Method and system for automatic tracking shooting of wireless microphone

Abstract

The invention discloses a wireless microphone automatic tracking shooting method and system, and the method comprises the steps: S1, enabling a spokesman to start any wireless microphone for speaking, and transmitting an audio signal to a signal intensity detection and coordinate calculator through receiving antennas 1, 2 and 3; s2, a signal intensity detection and coordinate calculator receives the audio signals transmitted by the receiving antennas 1, 2 and 3, calculates the position coordinates of the wireless microphones, and transmits the audio signal with the maximum signal intensity and the position coordinates to a conference host; s3, the conference host receives the audio signals transmitted by the signal strength detection and coordinate calculator and the position coordinates, controls the camera to automatically track the spokesman according to the position coordinates, and transmits the audio signals to the power amplifier sound box; the system comprises n wireless microphones, receiving antennas 1, 2 and 3, a signal strength detection and coordinate calculator, a conference host, m cameras and a power amplifier sound box, and the effect of automatically tracking and shooting according to the coordinate positions of the wireless microphones is achieved.

Description

Technical Field

[0001] The invention relates to a method and a system for automatic tracking and shooting of a wireless microphone, belonging to the technical field of wireless conference systems. Background Art

[0002] In modern large-scale conferences and public speaking events, high-quality audio-visual experience is essential for participants. In order to ensure that the speaker can be effectively visually recorded and displayed during the speech, a camera system is usually used for tracking shooting. This not only enhances the professional image of the meeting, but also improves the sense of participation of remote participants.

[0003] At present, the camera tracking technology commonly used in the industry relies on the preset method. This method involves that before the meeting starts, the technicians manually set the fixed shooting angles and focal lengths of multiple cameras according to the layout of the venue and the expected positions of the speakers, and bind these positions to specific microphone signals. When the speaker starts speaking and the corresponding microphone is activated, the system will call the camera preset position bound to the microphone to achieve instant tracking and shooting of the speaker.

[0004] Although the preset method meets the basic shooting needs to a certain extent, there are several major problems:

[0005] (1) Setup complexity: The setup process for preset positions is cumbersome and time-consuming, requiring technicians to precisely adjust the camera position corresponding to each microphone. This is particularly evident in large conferences, which may involve dozens or even more microphones and cameras.

[0006] (2) Lack of flexibility: When the conference layout changes, such as adding or moving microphone positions, the previously set preset positions will no longer be applicable and need to be reset, which not only increases the workload but may also cause delays in the conference process.

[0007] (3) Poor adaptability: In some unexpected situations, such as when a speaker temporarily changes position or moves in the venue, the camera with a fixed preset position cannot adjust the shooting angle in time, resulting in missing key images or causing unsatisfactory shooting effects.

[0008] In view of the problems existing in the existing preset positioning method in camera tracking technology, the present invention develops a microphone automatic tracking and shooting system that can automatically adapt to changes in the conference environment, does not require manual preset, and can respond to the movement of the speaker in real time, which will undoubtedly greatly enhance the audio-visual experience and professionalism of the meeting. Summary of the invention

[0009] In view of the above existing technical problems, the present invention provides a method and system for automatic tracking and shooting of a wireless microphone, so as to achieve the technical purpose of automatically adapting to changes in the conference environment without manual preset and responding to the movement of the speaker in real time.

[0010] To achieve the above technical objectives, firstly, the present invention provides a method for automatic tracking shooting of a wireless microphone, comprising the following steps:

[0011] S1. The speaker turns on any wireless microphone to speak, and the audio signal output by the wireless microphone is transmitted to the signal strength detection and coordinate calculator via receiving antennas 1, 2, and 3 respectively;

[0012] S2, signal strength detection and coordinate calculator receives the audio signals transmitted by receiving antennas 1, 2, and 3, calculates the position coordinates of the wireless microphone, and then transmits the audio signal with the largest signal strength and the position coordinates of the wireless microphone to the conference host;

[0013] S3, the conference host receives the audio signal transmitted by the signal strength detection and coordinate calculator, as well as the position coordinates of the wireless microphone, and controls the camera to automatically track the speaker according to the position coordinates of the wireless microphone, and transmits the audio signal of the wireless microphone to the power amplifier speaker for external playback.

[0014] The method of the present invention further comprises the following sub-steps: in S2, calculating the position coordinates of the wireless microphone:

[0015] S2-1, respectively measure the signal power received by receiving antenna 2 when receiving antenna 1 transmits a test signal, the signal power received by receiving antenna 3 when receiving antenna 1 transmits a test signal, and the signal power received by receiving antenna 3 when receiving antenna 2 transmits a test signal;

[0016] S2-2, according to the three measured signal powers, respectively calculate the distances between receiving antennas 1 and 2, receiving antennas 1 and 3, and receiving antennas 2 and 3;

[0017] S2-3, calculating the position coordinates of receiving antennas 1, 2, and 3 respectively according to the calculated distances between receiving antennas 1 and 2, receiving antennas 1 and 3, and receiving antennas 2 and 3;

[0018] S2-4, respectively measure the signal power received by receiving antennas 1, 2, and 3 when the wireless microphone activated by the speaker transmits a test signal to receiving antennas 1, 2, and 3;

[0019] S2-5, calculating the distances between the wireless microphone and the receiving antennas 1, 2, and 3 respectively according to the measured signal powers received by the receiving antennas 1, 2, and 3;

[0020] S2-6. Calculate the position coordinates of the wireless microphone according to the calculated distance between the wireless microphone and the receiving antennas 1, 2, and 3.

[0021] Specifically, the method of the present invention comprises the following sub-steps:

[0022] The test signal is transmitted from receiving antenna 1 to receiving antenna 2, and the transmission signal power is P t1 , and measure the signal power received by receiving antenna 2, denoted as P r12 ;

[0023] The test signal is transmitted from receiving antenna 1 to receiving antenna 3, and the transmission signal power is P t1 , and measure the signal power received by receiving antenna 3, denoted as P r13 ;

[0024] The test signal is transmitted from receiving antenna 2 to receiving antenna 3, and the transmission signal power is P t2 , and measure the signal power received by receiving antenna 3, denoted as P r23 .

[0025] Specifically, the method of the present invention comprises the following sub-steps:

[0026] Assume d 12 is the distance between receiving antenna 1 and receiving antenna 2, d 13 is the distance between receiving antenna 1 and receiving antenna 3, d 23 is the distance between receiving antenna 2 and receiving antenna 3, then the calculation formula is:

[0027]

[0028] Among them, P t1 is the signal power transmitted by receiving antenna 1; P r12 is the signal power received by receiving antenna 2 when receiving antenna 1 transmits a test signal to receiving antenna 2; n 12 is the path loss index when receiving antenna 1 transmits the test signal to receiving antenna 2;

[0029] P r13 is the signal power received by receiving antenna 3 when receiving antenna 1 transmits a test signal to receiving antenna 3; n 13 is the path loss index when receiving antenna 1 transmits the test signal to receiving antenna 3;

[0030] P t2 is the signal power transmitted by receiving antenna 2; P r23 is the signal power received by receiving antenna 3 when receiving antenna 2 transmits a test signal to receiving antenna 3; n 23It is the path loss index when receiving antenna 2 transmits the test signal to receiving antenna 3.

[0031] Specifically, the method of the present invention comprises the following sub-steps:

[0032] Assume that the coordinates of receiving antenna 1 are the origin (0, 0, 0), and the three receiving antennas are on the same horizontal plane. The coordinates of receiving antenna 2 can be set to (x2, y2, 0), and the coordinates of receiving antenna 3 can be set to (x3, y3, 0). The calculation formula is:

[0033]

[0034] Specifically, the method of the present invention comprises the following sub-steps:

[0035] Let the wireless microphone turned on by the speaker be wireless microphone k (1≤k≤n, n≥1);

[0036] The wireless microphone k transmits a test signal to the receiving antenna 1, and the transmitted signal power is P t1 , and measure the signal power received by receiving antenna 1, denoted as P r1k ;

[0037] The wireless microphone k transmits a test signal to the receiving antenna 2, and the transmission signal power is P t2 , and measure the signal power received by receiving antenna 2, denoted as P r2k ;

[0038] The wireless microphone k transmits a test signal to the receiving antenna 3, and the transmission signal power is P t3 , and measure the signal power received by receiving antenna 2, denoted as P r3k .

[0039] Specifically, the method of the present invention comprises the following sub-steps:

[0040] Assume that the distance between the wireless microphone k and the receiving antenna 1 is d k1 , the distance between the wireless microphone k and the receiving antenna 2 is d k2 , the distance between the wireless microphone k and the receiving antenna 2 is d k3 , the calculation formula is:

[0041]

[0042] Among them, P t1 is the signal power transmitted by wireless microphone k to receiving antenna 1; P r1k is the signal power received by receiving antenna 1 when wireless microphone k transmits a test signal to receiving antenna 1; n 1k is the path loss index when wireless microphone k transmits a test signal to receiving antenna 1;

[0043] P t2 is the signal power transmitted by wireless microphone k to receiving antenna 2; P r2k is the signal power received by receiving antenna 2 when wireless microphone k transmits a test signal to receiving antenna 2; n 2k is the path loss index when the wireless microphone k transmits the test signal to the receiving antenna 2;

[0044] P t3 is the signal power transmitted by the wireless microphone k to the receiving antenna 3; P r3k is the signal power received by the receiving antenna 3 when the receiving antenna 3 transmits the test signal to the wireless microphone k; n 3k is the path loss index when the wireless microphone k transmits the test signal to the receiving antenna 3.

[0045] Specifically, the method of the present invention comprises the following sub-steps:

[0046] Assuming the coordinates of the wireless microphone are (x, y, z), the calculation formula is:

[0047]

[0048] Secondly, the present invention also provides a wireless microphone automatic tracking shooting system to implement the wireless microphone automatic tracking shooting method, comprising n wireless microphones, receiving antennas 1, 2, 3 arranged on the same horizontal plane, a signal strength detector and coordinate calculator, a conference host, m cameras, and a power amplifier speaker, wherein n≥1, m≥1;

[0049] The wireless microphone is electrically connected to receiving antennas 1, 2, and 3 respectively through wireless modulation signals; it is used for the speaker to turn on the wireless microphone to speak;

[0050] The receiving antennas 1, 2, and 3 are electrically connected to the signal strength detection and coordinate calculator respectively; and are used to transmit the audio signal output by the wireless microphone to the signal strength detection and coordinate calculator via the receiving antennas 1, 2, and 3;

[0051] The signal strength detection and coordinate calculator is electrically connected to the conference host; it is used to receive the audio signals transmitted by the receiving antennas 1, 2, and 3, and calculate the position coordinates of the wireless microphone, and then transmit the audio signal with the maximum signal strength and the position coordinates of the wireless microphone to the conference host;

[0052] The conference host is electrically connected to m cameras and an amplifier speaker through camera control signals; it is used to receive the audio signal transmitted by the signal strength detection and coordinate calculator, as well as the position coordinates of the wireless microphone, and control the camera to automatically track the speaker according to the position coordinates of the wireless microphone, and at the same time transmit the audio signal of the wireless microphone to the amplifier speaker for external playback.

[0053] The system of the present invention further includes a display screen;

[0054] The display screens are electrically connected to m cameras respectively, and are used to display the speaker's image in real time.

[0055] In summary, the method and system for automatic tracking and shooting of a wireless microphone provided by the present invention obtains the position coordinates of the wireless microphone turned on by the speaker, controls the camera to automatically track the position of the speaker, and achieves the technical effect of amplifying the speaker's voice in the meeting while automatically tracking and shooting to record the speaker's speech process and displaying it in real time on the display screen.

[0056] Compared with the prior art, the present invention has the following technical advantages:

[0057] 1. The present invention can automatically adapt to changes in the conference environment without manual preset, and can respond to the speaker's moving wireless microphone in real time, and automatically track and shoot the speaker's screen.

[0058] 2. The present invention greatly improves the efficiency and quality of meetings, while reducing reliance on manual operations, providing a smoother and more professional experience for meeting organizers and participants. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a principle block diagram of the system of the present invention;

[0060] Figure 2 is a flow chart of the steps of the method of the present invention;

[0061] Figure 3 The figure is a flow chart of the algorithm of signal strength detection and coordinate calculator in the system of the present invention. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0063] In the description of this application, words such as "connection" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] Example 1: Figure 2 As shown, the present invention provides a method for automatic tracking and shooting with a wireless microphone, and a system for automatic tracking and shooting with a wireless microphone. The specific steps are described as follows.

[0065] S1. The speaker turns on any wireless microphone to speak, and the audio signal output by the wireless microphone is transmitted to the signal strength detection and coordinate calculator via receiving antennas 1, 2, and 3 respectively.

[0066] In specific implementation, when the speaker turns on any wireless microphone, the sensor inside the wireless microphone converts the sound signal into an electrical signal, and then converts the electrical signal into a signal form suitable for wireless transmission through modulation technology, and then sends it out through wireless frequency, and then transmits it to the signal strength detection and coordinate calculator through receiving antennas 1, 2, and 3 respectively.

[0067] S2, signal strength detection and coordinate calculator receives the audio signals transmitted by receiving antennas 1, 2, and 3, calculates the position coordinates of the wireless microphone, and then transmits the audio signal with the maximum signal strength and the position coordinates of the wireless microphone to the conference host.

[0068] When implementing it, Figure 1 As shown, receiving antennas 1, 2, and 3 all participate in the transmission of audio signals. After the signal strength detector and coordinate calculator receive three audio signals, it will take the audio signal with the largest signal strength for subsequent transmission.

[0069] It should be noted that if Figure 3 As shown, the signal strength detection and coordinate calculator calculates the position coordinates of the wireless microphone, including the following sub-steps.

[0070] S2-1. According to the existing RSSI technology, each receiving antenna transmits a test signal to other receiving antennas and measures the signal power received by other receiving antennas to obtain the signal power P received by receiving antenna 2 when receiving antenna 1 transmits a test signal to receiving antenna 2. r12 , when receiving antenna 1 transmits a test signal to receiving antenna 3, the signal power P received by receiving antenna 3 r13 , when receiving antenna 2 transmits a test signal to receiving antenna 3, the signal power P received by receiving antenna 3 r23 , details are as follows.

[0071] The test signal is transmitted from receiving antenna 1 to receiving antenna 2, and the transmission signal power is P t1 , and measure the signal power received by receiving antenna 2, denoted as P r12 ;

[0072] The test signal is transmitted from receiving antenna 1 to receiving antenna 3, and the transmission signal power is P t1 , and measure the signal power received by receiving antenna 3, denoted as P r13 ;

[0073] The test signal is transmitted from receiving antenna 2 to receiving antenna 3, and the transmission signal power is P t2 , and measure the signal power received by receiving antenna 3, denoted as P r23 .

[0074] Thus, the signal power P can be measured respectively. r12 , P r13 , P r23 .

[0075] S2-2, according to the three signal powers P r12 , P r13 , P r23 , calculate the distance between each two receiving antennas respectively, as follows.

[0076] Assume d 12 is the distance between receiving antenna 1 and receiving antenna 2, d 13 is the distance between receiving antenna 1 and receiving antenna 3, d 23 is the distance between receiving antenna 2 and receiving antenna 3, then the calculation formula is:

[0077]

[0078] Among them, P t1 is the signal power (dBm) transmitted by receiving antenna 1. The default transmit signal power is fixed; P r12 is the signal power (dBm) received by receiving antenna 2 when receiving antenna 1 transmits a test signal to receiving antenna 2; n 12 It is the path loss index when receiving antenna 1 transmits a test signal to receiving antenna 2, and is a fixed data measured through experiments.

[0079] P r13 is the signal power (dBm) received by receiving antenna 3 when receiving antenna 1 transmits a test signal to receiving antenna 3; n 13 It is the path loss index when receiving antenna 1 transmits a test signal to receiving antenna 3, and is a fixed data measured through experiments.

[0080] P t2is the signal power (dBm) transmitted by receiving antenna 2. The default transmit signal power is fixed; P r23 is the signal power (dBm) received by receiving antenna 3 when receiving antenna 2 transmits a test signal to receiving antenna 3; n 23 It is the path loss index when receiving antenna 2 transmits a test signal to receiving antenna 3, and is a fixed data measured through experiments.

[0081] According to the above formula, the distance d between receiving antennas 1 and 2 is calculated respectively: 12 , the distance d between receiving antennas 1 and 3 13 , and the distance d between receiving antennas 2 and 3 23 .

[0082] S2-3. Calculate the position coordinates of the three receiving antennas according to the distance between every two receiving antennas, as follows.

[0083] Arrange receiving antennas 1, 2, and 3 on the same horizontal plane. Assume that the coordinates of receiving antenna 1 are the origin (0, 0, 0), the coordinates of receiving antenna 2 are (x2, y2, 0), and the coordinates of receiving antenna 3 are (x3, y3, 0). The calculation formula is:

[0084]

[0085] Solve the above equations and calculate the position coordinates of receiving antennas 1, 2, and 3 respectively.

[0086] S2-4, the wireless microphone started by the speaker transmits a test signal to each receiving antenna, and measures the signal power P of the wireless microphone obtained when receiving antennas 1, 2, and 3 receive the test signal transmitted by the wireless microphone respectively. r1k , P r2k , P r3k .

[0087] This step has the same calculation principle as step S2-1. According to RSSI technology, the wireless microphone activated by the speaker transmits test signals to receiving antennas 1, 2, and 3 respectively, and measures the strength of the test signals received by receiving antennas 1, 2, and 3, so as to facilitate the subsequent calculation of the distance between the wireless microphone and each receiving antenna, as follows.

[0088] Suppose the wireless microphone turned on by the speaker is wireless microphone k (1≤k≤n, n≥1), which represents any wireless microphone.

[0089] The wireless microphone k transmits a test signal to the receiving antenna 1, and the transmitted signal power is P t1 , and measure the signal power received by receiving antenna 1, denoted as P r1k ;

[0090] The wireless microphone k transmits a test signal to the receiving antenna 2, and the transmission signal power is P t2 , and measure the signal power received by receiving antenna 2, denoted as P r2k ;

[0091] The wireless microphone k transmits a test signal to the receiving antenna 3, and the transmission signal power is P t3 , and measure the signal power received by receiving antenna 3, denoted as P r3k .

[0092] S2-5, according to the obtained signal power P r1k , P r2k , P r3k , calculate the distance d between the speaker's wireless microphone and receiving antennas 1, 2, and 3 k1 d k2 d k3 .

[0093] The calculation principle of this step is the same as that of step S2-2. Assume that the distance between the wireless microphone k (1≤k≤n, n≥1) and the receiving antenna 1 is d k1 , the distance between the wireless microphone k (1≤k≤n, n≥1) and the receiving antenna 2 is d k2 , the distance between the wireless microphone k (1≤k≤n, n≥1) and the receiving antenna 3 is d k3 , the calculation formula is:

[0094]

[0095] Among them, P t1 is the signal power (dBm) transmitted by the wireless microphone k to the receiving antenna 1. The default transmission signal power is fixed; P r1k is the signal power (dBm) received by receiving antenna 1 when wireless microphone k transmits a test signal to receiving antenna 1; n 1k is the path loss index when the wireless microphone k transmits a test signal to the receiving antenna 1, and is a fixed data measured through experiments.

[0096] P t2 is the signal power (dBm) transmitted by the wireless microphone k to the receiving antenna 2. The default transmission signal power is fixed; P r2k is the signal power (dBm) received by receiving antenna 2 when wireless microphone k transmits a test signal to receiving antenna 2; n 2k is the path loss index when the wireless microphone k transmits a test signal to the receiving antenna 2, and is a fixed data measured through experiments.

[0097] P t3 is the signal power (dBm) transmitted by the wireless microphone k to the receiving antenna 3. The default transmission signal power is fixed; Pr3k is the signal power (dBm) received by the receiving antenna 3 when the wireless microphone k transmits the test signal to the receiving antenna 3; n 3k is the path loss index when the wireless microphone k transmits a test signal to the receiving antenna 3, and is a fixed data measured through experiments.

[0098] According to the above formula, the distance d between the wireless microphone k turned on by the speaker and the receiving antenna 1 is calculated respectively: k1 , the distance d between the wireless microphone k and the receiving antenna 2 k2 , the distance d between the wireless microphone k and the receiving antenna 3 k3 .

[0099] S2-6, according to the distance d between the wireless microphone k turned on by the speaker and each receiving antenna k1 d k2 d k3 , calculate the location coordinates of the wireless microphone.

[0100] The calculation principle of this step is the same as that of step S2-3. Assuming the coordinates of the wireless microphone k are (x, y, z), the calculation formula is:

[0101]

[0102] The position coordinates of the wireless microphone k turned on by the speaker can be calculated by the above equations, and then the obtained position coordinates are sent to the conference host.

[0103] S3. The conference host receives the position coordinates of the wireless microphone k turned on by the speaker, as well as the audio signal of the wireless microphone k, and controls the camera to automatically track the speaker according to the position coordinates of the wireless microphone k, and transmits the audio signal of the wireless microphone k to the power amplifier speaker for external playback.

[0104] In specific implementation, after receiving the position coordinates of the wireless microphone k, the conference host will drive the camera to adjust the shooting angle and focus accordingly through control instructions according to the position coordinate information to ensure that the speaker is always in the center of the picture. At the same time, the conference host will also process and mix the received audio signals, amplify them and play them out through the speaker system to ensure clear sound quality. In addition, the conference system will also transmit the speaker's picture to the display screen in real time.

[0105] Example 2: Figure 1 As shown, the present invention provides a system for automatic tracking and shooting of wireless microphones, which is used to implement the method for automatic tracking and shooting of wireless microphones, including n wireless microphones, receiving antennas 1, 2, and 3 arranged on the same horizontal plane, a signal strength detection and coordinate calculator, a conference host, m cameras, and a power amplifier speaker, where n≥1 and m≥1 are specifically introduced as follows.

[0106] (1) The n wireless microphones are electrically connected to receiving antennas 1, 2, and 3 respectively through wireless modulation signals, so that the speaker turns on the wireless microphone to speak.

[0107] When implementing it, Figure 1 As shown, signal 1 is a wireless modulated signal. The wireless microphone is used to allow the speaker to speak without being restricted by cables, by converting the sound into an electrical signal and then modulating it into a radio wave for transmission.

[0108] (2) The receiving antennas 1, 2, and 3 are electrically connected to the signal strength detection and coordinate calculator respectively, and are used to transmit the audio signal output by the wireless microphone to the signal strength detection and coordinate calculator.

[0109] When implementing it, Figure 1 As shown, signal 2 is the wired signal converted by the antenna. The receiving antennas 1, 2, and 3 are used to receive the radio waves emitted by the wireless microphone and convert them into wired electrical signals for further processing.

[0110] It should be noted that the system of the present invention is equipped with three receiving antennas, which are evenly distributed on the same horizontal plane of the conference room or venue. This has two main purposes:

[0111] a. Extended reception range: The coverage of a single receiving antenna is limited, but by deploying multiple receiving antennas, the overall reception area can be effectively expanded, thereby enhancing the reception strength of the signal. This layout ensures that no matter where the speaker is in the room, the signal from the microphone can be clearly captured by at least one receiving antenna, thereby improving the quality of signal transmission.

[0112] b. Provide positioning reference: The different installation positions of the three receiving antennas provide a key reference for the position analysis of the wireless microphone. During the system initialization phase, each receiving antenna will transmit a test signal, and the other receiving antennas will receive these signals. By measuring the strength of these signals, the system can calculate the mutual distance between each two receiving antennas, providing the necessary data support for the subsequent positioning algorithm.

[0113] (3) The signal strength detection and coordinate calculator is electrically connected to the conference host, and is used to receive the audio signals transmitted by the receiving antennas 1, 2, and 3, and calculate the position coordinates of the wireless microphone, and then transmit the audio signal with the maximum signal strength and the position coordinates of the wireless microphone to the conference host.

[0114] When implementing it, Figure 1As shown, 3 signals are the audio signal output by the wireless microphone and the wireless microphone position coordinate signal. The signal strength detection and coordinate calculator is the core of the system of the present invention, including three antenna input interfaces, a CPU, and an output interface. The CPU contains an algorithm for realizing signal strength detection and coordinate calculation, that is, by measuring the signal strength received by different receiving antennas, the distance between the wireless microphone and each receiving antenna is estimated, and the approximate position coordinates of the wireless microphone are calculated using this distance information. The audio signal output by the wireless microphone and the position coordinate signal of the wireless microphone are transmitted to the conference host.

[0115] In specific implementation, the conference host is responsible for receiving signal strength detection and position coordinates sent by the coordinate calculator, and controlling the camera to automatically track the speaker. It also drives the camera to make corresponding angle adjustments and focus through control instructions based on this information to ensure that the speaker is always in the center of the picture.

[0116] (4) The conference host is electrically connected to m cameras through camera control signals, and is electrically connected to the power amplifier speaker, for receiving the audio signal transmitted by the signal strength detection and coordinate calculator, as well as the position coordinates of the wireless microphone, and controls the camera to automatically track the speaker according to the position coordinates of the wireless microphone, and transmits the audio signal of the wireless microphone to the power amplifier speaker.

[0117] When implementing it, Figure 1 As shown, signal 4 is the camera control signal. The conference host drives the camera to adjust the angle and focus accordingly through control instructions to ensure that the speaker is always in the center of the picture. Signal 6 is the analog audio signal. The conference host is responsible for processing the audio signal and sending the processed signal to the power amplifier speaker for sound amplification to ensure clear sound quality.

[0118] (5) The m cameras are used to automatically adjust the shooting angle and focus according to the conference host camera control signal to obtain the best speaker image.

[0119] In a specific implementation, the m cameras automatically capture the speaker's image according to the position coordinates of the wireless microphone, and the m cameras automatically adjust the shooting angle and focus according to the instructions of the conference host to obtain the best speaker image.

[0120] (6) The power amplifier speaker is used to receive the audio signal of the wireless microphone and play the audio signal externally.

[0121] When implementing it, Figure 1 As shown, the power amplifier speaker is used to amplify the audio signal processed by the conference host and play it through the power amplifier speaker to ensure that all participants can hear clear sound.

[0122] In other embodiments, the system of the present invention further comprises a display screen; the display screen is electrically connected to m cameras respectively. Figure 1 As shown, signal 5 is a video signal.

[0123] In specific implementation, the camera is used to capture the speaker's image and transmit the video signal to the display screen. The display screen is used to display the speaker's image captured by the camera in real time, so that the participants can see the speaker's real-time video.

[0124] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, the technical solutions recorded in the aforementioned embodiments can be modified, or some of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the idea and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for automatic tracking shooting with a wireless microphone, characterized in that: The steps include: S1. The speaker turns on any wireless microphone to speak, and the audio signal output by the wireless microphone is transmitted to the signal strength detection and coordinate calculator via receiving antennas 1, 2, and 3 respectively; S2, signal strength detection and coordinate calculator receives the audio signals transmitted by receiving antennas 1, 2, and 3, calculates the position coordinates of the wireless microphone, and then transmits the audio signal with the largest signal strength and the position coordinates of the wireless microphone to the conference host; S3, the conference host receives the audio signal transmitted by the signal strength detection and coordinate calculator, as well as the position coordinates of the wireless microphone, and controls the camera to automatically track the speaker according to the position coordinates of the wireless microphone, and transmits the audio signal of the wireless microphone to the power amplifier speaker for external playback.

2. The method for automatic tracking and shooting of a wireless microphone according to claim 1, characterized in that: In S2, calculating the position coordinates of the wireless microphone includes the following sub-steps: S2-1, respectively measure the signal power received by receiving antenna 2 when receiving antenna 1 transmits a test signal, the signal power received by receiving antenna 3 when receiving antenna 1 transmits a test signal, and the signal power received by receiving antenna 3 when receiving antenna 2 transmits a test signal; S2-2, according to the three measured signal powers, respectively calculate the distances between receiving antennas 1 and 2, receiving antennas 1 and 3, and receiving antennas 2 and 3; S2-3, calculating the position coordinates of receiving antennas 1, 2, and 3 respectively according to the calculated distances between receiving antennas 1 and 2, receiving antennas 1 and 3, and receiving antennas 2 and 3; S2-4, respectively measure the signal power received by receiving antennas 1, 2, and 3 when the wireless microphone activated by the speaker transmits a test signal to receiving antennas 1, 2, and 3; S2-5, calculating the distances between the wireless microphone and the receiving antennas 1, 2, and 3 respectively according to the measured signal powers received by the receiving antennas 1, 2, and 3; S2-6. Calculate the position coordinates of the wireless microphone according to the calculated distance between the wireless microphone and the receiving antennas 1, 2, and 3.

3. The method for automatic tracking and shooting of a wireless microphone according to claim 2, characterized in that: The S2-1 includes the following sub-steps: The test signal is transmitted from receiving antenna 1 to receiving antenna 2, and the transmission signal power is P t1 , and measure the signal power received by receiving antenna 2, denoted as P r12 ; The test signal is transmitted from receiving antenna 1 to receiving antenna 3, and the transmission signal power is P t1 , and measure the signal power received by receiving antenna 3, denoted as P r13 ; The test signal is transmitted from receiving antenna 2 to receiving antenna 3, and the transmission signal power is P t2 , and measure the signal power received by receiving antenna 3, denoted as P r23 .

4. The method for automatic tracking and shooting of a wireless microphone according to claim 3, characterized in that: The S2-2 comprises the following sub-steps: Assume d 12 is the distance between receiving antenna 1 and receiving antenna 2, d 13 is the distance between receiving antenna 1 and receiving antenna 3, d 23 is the distance between receiving antenna 2 and receiving antenna 3, the calculation formula is: Among them, P t1 is the signal power transmitted by receiving antenna 1; P r12 is the signal power received by receiving antenna 2 when receiving antenna 1 transmits a test signal to receiving antenna 2; n 12 is the path loss index when receiving antenna 1 transmits the test signal to receiving antenna 2; P r13 is the signal power received by receiving antenna 3 when receiving antenna 1 transmits a test signal to receiving antenna 3; n 13 is the path loss index when receiving antenna 1 transmits the test signal to receiving antenna 3; P t2 is the signal power transmitted by receiving antenna 2; P r23 is the signal power received by receiving antenna 3 when receiving antenna 2 transmits a test signal to receiving antenna 3; n 23 It is the path loss index when receiving antenna 2 transmits the test signal to receiving antenna 3.

5. The method for automatic tracking and shooting of a wireless microphone according to claim 4, characterized in that: The S2-3 comprises the following sub-steps: Arrange receiving antennas 1, 2, and 3 on the same horizontal plane. Assume that the coordinates of receiving antenna 1 are the origin (0, 0, 0), the coordinates of receiving antenna 2 are (x2, y2, 0), and the coordinates of receiving antenna 3 are (x3, y3, 0). The calculation formula is:

6. The method for automatic tracking and shooting of a wireless microphone according to claim 5, characterized in that: The S2-4 comprises the following sub-steps: Let the wireless microphone turned on by the speaker be wireless microphone k (1≤k≤n, n≥1); The wireless microphone k transmits a test signal to the receiving antenna 1, and the transmission signal power is P t1 , and measure the signal power received by receiving antenna 1, denoted as P r1k ; The wireless microphone k transmits a test signal to the receiving antenna 2, and the transmission signal power is P t2 , and measure the signal power received by receiving antenna 2, denoted as P r2k ; The wireless microphone k transmits a test signal to the receiving antenna 3, and the transmission signal power is P t3 , and measure the signal power received by receiving antenna 2, denoted as P r3k .

7. The method for automatic tracking and shooting of a wireless microphone according to claim 6, characterized in that: The S2-5 comprises the following sub-steps: Assume that the distance between the wireless microphone k and the receiving antenna 1 is d k1 , the distance between the wireless microphone k and the receiving antenna 2 is d k2 , the distance between the wireless microphone k and the receiving antenna 2 is d k3 , the calculation formula is: Among them, P t1 is the signal power transmitted by wireless microphone k to receiving antenna 1; P r1k is the signal power received by receiving antenna 1 when wireless microphone k transmits a test signal to receiving antenna 1; n 1k is the path loss index when the wireless microphone k transmits the test signal to the receiving antenna 1; P t2 is the signal power transmitted by wireless microphone k to receiving antenna 2; P r2k is the signal power received by receiving antenna 2 when wireless microphone k transmits a test signal to receiving antenna 2; n 2k is the path loss index when the wireless microphone k transmits the test signal to the receiving antenna 2; P t3 is the signal power transmitted by the wireless microphone k to the receiving antenna 3; P r3k is the signal power received by the receiving antenna 3 when the receiving antenna 3 transmits the test signal to the wireless microphone k; n 3k is the path loss index when the wireless microphone k transmits the test signal to the receiving antenna 3.

8. The method for automatic tracking and shooting of a wireless microphone according to claim 7, characterized in that: The S2-6 comprises the following sub-steps: Assuming the coordinates of the wireless microphone are (x, y, z), the calculation formula is:

9. A system for automatic tracking and shooting of a wireless microphone, to implement a method for automatic tracking and shooting of a wireless microphone as claimed in any one of claims 1 to 8, characterized in that: It includes n wireless microphones, receiving antennas 1, 2, and 3 arranged on the same horizontal plane, a signal strength detector and a coordinate calculator, a conference host, m cameras, and a power amplifier speaker, and n≥1, m≥1; The wireless microphone is electrically connected to receiving antennas 1, 2, and 3 respectively through wireless modulation signals; it is used for the speaker to turn on the wireless microphone to speak; The receiving antennas 1, 2, and 3 are electrically connected to the signal strength detection and coordinate calculator respectively; and are used to transmit the audio signal output by the wireless microphone to the signal strength detection and coordinate calculator; The signal strength detection and coordinate calculator is electrically connected to the conference host; it is used to receive the audio signals transmitted by the receiving antennas 1, 2, and 3, and calculate the position coordinates of the wireless microphone, and then transmit the audio signal with the maximum signal strength and the position coordinates of the wireless microphone to the conference host; The conference host is electrically connected to m cameras and an amplifier speaker through camera control signals; it is used to receive the audio signal transmitted by the signal strength detection and coordinate calculator, as well as the position coordinates of the wireless microphone, and control the camera to automatically track the speaker according to the position coordinates of the wireless microphone, and at the same time transmit the audio signal of the wireless microphone to the amplifier speaker for external playback.

10. The system for automatic tracking and shooting of a wireless microphone according to claim 9, characterized in that: Also includes display screen; The display screens are electrically connected to m cameras respectively, and are used to display the speaker's image in real time.

Images