CN113965842A - Variable acoustic home theater sound system based on WFS wave field synthesis technology - Google Patents
Variable acoustic home theater sound system based on WFS wave field synthesis technology Download PDFInfo
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- CN113965842A CN113965842A CN202111454479.2A CN202111454479A CN113965842A CN 113965842 A CN113965842 A CN 113965842A CN 202111454479 A CN202111454479 A CN 202111454479A CN 113965842 A CN113965842 A CN 113965842A
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
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Abstract
The invention discloses a variable acoustic home theater sound system based on a WFS wave field synthesis technology, which comprises a digital sound source signal module, a decoder, a wave field synthesis processor, a plurality of array-distributed sound pickups and a convolution matrix module, wherein the array-distributed sound pickups pick up sound source signals in space in real time, the signals picked up by the sound pickups are respectively subjected to convolution processing with 3D impulse response of a virtual space in real time to obtain corresponding 3D virtual space reflected sound signals triggered by the positions of the sound pickups, the reflected sound signals are also fed into the wave field synthesis processor in real time, and reflected sounds from all directions are restored by plane waves to superpose spatial impressions. The invention provides a variable acoustic home theater sound system based on a WFS wave field synthesis technology, which can greatly enlarge 'emperor' positions relative to all physical seats in a central area covered by a 'virtual loudspeaker', enable each seat to be in an optimal listening area to reconstruct experience film source content, effectively solve the problem that the 'emperor' positions are limited by physical space, and achieve 360-degree omnibearing more uniform and full sound field experience.
Description
Technical Field
The invention relates to the technical field of home audio, in particular to a variable acoustic home theater sound system based on a WFS wave field synthesis technology.
Background
Home theater sound systems refer to the realistic presentation of sound effects that can only be enjoyed at theaters in the home, which is a product of today's perfect combination of digital and analog audio technologies. The current modern home theater has rich film source formats, no matter traditional playing media such as CD, DVD, blu-ray disc, hard disc player, etc., or network media based on streaming media technology, no matter it adopts sound channel-based technology or object-based technology for making and encoding, the finally decoded audio formats can be summarized as the following ones basically: and 2-channel stereo sound, 5.1 channels, 7.1 channels, 5.1.2 channels, 5.1.4 channels, 7.1.4 channels, 9.1.6 channels and the like. However, in the sound field reconstruction of the multi-channel format, an optimal listening point or listening area exists in a central point or a central area of a sound layout, and this point or area is generally called "emperor position", that is, subjective experience can be performed on the content of a film source signal more accurately in the "emperor position" direction, the production intention of a sound recorder or a sound mixer during recording is reconstructed, and conversely, the more the seat deviates from the "emperor position", the more distorted sound image localization is generated.
The aspects related to the home theater sound system are many, and the layout of a power amplifier, a loudspeaker and a sound box and the processing of the sound field environment can generate great influence on the tone quality and the 'emperor' position. In view of the fact that the cinema areas of common homes are all small and medium sized rooms, the floor area is limited, and the space size scale of a commercial cinema certified by related industries cannot be achieved (for example, a certain size scale requirement exists in a commercial cinema certified by Dolby), in order to obtain higher tone quality and wider 'emperor' position, the placement of the sound boxes of the common home cinema becomes more important, and the placement of the sound boxes is the most complicated. The majority of the existing home theater sound equipment is fixedly placed, the placing position needs to be repeatedly tested in order to pursue the sound quality effect and the range of 'emperor' position, the sound equipment is very inconvenient, and due to the site limitation of the common home theater, after the placing is completed, the sound quality effect and the range of 'emperor' can generate great difference along with the change of indoor configuration or number, and the perfect pursuit is difficult.
In order to solve the above technical problems, the industry has conducted related research for adjusting the position of a sound box to improve the sound quality and expand the 'emperor' position. For example, the chinese patent publication No. CN 105959869 a discloses a home theater sound box system convenient for adjusting the position of a sound box, which includes a power amplifier in the middle, a take-up reel for collecting information cables is disposed at the lower part of the power amplifier, a slide rail is further surrounded outside the take-up reel, at least one sound box capable of sliding on the slide rail is nested on the slide rail, and the sound box is connected with the power amplifier through the information cables. According to the invention, the slide rail is additionally arranged, and the sound box which can move along with the slide rail is embedded in the slide rail, so that the position of the sound box can be conveniently adjusted in real time, and the sound emitted by the sound box can achieve the best effect; the wire take-up reel is additionally arranged, so that the power amplifier can be conveniently connected with sound boxes at different positions through the information cables, the sound boxes can be moved conveniently, the wire take-up reel can release and take in the information cables, the information cables cannot be scattered, and the whole home theater sound system arranged on a television wall is attractive; the home theater sound system and the television wall are combined into a whole, the practicability is greatly increased, and the home theater sound system is suitable for wide popularization and application. However, the home theater sound system convenient for adjusting the position of the sound box disclosed in the patent achieves the effect of conveniently adjusting the position of the sound box by additionally arranging the slide rail, but is more complex in structure, consumes more in equipment cost, solves the problem of moving the home theater sound box and properly improves the sound quality, but still needs manual intervention when adjusting the position of the sound box, and does not have the effect of expanding the position of the emperor.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a variable acoustic home theater sound system based on a WFS wave field synthesis technology.
In order to achieve the above object, the present patent of invention designs a variable acoustic home theater sound system based on WFS wave field synthesis technology. A variable acoustic home cinema sound system based on WFS wave field synthesis technology, comprising:
digital sound source signal module: the digital sound source signal module decomposes the digital sound source signal into a multi-channel sound bed signal, object audio and object metadata through a decoder;
a decoder: the decoder is connected with the input route and the sound image matrix through an audio line, transmits the multi-channel sound bed signals and the object audio to the wave field synthesis processor, and finally transmits the object metadata to the wave field synthesis processor through a network protocol;
a wave field synthesis processor: a wave field synthesis processor adopts a WFS loudspeaker array to reconstruct a sound field (for details, see Chinese utility model patent ZL 201620657041.2-a listening room loudspeaker layout structure based on WFS wave field synthesis), virtual loudspeakers are reconstructed outside a physical space, and the wave field synthesis processor is used for restoring reflected sound from all directions through plane waves to superpose space impressions;
further comprising:
a plurality of array distribution's adapter: the method comprises the following steps of picking up sound source signals in a space in real time;
a convolution matrix module: and performing real-time convolution processing on the signals picked up by each sound pick-up and the 3D impulse response of the virtual space to obtain corresponding virtual room 3D reflected sound signals and virtual room 3D reflected sound azimuth metadata triggered by the position of each sound pick-up, transmitting the virtual room 3D reflected sound signals to a wave field synthesis processor through an input route and an acoustic image matrix, and transmitting the virtual room 3D reflected sound azimuth metadata to the wave field synthesis processor through a network protocol.
Preferably, the variable acoustic home theater sound system based on the WFS wave field synthesis technology further comprises the wave field synthesis processor connected with the power amplifier array and the WFS speaker array through a DA converter.
Preferably, the variable acoustic home theater sound system based on the WFS wave field synthesis technology further comprises that the audio signals picked up by the microphones Mic 1-Mic n distributed in the array are defined as x (n), n is an integer, and the numerical value of n represents the number of the microphones.
Preferably, the variable acoustic home theater sound system based on the WFS wave field synthesis technology further comprises that the virtual space 3D impulse response IR is defined as h (m), m represents each direction parameter ID in the 3D space, and the number depends on the discrete subdivision or differentiation degree of the space.
Preferably, the variable acoustic home cinema sound system based on WFS wave field synthesis technique further comprises the plane wave definition as virtual room 3D reflected sound orientation metadata.
Compared with the prior art, the invention has the following advantages:
1. the step of debugging the position of the sound box is omitted, and the obtained sound quality is higher;
2. the range of the best listening point 'emperor position' is obviously expanded, the problem that the 'emperor position' is limited by a physical space is effectively solved, and 360-degree omnibearing more uniform and full sound field experience is achieved.
Drawings
Fig. 1 is a diagram of a variable acoustic home theater system based on WFS wave field synthesis technology.
1. The system comprises a digital sound source signal module 2, a decoder 3, a wave field synthesis processor 4, a convolution matrix module 5, a plurality of sound pick-up devices 6 distributed in arrays, a multi-channel sound bed signal 7, object audio 8, object metadata 9, an audio line 10, an input route 11, a sound image matrix 12, a network protocol 13, a WFS loudspeaker array 14, virtual room 3D reflected sound 15, virtual room 3D reflected sound azimuth metadata 16, a DA converter 17 and a power amplifier array.
Fig. 2 is a diagram illustrating the position limitation of the emperor in a conventional multi-channel home theater sound system.
Fig. 3 is a schematic diagram of a emperor position of a variable acoustic home theater sound box system based on WFS wave field synthesis technology.
Fig. 4 is a schematic diagram of matrix distributed microphone sites.
Fig. 5 is a 3D directional diagram of 7.0.4.
Fig. 6 is a schematic 3D orientation of 7.0.4 with IR added definition.
Detailed Description
The technical solutions adopted by the present invention will be further described below with reference to the accompanying drawings so that those skilled in the art can better understand the present invention.
Referring to the standards of acoustic design specifications of theaters, cinemas and multi-purpose halls (GB/T50356-:
each small cinema 500-1000HZ influences time:
| room volume | ≤200m3 | 200～350m3 | 350～500m3 |
| Reverberation time(s) | 0.15～0.35 | 0.25～0.40 | 0.30～0.45 |
Sometimes, however, listening to film source content such as Hi-Fi binaural or listening in sound field environments such as concert halls, churches, etc. when the experiencer wishes to listen to the content, the viewing room has completely different requirements for acoustic design.
Referring to fig. 1 and 4, the present invention provides a variable acoustic home theater sound system based on WFS wave field synthesis technology, is used for solving the problems of complicated steps for adjusting the sound box, less emperor positions, poorer tone quality and the like of the traditional home theater sound system, the variable acoustic home theater sound system based on the WFS wave field synthesis technology comprises a digital sound source signal module 1, a decoder 2, a wave field synthesis processor 3, a convolution matrix module 4, a plurality of array-distributed sound pickups (namely black dots in figure 4 and arranged on the ceiling of a room in a hanging mode) 5, a multi-channel sound bed signal 6, object audio 7, object metadata 8, an audio line 9, an input route 10, a sound image matrix 11, a network protocol 12, a WFS loudspeaker array 13, a virtual room 3D reflected sound signal 14, a virtual room 3D reflected sound orientation metadata 15, a DA converter 16 and a power amplifier array 17.
Referring to fig. 1, the audio signals picked up by a plurality of microphones 4(Mic 1-Mic n) distributed in an array are defined as x (n), n is an integer, and the numerical value of n represents the number of the microphones.
Referring to fig. 1 and 5, the virtual room 3D impulse response IR is defined as h (m), m represents each direction parameter ID in the 3D space, and how much the number depends on the discrete subdivision or differentiation degree of the space, in the figure, m takes an integer of 1 to 11, 1 represents L (front left direction), 2 represents R (front right direction), 3 represents C (front center direction), 4 represents LSS (left direction), 5 represents RSS (right direction), 6 represents Lb (rear left direction), 7 represents Rb (rear right direction), 8 represents Ltf (front left direction), 9 represents Rtf (front right direction), 10 represents Ltb (rear left direction), 11 represents Rtb (rear right direction), and thus h (m) may be respectively: h (1) ═ ir (l), h (2) ═ ir (r), h (3) ═ ir (c), h (4) ═ ir (lss), h (5) ═ ir (rss), h (6) ═ ir (lb), h (7) ═ ir (rb), h (8) ═ ir (ltf), h (9) ═ ir (rtf), h (10) ═ ir (ltb), h (11) ═ ir (rtb).
See FIG. 1, definition ym(n) is the virtual room 3D reflected acoustic signal 14 after matrix convolution in each direction, and there are:
referring to fig. 1, in a specific use process, a digital sound source signal module 1 decomposes a digital sound source signal into a multi-channel sound bed signal 6, object audio 7 and object metadata 8 through a decoder 2, the decoder 2 is connected with an input route 10 and an acoustic image matrix 11 through an audio line 9, transmits the multi-channel sound bed signal 6 and the object audio 7 to a wave field synthesis processor 3, and finally transmits the object metadata 8 to the wave field synthesis processor 3 through a network protocol 12; signals picked up by a plurality of sound pick-up devices 5 distributed in an array are respectively convoluted with 3D impulse response of a virtual space in real time to obtain corresponding virtual room 3D reflected sound signals 14 and virtual room 3D reflected sound orientation metadata 15 triggered by the positions of the sound pick-up devices 5, the virtual room 3D reflected sound signals 14 are transmitted to the wave field synthesis processor 3 through an input route 10 and a sound image matrix 11, and the virtual room 3D reflected sound orientation metadata 15 are transmitted to the wave field synthesis processor 3 through a network protocol 12. And finally, the wave field synthesis processor 3 is connected with the power amplifier array 17 and the WFS loudspeaker array 13 through the DA converter 16, reflected sounds from all directions are restored by using plane waves to superpose space impression, and finally, the 'emperor' position is greatly enlarged, each seat can be positioned in an optimal listening area to reconstruct experience film source content, the limitation that the 'emperor' position is limited by physical space is effectively solved, and 360-degree omnibearing more uniform and full sound field experience is achieved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be within the technical scope of the present invention, and the technical solutions and novel concepts according to the present invention should be covered by the scope of the present invention.
Claims (5)
1. A variable acoustic home theater sound system based on WFS wave field synthesis technology is characterized by comprising
The digital sound source signal module decomposes the digital sound source signal into a multi-channel sound bed signal, object audio and object metadata through a decoder;
the decoder is connected with the input route and the sound image matrix through an audio line, and finally, the multi-channel sound bed signals and the object audio are transmitted to the wave field synthesis processor;
the decoder transmits the object metadata to the wave field synthesis processor through a network protocol;
the wave field synthesis processor adopts a WFS loudspeaker array to reconstruct a sound field, and virtual loudspeakers are reconstructed outside a physical space;
also comprises
The system comprises a plurality of sound pickups distributed in an array, a signal acquisition unit and a signal processing unit, wherein the sound pickups are used for picking up sound source signals in space in real time;
the convolution matrix module is used for performing real-time convolution processing on the signals picked up by each sound pick-up and the 3D impulse response of the virtual space to obtain corresponding virtual room 3D reflected sound signals and virtual room 3D reflected sound orientation metadata triggered by the position of each sound pick-up, the virtual room 3D reflected sound signals are transmitted to the wave field synthesis processor through an input route and the acoustic image matrix, and the virtual room 3D reflected sound orientation metadata are transmitted to the wave field synthesis processor through a network protocol;
the wave field synthesis processor superimposes a spatial impression by plane waves restoring reflected sound from various directions.
2. The variable acoustic home theater sound system based on WFS wave field synthesis technology as claimed in claim 1 wherein the wave field synthesis processor connects the power amplifier array and the WFS speaker array through a DA converter.
3. A variable acoustic home cinema sound system based on WFS wave field synthesis technique as claimed in claim 1, characterized in that the audio signals picked up by the distributed array of microphones Mic 1-Mic n are defined as x (n), n is an integer, and the value of n represents the number of the microphone.
4. The system of claim 1, wherein the 3D impulse response IR of the virtual space is defined as h (m), m represents each direction parameter ID in the 3D space, and the number depends on the discrete subdivision or differentiation degree of the space.
5. The system of claim 1, wherein the plane waves are defined as virtual room 3D reflected acoustic orientation metadata.
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