CN106658345A - Virtual surround sound playing method, device and equipment - Google Patents
Virtual surround sound playing method, device and equipment Download PDFInfo
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- CN106658345A CN106658345A CN201611030589.5A CN201611030589A CN106658345A CN 106658345 A CN106658345 A CN 106658345A CN 201611030589 A CN201611030589 A CN 201611030589A CN 106658345 A CN106658345 A CN 106658345A
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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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- 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 invention provides a virtual surround sound playing method, playing device and playing equipment. The playing method comprises the steps that the type of the current frame of sound signal is determined; the position coordinates of a sound source corresponding to the current frame of sound signal are determined according to the type of the current sound signal and the type of the previous frame of sound signal; a corresponding HRTF filtering function is selected according to the position coordinates of the sound source corresponding to the current frame of sound signal; the current frame of left channel signal is filtered according to the HRTF filtering function so as to obtain a left channel filtering signal, and the current frame of right channel signal is filtered according to the HRTF filtering function so as to obtain a right channel filtering signal; and the left channel filtering signal is transmitted to a left speaker, and the right channel filtering signal is transmitted to a right speaker. The sound played by the left speaker and the right speaker affects the user and then the user is enabled to experience the feeling of relative change of the sound source position, i.e. the real virtual surround sound playing effect is generated.
Description
Counted fields
The present invention relates to acoustic processing play-back technology field, more particularly to a kind of virtual surround sound player method, it is another this
It is bright that a kind of playback equipment for realizing aforementioned virtual surround sound player method is also provided.
Background count
Virtual surround sound play-back technology is in two-channel Equipment Foundations, makes user experience sound from multiple orientation
Sound play-back technology.Along with the development that virtual reality is counted, at present virtual surround sound counting is in TV, virtual reality device
It is used widely.
Fig. 1 is a kind of virtual surround sound player method principle schematic in prior art.Such as Fig. 1, current main flow it is virtual
Surround sound player method adopts multiple HRTF (head related transfer function, Head Related Transfer Function) module
Respectively to left channel signals S of inputLWith right-channel signals SRIt is filtered.L channel after each HRTF modular filtration is filtered
Signal SLnewLeft speaker broadcasting, the R channel trap signal S after each HRTF modular filtration are sent to simultaneouslyRnewSend simultaneously
Play to right loudspeaker.
Using above-mentioned player method, because left channel signals and right-channel signals are by the process of multiple HRTF modular filtrations,
It is possible to making user experience sound is sent from multiple positions.But, such circular acoustic processing method is only capable of making user
Experience sound to send from multiple positions, can not user experience the sensation of sound generation source movement, that is, feel can not user
Experienced by real surround sound.
The content of the invention
Virtual surround sound player method can not produce real surround sound experience in solve the problems, such as this prior art, this
Invention provides a kind of new virtual surround sound player method；The another present invention is also provided and realizes aforementioned virtual surround sound player method
Playing device and playback equipment.
The present invention provides a kind of virtual surround sound player method, including：
Receive present frame left channel signals and present frame right-channel signals；
Determine the type of present frame voice signal according to present frame left channel signals and present frame right-channel signals；
Judge whether the type of present frame voice signal is identical with the type of previous frame voice signal；
If identical, determine present frame voice signal at the sound according to the position coordinates of previous frame voice signal correspondence sound source
The position coordinates in source；If it is different, then initial position co-ordinates are corresponded into the position coordinates of sound source as present frame voice signal；According to
The position coordinates of present frame voice signal correspondence sound source selects corresponding HRTF filter functions；
Present frame left channel signals are filtered according to the HRTF filter functions and obtains L channel trap signal, and, according to
The HRTF filter functions filter present frame right-channel signals and obtain R channel trap signal；
The L channel trap signal is sent to left speaker, and, the R channel trap signal is sent to the right side
Loudspeaker.
Optionally, present frame voice signal correspondence sound source is determined according to the position coordinates of previous frame voice signal correspondence 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；
Whether the intensity for judging present frame voice signal is more than the intensity of previous frame voice signal；
If so, increase then the first count value；If the first count value is more than or equal to the first upper limit threshold, previous frame is made
Numerical value the hanging down as present frame voice signal correspondence sound source obtained after the vertical position coordinate increase of voice signal correspondence sound source
Straight position coordinates, and make the first count value be initialized as the first numerical value；If the first count value is less than the first upper limit threshold, will
Vertical position coordinate of the vertical position coordinate of previous frame voice signal correspondence sound source as present frame voice signal correspondence sound source；
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, previous frame is made
Numerical value the hanging down as present frame voice signal correspondence sound source that the vertical position coordinate of voice signal correspondence sound source is obtained after reducing
Straight position coordinates, and make the first count value be initialized as the first numerical value；If the first count value is less than the first lower threshold, will
Vertical position coordinate of the vertical position coordinate of previous frame voice signal correspondence sound source as present frame voice signal correspondence sound source；
Wherein, the first numerical value is less than the first upper limit threshold but more than the first lower threshold.
Optionally, present frame voice signal correspondence sound source is determined according to the position coordinates of previous frame voice signal correspondence sound source
Position coordinates include：
Judge present frame L channel sound signal intensity is worked as with whether the ratio of previous frame L channel sound signal intensity is more than
The ratio of previous frame right channel sound signal strength signal intensity and previous frame right channel sound signal strength signal intensity；
If so, increase then the second count value；If the second count value is more than or equal to the second upper limit threshold, previous frame is made
Water of the numerical value obtained after the horizontal position coordinate increase of voice signal correspondence sound source as present frame voice signal correspondence sound source
Flat position coordinates, and make the second count value be initialized as second value；If the second count value is less than the second upper limit threshold, will
Horizontal position coordinate of the horizontal position coordinate of previous frame voice signal correspondence sound source as present frame voice signal correspondence sound source；
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, previous frame is made
Water of the numerical value that the horizontal position coordinate of voice signal correspondence sound source is obtained after reducing as present frame voice signal correspondence sound source
Flat position coordinates, and make the second count value be initialized as second value；If the second count value is less than the second lower threshold, make
Horizontal position coordinate of the horizontal position coordinate of previous frame voice signal correspondence sound source as present frame voice signal correspondence sound source；
Wherein, second value is less than the second upper limit threshold but more than the second lower threshold.
Optionally, present frame voice signal correspondence sound source is determined according to the position coordinates of previous frame voice signal correspondence sound source
Position coordinates includes：
Judge present frame L channel sound signal intensity whether more than present frame right channel sound signal strength signal intensity and previous frame
Right channel sound signal strength signal intensity；
If so, increase then the second count value；If the second count value is more than or equal to the second upper limit threshold, previous frame is made
Water of the numerical value obtained after the horizontal position coordinate increase of voice signal correspondence sound source as present frame voice signal correspondence sound source
Flat position coordinates, and make the second count value be initialized as second value；If the second count value is less than the second upper limit threshold, will
Horizontal position coordinate of the horizontal position coordinate of previous frame voice signal correspondence sound source as present frame voice signal correspondence sound source；
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, previous frame is made
Water of the numerical value that the horizontal position coordinate of voice signal correspondence sound source is obtained after reducing as present frame voice signal correspondence sound source
Flat position coordinates, and make the second count value be initialized as second value；If the second count value is less than the second lower threshold, make
Horizontal position coordinate of the horizontal position coordinate of previous frame voice signal correspondence sound source as present frame voice signal correspondence sound source；
Wherein, second value is less than the second upper limit threshold but more 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：
Whether the intensity for judging present frame left channel signals is more than or equal to the intensity of present frame right-channel signals；
If so, present frame left channel signals are then selected to determine the characteristic parameter sequence of present frame sound；If it is not, then selecting to work as
Previous frame right-channel signals determine the characteristic parameter sequence of present frame sound；
The characteristic parameter sequence that the corresponding simplified HMM algorithms of various sound types filter present frame voice signal is respectively adopted
Row, obtain sending out the probability that present frame voice signal is various sound types；
The corresponding sound type of maximum probability is defined as into 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：
Calculate the mean value of present frame left channel signals sampled point up-sampling value corresponding with present frame right-channel signals；
The characteristic parameter sequence of present frame sound is determined according to the mean value of each sampled point up-sampling value；
The characteristic parameter sequence that the corresponding simplified HMM algorithms of various sound types filter present frame voice signal is respectively adopted
Row, obtain sending out the probability that present frame voice signal is various sound types；
The corresponding sound type of maximum probability is defined as into the type of present frame voice signal.
Optionally, determine that the characteristic parameter sequence of present frame sound is according to the mean value of each sampled point up-sampling value：
According to the MFCC argument sequences of the mean value calculation present frame sound of each sampled point up-sampling value；
Using the MFCC argument sequences as present frame sound characteristic parameter sequence.
Optionally, L channel trap signal is sent to left speaker, and, R channel trap signal is sent to the right side and is raised
Before sound device, also include：
Antialiasing processes L channel trap signal and R channel trap signal.
The present invention also provides a kind of virtual surround sound playing device, including filter, memory and communication interface；
Filter, memory and communication interface are connected by communication bus；
Communication interface is used to receive and sending signal；
Memory is used for store program codes；
Filter is used to read the program code of memory storage, and performs 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 player method provided in an embodiment of the present invention, if during one section of the sound go of a certain type
Between, then by comparing the intensity of sound of consecutive frame sound in this period of time virtual sound source can be determined in the relative position of different frame
Put coordinate；Corresponding HRTF filter functions are may be selected according to virtual sound source relative position coordinates, letter is filtered using corresponding HRTF
It is several that left channel signals and right-channel signals are carried out to process L channel trap signal and the R channel that can obtain with position characteristic
Trap signal, left speaker play L channel trap signal obtain sound, right loudspeaker play R channel trap signal obtain
Sound be applied to after user user can be made to experience the sensation of the relative change of sound source position, that is, generate real virtual
Echo effection.
Description of the drawings
To be illustrated more clearly that the count protocol of background technology or the present invention, below to existing counting or specific embodiment
In the accompanying drawing that is used in combination be briefly described；It should be evident that below in conjunction with the accompanying drawing side of being only for of specific embodiment
Just understand the embodiment of the present invention, for the common counting personnel in this area, on the premise of not paying creative work, may be used also
To obtain other accompanying drawings according to these accompanying drawings；
Fig. 1 is a kind of virtual surround sound player method principle schematic in prior art；
Fig. 2 is virtual surround sound player method schematic diagram provided in an embodiment of the present invention；
Fig. 3 is the type flow figure of 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 player method of the embodiment of the present invention is used；
Fig. 5 is that the embodiment of the present invention determines present frame sound according to the corresponding sound source vertical position coordinate of previous frame voice signal
The vertical position coordinate method flow diagram of the corresponding sound source of message number；
Fig. 6 is that the embodiment of the present invention determines present frame sound according to the horizontal position coordinate of previous frame voice signal correspondence sound source
The horizontal position coordinate method flow diagram of message number correspondence 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 devices of 1-, 11- filters, 12- memories, 13- communication interfaces, 14- communications are total
Line, 2- left speakers, the right loudspeakers of 3-.
Specific embodiment
The present invention provides a kind of Virtual Sound around player method, playing device and playback equipment, can be according to left channel signals
With the position coordinates that right-channel signals determine sound source, and corresponding HRTF filter functions are selected to a left side according to the position coordinates of sound source
Sound channel signal and right-channel signals are filtered process, obtain corresponding L channel trap signal and R channel trap signal.It is left
Sound channel trap signal and R channel trap signal can make user experience the relative position change of sound source after playing, that is, use
Experience virtual surround sound experience in family.
In order that the personnel of this counted fields more fully understand the technical scheme in the present invention, below in conjunction with of the invention real
The accompanying 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 enforcement
Example is only a part of embodiment of the invention, rather than the embodiment of whole.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under the premise of creative work is not made, should all belong to protection of the present invention
Scope.
It should be noted that following virtual surround sound player methods are to realize that playback equipment should based on certain playback equipment
It is the playback equipment at least with left speaker and right loudspeaker.In practical application, playback equipment can be the class of television set one
Playing audio/video, or the only stereo set of broadcasting sound.In addition, to meet real virtual surrounding sound effect,
Left speaker and right loudspeaker should be arranged on the position of the following method parameters of correspondence.
Fig. 2 is virtual surround sound player method schematic diagram provided in an embodiment of the present invention.Such as Fig. 2, what the present embodiment was provided
Virtual surround sound player method is comprised the following steps.
S101：Receive present frame left channel signals and present frame right-channel signals.
S102：Determine the type of present frame voice signal according to present frame left channel signals and present frame right-channel signals.
Fig. 3 is the type flow figure of the voice signal that the embodiment of the present invention determines present frame.Such as Fig. 3, in the present embodiment,
In S102 according to present frame left channel signals and present frame right-channel signals determine the type of the voice signal of present frame include with
Lower sub-step.
S1021：Calculate the average of present frame left channel signals sampled point up-sampling value corresponding with present frame right-channel signals
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 is constituted, and the sampled value of sampled point arranges to form certain types of sound sequentially in time.Because present frame L channel is believed
Number and the sound source that is under same environment scene of present frame right-channel signals send, so present frame left channel signals and present frame
The sampled value of correspondence sampled point has the probability of positive correlation very big in right-channel signals, therefore can be believed by present frame L channel
The mean value of number sampled point up-sampling value corresponding with present frame right-channel signals, and by the mean value of each sampled point up-sampling value
Arrangement sequentially in time is formed and represents the voice signal that present frame sound source sends.
The mean value that sampled point up-sampling value is asked in S1021 is to determine a present frame voice signal (present frame left side for follow-up
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 by the sampled point sampled value of present frame left channel signals sequentially in time
The arrangement sequentially in time of the sampled point sampled value of arrangement or present frame right-channel signals) as determination present frame voice signal
The foundation of type；For example, can be selected wherein by comparing present frame left channel signals intensity and present frame right-channel signals intensity
The type of a larger determination voice signal of intensity.
S1022：The characteristic parameter sequence of present frame sound is determined according to the mean value of each sampled point up-sampling value.
The each sampled point sampled value of the aforementioned present frame for obtaining is only through the voice signal that temporal signatures represent present frame, and
The type of voice signal could be recognized by the frequency domain character of sound, therefore also need to be sampled according to each in the embodiment of the present invention
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 mean 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 parameters are in falling that Mel scale frequency domain extracts
Frequency spectrum parameter, meets the auditory properties of human ear, therefore can be more accurate as the characteristic parameter of present frame voice signal with it
The auditory properties of simulation human ear.The specific computational methods of MFCC parameters refer to existing document in prior art, and here is no longer
Launch statement.
In other embodiments, except can adopt MFCC argument sequences as present frame voice signal characteristic parameter sequence
Outward, can also be joined using LPCC (Linear Prediction cepstrum coefficient, linear prediction scramble spectral function)
Characteristic parameter sequence of the Number Sequence as present frame voice signal.
S1023：The feature that the corresponding simplified HMM algorithms of various sound types filter present frame voice signal is respectively adopted
Argument sequence, obtains the probability that present frame voice signal is various sound types.
HMM model (Hidden Markov Model, HMM) is a kind of widely used probability statistics system
Meter model, its available five-tuple { N, M, π, A, B } represents, wherein A is the transfer matrix of the hidden state of HMM model, B is HMM
The confusion matrix of model, π are initial shape probability of state, and N is input of the aforementioned known characteristic parameter sequence as model, M
For the probability that present frame voice signal is HMM model correspondence sound type.
The corresponding HMM model of aforementioned various sound types is joined by the MFCC features of the various voice signals of known same type
Number Sequence training is obtained as input, for example, obtain representing the HMM of voice by the MFCC characteristic parameter sequences of a variety of voice
Model.During concrete operation, first initial estimation can be carried out to the parameter { π, A, B } of HMM model, then be calculated using forward-backward algorithm
Method, efficiency assessment and amendment using the MFCC characteristic sequences of same type voice signal to initial estimation parameter, optimize mould
Shape parameter must reach setting accuracy.Specific computational methods refer to existing document, here also not reinflated narration.Should note
Meaning, the identification for carrying out sound type using HMM model is only a kind of alternative of the present invention, in other embodiments of the invention
In, may also be employed other known Mathematical Modeling simulated sound types identification process, judge voice signal type.
S1024：The corresponding sound type of maximum probability is defined as into the type of present frame voice signal.
If present frame voice signal is the sound type of a certain determination, using the corresponding HMM model of this sound type
After processing the characteristic parameter sequence of present frame voice signal, the probability for obtaining should be maximum.It is counter to push away, if it is known that each HMM mould
Obtain after corresponding probability after the characteristic parameter sequence of type process present frame voice signal, can be by the corresponding sound of wherein maximum probability
Sound type is defined as the type of present frame voice signal.
After the completion of S102 is performed, S103 and corresponding subsequent step can be sequentially carried out.
For the ease of understanding the particular content of the present embodiment, the sound field coordinate determined in the present embodiment is simply introduced first
System.Described sound field refers to the two dimensional field space for determining in the plane in the present embodiment.Fig. 4 is embodiment of the present invention virtual ring
Around the sound field coordinate system schematic diagram that sound player method is used；Such as Fig. 4, in the present embodiment, with left speaker in playback equipment and
Right loudspeaker line as sound field horizontal axis, using the midpoint of left speaker and right loudspeaker as origin of coordinates O, with mistake
Origin of coordinates O and perpendicular to two loudspeaker lines straight line as sound field vertical coordinate axle；Raised to a left side by right loudspeaker
Sound device, the coordinate of horizontal axis gradually increases；By playback equipment to user, the coordinate of vertical coordinate axle increases.
Using aforesaid sound field coordinate system, the position coordinates of sound source includes horizontal position coordinate and vertical position coordinate.
According to practical experience, the sound that sound source sends is respectively provided with certain continuation, and the sound that different sound sources send
Between generally individually have more seamlessly transit.Accordingly, playback equipment play sound when, if the type of present frame sound source and
The type of previous frame sound source is identical, then sound source is the Probability maximum of same sound source in two frames.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 sent by same sound source；And if present frame sound source
Type it is different with the type of previous frame sound source, then can determine that two frame voice signals are sent by different sound sources.
If present frame voice signal and previous frame voice signal are sent by same sound source, can be believed according to previous frame sound
Number correspondence sound source position coordinates determine present frame voice signal correspondence sound source position coordinates；And if present frame voice signal
Type it is different with the type of previous frame voice signal, then judge that the corresponding sound source of previous frame voice signal has been lost, and is
Prevent from determining the position coordinates of present frame voice signal again on the basis of the corresponding sound source position coordinate of previous frame voice signal
Cause the sense of hearing puzzlement, can using initial position co-ordinates as the corresponding sound source of present frame voice signal position coordinates.
S103：Judge whether the type of present frame voice signal is identical with the type of previous frame voice signal；If identical,
Perform S104；If it is different, then performing S105.
According to actually used experience, playback equipment is played during sound, and sound has certain contents attribute (all
Such as tone color, vibration frequency), user can judge type (the namely class of voice signal of sound according to the contents attribute of sound
Type).For example, sound is judged into 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 sends.
S104：The position coordinates of present frame sound source is determined according to the position coordinates of previous frame sound source；Subsequently perform S106.
S105：Using initial coordinate as present frame sound source position coordinates；Subsequently perform S106.
According to the sound field coordinate system set up, the position coordinates of sound source includes horizontal position coordinate and vertical position coordinate；
In the case of present frame voice signal type and previous frame voice signal type identical, according to the corresponding sound of previous frame voice signal
The position coordinates in source determines that the position coordinates of the corresponding sound source of present frame voice signal is included according to previous frame voice signal correspondence
The vertical position coordinate of sound source determine the vertical position coordinate of the corresponding sound source of present frame voice signal.
It can be seen from the experience of life：If near user (the generation intensity for assuming sound source does not change), user listens sound source
The intensity of sound for arriving can be increasing；And if sound source is away from user, then the intensity of sound that user hears can be less and less.Cause
This, just can determine that sound source in vertical direction by the intensity of the intensity and previous frame voice signal that compare present frame voice signal
Situation of change.
Fig. 5 is that the embodiment of the present invention determines present frame sound according to the corresponding sound source vertical position coordinate of previous frame voice signal
The vertical position coordinate method flow diagram of the corresponding sound source of message number.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 is comprised 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 Calculation, present frame
The intensity of voice signal can be all sampled point energy sums, or present frame voice signal in present frame voice signal
In all sampled point energy mean value.
In one embodiment, the intensity of sound and present frame right-channel signals of present frame left channel signals can respectively be calculated
Intensity of sound, the intensity of sound for then making present frame left channel signals is added with the intensity of sound of present frame right-channel signals and obtains
Present frame intensity of sound.
In another embodiment, also can calculate on present frame left channel signals sampled point corresponding with present frame right-channel signals
Sampled value mean value, determine the intensity of present frame voice signal further according to the sampled value average of each sampled point.
S1052：Judge whether present frame sound signal intensity is more than the intensity of previous frame voice signal；If so, then perform
S1053；If it is not, then performing S1057；
S1053：Increase by the first count value；Subsequently perform S1054.
S1054：Judge the first count value whether more than or equal to the first upper limit threshold；If so, S1055 is then performed；If it is not,
Then perform S1056.
S1055：The numerical value that the vertical position coordinate increase of previous frame voice signal correspondence sound source is obtained is made as present frame
The vertical position coordinate of voice signal correspondence sound source, and make the first count value be initialized as the first numerical value.
S1056：Using previous frame voice signal correspondence sound source vertical position coordinate as present frame voice signal at the sound
The vertical position coordinate in source.
S1057：Whether the intensity for judging present frame voice signal is less than the intensity of previous frame voice signal；If so, then hold
Row S1058；If it is not, then performing S1056.
S1058：Reduce the first count value；Subsequently perform S1059.
S1059：Judge the first count value whether less than or equal to the first lower threshold；If so, S10510 is then performed；If
It is no, then perform S1056.
S10510：The numerical value that the corresponding sound source vertical position coordinate of previous frame voice signal is obtained after reducing is made as current
The corresponding sound source vertical position coordinate of frame voice signal, and make the first count value be initialized as the first numerical value.
In S1055, it is assumed that the vertical position coordinate of previous frame voice signal correspondence sound source is y, then make the vertical of sound source
It is y+1 that position increase obtains the vertical position coordinate of present frame voice signal correspondence sound source；Corresponding, in S10510, make
The vertical position coordinate reduction of previous frame sound-source signal correspondence sound source obtains the corresponding sound source upright position of present frame voice signal
Coordinate can be y-1.
In the present embodiment, the number range of the first upper limit threshold can be [1,1000], the number range of the first lower threshold
Can be [- 1, -1000], the span of corresponding first numerical value can for (- 999,999).It is big to prevent vertical position coordinate from neglecting
Suddenly little and acoustic distance sense when causing follow-up play reciprocal fluctuation, while and ensureing that sound source position can have and largely becoming
Change, preferably the first upper limit threshold is set into 10 in the present embodiment, the first lower threshold is set into -10.
It is contemplated that if the first upper limit threshold is set to 10, the first lower threshold is set to -10, in the strong of voice signal
In the case of degree sequentially increases or sequentially reduces, the position coordinates of voice signal correspondence virtual sound source just can change after 10 frames.
In other embodiments, if the first upper limit threshold is set to 1, the first lower threshold is set to -1, then in present frame sound source
When intensity of sound is different from the intensity of sound of previous frame sound source, sound source position can change.In practical application, such as big gun
The translational speed of the sound sources such as bullet, aircraft quickly, therefore can be by under first upper limit threshold and first of the type of such voice signal
Limit threshold value arranges less；And the translational speed very little of the sound source such as personnel, machine, therefore can be by the type of such voice signal
The first upper limit threshold and the first lower threshold arrange it is larger.
It should be noted herein that in other embodiments, present frame sound signal intensity and previous frame sound also can only be compared
Signal strength signal intensity size, determines whether to adjust the position of virtual sound source, and does not carry out counting statistics.
According to real life experience：If sound source side shifting to the left, present frame L channel sound signal intensity and upper
The ratio of frame L channel sound signal intensity is strong with previous frame right channel sound signal more than present frame right channel sound signal strength signal intensity
The ratio of degree,；If sound source side shifting to the right, present frame L channel sound signal intensity is strong with previous frame L channel voice signal
The ratio of degree is less than present frame right channel sound signal strength signal intensity and the ratio of previous frame right channel sound signal strength signal intensity.Therefore, by than
Compared with present frame L channel sound signal intensity and the ratio and present frame right channel sound letter of previous frame L channel sound signal intensity
Number intensity and the size of the ratio of previous frame right channel sound signal strength signal intensity, can determine that sound source situation of change in the horizontal direction.
Fig. 6 is that the embodiment of the present invention determines present frame sound according to the horizontal position coordinate of previous frame voice signal correspondence sound source
The horizontal position coordinate method flow diagram of message number correspondence 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 is comprised the following steps.
S10511：The ratio of present frame L channel sound signal intensity and previous frame L channel sound signal intensity is calculated, with
And, calculate the ratio of present frame L channel sound signal intensity and previous frame L channel sound signal intensity.
The aforementioned explanation to present frame sound signal intensity is similar to, present frame L channel sound signal intensity is referred to currently
The energy of frame L channel voice signal, present frame right channel sound signal strength signal intensity refers to the energy of present frame right channel sound signal
Amount.
S10512:Whether judge the ratio of present frame L channel sound signal intensity and previous frame L channel sound signal intensity
More than present frame right channel sound signal strength signal intensity and the ratio of previous frame right channel sound signal strength signal intensity；If so, S10513 is then performed；
If it is not, then performing S10517.
S10513：Increase by the second count value；Subsequently perform S10514.
S10514：Judge the second count value whether more than or equal to the second upper limit threshold；If so, S10515 is then performed；If
It is no, then perform S10516.
S10515：The numerical value that obtains then is made after the horizontal position coordinate increase of previous frame voice signal correspondence sound source as working as
The horizontal position coordinate of previous frame voice signal correspondence sound source, and make the second count value be initialized as second value.
S10516：Using previous frame voice signal correspondence sound source horizontal position coordinate as present frame voice signal at the sound
The horizontal position coordinate in source.
S10517：Whether judge the ratio of present frame L channel sound signal intensity and previous frame L channel sound signal intensity
Less than present frame right channel sound signal strength signal intensity and the ratio of previous frame right channel sound signal strength signal intensity；If so, S10518 is then performed；
If it is not, then performing S10516.
S10518：Reduce the second count value；Subsequently perform S10519.
S10519：Judge the second count value whether less than or equal to the second lower threshold；If so, S10520 is then performed；If
It is no, then perform S10516.
S10520：The numerical value that obtains is used as working as after reducing the horizontal position coordinate of the corresponding sound source of previous frame voice signal
The horizontal position coordinate of previous frame voice signal correspondence sound source, and make the second count value be initialized as second value.
In S10515, it is assumed that the horizontal position coordinate of previous frame voice signal correspondence sound source is x, then make previous frame sound
It can be x that the horizontal position coordinate increase of signal correspondence sound source obtains the horizontal position coordinate of present frame target voice correspondence sound source
+1；Corresponding, in S10520, the horizontal position coordinate reduction for making previous frame target voice correspondence sound source obtains present frame sound
The horizontal position coordinate of sound object correspondence sound source can be x-1.
In the present embodiment, the number range of the second upper limit threshold can be [1,1000], the number range of the second lower threshold
Can be [- 1, -1000].Acoustic distance sense is past when causing follow-up play to prevent the horizontal position coordinate of sound source suddenly big or suddenly small
Complex wave is moved, while sound source position is had largely changing, is preferably set to the second upper limit threshold in the present embodiment
5th, the second lower threshold is set into -5.
Additionally, be to form virtual three-dimensional sound effective value in actual scene, also can directly according to L channel voice signal energy
Directly determine that whether sound source moves in the horizontal direction, therefore S10512 also can be more with the difference of right channel sound signal energy intensity
Whether it is changed to compare present frame left channel signals intensity more than present frame right-channel signals intensity.
It should be noted that the position coordinates of sound source described in the present embodiment includes that vertical position coordinate and horizontal level are sat
Mark, one kind that in other embodiments also can be only and in vertical position coordinate and horizontal position coordinate.It is determined that present frame sound
After the position coordinates of signal correspondence sound source, you can execution step S106-S108.
S106：Corresponding HRTF filter functions are selected according to the corresponding position coordinates of present frame voice signal.
S107：Present frame left channel signals are filtered according to HRTF filter functions and obtains L channel trap signal, and, according to
HRTF filter functions filter present frame right-channel signals and obtain R channel trap signal.
HRTF filter functions are the frequency domain acoustic transmission function under free-field condition from sound source to ears, and it is demonstrated by human body
Physiological structure is acted on the integrated filter of sound wave.Diverse location coordinate has different HRTF filter functions, therefore adopts certain
The HRTF filter functions of one position coordinates process L channel trap signal, the process present frame right side that present frame left channel signals are obtained
The present frame R channel trap signal that sound channel signal is obtained has the information for representing sound source position.Formula one is HRTF filter functions
Equation.
Wherein, PLAnd PRIt is respectively complex frequency domain acoustic pressure that point sound source is produced at the eardrum of the left and right ear of hearer；P0It is to listen
Person's head removes acoustic pressure of the rear point sound source in original head center position；R be sound source to the distance of head, θ be sound source position side
The sound source position direction elevation angle, the function of f frequencies when parallactic angle, φ.According to practical experience, during for far field r ＞ 1.2m, HLWith
HRIt is substantially unrelated apart from r with sound source.
S108：L channel trap signal is sent to left speaker, and, R channel trap signal is sent to the right side and is raised one's voice
Device.
L channel trap signal, right loudspeaker are played using left speaker to play after R channel trap signal, user's listens
After feel system is to corresponding signal transacting, the sensation of sound source position change can be experienced.
The virtual surround sound player method provided in the embodiment of the present invention may also include step in addition to including above step
S109。
S109：Antialiasing processes L channel trap signal and R channel trap signal.
For using earplug or headset as loudspeaker playback equipment because the sound that left speaker and right loudspeaker are played
Sound is directly entered corresponding human ear, each other will not crosstalk, so letter can not be filtered to L channel trap signal and R channel
Number carry out antialiasing process.And for playback equipments such as television sets, the sound that left speaker and right loudspeaker are played can by with
The left and right ear at family is experienced, therefore can produce the problem of acoustic crosstalk；For this kind equipment, need to filter L channel and believe
Number and R channel trap signal carry out antialiasing process, the sound for playing the left speaker that the left ear of user only experiences is right
Ear only experiences the sound that right loudspeaker is played.The essence of antialiasing process is will to add in L channel trap signal and right sound
The signal of road trap signal opposite in phase, in R channel trap signal addition and the letter of L channel trap signal opposite in phase
Number；Specific antialiasing processing method can be found in existing document, and here does not launch statement yet.After antialiasing process, L channel mistake
Filter signal can send to left speaker, R channel trap signal and can send to right loudspeaker.
The process that implements of virtual surround sound player method provided in an embodiment of the present invention is explained above.Can think
Arrive, using virtual surround sound player method provided in an embodiment of the present invention, if the sound go of a certain type is for a period of time,
Can be compared by the intensity of sound of consecutive frame sound in this period of time, the relative position in different frame for determining virtual sound source is sat
Mark, further according to the corresponding HRTF filter functions of virtual sound source relative position coordinates to left channel signals and right-channel signals at
The L channel trap signal with position characteristic and R channel trap signal that reason is obtained, left speaker plays L channel and filters letter
Number sound for obtaining, right loudspeaker are played the sound that R channel trap signal obtains and are applied to after user and user can be made to experience sound
The sensation of the relative change in source position, that is, generate real virtual echo effection.
In addition to aforesaid virtual surround sound player method is provided, the present invention also provides one kind and realizes that aforementioned virtual surround sound is broadcast
Put the virtual surround sound playing device 1 of method.Fig. 7 is the virtual schematic diagram of surround sound playing device 1 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
Connected by communication bus 14 between filter 11, memory 12 and communication interface 13.Communication interface 13 is used to receiving and sending letter
Number, specifically include reception present frame left channel signals and present frame right-channel signals, send L channel trap signal and R channel
Trap signal.Memory 12 is used for the program code that aforementioned virtual surround sound player method is realized in storage.Filter 11 is used to read
The program code stored in storage is taken, according to program code aforesaid virtual surround sound player method is performed.
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 is raised one's voice including a left side
Device 2, right loudspeaker 3 and aforesaid virtual surround sound playing device 1.In actually used, left speaker 2 and right loudspeaker 3 can be with
For earplug or earphone, in this case virtual surround sound playing device 1 can perform antialiasing process step；Certainly, a left side is raised one's voice
Device 2 and right loudspeaker 3 are alternatively the loudspeaker of external, and now the relative position of two loudspeakers should be according to aforementioned virtual ring
The various parameters arranged in sound player method determine, to reach corresponding virtual echo effection.
Above to the embodiment of the present invention in virtual surround sound player method, playing device and playback equipment carried out in detail
Introduce.This part is set forth using specific embodiment to the principle and embodiment of the present invention, the explanation of above example
The core concept for helping understand the present invention is only intended to, without departing from the principles of the present invention, this area commonly counts people
The every other embodiment that member is obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Claims (10)
1. a kind of virtual surround sound player method, it is characterised in that include：
Receive present frame left channel signals and present frame right-channel signals；
Determine the type of present frame voice signal according to present frame left channel signals and present frame right-channel signals；
Judge whether the type of present frame voice signal is identical with the type of previous frame voice signal；
If identical, present frame voice signal correspondence sound source is determined according to the position coordinates of previous frame voice signal correspondence sound source
Position coordinates；If it is different, then initial position co-ordinates are corresponded into the position coordinates of sound source as present frame voice signal；
Corresponding HRTF filter functions are selected according to the position coordinates of present frame voice signal correspondence sound source；
Present frame left channel signals are filtered according to the HRTF filter functions and obtains L channel trap signal, and, according to described
HRTF filter functions filter present frame right-channel signals and obtain R channel trap signal；
The L channel trap signal is sent to left speaker, and, the R channel trap signal is sent to the right side and is raised one's voice
Device.
2. method according to claim 1, it is characterised in that according to the position coordinates of previous frame voice signal correspondence sound source
Determining the position coordinates of present frame voice signal correspondence sound source includes：
The intensity of present frame voice signal is calculated according to present frame left channel signals and present frame right-channel signals；
Whether the intensity for judging present frame voice signal is more than the intensity of previous frame voice signal；
If so, increase then the first count value；If the first count value is more than or equal to the first upper limit threshold, previous frame sound is made
Vertical position of the numerical value obtained after the vertical position coordinate increase of signal correspondence sound source as present frame voice signal correspondence sound source
Coordinate is put, and makes the first count value be initialized as the first numerical value；If the first count value is less than the first upper limit threshold, by upper one
Vertical position coordinate of the vertical position coordinate of frame voice signal correspondence sound source as present frame voice signal correspondence sound source；
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, previous frame sound is made
Vertical position of the numerical value that the vertical position coordinate of signal correspondence sound source is obtained after reducing as present frame voice signal correspondence sound source
Coordinate is put, and makes the first count value be initialized as the first numerical value；If the first count value is less than the first lower threshold, by upper one
Vertical position coordinate of the vertical position coordinate of frame voice signal correspondence sound source as present frame voice signal correspondence sound source；
Wherein, the first numerical value is less than the first upper limit threshold but more than the first lower threshold.
3. according to the method for claim 1 or 2, it is characterised in that according to the position coordinates of previous frame voice signal correspondence sound source
Determining the position coordinates of present frame voice signal correspondence sound source includes：
Judge present frame L channel sound signal intensity with the ratio of previous frame L channel sound signal intensity whether more than present frame
The ratio of right channel sound signal strength signal intensity and previous frame right channel sound signal strength signal intensity；
If so, increase then the second count value；If the second count value is more than or equal to the second upper limit threshold, previous frame sound is made
Horizontal position of the numerical value obtained after the horizontal position coordinate increase of signal correspondence sound source as present frame voice signal correspondence sound source
Coordinate is put, and makes the second count value be initialized as second value；If the second count value is less than the second upper limit threshold, by upper one
Horizontal position coordinate of the horizontal position coordinate of frame voice signal correspondence sound source as present frame voice signal correspondence sound source；
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, previous frame sound is made
Horizontal position of the numerical value that the horizontal position coordinate of signal correspondence sound source is obtained after reducing as present frame voice signal correspondence sound source
Coordinate is put, and makes the second count value be initialized as second value；If the second count value is less than the second lower threshold, one is made
Horizontal position coordinate of the horizontal position coordinate of frame voice signal correspondence sound source as present frame voice signal correspondence sound source；
Wherein, second value is less than the second upper limit threshold but more than the second lower threshold.
4. according to the method for claim 1 or 2, it is characterised in that according to the position coordinates of previous frame voice signal correspondence sound source
Determining the position coordinates of present frame voice signal correspondence sound source includes：
Judge present frame L channel sound signal intensity whether more than present frame right channel sound signal strength signal intensity and the right sound of previous frame
Road sound signal intensity；
If so, increase then the second count value；If the second count value is more than or equal to the second upper limit threshold, previous frame sound is made
Horizontal position of the numerical value obtained after the horizontal position coordinate increase of signal correspondence sound source as present frame voice signal correspondence sound source
Coordinate is put, and makes the second count value be initialized as second value；If the second count value is less than the second upper limit threshold, by upper one
Horizontal position coordinate of the horizontal position coordinate of frame voice signal correspondence sound source as present frame voice signal correspondence sound source；
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, previous frame sound is made
Horizontal position of the numerical value that the horizontal position coordinate of signal correspondence sound source is obtained after reducing as present frame voice signal correspondence sound source
Coordinate is put, and makes the second count value be initialized as second value；If the second count value is less than the second lower threshold, one is made
Horizontal position coordinate of the horizontal position coordinate of frame voice signal correspondence sound source as present frame voice signal correspondence sound source；
Wherein, second value is less than the second upper limit threshold but more than the second lower threshold.
5. method according to claim 1, it is characterised in that believed according to present frame left channel signals and present frame R channel
Number determine present frame voice signal type include：
Whether the intensity for judging present frame left channel signals is more than or equal to the intensity of present frame right-channel signals；
If so, present frame left channel signals are then selected to 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 that the corresponding simplified HMM algorithms of various sound types filter present frame voice signal is respectively adopted, is obtained
To the probability that a present frame voice signal is various sound types；
The corresponding sound type of maximum probability is defined as into the type of present frame voice signal.
6. method according to claim 1, it is characterised in that believed according to present frame left channel signals and present frame R channel
Number determine present frame voice signal type include：
Calculate the mean value of present frame left channel signals sampled point up-sampling value corresponding with present frame right-channel signals；
The characteristic parameter sequence of present frame sound is determined according to the mean value of each sampled point up-sampling value；
The characteristic parameter sequence that the corresponding simplified HMM algorithms of various sound types filter present frame voice signal is respectively adopted, is obtained
To the probability that a present frame voice signal is various sound types；
The corresponding sound type of maximum probability is defined as into the type of present frame voice signal.
7. method according to claim 6, it is characterised in that determined according to the mean value of each sampled point up-sampling value current
The characteristic parameter sequence of frame sound is：
According to the MFCC argument sequences of the mean value calculation present frame sound of each sampled point up-sampling value；
Using the MFCC argument sequences as present frame sound characteristic parameter sequence.
8. method according to claim 1, it is characterised in that L channel trap signal is sent to left speaker, and,
R channel trap signal is sent to right loudspeaker, is also included：
Antialiasing processes L channel trap signal and R 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 used to receive and sending signal；
Memory is used for store program codes；
Filter is used to read the program code of memory storage, and performs the virtual surround sound such as any one of claim 1-7
Player 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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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |