively with the first high frequency carrier f1With the second high frequency carrier f2Be multiplied obtained result
As shown in formula (3):
cos(f1*t)*cos(2fm*t)*cos(f2*t) (3)
It can be obtained after being converted to formula (3):
1/4{cos((f1+f2+2fm)t)+cos((f1-f2+2fm)t)+cos((f1+f2-2fm)t) +cos((f1-f2-
2fm)t)}
Due to f1+fm=f2.Therefore, finally obtained four frequency points specifically: 1/4 (2f1+3fm)、 1/4(fm)、1/4
(2f1-fm) and 1/4 (- 3fm)。
In the case where the frequency of the first high frequency carrier and the second high frequency carrier is much higher than low frequency fundamental wave (that is, f1>>
2fm), the frequency difference right and wrong between target frequency point that unwanted non-targeted frequency point and expectation obtain in four above-mentioned frequency points
It is often big.Therefore, negative frequency can be ignored and filter out unwanted non-targeted frequency point simply by bandpass filter, needed for acquisition
Want fm。
Analogously, if with quadruple 4fmRespectively with the first high frequency carrier f1With the second high frequency carrier f2It, can after being multiplied to
To obtain the result as shown in formula (4):
cos(f1*t)*cos(4fm*t)*cos(f2*t) (4)
It can be obtained after being converted to formula (4):
1/4{cos((f1+f2+4fm)t)+cos((f1-f2+4fm)t)+cos((f1+f2-4fm)t) +cos((f1-f2-
4fm)t)}
Similarly, according to f1+fm=f2, following four frequency points: 1/4 (2f may finally be obtained1+5fm)、 1/4(3fm)、1/
4(2f1-3fm) and 1/4 (- 5fm)。
In f1>>4fmUnder the premise of, ignore negative frequency and similarly can be readily by non-targeted frequency point by bandpass filter
It filters out, odd number frequency multiplication 3f required for obtainingm。
Based on provided by the embodiment of the utility model about fm、2fm、3fmAnd 4fmSpecific processing example, art technology
Personnel, which are readily apparent that, can be generalized to other nf based on identical principle or invention thinkingmIn, with odd number frequency multiplication or even number
Based on frequency multiplication, even number frequency multiplication required for obtaining or odd number frequency multiplication, such as with 5fmBased on, pass through the first high frequency carrier
With the second high frequency carrier, 6f is obtainedm。
Although should be noted that in the utility model embodiment only in a manner of functional name to above-mentioned audio at
Hardware circuit module in reason chip is described.But those skilled in the art can take off according to the utility model embodiment
The function of executing required for the hardware circuit module of dew selects existing any suitable electronic component or device to realize.This
The mode of a little electronic components and device composition corresponding function circuit is well known to the skilled person, and therefore not to repeat here.
Each functional module specifically can be by reality in such a way that the cooperation of software realization, hardware realization or software and hardware is realized
The requirement of border application is determined.Such as in the case where chip cost requires more stringent, it can be cooperated using software and hardware
The mode of realization, to reduce required chip circuit area and increase flexibility.
In some embodiments, said one or multiple functional modules can be used as discrete element and be respectively set.In
In other embodiments, two or above functional module can also be integrated on the same hardware circuit or circuit chip
It realizes.
The hardware function of the audio processing chip disclosed based on the above embodiment.The utility model embodiment also provides
A kind of corresponding virtual bass generation method.Based on the virtual bass generation method, itself harmonious high order can be obtained
Harmonic wave provides better bass effect.
Fig. 5 is the generation method of virtual bass provided by the embodiment of the utility model.As shown in figure 5, the virtual bass is raw
It may include steps of at method:
510, the odd harmonic of low frequency fundamental wave is generated.
The odd harmonic refers to that frequency is the harmonic wave of the low frequency fundamental wave odd-multiple.In the present embodiment, with fm、3fm、
5fm... it indicates.fmFor the base frequency.Required odd harmonic, example can be specifically generated using any suitable way
It is simply generated in this way with nonlinear way.
520, it based on the odd harmonic, by the modulation /demodulation of the first high frequency carrier and the second high frequency carrier, produces
The even-order harmonic of the raw low frequency fundamental wave.
Wherein, the first high frequency carrier and the second high frequency carrier should meet such requirement: first high frequency carrier with
The difference of the low frequency fundamental wave is equal to second high frequency carrier.
Using the principle of modulation /demodulation, can produce include even-order harmonic ingredient result.It is filtered by simple band logical
The mode of wave etc., carrying out simple and quick separation to the result of demodulation can be obtained desired even-order harmonic.
530, the odd harmonic and even-order harmonic are synthesized, the higher hamonic wave with intact parity frequency multiplication is obtained.
Due to even-order harmonic and odd harmonic be all based on that identical method obtains (even-order harmonic is converted by odd harmonic
And obtain).Therefore, characteristic having the same between the two, can be readily available itself harmonious higher hamonic wave.
540, according to preset ratio, in conjunction with the higher hamonic wave and former sound.
After obtaining the higher hamonic wave with intact parity frequency multiplication, it can be mentioned in conjunction with initial audio data
It supplies loudspeaker to play, so that the bass effect of loudspeaker gets a promotion.
The original sound refers to by audiogenic device offer, without the initial audio data of audio effect processing.The preset ratio
Example is an empirical value, can be arranged according to the needs of actual conditions by those skilled in the art.
Specifically, the step 520 can be achieved by the steps of: firstly, according to modulation principle, the odd times are humorous
Wave is multiplied with the first high frequency carrier.Then, it in demodulation, is multiplied with the second high frequency carrier, obtains JieDuHuaYu II Decoction wave.
Finally, filtering out the non-targeted frequency point of the JieDuHuaYu II Decoction wave, the even-order harmonic of the low frequency fundamental wave is generated.
Non-targeted frequency point is the JieDuHuaYu II Decoction wave after being modulated demodulation using the first high frequency carrier and the second high frequency carrier
In include some unwanted frequency points.
It is preferred that when the first high frequency carrier and the second high frequency carrier use hyperfrequency carrier signal, in demodulation result
Frequency difference between non-targeted frequency point and required target frequency point is by highly significant.Thus, it is possible to be convenient to use band logical
The mode of filtering sorts out target frequency point from demodulation result.
The hyperfrequency carrier signal is a relativity concept, for indicating the first high frequency carrier and the second high frequency carrier
Frequency difference between low frequency fundamental wave is very big, e.g. the 100 of low frequency fundamental frequency times or 1000 times etc..First high frequency
Frequency difference is bigger between carrier wave and the second high frequency carrier and low frequency fundamental wave, and non-targeted frequency point easier will be sorted out.This field skill
Art personnel can select the first high frequency carrier and the second high frequency carrier that use suitable frequency according to the needs of actual conditions.
In further embodiments, it can also be completed based on the even-order harmonic of low frequency fundamental wave above-mentioned identical virtual low
Sound realizes process, obtains itself harmonious higher hamonic wave.Fig. 6 is the life for the virtual bass that another embodiment of the utility model provides
At method.As shown in fig. 6, the virtual bass generation method may include steps of:
610, the even-order harmonic of low frequency fundamental wave is generated.
The even-order harmonic refers to that frequency is the harmonic wave of the low frequency fundamental wave even-multiple.In the present embodiment, with 2fm、4fm、
6fm... it indicates.fmFor the base frequency.Required even-order harmonic, example can be specifically generated using any suitable way
It is simply generated in this way with the way of nonlinear load.
620, according to modulation principle, the even-order harmonic is multiplied with the first high frequency carrier, and in demodulation, with second
High frequency carrier is multiplied, and obtains JieDuHuaYu II Decoction wave.
Wherein, the first high frequency carrier and the second high frequency carrier need to meet following condition: first high frequency carrier with
The sum of described low frequency fundamental wave is equal to second high frequency carrier.
630, the non-targeted frequency point for filtering out the JieDuHuaYu II Decoction wave generates the odd harmonic of the low frequency fundamental wave.In modulatedemodulate
After the completion of tune, the mode using bandpass filtering can choose, unwanted ingredient is filtered out to obtain desired odd harmonic.
640, the odd harmonic and even-order harmonic are synthesized, the higher hamonic wave with intact parity frequency multiplication is obtained.
Identical with embodiment shown in fig. 5 to be, the above method obtains odd harmonic and even-order harmonic is all by same
Kind method generates, characteristic having the same, therefore is easy to produce itself harmonious higher hamonic wave.
650, according to preset ratio, in conjunction with the higher hamonic wave and former sound.
Former sound after in conjunction with higher hamonic wave is the effect for realizing virtual bass.It original place can be in the part of low frequency region
It is simulated in a manner of higher hamonic wave interpolation, when being played by loudspeaker, can have preferable bass perception.
Professional should further appreciate that, described in conjunction with the examples disclosed in this document illustrative
The realization step of virtual bass, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly say
The interchangeability of bright hardware and software generally describes each exemplary composition and step according to function in the above description
Suddenly.These functions are implemented in hardware or software actually, the specific application and design constraint item depending on technical solution
Part.
Professional technician can use different methods to achieve the described function each specific application, still
It is this to realize it is not considered that exceeding the scope of the utility model.The computer software can be stored in computer-readable storage
In medium, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can
For magnetic disk, CD, read-only memory or random access memory etc..
The foregoing is merely the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
It is equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, directly or indirectly uses
In other related technical areas, it is also included in the patent protection scope of the utility model.
Claims (10)
1. a kind of virtual bass mould group characterized by comprising
Filter, the filter has filter parameter corresponding with speaker types, for detecting low frequency fundamental wave；
Harmonic oscillator, the harmonic oscillator are used to generate the odd harmonic of the low frequency fundamental wave, and humorous with the odd times
Based on wave, by the modulation /demodulation of the first high frequency carrier and the second high frequency carrier, the even-order harmonic of the low frequency fundamental wave is generated；
Higher hamonic wave synthesizer, the higher hamonic wave synthesizer synthesize the odd harmonic and even-order harmonic for modifying, and generate
Higher hamonic wave with intact parity frequency multiplication；
Virtual bass synthesizer, the virtual bass synthesizer is used for according to preset ratio, in conjunction with the higher hamonic wave and original
Sound.
2. a kind of virtual bass mould group characterized by comprising
Filter, the filter has filter parameter corresponding with speaker types, for detecting low frequency fundamental wave；
Harmonic oscillator, the harmonic oscillator are used to generate the even-order harmonic of the low frequency fundamental wave, and humorous with the even
Based on wave, by the modulation /demodulation of the first high frequency carrier and the second high frequency carrier, the odd harmonic of the low frequency fundamental wave is generated；
Higher hamonic wave synthesizer, the higher hamonic wave synthesizer synthesize the odd harmonic and even-order harmonic for modifying, and generate
Higher hamonic wave with intact parity frequency multiplication；
Virtual bass synthesizer, the virtual bass synthesizer is used for according to preset ratio, in conjunction with the higher hamonic wave and original
Sound.
3. virtual bass mould group according to claim 1 or 2, which is characterized in that the filter parameter is preset with two groups
More than or；Every one group of filter parameter is corresponding with a kind of speaker types.
4. virtual bass mould group according to claim 1 or 2, which is characterized in that the harmonic oscillator includes: harmonic wave hair
Raw unit, modem module and bandpass filter；
The harmonics generation unit is used to generate the odd harmonic or even-order harmonic of the low frequency fundamental wave；
The modem module is used for: the odd harmonic or even-order harmonic is high with the first high frequency carrier and second respectively
Frequency carrier multiplication obtains JieDuHuaYu II Decoction wave；
The bandpass filter is used to filter out the non-targeted frequency point in the JieDuHuaYu II Decoction wave, obtains corresponding even-order harmonic or surprise
Subharmonic.
5. virtual bass mould group according to claim 4, which is characterized in that
When generating odd harmonic with the harmonics generation unit, the difference of first high frequency carrier and the low frequency fundamental wave is equal to
Second high frequency carrier；
When generating even-order harmonic with the harmonics generation unit, the sum of first high frequency carrier and the low frequency fundamental wave are equal to
Second high frequency carrier.
6. virtual bass mould group according to claim 1 or 2, which is characterized in that the higher hamonic wave synthesizer includes: equal
Weighing apparatus and modification filter；
The balanced device is used to adjust the yield value of the odd harmonic and even-order harmonic；
The modification filter adjusts the odd harmonic and even-order harmonic for arranging in pairs or groups.
7. a kind of audio processing chip characterized by comprising
Mould group is decoded, the decoding mould group is for decoding the audio signal received；
Filter, the filter has filter parameter corresponding with speaker types, for examining from the audio signal
Low frequency fundamental wave out；
Harmonic oscillator, the harmonic oscillator are used to generate the odd harmonic of the low frequency fundamental wave, and humorous with the odd times
Based on wave, by the modulation /demodulation of the first high frequency carrier and the second high frequency carrier, the even-order harmonic of the low frequency fundamental wave is generated；
The difference of first high frequency carrier and the low frequency fundamental wave is equal to second high frequency carrier；
Higher hamonic wave synthesizer, the higher hamonic wave synthesizer synthesize the odd harmonic and even-order harmonic for modifying, and generate
Higher hamonic wave with intact parity frequency multiplication；
Virtual bass synthesizer, the virtual bass synthesizer is used for according to preset ratio, in conjunction with the higher hamonic wave and original
Sound, to add corresponding virtual bass in the audio signal；
Power amplifier, the power amplifier are used to amplify the signal function of the audio signal of the virtual bass synthesizer output
Rate, output to loudspeaker play.
8. a kind of audio processing chip characterized by comprising
Mould group is decoded, the decoding mould group is for decoding the audio signal received；
Filter, the filter has filter parameter corresponding with speaker types, for examining from the audio signal
Low frequency fundamental wave out；
Harmonic oscillator, the harmonic oscillator are used to generate the even-order harmonic of the low frequency fundamental wave, and humorous with the even
Based on wave, by the modulation /demodulation of the first high frequency carrier and the second high frequency carrier, the odd harmonic of the low frequency fundamental wave is generated；
The sum of first high frequency carrier and the low frequency fundamental wave are equal to second high frequency carrier；
Higher hamonic wave synthesizer, the higher hamonic wave synthesizer synthesize the odd harmonic and even-order harmonic for modifying, and generate
Higher hamonic wave with intact parity frequency multiplication；
Virtual bass synthesizer, the virtual bass synthesizer is used for according to preset ratio, in conjunction with the higher hamonic wave and original
Sound, to add corresponding virtual bass in the audio signal；
Power amplifier, the power amplifier are used to amplify the signal function of the audio signal of the virtual bass synthesizer output
Rate, output to loudspeaker play.
9. audio processing chip according to claim 7 or 8, which is characterized in that the filter parameter is provided with two groups
Or more；The filter parameter that the filter is selected is determined by the low frequency region for the loudspeaker connecting with the power amplifier
It is fixed.
10. audio processing chip according to claim 7 or 8, which is characterized in that the audio signal is digital audio letter
Number；
The audio processing chip further include: digital analog converter；The digital analog converter respectively with the virtual bass synthesizer
It is connected with the power amplifier, for the digital audio and video signals of the virtual bass synthesizer output to be converted to analogue audio frequency
Signal.
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| CN109068233A (en) * | 2018-10-12 | 2018-12-21 | 建荣半导体（深圳）有限公司 | Virtual bass generation method, virtual bass mould group and audio processing chip |
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| CN109068233A (en) * | 2018-10-12 | 2018-12-21 | 建荣半导体（深圳）有限公司 | Virtual bass generation method, virtual bass mould group and audio processing chip |
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