CN106658345B - A kind of virtual surround sound playback method, device and equipment - Google Patents
A kind of virtual surround sound playback method, device and equipment Download PDFInfo
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- CN106658345B CN106658345B CN201611030589.5A CN201611030589A CN106658345B CN 106658345 B CN106658345 B CN 106658345B CN 201611030589 A CN201611030589 A CN 201611030589A CN 106658345 B CN106658345 B CN 106658345B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation
- H04S5/005—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation of the pseudo five- or more-channel type, e.g. virtual surround
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- H—ELECTRICITY
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- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/01—Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]
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Abstract
The present invention provides a kind of virtual surround sound playback method, playing device and playback equipment, and wherein playback method includes：Determine the type of present frame voice signal；Determine that present frame voice signal corresponds to the position coordinates of sound source according to present sound signals type and previous frame voice signal type；Corresponding HRTF filter function is selected according to the position coordinates that present frame voice signal corresponds to sound source；L channel trap signal is obtained according to HRTF filter function filtering present frame left channel signals, obtains right channel trap signal according to HRTF filter function filtering present frame right-channel signals；L channel trap signal is sent to left speaker, right channel trap signal is sent to right loudspeaker.After the sound that left speaker and right loudspeaker play is applied to user, the feeling of the opposite variation of sound source position is experienced at usable family, that is, produces true virtual echo effection.
Description
Counted fields
The present invention relates to acoustic processing play-back technology field, in particular to a kind of virtual surround sound playback method, this another hair
It is bright that a kind of playback equipment for realizing aforementioned virtual surround sound playback method is also provided.
Background count
Virtual surround sound play-back technology is in two-channel Equipment Foundations, user is made to experience sound from multiple orientation
Sound play-back technology.Along with the development that virtual reality counts, virtual surround sound is counted in TV, virtual reality device at present
It is used widely.
Fig. 1 is a kind of virtual surround sound playback method schematic illustration in the prior art.Such as Fig. 1, mainstream is virtual at present
Surround sound playback method uses multiple HRTF (head related transfer function, Head Related Transfer Function) module
Respectively to the left channel signals S of inputLWith right-channel signals SRIt is filtered.L channel filtering after each HRTF modular filtration
Signal SLnewIt is sent to left speaker broadcasting, the right channel trap signal S after each HRTF modular filtration simultaneouslyRnewIt sends simultaneously
It is played to right loudspeaker.
Using above-mentioned playback method, because left channel signals and right-channel signals are handled by multiple HRTF modular filtrations,
So being able to use family to experience sound is issued from multiple positions.But such circular acoustic processing method is only capable of making user
Sound is experienced to issue from multiple positions, can not user experience the mobile feeling of sound generation source, that is, user cannot be made to feel
It is experienced by real surround sound.
Summary of the invention
To solve the problems, such as that virtual surround sound playback method can not generate real surround sound experience in the prior art for this, this
Invention provides a kind of new virtual surround sound playback method；Separately the present invention also provides realize aforementioned virtual surround sound playback method
Playing device and playback equipment.
The present invention provides a kind of virtual surround sound playback method, including：
Receive present frame left channel signals and present frame right-channel signals；
The type of present frame voice signal is determined according to present frame left channel signals and present frame right-channel signals；
Whether the type for judging present frame voice signal is identical as the type of previous frame voice signal；
If they are the same, then determine present frame voice signal at the sound according to the position coordinates that previous frame voice signal corresponds to sound source
The position coordinates in source；If it is different, then corresponding to the position coordinates of sound source using initial position co-ordinates as present frame voice signal；According to
The position coordinates that present frame voice signal corresponds to sound source select corresponding HRTF filter function；
Present frame left channel signals, which are filtered, according to the HRTF filter function obtains L channel trap signal, and, according to
The HRTF filter function filtering present frame right-channel signals obtain right channel trap signal；
The L channel trap signal is sent to left speaker, and, the right channel trap signal is sent to the right side
Loudspeaker.
Optionally, determine that present frame voice signal corresponds to sound source according to the position coordinates that previous frame voice signal corresponds to sound source
Position coordinates include：
The intensity of present frame voice signal is calculated according to present frame left channel signals and present frame right-channel signals；
Judge whether the intensity of present frame voice signal is greater than the intensity of previous frame voice signal；
If so, increasing by the first count value；If the first count value is greater than or equal to the first upper limit threshold, make previous frame
The numerical value that the vertical position coordinate that voice signal corresponds to sound source obtains after increasing corresponds to hanging down for sound source as present frame voice signal
Straight position coordinates, and the first count value is made to be initialized as the first numerical value；If the first count value, will less than the first upper limit threshold
The vertical position coordinate that previous frame voice signal corresponds to sound source corresponds to the vertical position coordinate of sound source as present frame voice signal；
If it is not, then reducing the first count value；If the first count value is less than or equal to the first lower threshold, make previous frame
The numerical value that the vertical position coordinate that voice signal corresponds to sound source obtains after reducing corresponds to hanging down for sound source as present frame voice signal
Straight position coordinates, and the first count value is made to be initialized as the first numerical value；If the first count value, will less than the first lower threshold
The vertical position coordinate that previous frame voice signal corresponds to sound source corresponds to the vertical position coordinate of sound source as present frame voice signal；
Wherein, the first numerical value less than the first upper limit threshold but is greater than the first lower threshold.
Optionally, determine that present frame voice signal corresponds to sound source according to the position coordinates that previous frame voice signal corresponds to sound source
Position coordinates include：
Judge whether the ratio between present frame L channel sound signal intensity and previous frame L channel sound signal intensity are greater than to work as
The ratio between previous frame right channel sound signal strength and previous frame right channel sound signal strength；
If so, increasing by the second count value；If the second count value is greater than or equal to the second upper limit threshold, make previous frame
The numerical value that the horizontal position coordinate that voice signal corresponds to sound source obtains after increasing corresponds to the water of sound source as present frame voice signal
Flat position coordinates, and the second count value is made to be initialized as second value；If the second count value, will less than the second upper limit threshold
The horizontal position coordinate that previous frame voice signal corresponds to sound source corresponds to the horizontal position coordinate of sound source as present frame voice signal；
If it is not, then reducing the second count value；If the second count value is less than or equal to the second lower threshold, make previous frame
The numerical value that the horizontal position coordinate that voice signal corresponds to sound source obtains after reducing corresponds to the water of sound source as present frame voice signal
Flat position coordinates, and the second count value is made to be initialized as second value；If the second count value makes less than the second lower threshold
The horizontal position coordinate that previous frame voice signal corresponds to sound source corresponds to the horizontal position coordinate of sound source as present frame voice signal；
Wherein, second value less than the second upper limit threshold but is greater than the second lower threshold.
Optionally, determine that present frame voice signal corresponds to sound source according to the position coordinates that previous frame voice signal corresponds to sound source
Position coordinates include：
Judge whether present frame L channel sound signal intensity is greater than present frame right channel sound signal strength and previous frame
Right channel sound signal strength；
If so, increasing by the second count value；If the second count value is greater than or equal to the second upper limit threshold, make previous frame
The numerical value that the horizontal position coordinate that voice signal corresponds to sound source obtains after increasing corresponds to the water of sound source as present frame voice signal
Flat position coordinates, and the second count value is made to be initialized as second value；If the second count value, will less than the second upper limit threshold
The horizontal position coordinate that previous frame voice signal corresponds to sound source corresponds to the horizontal position coordinate of sound source as present frame voice signal；
If it is not, then reducing the second count value；If the second count value is less than or equal to the second lower threshold, make previous frame
The numerical value that the horizontal position coordinate that voice signal corresponds to sound source obtains after reducing corresponds to the water of sound source as present frame voice signal
Flat position coordinates, and the second count value is made to be initialized as second value；If the second count value makes less than the second lower threshold
The horizontal position coordinate that previous frame voice signal corresponds to sound source corresponds to the horizontal position coordinate of sound source as present frame voice signal；
Wherein, second value less than the second upper limit threshold but is greater than the second lower threshold.
Optionally, the type of present frame voice signal is determined according to present frame left channel signals and present frame right-channel signals
Including：
Judge whether the intensity of present frame left channel signals is more than or equal to the intensity of present frame right-channel signals；
If so, selection present frame left channel signals determine the characteristic parameter sequence of present frame sound；If it is not, then selection is worked as
Previous frame right-channel signals determine the characteristic parameter sequence of present frame sound；
The characteristic parameter sequence of the corresponding simplified HMM algorithm filtering present frame voice signal of various sound types is respectively adopted
Column obtain the probability that hair present frame voice signal is various sound types；
The corresponding sound type of maximum probability is determined as to the type of present frame voice signal.
Optionally, the type of present frame voice signal is determined according to present frame left channel signals and present frame right-channel signals
Including：
It calculates present frame left channel signals and present frame right-channel signals corresponds to the average value of sampled point up-sampling value；
The characteristic parameter sequence of present frame sound is determined according to the average value of each sampled point up-sampling value；
The characteristic parameter sequence of the corresponding simplified HMM algorithm filtering present frame voice signal of various sound types is respectively adopted
Column obtain the probability that hair present frame voice signal is various sound types；
The corresponding sound type of maximum probability is determined as to the type of present frame voice signal.
Optionally, the characteristic parameter sequence for determining present frame sound according to the average value of each sampled point up-sampling value is：
According to the MFCC argument sequence of the mean value calculation present frame sound of each sampled point up-sampling value；
Using the MFCC argument sequence as the characteristic parameter sequence of present frame sound.
Optionally, L channel trap signal is sent to left speaker, and, right channel trap signal is sent to the right side and is raised
Before sound device, further include：
Antialiasing handles L channel trap signal and right channel trap signal.
The present invention also provides a kind of virtual surround sound playing devices, including filter, memory and communication interface；
Filter, memory and communication interface are connected by communication bus；
Communication interface is for sending and receiving signal；
Memory is for storing program code；
Filter is used to read the program code of memory storage, and executes foregoing virtual surround sound broadcasting side
Method.
The present invention also provides a kind of virtual surround sound playback equipment, including left speaker, right loudspeaker and foregoing
Virtual surround sound playing device.
Using virtual surround sound playback method provided in an embodiment of the present invention, if at one section of the sound go of a certain type
Between, then virtual sound source can be determined in the opposite position of different frame by comparing the intensity of sound of consecutive frame sound in this period of time
Set coordinate；Corresponding HRTF filter function may be selected according to virtual sound source relative position coordinates, letter is filtered using corresponding HRTF
Several pairs of left channel signals and right-channel signals handle the L channel trap signal and right channel that can obtain having position characteristic
Trap signal, left speaker play sound, the right loudspeaker that L channel trap signal obtains and play right channel trap signal and obtain
Sound be applied to the feeling that after user family can be used to experience the opposite variation of sound source position, that is, produce true virtual
Echo effection.
Detailed description of the invention
To be illustrated more clearly that background technique or count protocol of the invention, below to existing counting or specific embodiment
The attached drawing of middle combined use is briefly described；It should be evident that below in conjunction with the attached drawing side of being only for of specific embodiment
Just understand the embodiment of the present invention, for this field commonly counting personnel, without creative efforts, may be used also
To obtain other drawings based on these drawings；
Fig. 1 is a kind of virtual surround sound playback method schematic illustration in the prior art；
Fig. 2 is virtual surround sound playback method schematic diagram provided in an embodiment of the present invention；
Fig. 3 is the type flow figure for the voice signal that the embodiment of the present invention determines present frame；
Fig. 4 is the sound field coordinate schematic diagram that the virtual surround sound playback method of the embodiment of the present invention uses；
Fig. 5 is that the embodiment of the present invention according to the corresponding sound source vertical position coordinate of previous frame voice signal determines present frame sound
The vertical position coordinate method flow diagram of the corresponding sound source of sound signal；
Fig. 6 is that the embodiment of the present invention according to the horizontal position coordinate that previous frame voice signal corresponds to sound source determines present frame sound
Sound signal corresponds to the horizontal position coordinate method flow diagram of sound source；
Fig. 7 is virtual surround sound playing device schematic diagram provided in an embodiment of the present invention；
Fig. 8 is virtual surround sound playback equipment schematic diagram provided in an embodiment of the present invention；
Wherein：The virtual surround sound playing device of 1-, 11- filter, 12- memory, 13- communication interface, 14- communication are total
Line, 2- left speaker, the right loudspeaker of 3-.
Specific embodiment
The present invention provides a kind of circular playback method of Virtual Sound, playing device and playback equipment, can be according to left channel signals
The position coordinates of sound source are determined with right-channel signals, and select corresponding HRTF filter function to a left side according to the position coordinates of sound source
Sound channel signal and right-channel signals are filtered, obtain corresponding L channel trap signal and right channel trap signal.It is left
Family can be used to experience the relative position variation of sound source for sound channel trap signal and right channel trap signal after playing, that is, use
Experience virtual surround sound experience in family.
In order to make the personnel of this counted fields more fully understand the technical solution in the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, the count protocol in the embodiment of the present invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to protection of the present invention
Range.
It should be noted that following virtual surround sound playback methods are to realize that playback equipment should based on certain playback equipment
It is playback equipment at least with left speaker and right loudspeaker.In practical application, what playback equipment can be a kind of for television set
Playing audio/video is also possible to only play the stereo set of sound.In addition, to meet true virtual surrounding sound effect,
Left speaker and right loudspeaker should be arranged on the position of corresponding following methods parameter.
Fig. 2 is virtual surround sound playback method schematic diagram provided in an embodiment of the present invention.It is provided in this embodiment such as Fig. 2
Virtual surround sound playback method includes the following steps.
S101：Receive present frame left channel signals and present frame right-channel signals.
S102：The type of present frame voice signal is determined according to present frame left channel signals and present frame right-channel signals.
Fig. 3 is the type flow figure for the voice signal that the embodiment of the present invention determines present frame.Such as Fig. 3, in the present embodiment,
Determined in S102 according to present frame left channel signals and present frame right-channel signals the voice signal of present frame type include with
Lower sub-step.
S1021：It calculates present frame left channel signals and present frame right-channel signals corresponds to being averaged for sampled point up-sampling value
Value.
According to the coding rule of sound, present frame left channel signals and present frame right-channel signals adopting by setting quantity
Sampling point composition, the sampled value of sampled point arrange form certain types of sound sequentially in time.Because present frame L channel is believed
Number and present frame right-channel signals be that sound source under same environment scene issues, so present frame left channel signals and present frame
The sampled value that sampled point is corresponded in right-channel signals has the probability of positive correlation very big, therefore can be believed by present frame L channel
Number correspond to the average value of sampled point up-sampling value with present frame right-channel signals, and by the average value of each sampled point up-sampling value
Arrangement forms the voice signal for representing the sending of present frame sound source sequentially in time.
The average value that sampled point up-sampling value is sought in S1021 is that (present frame is left for subsequent determining present frame voice signal
Sound channel signal and present frame right-channel signals) voice signal type.Certainly, due to present frame left channel signals and present frame
The sampled value of right-channel signals has the probability of positive correlation very big, in other embodiments, can also believe present frame L channel
Number or one of present frame right-channel signals (namely sequentially in time by the sampled point sampled value of present frame left channel signals
The arrangement of the sampled point sampled value of arrangement or present frame right-channel signals sequentially in time) as determining present frame voice signal
The foundation of type；For example, can be by comparing present frame left channel signals intensity and present frame right-channel signals intensity, selection is wherein
The type of intensity biggish one determining voice signal.
S1022：The characteristic parameter sequence of present frame sound is determined according to the average value of each sampled point up-sampling value.
Aforementioned obtained each sampled point sampled value of present frame, which is only through temporal signatures, indicates the voice signal of present frame, and
The type of voice signal could be identified by the frequency domain character of sound, therefore is also needed in the embodiment of the present invention according to each sampling
The mean value calculation of point sampling value can represent the frequecy characteristic argument sequence of the type of present frame voice signal.
In the embodiment of the present invention, the MFCC of present frame sound is calculated using the sampled value average value arrangement of aforementioned each sampled point
Parameter (Mel-scale Frequency Cepstral Coefficients, Mel Cepstral Frequency Coefficients) sequence, and MFCC is joined
Characteristic parameter sequence of the Number Sequence as present frame voice signal.MFCC parameter is fallen what Meier scale frequency domain extracted
Frequency spectrum parameter, meets the auditory properties of human ear, therefore uses it can be more accurate as the characteristic parameter of present frame voice signal
The auditory properties of simulation human ear.The specific calculation method of MFCC parameter can refer to has document in the prior art, herein no longer
Expansion statement.
In other embodiments, except characteristic parameter sequence of the MFCC argument sequence as present frame voice signal can be used
Outside, LPCC (Linear Prediction cepstrum coefficient, linear prediction scramble spectral function) ginseng also can be used
Characteristic parameter sequence of the Number Sequence as present frame voice signal.
S1023：The feature of the corresponding simplification HMM algorithm filtering present frame voice signal of various sound types is respectively adopted
Argument sequence obtains the probability that present frame voice signal is various sound types.
HMM model (Hidden Markov Model, Hidden Markov Model) is a kind of probability statistics system being widely used
Model is counted, five-tuple { N, M, π, A, B } can be used to indicate that wherein A is the transfer matrix of the hidden state of HMM model, B HMM
Confusion matrix, the π of model are initial shape probability of state, and N is input of the aforementioned known characteristic parameter sequence as model, M
It is the probability that HMM model corresponds to sound type for present frame voice signal.
The corresponding HMM model of aforementioned various sound types is joined by the MFCC feature of the various voice signals of known same type
Number Sequence training is obtained as input, such as obtains representing the HMM of voice by the MFCC characteristic parameter sequence of a variety of voice
Model.During concrete operation, initial estimation first can be carried out to the parameter of HMM model { π, A, B }, then be calculated using forward-backward algorithm
Method, efficiency assessment and amendment using the MFCC characteristic sequence of same type voice signal to initial estimation parameter optimize mould
Shape parameter must reach setting accuracy.Specific calculation method can refer to existing literature, also not reinflated narration herein.It should infuse
Meaning, the identification that sound type is carried out using HMM model is only a kind of optinal plan of the invention, in other embodiments of the invention
In, the identification process of other known mathematical model simulated sound type can also be used, determine the type of voice signal.
S1024：The corresponding sound type of maximum probability is determined as to the type of present frame voice signal.
If present frame voice signal is the sound type of a certain determination, the corresponding HMM model of this sound type is used
After the characteristic parameter sequence for handling present frame voice signal, obtained probability should be maximum.It is counter to push away, if it is known that each HMM mould
It, can will the wherein corresponding sound of maximum probability after obtaining corresponding probability after the characteristic parameter sequence of type processing present frame voice signal
Sound type is determined as the type of present frame voice signal.
After the completion of S102 is executed, S103 and corresponding subsequent step can be sequentially carried out.
The particular content of the present embodiment in order to facilitate understanding simply introduces the sound field coordinate determined in the present embodiment first
System.Described sound field refers to the two dimensional field space determined in the plane in the present embodiment.Fig. 4 is virtual ring of the embodiment of the present invention
The sound field coordinate system schematic diagram used around sound playback method；Such as Fig. 4, in the present embodiment, with left speaker in playback equipment and
Horizontal axis of the right loudspeaker line as sound field, using the midpoint of left speaker and right loudspeaker as coordinate origin O, with mistake
Coordinate origin O and vertical coordinate axle perpendicular to the straight line of two loudspeaker lines as sound field；It is raised by right loudspeaker to a left side
The coordinate of sound device, horizontal axis is gradually increased；By playback equipment to user, the coordinate of vertical coordinate axle increases.
Using sound field coordinate system above-mentioned, the position coordinates of sound source include horizontal position coordinate and vertical position coordinate.
Based on practical experience, the sound that sound source issues all has certain duration, and the sound that different sound sources issue
Between generally have more seamlessly transit.Correspondingly, playback equipment play sound when, if the type of present frame sound source and
The type of previous frame sound source is identical, then in two frames sound source be same sound source Probability maximum.Therefore, if the class of present frame sound source
Type is identical with the type of previous frame sound source, then can determine that two frame voice signals are issued by same sound source；And if present frame sound source
Type and previous frame sound source type it is different, then can determine that two frame voice signals are issued by different sound sources.
If present frame voice signal and previous frame voice signal are issued by same sound source, can be believed according to previous frame sound
The position coordinates of number corresponding sound source determine that present frame voice signal corresponds to the position coordinates of sound source；And if present frame voice signal
Type it is different with the type of previous frame voice signal, then determine that the corresponding sound source of previous frame voice signal has been lost, be
Prevent the position coordinates for determining present frame voice signal again on the basis of previous frame voice signal corresponding sound source position coordinate
Caused by the sense of hearing it is puzzled, can be using initial position co-ordinates as the position coordinates of the corresponding sound source of present frame voice signal.
S103：Whether the type for judging present frame voice signal is identical as the type of previous frame voice signal；If they are the same, then
Execute S104；If it is different, then executing S105.
According to actual use experience, during playback equipment plays sound, sound has certain contents attribute (all
Such as tone color, vibration frequency), user can determine type (the namely class of voice signal of sound according to the contents attribute of sound
Type).For example, sound is determined as voice, tweedle, hoofbeat, machine roar, report and aircraft sound.User is by listening
To sound contents attribute by sound carry out Type division, could judge whether the sound type successively heard identical, whether by
Same sound source issues.
S104：The position coordinates of present frame sound source are determined according to the position coordinates of previous frame sound source；Then execute S106.
S105：Using initial coordinate as the position coordinates of present frame sound source；Then execute S106.
According to the sound field coordinate system of foundation, the position coordinates of sound source include horizontal position coordinate and vertical position coordinate；?
Under present frame voice signal type and the identical situation of previous frame voice signal type, according to the corresponding sound of previous frame voice signal
The position coordinates in source determine that the position coordinates of the corresponding sound source of present frame voice signal include corresponding according to previous frame voice signal
The vertical position coordinate of sound source determine the vertical position coordinate of the corresponding sound source of present frame voice signal.
According to the experience of life：If sound source is not close to user (assuming that the generation intensity of sound source changes), user listens
The intensity of sound arrived can be increasing；And if sound source is far from user, the intensity of sound that user hears can be smaller and smaller.Cause
This, just can determine that sound source in vertical direction by comparing the intensity of present frame voice signal and the intensity of previous frame voice signal
Situation of change.
Fig. 5 is that the embodiment of the present invention according to the corresponding sound source vertical position coordinate of previous frame voice signal determines present frame sound
The vertical position coordinate method flow diagram of the corresponding sound source of sound signal.Such as Fig. 5, according to the corresponding sound source of previous frame voice signal
Vertical position coordinate determines that the vertical position coordinate of the corresponding sound source of present frame voice signal includes the following steps.
S1051：The intensity of present frame voice signal is calculated according to present frame left channel signals and present frame right-channel signals.
The intensity of present frame voice signal refers to the energy size of present frame voice signal.In practical calculating, present frame
The intensity of voice signal can be the sum of all sampled point energy in present frame voice signal, be also possible to present frame voice signal
In all sampled point energy average value.
In one embodiment, the intensity of sound and present frame right-channel signals of present frame left channel signals can be calculated separately
Then intensity of sound makes the intensity of sound of present frame left channel signals be added to obtain with the intensity of sound of present frame right-channel signals
Present frame intensity of sound.
In another embodiment, present frame left channel signals can also be calculated and present frame right-channel signals correspond on sampled point
Sampled value average value, the intensity of present frame voice signal is determined further according to the sampled value mean value of each sampled point.
S1052：Judge whether present frame sound signal intensity is greater than the intensity of previous frame voice signal；If so, executing
S1053；If it is not, then executing S1057；
S1053：Increase by the first count value；Then execute S1054.
S1054：Judge whether the first count value is greater than or equal to the first upper limit threshold；If so, executing S1055；If it is not,
Then execute S1056.
S1055：Previous frame voice signal is set to correspond to numerical value that the vertical position coordinate of sound source increases as present frame
Voice signal corresponds to the vertical position coordinate of sound source, and the first count value is made to be initialized as the first numerical value.
S1056：Previous frame voice signal is corresponded into the vertical position coordinate of sound source as present frame voice signal at the sound
The vertical position coordinate in source.
S1057：Judge whether the intensity of present frame voice signal is less than the intensity of previous frame voice signal；If so, holding
Row S1058；If it is not, then executing S1056.
S1058：Reduce the first count value；Then execute S1059.
S1059：Judge whether the first count value is less than or equal to the first lower threshold；If so, executing S10510；If
It is no, then execute S1056.
S10510：The numerical value obtained after reducing the corresponding sound source vertical position coordinate of previous frame voice signal is as current
The corresponding sound source vertical position coordinate of frame voice signal, and the first count value is made to be initialized as the first numerical value.
In S1055, it is assumed that the vertical position coordinate that previous frame voice signal corresponds to sound source is y, then makes the vertical of sound source
It is y+1 that position, which increases to obtain present frame voice signal to correspond to the vertical position coordinate of sound source,；It is corresponding, in S10510, make
The vertical position coordinate that previous frame sound-source signal corresponds to sound source reduces to obtain the corresponding sound source upright position of present frame voice signal
Coordinate can be y-1.
In the present embodiment, the numberical range of the first upper limit threshold can be [1,1000], the numberical range of the first lower threshold
It can be [- 1, -1000], the value range of corresponding first numerical value can be (- 999,999).To prevent vertical position coordinate suddenly big
Suddenly small and acoustic distance sense when causing follow-up play reciprocal fluctuation, while guaranteeing that sound source position can have again and largely becoming
Change, preferably sets 10 for the first upper limit threshold in the present embodiment, sets -10 for the first lower threshold.
It is contemplated that first lower threshold is set as -10, in the strong of voice signal if the first upper limit threshold is set as 10
In the case of degree sequentially increases or sequentially reduces, the position coordinates that voice signal corresponds to virtual sound source after 10 frames can just change.
In other embodiments, if the first upper limit threshold is set as 1, the first lower threshold is set as -1, then in present frame sound source
When the intensity of sound difference of intensity of sound and previous frame sound source, sound source position can change.In practical application, such as big gun
The movement speed of the sound sources such as bullet, aircraft quickly, therefore can will be under the first upper limit threshold of the type of such voice signal and first
It is smaller to limit threshold value setting；And the movement speed very little of the sound sources such as personnel, machine, therefore can be by the type of such voice signal
The first upper limit threshold and the first lower threshold setting it is larger.
It should be noted herein that in other embodiments, can also only compare present frame sound signal intensity and previous frame sound
Signal strength size determines whether to adjust the position of virtual sound source, and without counting statistics.
According to real life experience：If sound source moves to the left, present frame L channel sound signal intensity and upper one
The ratio between frame L channel sound signal intensity is greater than present frame right channel sound signal strength and previous frame right channel sound signal is strong
The ratio between degree,；If sound source moves to the right, present frame L channel sound signal intensity and previous frame L channel voice signal are strong
The ratio between degree is less than the ratio between present frame right channel sound signal strength and previous frame right channel sound signal strength.Therefore, pass through ratio
Believe compared with the ratio between present frame L channel sound signal intensity and previous frame L channel sound signal intensity and present frame right channel sound
The size of the ratio between number intensity and previous frame right channel sound signal strength, can determine that sound source situation of change in the horizontal direction.
Fig. 6 is that the embodiment of the present invention according to the horizontal position coordinate that previous frame voice signal corresponds to sound source determines present frame sound
Sound signal corresponds to the horizontal position coordinate method flow diagram of sound source.Such as Fig. 6, determined according to the horizontal position coordinate of previous frame sound source
The horizontal position coordinate of present frame sound source includes the following steps.
S10511：The ratio between present frame L channel sound signal intensity and previous frame L channel sound signal intensity are calculated, with
And calculate the ratio between present frame L channel sound signal intensity and previous frame L channel sound signal intensity.
The similar aforementioned explanation to present frame sound signal intensity, present frame L channel sound signal intensity refer to currently
The energy of frame L channel voice signal, present frame right channel sound signal strength refer to the energy of present frame right channel sound signal
Amount.
S10512:Whether judge the ratio between present frame L channel sound signal intensity and previous frame L channel sound signal intensity
Greater than the ratio between present frame right channel sound signal strength and previous frame right channel sound signal strength；If so, executing S10513；
If it is not, then executing S10517.
S10513：Increase by the second count value；Then execute S10514.
S10514：Judge whether the second count value is greater than or equal to the second upper limit threshold；If so, executing S10515；If
It is no, then execute S10516.
S10515：Then make previous frame voice signal correspond to the numerical value obtained after the horizontal position coordinate increase of sound source and be used as to work as
Previous frame voice signal corresponds to the horizontal position coordinate of sound source, and the second count value is made to be initialized as second value.
S10516：Previous frame voice signal is corresponded into the horizontal position coordinate of sound source as present frame voice signal at the sound
The horizontal position coordinate in source.
S10517：Whether judge the ratio between present frame L channel sound signal intensity and previous frame L channel sound signal intensity
Less than the ratio between present frame right channel sound signal strength and previous frame right channel sound signal strength；If so, executing S10518；
If it is not, then executing S10516.
S10518：Reduce the second count value；Then execute S10519.
S10519：Judge whether the second count value is less than or equal to the second lower threshold；If so, executing S10520；If
It is no, then execute S10516.
S10520：The numerical value obtained after reducing the horizontal position coordinate of the corresponding sound source of previous frame voice signal, which is used as, works as
Previous frame voice signal corresponds to the horizontal position coordinate of sound source, and the second count value is made to be initialized as second value.
In S10515, it is assumed that the horizontal position coordinate that previous frame voice signal corresponds to sound source is x, then makes previous frame sound
It can be x that the horizontal position coordinate that signal corresponds to sound source, which increases to obtain present frame target voice to correspond to the horizontal position coordinate of sound source,
+1；Corresponding, in S10520, the horizontal position coordinate for making previous frame target voice correspond to sound source reduces to obtain present frame sound
The horizontal position coordinate that sound object corresponds to sound source can be x-1.
In the present embodiment, the numberical range of the second upper limit threshold can be [1,1000], the numberical range of the second lower threshold
Can be [- 1, -1000].For prevent that the horizontal position coordinate of sound source is suddenly big or suddenly small and when causing follow-up play acoustic distance sense it is past
Complex wave is dynamic, while so that sound source position is had and largely changing, and preferably sets the second upper limit threshold in the present embodiment
5, -5 are set by the second lower threshold.
In addition, in actual scene, it, can also be directly according to L channel voice signal energy to form virtual three-dimensional sound effective value
Directly determine whether sound source moves in the horizontal direction with the difference of right channel sound signal energy intensity, therefore S10512 can also be more
It is changed to compare whether present frame left channel signals intensity is greater than present frame right-channel signals intensity.
It should be noted that the position coordinates of sound source described in the present embodiment include that vertical position coordinate and horizontal position are sat
Mark, in other embodiments can also only one of vertical position coordinate and horizontal position coordinate.Determining present frame sound
After signal corresponds to the position coordinates of sound source, i.e., executable step S106-S108.
S106：Corresponding HRTF filter function is selected according to the corresponding position coordinates of present frame voice signal.
S107：Present frame left channel signals, which are filtered, according to HRTF filter function obtains L channel trap signal, and, according to
HRTF filter function filtering present frame right-channel signals obtain right channel trap signal.
HRTF filter function is the frequency domain acoustic transmission function under free-field condition from sound source to ears, is demonstrated by human body
Physiological structure acts on the integrated filter of sound wave.Different location coordinate has different HRTF filter functions, therefore uses certain
It is right that the HRTF filter function of one position coordinates handles L channel trap signal, processing present frame that present frame left channel signals obtain
The present frame right channel trap signal that sound channel signal obtains has the information for representing sound source position.Formula one is HRTF filter function
Equation.
Wherein, PLAnd PRIt is the complex frequency domain acoustic pressure that point sound source generates at the eardrum of the left and right ear of hearer respectively；P0It is to listen
Person's head removes rear point sound source in the acoustic pressure of original head center position；R be sound source to the distance on head, θ be sound source position side
Sound source position direction elevation angle when parallactic angle, φ, f frequency function.Based on practical experience, for far field r > 1.2m the case where, HLWith
HRIt is substantially unrelated with sound source distance r.
S108：L channel trap signal is sent to left speaker, and, right channel trap signal is sent to right loudspeaking
Device.
After playing L channel trap signal, right loudspeaker broadcasting right channel trap signal using left speaker, user's listens
After feel system is to corresponding signal processing, the feeling of sound source position variation can be experienced.
The virtual surround sound playback method provided in the embodiment of the present invention may also include step in addition to including above step
S109。
S109：Antialiasing handles L channel trap signal and right channel trap signal.
For the playback equipment using earplug or headset as loudspeaker, because of the sound that left speaker and right loudspeaker play
Sound is directly entered corresponding human ear, between each other will not crosstalk, so can not to L channel trap signal and right channel filtering letter
Number carry out antialiasing processing.And for playback equipments such as television sets, the sound that left speaker and right loudspeaker play can by with
The left and right ear at family is experienced, therefore can lead to the problem of acoustic crosstalk；For such equipment, needs to filter L channel and believe
Number and right channel trap signal carry out antialiasing processing, the sound that the left speaker that experiences the left ear of user only plays is right
Ear only experiences the sound that right loudspeaker plays.The essence of antialiasing processing is by the addition in L channel trap signal and right sound
The signal of road trap signal opposite in phase adds and the letter of L channel trap signal opposite in phase in right channel trap signal
Number；Specific antialiasing processing method can be found in existing document, also not be unfolded to state herein.After antialiasing processing, L channel mistake
Filter signal, which can be transmitted to left speaker, right channel trap signal, can be transmitted to right loudspeaker.
The specific implementation process of virtual surround sound playback method provided in an embodiment of the present invention is explained above.It can think
It arrives, using virtual surround sound playback method provided in an embodiment of the present invention, if the sound go of a certain type is for a period of time,
It can be compared by the intensity of sound of consecutive frame sound in this period of time, determine that the relative position in different frame of virtual sound source is sat
Mark, further according to the corresponding HRTF filter function of virtual sound source relative position coordinates to left channel signals and right-channel signals at
The obtained L channel trap signal and right channel trap signal with position characteristic is managed, left speaker plays L channel filtering letter
Number obtained sound, right loudspeaker, which play after the sound that right channel trap signal obtains is applied to user, family can be used to experience sound
The feeling of the opposite variation in source position, that is, produce true virtual echo effection.
In addition to providing virtual surround sound playback method above-mentioned, the present invention also provides a kind of realization aforementioned virtual surround sounds to broadcast
Put the virtual surround sound playing device 1 of method.Fig. 7 is virtual 1 schematic diagram of surround sound playing device provided in an embodiment of the present invention.
Such as Fig. 7, virtual surround sound playing device 1 includes filter 11, memory 12, communication interface 13 and communication bus 14；Wherein cross
It is connected between filter 11, memory 12 and communication interface 13 by communication bus 14.Communication interface 13 is for sending and receiving letter
Number, it specifically includes and receives present frame left channel signals and present frame right-channel signals, sends L channel trap signal and right channel
Trap signal.Memory 12 is used to store the program code for realizing aforementioned virtual surround sound playback method.Filter 11 is for reading
The program code stored in storage is taken, executes virtual surround sound playback method above-mentioned according to program code.
In addition, the embodiment of the present invention also provides a kind of virtual surround sound playback equipment.Fig. 8 is provided in an embodiment of the present invention
Virtual surround sound playback equipment schematic diagram.Such as Fig. 8, virtual surround sound playback equipment provided in an embodiment of the present invention includes left loudspeaking
Device 2, right loudspeaker 3 and virtual surround sound playing device 1 above-mentioned.In actual use, left speaker 2 and right loudspeaker 3 can be with
For earplug or earphone, antialiasing processing step is can be performed in virtual surround sound playing device 1 in this case；Certainly, left loudspeaking
Device 2 and right loudspeaker 3 can also be the loudspeaker of external, and the relative position of two loudspeakers should be according to aforementioned virtual ring at this time
The various parameters being arranged in sound playback method determine, to reach corresponding virtual echo effection.
Virtual surround sound playback method, playing device and the playback equipment in the embodiment of the present invention have been carried out in detail above
It introduces.Using specific embodiment, principle and implementation of the present invention are described for this part, the explanation of above embodiments
It is merely used to help understand the core idea of the present invention, without departing from the principles of the present invention, this field commonly counts people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Claims (10)
1. a kind of virtual surround sound playback method, which is characterized in that including：
Receive present frame left channel signals and present frame right-channel signals；
The type of present frame voice signal is determined according to present frame left channel signals and present frame right-channel signals；
Whether the type for judging present frame voice signal is identical as the type of previous frame voice signal；
If they are the same, then determine that present frame voice signal corresponds to sound source according to the position coordinates that previous frame voice signal corresponds to sound source
Position coordinates；If it is different, then corresponding to the position coordinates of sound source using initial position co-ordinates as present frame voice signal；
Corresponding HRTF filter function is selected according to the position coordinates that present frame voice signal corresponds to sound source；
Present frame left channel signals, which are filtered, according to the HRTF filter function obtains L channel trap signal, and, according to described
HRTF filter function filtering present frame right-channel signals obtain right channel trap signal；
The L channel trap signal is sent to left speaker, and, the right channel trap signal is sent to right loudspeaking
Device.
2. the method according to claim 1, wherein corresponding to the position coordinates of sound source according to previous frame voice signal
Determine that present frame voice signal corresponds to the position coordinates of sound source and includes：
The intensity of present frame voice signal is calculated according to present frame left channel signals and present frame right-channel signals；
Judge whether the intensity of present frame voice signal is greater than the intensity of previous frame voice signal；
If so, increasing by the first count value；If the first count value is greater than or equal to the first upper limit threshold, make previous frame sound
The numerical value that the vertical position coordinate that signal corresponds to sound source obtains after increasing corresponds to the vertical position of sound source as present frame voice signal
Coordinate is set, and the first count value is made to be initialized as the first numerical value；If the first count value is less than the first upper limit threshold, by upper one
The vertical position coordinate that frame voice signal corresponds to sound source corresponds to the vertical position coordinate of sound source as present frame voice signal；
If it is not, then reducing the first count value；If the first count value is less than or equal to the first lower threshold, make previous frame sound
The numerical value that the vertical position coordinate that signal corresponds to sound source obtains after reducing corresponds to the vertical position of sound source as present frame voice signal
Coordinate is set, and the first count value is made to be initialized as the first numerical value；If the first count value is less than the first lower threshold, by upper one
The vertical position coordinate that frame voice signal corresponds to sound source corresponds to the vertical position coordinate of sound source as present frame voice signal；
Wherein, the first numerical value less than the first upper limit threshold but is greater than the first lower threshold.
3. method according to claim 1 or 2, which is characterized in that correspond to the position coordinates of sound source according to previous frame voice signal
Determine that present frame voice signal corresponds to the position coordinates of sound source and includes：
Judge whether the ratio between present frame L channel sound signal intensity and previous frame L channel sound signal intensity are greater than present frame
The ratio between right channel sound signal strength and previous frame right channel sound signal strength；
If so, increasing by the second count value；If the second count value is greater than or equal to the second upper limit threshold, make previous frame sound
The numerical value that the horizontal position coordinate that signal corresponds to sound source obtains after increasing corresponds to the horizontal position of sound source as present frame voice signal
Coordinate is set, and the second count value is made to be initialized as second value；If the second count value is less than the second upper limit threshold, by upper one
The horizontal position coordinate that frame voice signal corresponds to sound source corresponds to the horizontal position coordinate of sound source as present frame voice signal；
If it is not, then reducing the second count value；If the second count value is less than or equal to the second lower threshold, make previous frame sound
The numerical value that the horizontal position coordinate that signal corresponds to sound source obtains after reducing corresponds to the horizontal position of sound source as present frame voice signal
Coordinate is set, and the second count value is made to be initialized as second value；If the second count value makes one less than the second lower threshold
The horizontal position coordinate that frame voice signal corresponds to sound source corresponds to the horizontal position coordinate of sound source as present frame voice signal；
Wherein, second value less than the second upper limit threshold but is greater than the second lower threshold.
4. method according to claim 1 or 2, which is characterized in that correspond to the position coordinates of sound source according to previous frame voice signal
Determine that present frame voice signal corresponds to the position coordinates of sound source and includes：
Judge whether present frame L channel sound signal intensity is greater than present frame right channel sound signal strength and the right sound of previous frame
Road sound signal intensity；
If so, increasing by the second count value；If the second count value is greater than or equal to the second upper limit threshold, make previous frame sound
The numerical value that the horizontal position coordinate that signal corresponds to sound source obtains after increasing corresponds to the horizontal position of sound source as present frame voice signal
Coordinate is set, and the second count value is made to be initialized as second value；If the second count value is less than the second upper limit threshold, by upper one
The horizontal position coordinate that frame voice signal corresponds to sound source corresponds to the horizontal position coordinate of sound source as present frame voice signal；
If it is not, then reducing the second count value；If the second count value is less than or equal to the second lower threshold, make previous frame sound
The numerical value that the horizontal position coordinate that signal corresponds to sound source obtains after reducing corresponds to the horizontal position of sound source as present frame voice signal
Coordinate is set, and the second count value is made to be initialized as second value；If the second count value makes one less than the second lower threshold
The horizontal position coordinate that frame voice signal corresponds to sound source corresponds to the horizontal position coordinate of sound source as present frame voice signal；
Wherein, second value less than the second upper limit threshold but is greater than the second lower threshold.
5. the method according to claim 1, wherein being believed according to present frame left channel signals and present frame right channel
Number determine present frame voice signal type include：
Judge whether the intensity of present frame left channel signals is more than or equal to the intensity of present frame right-channel signals；
If so, selection present frame left channel signals determine the characteristic parameter sequence of present frame sound；If it is not, then selecting present frame
Right-channel signals determine the characteristic parameter sequence of present frame sound；
The characteristic parameter sequence of the corresponding simplified HMM algorithm filtering present frame voice signal of various sound types is respectively adopted, obtains
It is the probability of various sound types to hair present frame voice signal；
The corresponding sound type of maximum probability is determined as to the type of present frame voice signal.
6. the method according to claim 1, wherein being believed according to present frame left channel signals and present frame right channel
Number determine present frame voice signal type include：
It calculates present frame left channel signals and present frame right-channel signals corresponds to the average value of sampled point up-sampling value；
The characteristic parameter sequence of present frame sound is determined according to the average value of each sampled point up-sampling value；
The characteristic parameter sequence of the corresponding simplified HMM algorithm filtering present frame voice signal of various sound types is respectively adopted, obtains
It is the probability of various sound types to hair present frame voice signal；
The corresponding sound type of maximum probability is determined as to the type of present frame voice signal.
7. according to the method described in claim 6, it is characterized in that, being determined according to the average value of each sampled point up-sampling value current
The characteristic parameter sequence of frame sound is：
According to the MFCC argument sequence of the mean value calculation present frame sound of each sampled point up-sampling value；
Using the MFCC argument sequence as the characteristic parameter sequence of present frame sound.
8. the method according to claim 1, wherein L channel trap signal is sent to left speaker, and,
Before right channel trap signal is sent to right loudspeaker, further include：
Antialiasing handles L channel trap signal and right channel trap signal.
9. a kind of virtual surround sound playing device, it is characterised in that：
Including filter, memory and communication interface；
Filter, memory and communication interface are connected by communication bus；
Communication interface is for sending and receiving signal；
Memory is for storing program code；
Filter is used to read the program code of memory storage, and executes the virtual surround sound such as any one of claim 1-7
Playback method.
10. a kind of virtual surround sound playback equipment, it is characterised in that：Including left speaker, right loudspeaker and as claimed in claim 9
Virtual surround sound playing device.
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