CN103297898B - Low frequency extending method and device - Google Patents
Low frequency extending method and device Download PDFInfo
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- CN103297898B CN103297898B CN201310253648.5A CN201310253648A CN103297898B CN 103297898 B CN103297898 B CN 103297898B CN 201310253648 A CN201310253648 A CN 201310253648A CN 103297898 B CN103297898 B CN 103297898B
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Abstract
The invention relates to a low frequency extending method and device. Low pitch signals are processed to obtain N subharmonic signals and N+M subharmonic signals, the obtained N subharmonic signals and N+M subharmonic signals are output through different sound tracks, the difference frequency principle of psychoacoustics is utilized to combine the N subharmonic signals and the N+M subharmonic signals into M subharmonic of the low pitch signals to enable listeners to feel existence of the M subharmonic of lower frequency subjectively and voice frequency output by a loud speaker to be true.
Description
Technical field
The present invention relates to audio signal processing technique field, more particularly to a kind of low frequency extended method and device.
Background technology
Audio system is the standard component of television set, and the quality of the audio system of a television set is directly influenced
The performance of whole machine.At present on the market most television sets are all flat panel TVs, are characterized in that the big image fault of screen is little, clearly
Degree is high, but as fuselage does thinner and thinner, frame is more and more narrow so that the volume of the voice output terminal speaker of television set receives greatly
Limit, and have to using less loudspeaker, do so just directly influences the LF-response of voice output so that television set
While image quality is improved constantly, Television Sound Quality is but constantly declining.
To solve this problem, generally solved using boom box system, relatively costly and inconvenient operation, also one
Kind of method is the amplitude for lifting bass part, but this method easily makes speaker overload and distortion.
The content of the invention
The main object of the present invention is to provide a kind of low frequency extended method and device, it is intended to so that the audio frequency of loudspeaker output
It is difficult distortion.
The present invention proposes a kind of low frequency extended method, it is characterised in that include：
Extract the bass signal in audio signal；
The n times harmonic signal and N+M rd harmonic signals of the bass signal, wherein N and M are produced according to the bass signal
For positive integer, and N is more than or equal to 2；
The n times harmonic signal is exported by the first sound channel, while the N+M rd harmonic signals is defeated by second sound channel
Go out, the n times harmonic signal and N+M rd harmonic signals generate M rd harmonic signals by difference frequency control principle.
Preferably, the n times harmonic signal and N+M subharmonic letter of the bass signal is being produced according to the bass signal
Number, wherein N and M be positive integer, and N be more than or equal to 2 the step of after also include for：
Extract the high pitched signal in audio signal；
The n times harmonic signal is added with the high pitched signal to obtain the first extension harmonic signal, and by the first sound
Road is exported；The N+M rd harmonic signals are added with the high pitched signal simultaneously obtain the second extension harmonic signal, and by the
Two sound channels are exported, and the first extension harmonic signal and the second extension harmonic signal generate M rd harmonic signals by difference frequency control principle
With the extension harmonic signal of high pitched signal composition.
Preferably, the n times harmonic signal and N+M subharmonic letter that the bass signal is produced according to the bass signal
Number the step of include：
N-K rd harmonic signals are generated into n times harmonic signal Jing after multiplier is multiplied with K rd harmonic signals, K is positive integer；
N+M-K harmonic signals are generated into N+M rd harmonic signals Jing after multiplier is multiplied with K rd harmonic signals.
Preferably, before the step of obtaining the first extension harmonic signal and obtain the second extension harmonic signal, the method
Also include：
The n times harmonic signal is removed into component by the first high-pass filter, to obtain the n times harmonic wave after component is removed
Signal；
The N+M rd harmonic signals are removed into component by the second high-pass filter, to obtain N+M time after component is removed
Harmonic signal.
Preferably, also include after the step of obtaining the n times harmonic signal and N+M rd harmonic signals after removing component：
N times harmonic signal after to removing component carries out gain-adjusted, while the N+M rd harmonic signals after to removing component
Carry out gain-adjusted.
The present invention also propose a kind of low-frequency extension unit, it is characterised in that including the first filtration module being sequentially connected electrically,
Harmonic generation module and output module, wherein：
First filtration module, for extracting audio signal in bass signal；
Harmonic generation module, for producing the n times harmonic signal of the bass signal, Yi Jigen according to the bass signal
The N+M rd harmonic signals of the bass signal are produced according to the bass signal, wherein N and M is positive integer, and N is more than or equal to 2；
Output module, for the n times harmonic signal to be exported by the first sound channel, while by the N+M rd harmonic signals
Exported by second sound channel, the n times harmonic signal and N+M rd harmonic signals generate M rd harmonic signals by difference frequency control principle.
Preferably, the second filtration module being connected with the input of the output module, the second filtering mould are also included
Block is used to extract the high pitched signal in audio signal；The output module is additionally operable to n times harmonic signal and the high pitched signal
It is added, and the first extension harmonic signal after being added is exported by the first sound channel, and by N+M rd harmonic signals and the high message
Number be added, and by second sound channel export be added after second extension harmonic signal, it is described first extension harmonic signal and second expand
Exhibition harmonic signal generates the extension harmonic signal of M rd harmonic signals and high pitched signal composition by difference frequency control principle.
Preferably, the harmonic generation module includes the first multiplication unit and the second multiplication unit, the first multiplication list
One end of unit is connected with first filtration module, and the other end is connected with the output module；Second multiplication unit and institute
State the first multiplication unit in parallel, wherein：
First multiplication unit, it is humorous for N-K rd harmonic signals and K rd harmonic signals to be generated into n times Jing after multiplier is multiplied
Ripple signal, K is positive integer；
Second multiplication unit, for N+M-K harmonic signals to be generated N+M time with K rd harmonic signals Jing after multiplier is multiplied
Harmonic signal.
Preferably, also including the 3rd filtration module and the 4th filtration module, described 3rd filtration module one end and described
One multiplication unit connects, and the other end is connected with the output module；Described 4th filtration module one end and the second multiplication list
Unit's connection, the other end is connected with the output module, wherein：
First filtration module, for the n times harmonic signal to be removed into component by the first high-pass filter, to be gone
Except the n times harmonic signal after component；
Second filtration module, for the N+M rd harmonic signals to be removed into component by the second high-pass filter, to obtain
Remove the N+M rd harmonic signals after component.
Preferably, also including the first gain module and the second gain module, described first gain module one end and described
Three filtration modules connect, and the other end is connected with the output module；Described second gain module one end and the described 4th filtering mould
Block connects, and the other end is connected with the output module, wherein：
First gain module, for the n times harmonic signal after to removing component gain-adjusted is carried out；
Second gain module, for the N+M rd harmonic signals after to removing component gain-adjusted is carried out.
Low frequency extended method proposed by the present invention and device, bass signal is obtained after treatment the n times of bass signal
Harmonic signal and N+M rd harmonic signals, and by the n times harmonic signal for obtaining sound channel output different with N+M rd harmonic signals Jing, lead to
The M rd harmonic signals that n times harmonic signal and N+M rd harmonic signals are synthesized psychoacoustic difference frequency control principle bass signal are crossed, is made
Hearer is subjective to feel that more low-frequency M subharmonic is present so that the audio frequency of loudspeaker output is truer.
Description of the drawings
Fig. 1 is the schematic flow sheet of the first embodiment of low frequency extended method of the present invention；
Fig. 2 is the schematic flow sheet of the second embodiment of low frequency extended method of the present invention；
Fig. 3 is the schematic flow sheet of the 3rd embodiment of low frequency extended method of the present invention；
Fig. 4 is the schematic flow sheet of the fourth embodiment of low frequency extended method of the present invention；
Fig. 5 is the structural representation of the first embodiment of low-frequency extension unit of the present invention；
Fig. 6 is the structural representation of the second embodiment of low-frequency extension unit of the present invention；
Fig. 7 is the structural representation of the 3rd embodiment of low-frequency extension unit of the present invention；
Fig. 8 is the structural representation of the fourth embodiment of low-frequency extension unit of the present invention；
Fig. 9 is the structural representation of the 5th embodiment of low-frequency extension unit of the present invention；
Figure 10 is the structural representation of the preferred embodiment of low-frequency extension unit of the present invention.
The realization of the object of the invention, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described further with regard to technical scheme.It should be appreciated that this
The described specific embodiment in place is not intended to limit the present invention only to explain the present invention.
With reference to Fig. 1, Fig. 1 is the schematic flow sheet of the first embodiment of low frequency extended method of the present invention.
The present embodiment proposes a kind of low frequency extended method, including：
Step S10, extracts the bass signal in audio signal；
The tone of sound mostlys come from frequency, the audio signal medium frequency being input into can be filtered by low pass filter higher
Signal obtain bass signal.
Step S20, according to the bass signal n times harmonic signal and N+M rd harmonic signals of the bass signal are produced, its
Middle N and M is positive integer, and N is more than or equal to 2；
The fundamental wave of n times harmonic signal is bass signal, and the frequency of n times harmonic signal is N times of bass signal, can be by low pass
The bass signal that filters filter is obtained, is multiplied by multiplier and obtains the n times harmonic signal and N+M subharmonic of the bass signal
Signal, for example, be multiplied by 2 rd harmonic signals that bass signal obtains in itself the bass signal by bass signal, 2 rd harmonic signal
Include a DC component and 2 order harmonic components.
Step S30, the n times harmonic signal is exported by the first sound channel, while by the N+M rd harmonic signals by second
Sound channel is exported, and the n times harmonic signal and N+M rd harmonic signals generate M rd harmonic signals by difference frequency control principle.
N times harmonic wave letter is exported by the first sound channel, while N+M rd harmonic signals are exported by second sound channel, the n times harmonic wave
Signal and N+M rd harmonic signals only poor M rd harmonic signals, the signal generation different with two kinds that second sound channel export of the first sound channel
Interfere, resulting interference signal is the difference of the frequency of original two sound waves, then bass signal M rd harmonic signals are obtained, and M is whole
Number is preferably 1, because the very low loudspeaker of the frequency of 1 subharmonic is difficult to export 1 rd harmonic signal, then can by the difference frequency control principle
1 rd harmonic signal is exported, and saves energy consumption.Wherein the first sound channel is L channel or R channel, when the first sound channel is L channel,
Second sound channel is R channel.
N is preferably 2, M and is preferably 1, when the first sound channel and second sound channel export respectively 2 rd harmonic signals and 3 subharmonic letter
Number when, minimum to the overlaying influence of original audio signal in the frequency band of harmonic wave, i.e., the frequency response on whole voice-grade channel affects most
It is little；Because 2 rd harmonic signals and 3 rd harmonic signals are individually exported, the parameter such as convenient amplitude to harmonic wave does independent accurate tune
Save and be independent of each other, can accurately adjust the tone color and figure of music, make the virtual sound of harmonic wave approach original sound as far as possible；By
In every kind of harmonic wave only by the output of passage, therefore crosstalk will not be produced, and because the wavelength of low frequency is longer, and be transmitted
Direction is consistent, affects also minimum in phase place.
Low frequency extended method proposed by the present invention, bass signal is obtained after treatment the n times harmonic wave letter of bass signal
Number and N+M rd harmonic signals, and different with the N+M rd harmonic signals Jing sound channel of the n times harmonic signal for obtaining is exported, by psychology
The difference frequency control principle of acoustics synthesizes the M subharmonic of bass signal, makes that hearer is subjective to feel that more low-frequency M subharmonic is present,
So that the audio frequency of loudspeaker output is truer.
With reference to Fig. 2, Fig. 2 is the schematic flow sheet of the second embodiment of low frequency extended method of the present invention.
The second embodiment of low frequency extended method of the present invention is proposed based on first embodiment, in the present embodiment step S20
Also include afterwards：
Step S40, extracts the high pitched signal in audio signal；
The relatively low signal of the audio signal medium frequency being input into is filtered by high-pass filter and obtains high pitched signal, the high message
Number it is added with bass signal, the audio signal being input into can be obtained.
Step S50, n times harmonic signal is added with high pitched signal to obtain the first extension harmonic signal, and by the first sound
Road is exported；N+M rd harmonic signals are added with high pitched signal to obtain the second extension harmonic signal simultaneously, and it is defeated by second sound channel
Go out, the first extension harmonic signal and the second extension harmonic signal generate M rd harmonic signals and high pitched signal group by difference frequency control principle
Into extension harmonic signal.
Defeated first extension harmonic signal and the second extension harmonic signal are distinguished by the output of the first sound channel and second sound channel, the
N times harmonic signal in one extension harmonic signal and the second extension harmonic signal is interfered with N+M rd harmonic signals, is generated high
The more prominent signal of bass that message number is constituted with M rd harmonic signals.
In the first embodiment, N-K rd harmonic signals are generated into n times harmonic wave Jing after multiplier is multiplied with K rd harmonic signals
Signal；N+M-K harmonic signals are generated into N+M rd harmonic signals Jing after multiplier is multiplied with K rd harmonic signals.For example, when N is equal to
For 8 when, can be multiplied with 7 rd harmonic signals by 1 rd harmonic signal and obtain 8 rd harmonic signals, or by 2 rd harmonic signals and 6
Rd harmonic signal is multiplied or 3 rd harmonic signals are multiplied with 5 rd harmonic signals or 4 rd harmonic signals and 4 rd harmonic signals
Multiplication obtains 8 rd harmonic signals.When N is equal to 2, can be multiplied with bass signal itself by bass signal and obtain bass signal
2 subharmonic, then bass signal is multiplied obtain 3 subharmonic of bass signal with 2 subharmonic for obtaining.
With reference to Fig. 3, Fig. 3 is the schematic flow sheet of the 3rd embodiment of low frequency extended method of the present invention.
The 3rd embodiment of low frequency extended method of the present invention, in the present embodiment, step S50 are proposed based on second embodiment
Also include before：
Step S60, component is removed by the n times harmonic signal by the first high-pass filter, is removed after component with obtaining
N times harmonic signal, by the N+M rd harmonic signals by the second high-pass filter remove component, with obtain remove component after
N+M rd harmonic signals.
When N and N+M is even number, include DC component in n times harmonic signal and N+M rd harmonic signals, by height
Bandpass filter can filter the DC component in n times harmonic signal and N+M rd harmonic signals；It is odd number when N and N+M is even number
When, include 1 order harmonic components in n times harmonic signal and N+M rd harmonic signals, n times can be filtered by high-pass filter humorous
1 order harmonic components in ripple signal and N+M rd harmonic signals, reduce DC component and the interference of 1 order harmonic components and affect.
May also comprise step S60 before step S30 in the first embodiment and n times harmonic signal is passed through into the first high-pass filtering
Device removes component, and to obtain the n times harmonic signal after component is removed, and N+M rd harmonic signals are gone by the second high-pass filter
Except component, to obtain the N+M rd harmonic signals after component are removed.
With reference to Fig. 4, Fig. 4 is the fourth embodiment of low frequency extended method of the present invention
The fourth embodiment of low frequency extended method of the present invention, in the present embodiment, step S60 are proposed based on 3rd embodiment
Also include afterwards：
Step S70, to the n times harmonic signal after removal component gain-adjusted is carried out, while N+M time after to removing component
Harmonic signal carries out gain-adjusted.
For example, 2 rd harmonic signals of bass signal are multiplied with bass signal itself by bass signal and are obtained, if bass signal
For COS (A), then according to the rd harmonic signal such as formula (1) of trigonometric function multiplication formula bass signal 2：
As shown in formula (1), the amplitude of 2 subharmonic and the amplitude of primary signal of acquisition have bigger difference, then need to lead to
Crossing the amplitude of gain-adjusted 2 subharmonic of adjustment makes its amplitude meet requirement, in order to 2 rd harmonic signal and original high message
Number it is added.Then n times harmonic signal and N+M rd harmonic signals need before the high pitched signal with primary signal is added
Gain-adjusted is carried out to n times harmonic signal and N+M rd harmonic signals, making the amplitude of n times harmonic signal and N+M rd harmonic signals expires
Foot is required.
In the first embodiment, step S60 and step S70 are may also comprise before step S30, n times harmonic signal is passed through
First high-pass filter removes component, and to obtain the n times harmonic signal after component is removed, and N+M rd harmonic signals are passed through into second
High-pass filter removes component, and to obtain the N+M rd harmonic signals after component are removed；And to the n times harmonic wave letter after removal component
Number gain-adjusted is carried out, while the N+M rd harmonic signals after to removing component carry out gain-adjusted.
With reference to Fig. 5, Fig. 5 is the structural representation of the first embodiment of low-frequency extension unit of the present invention.
The low-frequency extension unit that the present embodiment is proposed, including the first filtration module 10, the harmonic generation module that are sequentially connected
20 and output module 30, wherein：
First filtration module 10, for extracting audio signal in bass signal；
The tone of sound mostlys come from frequency, the audio signal medium frequency being input into can be filtered by low pass filter higher
Signal obtain bass signal, and the relatively low signal of the audio signal medium frequency that filters input by high-pass filter obtains height
Message number, the high pitched signal is added with bass signal, can obtain the audio signal being input into.
Harmonic generation module 20, for producing the n times harmonic signal of the bass signal according to the bass signal, and
The N+M rd harmonic signals of the bass signal are produced according to the bass signal, wherein N and M is positive integer, and N is more than or equal to
2；
The fundamental wave of n times harmonic signal is bass signal, and the frequency of n times harmonic signal is N times of bass signal, can be by low pass
The bass signal that filters filter is obtained, is multiplied by multiplier and obtains the n times harmonic signal and N+M subharmonic of the bass signal
Signal, for example, be multiplied by 2 rd harmonic signals that bass signal obtains in itself the bass signal by bass signal, 2 rd harmonic signal
Include a DC component and 2 order harmonic components.
Output module 30, for the n times harmonic signal to be exported by the first sound channel, while the N+M subharmonic is believed
Number exported by second sound channel, the n times harmonic signal and N+M rd harmonic signals are by difference frequency control principle generation M rd harmonic signals.
N times harmonic signal is exported by the first sound channel, while N+M rd harmonic signals are exported by second sound channel, the n times are humorous
Ripple signal and N+M rd harmonic signals only poor n times harmonic signal, the first sound channel and two kinds of different signals that second sound channel export
Raw to interfere, resulting interference signal is the difference of the frequency of original two sound waves, then bass signal M rd harmonic signals, M is obtained
Integer is preferably 1, because the very low loudspeaker of the frequency of 1 subharmonic is difficult to export 1 rd harmonic signal, then by the difference frequency control principle
Exportable 1 rd harmonic signal.
N is preferably 2, M and is preferably 1, when the first sound channel and second sound channel export respectively 2 rd harmonic signals and 3 subharmonic letter
Number when, minimum to the overlaying influence of original audio signal in the frequency band of harmonic wave, i.e., the frequency response on whole voice-grade channel affects most
It is little；Because 2 rd harmonic signals and 3 rd harmonic signals are individually exported, the parameter such as convenient amplitude to harmonic wave does independent accurate tune
Save and be independent of each other, can accurately adjust the tone color and figure of music, make the virtual sound of harmonic wave approach original sound as far as possible；By
In every kind of harmonic wave only by the output of passage, therefore crosstalk will not be produced, and because the wavelength of low frequency is longer, and be transmitted
Direction is consistent, affects also minimum in phase place.
Low-frequency extension unit proposed by the present invention, bass signal is obtained after treatment the n times harmonic wave letter of bass signal
Number and N+M rd harmonic signals, and different with the N+M rd harmonic signals Jing sound channel of the n times harmonic signal for obtaining is exported, by psychology
The difference frequency control principle of acoustics synthesizes the M subharmonic of bass signal, makes that hearer is subjective to feel that more low-frequency M subharmonic is present,
So that the audio frequency of loudspeaker output is truer.
With reference to Fig. 6, Fig. 6 is the structural representation of the second embodiment of low-frequency extension unit of the present invention.
The second embodiment of low-frequency extension unit of the present invention is proposed based on first embodiment, in the present embodiment
Also include the second filtration module 40 being connected with the input of output module 30, the second filtration module 40 is used to extract
High pitched signal in audio signal；Output module 30 is additionally operable to be added n times harmonic signal with the high pitched signal, and by first
Harmonic signal after sound channel output addition, and N+M rd harmonic signals are added with the high pitched signal, and it is defeated by second sound channel
The harmonic signal gone out after being added, the first extension harmonic signal and the second extension harmonic signal are generated M time by difference frequency control principle
The extension harmonic signal of harmonic signal and high pitched signal composition.
Defeated first extension harmonic signal and the second extension harmonic signal are distinguished by the output of the first sound channel and second sound channel, the
N times harmonic signal in one extension harmonic signal and the second extension harmonic signal is interfered with N+M rd harmonic signals, is generated high
The more prominent signal of bass that message number is constituted with M rd harmonic signals.
With reference to Fig. 7, Fig. 7 is the structural representation of the 3rd embodiment of low-frequency extension unit of the present invention.
In the third embodiment, harmonic generation module 20 includes the first multiplication unit 21 and the second multiplication unit 22, first
One end of multiplication unit 21 is connected 10 with the first filtration module, and the other end is connected with output module 30；Second multiplication unit 22 with
First multiplication unit 21 is in parallel, wherein：
First multiplication unit 21, for N-K rd harmonic signals to be generated into n times Jing after multiplier is multiplied with K rd harmonic signals
Harmonic signal；
Second multiplication unit 22, for N+M-K harmonic signals to be generated into N+M Jing after multiplier is multiplied with K rd harmonic signals
Rd harmonic signal.
For example, when N is equal to 8, can be multiplied with 7 rd harmonic signals by 1 rd harmonic signal and obtain 8 rd harmonic signals,
Or 2 rd harmonic signals are multiplied with 6 rd harmonic signals or 3 rd harmonic signals are multiplied with 5 rd harmonic signals or 4 times humorous
Ripple signal is multiplied with 4 rd harmonic signals and obtains 8 rd harmonic signals.When N is equal to 2, the first multiplication unit 21 can be believed by bass
Number it is multiplied with bass signal itself and obtains 2 subharmonic of bass signal, the second multiplication unit 22 is by bass signal and the first multiplication
2 subharmonic that unit 21 is obtained are multiplied and obtain 3 subharmonic of bass signal.
With reference to Fig. 8, Fig. 8 is the structural representation of the fourth embodiment of low-frequency extension unit of the present invention
Based on above-described embodiment, the fourth embodiment of low-frequency extension unit of the present invention is proposed, in the present embodiment, also included
3rd filtration module 50 and the 4th filtration module 60, one end of the 3rd filtration module 50 is connected 21 with the first multiplication unit, the other end
It is connected with output module 30；The one end of 4th filtration module 60 is connected with the second multiplication unit 22, and the other end connects with output module 30
Connect, wherein：
3rd filtration module 50, for the n times harmonic signal to be removed into component by the first high-pass filter, to obtain
Remove the n times harmonic signal after component；
4th filtration module 60, for the N+M rd harmonic signals to be removed into component by the second high-pass filter, to obtain
The N+M rd harmonic signals after component must be removed.
It is before n times harmonic signal and N+M harmonic signals are added respectively with high pitched signal, n times harmonic signal and N+M is humorous
Ripple signal removes component by high-pass filter.When N and N+M is even number, in n times harmonic signal and N+M rd harmonic signals
Include DC component, the DC component in n times harmonic signal and N+M rd harmonic signals can be filtered by high-pass filter；Work as N
With N+M be even number when for odd number when, include 1 order harmonic components in n times harmonic signal and N+M rd harmonic signals, by height
Bandpass filter can filter 1 order harmonic components in n times harmonic signal and N+M rd harmonic signals, reduce DC component and 1 time humorous
Wave component is disturbed and affected.
With reference to Fig. 9, Fig. 9 is the structural representation of the 5th embodiment of low-frequency extension unit of the present invention.
Based on above-described embodiment, the 5th embodiment of low-frequency extension unit of the present invention is proposed, in the present embodiment, also wrapped
Include：
First gain module 70, for the n times harmonic signal after to removing component gain-adjusted is carried out；
Second gain module 80, for the N+M rd harmonic signals after to removing component gain-adjusted is carried out.
For example, 2 rd harmonic signals of bass signal are multiplied with bass signal itself by bass signal and are obtained, if bass signal
For COS (A), then according to the rd harmonic signal such as formula (1) of trigonometric function multiplication formula bass signal 2：
As shown in formula (1), the amplitude of 2 subharmonic and the amplitude of primary signal of acquisition have bigger difference, then need to lead to
Crossing the amplitude of gain-adjusted 2 subharmonic of adjustment makes its amplitude meet requirement, in order to 2 rd harmonic signal and original high message
Number it is added.Then n times harmonic signal and N+M rd harmonic signals need before the high pitched signal with primary signal is added
Gain-adjusted is carried out to n times harmonic signal and N+M rd harmonic signals, making the amplitude of n times harmonic signal and N+M rd harmonic signals expires
Foot is required.
With reference to Figure 10, Figure 10 is the structural representation of the preferred embodiment of low-frequency extension unit of the present invention.
Based on the embodiment shown in Fig. 9, in the present embodiment, it is 1 that N is 2, M, in the present embodiment, including the first filtering
Module 10, harmonic generation module 20, the 3rd filtration module 50, the 4th filtration module 60, the first gain module 70, the second gain mould
Block 80, output module 30, annexation as previously discussed, also including first adder 1, wherein：
With reference to shown in Fig. 9 and Figure 10, the first filtration module 10 includes low pass filter 2, the input of first adder 1 with
Audio signal input end connects, and output end is connected with the input of low pass filter 2, and the second filtration module is filtered including the first high pass
The high-pass filter 4 of ripple device 3 and second, harmonic generation module 20 includes the first multiplier 5 and the second multiplier 6, low pass filter 2
Output end point three tunnels, two-way is connected with the input of the first multiplier 5, is connected with the input of the second multiplier 6 all the way；The
Three filtration modules 50 include the 3rd high-pass filter 7, and the 4th filtration module 60 includes the 4th high-pass filter 8, the first gain mould
Block includes the first amplifier 9, and the second gain module includes the second amplifier 11, the one end of the 3rd high-pass filter 7 and the first multiplication
Device 5 connects, and the first amplifier of the other end 9 connects, and the one end of the 4th high-pass filter 8 is connected with the second multiplier 6, the other end and
Two amplifiers 11 connect；Output module includes first adder 1 and second adder 12, the input of second adder 12 and the
The output end connection of the output end of one amplifier 9 and the first high-pass filter 3, output end is connected with the first sound channel；Second addition
The input of device 12 is connected with the output end of the output end of the second amplifier 11 and the second high-pass filter 4, output end and second
Sound channel connects.
The low-pass filtered device 2 of input signal generates the bass signal of original audio signal；First multiplier 5 is by LPF
The bass signal involution that device 2 is generated obtains the second harmonic signal of bass signal, and the second multiplier 6 generates low pass filter 2
The second harmonic signal that generates with the first multiplier 5 of bass signal be multiplied and obtain the harmonic signal of bass signal, 2 times are humorous
The 3rd high-pass filters of ripple signal Jing 7 remove the DC component in 2 rd harmonic signals, and after the first amplifier 9 is adjusted, Jing
Second adder 12 is exported with the first sound channels of high pitched signal phase adduction Jing, and the 4th high-pass filter of harmonic signal Jing 8 removes 3
1 order harmonic components in rd harmonic signal, and after the second amplifier 11 is adjusted, the adders 13 of Jing the 3rd and high pitched signal phase
Adduction Jing second sound channels are exported.
The preferred embodiments of the present invention are the foregoing is only, the scope of the claims of the present invention, every utilization is not thereby limited
The equivalent structure transformation that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other related technology necks
Domain, is included within the scope of the present invention.
Claims (10)
1. a kind of low frequency extended method, it is characterised in that include：
Extract the bass signal in audio signal；
The n times harmonic signal and N+M rd harmonic signals of the bass signal are produced according to the bass signal, wherein N and M is for just
Integer, and N is more than or equal to 2；
The n times harmonic signal is exported by the first sound channel, while the N+M rd harmonic signals are exported by second sound channel, institute
State n times harmonic signal and N+M rd harmonic signals and M rd harmonic signals are generated by difference frequency control principle.
2. method according to claim 1, it is characterised in that the bass signal is being produced according to the bass signal
N times harmonic signal and N+M rd harmonic signals, wherein N and M be positive integer, and N be more than or equal to 2 the step of after also include for：
Extract the high pitched signal in audio signal；
The n times harmonic signal is added with the high pitched signal to obtain the first extension harmonic signal, and it is defeated by the first sound channel
Go out；The N+M rd harmonic signals are added with the high pitched signal to obtain the second extension harmonic signal, and by the rising tone simultaneously
Road is exported, and the first extension harmonic signal and the second extension harmonic signal generate M rd harmonic signals and height by difference frequency control principle
The extension harmonic signal of message number composition.
3. method according to claim 1 and 2, it is characterised in that described that the bass is produced according to the bass signal
The step of n times harmonic signal and N+M rd harmonic signals of signal, includes：
N-K rd harmonic signals are generated into n times harmonic signal Jing after multiplier is multiplied with K rd harmonic signals, K is positive integer；
N+M-K harmonic signals are generated into N+M rd harmonic signals Jing after multiplier is multiplied with K rd harmonic signals.
4. method according to claim 3, it is characterised in that extend obtaining first and extending harmonic signal and obtain second
Before the step of harmonic signal, the method also includes：
The n times harmonic signal is removed into component by the first high-pass filter, to obtain the n times harmonic wave letter after component is removed
Number；
The N+M rd harmonic signals are removed into component by the second high-pass filter, to obtain the N+M subharmonic after component is removed
Signal.
5. method according to claim 4, it is characterised in that in the n times harmonic signal obtained after removing component and N+M time
Also include after the step of harmonic signal：
N times harmonic signal after to removing component carries out gain-adjusted, while the N+M rd harmonic signals after to removing component are carried out
Gain-adjusted.
6. a kind of low-frequency extension unit, it is characterised in that including the first filtration module, harmonic generation module being sequentially connected and
Output module, wherein：
First filtration module, for extracting audio signal in bass signal；
Harmonic generation module, for producing the n times harmonic signal of the bass signal according to the bass signal, and according to institute
The N+M rd harmonic signals that bass signal produces the bass signal are stated, wherein N and M is positive integer, and N is more than or equal to 2；
Output module, for the n times harmonic signal to be exported by the first sound channel, while by the N+M rd harmonic signals by
Two sound channels are exported, and the n times harmonic signal and N+M rd harmonic signals generate M rd harmonic signals by difference frequency control principle.
7. device according to claim 6, it is characterised in that also include be connected with the input of the output module
Two filtration modules, second filtration module is used to extract the high pitched signal in audio signal；The output module is additionally operable to N
Rd harmonic signal is added with the high pitched signal, and exports the first extension harmonic signal after being added by the first sound channel, and by N
+ M rd harmonic signals are added with the high pitched signal, and export the second extension harmonic signal after being added by second sound channel, described
What the first extension harmonic signal and the second extension harmonic signal were consisted of difference frequency control principle generation M rd harmonic signals and high pitched signal
Extension harmonic signal.
8. device according to claim 7, it is characterised in that the harmonic generation module includes the first multiplication unit and the
Square law unit, one end of first multiplication unit is connected with first filtration module, the other end and the output module
Connection；Second multiplication unit is in parallel with first multiplication unit, wherein：
First multiplication unit, it is humorous for N-K rd harmonic signals and K rd harmonic signals to be generated into n times Jing after multiplier is multiplied
Ripple signal, K is positive integer；
Second multiplication unit, for N+M-K harmonic signals to be generated N+M time with K rd harmonic signals Jing after multiplier is multiplied
Harmonic signal.
9. device according to claim 8, it is characterised in that also including the 3rd filtration module and the 4th filtration module, institute
State the 3rd filtration module one end to be connected with first multiplication unit, the other end is connected with the output module；4th filter
Ripple module one end is connected with second multiplication unit, and the other end is connected with the output module, wherein：
3rd filtration module, for the n times harmonic signal to be removed into component by the first high-pass filter, to be gone
Except the n times harmonic signal after component；
4th filtration module, for the N+M rd harmonic signals to be removed into component by the second high-pass filter, to obtain
Remove the N+M rd harmonic signals after component.
10. device according to claim 9, it is characterised in that also including the first gain module and the second gain module, institute
State first gain module one end to be connected with the 3rd filtration module, the other end is connected with the output module；Described second increases
Beneficial module one end is connected with the 4th filtration module, and the other end is connected with the output module, wherein：
First gain module, for the n times harmonic signal after to removing component gain-adjusted is carried out；
Second gain module, for the N+M rd harmonic signals after to removing component gain-adjusted is carried out.
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| CN1494353A (en) * | 2002-09-09 | 2004-05-05 | ���µ�����ҵ��ʽ���� | Sounder signal processor and its method |
| CN1805612A (en) * | 2005-01-14 | 2006-07-19 | 三星电子株式会社 | Method and apparatus for audio bass enhancement |
| CN102957988A (en) * | 2011-08-24 | 2013-03-06 | 半导体元件工业有限责任公司 | Audio signal processing circuit |
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| CN1494353A (en) * | 2002-09-09 | 2004-05-05 | ���µ�����ҵ��ʽ���� | Sounder signal processor and its method |
| CN1805612A (en) * | 2005-01-14 | 2006-07-19 | 三星电子株式会社 | Method and apparatus for audio bass enhancement |
| CN102957988A (en) * | 2011-08-24 | 2013-03-06 | 半导体元件工业有限责任公司 | Audio signal processing circuit |
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