CN105872928A - Method and system for generating virtual surround sound based on mobile terminal - Google Patents
Method and system for generating virtual surround sound based on mobile terminal Download PDFInfo
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- CN105872928A CN105872928A CN201610263528.7A CN201610263528A CN105872928A CN 105872928 A CN105872928 A CN 105872928A CN 201610263528 A CN201610263528 A CN 201610263528A CN 105872928 A CN105872928 A CN 105872928A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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Abstract
The invention provides a method and system for generating a virtual surround sound based on a mobile terminal. The method comprises the steps of obtaining a moving direction of the head of a user through a direction sensor arranged in the mobile terminal; according to the moving direction of the head, through a virtual surround sound algorithm, converting a two-channel stereo of the mobile terminal into the virtual surround sound and outputting the virtual surround sound; and utilizing the virtual surround sound algorithm to simulate a transmitting sound and a reverberant sound through head-related transformation function in different spatial directions. According to the method and the system, a conventional headset is combined with the sensor of the mobile terminal, so that the mobile terminal has novel functions of outputting audio data having a virtual surround sound effect, improving users' hearing effects and bringing convenience to users.
Description
Technical field
The present invention relates to technical field of mobile terminals, particularly relate to the method and system that a kind of virtual surround sound based on mobile terminal generates.
Background technology
Current social development is increasingly faster, Internet technology and more and more higher with the combination degree of electronic technology.Requirement intelligent, hommization is more and more higher.The use popularization degree of mobile phone and portable set is more and more higher, the mobile incidental function of consumption electronic product contains in life production, multimedia function is also that consumer-elcetronics devices user uses most a kind of application, how to improve Consumer's Experience and user's impression becomes the problem that each producer is required for considering.
The function that prior art uses multimedia audio is arranged is placed on multimedia terminal equipment, the application that can play 360 degree of virtual reality contents is installed particular by mobile phone, in combination with the sensor of mobile phone, under the headset equipment wearing virtual reality, carry out watching the video at 360 degree of full visual angles.But, owing to handset earphone is merely able to export stereo, the output of mobile phone double horn also can only be three-dimensional output, so using prior art user can only hear stereo, but the sound heard only can transmit from the left side or the right, greatly reduces auditory effect, the great inconvenience of cause the user.
It follows that prior art has yet to be improved and developed.
Summary of the invention
The technical problem to be solved in the present invention is, drawbacks described above for prior art, the method and system that a kind of virtual surround sound based on mobile terminal generates are provided, it is intended to overcome disadvantages described above present in prior art by the present invention, the sensor of conventional earphone with mobile terminal itself is combined, mobile terminal is made to increase New function: output has the voice data around stereoeffect, improves the auditory effect of user, provides the user conveniently.
It is as follows that the present invention solves the technical scheme that technical problem used:
A kind of method that virtual surround sound based on mobile terminal generates, wherein, including step:
A, obtained the moving direction of user's head by the built-in direction sensor of mobile terminal；
B, moving direction according to described head, by virtual surround sound algorithm, be converted to virtual surround sound by the stereophony of described mobile terminal and export；
Described virtual surround sound algorithm is by the head related transfer function analog transmissions sound on different spaces direction and reverberation sound.
The method that described based on mobile terminal virtual surround sound generates, wherein, described step A specifically includes:
A1, by direction sensor obtain user's head traveling angle angle value in three dimensions；
A2, according to described traveling angle angle value, calculate the concrete moving direction of user's head.
The method that described based on mobile terminal virtual surround sound generates, wherein, described step B specifically includes:
Described double track audio mixing data, by virtual surround sound algorithm, are modified and are resolved by B1, moving direction according to described head；
B2, will modify and resolve after double track audio mixing data carry out digital-to-analogue conversion；
B3, the analogue signal after conversion is sent to the speaker of mobile terminal, and export corresponding virtual surround sound.
The method that described based on mobile terminal virtual surround sound generates, wherein, described method also includes: C, foundation user instruction, adjusts virtual ring around stereosonic volume and audio mixing pattern.
The method that described based on mobile terminal virtual surround sound generates, wherein, described mobile terminal is Android operation system terminal.
The system that a kind of virtual surround sound based on mobile terminal generates, wherein, including:
User's moving direction acquisition module, obtains the moving direction of user's head for the direction sensor built-in by mobile terminal；
Virtual surround sound output module, for the moving direction according to described head, by virtual surround sound algorithm, is converted to virtual surround sound by the stereophony of described mobile terminal and exports；
Described virtual surround sound algorithm is by the head related transfer function analog transmissions sound on different spaces direction and reverberation sound.
The system that described based on mobile terminal virtual surround sound generates, wherein, user's moving direction acquisition module specifically includes:
Traveling angle angle value acquiring unit, for obtaining user's head traveling angle angle value in three dimensions by direction sensor；
Moving direction computing unit, for according to described traveling angle angle value, calculating the concrete moving direction of user's head.
The system that described based on mobile terminal virtual surround sound generates, wherein, described virtual surround sound output module specifically includes:
Described double track audio mixing data, for the moving direction according to described head, by virtual surround sound algorithm, are modified and are resolved by speech analysis unit；
Voice D/A conversion unit, the double track audio mixing data after modifying and resolve carry out digital-to-analogue conversion；
Virtual surround sound transmitting element, for the analogue signal after conversion is sent the speaker to mobile terminal, and exports corresponding virtual surround sound.
The system that described based on mobile terminal virtual surround sound generates, wherein, also includes:
Voice adjusting module, for according to user instruction, adjusts virtual ring around stereosonic volume and audio mixing pattern.
The system that described based on mobile terminal virtual surround sound generates, wherein, described mobile terminal is Android operation system terminal.
The method and system that a kind of virtual surround sound based on mobile terminal provided by the present invention generates, described method specifically includes: obtained the moving direction of user's head by the direction sensor that mobile terminal is built-in；According to the moving direction of described head, by virtual surround sound algorithm, the stereophony of described mobile terminal is converted to virtual surround sound and exports；Described virtual surround sound algorithm is by the head related transfer function analog transmissions sound on different spaces direction and reverberation sound.Sensor built-in to conventional earphone and mobile terminal is combined by the present invention, the orientation (such as the azimuth information of left and right) of user's head oscillation is judged by this sensor, in conjunction with virtual surround sound algorithm, sound source signal is processed, sound field and sound size that the angle of each sound bearing separating and combining head rotation in sound changes sound gradually change with angle, thus allow user can will be apparent from hearing the orientation of sounding body and the sound field deviation experiencing sound in source of sound rotating oneself head angle when.So, user's sensation is not forever all at the dead ahead of head, and be as angle difference and have apart from upper, sound size and the deviation in orientation, thus get the audiovisual experience matched with virtual reality headset equipment, bring great advantage to the user.
Accompanying drawing explanation
Fig. 1 is the flow chart of the preferred embodiment of the method that the present invention virtual surround sound based on mobile terminal generates.
Fig. 2 is the Application Example schematic diagram of the method that the present invention virtual surround sound based on mobile terminal generates.
Fig. 3 is the functional block diagram of the preferred embodiment of the system that the present invention virtual surround sound based on mobile terminal generates.
Detailed description of the invention
The invention discloses the method and system that a kind of virtual surround sound based on mobile terminal generates, for making the purpose of the present invention, technical scheme and advantage clearer, clear and definite, the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to the flow chart that Fig. 1, Fig. 1 are the preferred embodiments of the method that the present invention virtual surround sound based on mobile terminal generates.The method that based on mobile terminal virtual surround sound shown in Fig. 1 generates, including:
Step S101, obtained the moving direction of user's head by the built-in direction sensor of mobile terminal.
In the embodiment of the present invention, described step S101 specifically includes:
A1, by direction sensor obtain user's head traveling angle angle value in three dimensions；
A2, according to described traveling angle angle value, calculate the concrete moving direction of user's head.
The embodiment of the present invention is mobile terminal based on Android operation system, is optimized existing Android audio software flow process, around the motion interface of stereo algorithm, virtual ring is integrated in android
In Framework layer Audioflinger assembly.Existing mobile terminal is all built-in with multiple sensors, such as direction sensor.What the realization of direction inductor device was leaned on is accelerometer, and the accelerometer used is triaxial accelerometer, is divided into X-axis, Y-axis and Z axis.The angle being typically when reality is applied to be constituted with these three axle (or any two axle) is to calculate the angle that mobile terminal tilts, thus calculates the value of acceleration of gravity.By the inertia force total amount of perception specific direction, accelerometer can measure acceleration and gravity.Triaxial accelerometer means motion or the gravitational attraction that it is able to detect that in three dimensions.Therefore, accelerometer can detect equipment be in just perpendicular, fall perpendicular, Zuo Heng, right horizontal stroke, face upward, state of bowing, azimuth, the anglec of rotation and the inclination angle on sensation level face.
Step S102, moving direction according to described head, by virtual surround sound algorithm, the stereophony of described mobile terminal being converted to virtual surround sound and exports, described virtual surround sound algorithm is by the head related transfer function (Head-related on different spaces direction
Transfer function, HRTF) analog transmissions sound and reverberation sound.
In the embodiment of the present invention, described step S102 specifically includes step:
Described double track audio mixing data, by virtual surround sound algorithm, are modified and are resolved by B1, moving direction according to described head；
B2, will modify and resolve after double track audio mixing data carry out digital-to-analogue conversion；
B3, the analogue signal after conversion is sent to the speaker of mobile terminal, and export corresponding virtual surround sound.
In actual application, the embodiment of the present invention needs to include following module: (1) mobile module, mobile terminal, it is necessary to have operating system support, based on installing music player in operating system；(2) handset module, passes through 3.5MM
Ordinary audio adapter be attached with mobile module；(3) micro-control module, primary module as the embodiment of the present invention, its effect is by the volume adjustment of music signal and call voice signal, the switching of Mike's path changes into input channel control, control digital signal processing unit DSP and the hardware initialization of other several core cells from charge mode, reception DSP core unit interrupts, active carries out boosting and is raised to 2.5V(wherein by 1.8V, and 1.8V is the rated operational voltage of mike)；(4) direction sensing module, is attached with micro-control module by I2C bus, and after the energising of whole earphone end, sensor assembly initializes, and starts catch user's head movement data and preserve in the memory unit；(5) signal conversion module, the analog audio data of mobile terminal is converted into digital audio-frequency data and is stored temporarily in memory module, by the data started in micro-control module, the data after conversion being carried out mixing operation, the data that bonding position sensor assembly transmits pass to DSP in the lump and carry out audio effect processing；(6) memory module, i.e. loop buffer pond, be used for storing voice data and user's head movement data；(7) power management module, powers for the power supply and each submodule managing whole handset module.
I.e., user inserts an earphone in the 3.5mm interface of mobile terminal or consumer electronics for carrying out audio signal communication, when earphone is started working, send hardware interrupt in micro-control module MCU to initialize to digital signal processing unit DSP simultaneously, amended audio, to downloading mode, is updated in DSP core element memory by transformation working pattern by I2C bus.Then restarting and reinitialize DSP unit, downloading mode is changed into mode of operation, now individual sound effect algorithms has formally updated.Convert analog signals into digital signal by signal conversion module and be stored temporarily in memory module, micro-control module sends instruction to memory module, data after notifying the direction sensor data of storage and sound audio mixing deliver to carry out inside DSP computing, owing to the read-write operation of DSP and memory module memory pool needs to cooperate, so needing to inform memory pool by callback mechanism, being disposed, memory pool can send data to DSP.Afterwards, the algorithm being carried in DSP is combined by real-time carrying out contrast computing, angle and the data of left and right passage audio mixing that joint head turns carry out resolving and data modifier, and deliver to signal conversion unit and carry out data and turn simulated operation, deliver to earphone speaker, ultimately become virtual surround sound by the data of the process of DSP core unit and be ultimately transferred in human ear.
Step S103, foundation user instruction, adjust virtual ring around stereosonic volume and audio mixing pattern.
That is, the embodiment of the present invention can carry out the adjustment of volume by accepting the current order of user and adjust audio mixing pattern the virtual surround sound generated, and further enhancing auditory effect.
Below by by concrete Application Example, the present invention will be further described.Fig. 2 is the Application Example schematic diagram of the method that the present invention virtual surround sound based on mobile terminal generates.As shown in Figure 2 (as a example by mobile phone), including:
S201, virtual reality player start.
S202, establishment player serviced component, application shared drive also by I/O device identifier mechanism, is contacted with Autioflinger service foundation, is realized the circulation of played data by binder mechanism.
S203, the mixerThread thread started by Autioflinger service obtain data after audio mixing.
S204, obtain user's head move angle data by mobile phone sensor, and be sent in Autioflinge outfan interface.
In actual application, obtaining sensors X, Y, the data on Z axis, carry out arithmetic analysis and get angle-data in the Sensor Process that micro-control module starts, arithmetic analysis is as follows:
getRotationMatrix(float[] R,
float[] I,
float[] gravity, float[]
geomagnetic) {
// TODO: move this to native code for efficiency
float Ax = gravity[0];
float Ay = gravity[1];
float Az = gravity[2];
final float Ex = geomagnetic[0];
final float Ey =
geomagnetic[1];
final float Ez =
geomagnetic[2];
float Hx = Ey*Az - Ez*Ay;
float Hy = Ez*Ax - Ex*Az;
float Hz = Ex*Ay - Ey*Ax;
final float normH =
(float)Math.sqrt(Hx*Hx + Hy*Hy
+ Hz*Hz);
if (normH < 0.1f) {
// device is close to free
fall (or in space?), or close to
// magnetic north pole.
Typical values are > 100.
return false;
}
final float invH = 1.0f
/ normH;
Hx *= invH;
Hy *= invH;
Hz *= invH;
final float invA = 1.0f
/ (float)Math.sqrt(Ax*Ax + Ay*Ay + Az*Az);
Ax *= invA;
Ay *= invA;
Az *= invA;
final float Mx = Ay*Hz -
Az*Hy;
final float My = Az*Hx - Ax*Hz;
final float Mz = Ax*Hy - Ay*Hx;
if (R != null) {
if (R.length
== 9) {
R[0]
= Hx; R[1] = Hy; R[2] = Hz;
R[3]
= Mx; R[4] =
My; R[5] = Mz;
R[6]
= Ax; R[7] = Ay; R[8] = Az;
} else if (R.length == 16) {
R[0]
= Hx; R[1] = Hy; R[2] = Hz;
R[3] = 0;
R[4]
= Mx; R[5] =
My; R[6] = Mz;
R[7] = 0;
R[8]
= Ax; R[9] = Ay; R[10] = Az; R[11] = 0;
R[12]
= 0; R[13] = 0; R[14] =
0; R[15] = 1;
}
}
if (I != null) {
// compute the inclination
matrix by projecting the geomagnetic
// vector onto the Z
(gravity) and X (horizontal component
// of geomagnetic vector)
axes.
final float invE = 1.0f / (float)Math.sqrt(Ex*Ex
+ Ey*Ey + Ez*Ez);
final float c = (Ex*Mx + Ey*My + Ez*Mz) * invE;
final float s = (Ex*Ax + Ey*Ay + Ez*Az)
* invE;
if (I.length
== 9) {
I[0]
= 1; I[1] = 0; I[2] = 0;
I[3]
= 0; I[4] = c; I[5] = s;
I[6]
= 0; I[7] =-s; I[8] = c;
} else if (I.length == 16) {
I[0]
= 1; I[1] = 0; I[2] = 0;
I[4]
= 0; I[5] = c; I[6] = s;
I[8]
= 0; I[9] =-s; I[10]= c;
I[3]
= I[7] = I[11] = I[12] = I[13] = I[14] = 0;
I[15]
= 1;
}
}
return true;
}。
S205, audio mixing data and the real-time angular data of acquisition are stored, deliver to third party's audio effect processing algorithm processes simultaneously.
Calculating angle-data and preserved in a storage module by angle-data, orientation angle and real-time digital audio-frequency data are sent to DSP and carry out the arithmetic analysis operation of virtual surround sound by micro-control module transmission order in the lump, and algorithm is as follows:
calculateOrientation() {
float[] values = new
float[3];
float[] R = new float[9];
SensorManager.getRotationMatrix(R,
null, accelerometerValues,
magneticFieldValues);
SensorManager.getOrientation(R,
values);// get now mobile phone and be arranged in virtual reality headset equipment, the angle number of head rotation.Can deliver to Framebuffer data after this angle and MixerThread virtual-reality acoustics algorithm is carried out to process // simultaneously
values[0] = (float) Math.toDegrees(values[0]);
}。
S206, the data of the virtual-reality acoustics of final arithmetic analysis are input in human ear after treatment.
Therefore, the sensor of conventional earphone with mobile terminal itself is combined by the present invention, makes mobile terminal increase New function: output has the voice data around stereoeffect, improves the auditory effect of user, provides the user conveniently.
Based on above-described embodiment, the present invention also provides for the system that a kind of virtual surround sound based on mobile terminal generates, as it is shown on figure 3, include:
User's moving direction acquisition module 100, obtains the moving direction of user's head for the direction sensor built-in by mobile terminal；As detailed above.
Virtual surround sound output module 200, for the moving direction according to described head, by virtual surround sound algorithm, is converted to virtual surround sound by the stereophony of described mobile terminal and exports；Described virtual surround sound algorithm is by the head related transfer function analog transmissions sound on different spaces direction and reverberation sound；As detailed above.
Voice adjusting module 300, for according to user instruction, adjusts virtual ring around stereosonic volume and audio mixing pattern；As detailed above.
Further, user's moving direction acquisition module 100 specifically includes:
Traveling angle angle value acquiring unit, for obtaining user's head traveling angle angle value in three dimensions by direction sensor；As detailed above.
Moving direction computing unit, for according to described traveling angle angle value, calculating the concrete moving direction of user's head；As detailed above.
Further, described virtual surround sound output module 200 specifically includes:
Described double track audio mixing data, for the moving direction according to described head, by virtual surround sound algorithm, are modified and are resolved by speech analysis unit；As detailed above.
Voice D/A conversion unit, the double track audio mixing data after modifying and resolve carry out digital-to-analogue conversion；As detailed above.
Virtual surround sound transmitting element, for the analogue signal after conversion is sent the speaker to mobile terminal, and exports corresponding virtual surround sound；As detailed above.
Further, described mobile terminal is Android operation system terminal.
Based on above-described embodiment, the present invention also provides for the embodiment of a kind of mobile terminal, and the mobile terminal described in the present embodiment includes the system that based on mobile terminal virtual surround sound described above generates.
In sum, the method and system that a kind of virtual surround sound based on mobile terminal provided by the present invention generates, described method specifically includes: described method specifically includes: obtained the moving direction of user's head by the direction sensor that mobile terminal is built-in；According to the moving direction of described head, by virtual surround sound algorithm, the stereophony of described mobile terminal is converted to virtual surround sound and exports；Described virtual surround sound algorithm is by the head related transfer function analog transmissions sound on different spaces direction and reverberation sound.Sensor built-in to conventional earphone and mobile terminal is combined by the present invention, the orientation (such as the azimuth information of left and right) of user's head oscillation is judged by this sensor, in conjunction with virtual surround sound algorithm, sound source signal is processed, sound field and sound size that the angle of each sound bearing separating and combining head rotation in sound changes sound gradually change with angle, thus allow user can will be apparent from hearing the orientation of sounding body and the sound field deviation experiencing sound in source of sound rotating oneself head angle when.So, user's sensation is not forever all at the dead ahead of head, and be as angle difference and have apart from upper, sound size and the deviation in orientation, thus get the audiovisual experience matched with virtual reality headset equipment, bring great advantage to the user.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, all these modifications and variations all should belong to the protection domain of claims of the present invention.
Claims (10)
1. the method that a virtual surround sound based on mobile terminal generates, it is characterised in that include step:
A, obtained the moving direction of user's head by the built-in direction sensor of mobile terminal；
B, moving direction according to described head, by virtual surround sound algorithm, be converted to virtual surround sound by the stereophony of described mobile terminal and export；
Described virtual surround sound algorithm is by the head related transfer function analog transmissions sound on different spaces direction and reverberation sound.
The method that virtual surround sound based on mobile terminal the most according to claim 1 generates, it is characterised in that described step A specifically includes:
A1, by direction sensor obtain user's head traveling angle angle value in three dimensions；
A2, according to described traveling angle angle value, calculate the concrete moving direction of user's head.
The method that virtual surround sound based on mobile terminal the most according to claim 2 generates, it is characterised in that described step B specifically includes:
Described double track audio mixing data, by virtual surround sound algorithm, are modified and are resolved by B1, moving direction according to described head；
B2, will modify and resolve after double track audio mixing data carry out digital-to-analogue conversion；
B3, the analogue signal after conversion is sent to the speaker of mobile terminal, and export corresponding virtual surround sound.
The method that virtual surround sound based on mobile terminal the most according to claim 3 generates, it is characterised in that described method also includes: C, foundation user instruction, adjust virtual ring around stereosonic volume and audio mixing pattern.
The method that virtual surround sound based on mobile terminal the most according to claim 1 generates, it is characterised in that described mobile terminal is Android operation system terminal.
6. the system that a virtual surround sound based on mobile terminal generates, it is characterised in that including:
User's moving direction acquisition module, obtains the moving direction of user's head for the direction sensor built-in by mobile terminal；
Virtual surround sound output module, for the moving direction according to described head, by virtual surround sound algorithm, is converted to virtual surround sound by the stereophony of described mobile terminal and exports；
Described virtual surround sound algorithm is by the head related transfer function analog transmissions sound on different spaces direction and reverberation sound.
The system that the most according to claim 6, virtual surround sound based on mobile terminal generates, it is characterised in that user's moving direction acquisition module specifically includes:
Traveling angle angle value acquiring unit, for obtaining user's head traveling angle angle value in three dimensions by direction sensor；
Moving direction computing unit, for according to described traveling angle angle value, calculating the concrete moving direction of user's head.
The system that the most according to claim 7, virtual surround sound based on mobile terminal generates, it is characterised in that described virtual surround sound output module specifically includes:
Described double track audio mixing data, for the moving direction according to described head, by virtual surround sound algorithm, are modified and are resolved by speech analysis unit；
Voice D/A conversion unit, the double track audio mixing data after modifying and resolve carry out digital-to-analogue conversion；
Virtual surround sound transmitting element, for the analogue signal after conversion is sent the speaker to mobile terminal, and exports corresponding virtual surround sound.
The system that the most according to claim 8, virtual surround sound based on mobile terminal generates, it is characterised in that also include:
Voice adjusting module, for according to user instruction, adjusts virtual ring around stereosonic volume and audio mixing pattern.
The system that the most according to claim 6, virtual surround sound based on mobile terminal generates, it is characterised in that described mobile terminal is Android operation system terminal.
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