CN109068233A - Virtual bass generation method, virtual bass mould group and audio processing chip - Google Patents
Virtual bass generation method, virtual bass mould group and audio processing chip Download PDFInfo
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- CN109068233A CN109068233A CN201811191130.2A CN201811191130A CN109068233A CN 109068233 A CN109068233 A CN 109068233A CN 201811191130 A CN201811191130 A CN 201811191130A CN 109068233 A CN109068233 A CN 109068233A
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2803—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means for loudspeaker transducers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
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- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The embodiment of the present invention provides virtual bass generation method, virtual bass mould group and audio processing chip.The virtual bass generation method includes: to generate the odd harmonic of low frequency fundamental wave；Based on the odd harmonic, 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；Or generate the even-order harmonic of low frequency fundamental wave；Based on the even-order harmonic, 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.Finally, synthesizing the odd harmonic and even-order harmonic, acquisition has the higher hamonic wave of intact parity frequency multiplication and according to preset ratio, in conjunction with the higher hamonic wave and former sound.This method can be unified with acquired character odd harmonic and even-order harmonic, synthesize itself harmonious higher hamonic wave to provide better virtual bass effect.
Description
Technical field
The present invention relates to Audio Signal Processing technical field, more particularly to a kind of virtual bass generation method, virtual low
Sound mould group and audio processing chip.
Background technique
Loudspeaker is a kind of common audio-frequence player device, under the driving of power amplifier, electroacoustic may be implemented and turn
It changes, plays corresponding audio signal.
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 have different characteristic (such as harmonic energy or
Person's 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 embodiment of the present invention is mainly solving the technical problems that the odd harmonic and even-order harmonic that different generation methods obtain
Characteristic it is different, it is difficult to it is harmonious.
In order to solve the above technical problems, the embodiment of the invention provides a kind of virtual bass generation methods.It is described virtual low
Sound generation method includes:
Generate the odd harmonic of low frequency fundamental wave；It is high by the first high frequency carrier and second based on the odd harmonic
The modulation /demodulation of frequency carrier wave generates the even-order harmonic of the low frequency fundamental wave；First high frequency carrier and the low frequency fundamental wave it
Difference is equal to second high frequency carrier；The odd harmonic and even-order harmonic are synthesized, the high order with intact parity frequency multiplication is obtained
Harmonic wave；According to preset ratio, in conjunction with the higher hamonic wave and former sound.
Optionally, 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, comprising:
According to modulation principle, the odd harmonic is multiplied with the first high frequency carrier, and in demodulation, with the second high frequency
Carrier multiplication obtains JieDuHuaYu II Decoction wave；
The non-targeted frequency point for filtering out the JieDuHuaYu II Decoction wave generates the even-order harmonic of the low frequency fundamental wave.
In order to solve the above technical problems, the embodiment of the invention also provides another virtual bass generation methods.The void
Intending bass generation method includes:
Generate the even-order harmonic of low frequency fundamental wave；It is high by the first high frequency carrier and second based on the even-order harmonic
The modulation /demodulation of frequency carrier wave generates the odd harmonic of the low frequency fundamental wave；First high frequency carrier and the low frequency fundamental wave it
Be equal to second high frequency carrier；The odd harmonic and even-order harmonic are synthesized, the high order with intact parity frequency multiplication is obtained
Harmonic wave；According to preset ratio, in conjunction with the higher hamonic wave and former sound.
Optionally, based on the even-order harmonic, by the modulation /demodulation of the first high frequency carrier and the second high frequency carrier,
Generate the odd harmonic of the low frequency fundamental wave, comprising:
According to modulation principle, the even-order harmonic is multiplied with the first high frequency carrier, and in demodulation, with the second high frequency
Carrier multiplication obtains JieDuHuaYu II Decoction wave；
The non-targeted frequency point for filtering out the JieDuHuaYu II Decoction wave generates the odd harmonic of the low frequency fundamental wave.
Optionally, first high frequency carrier and the second high frequency carrier are the superelevation relative to odd harmonic or even-order harmonic
Frequency carrier signal.
In order to solve the above-mentioned technical problem, the embodiment of the invention also provides a kind of virtual bass mould groups.The virtual bass
Mould group includes: harmonic oscillator, and the harmonic oscillator is used to generate the odd harmonic of 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 have for modifying the synthesis odd harmonic and even-order harmonic, generation
The higher hamonic wave of intact parity frequency multiplication；Virtual bass synthesizer, the virtual bass synthesizer is by the higher hamonic wave and former sound
In conjunction with.
In order to solve the above-mentioned technical problem, the embodiment of the invention also provides a kind of virtual bass mould groups.It is described virtual low
Sound mould group includes: harmonic oscillator, and the harmonic oscillator is used to generate the even-order harmonic of low frequency fundamental wave, and with the even
Based on harmonic wave, by the modulation /demodulation of the first high frequency carrier and the second high frequency carrier, the odd times for generating the low frequency fundamental wave are humorous
Wave；Higher hamonic wave synthesizer, the higher hamonic wave synthesizer synthesize the odd harmonic and even-order harmonic for modifying, and generate tool
There is the higher hamonic wave of intact parity frequency multiplication；Virtual bass synthesizer, the virtual bass synthesizer is by the higher hamonic wave and former
Sound combines.
Optionally, the higher hamonic wave synthesizer includes: modem module and bandpass filter；
The modem module is used for: the odd harmonic or even-order harmonic and the first high frequency carrier and second is high
Frequency carrier multiplication obtains 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 being basis with the odd harmonic, the difference etc. of first high frequency carrier and the low frequency fundamental wave
In second high frequency carrier；
When being basis with the odd harmonic, the sum of first high frequency carrier and the low frequency fundamental wave are equal to described the
Two high frequency carriers.
Optionally, the higher hamonic wave synthesizer includes: balanced device and modification filter；
The balanced device is used to adjust the yield value of the odd harmonic and even-order harmonic；The modification filter is for taking
With the adjustment odd harmonic and even-order harmonic.
In order to solve the above technical problems, the embodiment of the invention also provides a kind of audio processing chips.The audio processing
Chip includes: decoding mould group, and the decoder module is for decoding the audio signal received；Virtual bass mould as described above
Group, the virtual bass mould group in the audio signal for adding corresponding virtual bass；And
Power amplifier, the power amplifier is used to amplify the audio signal of the virtual bass mould group output, to mention
For meeting the signal power of loudspeaker requirements.
Optionally, the audio signal is digital audio and video signals, and the audio processing chip further includes digital analog converter；Institute
It states digital analog converter to connect with the virtual bass mould group and the power amplifier respectively, be used for the virtual bass mould group
The digital audio and video signals of output are converted to analog audio signal.
The virtual bass generation method provided in the embodiment of the present invention 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 in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of audio processing chip provided in an embodiment of the present invention；
Fig. 3 is the connection timing diagram of virtual bass mould group provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of harmonic oscillator provided in an embodiment of the present invention；
Fig. 5 is the method flow diagram of virtual bass generation method provided in an embodiment of the present invention；
Fig. 6 be another embodiment of the present invention provides virtual bass generation method method flow diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
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 in an embodiment of the present invention.As shown in Figure 1, the application environment includes sound
Source 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
The virtual bass mould group 22 of corresponding virtual bass audio is added in frequency signal and for amplifying audio signal to meet loudspeaking
The power amplifier 23 for the signal power that device requires.
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.
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.It is mentioned using the embodiment of the present invention
The virtual bass mould group supplied, odd harmonic and even-order harmonic can be generated under Same Way, it is harmonious to help to obtain itself
Higher hamonic wave promotes the effect of virtual bass.
Fig. 3 is the structural schematic diagram of virtual bass mould group 22 provided in an embodiment of the present invention.As shown in figure 3, this is virtual low
Sound 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, is in low for detecting input audio signal
The low frequency fundamental wave in frequency domain.Multiple groups have can be set in the filter parameter of the filter, respectively and with different resonant frequencies
Loudspeaker is adapted.In use, suitable filter parameter can be selected according to the loudspeaker 30 that actual selection uses, thus
Obtain the low frequency fundamental wave for being in low frequency region.
The basic data of the low frequency fundamental wave as Audio Signal Processing can be provided to subsequent functional module and carry out virtually
The audio of bass enhances operation.
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 embodiments of the present invention to realize
Method.But it will be appreciated by persons skilled in the art that the harmonic oscillator 32 can also generate even-order harmonic, and with idol
Based on subharmonic, odd harmonic is obtained using corresponding method (utilizing the first high frequency carrier and the second high frequency carrier).
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 between target frequency point that unwanted non-targeted frequency point and expectation obtain in four above-mentioned frequency points is very big
's.Therefore, negative frequency can be ignored and filter out unwanted non-targeted frequency point simply by bandpass filter, required for acquisition
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。
It is based on the embodiment of the present invention about fm、2fm、3fmAnd 4fmSpecific processing example, those skilled in the art
Other nf can be generalized to based on identical principle or invention thinking by being readily apparent thatmIn, with odd number frequency multiplication or even number frequency multiplication
Based on, even number frequency multiplication required for obtaining or odd number frequency multiplication, such as with 5fmBased on, pass through the first high frequency carrier and
Two high frequency carriers obtain 6fm。
Although should be noted that in embodiments of the present invention only in a manner of functional name to above-mentioned audio processing core
Hardware circuit module in piece is described.But the hardware that those skilled in the art can disclose according to embodiments of the present invention
The function of executing required for circuit module selects existing any suitable electronic component or device to realize.
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 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 embodiment of the invention also provides one
The corresponding virtual bass generation method of kind.Based on the virtual bass generation method, itself harmonious higher hamonic wave can be obtained,
Better bass effect is provided.
Fig. 5 is the generation method of virtual bass provided in an embodiment of the present invention.As shown in figure 5, the virtual bass generation side
Method may include steps of:
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 be another embodiment of the present invention provides virtual bass generation side
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
Such implementation should not be considered as beyond the scope of the present invention.The computer software can be stored in computer-readable storage medium
In, 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 be magnetic
Dish, CD, read-only memory or random access memory etc..
Mode the above is only the implementation of the present invention is not intended to limit the scope of the invention, all to utilize this
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field is included within the scope of the present invention.
Claims (12)
1. a kind of virtual bass generation method characterized by comprising
Generate the odd harmonic of low frequency fundamental wave；
Based on the odd harmonic, by the modulation /demodulation of the first high frequency carrier and the second high frequency carrier, generate described low
The even-order harmonic of frequency fundamental wave；The difference of first high frequency carrier and the low frequency fundamental wave is equal to second high frequency carrier；
The odd harmonic and even-order harmonic are synthesized, the higher hamonic wave with intact parity frequency multiplication is obtained；
According to preset ratio, in conjunction with the higher hamonic wave and former sound.
2. virtual bass generation method according to claim 1, which is characterized in that 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, comprising:
According to modulation principle, the odd harmonic is multiplied with the first high frequency carrier, and in demodulation, with the second high frequency carrier
It is multiplied, obtains JieDuHuaYu II Decoction wave；
The non-targeted frequency point for filtering out the JieDuHuaYu II Decoction wave generates the even-order harmonic of the low frequency fundamental wave.
3. a kind of virtual bass generation method characterized by comprising
Generate the even-order harmonic of low frequency fundamental wave；
Based on the even-order harmonic, by the modulation /demodulation of the first high frequency carrier and the second high frequency carrier, generate described low
The odd harmonic of frequency fundamental wave；The sum of first high frequency carrier and the low frequency fundamental wave are equal to second high frequency carrier；
The odd harmonic and even-order harmonic are synthesized, the higher hamonic wave with intact parity frequency multiplication is obtained；
According to preset ratio, in conjunction with the higher hamonic wave and former sound.
4. virtual bass generation method according to claim 3, which is characterized in that based on the even-order harmonic, lead to
The modulation /demodulation for crossing the first high frequency carrier and the second high frequency carrier generates the odd harmonic of the low frequency fundamental wave, comprising:
According to modulation principle, the even-order harmonic is multiplied with the first high frequency carrier, and in demodulation, with the second high frequency carrier
It is multiplied, obtains JieDuHuaYu II Decoction wave；
The non-targeted frequency point for filtering out the JieDuHuaYu II Decoction wave generates the odd harmonic of the low frequency fundamental wave.
5. virtual bass generation method according to claim 1-4, which is characterized in that first high frequency carrier
With the hyperfrequency carrier signal that the second high frequency carrier is relative to odd harmonic or even-order harmonic.
6. a kind of virtual bass mould group characterized by comprising
Harmonic oscillator, the harmonic oscillator are used to generate the odd harmonic of low frequency fundamental wave, and are with the odd harmonic
Basis 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；
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.
7. a kind of virtual bass mould group characterized by comprising
Harmonic oscillator, the harmonic oscillator are used to generate the even-order harmonic of low frequency fundamental wave, and are with the even-order harmonic
Basis 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；
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.
8. virtual bass mould group according to claim 6 or 7, 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.
9. virtual bass mould group according to claim 8, 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.
10. virtual bass mould group according to claim 6 or 7, which is characterized in that the higher hamonic wave synthesizer includes:
Balanced device 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.
11. a kind of audio processing chip characterized by comprising
Mould group is decoded, the decoder module is for decoding the audio signal received；
Such as the described in any item virtual bass mould groups of claim 6-10, the virtual bass mould group is used in the audio signal
It is middle to add corresponding virtual bass；And
Power amplifier, the power amplifier is used to amplify the audio signal of the virtual bass mould group output, to provide symbol
Close the signal power of loudspeaker requirements.
12. audio processing chip according to claim 11, 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 mould group and
The power amplifier connection, for the digital audio and video signals of the virtual bass mould group output to be converted to analogue audio frequency letter
Number.
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