CN116405837A - Virtual surrounding method and system for converting stereo sound into multichannel sound - Google Patents
Virtual surrounding method and system for converting stereo sound into multichannel sound Download PDFInfo
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Abstract
The invention discloses a virtual surrounding method and a system for converting stereo into multichannel sound, which belongs to the technical field of stereo-to-multichannel, and comprises the following steps: s1: the number of the configuration of the speakers is increased, the number of the configuration of the speakers is properly increased according to the area of the playing space, the surrounding sense is created by increasing the number of sound channels through more speakers, and the frequency range is enlarged, so that the high-fidelity effect is realized; s2: analyzing the stereo sound source and converting it into a multi-channel mode; s3: the playing space area is divided into a plurality of small areas according to the corresponding speakers installed in the areas, and the corresponding speakers are installed according to the positions of the small areas; s4: each seat in the space is marked and monitored, the condition of the seat in each area is obtained, an obvious surrounding effect can be achieved in the three-dimensional space, and corresponding speakers can be started according to the aggregation degree and the position of people in the playing space area, so that the aggregation crowd is always in the optimal listening area, and the surrounding effect is improved.
Description
Technical Field
The invention relates to the technical field of stereo-to-multichannel sound, in particular to a virtual surrounding method and a system for converting stereo into multichannel sound.
Background
Since the introduction of Digital Versatile Disks (DVDs) and super audio CDs, multi-channel audio has been widely used in sound systems, particularly in high-end sound systems for automobiles. However, it is desirable to maintain compatibility with existing dual channel stereo recordings and/or broadcasts. Therefore, the conversion of two-channel stereo to multi-channel format has been widely studied in recent decades:
the first stage: "monaural audio", commonly referred to simply as "monaural", uses only one audio channel to record sound, the oldest and most basic sound reproduction mode. When the speaker plays back an audio signal, the brain perceives "width" from the difference in signals received by the left and right ears, just as a single point on a geometric plane, with mono audio having only one sound source. Thus, when the mono audio is played back on a stereo speaker system (e.g., listening headphones or most speaker-pair configurations), the mono signal will appear in the same state in both channels in the stereo speaker system. No signal difference also means that the listener does not produce psychoacoustic localization and therefore its sound source does not exhibit a "width".
And a second stage: most modern music is released in "binaural", and the default output setting for most "digital audio workstations" is binaural. What does this mean? As the name implies, "binaural stereo" refers to sound having two channels, left and right.
This sounds as though it were not much different from mono, but means that the way in which binaural sound is sampled can be recorded, allowing the audio engineer the ability to fill the "width" sense of the audio, that is, the ability to process left and right channel audio information separately, or the ability to create two different "faces". In binaural stereo, the listener's brain may "localize" the audio according to the amplitude of each channel; if a sound is louder in the left channel than in the right channel, the listener's brain will "position" it to the left. Binaural stereo audio technology also enables us to measure audio signals in one dimension just like a straight line in the measured geometry plane.
And a third stage: the protocol of "surround sound" allows an audio engineer to mix more audio channels together. In a standard 5.1 surround sound setting, six channels are mixed, including five channels with full bandwidth, one "low frequency effects channel/subwoofer". The signals of these channels are sent to speakers placed around the listening position (including behind the listener). Thus, when you see the antipership 36433, hand 36433, and foot to the corner of the subject, you would appear to hear the floor of the hallway behind himself as if you were cruising.
If we compare two-channel stereo to a straight line, you can imagine surround sound as a square. Two audio channels of the binaural stereo can enable us to place sound generating points of sound at left and right positions of the stereo field; the six audio channels of surround sound can let us consider the stereo field as a plane instead of a simple straight line: because it has the "width" of sound compared to stereo. Although surround sound version mixing of musical compositions may not be necessary for most musicians, surround sound is of great importance in another audio field: movies, especially in home theatre environments where a full set of professional audio equipment is installed, surround sound can bring you an excellent audio-visual experience.
Fourth stage: for the presentation of the positioning and placing effect of the sound in the space position, the "panoramic sound" can be understood as rising one-dimensional surround sound, and a listener can realize the positioning of the sound in the three-dimensional stereo space through the panoramic sound technology, and in short, can be imagined as a spherical sound field surrounding a listener. Because a single point (mono) has no "length", a single line (stereo) has no "width", a single plane (surround) has no "height", and a panoramic sound is all long, wide, and high.
Panoramic sound adds spatial audio information in this dimension of "altitude" so that a listener can discern sounds coming from above or below it. The classical "dolby panoramic sound system" is to implement the playback requirement of panoramic sound by installing additional speakers on the ceiling. One of the most demanding functions for panoramic audio is that it can automatically perform a compatible process of "down-mixing" of audio files when playback is performed without a panoramic-adapted speaker system installed. This means that an audio engineer working in panoramic sound conditions does not need to deliver audio files in stereo format and in surround sound format separately at all.
In the prior art, although more loudspeakers surround the sound, the sound is not represented and can be heard, if the playing sound source is stereo, no matter how many loudspeakers are in the car, people can hear only a left channel and a right channel, the sound of a left front door loudspeaker is identical to that of a left rear door loudspeaker, and the perception of the sound source by a listener is limited to two plane dimensions of left and right.
For this reason, we propose a virtual surround method and system for converting stereo to multi-channel sound to solve the above-mentioned problems.
Disclosure of Invention
The present invention is directed to a virtual surround method and system for converting stereo sound into multi-channel sound, so as to solve the above-mentioned problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: a virtual surround method for converting stereo sound into multi-channel sound, comprising the steps of:
s1: the number of the configuration of the speakers is increased, the number of the configuration of the speakers is properly increased according to the area of the playing space, the surrounding sense is created by increasing the number of sound channels through more speakers, and the frequency range is enlarged, so that the high-fidelity effect is realized;
s2: analyzing the stereo sound source and converting it into a multi-channel mode;
s3: the playing space area is divided into a plurality of small areas according to the corresponding speakers installed in the areas, and the corresponding speakers are installed according to the positions of the small areas;
s4: marking and monitoring each seat in the space, acquiring the conditions of the seats in each area, judging the gathering position of the personnel and monitoring the gathering position;
s5: according to the position of the person gathering, the playing position information corresponding to the multichannel sound signals is controlled, the playing position information is used for reflecting the position of the loudspeaker, and the corresponding loudspeaker can be selected according to the area of the person gathering, so that the person gathering place is the optimal listening area.
Preferably, the process of converting the stereo sound into multiple channels is as follows:
s21: simultaneously generating a plurality of channel sound signal transitions;
s22: respectively converting front and rear sound signals;
s23: a rear two-channel surround sound signal is generated.
Preferably, the method for converting the front and rear sound signals respectively includes:
s221: generating sound signals of front three channels, wherein the sound signals played by the front three channels are used for sound source positioning, extracting and storing information related to the sound source position in the two-channel stereo signal in the conversion process, and feeding back the acquired sound signals to the corresponding front three channels after corresponding processing; and ensures that the original sound image positioning effect of the two-channel stereo is unchanged, and ensures that the sound image position listened by a listener in the central position is basically unchanged after the two-channel stereo is converted into the multi-channel surround sound.
S222: and generating rear two surround channel sound signals, extracting environment acoustic information capable of reflecting surround sense and space sense from the original two-channel stereo signal, correspondingly processing the extracted environment information to generate two sound signals with little correlation and even irrelevant, and respectively feeding the two sound signals to rear left and right surround channel sound signals, wherein in the generation process of the left and right surround channel sound signals, the surround sound signals are ensured not to generate any negative influence on sound image positioning of the front three channel signals.
S223: intermediate channels are used in a multi-channel surround sound system.
Preferably, in the step S223, when the middle channel is generated during the stereo conversion of the multi-channel surround sound, the sound signals are synthesized according to the correct proportion, so that the generated multi-channel sound signals do not change the direction of the original stereo image during the listening, any sound signal fed to the middle channel is attenuated by 3dB, and important sound signals are fed to the middle channel, the front left channel and the front right channel according to the proper proportion;
preferably, the process of generating the intermediate channelThe following are provided: adding a center channel, multiplying the coefficients by the addition of the left and right channels of the stereo
Representation, i.e.)>
Assuming that left, middle and right sounds recorded by two microphones with large intervals are added with the factor to ensure that the total energy of three channels is unchanged, when front middle channel sound signals are generated, adopting a PCA algorithm to generate two vectors which respectively represent the directions of a dominant signal y and a residual signal q, wherein the two directions are perpendicular to each other, creating a new coordinate system, and decoding the two signals in a matrix by taking the two signals as base signals;
the generation of the surround channel, which mainly plays the ambient sound effect, delays the front channel signal, the ambient information is obtained by the difference between the left and right channel signals in the original signal, the change is called the opposite phase component, the quantity can be represented by the residual signal q, and the correlation coefficient of the left and right channel signals can be represented as
Wherein, the liquid crystal display device comprises a liquid crystal display device,
and->
Average values of xL and xR are respectively obtained, in order to ensure that primary information and secondary information of signals are separated, ρ is not less than 0, and a three-bit mapping mode is adopted to obtain signals of multi-channel surround sound.
Preferably, the people gathering condition monitoring process is as follows:
s41, installing a display screen on each seat, automatically monitoring the positions of the individual persons from the crowd when the persons are seated at the positions, judging whether the persons are in the optimal listening area, if not, automatically sending a prompt to suggest the persons to move to the optimal listening area, and giving out the range display of the optimal listening area, wherein the persons can automatically select cancellation or determination according to the needs;
s42, when the control module receives the replied signal, the position of the optimal listening area is not required to be adjusted, whether the crowd range in the optimal listening area is expanded or not is monitored, and whether the optimal listening area needs to be expanded or not is judged according to the change of the crowd range;
and S43, when the existing optimal listening area is monitored to be full, and a certain number of people still exist in other seats, determining the number of people according to the feedback condition of the people, and adjusting the optimal listening area according to the number of people.
Preferably, in the process of converting the stereo sound into the multi-channel mode, the human sound and the musical instrument in the stereo sound source are set to the front sound field, and the environment sound is arranged at other positions, so that the stereo sound source has rich layers and vivid hearing enjoyment of details.
Preferably, the multi-channel output signal is played through speakers distributed around the playing space, so as to realize the surround sound effect.
A virtual surround system for stereophonic to multichannel sound, comprising:
the adding module is configured to add a certain number of loudspeakers in a space where multichannel sound playing is required and transmit the loudspeakers to the control module;
the analysis and conversion module is configured to analyze the stereo sound source, convert the stereo sound source into a multi-channel mode and play the multi-channel mode through a loudspeaker by a data signal;
the data processing module is configured to monitor the seat state of the playing area space, determine the position of a loudspeaker to be started according to the condition of people number aggregation, and transmit information to the control module;
and the control module is configured to receive the signal of the personnel gathering position transmitted by the data processing module and start a loudspeaker which can finish surrounding sound aiming at the area, so as to change the optimal listening area.
Preferably, the data processing module comprises an acquisition unit, a monitoring unit and a statistics unit, wherein the acquisition unit is used for acquiring serial numbers of listening seats in a space to be played and transmitting the serial numbers to the statistics unit, the statistics unit is used for receiving data signals transmitted by the acquisition unit and transmitting statistics and results according to regional planning to the monitoring unit, the monitoring unit is used for monitoring the seats in the playing space and corresponding to the results transmitted by the statistics unit, judging positions of personnel aggregation, and transmitting the data information to the control module.
Compared with the prior art, the invention has the beneficial effects that:
1. the three-dimensional space has obvious surrounding effect, has lower negative effect on main sound signals, expands the range of the optimal listening area, has the surrounding effect on the level of sound signals of the surrounding channel and has the surrounding effect on the whole three-dimensional space at the rear;
2. corresponding speakers can be started according to the degree and the position of people gathering in the playing space area, so that the gathered people are always in the optimal listening area, and the surrounding effect is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a flow chart of the sub-step S2 of the present invention;
FIG. 3 is a flow chart illustrating the sub-step of step S22 of the present invention;
FIG. 4 is a block diagram of a system architecture of the present invention;
fig. 5 is a schematic diagram of a segment of a stereo signal recording in an embodiment of the invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. adding a module; 2. an analysis conversion module; 3. a data processing module; 31. an acquisition unit; 32. a monitoring unit; 33. a statistics unit; 4. and a control module.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1 to 5, the present invention provides a virtual surround method and system for converting stereo sound into multi-channel sound, which comprises the following steps: a virtual surround method for converting stereo sound into multi-channel sound, comprising the steps of:
s1: the number of the configuration of the speakers is increased, the number of the configuration of the speakers is properly increased according to the area of the playing space, the surrounding sense is created by increasing the number of sound channels through more speakers, and the frequency range is enlarged, so that the high-fidelity effect is realized;
s2: analyzing a stereo sound source, converting the stereo sound source into a multi-channel mode, setting human voice and musical instruments in the stereo sound source to a front sound field, and arranging environmental sounds to other positions, so that the stereo sound source has rich layers and vivid detail hearing enjoyment; the multichannel signals are played through the loudspeakers distributed at all positions of the playing space, listeners are wrapped all around as if music is played, and the surround sound effect of the concert hall and the movie theatre is reproduced;
the process of stereo conversion to multi-channel is as follows:
s21: conversion of a plurality of channel sound signals is simultaneously generated: in the frequency domain, decomposing the double-channel stereo to be processed into direct sound and environment sound, multiplying the direct sound by a weight factor to determine the sound image azimuth, converting the double-channel stereo signal into a frequency domain signal for processing, and obtaining the direct sound and the environment sound; extracting main components of the two-channel stereo signal in a time domain;
s22: respectively generating front and rear sound signal conversion: respectively generating sound signals of three front channels and two rear channels by adopting two independent steps and two different methods, extracting sound image positioning information and environment acoustic information from original double-channel stereo sound, respectively feeding the sound image positioning information and the environment acoustic information into corresponding system channels, ensuring that the sound image position heard by a listener at the central position is unchanged in the generation process, and expanding listening pleasure relative to the original sound along with the addition of an intermediate channel;
s221: generating sound signals of front three channels, wherein the sound signals played by the front three channels are used for sound source positioning, extracting and storing information related to the sound source position in the two-channel stereo signal in the conversion process, and feeding back the acquired sound signals to the corresponding front three channels after corresponding processing; and ensures that the original sound image positioning effect of the two-channel stereo is unchanged, and ensures that the sound image position listened by a listener in the central position is basically unchanged after the two-channel stereo is converted into the multi-channel surround sound.
S222: and generating rear two surround channel sound signals, extracting environment acoustic information capable of reflecting surround sense and space sense from the original two-channel stereo signal, correspondingly processing the extracted environment information to generate two sound signals with little correlation and even irrelevant, and respectively feeding the two sound signals to rear left and right surround channel sound signals, wherein in the generation process of the left and right surround channel sound signals, the surround sound signals are ensured not to generate any negative influence on sound image positioning of the front three channel signals.
S223: when the multichannel surround sound system uses the middle channel, and when the middle channel is generated during the conversion of multichannel surround sound, the sound signals are synthesized according to the correct proportion, so that the direction of the original stereo sound image is not changed during the listening of the generated multichannel sound signals, any sound signal fed to the middle channel is attenuated by 3dB, and important sound signals are fed to the middle channel, the front left channel and the front right channel according to the proper proportion;
the process of generating the intermediate channel is as follows: adding a center channel, multiplying the coefficients by the addition of the left and right channels of the stereo
Representation, i.e.)>
Assuming that left, middle and right sounds recorded by two microphones with large intervals are added to ensure that the total energy of three channels is unchanged, when a front middle channel sound signal is generated, adopting a PCA (Principal Component Analysis) algorithm to generate two vectors which respectively represent the directions of a dominant signal y and a residual signal q, creating a new coordinate system by mutually perpendicular two directions as shown by a dotted line in fig. 5, and decoding the two signals in a matrix as a base signal;
the generation of the surround channel (based on matrix coding algorithm), the surround channel plays the ambient sound effect, gives people the sense of surround, the surrounding sense, delays the front channel signal, the ambient information (the environment and the ambient effect) is obtained by the difference value of the left and right channel signals in the original signal, the change is called the opposite phase component, the quantity can be expressed by the residual signal q, the correlation coefficient of the left and right channel signals can be expressed as
Wherein, the liquid crystal display device comprises a liquid crystal display device,
and->
Average values of xL and xR respectively, in order to ensure that main information and secondary information of signals are separated, ρ is larger than or equal to 0, and a three-position mapping mode is adopted to acquire multichannel surround signals, so that blurring can be avoided when main signal quantity approaches residual signal quantity, and a slice recorded by stereo signals of 20 th to 30 seconds, which is shown as a ferry port of Cai Qin, is shown in fig. 5Segments, in which the number of dominant signals is nearly equal to the remaining signals, form an elliptical distribution, the gain of each channel is time-varying, using a three-dimensional representation to produce the gain. Stereo principle component analysis techniques have proven to be a powerful tool to detect the direction of stereo images and then use it to derive the gain of the center channel.
S23: and generating a rear two-channel surround sound signal, extracting a space environment signal and performing related processing on a sound signal.
S3: the playing space area is divided into a plurality of small areas according to the corresponding speakers installed in the areas, and the corresponding speakers are installed according to the positions of the small areas;
s4: marking and monitoring each seat in a space, acquiring the condition of the seat in each area, judging the gathering position of a person, installing a display screen on each seat, automatically monitoring the position of a single person from a crowd when the person sits at the position, judging whether the person is in an optimal listening area, if not, automatically sending a prompt, suggesting that the person moves to the optimal listening area, giving a range display of the optimal listening area, automatically selecting cancellation or determining the person according to the need, when a control module receives a replied signal, not needing to adjust the position of the optimal listening area, monitoring whether the crowd range in the optimal listening area expands outwards, judging whether the optimal listening area needs to be enlarged according to the change of the crowd range, and when the existing optimal listening area is monitored to be full, and when a certain number of persons still exist in other seats, determining the number of the person according to the feedback condition of the person, and adjusting the optimal listening area according to the number of the person;
s5: according to the position of the person gathering, the playing position information corresponding to the multichannel sound signals is controlled, the playing position information is used for reflecting the position of the loudspeaker, and the corresponding loudspeaker can be selected according to the area of the person gathering, so that the person gathering place is the optimal listening area, and the surrounding playing effect is improved.
A virtual surround system for stereophonic to multichannel sound comprising:
the adding module 1 is configured to add a certain number of speakers in a space where multichannel sound playing is required and transmit the space to the control module 4, the number of the speakers is increased, the number of the speakers in a bicycle is increased from 6 to 8 to more than 10, part of high-end vehicle types are even increased to more than 30, and surrounding sense is created by increasing the number of channels through more speakers, and a frequency range is enlarged to realize high-fidelity effect;
an analysis conversion module 2 configured to analyze the stereo sound source, convert it into a multi-channel mode, and play it through the speaker by means of the data signal, a unique signal processing algorithm to analyze the stereo sound source, the stereo sound source is converted into a multi-channel mode, the human sound and the musical instrument in the stereo sound source are set to a front sound field, and the environment sound is arranged at other positions, so that the stereo sound source has rich layers and vivid detail hearing enjoyment; the multichannel signals are played through the loudspeakers distributed at all positions of the car cabin, listeners are wrapped all around as if music is played, and the surround sound effect of the concert hall and the movie theatre is reproduced;
the data processing module 3 comprises a collecting unit 31, a monitoring unit 32 and a statistics unit 33, wherein the collecting unit 31 is used for collecting serial numbers of listening seats in a space to be played and transmitting the serial numbers to the statistics unit 33, the statistics unit 33 is used for receiving data signals transmitted by the collecting unit 31 and transmitting statistics and results according to regional planning to the monitoring unit 32, the monitoring unit 32 is used for monitoring the seats in the playing space and corresponding to the results transmitted by the statistics unit 33, judging positions of personnel aggregation and transmitting the data information to the control module 4;
the control module 4 is configured to receive the signal of the people gathering location transmitted by the data processing module 3, and activate the speaker capable of completing surround sound for the area, so as to realize the change of the optimal listening area.
The invention has obvious surrounding effect in the three-dimensional space, has lower negative influence on main sound signals, expands the range of the optimal listening area, has the surrounding effect on the level of sound signals of the surrounding channel and the surrounding effect in the whole three-dimensional space at the rear, and can open corresponding speakers according to the gathering degree and the position of people in the playing space area, so that the gathering crowd is always in the optimal listening area, and the surrounding effect is improved.
The special signal processing algorithm analyzes the stereo sound source and converts the stereo sound source into a multi-channel mode, the human voice and musical instrument in the stereo sound source are set to a front sound field, and the environment sound is arranged at other positions, so that the stereo sound source has rich layers and vivid detail hearing enjoyment; the multichannel signal is played through the loudspeakers distributed around the cabin, and listeners are wrapped all around as if music is played, so that the surround sound effect of the concert hall and the movie theatre is reproduced.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A virtual surround method for converting stereo sound into multi-channel sound, characterized in that: the method comprises the following steps:
s1: the number of the configuration of the speakers is increased, the number of the configuration of the speakers is properly increased according to the area of the playing space, the surrounding sense is created by increasing the number of sound channels through more speakers, and the frequency range is enlarged, so that the high-fidelity effect is realized;
s2: analyzing the stereo sound source and converting it into a multi-channel mode;
s3: the playing space area is divided into a plurality of small areas according to the corresponding speakers installed in the areas, and the corresponding speakers are installed according to the positions of the small areas;
s4: marking and monitoring each seat in the space, acquiring the conditions of the seats in each area, judging the gathering position of the personnel and monitoring the gathering position;
s5: according to the position of the person gathering, the playing position information corresponding to the multichannel sound signals is controlled, the playing position information is used for reflecting the position of the loudspeaker, and the corresponding loudspeaker can be selected according to the area of the person gathering, so that the person gathering place is the optimal listening area.
2. A method of virtual surround sound according to claim 1, wherein: the process of stereo conversion to multi-channel is as follows:
s21: simultaneously generating a plurality of channel sound signal transitions;
s22: respectively converting front and rear sound signals;
s23: a rear two-channel surround sound signal is generated.
3. A method of virtual surround sound according to claim 2, wherein: the method for respectively converting the front sound signal and the rear sound signal comprises the following steps:
s221: generating sound signals of front three channels, wherein the sound signals played by the front three channels are used for sound source positioning, extracting and storing information related to the sound source position in the two-channel stereo signal in the conversion process, and feeding back the acquired sound signals to the corresponding front three channels after corresponding processing; and ensures that the original sound image positioning effect of the two-channel stereo is unchanged, and ensures that the sound image position listened by a listener in the central position is basically unchanged after the two-channel stereo is converted into the multi-channel surround sound.
S222: and generating rear two surround channel sound signals, extracting environment acoustic information capable of reflecting surround sense and space sense from the original two-channel stereo signal, correspondingly processing the extracted environment information to generate two sound signals with little correlation and even irrelevant, and respectively feeding the two sound signals to rear left and right surround channel sound signals, wherein in the generation process of the left and right surround channel sound signals, the surround sound signals are ensured not to generate any negative influence on sound image positioning of the front three channel signals.
S223: intermediate channels are used in a multi-channel surround sound system.
4. A virtual surround method for converting stereo sound into multi-channel sound according to claim 3, wherein: in the step S223, when the middle channel is generated during the stereo conversion of the multi-channel surround sound, the sound signals are synthesized in the correct proportion, so that the generated multi-channel sound signals do not change the direction of the original stereo image during the listening, any sound signals fed to the middle channel are attenuated by 3dB, and important sound signals are fed to the middle channel, the front left channel and the front right channel in the proper proportion.
5. A virtual surround method for converting stereo sound into multi-channel sound according to claim 3, wherein:
the process of generating the intermediate channel is as follows: adding a center channel, multiplying the coefficients by the addition of the left and right channels of the stereo
Representation, i.e.)>
Assuming that left, middle and right sounds recorded by two microphones with large intervals are added with the factor to ensure that the total energy of three channels is unchanged, when front middle channel sound signals are generated, adopting a PCA algorithm to generate two vectors which respectively represent the directions of a dominant signal y and a residual signal q, wherein the two directions are perpendicular to each other, creating a new coordinate system, and decoding the two signals in a matrix by taking the two signals as base signals;
the generation of the surround channel, which mainly plays the ambient sound effect, delays the front channel signal, the ambient information is obtained by the difference between the left and right channel signals in the original signal, the change is called the opposite phase component, the quantity can be represented by the residual signal q, and the correlation coefficient of the left and right channel signals can be represented as
Wherein, the liquid crystal display device comprises a liquid crystal display device,
and->
Average values of xL and xR are respectively obtained, in order to ensure that primary information and secondary information of signals are separated, ρ is not less than 0, and a three-bit mapping mode is adopted to obtain signals of multi-channel surround sound.
6. A method for virtual surround sound according to claim 1, wherein the process of monitoring the person gathering is as follows:
s41, installing a display screen on each seat, automatically monitoring the positions of the individual persons from the crowd when the persons are seated at the positions, judging whether the persons are in the optimal listening area, if not, automatically sending a prompt to suggest the persons to move to the optimal listening area, and giving out the range display of the optimal listening area, wherein the persons can automatically select cancellation or determination according to the needs;
s42, when the control module receives the replied signal, the position of the optimal listening area is not required to be adjusted, whether the crowd range in the optimal listening area is expanded or not is monitored, and whether the optimal listening area needs to be expanded or not is judged according to the change of the crowd range;
and S43, when the existing optimal listening area is monitored to be full, and a certain number of people still exist in other seats, determining the number of people according to the feedback condition of the people, and adjusting the optimal listening area according to the number of people.
7. A method of virtual surround sound according to claim 1, wherein: in the process of converting the stereo sound into the multi-channel mode, the human sound and musical instruments in the stereo sound source are set to the front sound field, and the environment sound is arranged at other positions, so that the stereo sound source has rich layers and vivid detail hearing enjoyment.
8. The method for virtual surround sound according to claim 6, wherein: the multi-channel output signals are played through speakers distributed in all positions of the playing space, and the surround sound effect is achieved.
9. A virtual surround system for stereophonic to multichannel sound, comprising:
an adding module (1) configured to add a certain number of speakers in a space where multi-channel sound playing is required, and transmit the added speakers to the control module (4);
an analysis conversion module (2) configured to analyze the stereo sound source, convert it into a multi-channel mode, and play it through a speaker by a data signal;
the data processing module (3) is configured to monitor the seat state of the playing area space, determine the position of a loudspeaker to be started according to the condition of people number aggregation, and transmit information to the control module (4);
and the control module (4) is configured to receive the signal of the personnel gathering position transmitted by the data processing module (3) and start the loudspeaker which can finish surrounding sound for the area, so as to realize the change of the optimal listening area.
10. A virtual surround system for converting stereo sound into multi-channel sound according to claim 1, wherein: the data processing module (3) comprises an acquisition unit (31), a monitoring unit (32) and a statistics unit (33), wherein the acquisition unit (31) is used for acquiring the serial number of a listening seat in a playing space to be transmitted to the statistics unit (33), the statistics unit (33) is used for receiving data signals transmitted by the acquisition unit (31) and transmitting statistics and results according to regional planning to the monitoring unit (32), the monitoring unit (32) is used for monitoring the seat in the playing space and corresponding to the results transmitted by the statistics unit (33), judging the gathering position of personnel, and transmitting the data information to the control module (4).
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