CN109151660B - Digital cinema sound returning system - Google Patents
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- H—ELECTRICITY
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- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
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- H—ELECTRICITY
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- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
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Abstract
The invention relates to a digital cinema sound returning system and a control method thereof, which comprises a sound returning system processor, a main sound channel DSP processor, a surround sound channel DSP processor, a software control platform, a power amplifier, a ring screen loudspeaker array (2), an ultra-low frequency loudspeaker (3), surround loudspeaker groups (4), (5) and (6) and the like. The method is characterized in that: the sound reproduction system processor analyzes and processes the film sound signals, and the software control platform enables the sound signals to enter the main sound channel DSP processor and the surround sound channel DSP processor through different sound channels. The software control platform controls the whole sound field environment, so that different frequency bands or different signals form different directivities, and meanwhile, a virtual sound source can be generated, an optimal listening point is cancelled, and various different virtual sound field environments are generated to adapt to different movie showing environments.
Description
Technical Field
The invention relates to a digital cinema sound reproduction system, in particular to a digital cinema sound reproduction system suitable for a non-sound-transmitting material screen and a control method thereof.
Background
The current digital cinema sound reproduction system consists of: the horn-type main sound amplifying loudspeaker system, the ultra-low frequency loudspeaker, the surround loudspeaker, the professional power amplifier, the digital cinema processor and the digital audio processor, and the matched video projection system comprises a professional digital high-resolution projector and a special sound transmission curtain. The main projector manufacturers are monopolized by foreign technologies, the resolution is generally 2K (2048x1080), and the development trend of projectors is that the resolution is gradually improved from 2K to 4K (4096x 2160). The horn main loudspeaker system and the ultra-low frequency loudspeaker are generally placed behind a sound-transmitting curtain to work.
In recent years, with the continuous improvement of domestic LED large screen display technology, the resolution ratio can completely reach the level of professional digital high-resolution projectors, and the size of the screen can not be limited any more. The market urgently needs a digital cinema sound reproduction system which can be matched with an LED large screen display video showing system.
The screen of traditional cinema curtain is made of sound-transparent material, and the horn main loudspeaker system and ultra-low frequency loudspeaker are generally placed behind the sound-transparent curtain. However, when the movie screen is made of non-sound-transmitting materials such as LED screen, the conventional sound amplification system of the main sound channel cannot be used. The loudspeaker array can solve the problem of sound amplification of the main sound channel, and has many characteristics that the traditional main sound channel sound amplification system is difficult to realize. The traditional sound amplifying system is difficult to change the directivity after the installation and the placement are finished.
The technology of the invention can adjust the directivity of the loudspeaker through the software control platform under the condition that the position of the loudspeaker is not changed, and can generate the virtual sound source linked with the movie image, so that the sound image position in the whole movie area is correct, the optimal listening point is cancelled, and meanwhile, the sound compensation can be performed on the movie theater with the unsatisfactory sound showing environment. These are all not realizable by conventional surround sound systems.
Disclosure of Invention
The invention designs a digital cinema sound returning system and a control method thereof, which solve the following technical problems: (1) the problem of sound amplification of a main sound channel with a non-sound-transmitting material as a movie screen is solved. (2) once the conventional speaker system is installed, the distribution of sound field cannot be changed, and the sound field distribution in audience areas is not uniform, and the audibility in some audience areas is poor.
In order to solve the technical problems, the invention adopts the following scheme:
the utility model provides a digital cinema sound reproduction system, includes sound reproduction system processor, main sound channel DSP treater, surround sound channel DSP treater, software control platform, power amplifier, ring screen speaker array (2), ultra low frequency speaker (3), surround speaker group (4, 5, 6), its characterized in that: the sound reproduction system processor analyzes the film sound signals, so that the sound signals enter the main sound channel DSP processor and the surround sound channel DSP processor through different sound channels; the whole sound field environment is controlled through a software control platform, the original sound field of the cinema is compensated, and various different virtual sound field environments are generated.
Further, the ring screen loudspeaker array (2) consists of a middle upper loudspeaker array, a middle lower loudspeaker array, a left side loudspeaker array and a right side loudspeaker array, wherein the middle upper loudspeaker array is a loudspeaker array above the screen; the middle lower loudspeaker array is a loudspeaker array below the screen; the left side loudspeaker array is a loudspeaker array on the left side of the screen; the right side loudspeaker array is a loudspeaker array on the right side of the screen, and the four groups of loudspeaker arrays are composed of a plurality of loudspeaker sub-arrays and are arranged around the screen in a linear mode.
Furthermore, the software control platform performs combined control through a main sound channel DSP processor and a surround sound DSP processor, compensates the original cinema sound field through a surround screen loudspeaker array (2), and generates various different virtual sound field environments; the DSP processor of the main sound channel can control the sound field of the main sound channel, so that the sound signals of the main sound channel are distributed in different audience areas, and the beam directivities of various sound fields are formed at the same time; the DSP processor of the surround channel can control the sound field of the surround channel, so that sound signals of the surround channel form specific space feeling and surrounding feeling after passing through the processor.
Further, the main channel DSP processor performs specific algorithm processing on the sound signals, and the processing algorithm includes, but is not limited to, weighting, filtering, delaying and the like, and can form different directivities in the vertical and horizontal planes; the DSP processor of the main sound channel has multi-channel input and multi-channel output, and the number of the output sound channels is consistent with the number of the units in the ring screen loudspeaker array (2); the sound signal of the central sound channel is processed and distributed into sound signals of a plurality of sound channels, and the sound signals are fed to the middle upper loudspeaker array and the middle lower loudspeaker array; the sound signals of the left and right channels are processed and distributed into sound signals of a plurality of channels, and the sound signals are respectively fed to the left side loudspeaker array and the right side loudspeaker array.
Further, the surround channel DSP processor performs digital signal processing on the sound signals, the processing algorithms include but are not limited to weighting, filtering, time delay and other algorithms, the overall original sound field environment is compensated through the algorithms, and a plurality of virtual sound fields of different types are generated simultaneously; the surround sound channel DSP processor is in multi-channel input and multi-channel output, and the number of output channels is consistent with the number of surround sound speakers.
Further, the power amplifier is responsible for power amplification of the sound signals of all the speakers in the sound reproduction system, and the total power of the power amplifier is the sum of the power required by all the speakers plus a power margin of 3 dB.
Further, each of the speaker sub-arrays (2) is composed of a single layer or a plurality of layers of transducers of different arrangement shapes.
A transducer in the present invention refers to a device that can convert any other form of energy into acoustic energy, including but not limited to existing speakers.
Further, the surround speaker group includes a right surround speaker (4), a left surround speaker (5), and a rear surround speaker (6), and the right surround speaker (4), the left surround speaker (5), and the rear surround speaker (6) are disposed in front of the non-sound-transmitting material screen.
Further, the non-sound-transmitting material screen is an LED screen (1) or an OLED screen or other non-sound-transmitting material screens.
A control method of a digital cinema sound returning system comprises the following steps: after the sound signals of the surround screen loudspeaker array pass through a signal processing algorithm, sound waves emitted by the loudspeaker sub-arrays (2) form different directivities after interference by utilizing a sound wave superposition principle, the directivities point to a specific audience area, the coverage angle of the loudspeaker array is changed, and the surround screen loudspeaker array is suitable for different movie projection environments.
A control method of a digital cinema sound returning system comprises the following steps: the acoustic signals of the loudspeaker subarray (2) are changed through an algorithm to be equal to the sound field intensity generated by the original sound source at the position so as to form a virtual sound source, and the time and space characteristics of the original sound field are reproduced.
Further, virtual sound sources are realized at different depths and different positions in the direction of the non-sound-transmitting material screen, or virtual sound sources are realized at different depths and different positions outside the non-sound-transmitting material screen.
The digital cinema sound reproduction system and the control method thereof have the following beneficial effects:
(1) the software control platform controls the whole sound field environment, so that different frequency bands or different signals form different directivities, and meanwhile, a virtual sound source can be generated, an optimal listening point is cancelled, and various different virtual sound field environments are generated to adapt to different movie showing environments.
(2) The scheme that the plurality of loudspeaker sub-arrays are tightly and uniformly distributed around the non-sound-transmitting material screen is used, the problem that the film screen is a main sound channel sound reinforcement of the non-sound-transmitting material is solved, and the non-sound-transmitting material screen becomes a film screen.
(3) The annular screen loudspeaker array is easy to be better matched with the LED screen, is beneficial to the installation of equipment, can be placed outdoors and is not limited by the field.
(4) The loudspeaker array can form adjustable directivity, so that the coverage angle of a sound field is increased, and the sound field can be uniformly distributed in different audience areas only by software adjustment under the condition of not changing the position of equipment, so that the loudspeaker array is suitable for different movie projection environments, for example, when the audience areas are upper and lower layers or other environments with obvious partitions.
(5) The loudspeaker array can realize virtual sound sources at different depths and different positions in the screen direction. Regardless of the location of the sweet spot, the sound image location is always correct and does not change with the change of the location of the viewer. The position of the virtual sound source is not limited in the screen area, but is adjusted in time according to the movie content, when the LED screen is naked eye 3D, the effect of integrating sound and picture can be realized, and the impression of audience is increased.
Drawings
FIG. 1: the invention discloses a structure schematic diagram of a digital cinema sound reproduction system.
FIG. 2: the invention discloses a position plan schematic diagram of a digital cinema sound reproduction system.
FIG. 3: the invention discloses a 3D schematic diagram of the position of a digital cinema sound reproduction system.
FIG. 4: the invention discloses a combined schematic diagram of a loudspeaker sub-array;
FIG. 5: the invention discloses an installation schematic diagram of a ring screen loudspeaker array;
FIG. 6: the invention discloses a loudspeaker subarray schematic diagram;
FIG. 7: the first layer transducer group of the loudspeaker sub-array in the invention is shown schematically;
FIG. 8: the distribution of the second layer of transducer group of the loudspeaker sub array is shown schematically;
FIG. 9: the third layer of transducer group of the loudspeaker sub array is distributed schematically;
FIG. 10: a schematic side view of a multi-layer transducer group assembly for a loudspeaker sub-array of the present invention;
FIG. 11: the invention discloses a directivity diagram of different frequency bands of a ring screen loudspeaker array.
FIG. 12: the invention discloses a directivity diagram of different signals of a ring screen loudspeaker array.
FIG. 13: the invention discloses a virtual motion sound source schematic diagram of a ring screen loudspeaker array.
Description of reference numerals:
1-an LED screen; 2-a loudspeaker sub-array; 21-a first transducer group; 22-a second transducer group; 23-a third transducer group; 3-ultra low frequency speaker; 4-right surround speaker; 5-left surround speaker; 6-rear surround speaker.
Detailed Description
The invention is further described below with reference to fig. 1 to 13:
as shown in fig. 1, the digital cinema sound returning system includes a surround-screen speaker array 2, an ultra-low frequency speaker 3, surround speakers 4, 5, 6, a power amplifier, a digital cinema processor, a main channel DSP processor, a surround channel DSP processor, a software control platform, and the like. The ring screen loudspeaker array 2 is composed of a plurality of loudspeaker sub-arrays 2, and the loudspeaker sub-arrays 2 are closely and uniformly distributed around the non-sound-transmitting material screen.
The sound reproduction system processor analyzes the film sound signal, so that the sound signal enters the main sound channel DSP processor and the surround sound channel DSP processor through different sound channels. The whole sound field environment is controlled through a software control platform, the original sound field of the cinema is compensated, and various different virtual sound field environments are generated.
The software control platform compensates the original cinema sound field through the combined control of the main sound channel DSP processor and the surround sound DSP processor to generate various different virtual sound field environments. The DSP processor of the main channel can control the sound field of the main channel, so that the sound signals of the main channel are distributed in different audience areas, and the beam directivities of various sound fields are formed. The DSP processor of the surround channel can control the sound field of the surround channel, so that sound signals of the surround channel form specific space feeling and surround feeling after passing through the processor.
The main channel DSP processor performs specific algorithm processing on the sound signals, and the processing algorithm includes but is not limited to weighting, filtering, delaying and the like, and different directivities can be formed in the vertical and horizontal planes. The DSP processor of the main sound channel has multi-channel input and multi-channel output, and the number of the output sound channels is consistent with the number of the units in the circular screen loudspeaker array. The sound signal of the center channel is processed and distributed into sound signals of a plurality of channels, and the sound signals are fed to the speaker arrays of the center speaker array 1 and the center speaker array 2. The sound signals of the left and right channels are processed and distributed into sound signals of a plurality of channels, and the sound signals are respectively fed to the left side loudspeaker array and the right side loudspeaker array.
The surround channel DSP processor performs digital signal processing on the sound signals, and the processing algorithms include, but are not limited to, weighting, filtering, delaying, etc. algorithms, and compensate the whole original sound field environment through these algorithms, and generate many different types of virtual sound fields at the same time. The surround sound channel DSP processor is used for multi-channel input and multi-channel output, and the number of output channels is consistent with that of surround sound speakers.
The power amplifier is responsible for amplifying the sound signals of all the loudspeakers in the sound reproduction system in power, and the total power of the power amplifier is the sum of the power required by all the loudspeakers plus a power margin of 3 dB.
The specific placement of the surround-screen loudspeaker array 2, the ultra low frequency loudspeaker 3, and the surround speakers 4, 5, 6 within the theatre is shown in fig. 2. The surround speakers include a right surround speaker 4, a left surround speaker 5, and a rear surround speaker 6, and the right surround speaker 4, the left surround speaker 5, and the rear surround speaker 6 are disposed in front of the screen of the non-sound-transmitting material.
As shown in fig. 3, the ring screen speaker array 2 is composed of a center speaker array 1, a center speaker array 2, a left side speaker array and a right side speaker array, wherein the center speaker array 1 is a speaker array above the screen; the middle speaker array 2 is a speaker array below the screen; the left side loudspeaker array is a loudspeaker array on the left side of the screen; the right side speaker array is the speaker array on the right side of the screen. The four groups of loudspeaker arrays are composed of a plurality of loudspeaker sub-arrays and are arranged around the screen in a linear mode.
In the conventional cinema sound reproduction system, the sound image of the center channel in the main channel cannot be changed, and the sound image position of the center channel can be changed by utilizing the sound energy ratio of the upper side loudspeaker array and the lower side loudspeaker array and the directivity of the arrays. For example: in the case where the acoustic environment inside the theater is ideal, when the directivity of the upper side speaker array and the lower side speaker array is the same region, the acoustic energy ratio is 1: 1, the sound image position is in the middle area, the sound image position can move upwards by adding the upper side loudspeaker array. The sound image position can be moved to a desired position by adjusting the sound energy ratio and the directivity.
As shown in fig. 4-7, a surround-screen speaker array includes a plurality of speaker sub-arrays 2, and the plurality of speaker sub-arrays 2 are distributed closely and uniformly around a screen of non-acoustically transparent material. The non-sound-transmitting material screen is an LED screen 1 or an OLED screen.
Each speaker sub-array 2 is composed of a plurality of layers of transducers of different arrangement shapes. Each loudspeaker subarray 2 consists of three layers of transducers with different arrangement shapes, and each layer corresponds to different frequency bands of sound signals by adopting a sound signal processing mode of three-frequency division; among them, the first transducer group 21 of the lower floor, it is responsible for dealing with the low frequency band of the sound signal; a second transducer group 22 of the intermediate layer, responsible for processing the intermediate frequency band of the sound signal; the upper, third transducer group 23, which is responsible for processing the high frequency band of the sound signal. The first transducer group 21 employs 1 transducer, the second transducer group 22 employs 4 transducers, and the third transducer group 23 employs 9 transducers and is arranged in a cross shape.
In the loudspeaker sub-array 2, the diameter of 1 transducer in the first transducer group 21 is d, the diameter of a transducer in the second transducer group 22 is d/2, and the diameter of a transducer in the third transducer group 23 is d/5;
when each loudspeaker subarray 2 consists of a single-layer transducer, a full-frequency sound signal processing mode is adopted, and the first transducer group 21 is responsible for the full frequency band of sound signals;
when each loudspeaker subarray 2 is composed of two layers of transducers, a sound signal processing mode of two frequency divisions is adopted, the first transducer group 21 on the lower layer is responsible for the low frequency band of sound signals, the second transducer group 23 on the upper layer is responsible for the high frequency band of sound signals, and the frequency dividing point f1 of the low frequency band and the high frequency band should meet the following conditions:
or when each loudspeaker subarray 2 consists of three layers of transducers, the three layers of transducers with different arrangement shapes are adopted, and a sound signal processing mode of three-frequency division is adopted, wherein each layer corresponds to different frequency bands of sound signals; among them, the first transducer group 21 of the lower floor, it is responsible for dealing with the low frequency band of the sound signal; a second transducer group 22 of the intermediate layer, responsible for processing the intermediate frequency band of the sound signal; the upper, third transducer group 23, which is responsible for processing the high frequency band of the sound signal.
The frequency dividing point f2 of the low frequency band and the middle frequency band preferably satisfies the following conditions:
the frequency dividing point f3 of the middle band and the high band preferably satisfies the following condition:
the transducers in the same group of transducer groups have the same phase and the same sensitivity, size and rated power.
The invention discloses a control method of a digital cinema sound reproduction system, which has the following working principle: based on DSP processing technology, sound signals of the surround screen loudspeaker array pass through weighting, delaying or filtering algorithms, sound waves are superposed by utilizing a sound wave superposition principle, sound waves emitted by the loudspeaker subarrays 2 form different directivities in different frequency bands or different signals, the coverage angle of the loudspeaker array is increased, sound fields in audience areas are distributed uniformly, and the surround screen loudspeaker array is suitable for different movie showing environments. By the adjustment of the algorithm, the directivity and the sound field distribution of the plurality of speaker sub-arrays 2 are adjusted.
The speaker array can form different directivities in different frequency bands, as shown in fig. 7, the speaker array can form a specific directivity in a high frequency band by controlling the high frequency unit, and the array can realize the divided-band directivities in four directions of the upper, lower, left and right directions of the screen. The adjustment angle of the low-frequency band directivity is theta1The adjustment angle of the middle frequency band directivity is theta2The adjustment angle of the high-frequency band directivity is theta3The delay unit responsible for each transducer in the first transducer group 21 of low frequency band is t1The delay elements of the transducers of the second transducer group 22 responsible for the intermediate frequency band are t2The delay unit of the transducers of the third transducer group 22 responsible for the high frequency band is t3And v is the speed of sound:
for example: the low-frequency band of the loudspeaker array on the left side of the screen needs to be downwards adjusted to be theta1From bottom to top, the delay of the first unit is 0, the delay of the second unit is t1Delay bit 2t of the third unit1The delay of the Nth unit is (N-1) t1。
The loudspeaker array can make different signals form different directivities, as shown in fig. 8, because the loudspeaker array is a divide-by-three signal process, different signals are first separated into low frequency signals, intermediate frequency signals, and high frequency signals by filtering. After different frequency bands of different signals are processed by the time delay algorithm, different signals are superposed on the same frequency band and then fed into each transducer unit in the loudspeaker array. For example: the two signals are respectively a signal 1 and a signal 2, firstly, the signals are divided into a signal 1 low frequency band, a signal 1 middle frequency band, a signal 1 high frequency band, a signal 2 low frequency band, a signal 2 middle frequency band and a signal 2 high frequency band after the filtering processing is respectively carried out on the signal 1 and the signal 2, then, the delay processing is carried out on the six groups of signals according to the directivity adjusting algorithm, each signal forms a plurality of sound channels as many as the total number of the transducers, the number of the sound channels which is two times of the total number of the transducers is formed, every two sound channels correspond to the same transducer, and finally, the two sound channels corresponding to the same transducer are superposed and fed to the transducer.
The invention relates to a control method for matching a ring screen loudspeaker array with a screen image, which has the following working principle: the acoustic signals of the speaker subarray 2 are changed through an algorithm to be equal to the sound field intensity generated by the original sound source at the position so as to form a virtual sound source, and the time and space characteristics of the original sound field are reproduced. Virtual sound sources are realized at different depths and different positions in the direction of the non-sound-transmitting material screen, or virtual sound sources are realized at different depths and different positions outside the non-sound-transmitting material screen.
Assuming that a virtual sound source is S, Fourier transform of a virtual sound source signal is S (w), firstly, the signal is filtered to obtain signals S of three frequency bands1(w) is the low band, S2(w) is the intermediate frequency band, S3And (w) is a high frequency band. The drive signal of the first layer transducer is D1(a) The driving signal of the second layer transducer is D2(a) The driving signal of the transducer of the third layer is D3(a) In that respect Wherein: a represents the different positions of the transducer. The distance between the first layer transducer and the second layer transducer is L1The distance between the transducer of the first layer and the transducer of the third layer is L2.Virtual sound source is behind loudspeaker arrayThe normal distance of the first layer of transducers in the loudspeaker array is y1The listener is in front of the loudspeaker array, and the first layer of transducers in the loudspeaker array is at a distance y from the listener's normal2The linear distance of the virtual sound source from the transducer is r1J represents an imaginary number, w is the angular frequency, and e is the natural logarithm; v represents the speed of sound then:
the loudspeaker array not only can form a virtual sound source behind the array, but also can form a focused sound source in front of the array, so that the virtual sound source can realize different depths. The specific method comprises the following steps: the virtual sound source is in front of the loudspeaker array and at a normal distance y from the loudspeaker array3The listener is in front of the loudspeaker array at a distance y from the listener's normal4The linear distance of the virtual sound source from the transducer is r2。
The loudspeaker array not only can form a virtual sound source behind the array, but also can form a focused sound source in front of the array, so that the virtual sound source can realize different depths. The specific method comprises the following steps: the drive signal of the first layer transducer is Q1(a) The driving signal of the second layer transducer is Q2(a) The driving signal of the transducer of the third layer is Q3(a) In that respect Where a represents the different positions of the transducer. The distance between the first layer transducer and the second layer transducer is L1The distance between the transducer of the first layer and the transducer of the third layer is L2.The virtual sound source is in front of the loudspeaker array and at a distance y from the normal of the first layer of transducers in the loudspeaker array3With the listener in front of the loudspeaker array, the first layer of transducers in the loudspeaker array being spaced from the listenerLine distance of y4Wherein y is4>y3The linear distance of the virtual sound source from the transducer is r2. v represents the speed of sound then:
wherein Q*(a) Represents the conjugate of Q (a).
By performing the above-described processing on the virtual sound source signal, the position of the virtual sound source can be changed in real time, and a virtual moving sound source can be formed as shown in fig. 13. The virtual sound source 1 and the virtual sound source 2 move in real time at different positions of the screen, up, down, left, right, front and back, and the movement position of the virtual sound source is consistent with the movement state in the movie image, so that the linkage between sound and pictures can be generated, and the double-3D vivid viewing sense is formed.
The loudspeaker array can realize not only a single virtual sound source, but also the reflected sound of the virtual sound source at the same time, and only a virtual sound source with the same signal as the virtual sound source is formed at a different position, at the moment, the signal amplitude is attenuated by β times, and the relation between the driving signal J (a) of the transducer and the original virtual sound source is as follows:
β (w) is a function related to the frequency and reflection coefficient of the reflected sound, which can increase the sense of space and distance for the audience by forming reflected sound at different positions, and when forming reflected sound at a certain attenuation at a plurality of different positions, which can make the audience feel a sense of reverberation in the virtual sound source, a variable reverberant sound is formed.
This method is not limited by the sweet spot, and the sound image location is always correct no matter where the viewer is, and will not change with the change of the viewer's location. And the combination with the movie picture content increases the audience's sight and immersion. Meanwhile, the sound compensation can be performed on cinemas with poor sound environment, and the effect which cannot be achieved when the original film is played back is achieved.
The invention is described above with reference to the accompanying drawings, it is obvious that the implementation of the invention is not limited in the above manner, and it is within the scope of the invention to adopt various modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.
Claims (8)
1. A digital cinema sound reproduction system comprises a sound reproduction system processor, a main sound channel DSP processor, a surround sound channel DSP processor, a software control platform, a power amplifier, a ring screen loudspeaker array, an ultra-low frequency loudspeaker and a surround loudspeaker group, wherein each ring screen loudspeaker array consists of a plurality of layers of transducers with different arrangement shapes, the sound reproduction system processor analyzes sound signals of a movie, the sound signals enter the main sound channel DSP processor and the surround sound channel DSP processor through different sound channels, the whole sound field environment is controlled through the software control platform, the sound field of an original cinema is compensated, and a plurality of different virtual sound field environments are generated, the digital cinema sound reproduction system is characterized in that the ring screen loudspeaker array not only realizes a single virtual sound source A, but also realizes the reflected sound of the virtual sound source A, only a virtual sound source B is formed at different positions, the virtual sound source B is the same as the virtual sound source A, at the moment, the signal amplitude is attenuated by β times, and the relation between the driving signals J (a) of the transducers and the virtual sound source A is as follows:
β (w) is a function related to the frequency and reflection coefficient of the reflected sound, a represents different positions of the transducers, and the distance L between the transducer of the first layer and the transducer of the second layer1The distance between the transducer of the first layer and the transducer of the third layer is L2The virtual sound source A is behind the ring screen loudspeaker array and has a normal distance of y from the first layer of transducers in the ring screen loudspeaker array1The listener is in front of the surround screen speaker array, and the first layer of transducers in the surround screen speaker array is at a distance y from the listener's normal2The linear distance between the virtual sound source A and the nearest transducer is r1J represents an imaginary number, w is the angular frequency, and e is the natural logarithm; v represents the speed of sound;
when a plurality of reflected sounds having specific attenuations at different positions are formed, the listener feels a sense of reverberation in the virtual sound source B, and variable reverberant sounds are formed.
2. The digital cinema sound reproduction system according to claim 1, characterized in that: the ring screen loudspeaker array consists of a middle upper loudspeaker array, a middle lower loudspeaker array, a left side loudspeaker array and a right side loudspeaker array, wherein the middle upper loudspeaker array is the loudspeaker array above the screen; the middle lower loudspeaker array is a loudspeaker array below the screen; the left side loudspeaker array is a loudspeaker array on the left side of the screen; the right side loudspeaker array is a loudspeaker array on the right side of the screen, and the four groups of loudspeaker arrays are composed of a plurality of loudspeaker sub-arrays and are arranged around the screen in a linear mode.
3. The digital cinema sound reproduction system according to claim 2, characterized in that: the software control platform is controlled by a main sound channel DSP processor and a surround sound channel DSP processor in a combined manner, and compensates the original cinema sound field through a surround screen loudspeaker array to generate various different virtual sound field environments; the DSP processor of the main sound channel can control the sound field of the main sound channel, so that the sound signals of the main sound channel are distributed in different listener areas, and beam directivities of various sound fields are formed at the same time; the sound field of the surround channel can be controlled by the surround channel DSP processor, so that the sound signals of the surround channel form specific space feeling and surrounding feeling after being processed.
4. The digital cinema sound reproduction system according to claim 1, characterized in that: the DSP processor of the main sound channel processes the sound signals, and processing algorithms comprise weighting, filtering and time delay algorithms and can form different beam directivities in the vertical plane and the horizontal plane; the DSP processor of the main sound channel has multi-channel input and multi-channel output, and the number of the output sound channels is consistent with the number of the transducers in the circular screen loudspeaker array; the sound signal of the center channel is processed and distributed into the sound signals of a plurality of channels, and the sound signals are fed to the middle upper loudspeaker array and the middle lower loudspeaker array; the sound signals of the left and right channels are processed to be distributed into sound signals of a plurality of channels, which are fed to the left speaker array and the right speaker array, respectively.
5. The digital cinema sound reproduction system according to claim 1, characterized in that: the surround sound channel DSP processor performs digital signal processing on the sound signals, the processing algorithm comprises weighting, filtering and time delay algorithms, the overall original cinema sound field environment is compensated through the algorithms, and multiple virtual sound fields of different types are generated at the same time; the surround channel DSP processor has multiple inputs and multiple outputs, and the number of output channels is consistent with the number of surround sound speakers.
6. The digital cinema sound reproduction system according to claim 1, characterized in that: the power amplifier is responsible for carrying out power amplification on the sound signals of all the loudspeakers in the digital cinema sound returning system, and the total power of the power amplifier is the sum of the power required by all the loudspeakers plus a power margin of 3 dB.
7. The digital cinema sound reproduction system according to any one of claims 2-6, characterized in that: the screen is the non-sound-transmitting material screen, surround speaker group and include right side surround speaker, left side surround speaker and back surround speaker, and right side surround speaker, left side surround speaker and back surround speaker set up in non-sound-transmitting material screen the place ahead.
8. The digital cinema sound reproduction system according to claim 7, characterized in that: the non-sound-transmitting material screen is an LED screen or an OLED screen.
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| CN201811027562.XA CN109151660B (en) | 2018-09-04 | 2018-09-04 | Digital cinema sound returning system |
| PCT/CN2018/109217 WO2020047932A1 (en) | 2018-09-04 | 2018-09-30 | Digital cinema sound reproduction system and control method therefor |
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| CN112339681A (en) * | 2019-08-09 | 2021-02-09 | 深圳市索威科技有限公司 | Cinema-level automobile cinema sound |
| CN110493702B (en) * | 2019-08-13 | 2021-06-04 | 广州飞达音响股份有限公司 | Six-face sound cinema sound returning system |
| FI20195978A1 (en) | 2019-11-15 | 2021-05-16 | Genelec Oy | Loudspeaker and loudspeaker control system |
| CN111708509A (en) * | 2020-06-09 | 2020-09-25 | 上海幕革科技有限公司 | Method and system for improving playing effect of sound system |
| CN113329320B (en) * | 2021-05-27 | 2023-03-24 | 音王电声股份有限公司 | Object-based sound image synthesis method of ring screen loudspeaker array and application thereof |
| CN116347320B (en) * | 2022-09-07 | 2024-05-07 | 荣耀终端有限公司 | Audio playing method and electronic equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1177433A (en) * | 1995-09-07 | 1998-03-25 | Rep投资有限责任公司 | In-home theater surround sound speaker system |
| CN204865011U (en) * | 2015-08-25 | 2015-12-16 | 北京耀莱国际文化产业投资有限公司 | Structure is arranged to audio amplifier of cinema stereo set |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6118876A (en) * | 1995-09-07 | 2000-09-12 | Rep Investment Limited Liability Company | Surround sound speaker system for improved spatial effects |
| GB0321676D0 (en) * | 2003-09-16 | 2003-10-15 | 1 Ltd | Digital loudspeaker |
| KR100678929B1 (en) * | 2003-11-24 | 2007-02-07 | 삼성전자주식회사 | Method For Playing Multi-Channel Digital Sound, And Apparatus For The Same |
| KR100934928B1 (en) * | 2008-03-20 | 2010-01-06 | 박승민 | Display Apparatus having sound effect of three dimensional coordinates corresponding to the object location in a scene |
| FR2984064B1 (en) * | 2011-12-13 | 2016-07-22 | Anagram Acoustics | SOUND REPRODUCTION DEVICE AND METHOD FOR LOW FREQUENCIES |
| CN202401792U (en) * | 2012-01-30 | 2012-08-29 | 山东惠影科技传媒股份有限公司 | Container type digital cinema |
| CN106105270A (en) * | 2014-03-25 | 2016-11-09 | 英迪股份有限公司 | For processing the system and method for audio signal |
| DE102015003582B4 (en) * | 2015-03-23 | 2017-07-06 | Viktor Panov | Movie theater audio system |
| CN106303842B (en) * | 2015-06-08 | 2018-05-25 | 闫冰 | A kind of 3D virtual immersives panorama sound recording system |
| CN204929218U (en) * | 2015-08-27 | 2015-12-30 | 南京中广华夏影视科技有限公司 | A three -dimensional playback system for cinema reproduction room |
-
2018
- 2018-09-04 CN CN201811027562.XA patent/CN109151660B/en active Active
- 2018-09-30 WO PCT/CN2018/109217 patent/WO2020047932A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1177433A (en) * | 1995-09-07 | 1998-03-25 | Rep投资有限责任公司 | In-home theater surround sound speaker system |
| CN204865011U (en) * | 2015-08-25 | 2015-12-16 | 北京耀莱国际文化产业投资有限公司 | Structure is arranged to audio amplifier of cinema stereo set |
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