TWI757873B - Electronic apparatus and sound field balancing method thereof for dual-channel - Google Patents

Abstract

An electronic apparatus and a sound field balancing method thereof for dual-channel are provided. In the method, a space delay time between two speakers relative to two audio receivers in the space is determined, a representative frequency is determined according to the human auditory characteristic, an intra delay time of two speakers inside the system is determined according to the representative frequency, and overall delay time is determined according to the space and intra delay times. The space delay is related to the locations of the two speakers at the electronic apparatus. The intra delay time is related to phase shifts of representative frequency based on the reception of the outputs of the two speakers. The overall delay is used to correct the delay time of the output of the two speakers. Accordingly, the delay time for fixing the balance can be obtained quickly.

Description

Electronic device and method for balancing two-channel sound field

The present invention relates to a sound field control technology, and in particular, to an electronic device and a method for balancing the two-channel sound field.

For electronic devices with two channels (for example, notebook computers, All-in-One (AIO) computers, or smart phones, etc.), although the sound outlets of the speakers are on the symmetrical sides of the body, the Due to the difference between the speaker unit and the internal design of the mechanism, the frequency responses of the left and right channel signals are inconsistent, and the sound direction deviates from the center position. Although the two-channel equalization (EQ) gains can be adjusted individually to make the signal strengths received by the microphones very close, the sound field that the user actually feels in front of the electronic device still deviates. In addition, if only the phase offset of each frequency band is adjusted, the absolute value difference of the sound pressure difference of each frequency band will increase instead, which is not conducive to subsequent sound effect processing (eg, Dolby or DTS). If each machine is to be calibrated at the factory before shipment, how to quickly adjust for individual machines and obtain accurate results is a major challenge for manufacturers.

In view of this, the embodiments of the present invention provide an electronic device and a method for balancing the two-channel sound field. Combining two microphones and obtaining an appropriate overall delay time based on the delay time of both the space and the system, it is possible to quickly obtain a dual-channel sound field balance. The signal sound pressure of the channel reaches a more balanced state.

The method for balancing the two-channel sound field according to the embodiment of the present invention is applicable to an electronic device including two speakers and two radios. The two-channel sound field balance method includes (but is not limited to) the following steps: determining the spatial delay time of the two speakers relative to the two receivers, and the spatial delay time is relative to the positions of the two speakers in the electronic device. The representative frequency is determined according to the human hearing characteristic, and the human hearing characteristic is related to the sensitivity to different frequencies. The internal delay time of the difference between the two speakers in the electronic device is determined according to the representative frequency, and the internal delay time is related to the phase shift at the representative frequency obtained by collecting the two speakers through the two receivers. The overall delay time is determined according to the spatial delay time and the internal delay time, and the overall delay time is used to correct the delay time difference between the sound played by the two speakers.

The electronic device of the embodiment of the present invention includes (but is not limited to) two speakers and a processor. The processor is coupled to the two speakers, and loads and executes several modules. These modules include a spatial delay estimation module, a representative frequency determination module, an internal delay estimation module, and an overall delay estimation module. The spatial delay estimation module determines the spatial delay time of the two speakers relative to the two receivers, and the spatial delay time is related to the positions of the two speakers respectively in the electronic device. The representative frequency determination module determines the representative frequency according to the human hearing characteristic, and the human hearing characteristic is related to the sensitivity to different frequencies. The internal delay estimation module determines the internal delay time of the difference between the two speakers in the electronic device according to the representative frequency, and the internal delay time is related to the phase shift at the representative frequency obtained by collecting the two speakers through the two receivers. The overall delay estimation module determines the overall delay time according to the spatial delay time and the internal delay time, and the overall delay time is used to correct the delay time difference between the sound played by the two speakers.

Based on the above, the electronic device and the method for balancing the two-channel sound field in the embodiment of the present invention integrate the positions of the two speakers and the delay time caused by the transmission of the sound inside the system, as the difference between the sound of the two speakers in the electronic device. The overall delay time, thereby narrowing the overall sound pressure gap. In addition, the embodiment of the present invention further combines dual radios and a single representative frequency to reduce the detection delay time.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

FIG. 1 is a block diagram of an electronic device 100 according to an embodiment of the present invention. Referring to FIG. 1 , the electronic device 100 may be a notebook computer, an AIO computer, a mobile phone, a tablet computer, a smart speaker, or a smart TV. Electronic devices include, but are not limited to, speakers 110 , 115 , radios 120 , 125 , storage 130 , and processor 150 .

Speakers 110, 115 may be speakers or loudspeakers. In one embodiment, the speakers 110 and 115 are respectively corresponding to the left and right channels (for example, disposed on the left and right sides of the electronic device 100 ) to form two-channel speakers.

The microphones 120 and 125 may be dynamic, condenser, or electret condenser microphones. A combination of electronic components, analog-to-digital converters, filters, and audio processors that convert them into sound signals. In one embodiment, the position of the receiver 120 is closer to the left side of the electronic device 100 than the receiver 125 , and the position of the receiver 125 is closer to the right side of the electronic device 100 than the receiver 120 .

The storage 130 may be any type of fixed or removable random access memory (RAM), read only memory (ROM), flash memory, conventional hard disks (Hard Disk Drive, HDD), Solid-State Drive (Solid-State Drive, SSD) or similar components. In one embodiment, the storage 130 is used to record code, software modules (eg, the spatial delay estimation module 131, the representative frequency determination module 133, the internal delay estimation module 135, and the overall delay estimation module 131). 137, etc.), sound signal, weight, delay time, distance, position offset, phase offset, and other data or files, the details of which will be described in detail in subsequent embodiments.

The processor 150 is coupled to the speakers 110, 115, the radios 120, 125, and the storage 130, and the processor 150 can be a central processing unit (Central Processing Unit, CPU), or other programmable general-purpose or special-purpose microprocessors (Microprocessor), digital signal processor (Digital Signal Processor, DSP), programmable controller, application-specific integrated circuit (Application-Specific Integrated Circuit, ASIC) or other similar components or a combination of the above components. In one embodiment, the processor 150 is used to execute all or part of the operations of the electronic device 100 , and can load and execute various software modules, files and data recorded in the storage 130 .

Hereinafter, the method according to the embodiment of the present invention will be described in conjunction with various devices, components and modules in the electronic device 100 . Each process of the method can be adjusted according to the implementation situation, and is not limited to this.

FIG. 2 is a flowchart of a method for balancing a two-channel sound field according to an embodiment of the present invention. Referring to FIG. 2, the spatial delay estimation module 131 determines the spatial delay time of the two speakers 110, 115 relative to the two receivers 120, 125 (step S210). Specifically, the spatial delay time is related to the delay time caused by the two speakers 110 and 115 being located at specific positions of the electronic device 100 respectively. If the positions of the two-channel speakers 110 and 115 are not completely symmetrical with respect to the body of the electronic device 100 , the user may perceive the unbalanced sound field phenomenon of the two-channel unsynchronized.

In one embodiment, the spatial delay estimation module 131 forms a virtual microphone between the positions of the two microphones 120 , 125 . For example, a virtual microphone is located at the center point of an imaginary line connecting the positions of the two microphones 120, 125.

,

,

)，揚聲器115的位置PSR的座標為(

,

,

)。此外，假設虛擬收音器所在的收音位置PVM位於收音器120,125的位置PM1,PM2(對應於座標(

,

,

)及(

,

,

)的)的中間，且收音位置PVM的座標為(

,

,

)。 For example, FIG. 3 is an example illustrating the positional relationship. Referring to FIG. 3 , assuming that the space where the electronic device 100 is located forms a coordinate system of three orthogonal axes x , y , and z , the coordinates of the position PSL of the speaker 110 are (

,

,

), the coordinates of the position PSR of the speaker 115 are (

,

,

). In addition, it is assumed that the pickup position PVM where the virtual microphone is located is located at the positions PM1 and PM2 of the microphones 120 and 125 (corresponding to the coordinates (

,

,

)and(

,

,

) in the middle of), and the coordinates of the radio position PVM are (

,

,

).

It should be noted that, according to different design requirements, the virtual receiver can still be defined at any position between the positions of the two receivers 120 and 125 .

，以此類推其他軸 y、 z及揚聲器115，以得出揚聲器110在 y軸上與收音位置PVM的相對距離為

、揚聲器110在 z軸上與收音位置PVM的相對距離為

、揚聲器115在 x軸上與收音位置PVM的相對距離為

、揚聲器115在 y軸上與收音位置PVM的相對距離為

及揚聲器115在 z軸上與收音位置PVM的相對距離為

。接著，空間延遲估測模組131將兩揚聲器110,115在三軸 x、 y、 z上與收音位置PVM的相對距離的差異加總，並據以決定雙聲道揚聲器110,115所處位置的位置偏移

，其數學式表示如下：

…(1) The spatial delay estimation module 131 can determine the position offset according to the relative distances between the two speakers 110 and 115 and the virtual receiver, respectively. Specifically, this positional offset is relative to one of the two speakers 110, 115 being closer to the virtual receiver. The spatial delay estimation module 131 can respectively determine the relative distances between the speakers 110 and 115 on the three axes x , y and z of the coordinate system corresponding to the space and the sound collection position PVM of the virtual microphone, and according to the distance between the two speakers 110 and 115 on the three axes x The position offset is determined by the sum of the distance differences between the relative distances on , y and z to the sound-collecting position PVM. Taking the x -axis as an example, the relative distance between the speaker 110 and the sound collection position PVM is

, and so on for other axes y , z and the speaker 115, so that the relative distance between the speaker 110 and the sound collection position PVM on the y axis is

, the relative distance between the speaker 110 on the z -axis and the sound collection position PVM is

, the relative distance between the speaker 115 and the sound collection position PVM on the x -axis is

, the relative distance between the speaker 115 on the y -axis and the sound collection position PVM is

And the relative distance between the speaker 115 on the z -axis and the sound collection position PVM is

. Next, the spatial delay estimation module 131 sums up the differences in the relative distances between the two speakers 110, 115 on the three axes x , y , and z and the sound-receiving position PVM, and determines the position offset of the positions of the two-channel speakers 110, 115 accordingly.

, and its mathematical expression is as follows:

…(1)

決定時間取樣點的偏移，即空間時間延遲，且其數學式表示如下：

…(2) ，其中

為空間時間延遲(即，揚聲器110,115在空間中的所處位置所造成的時間延遲)(單位為取樣點數)，

為取樣頻率，且

為聲音速度。若空間時間延遲的數值為-X(即，負值)，則代表揚聲器110延遲X個取樣點；若空間時間延遲的數值為+X(即，正值)，則代表揚聲器115延遲X個取樣點。 The spatial delay estimation module 131 can be based on the position offset

Determine the offset of the time sampling point, that is, the space time delay, and its mathematical formula is as follows:

…(2) , where

is the spatial time delay (ie, the time delay caused by the position of the speakers 110, 115 in space) (unit is the number of sampling points),

is the sampling frequency, and

is the speed of sound. If the value of the space time delay is -X (ie, a negative value), it means that the speaker 110 delays X samples; if the value of the space time delay is +X (ie, a positive value), it means that the speaker 115 delays X samples point.

Referring to FIG. 2 , the representative frequency determination module 133 may determine the representative frequency according to human hearing characteristics (step S230 ). Specifically, this human hearing characteristic is related to the sensitivity of human hearing to different frequencies. For example, human hearing is highly sensitive to 20 kilohertz (Hz) to 40 kilohertz, and the sensitivity of the remaining frequencies is attenuated in different proportions. The representative frequency determination module 133 can determine a single frequency according to the hearing sensitivity, and use it as the representative frequency in all frequency bands.

較高(m為序號並為整數，f是頻率，序號越高頻率越高，序號越低頻率越低)。反之，若人類聽覺對某一頻帶的敏感度較低，則此頻帶的權重

較低。例如，頻帶B ₀的權重最高，頻帶B _-2的權重最低。須說明的是，頻帶的劃分不限於倍頻帶(octave band)，且權重的數值可依據實際需求而變更。 In one embodiment, the representative frequency determination module 133 may assign corresponding weights to a plurality of frequency bands according to human hearing characteristics, and each weight is related to the sensitivity of human hearing. FIG. 4 illustrates frequency bands and corresponding weights according to an embodiment of the present invention. Referring to FIG. 4 , it is assumed that the frequency spectrum is divided into these frequency bands B ₋₂ , B ₋₁ , B ₀ , B ₁ , B ₂ based on octave bands. It is worth noting that if human hearing is more sensitive to a certain frequency band, the weight of this frequency band will be

Higher (m is the serial number and is an integer, f is the frequency, the higher the serial number, the higher the frequency, the lower the serial number, the lower the frequency). Conversely, if human hearing is less sensitive to a certain frequency band, the weight of this frequency band will be

lower. For example, band B ₀ has the highest weight and band B _-2 has the lowest weight. It should be noted that the division of frequency bands is not limited to octave bands, and the value of the weight can be changed according to actual needs.

…(3) 而代表頻率

的數學式表示如下：

…(4) 其中

為第 m頻帶的中心頻率在經快速傅立葉變換(Fast Fourier Transform，FFT)或其他頻域至時域轉換後所對應的取樣點位置，

為FFT的長度，

為取樣頻率。 The representative frequency determination module 133 can determine the representative frequency according to the result of the weight calculation of those frequency bands and their weights. The mathematical expression of the weight operation result is as follows:

…(3) for frequency

The mathematical expression is as follows:

…(4) of which

is the sampling point position corresponding to the center frequency of the mth frequency band after Fast Fourier Transform (FFT) or other frequency domain to time domain conversion,

is the length of the FFT,

is the sampling frequency.

It should be noted that, in other embodiments, the representative frequency determination module 133 may directly select the center frequency of the frequency band with higher or highest sensitivity as the representative frequency.

Referring to FIG. 2 , the internal delay estimation module 135 determines the internal delay time difference between the two speakers 110 , 115 within the electronic device 110 according to the representative frequency (step S250 ). Specifically, before the sound signal is played by the speakers 110 and 115, it may be transmitted through one or more circuits (eg, DSP, or codec, etc.) or be affected by the mechanical design of the electronic device 100 (collectively referred to as the non-spatial appearance factor), and further A delay is formed between the signals played by the two speakers 110 and 115 . In the embodiment of the present invention, the internal delay time is related to the phase shift at the representative frequency obtained by the two microphones 120 and 125 to the two speakers 110 and 115 .

In one embodiment, the internal delay estimation module 135 plays one or more test signals through the two speakers 110 , 115 . For example, the test signal includes surround sound. The test signal adopts the pink noise of the general measurement sound field (but it may also be white noise or other sound signals).

的振幅相同(即，

)，而雙聲道訊號

經過EQ增益修正後，左、右聲道的測試訊號變為

和

。內部延遲估測模組135可依據空間延遲訊號來修正測試訊號。假設空間延遲時間(對應到時間偏移

)為負值，則環繞音效的測試訊號

(對應到左聲道),

(對應到右聲道)經修正成為

及

。假設空間延遲時間為正值，則環繞音效的測試訊號

經修正成為

及

。 The original two-channel signal played through speakers 110 and 115 respectively

the same amplitude (i.e.,

), while the two-channel signal

After EQ gain correction, the left and right channel test signals become

and

. The internal delay estimation module 135 can modify the test signal according to the spatial delay signal. Assume space delay time (corresponding to time offset

) is a negative value, the test signal of surround sound

(corresponding to the left channel),

(corresponding to the right channel) is corrected to become

and

. Assuming a positive spatial delay time, the test signal for surround sound

amended to become

and

.

，且收音器125所接收到經A-weighting的接收功率為

。 The internal delay estimation module 135 can respectively pick up the test signal through the two radios 120 and 125 , and obtain the received power corresponding to the two radios 120 and 125 respectively. In some embodiments, these received powers may be adjusted to each other by functions such as A-weighting, Perceived Noise Level, or Weighted Equivalent continuous Perceived Noise Level. The frequencies are given corresponding weights. For example, if the internal delay estimation module 135 plays the test signal of surround sound, the received power of the receiver 120 after A-weighting is:

, and the A-weighted received power received by the radio 125 is

.

的數學表示式為：

…(5) 其中，當

時，雙聲道場型在虛擬收音器位置並達到平衡狀態，且內部延遲時間

為零(即，無須修正延遲)；當

時，雙聲道場型較靠近收音器125，且內部延遲時間

小於零(即，須修正延遲)；當

時，雙聲道場型較靠近收音器120，且內部延遲時間

大於零(即，須修正延遲)。 The internal delay estimation module 135 can determine the internal delay time according to the ratio of the received power corresponding to the two radios 120 and 125 . Specifically, assuming that there is no phase shift, when playing the test signal of surround sound, theoretically, the two-channel signals will cancel each other at the center point, and the sound pressure amplitude will become zero. Internal delay time

The mathematical expression for is:

…(5) where, when

, the binaural pattern is at the virtual receiver position and balanced, and the internal delay time

zero (i.e., no delay correction is required); when

, the two-channel field pattern is closer to the receiver 125, and the internal delay time

less than zero (i.e., the delay must be corrected); when

, the two-channel field pattern is closer to the radio 120, and the internal delay time

Greater than zero (ie, the delay must be corrected).

決定相位偏移，而不用計算所有頻帶的相位偏移，從而減低運算複雜度。 It is also worth noting that in the embodiment of the present invention, the representative frequency is directly used

The phase offset is determined without calculating the phase offset for all frequency bands, thereby reducing the computational complexity.

(對應到左聲道),

(對應到右聲道)經修正成為

及

。若空間延遲時間為正值，則正向方向的測試訊號

經修正成為

及

。另一方面，環繞音效的測試訊號

為

及

。 In another embodiment, the test signal further includes a forward sound effect. Similarly, the internal delay estimation module 135 can modify the test signal according to the spatial delay signal. Assuming that the space delay time is negative, the test signal in the positive direction

(corresponding to the left channel),

(corresponding to the right channel) is corrected to become

and

. If the space delay time is positive, the test signal in the forward direction

amended to become

and

. On the other hand, the test signal for surround sound

for

and

.

，且收音器125所接收到經A-weighting的接收功率為

。 The internal delay estimation module 135 can respectively pick up the test signals of the surround sound effect and the forward direction sound effect (the two test signals are played once) through the two receivers 120 and 125 respectively, and obtain the corresponding received power of the two receivers 120 and 125 respectively. For example, if the internal delay estimation module 135 plays the test signal of the sound effect in the forward direction, the A-weighted received power received by the radio 120 is:

, and the A-weighted received power received by the radio 125 is

.

的數學表示式為：

…(6) 其中，當

時，雙聲道場型在虛擬收音器位置並達到平衡狀態，且內部延遲時間

為零(即，無須修正延遲)；當

時，雙聲道場型較靠近收音器125，且內部延遲時間

小於零(即，須修正延遲)；當

時，雙聲道場型較靠近收音器120，且內部延遲時間

大於零(即，須修正延遲)。 The internal delay estimation module 135 can determine the internal delay time according to the ratio of the received power corresponding to the surround sound effect of the two microphones 120 and 125 and the ratio of the received power corresponding to the forward direction sound effect of the two radios 120 and 125 . Specifically, assuming that there is no phase shift, when the test signal of the sound effect in the forward direction is played, the two-channel signal will theoretically be superimposed at the position of the virtual receiver (assuming the center point between the two receivers 120, 125). , as the sound pressure amplitudes of the two channels are added together. If both surround sound and forward sound are used, the internal delay time

The mathematical expression for is:

…(6) where, when

, the binaural pattern is at the virtual receiver position and balanced, and the internal delay time

zero (i.e., no delay correction is required); when

, the two-channel field pattern is closer to the receiver 125, and the internal delay time

less than zero (i.e., the delay must be corrected); when

, the two-channel field pattern is closer to the radio 120, and the internal delay time

Greater than zero (ie, the delay must be corrected).

…(7) 。而此整體延遲時間用於修正兩揚聲器110,115播放聲音所相差的延遲時間。例如，若整體延遲時間

為正值，則對應於揚聲器115的右聲道訊號將需要延遲

。反之(即，負值)，則為對應於揚聲器110的左聲道訊號需要延遲

。藉此，可提供適當的延遲時間來達成音場平衡。 Referring to FIG. 2 , the overall delay estimation module 137 determines the overall delay time according to the spatial delay time and the internal delay time (step S270 ). Specifically, the embodiment of the present invention comprehensively considers the delay time caused by space and non-space, and the overall delay time of the audio signal output by the integrated electronic device 100 is the sum of the two delay times:

…(7). The overall delay time is used to correct the delay time difference between the two speakers 110 and 115 playing the sound. For example, if the overall delay time

is a positive value, the right channel signal corresponding to speaker 115 will need to be delayed

. On the contrary (ie, a negative value), the left channel signal corresponding to the speaker 110 needs to be delayed

. In this way, an appropriate delay time can be provided to achieve sound field balance.

It is worth noting that, compared with the number of times (may be more than 8 or 10 times) of playing the test signal required to estimate the phase offset for all frequency bands, the embodiment of the present invention only needs to play a specific test signal once. In addition, the embodiment of the present invention has been tested, and it can be found that the difference in sound pressure felt by the human ear when listening within a specific range is reduced to 0.2 dB (decibel) or even lower.

To sum up, in the electronic device and the method for balancing the two-channel sound field in the embodiment of the present invention, in order to obtain a suitable delay time for the whole system and achieve a relatively balanced state of the sound pressure of the two-channel signal, the present invention Embodiments consider two delay times. One is the delay time caused by the position of the binaural speakers, and the other is the time delay caused by the internal system of the electronic device. After the two are integrated, they can be used as the overall delay time, and the sound pressure gap can be effectively reduced after the signal is delayed by correction. In addition, the embodiment of the present invention adopts a single representative frequency, which can not only reduce the amount of calculation, but also reduce the number of times of playing the test signal in the factory testing stage.

Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

,

,

)、(

,

,

)、(

,

,

) 、(

,

,

)、(

,

,

) :座標 PVM:收音位置 PSR、PSL、PM1、PM2:位置 B _-2、B _-1、B ₀、B ₁、B ₂:頻帶 w(m):權重 m:序號 f:頻率100: electronic device 110, 115: speaker 120, 125: radio 130: storage 131: spatial delay estimation module 133: representative frequency determination module 135: internal delay estimation module 137: overall delay estimation module 150: Processors S210~S270: Steps x , y , z : axis (

,

,

), (

,

,

), (

,

,

) , (

,

,

), (

,

,

) : coordinate PVM: radio position PSR, PSL, PM1, PM2: position B _-2 , B _-1 , B ₀ , B ₁ , B ₂ : frequency band w(m): weight m: serial number f: frequency

FIG. 1 is a block diagram of an electronic device according to an embodiment of the present invention. FIG. 2 is a flowchart of a method for balancing a two-channel sound field according to an embodiment of the present invention. FIG. 3 is an example illustrating the positional relationship. FIG. 4 illustrates frequency bands and corresponding weights according to an embodiment of the present invention.

S210~S270: Steps

Claims (10)

A two-channel sound field balancing method, suitable for an electronic device including two speakers and two radios, the two-channel sound field balancing method comprising: determining a spatial delay time difference between the two speakers relative to the two receivers in a space, wherein the spatial delay time is related to the positions of the two speakers respectively in the electronic device; determining a representative frequency according to a human hearing characteristic, wherein the human hearing characteristic is related to the sensitivity to different frequencies; determining an internal delay time of the difference between the two speakers within the electronic device according to the representative frequency, wherein the internal delay time is related to the phase shift at the representative frequency obtained by collecting the two speakers through the two microphones; and An overall delay time is determined according to the spatial delay time and the internal delay time, wherein the overall delay time is used to correct the delay time difference between the sound played by the two speakers. The two-channel sound field balance method according to claim 1, wherein the step of determining the spatial delay time of the two speakers relative to the two radios in the space includes: A virtual receiver is formed between the positions of the two receivers; determining a position offset according to the relative distances between the two speakers and the virtual receiver, wherein the position offset is relative to one of the two speakers being closer to the virtual receiver; and The spatial delay time is determined according to the position offset. The two-channel sound field balance method as claimed in claim 1, wherein the step of determining the representative frequency according to the human hearing characteristic includes: assigning corresponding weights to a plurality of frequency bands respectively according to the human hearing characteristic, wherein each of the weights is related to the sensitivity of human hearing; The representative frequency is determined according to a weight calculation result of the frequency bands and their weights. The two-channel sound field balancing method according to claim 1, wherein the step of determining the internal delay time of the difference between the two speakers in the electronic device according to the representative frequency comprises: Play at least one test signal through the two speakers, wherein the at least one test signal includes a surround sound; respectively collecting the at least one test signal through the two radios, and obtaining the corresponding received power of the two radios; and The internal delay time is determined according to the ratio of the received powers corresponding to the two radios. The two-channel sound field balancing method according to claim 4, wherein the at least one test signal further includes a forward sound effect, wherein the step of determining the internal delay time according to the ratio of the received powers corresponding to the two radios includes: The internal delay time is determined according to the ratio of the received powers corresponding to the surround sound effects of the two radios and the ratio of the received powers of the two radios to the forward sound effects. An electronic device, comprising: two radios; two speakers; and A processor, coupled to the two radios and the two speakers, loads and executes a plurality of modules, and the modules include: a spatial delay estimation module for determining a spatial delay time difference between the two speakers relative to the two receivers in a space, wherein the spatial delay time is related to the positions of the two speakers respectively in the electronic device; a representative frequency determination module for determining a representative frequency according to a human hearing characteristic, wherein the human hearing characteristic is related to the sensitivity to different frequencies; An internal delay estimation module determines an internal delay time difference between the two speakers in the electronic device according to the representative frequency, wherein the internal delay time is related to the representative frequency obtained by collecting the two speakers through the two receivers phase offset under ; and An overall delay estimation module determines an overall delay time according to the spatial delay time and the internal delay time, wherein the overall delay time is used to correct the delay time difference between the sound played by the two speakers. The electronic device of claim 6, wherein the spatial delay estimation module forms a virtual receiver between the positions of the two receivers, and determines a position according to the relative distances between the two speakers and the virtual receiver. offset, and the spatial delay time is determined according to the position offset, wherein the position offset is relative to one of the two speakers which is closer to the virtual receiver. The electronic device as claimed in claim 6, wherein the representative frequency determination module assigns corresponding weights to a plurality of frequency bands respectively according to the human auditory characteristic, and determines the representative frequency according to the weight calculation result of the frequency bands and their weights, wherein each frequency band - The weight is related to the sensitivity of human hearing. The electronic device as claimed in claim 6, wherein the internal delay estimation module plays at least one test signal through the two speakers, respectively picks up the at least one test signal through the two radios, and obtains the corresponding signals of the two radios respectively. receiving power, and determining the internal delay time according to the ratio of the corresponding receiving powers of the two radios, wherein the at least one test signal includes a surround sound effect. The electronic device of claim 9, wherein the at least one test signal further includes a forward direction sound effect, and the internal delay estimation module is based on the ratio of the received powers of the two radios corresponding to the surround sound effect, and the The internal delay time is determined by the ratio of the received power corresponding to the sound effect of the two radios in the forward direction.

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