CN112840678A - Stereo playing method, device, storage medium and electronic equipment - Google Patents
Stereo playing method, device, storage medium and electronic equipment Download PDFInfo
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- CN112840678A CN112840678A CN201880098484.4A CN201880098484A CN112840678A CN 112840678 A CN112840678 A CN 112840678A CN 201880098484 A CN201880098484 A CN 201880098484A CN 112840678 A CN112840678 A CN 112840678A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
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Abstract
The application discloses a stereo playing method, which comprises the following steps: extracting a stereo signal with azimuth information in an audio signal, decoding the stereo signal to obtain a multi-channel signal, transcoding the multi-channel signal into a dual-channel signal, respectively performing crosstalk elimination on the dual-channel signal, and outputting the dual-channel signal to the dual speakers for playing. The application also provides a stereo playing device, a storage medium and an electronic device.
Description
The present application belongs to the field of acoustic technologies, and in particular, to a stereo playing method and apparatus, a storage medium, and an electronic device.
With the continuous development of electronic devices, the multimedia playing function on a mobile phone has become one of the functions used by users daily, and the requirements of users on the audio playing effect of mobile phones are higher and higher, one of the current ways of improving the audio playing effect is to realize stereo playing, the effect of realizing stereo playing needs larger space and equipment, which is not beneficial to portable electronic devices such as mobile phones and the like to realize stereo playing, at present, the solution of most manufacturers is to realize the effect of stereo playing by constructing a virtual speaker array at an earphone end, and the other solution is to arrange two speakers as external playing equipment on the mobile phone, so that the effect of stereo playing can be realized while the volume is improved.
Content of application
The embodiment of the application provides a stereo playing method, a stereo playing device, a storage medium and electronic equipment, which can achieve the effect of stereo playing.
In a first aspect, an embodiment of the present application provides a stereo playing method, which is applied to an electronic device, where the electronic device includes two speakers, and the method includes:
extracting a stereo signal with azimuth information in the audio signal;
decoding the stereo signal to obtain a multi-channel signal;
transcoding the multi-channel signal into a two-channel signal;
and respectively carrying out crosstalk elimination on the two-channel signals and outputting the two-channel signals to the double loudspeakers for playing.
In a second aspect, an embodiment of the present application provides a stereo playback apparatus, which is applied to an electronic device, where the electronic device includes two speakers, and the apparatus includes:
the extraction module is used for extracting a stereo signal with azimuth information in the audio signal;
the decoding module is used for decoding the stereo signal to obtain a multi-channel signal;
a transcoding module for transcoding the multi-channel signal into a binaural signal;
and the crosstalk elimination module is used for respectively eliminating crosstalk of the two-channel signals.
In a third aspect, an embodiment of the present application provides a storage medium having a computer program stored thereon, where the computer program is executed on a computer, so as to enable the computer to execute the stereo playing method provided in the first aspect of the present embodiment.
In a fourth aspect, an embodiment of the present application provides an electronic device for stereo playback, including two speakers, a processor, and a memory, where the processor is configured to execute, by invoking a computer program in the memory:
extracting a stereo signal with azimuth information in the audio signal;
decoding the stereo signal to obtain a multi-channel signal;
transcoding the multi-channel signal into a binaural signal;
and respectively carrying out crosstalk elimination on the two-channel signals and outputting the two-channel signals to the double loudspeakers for playing.
Because the embodiment of the application can transcode the multichannel signal into the double-channel signal and finally carry out crosstalk elimination on the double-channel signal with the stereo signal, the stereo playing effect can be achieved when the double loudspeakers play the audio.
The technical solutions and advantages of the present application will become apparent from the following detailed description of specific embodiments of the present application when taken in conjunction with the accompanying drawings.
Fig. 1 is a first flowchart of a stereo playback method according to an embodiment of the present application.
Fig. 2 is a second flowchart of a stereo playback method provided in an embodiment of the present application.
Fig. 3 is a schematic diagram of a first scenario of stereo playback provided in an embodiment of the present application.
Fig. 4 is a schematic diagram of a second scenario of stereo playback provided in an embodiment of the present application.
Fig. 5 is a schematic diagram of a first structure of a stereo playback apparatus according to an embodiment of the present application.
Fig. 6 is a schematic diagram of a second structure of a stereo playback apparatus according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of an electronic device for stereophonic sound playback according to an embodiment of the present application.
Referring to the drawings, wherein like reference numbers refer to like elements, the principles of the present application are illustrated as being implemented in a suitable computing environment. The following description is based on illustrated embodiments of the application and should not be taken as limiting the application with respect to other embodiments that are not detailed herein.
In the description that follows, specific embodiments of the present application will be described with reference to steps and symbols executed by one or more computers, unless otherwise indicated. Accordingly, these steps and operations will be referred to, several times, as being performed by a computer, the computer performing operations involving a processing unit of the computer in electronic signals representing data in a structured form. This operation transforms the data or maintains it at locations in the computer's memory system, which may be reconfigured or otherwise altered in a manner well known to those skilled in the art. The data maintains a data structure that is a physical location of the memory that has particular characteristics defined by the data format. However, while the principles of the application have been described in language specific to above, it is not intended to be limited to the specific form set forth herein, and it will be recognized by those of ordinary skill in the art that various of the steps and operations described below may be implemented in hardware.
The terms "first", "second", and "third", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to only those steps or modules listed, but rather, some embodiments may include other steps or modules not listed or inherent to such process, method, article, or apparatus.
With the continuous development of electronic equipment, such as electronic equipment like smart phones, dual speakers are arranged in part of the electronic equipment, so that when a user plays audio, the volume can be increased, and the effect of stereo playing can also be achieved. The scheme provided in the embodiment of the application can solve the problem of crosstalk phenomenon when the double loudspeakers play audio, and achieves a stereo playing effect when the double loudspeakers play audio.
In one embodiment, a stereo playback method is applied to an electronic device with two speakers, and the method includes:
extracting a stereo signal with azimuth information in the audio signal;
decoding the stereo signal to obtain a multi-channel signal;
transcoding the multi-channel signal into a binaural signal;
and respectively carrying out crosstalk elimination on the two-channel signals and outputting the two-channel signals to the double loudspeakers for playing.
In one embodiment, extracting a stereo signal having azimuth information in an audio signal includes:
judging whether the audio signal contains a stereo signal;
if not, the audio signal is coded to obtain the stereo signal with the azimuth information.
In an embodiment, transcoding the multi-channel signal into a binaural signal comprises:
constructing a virtual loudspeaker array based on the head-related transfer function;
and carrying out binaural transcoding on the virtual loudspeaker array signals.
In one embodiment, constructing a virtual speaker array based on a head-related transfer function includes:
constructing the positions of a plurality of virtual loudspeakers in space;
calculating audio signals of a plurality of the virtual speakers respectively based on a first formula, wherein the first formula is:
wherein, PiIs the audio signal of the ith virtual speaker, thetaiFor the azimuth of the i-th virtual speaker position in the horizontal plane XY,
for the azimuth angle of the ith virtual speaker position on the vertical plane YZ, d is a scaling factor and W is the channel signal.
In an embodiment, the binaural transcoding of the virtual speaker array signal comprises:
and performing binaural transcoding on the virtual speaker array signal based on a second formula to obtain a stereo signal of the binaural signal, where the second formula is:
where L is the left channel signal, R is the right channel signal, H is the head related transfer function, and P is the audio signal of the virtual speaker.
In an embodiment, the crosstalk cancellation of the binaural signal includes:
and enabling a left channel signal of the two-channel signal to pass through a high-pass filter, and enabling a right channel signal to pass through a low-pass filter, so as to eliminate crosstalk of the middle-low frequency signal.
In one embodiment, the crosstalk cancellation of the mid-low frequency signal includes:
performing crosstalk cancellation on the medium and low frequency signals based on a third formula, wherein the third formula is as follows:
where C is the cancellation matrix, G is the gain constant, LLPIs a left channel signal, L, passed through a low pass filterHPIs a left channel signal, R, passed through a high pass filterLPIs the right channel signal, R, passed through a low pass filterHPFor the right channel signal passing through a high-pass filter, LoutFor the output left channel signal, RoutIs the output right channel signal.
Referring to fig. 1, fig. 1 is a flowchart illustrating a stereo playing method according to an embodiment of the present application. The stereo playback method can be applied to an electronic device having dual speakers. The flow of the stereo playing method can comprise the following steps:
in 101, a stereo signal having orientation information in an audio signal is extracted.
When the electronic equipment plays audio, the audio file is opened in a network downloading or local storage mode, audio signals can be input at the moment, the audio file has multiple formats, the audio files in some formats contain stereo information, and after the electronic equipment receives the input audio signals, the audio signals can be extracted to obtain the stereo signals with direction information.
In 102, the stereo signal is decoded to obtain a multi-channel signal.
In one embodiment, the stereo playback effect may be a playback effect of multi-channel surround sound, since multi-channel surround sound has many different formats, such as, for example, the Dolby AC-3(Dolby Audio Code3) standard, the dts (digital television sound) standard. When playing audio, the audio files with different audio coding formats and the input audio signals are different, the stereo signals contained in the audio signals are decoded, and the multi-channel signals are obtained according to the decoded information.
In 103, the multi-channel signal is transcoded to obtain a two-channel signal.
Before transcoding, decoding the stereo signals to obtain virtual loudspeaker signals, then constructing a virtual loudspeaker array according to the virtual loudspeaker signals, wherein the position of the virtual loudspeaker array can be constructed based on a head-related transfer function, the position of the virtual loudspeaker can be in any place of a space where a human head is located, and finally, performing two-channel transcoding on the virtual loudspeaker array signals containing different channel information to finally obtain the two-channel signals with the stereo signals.
At 104, crosstalk cancellation is performed on the two-channel signals respectively and the two-channel signals are output to the two speakers for playing.
In one embodiment, the crosstalk cancellation is achieved by filtering the two-channel signals of different frequency bands, specifically, due to the shielding effect of the human head, when playing audio, the crosstalk phenomenon of a high-frequency signal is not obvious, and the crosstalk cancellation can be mainly performed on a medium-low frequency signal in the two-channel signals by passing a left-channel signal in the two-channel signals through a high-pass filter and passing a right-channel signal through a low-pass filter, and finally the two-channel signals with the crosstalk cancelled are output to a dual speaker for audio playing, so that the electronic device achieves the effect of stereo playing.
As can be seen from the above description, in the embodiment, the stereo signal in the audio signal is extracted, then the stereo signal is decoded, the decoded multi-channel signal is transcoded into the dual-channel signal, and finally the output dual-channel signal is subjected to crosstalk cancellation, and the dual-channel signal is output to the dual speakers, so that a better stereo playing effect can be achieved when the audio is played on the dual speakers.
Referring to fig. 2, fig. 2 is a second flowchart illustrating a stereo playing method according to an embodiment of the present application. The stereo playback method can be applied to an electronic device having dual speakers. The flow of the stereo playing method can comprise the following steps:
in 201, an input audio signal is acquired.
For example, a user may download an audio file online over a network using a mobile phone, and then obtain the input audio signal when playing the audio file, or the user may play the audio file on a local storage of the mobile phone to obtain the audio signal. Since there are many formats of audio files, for example, the audio files have MP3, WMA, APE, AAC, and the like, the audio signals input during audio playback are different.
At 202, it is determined whether the input audio signal contains a stereo signal, and if not, step 203 is performed.
It is understood that different audio signals contain different information, and some input audio signals contain stereo signals, the common stereo signals have formats such as B-Format, N3D, SN3D, etc., and the stereo signals contain azimuth information, but some audio signals do not contain stereo signals.
The stereo signal contains orientation information, for example, the stereo signal may have orientation information of a plurality of positions in a virtual three-dimensional space, and it is understood that in the three-dimensional virtual space, when the virtual speakers play audio, the human ears in the three-dimensional virtual space may receive sound emitted from the virtual speakers at the respective positions.
In the next step, it is necessary to first determine whether the input audio signal contains a stereo signal, if the input audio signal contains a stereo signal, step 204 is executed, and if the input audio signal does not contain a stereo signal, step 203 is executed.
In 203, the input audio signal is encoded.
When it is determined that the input audio signal does not contain a stereo signal, the audio signal needs to be encoded. In an embodiment, in case the audio signal does not contain a stereo signal, it is understood that the audio signal only contains a mono audio signal, in which case the audio signal with the stereo signal can be encoded by setting the spatial parameters, by combining the set stereo parameters and the mono audio signal.
As shown in fig. 3, fig. 3 is a schematic view of a stereo playback scene provided by this embodiment, for example, an input audio signal may be encoded into an audio signal having a stereo signal, where the stereo signal may be in a Format such as B-Format, N3D, and SN3D, and specifically, the stereo signal in a first-order B-Format may be encoded as follows:
theta in figure 3 is the azimuth angle of the virtual loudspeaker position in the horizontal plane XY,
is the azimuth angle of the virtual loudspeaker position in the vertical plane YZ. Then in the formula, thetaiFor the azimuth of the virtual loudspeaker position in the horizontal plane XY,
for virtual loudspeakingAzimuth angle of the device position on vertical plane YZ, where siFor the ith audio signal, i is (1,2 … k) the number of audio signals, the W-channel signal represents an omnidirectional sound signal, and the X-channel signal, the Y-channel signal, and the Z-channel signal each represent three spatial sound signals oriented perpendicular to each other.
Through the formula, the input audio signal can be finally encoded into an audio signal having a stereo signal, and in this embodiment, the encoded stereo signal may be a first-order B-Format stereo signal.
In 204, a virtual loudspeaker array is constructed and the stereo signal with the orientation information is decoded.
It will be appreciated that the virtual loudspeaker array comprises a plurality of virtual loudspeakers, which are positioned at different locations in a virtual three-dimensional virtual space, and the stereo signal with the orientation information is decoded so that the signals of the virtual loudspeaker array have the orientation information, and finally the virtual loudspeaker array is constructed in the three-dimensional virtual space.
In one embodiment, stereo signals in formats such as B-Format, N3D, etc. may be decoded into a plurality of virtual speaker signals for playing, and at this time, a person is in a virtual three-dimensional space played by the virtual speakers, and receives sounds emitted by the virtual speakers, thereby implementing stereo playing.
For example, referring to fig. 3, fig. 3 is a schematic view of a stereo playing scene provided in this embodiment, where the virtual three-dimensional space is a cube shape, and may also be a space of other shapes, in this embodiment, a cube virtual three-dimensional space is taken as an example, at this time, a person is located at the center of the virtual three-dimensional space, the mobile phone is placed right in front of the head of the person, L1 and R1 are the left speaker and the right speaker of the mobile phone, respectively, θ is an azimuth angle of the virtual speaker position on the horizontal plane XY,
the azimuth angle of the virtual loudspeaker position on the vertical plane YZ is shown at 10, 20, 30, 40, 50, 60, 70, 80The positions of the virtual speakers at different positions in the virtual three-dimensional space may be created based on the head-related transfer function, or may be created in other ways. Decoding the stereo signal in B-Format into 8 virtual speaker signals for playback, the spatial positions of the 8 virtual speakers being (45 °, 30 °), (-45 °, 30 °), (135 °, 30 °), (-135 °, 30 °), (45 °, -30 °), (-45 °, -30 °), (135 °, (-30 °), and (-135 °, -30 °), respectively. Specifically, playback is performed according to the formula:
wherein, PiFor the playback signal of the ith virtual speaker, i ═ 1,2 … 8, θiFor the azimuth of the virtual loudspeaker position in the horizontal plane XY,
the azimuth angle of the virtual speaker position on the vertical plane YZ is shown, the W channel signal represents an omnidirectional sound signal, d is a proportionality coefficient, and the value range is 0-2, in this embodiment, the recommended value is 1. The resulting virtual loudspeaker array signal can be represented as:
in 205, the decoded multi-channel signal is transcoded into a two-channel signal.
In one embodiment, the virtual speaker array positions may be constructed based on a head related transfer function HRTF, and a binaural output stereo signal may be obtained by performing binaural transcoding on a multichannel virtual speaker array signal. According to the virtual loudspeaker array signals obtained in the previous step, each virtual loudspeaker corresponds to a head-related transfer function (HRTF) of a corresponding spatial angle, and the head-related impulse response (HRIR) is obtained in a time domain, so that the stereo signals of two channels are as follows:
where L, R are indicated as left and right channel signals, respectively, H is the head related transfer function and P is the playback signal of the virtual loudspeaker.
At 206, crosstalk cancellation is performed on the binaural signal.
When the dual speakers play audio, if the two speakers are in close proximity, crosstalk will occur, and at this time, crosstalk cancellation processing needs to be performed on the input two-channel signals, so that when the dual speakers play audio, there is no crosstalk.
Referring to fig. 4, fig. 4 is a schematic view of a stereo playing scene provided in the present embodiment, wherein in fig. 4, H isLL、H RR、H RLAnd HLRIs a head related transfer function HRTF, 1 is a left loudspeaker of the mobile phone, 2 is a right loudspeaker of the mobile phone, 3 is a left ear of a human, 4 is a right ear of the human, when the double loudspeakers of the mobile phone play audio, the left loudspeaker and the right loudspeaker can both emit sound, the human ears can receive the sound emitted by the two loudspeakers, under the condition of not processing the audio signal, because the distance between the two loudspeakers is very close, when the mobile phone is horizontally placed to play audio, when the ear receives the sound emitted by the loudspeaker on the same side, the ear also receives the sound emitted by the other loudspeaker, which is the crosstalk phenomenon, after the crosstalk elimination processing is carried out on the input audio signal, when the double loudspeakers of the mobile phone are used for playing the audio, the crosstalk phenomenon can not occur, the position of the loudspeaker of the mobile phone in the figure can be other positions, and the form of the mobile phone can be adjusted according to the actual production and use.
In one embodiment, the sound heard by the human ear from the handset's dual speakers can be expressed as:
wherein HLL、H RR、H RLAnd HLRIs a head related transfer function HRTF. In order to eliminate crosstalk, so that the sound emitted from the left channel and the sound emitted from the right channel do not generate crosstalk when they are transmitted into the human ear, a cancellation matrix C is created so that
In reality, because of the shielding effect of the human head, the crosstalk phenomenon of the high-frequency signal is not obvious, in this embodiment, the left channel signal and the right channel signal of the binaural signal respectively pass through the high-pass filter and the low-pass filter, and mainly perform crosstalk elimination on the mid-frequency and low-frequency signals:
wherein G is a gain constant, LLPIs a left channel signal, L, passed through a low pass filterHPIs a left channel signal, R, passed through a high pass filterLPIs the right channel signal, R, passed through a low pass filterHPFor the right channel signal passing through a high-pass filter, LoutFor the output left channel signal, RoutFrequency dividing point f of filter used for output right channel signal0The range of the desirable value is 3500-5500 Hz, and the value in the embodiment is 4000 Hz.
According to the process, the input two-channel signals are processed, and the effect of eliminating crosstalk of the two-channel signals is achieved.
In 207, an audio signal is input to the dual speaker for playback.
After the step of crosstalk elimination is completed, the two-channel signal is input to the double loudspeakers, and when the double loudspeakers play audio, the crosstalk phenomenon is eliminated, so that the effect of stereo playing is realized.
Therefore, in the embodiment of the application, whether the input audio signal has a stereo signal is judged by judging the input audio signal, if the input audio signal has the stereo signal, a virtual speaker array is constructed, the stereo signal with the direction information is decoded, if the input audio signal does not have the stereo signal, the audio signal is encoded to enable the audio signal to have the stereo signal, then a virtual speaker array is constructed, the stereo signal with the direction information is decoded, then the decoded multi-channel signal is transcoded into a dual-channel signal, crosstalk cancellation is performed on the transcoded dual-channel signal, the audio signal is input to a dual speaker to be played, and the effect of stereo playing is achieved.
In one embodiment, a stereo playback apparatus includes:
the extraction module is used for extracting a stereo signal with azimuth information in the audio signal;
the decoding module is used for decoding the stereo signal to obtain a multi-channel signal;
a transcoding module for transcoding the multi-channel signal into a binaural signal;
and the crosstalk elimination module is used for respectively eliminating crosstalk of the two-channel signals.
In one embodiment, the extraction module comprises:
the judgment submodule is used for judging whether the audio signal contains a stereo signal;
and the coding submodule is used for coding the audio signal to obtain the stereo signal with the azimuth information when the judgment submodule judges that the audio signal is not the stereo signal with the azimuth information.
In one embodiment, the transcoding module comprises:
an array construction submodule for constructing a virtual speaker array based on the head-related transfer function;
and the transcoding submodule is specifically used for performing binaural transcoding on the virtual loudspeaker array signal.
In an embodiment, the array construction sub-module is specifically configured to construct positions of a plurality of virtual speakers in space;
calculating audio signals of a plurality of the virtual speakers respectively based on a first formula, wherein the first formula is:
wherein, PiIs the audio signal of the ith virtual speaker, thetaiFor the azimuth of the i-th virtual speaker position in the horizontal plane XY,
for the azimuth angle of the ith virtual speaker position on the vertical plane YZ, d is a scaling factor and W is the channel signal.
In one embodiment, the crosstalk cancellation module includes:
and the filtering submodule is used for enabling a left channel signal of the two-channel signal to pass through a high-pass filter and a right channel signal to pass through a low-pass filter so as to eliminate crosstalk between the middle-frequency signal and the low-frequency signal.
Referring to fig. 5, fig. 5 is a stereo playback apparatus provided in an embodiment of the present application, where the stereo playback apparatus 500 is applied to an electronic device with two speakers, and the stereo playback apparatus 500 includes an extracting module 501, a decoding module 502, a transcoding module 503, and a crosstalk cancellation module 504.
The extracting module 501 is configured to extract a stereo signal with azimuth information from an audio signal.
Specifically, when a user plays audio using the electronic device, an audio file is opened by means of network downloading or local storage, an audio signal is input at this time, the audio file has a plurality of formats, for example, the audio file has a format such as MP3, WMA, APE, AAC, and the like, some formats of the audio file contain stereo information, and after receiving the input audio signal, the electronic device extracts the audio signal by the extraction module 501, so as to obtain the stereo signal with the orientation information.
A decoding module 502, configured to decode the stereo signal to obtain a multi-channel signal.
The decoding module 502 decodes the Format stereo signals such as B-Format, N3D, SN3D, etc. to obtain multi-channel signals, it is understood that the multi-channel signals may be emitted from virtual speakers at different positions in the virtual three-dimensional space.
A transcoding module 503, configured to transcode the multichannel signal into a binaural signal.
In one embodiment, the virtual speaker array positions may be constructed based on a head related transfer function HRTF, and a binaural output stereo signal may be obtained by performing binaural transcoding on a multichannel virtual speaker array signal.
It should be noted that after transcoding the multi-channel signal, the obtained two-channel signal is a stereo signal, and the multi-channel signal can be understood as an audio signal emitted by a plurality of virtual speakers.
And a crosstalk elimination module 504, configured to perform crosstalk elimination on the two-channel signals respectively and output the two-channel signals to the dual speakers for playing.
In one embodiment, the crosstalk cancellation is achieved by filtering the two-channel signals of different frequency bands, specifically, due to the shielding effect of the human head, when playing audio, the crosstalk phenomenon of a high-frequency signal is not obvious, and the crosstalk cancellation can be mainly performed on a medium-low frequency signal in the two-channel signals by passing a left-channel signal in the two-channel signals through a high-pass filter and passing a right-channel signal through a low-pass filter, and finally the two-channel signals with the crosstalk cancelled are output to a dual speaker for audio playing, so that the electronic device achieves the effect of stereo playing.
Referring to fig. 6, fig. 6 is another schematic structural diagram of a stereo playback apparatus according to an embodiment of the present disclosure, in which the stereo playback apparatus 500 is applied to an electronic device with two speakers. In some embodiments, the extraction module 501 may include a determination submodule 5011 and an encoding submodule 5012.
The determining module 5011 is configured to determine whether the audio signal contains a stereo signal.
In the input audio signal, some audio signals do not include a stereo signal having azimuth information, a judgment needs to be made on the input audio signal, and if the input audio signal does not have a stereo signal, the encoding submodule 5012 needs to continue to perform the next step.
The encoding submodule 5012 is configured to encode the audio signal not containing the stereo signal to obtain the stereo signal with the azimuth information.
When it is determined that the input audio signal does not contain a stereo signal, the audio signal needs to be encoded. In an embodiment, in case the audio signal does not contain a stereo signal, it is understood that the audio signal only contains a mono audio signal, in which case the audio signal with the stereo signal can be encoded by setting the spatial parameters, by combining the set stereo parameters and the mono audio signal.
In some embodiments, transcoding module 503 includes an array building sub-module 5031 and a transcoding sub-module 5032.
The array construction sub-module 5031 is configured to construct a virtual speaker array based on the head-related transfer function.
It will be appreciated that the virtual loudspeaker array comprises a plurality of virtual loudspeakers, which are positioned at different locations in a virtual three-dimensional virtual space, and the stereo signal with the orientation information is decoded so that the signals of the virtual loudspeaker array have the orientation information, and finally the virtual loudspeaker array is constructed in the three-dimensional virtual space.
The transcoding sub-module 5032 is specifically configured to perform binaural transcoding on the virtual speaker array signal.
In one embodiment, stereo signals in formats such as B-Format, N3D, etc. may be decoded into a plurality of virtual speaker signals for playing, and at this time, a person is in a virtual three-dimensional space played by the virtual speakers, and receives sounds emitted by the virtual speakers, thereby implementing stereo playing.
In some embodiments, the crosstalk cancellation module 504 includes a filtering module 5041 configured to pass a left channel signal and a right channel signal of the two-channel signal through a high pass filter and a low pass filter, respectively.
Specifically, the binaural signal generated after transcoding needs to be filtered, and the crosstalk phenomenon does not occur in the output binaural signal when the dual speakers are played.
It should be noted that, in the present application, when it is determined that an input audio signal does not have a stereo signal, the audio signal may be encoded into an audio signal including stereo signals of multiple formats, and when a multichannel signal is transcoded into a binaural signal, transcoding may be performed according to a preset transcoding manner, for example, spatial information included in the multichannel signal is utilized, and in a final crosstalk cancellation step, in the embodiment of the present application, a purpose of crosstalk cancellation is achieved by filtering a middle-low frequency signal, specifically, real-time adjustment of the binaural signal may be performed according to a placement manner of a mobile phone, and no limitation is imposed on the present application.
Therefore, in the embodiment of the application, whether the input audio signal has a stereo signal is judged by judging the input audio signal, if the input audio signal has the stereo signal, a virtual speaker array is constructed, the stereo signal with the direction information is decoded, if the input audio signal does not have the stereo signal, the audio signal is encoded to enable the audio signal to have the stereo signal, then a virtual speaker array is constructed, the stereo signal with the direction information is decoded, then the decoded multi-channel signal is transcoded into a dual-channel signal, crosstalk cancellation is performed on the transcoded dual-channel signal, the audio signal is input to a dual speaker to be played, and the effect of stereo playing is achieved.
In the embodiment of the present application, the stereo playing apparatus and the stereo playing method in the above embodiments belong to the same concept, and any method provided in the stereo playing method embodiment may be run on the stereo apparatus, and the specific implementation process thereof is described in detail in the embodiment of the stereo playing method, and will not be described herein again.
The term "module" as used herein may be considered a software object executing on the computing system. The different components, modules, engines, and services described herein may be considered as implementation objects on the computing system. The apparatus and method described herein may be implemented in software, but may also be implemented in hardware, and are within the scope of the present application.
Embodiments of the present application also provide a storage medium having a computer program stored thereon, which, when running on a computer, causes the computer to execute the above-mentioned stereo playback method.
The embodiment of the application also provides electronic equipment, such as a tablet computer, a mobile phone and other electronic equipment. The processor in the electronic device loads instructions corresponding to processes of one or more application programs into the memory according to the following steps, and the processor runs the application programs stored in the memory, so that various functions are realized:
extracting a stereo signal with azimuth information in the audio signal;
decoding the stereo signal to obtain a multi-channel signal;
transcoding the multi-channel signal into a binaural signal;
and respectively carrying out crosstalk elimination on the two-channel signals and outputting the two-channel signals to the double loudspeakers for playing.
In an embodiment, when extracting a stereo signal having azimuth information in an audio signal, the processor is configured to perform the following steps:
judging whether the audio signal contains a stereo signal;
if not, the audio signal is coded to obtain the stereo signal with the azimuth information.
In an embodiment, the processor is configured to perform the following steps in transcoding the multichannel signal into a binaural signal:
constructing a virtual loudspeaker array based on the head-related transfer function;
and carrying out binaural transcoding on the virtual loudspeaker array signals.
In one embodiment, the processor is configured to perform the following steps in constructing the virtual speaker array based on the head related transfer function:
constructing the positions of a plurality of virtual loudspeakers in space;
calculating audio signals of a plurality of the virtual speakers respectively based on a first formula, wherein the first formula is:
wherein, PiIs the audio signal of the ith virtual speaker, thetaiFor the azimuth of the i-th virtual speaker position in the horizontal plane XY,
for the azimuth angle of the ith virtual speaker position on the vertical plane YZ, d is a scaling factor and W is the channel signal.
In one embodiment, when the virtual speaker array signal is transcoded for two channels, the processor is configured to perform the following steps:
and performing binaural transcoding on the virtual speaker array signal based on a second formula to obtain a stereo signal of the binaural signal, where the second formula is:
where L is the left channel signal, R is the right channel signal, H is the head related transfer function, and P is the audio signal of the virtual speaker.
In one embodiment, when performing crosstalk cancellation on the mid-low frequency signals, the processor is configured to perform the following steps:
performing crosstalk cancellation on the medium and low frequency signals based on a third formula, wherein the third formula is as follows:
where C is the cancellation matrix, G is the gain constant, LLPIs a left channel signal, L, passed through a low pass filterHPIs a left channel signal, R, passed through a high pass filterLPIs the right channel signal, R, passed through a low pass filterHPFor the right channel signal passing through a high-pass filter, LoutFor the output left channel signal, RoutIs the output right channel signal.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an electronic device for stereo playback according to an embodiment of the present invention. The electronic device 700 includes: a processor 701, a display 702, a memory 703, radio frequency circuitry 704, an audio module 705, and a power supply 706.
The processor 701 is a control center of the electronic device 700, connects various parts of the whole electronic device by using various interfaces and lines, executes various functions of the electronic device 700 by running or loading a computer program stored in the memory 702 and calling data stored in the memory 702, and processes the data, thereby performing overall monitoring of the electronic device 700.
The memory 702 may be used to store software programs and modules, and the processor 701 executes various functional applications and data processing by operating the computer programs and modules stored in the memory 702. The memory 702 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, a computer program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data created according to use of the electronic device, and the like. Further, the memory 702 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, the memory 702 may also include a memory controller to provide the processor 701 with access to the memory 702.
In this embodiment, the processor 701 in the electronic device 700 loads instructions corresponding to one or more processes of the computer program into the memory 702 according to the following steps, and the processor 701 executes the computer program stored in the memory 702, thereby implementing various functions as follows:
the method comprises the steps of obtaining an input audio signal, extracting a stereo signal with azimuth information in the input audio signal, if the input audio signal does not have the stereo signal, encoding the input audio signal to enable the input audio signal to have the stereo signal, then decoding the audio signal with the stereo signal to obtain a multi-channel signal, creating a virtual loudspeaker array by utilizing a head-related transfer function, transcoding the multi-channel signal into a two-channel signal with the stereo signal, then carrying out crosstalk elimination on the two-channel signal, and finally outputting the two-channel signal subjected to the crosstalk elimination to two loudspeakers for playing, so that the effect of playing the stereo is realized when the electronic equipment plays the audio.
The display 703 may be used to display information entered by or provided to the user as well as various graphical user interfaces, which may be comprised of graphics, text, icons, video, and any combination thereof. The Display 703 may include a Display panel, and in some embodiments, the Display panel may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.
The radio frequency circuit 704 may be used for transceiving radio frequency signals to establish wireless communication with a network device or other electronic devices through wireless communication, and to transceive signals with the network device or other electronic devices.
The audio module 705 includes a dual speaker and an audio circuit. The audio circuit can transmit the electric signal converted from the received audio data to the double loudspeakers, and the electric signal is converted into a sound signal by the double loudspeakers to be output; on the other hand, the microphone converts the collected sound signal into an electrical signal, which is received by the audio circuit and converted into audio data, and the audio data is processed by the audio data output processor 701 and then transmitted to another terminal via the radio frequency circuit 704, or the audio data is output to the memory 702 for further processing. The audio circuit may also include an earbud jack to provide communication of a peripheral headset with the terminal.
The power supply 706 may be used to power various components of the electronic device 700. In some embodiments, the power supply 706 may be logically coupled to the processor 701 through a power management system, such that the power management system may perform functions of managing charging, discharging, and power consumption.
Although not shown in fig. 7, the electronic device 700 may further include a camera, a bluetooth module, and the like, which are not described herein.
In the embodiment of the present application, the storage medium may be a magnetic disk, an optical disk, a Read Only Memory (ROM), a Random Access Memory (RAM), or the like.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It should be noted that, for the stereo playing method of the embodiment of the present application, it can be understood by a person skilled in the art that all or part of the process for implementing the user gender prediction method of the embodiment of the present application can be implemented by controlling related hardware through a computer program, the computer program can be stored in a computer readable storage medium, such as a memory of an electronic device, and executed by at least one processor in the electronic device, and the process of executing the computer program can include the process of the embodiment of the user gender prediction method. The storage medium may be a magnetic disk, an optical disk, a read-only memory, a random access memory, etc.
For the stereo playing device of the embodiment of the present application, each functional module may be integrated into one processing chip, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, or the like.
The foregoing describes in detail a stereo playing method, device, storage medium and electronic device provided in the embodiments of the present application, and specific examples are applied herein to explain the principles and implementations of the present application, and the descriptions of the foregoing embodiments are only used to help understand the method and core ideas of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (20)
- A stereo playing method is applied to an electronic device, the electronic device comprises two loudspeakers, and the method comprises the following steps:extracting a stereo signal with azimuth information in the audio signal;decoding the stereo signal to obtain a multi-channel signal;transcoding the multi-channel signal into a binaural signal;and respectively carrying out crosstalk elimination on the two-channel signals and outputting the two-channel signals to the double loudspeakers for playing.
- The stereo playback method as defined in claim 1, wherein extracting the stereo signal having the azimuth information from the audio signal comprises:judging whether the audio signal contains a stereo signal;if not, the audio signal is encoded to obtain the stereo signal with the azimuth information.
- The stereo playback method as defined in claim 1, wherein transcoding the multi-channel signal into a two-channel signal comprises:constructing a virtual loudspeaker array based on the head-related transfer function;and carrying out binaural transcoding on the virtual loudspeaker array signals.
- The stereo playback method as defined in claim 3, wherein constructing the virtual speaker array based on the head-related transfer function comprises:constructing the positions of a plurality of virtual loudspeakers in space;calculating audio signals of a plurality of the virtual speakers respectively based on a first formula, wherein the first formula is:
wherein, PiIs the audio signal of the ith virtual speaker, thetaiFor the azimuth of the i-th virtual speaker position in the horizontal plane XY,for the azimuth angle of the ith virtual speaker position on the vertical plane YZ, d is a scaling factor and W is the channel signal.
- The stereo playback method as defined in claim 4, wherein the binaural transcoding of the virtual speaker array signal comprises:and performing binaural transcoding on the virtual speaker array signal based on a second formula to obtain a stereo signal of the binaural signal, where the second formula is:
where L is the left channel signal, R is the right channel signal, H is the head related transfer function, and P is the audio signal of the virtual speaker. - The method of stereo playback according to any of claims 1 to 5, wherein said cross-talk cancellation of the two-channel signal comprises:and enabling a left channel signal of the two-channel signal to pass through a high-pass filter, and enabling a right channel signal to pass through a low-pass filter, so as to eliminate crosstalk of the middle-low frequency signal.
- The method of stereo playback as defined in claim 6, wherein the crosstalk cancellation of the mid-low frequency signals comprises:performing crosstalk cancellation on the medium and low frequency signals based on a third formula, wherein the third formula is as follows:
where C is the cancellation matrix, G is the gain constant, LLPIs a left channel signal, L, passed through a low pass filterHPIs a left channel signal, R, passed through a high pass filterLPIs the right channel signal, R, passed through a low pass filterHPFor the right channel signal passing through a high-pass filter, LoutFor the output left channel signal, RoutIs the output right channel signal. - A stereo playing device applied to an electronic device comprising two loudspeakers, comprises:the extraction module is used for extracting a stereo signal with azimuth information in the audio signal;the decoding module is used for decoding the stereo signal to obtain a multi-channel signal;a transcoding module for transcoding the multi-channel signal into a binaural signal;and the crosstalk elimination module is used for respectively eliminating crosstalk of the two-channel signals and outputting the two-channel signals to the double loudspeakers for playing.
- The stereo playback device according to claim 8, wherein the extraction module includes:the judgment submodule is used for judging whether the audio signal contains a stereo signal;and the coding submodule is used for coding the audio signal to obtain the stereo signal with the azimuth information when the judgment submodule judges that the audio signal is not the stereo signal with the azimuth information.
- The stereo playback device of claim 8, wherein the transcoding module comprises:an array construction submodule for constructing a virtual speaker array based on the head-related transfer function;and the transcoding submodule is specifically used for performing binaural transcoding on the virtual loudspeaker array signal.
- The stereo playback device of claim 10,the array construction submodule is specifically used for constructing the positions of a plurality of virtual loudspeakers in the space;calculating audio signals of a plurality of the virtual speakers respectively based on a first formula, wherein the first formula is:
wherein, PiIs the audio signal of the ith virtual speaker, thetaiFor the azimuth of the i-th virtual speaker position in the horizontal plane XY,for the azimuth angle of the ith virtual speaker position on the vertical plane YZ, d is a scaling factor and W is the channel signal.
- The stereo playback device of claim 8, wherein the crosstalk cancellation module comprises:and the filtering submodule is used for enabling a left channel signal of the two-channel signal to pass through a high-pass filter and a right channel signal to pass through a low-pass filter so as to eliminate crosstalk between the middle-frequency signal and the low-frequency signal.
- A storage medium having stored thereon a computer program, wherein the computer program, when executed on a computer, causes the computer to perform the method of any one of claims 1 to 7.
- An electronic device for stereophonic sound reproduction comprising dual speakers, a processor and a memory, wherein said processor is adapted to execute, by invoking a computer program in said memory:extracting a stereo signal with azimuth information in the audio signal;decoding the stereo signal to obtain a multi-channel signal;transcoding the multi-channel signal into a binaural signal;and respectively carrying out crosstalk elimination on the two-channel signals and outputting the two-channel signals to the double loudspeakers for playing.
- The stereo playback device according to claim 14, wherein the processor is configured to perform, when extracting a stereo signal having orientation information from the audio signal:judging whether the audio signal contains a stereo signal;if not, the audio signal is coded to obtain the stereo signal with the azimuth information.
- The stereo playback device of claim 14, wherein, in transcoding the multi-channel signal into a binaural signal, the processor is configured to perform:constructing a virtual loudspeaker array based on the head-related transfer function;and carrying out binaural transcoding on the virtual loudspeaker array signals.
- The stereo playback device according to claim 16, wherein the processor is configured to perform, in constructing the virtual speaker array based on the head-related transfer function:constructing the positions of a plurality of virtual loudspeakers in space;calculating audio signals of a plurality of the virtual speakers respectively based on a first formula, wherein the first formula is:
wherein, PiIs the audio signal of the ith virtual speaker, thetaiFor the azimuth of the i-th virtual speaker position in the horizontal plane XY,for the azimuth angle of the ith virtual speaker position on the vertical plane YZ, d is a scaling factor and W is the channel signal.
- The stereo playback device of claim 17, wherein the processor, in binaural transcoding of the virtual speaker array signal, is configured to perform:performing crosstalk cancellation on the low and medium frequency signals based on a second formula, wherein the second formula is as follows:
where L is the left channel signal, R is the right channel signal, H is the head related transfer function, and P is the audio signal of the virtual speaker. - The stereo playback device according to claims 14 to 18, wherein the crosstalk cancellation of the two-channel signal comprises:and enabling a left channel signal of the two-channel signal to pass through a high-pass filter, and enabling a right channel signal to pass through a low-pass filter, so as to eliminate crosstalk of the middle-low frequency signal.
- The stereo playback device of claim 19, wherein, in cross-talk cancellation of the mid-low frequency signals, the processor is configured to perform:performing crosstalk cancellation on the medium and low frequency signals based on a third formula, wherein the third formula is as follows:
where C is the cancellation matrix, G is the gain constant, LLPIs a left channel signal, L, passed through a low pass filterHPIs a left channel signal, R, passed through a high pass filterLPIs the right channel signal, R, passed through a low pass filterHPFor the right channel signal passing through a high-pass filter, LoutFor the output left channel signal, RoutIs the output right channel signal.
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| PCT/CN2018/117642 WO2020107201A1 (en) | 2018-11-27 | 2018-11-27 | Stereo sound playback method and device, storage medium and electronic device |
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