CN110677771A - Wireless multi-channel sound system and automatic sound channel calibration method thereof - Google Patents
Wireless multi-channel sound system and automatic sound channel calibration method thereof Download PDFInfo
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Abstract
The invention discloses a wireless multi-channel sound system and a sound channel automatic calibration method thereof, wherein the system comprises 1 middle sound box and a plurality of wireless ultrasonic sound boxes with electric pan-tilt bases; a DSP control chip and a microphone array are arranged in the middle-placed sound box; when the sound channels are automatically calibrated, distance measuring commands are sequentially sent to each wireless sound box through the DSP control chip, the microphone array feeds the collected distance measuring commands back to the DSP control chip to be processed, the direction from which sound is sent is sequentially calculated, the DSP control chip matches the sound channels for the wireless ultrasonic sound boxes according to the data in each direction, and finally the DSP control chip controls the wireless ultrasonic sound boxes to adjust the deflection angles of the wireless ultrasonic sound boxes. By adopting the scheme, the user does not need to distinguish the sound channel originally defined by each wireless sound box for placing, and after the sound system is started, the sound system can automatically identify the position of each wireless sound box and match the corresponding sound channel for the wireless sound box, so that the user can obtain correct surround sound information.
Description
Technical Field
The invention relates to the technical field of sound systems, in particular to a wireless multi-channel sound system and an automatic sound channel calibration method thereof.
Background
The 5.1 sound channel surround stereo sound effect is a perfect sound solution at present, and can meet super requirements of computer games and family videos. The 5.1 channel audio device should include: the left front sound box, the right front sound box, the left rear sound box, the right rear sound box, the middle sound box and 1 subwoofer sound box are independent from each other, wherein the '1' sound channel is a specially designed subwoofer sound channel.
At present, in a conventional 5.1 sound channel sound system, a left front sound box, a right front sound box, a left rear sound box and a right rear sound box are defined and matched with a fixed sound channel when leaving a factory, so that when the system is installed, the corresponding sound boxes are required to be placed at preset positions and adjusted to a proper angle to show the best surround stereo effect.
However, for ordinary home users, due to the difference in the layout of the home environment and the lack of sound debugging capability, few users can really debug such a 5.1 channel sound system to its optimal sound effect. Even then, a placement error sometimes occurs. This seriously affects the experience of the user, and the sound system with excellent performance cannot be made to have the public praise and evaluation.
In addition, because the audio amplifier diverse of 4 sound channels, the producer then needs to carry out certain deposit to the audio amplifier of every sound channel to satisfy user's maintenance replacement demand. This greatly increases the cost of manufacture by the manufacturer.
Disclosure of Invention
The purpose of the invention is: a wireless multi-channel sound system and a sound channel automatic calibration method thereof are provided, the sound system can automatically match the sound channel adapted to the sound box according to the placement position of the sound box, and automatically adjust the alignment angle of the loudspeaker, thereby obtaining the best listening sound effect at the user experience position.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a wireless multi-channel sound system comprises a middle sound box and a plurality of wireless sound boxes; a DSP control chip and a microphone array are arranged in the middle-mounted sound box; the microphone array collects audio signals sent by the wireless sound box and feeds the audio signals back to the DSP control chip for processing; the DSP control chip is connected with the wireless sound box in a matching mode through a wireless network, an electric holder base is installed at the bottom of the wireless sound box, and the electric holder base rotates according to a deflection instruction sent by the DSP control chip.
As a preferred technical solution, the microphone array includes two microphones, and the two microphones are arranged at two ends of the center speaker in a straight line.
As the preferred technical scheme, the wireless sound boxes comprise 4 wireless ultrasonic sound boxes.
As a preferred technical scheme, a unique machine identification code is preset in each wireless sound box.
As a preferred technical scheme, the DSP control chip is also connected with a wireless subwoofer sound box in a matching way through a wireless network.
As a preferred technical scheme, the middle speaker is placed right in front of the user experience position, and the four wireless ultrasonic speakers are respectively placed in front of the left, front of the right, rear of the left, and rear of the user experience position in a pairwise symmetric manner.
A sound channel automatic calibration method of a wireless multi-channel sound system comprises 1 middle sound box and 4 wireless ultrasonic sound boxes with electric pan-tilt bases, wherein a linear microphone array and a DSP control chip are arranged in the middle sound box, and the linear microphone array is composed of two microphones; the sound channel automatic calibration method comprises the following steps:
1) placing the middle sound box right in front of a user experience position, placing 4 wireless ultrasonic sound boxes in the left front, the right front, the left rear and the right rear of the user experience position respectively without difference, then starting the middle sound box and the four wireless ultrasonic sound boxes respectively, and connecting the middle sound box and the 4 wireless ultrasonic sound boxes in a one-to-one pairing manner;
2) the DSP control chip broadcasts a distance measuring command to the 4 wireless ultrasonic sound boxes through the middle sound box; the distance measurement command requires the wireless ultrasonic sound box to feed back a distance measurement pulse signal at a certain initial moment; the two microphones of the microphone array respectively receive the ranging pulse signals, and the DSP control chip respectively records respective receiving moments;
3) the DSP control chip calculates the service time of the ranging pulse signal reaching the microphones on the left and right sides according to the initial sending time of the ranging pulse signal and the receiving time of the ranging pulse signal reaching the microphones on the left and right sides;
4) calculating and comparing the service time of the distance measuring pulse signals respectively reaching the left microphone and the right microphone;
if the using time of the ranging pulse signal reaching the left microphone is longer than the using time of the ranging pulse signal reaching the right microphone, the wireless ultrasonic sound box for sending the ranging pulse signal is judged to be positioned on the right side of the user experience position; otherwise, judging that the left side is located;
5) dividing the 4 wireless ultrasonic sound boxes into a left group and a right group according to the judgment result; comparing the service durations of the ranging pulse signals sent by the two wireless ultrasonic sound boxes in the same group when the ranging pulse signals respectively reach the same microphone; the user experience position is located behind the user experience position with longer use time, and the user experience position is located in front of the user experience position with shorter use time;
6) according to the determined azimuth information of the 4 wireless ultrasonic sound boxes, the DSP control chip respectively matches the corresponding sound channels for the 4 wireless ultrasonic sound boxes;
7) the DSP control chip sequentially sends a plurality of groups of deflection commands to each wireless ultrasonic sound box through the middle sound box, and the wireless ultrasonic sound box sends a feedback pulse signal after each deflection is in place; the deflection command comprises deflection angle information of the wireless ultrasonic sound box and initial time of sending a feedback pulse signal;
microphones on the left side and the right side of the middle sound box receive a plurality of groups of feedback pulse signals from each wireless ultrasonic sound box and respectively record the receiving time;
8) the DSP control chip calculates and counts the propagation service time of a plurality of groups of feedback pulse signals, and selects the feedback pulse signals corresponding to the wireless ultrasonic sound boxes meeting the following requirements respectively:
the service time of the feedback pulse signal from the left front wireless ultrasonic sound box to the left end microphone is equal to the service time of the feedback pulse signal from the right front wireless ultrasonic sound box to the right end microphone;
the service time of the feedback pulse signal from the left front wireless ultrasonic sound box to the right end microphone is equal to the service time of the feedback pulse signal from the right front wireless ultrasonic sound box to the left end microphone;
the service time of the feedback pulse signal from the left rear wireless ultrasonic sound box to the left end microphone is equal to the service time of the feedback pulse signal from the right rear wireless ultrasonic sound box to the right end microphone;
the service time of the feedback pulse signal from the left rear wireless ultrasonic sound box to the right end microphone is equal to the service time of the feedback pulse signal from the right rear wireless ultrasonic sound box to the left end microphone;
9) the DSP control chip finds out deflection angle information corresponding to each selected feedback pulse signal according to the feedback pulse signals, namely, the optimal deflection angle information of the wireless ultrasonic sound box is obtained; the middle sound box controls the corresponding wireless ultrasonic sound box to deflect to an optimal angle according to the optimal deflection angle information, and when the optimal angle is reached, the wireless ultrasonic sound box feeds back in-place pulse information to the DSP control chip;
10) and when the DSP control chip receives the in-place pulse information of each wireless ultrasonic sound box, sending out a calibration completion prompt tone, and terminating the calibration step.
As a further preferable technical scheme, a unique machine identification code is preset in the wireless ultrasonic sound box, and the center sound box is respectively connected with the four wireless ultrasonic sound boxes in a one-to-one pairing manner through the machine identification code.
As a further preferred technical solution, the ranging command includes 4 initial times corresponding to the machine identification codes one by one, and the wireless ultrasonic sound box obtains the initial time corresponding to the machine identification code according to the machine identification code.
As a further preferable technical solution, the ranging pulse signal and the feedback pulse signal are both pulse signals with a frequency of 15K.
As a further preferable technical solution, the DSP control chip sends 64 sets of deflection instructions to each wireless ultrasonic sound box through the center sound box.
As a further preferable technical solution, the wireless ultrasonic sound box can deflect only in the horizontal direction, and the maximum deflection included angle is set to 90 °.
The invention has the beneficial effects that: by adopting the scheme, the user does not need to distinguish the sound channel originally defined by each wireless sound box for placing, and after the sound system is started, the sound system can automatically identify the position of each wireless sound box and match the corresponding sound channel for the wireless sound box, so that the user can obtain correct surround sound information. In addition, the DSP control chip enables a user to experience the position to obtain the best sound effect experience by adjusting the deflection angle of the deflection angle wireless sound box.
Drawings
Fig. 1 is a schematic diagram of the placement of the speakers of the sound system of the present invention.
In the figure: 1-middle sound box, 2-wireless ultrasonic sound box, 3-user experience position, 11-left microphone and 12-right microphone.
Detailed Description
The following is combined with the attached drawings. The present invention is further explained.
As shown in fig. 1, the wireless multi-channel sound system of the present invention includes a center speaker 1 and four wireless ultrasonic speakers 2. Wherein, the box of in putting audio amplifier 1 is the strip, and puts in the dead ahead of user experience position 3, and four wireless ultrasonic sound boxes 2 are put respectively in the left place ahead, right front, left rear and the right back of user experience position 3. The bottom of the wireless ultrasonic sound box 2 is provided with an electric holder base.
Wherein, a DSP control chip is arranged in the middle speaker 1, and a left microphone 11 and a right microphone 12 are symmetrically arranged on two sides of a strip-shaped box body of the middle speaker. The two microphones simultaneously collect audio signals sent by the wireless ultrasonic sound box 2 and feed the collected audio signals back to the DSP control chip for processing; the DSP control chip is connected with the wireless ultrasonic sound box in a matching mode through a wireless network and controls the electric holder base to rotate.
In addition, each wireless ultrasonic sound box 2 is preset with a unique machine identification code.
In order to realize the stereo surround effect of the 5.1 sound channel, the sound system is also provided with a wireless subwoofer sound box, and the subwoofer sound box is connected with the DSP control chip through a wireless network. Since the human ear cannot distinguish the direction of the subwoofer, the subwoofer can be placed at any position.
A method for automatically calibrating the sound channels of a wireless multi-channel sound system comprises the following steps:
1) the method comprises the following steps that a middle sound box is placed right in front of a user experience position, four wireless ultrasonic sound boxes are placed to the left front, the right front, the left rear and the right rear of the user experience position respectively without difference, and the positions of the four wireless ultrasonic sound boxes are symmetric to each other in a left-right mode relative to the middle sound box; presetting a unique machine code in each wireless ultrasonic sound box, starting a middle sound box and four wireless ultrasonic sound boxes, wherein the middle sound box is respectively connected with the four wireless ultrasonic sound boxes in a one-to-one matching way through the unique machine code;
2) broadcasting a distance measuring command to the four wireless ultrasonic sound boxes by the middle sound box; the distance measurement command requires the wireless ultrasonic sound box to feed back a distance measurement pulse signal at a certain initial moment; the microphones on the left and right sides of the middle speaker receive the ranging pulse signals and respectively record the receiving time;
the comparison table of the initial time of the four wireless ultrasonic sound boxes and the receiving time of the left microphone and the right microphone is as follows:
3) the DSP control chip calculates the service time of the ranging pulse signal reaching the left and right microphones according to the initial sending time of the ranging pulse signal and the receiving time of the ranging pulse signal reaching the left and right microphones;
namely: according to the formula: t isLength of use=TReceiving-TInitialRespectively calculating the wireless ultrasonic sound boxes which send the ranging pulse signals toThe use duration of the microphones on the left side and the right side;
4) calculating and comparing the service time of the distance measuring pulse signals respectively reaching the left microphone and the right microphone; if the service time of the distance measuring pulse signal reaching the left microphone is longer than that of the distance measuring pulse signal reaching the right microphone, namely TnL>TnRIf the wireless ultrasonic sound box sending the ranging pulse signal is located on the right side of the user experience position, judging that the wireless ultrasonic sound box sending the ranging pulse signal is located on the right side of the user experience position; otherwise, TnL<TnRIf yes, judging that the left side is located;
5) dividing the 4 wireless ultrasonic sound boxes into a left group and a right group according to the judgment result; comparing the service durations of the ranging pulse signals sent by the two wireless ultrasonic sound boxes in the same group when the ranging pulse signals respectively reach the same microphone; the user experience position is located behind the user experience position with longer use time, and the user experience position is located in front of the user experience position with shorter use time;
6) according to the determined azimuth information of the 4 wireless ultrasonic sound boxes, the DSP control chip respectively matches the corresponding sound channels for the 4 wireless ultrasonic sound boxes; the wireless ultrasonic sound box at the front left side is matched with the front left sound channel, the wireless ultrasonic sound box at the front right side is matched with the front right sound channel, the wireless ultrasonic sound box at the rear left side is matched with the rear left sound channel, and the wireless ultrasonic sound box at the rear right side is matched with the rear right sound channel;
7) the middle sound box sequentially sends a plurality of groups of deflection commands to each wireless ultrasonic sound box, and the wireless ultrasonic sound box sends a feedback pulse signal after each deflection in place; the deflection command comprises deflection angle information of the wireless ultrasonic sound box and initial time of sending a feedback pulse signal;
the microphones on the left and right sides of the middle sound box receive a plurality of groups of feedback pulse signals from each wireless ultrasonic sound box and respectively record the receiving time;
8) the center sound box calculates and counts the propagation service time of a plurality of groups of feedback pulse signals, and selects the feedback pulse signals corresponding to the wireless ultrasonic sound boxes which meet the following requirements respectively:
the service time of the feedback pulse signal from the left front wireless ultrasonic sound box to the left end microphone is equal to the service time of the feedback pulse signal from the right front wireless ultrasonic sound box to the right end microphone;
the service time of the feedback pulse signal from the left front wireless ultrasonic sound box to the right end microphone is equal to the service time of the feedback pulse signal from the right front wireless ultrasonic sound box to the left end microphone;
the service time of the feedback pulse signal from the left rear wireless ultrasonic sound box to the left end microphone is equal to the service time of the feedback pulse signal from the right rear wireless ultrasonic sound box to the right end microphone;
the service time of the feedback pulse signal from the left rear wireless ultrasonic sound box to the right end microphone is equal to the service time of the feedback pulse signal from the right rear wireless ultrasonic sound box to the left end microphone;
one specific calculation method is listed below:
assuming that a left rear wireless ultrasonic sound box and a right rear wireless ultrasonic sound box have been determined;
two values of the feedback pulse signal from the left rear ultrasonic sound box to the left end microphone and the right end microphone respectively are TLn1And TLn2N is several groups of 1 ~ n.
Two values of the feedback pulse signal from the right rear ultrasonic sound box to the left end microphone and the right end microphone respectively are TRn1And TRn2N is several groups of 1 ~ n.
Calculating to obtain data by using the following formula;
（TLn1- TRn2）2+ （TLn2- TRn1）2
therefore, n × n data can be acquired, and the deflection angle information corresponding to the feedback pulse signal corresponding to the minimum value is taken, namely the optimal deflection angle.
The maximum deflection angles of the left front ultrasonic sound box and the right front ultrasonic sound box are obtained by the same method.
9) The middle sound box finds out deflection angle information corresponding to the selected feedback pulse signals according to the selected feedback pulse signals, namely, the optimal deflection angle information of the wireless ultrasonic sound box is obtained; the middle sound box controls the corresponding wireless ultrasonic sound box to deflect to the optimal angle according to the optimal deflection angle information, and when the optimal angle is reached, the wireless ultrasonic sound box feeds back in-place pulse information to the middle sound box;
10) and when the middle sound box receives the in-place pulse information of each wireless ultrasonic sound box, sending out a calibration completion prompt tone, and terminating the calibration step.
In the above step, the ranging pulse signal and the feedback pulse signal are both pulse signals with a frequency of 15K.
In addition, a high-performance DSP chip is adopted in the scheme, so that the microphone can acquire and recognize pulse signals more accurately.
In order to reduce the calculated amount, the center sound box sends 64 groups of deflection instructions to each wireless ultrasonic sound box, each wireless ultrasonic sound box can deflect only in the horizontal direction, and the maximum deflection included angle is set to be 90 degrees, so that the calibration speed of the system can be greatly improved.
The basic principles and the main features of the solution and the advantages of the solution have been shown and described above. It will be understood by those skilled in the art that the present solution is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principles of the solution, but that various changes and modifications may be made to the solution without departing from the spirit and scope of the solution, and these changes and modifications are intended to be within the scope of the claimed solution. The scope of the present solution is defined by the appended claims and equivalents thereof.
Claims (10)
1. A wireless multi-channel sound system is characterized by comprising a middle sound box and a plurality of wireless sound boxes; a DSP control chip and a microphone array are arranged in the middle-mounted sound box; the microphone array collects audio signals sent by the wireless sound box and feeds the audio signals back to the DSP control chip for processing; the DSP control chip is connected with the wireless sound box in a matching mode through a wireless network, an electric holder base is installed at the bottom of the wireless sound box, and the electric holder base rotates according to a deflection instruction sent by the DSP control chip.
2. The wireless multi-channel sound system as claimed in claim 2, wherein the microphone array comprises two microphones arranged in a line at both ends of the center speaker.
3. A wireless multi-channel sound system according to claim 2, wherein the number of the wireless sound boxes is 4, and all of the wireless sound boxes are wireless ultrasonic sound boxes.
4. The wireless multi-channel audio system as claimed in claim 1, wherein the wireless sound box has a unique machine identification code pre-installed therein.
5. The wireless multichannel sound system as claimed in claim 1, wherein said DSP control chip is further coupled to a wireless subwoofer speaker in a paired manner via a wireless network.
6. A sound channel automatic calibration method of a wireless multi-channel sound system is characterized in that the system comprises 1 middle sound box and 4 wireless ultrasonic sound boxes with electric pan-tilt bases, and a linear microphone array and a DSP control chip which are formed by two microphones are arranged in the middle sound box; the sound channel automatic calibration method comprises the following steps:
1) placing the middle sound box right in front of a user experience position, placing 4 wireless ultrasonic sound boxes in the left front, the right front, the left rear and the right rear of the user experience position respectively without difference, then starting the middle sound box and the four wireless ultrasonic sound boxes respectively, and connecting the middle sound box and the 4 wireless ultrasonic sound boxes in a one-to-one pairing manner;
2) the DSP control chip broadcasts a distance measuring command to the 4 wireless ultrasonic sound boxes through the middle sound box; the distance measurement command requires the wireless ultrasonic sound box to feed back a distance measurement pulse signal at a certain initial moment; the two microphones of the microphone array respectively receive the ranging pulse signals, and the DSP control chip respectively records respective receiving moments;
3) the DSP control chip calculates the service time of the ranging pulse signal reaching the microphones on the left and right sides according to the initial sending time of the ranging pulse signal and the receiving time of the ranging pulse signal reaching the microphones on the left and right sides;
4) calculating and comparing the service time of the distance measuring pulse signals respectively reaching the left microphone and the right microphone;
if the using time of the ranging pulse signal reaching the left microphone is longer than the using time of the ranging pulse signal reaching the right microphone, the wireless ultrasonic sound box for sending the ranging pulse signal is judged to be positioned on the right side of the user experience position; otherwise, judging that the left side is located;
5) dividing the 4 wireless ultrasonic sound boxes into a left group and a right group according to the judgment result; comparing the service durations of the ranging pulse signals sent by the two wireless ultrasonic sound boxes in the same group when the ranging pulse signals respectively reach the same microphone; the user experience position is located behind the user experience position with longer use time, and the user experience position is located in front of the user experience position with shorter use time;
6) according to the determined azimuth information of the 4 wireless ultrasonic sound boxes, the DSP control chip respectively matches the corresponding sound channels for the 4 wireless ultrasonic sound boxes;
7) the DSP control chip sequentially sends a plurality of groups of deflection commands to each wireless ultrasonic sound box through the middle sound box, and the wireless ultrasonic sound box sends a feedback pulse signal after each deflection is in place; the deflection command comprises deflection angle information of the wireless ultrasonic sound box and initial time of sending a feedback pulse signal;
microphones on the left side and the right side of the middle sound box receive a plurality of groups of feedback pulse signals from each wireless ultrasonic sound box and respectively record the receiving time;
8) the DSP control chip calculates and counts the propagation service time of a plurality of groups of feedback pulse signals, and selects the feedback pulse signals corresponding to the wireless ultrasonic sound boxes meeting the following requirements respectively:
the service time of the feedback pulse signal from the left front wireless ultrasonic sound box to the left end microphone is equal to the service time of the feedback pulse signal from the right front wireless ultrasonic sound box to the right end microphone;
the service time of the feedback pulse signal from the left front wireless ultrasonic sound box to the right end microphone is equal to the service time of the feedback pulse signal from the right front wireless ultrasonic sound box to the left end microphone;
the service time of the feedback pulse signal from the left rear wireless ultrasonic sound box to the left end microphone is equal to the service time of the feedback pulse signal from the right rear wireless ultrasonic sound box to the right end microphone;
the service time of the feedback pulse signal from the left rear wireless ultrasonic sound box to the right end microphone is equal to the service time of the feedback pulse signal from the right rear wireless ultrasonic sound box to the left end microphone;
9) the DSP control chip finds out deflection angle information corresponding to each selected feedback pulse signal according to the feedback pulse signals, namely, the optimal deflection angle information of the wireless ultrasonic sound box is obtained; the middle sound box controls the corresponding wireless ultrasonic sound box to deflect to an optimal angle according to the optimal deflection angle information, and when the optimal angle is reached, the wireless ultrasonic sound box feeds back in-place pulse information to the DSP control chip;
10) and when the DSP control chip receives the in-place pulse information of each wireless ultrasonic sound box, sending out a calibration completion prompt tone, and terminating the calibration step.
7. The method as claimed in claim 6, wherein a unique machine identification is preset in the wireless ultrasonic speaker, and the center speaker is connected to four wireless ultrasonic speakers in a one-to-one pairing manner through the machine identification.
8. The method of claim 6, wherein the ranging pulse signal and the feedback pulse signal are both pulse signals having a frequency of 15K.
9. The method as claimed in claim 6, wherein the DSP control chip sends 64 sets of deflection commands to each of the wireless ultrasonic speakers through the center speaker.
10. The method of claim 6, wherein the wireless ultrasonic speaker box can be deflected only in a horizontal direction and the maximum deflection angle is set to 90 °.
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