Audio transmission method, wireless terminal and audio equipment

Abstract

The invention relates to the field of audio playing, in particular to an audio transmission method, a wireless terminal and audio equipment, and the method comprises the steps: receiving a wireless communication connection request sent by the wireless terminal; establishing wireless communication connection with a wireless terminal; based on the wireless terminal, configuring reference signal configuration parameters for the wireless terminal, and sending the reference signal configuration parameters to the wireless terminal; receiving a reference signal sent by the wireless terminal; based on the reference signal, terminal position information and sound field information of the wireless terminal are calculated through a wireless positioning algorithm; setting an equalization parameter and a reverberation parameter of the audio signal based on the terminal position information and the sound field information; and playing the audio based on the equalization parameter and the reverberation parameter. According to the invention, a user does not need to hold the pickup device and carry out complex operation, so that the operation complexity is greatly reduced. In addition, due to the fact that additional pickup equipment and a digital signal processing module are not needed, the equipment cost can be remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the field of audio playback, and in particular to an audio transmission method, a wireless terminal and an audio device. Background Art

[0002] In recent years, audio devices such as home theaters, smart speakers, and loudspeakers have been widely used in the market. However, the sound experience of these devices is often affected by the room environment (such as size, layout, wall material, etc.) and the sound field (that is, the propagation of sound in space, including absorption, reflection, scattering, etc.). These factors will affect the spatial sense, immersion, and stereoscopic sense of the sound effect. At the same time, users will have different auditory feelings in different positions in the same room. Therefore, it is very important to eliminate the influence of the sound field, restore the spatial sound effect of music, and bring users an excellent listening experience.

[0003] To solve this problem, the existing technology often adopts sound field calibration technology based on sound signals: the audio device sends a known sound signal; the user holds a sound pickup device (such as a mobile phone, microphone, professional audio acquisition equipment, etc.) to collect the sound signal played by the audio device; then the environment and user position information are obtained through the digital signal processing module, and the audio signal equalization parameters are calculated; finally, the audio device receives the equalization parameters and performs equalization processing on the played sound source.

[0004] However, this technology has two major disadvantages: first, users need to hold the sound pickup device and perform complex operations, such as collecting the sound signals played by the audio device multiple times and recalibrating as the room layout and user position change, which greatly increases the complexity of the user's operation. Second, the need for additional sound pickup devices and corresponding digital signal processing modules significantly increases the cost of the equipment. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an audio transmission method, a wireless terminal and an audio device.

[0006] The first aspect of the present invention discloses an audio transmission method, which is applied to an audio device, and the method comprises:

[0007] receiving a wireless communication connection request sent by a wireless terminal;

[0008] Establishing a wireless communication connection with the wireless terminal;

[0009] Based on the wireless terminal, configure reference signal configuration parameters for it, and send them to the wireless terminal;

[0010] receiving a reference signal sent by the wireless terminal;

[0011] Based on the reference signal, calculating the terminal position information and the sound field information of the wireless terminal through a wireless positioning algorithm;

[0012] Based on the terminal position information and the sound field information, equalization parameters and reverberation parameters of the audio signal are set.

[0013] Further, based on the wireless terminal, the step of configuring reference signal configuration parameters for the wireless terminal includes:

[0014] According to the channel condition between the wireless terminal and the audio device, setting the modulation method and the modulation order in the reference signal configuration parameters;

[0015] According to the wireless communication connection request, setting the center frequency and bandwidth in the reference signal configuration parameters;

[0016] The sending duration in the reference signal configuration parameters is set according to the coherent processing duration of the wireless positioning signal of the audio device.

[0017] Furthermore, the wireless positioning algorithm includes: a matched filtering algorithm, a two-dimensional Fourier transform algorithm or a MUSIC algorithm.

[0018] Further, the step of calculating the terminal position information and the sound field information of the wireless terminal by a wireless positioning algorithm based on the reference signal includes:

[0019] Performing time domain sampling and Fourier transformation on the reference signal to obtain frequency domain signals of multiple transmission paths, including the frequency domain signal of a direct path and the frequency domain signals of multiple multipaths;

[0020] Obtaining a corresponding channel transmission coefficient between the wireless terminal and the audio device according to each of the frequency domain signals;

[0021] Performing a two-dimensional Fourier transform on each of the channel transmission coefficients to obtain a corresponding range-Doppler spectrum;

[0022] Search each of the range-Doppler spectra to obtain a corresponding range estimate and a corresponding velocity estimate;

[0023] Performing a one-dimensional Fourier transform on each of the channel transmission coefficients in the spatial domain to obtain a corresponding angle estimate;

[0024] Based on the distance estimation and the angle estimation corresponding to the direct path, the terminal position information of the wireless terminal is determined, and based on the channel transmission coefficients of all the transmission paths, the sound field information is determined.

[0025] Further, the reference signal configuration parameter further includes a transmission interval duration type, and the transmission interval duration type is used to instruct the wireless terminal to transmit the reference signal according to a specified interval duration;

[0026] And, the audio transmission method further includes:

[0027] When the speed estimate corresponding to the direct path changes, the transmission interval duration type in the reference signal configuration parameter is updated according to the speed estimate, and the updated reference signal configuration parameter is sent to the wireless terminal.

[0028] Furthermore, the step of setting equalization parameters and reverberation parameters of the audio signal based on the terminal position information and the sound field information includes:

[0029] Using the terminal location information as the best listening area;

[0030] According to the optimal listening area and the sound field information, setting a target frequency response curve;

[0031] Setting equalization parameters according to the target frequency response curve;

[0032] Calculating the volume of the site based on the distance estimates corresponding to all of the transmission paths;

[0033] Reverberation parameters are set according to the volume of the venue, and the reverberation parameters include reverberation duration, filter length, pre-delay, reverberation dry-wet ratio, and filter feedback coefficient.

[0034] A second aspect of the present invention discloses an audio transmission method, which is applied to a wireless terminal. The method comprises:

[0035] Sending a wireless communication connection request to the audio device;

[0036] Receiving a reference signal configuration parameter sent by the audio device;

[0037] A reference signal is sent to the audio device according to the reference signal configuration parameter.

[0038] Further, according to the reference signal configuration parameter, the step of sending the reference signal to the audio device includes:

[0039] Using the modulation method and modulation order in the reference signal configuration parameters to generate a corresponding reference signal;

[0040] The reference signal is sent according to the center frequency, frequency bandwidth, and sending duration in the reference signal configuration parameters.

[0041] The third aspect of the present invention discloses an audio device capable of executing the audio transmission method disclosed in any one of the first aspect of the present invention.

[0042] The fourth aspect of the present invention discloses a wireless terminal capable of executing the audio transmission method disclosed in any one of the second aspects of the present invention.

[0043] The present invention does not require the user to hold the sound pickup device and perform complicated operations, thereby greatly reducing the complexity of the operation. Moreover, since no additional sound pickup device and digital signal processing module are required, the present invention can significantly reduce the equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 is a schematic diagram of a scenario in which an audio transmission method is used between an audio device and a wireless terminal according to an embodiment of the present invention;

[0046] Figure 2 It is a flowchart of an audio transmission method disclosed in an embodiment of the present invention;

[0047] Figure 3 It is a schematic diagram of distance estimation and angle estimation between an audio device and a wireless terminal disclosed in an embodiment of the present invention;

[0048] Figure 4 It is a three-dimensional distance-angle spectrum detection diagram disclosed in an embodiment of the present invention;

[0049] Figure 5 It is a two-dimensional distance-angle spectrum detection diagram disclosed in an embodiment of the present invention;

[0050] Figure 6 It is a flowchart of another audio transmission method disclosed in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the present invention.

[0052] The terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, device, or product end including a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.

[0053] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] See also Figure 1 As shown, Figure 1 It is a schematic diagram of a scenario in which an audio transmission method is used between an audio device and a wireless terminal according to an embodiment of the present invention. Figure 1 The wireless terminal in the communication can be any device that supports wireless communication connection, such as mobile phones, tablet computers, computers, smart watches, smart glasses, smart rings, etc. Figure 1 The audio device in the description can be any audio device that supports wireless communication connection, such as smart speakers, Bluetooth headsets, smart speakers, etc. Both the wireless terminal and the audio device support the same wireless connection, such as Bluetooth, WiFi, etc. The audio devices all have wireless communication modules, including transmitters, receivers, modem processors, digital-to-analog converters, antennas, etc. The distance between the wireless terminal and the audio device can support wireless connection between the two. The location of the wireless terminal is the location where the user chooses to listen to the audio played by the audio device.

[0055] See also Figure 2 As shown, Figure 2 1 is a flow chart of an audio transmission method disclosed in an embodiment of the present invention. The audio transmission method is applied to an audio device, which may be a Bluetooth speaker, a home theater, a Bluetooth headset, etc., and is not limited in the embodiment of the present invention. Figure 2 As shown, the audio transmission method may include the following operations:

[0056] S201, receiving a wireless communication connection request sent by a wireless terminal;

[0057] In this optional embodiment, the wireless communication connection can be a Bluetooth connection, a WiFi (wireless local area network protocol) connection, etc., and the wireless communication connection request can be a preamble code / pilot in the Bluetooth protocol or WiFi protocol, or it can be an SSB (synchronization signal block) in 3GPP5G NR (3rd Generation Partnership Project 5G New Radio).

[0058] S202, establishing a wireless communication connection with the wireless terminal;

[0059] S203. Based on the wireless terminal, configure reference signal configuration parameters for the wireless terminal, and send the configuration parameters to the wireless terminal;

[0060] In an optional embodiment, based on the wireless terminal, the step of configuring reference signal configuration parameters for the wireless terminal includes:

[0061] According to the channel condition between the wireless terminal and the audio device, setting the modulation method and the modulation order in the reference signal configuration parameters;

[0062] According to the wireless communication connection request, setting the center frequency and bandwidth in the reference signal configuration parameters;

[0063] The sending duration in the reference signal configuration parameters is set according to the coherent processing duration of the wireless positioning signal of the audio device.

[0064] In this optional embodiment, the center frequency, modulation method and modulation order can follow the standard protocol default value or adopt a given value according to the parameters carried in the wireless communication connection request. For example, according to the IEEE 802.11 technical standard specified by 3GPP, in the WiFi scenario, the 2.4G or 5G working frequency band can be selected, and the modulation method and modulation order can be based on the channel conditions. When the channel conditions are poor, BSK, QAM modulation can be selected, and when the channel conditions are good, 8QAM, 16QAM and other high-order modulation can be selected, or the currently widely used OFDM modulation can be selected. In particular, the bandwidth (B) is recommended to be above 40MHz, and the transmission duration is above 1ms (to ensure that the coherent processing duration of the audio device is above 1ms). The sequence selected by the modulation method in the reference signal configuration parameters must be designed to have good autocorrelation and cross-correlation, such as M code, ZC sequence, Chu sequence, etc.

[0065] In an optional embodiment, the audio device can detect the wireless communication connection by polling, receive the connection application of the wireless terminal, and determine the number of wireless terminals. When the number of wireless terminals is multiple, the connection can be made through time division multiple access (TDMA), frequency division multiple access (FDMA), code division multiple access (CDMA), orthogonal frequency division multiple access (OFDMA). Exemplarily, if wireless communication connection requests are received from three wireless terminals, the TDMA multiple access method can be used to specify the time slots and periods for the three wireless terminals to send RS. According to the number of wireless terminals, the reference signal configuration parameters of the reference signal (RS) used by different wireless terminals for wireless positioning and tracking are configured. The reference signal configuration parameters of the audio device can be used to avoid signal interference between different wireless terminals.

[0066] S204, receiving a reference signal sent by the wireless terminal;

[0067] S205. Calculate the terminal position information and the sound field information of the wireless terminal through a wireless positioning algorithm based on the reference signal;

[0068] In an optional embodiment, the wireless positioning algorithm includes: a matched filtering algorithm, a two-dimensional Fourier transform algorithm or a MUSIC algorithm.

[0069] The matched filter algorithm is a signal processing algorithm that is often used to detect and estimate known signals at the receiving end. The principle is to perform correlation operations between the received signal and the known signal to improve the signal-to-noise ratio and detection performance. It is widely used in radar, communication systems and other fields, especially in digital communication systems for signal detection and demodulation at the receiving end. The output of the matched filter reaches its maximum value when a matching signal is received, so it can effectively distinguish between signals and noise, improving the sensitivity and performance of the system.

[0070] The two-dimensional Fourier transform algorithm is a commonly used algorithm in image processing and signal processing, which is used to convert two-dimensional spatial domain signals into frequency domain. Through the two-dimensional Fourier transform, the spectral characteristics, filtering, compression, etc. of the image can be analyzed. In digital image processing, the two-dimensional Fourier transform is often used for applications such as image enhancement, denoising, feature extraction, etc. It is also used in frequency domain analysis and modulation and demodulation processes in communication systems.

[0071] MUSIC algorithm (Multiple signal classification algorithm) is a high-resolution spectrum estimation algorithm used to estimate the direction of a signal, and is often used for direction estimation in array signal processing. The algorithm can accurately estimate the direction of arrival of the input signal by analyzing the signal subspace, with high resolution and low computational complexity. The MUSIC algorithm is widely used in radar, communication, wireless positioning and other fields, and is often used to solve problems such as signal source positioning and beamforming, and is particularly suitable for signal processing and positioning tasks in multipath channel environments.

[0072] The wireless positioning algorithm can estimate the distance and angle between the wireless terminal and the audio device, as well as the location, size, and other room information of the main scattering objects in the environment. Combined with geometric characteristics, the scene of the audio device and wireless terminal in the sound field can be reconstructed.

[0073] In an optional embodiment, the step of calculating the terminal position information and the sound field information of the wireless terminal by a wireless positioning algorithm based on the reference signal includes:

[0074] Performing time domain sampling and Fourier transformation on the reference signal to obtain frequency domain signals of multiple transmission paths, including the frequency domain signal of a direct path and the frequency domain signals of multiple multipaths;

[0075] Obtaining a corresponding channel transmission coefficient between the wireless terminal and the audio device according to each of the frequency domain signals;

[0076] Performing a two-dimensional Fourier transform on each of the channel transmission coefficients to obtain a corresponding range-Doppler spectrum;

[0077] Search each of the range-Doppler spectra to obtain a corresponding range estimate and a corresponding velocity estimate;

[0078] Performing a one-dimensional Fourier transform on each of the channel transmission coefficients in the spatial domain to obtain a corresponding angle estimate;

[0079] Based on the distance estimation and the angle estimation corresponding to the direct path, the terminal position information of the wireless terminal is determined, and based on the channel transmission coefficients of all the transmission paths, the sound field information is determined.

[0080] After the audio device establishes a connection with the wireless terminal, t The reference signal y after scattering by a point target u (t) is:

[0081]

[0082] Among them, b l represents the attenuation coefficient of the reflected echo of the reference signal in multipath l, τ l represents the delay of the reflected echo of the reference signal in multipath l, f d,l represents the Doppler shift of the reflected echo of the reference signal in the multipath l. In particular, l = 0 represents a direct path, that is, the reference signal is sent directly from the wireless terminal to the audio device, and l>0 represents a multipath, that is, the reference signal is sent to the audio device after being reflected by other objects. n(t) is the variance Gaussian white noise, t represents the time variable, x u represents the time domain signal sent by wireless terminal u, e represents the base of natural logarithm, j represents the imaginary unit, and f d,l t means f d,l Phase change with respect to time, σ n represents the standard deviation of Gaussian white noise.

[0083] The received target echo removes the CP (Cyclic Prefix) and the CP (Cyclic Prefix) and then undergoes a sampling interval of T. s =1 / (N c Δf) time domain sampling and Fourier transform, its frequency domain signal can be expressed as:

[0084]

[0085] Among them, N(n,μ) represents Gaussian white noise in the frequency domain, n represents the frequency index, μ represents the time index, and μ c Indicates the number of subcarriers in an OFDM symbol, T s represents the sampling interval, T o Indicates the duration of an OFDM symbol including data and CP duration, X u (n, μ) represents the value of the time domain signal sent by the wireless terminal at discrete time n and frequency μ.

[0086] Since the positions of the resource elements used to transmit RS in the frequency domain and the time domain are known, the transmission sequence of the RS signal is also known. r After extracting the received RS, the randomness of the transmitted sequence can be eliminated by dot division to obtain the channel transmission coefficient H rad :

[0087]

[0088] Among them, I rrepresents a set of resource elements related to a reference signal (RS), n represents a frequency index, and μ represents a time index.

[0089] After two-dimensional Fourier transform, the RD (Range-Doppler) spectrum of the target can be expressed as:

[0090]

[0091] Where p = 0, 1, ..., N c ′,q=0,1,…,N s ′,N c ′ and N s ′ are the points of two Fourier transforms, N s Represents the number of OFDM symbols in an OFDM signal, N c Represents the number of subcarriers in an OFDM symbol. By searching the RD spectrum value, if it is greater than a certain detection threshold, then The corresponding distance estimation and speed estimation of the lth multipath are and Among them, c0 and f c represent the speed of light and the center frequency respectively, represents the index of distance and velocity determined after performing a 2D Fourier transform and searching the RD spectrum, represents M(p,q) relative to the index and The target power, Δ f represents the subcarrier spacing, T o Represents the duration of a single OFDM symbol. Similarly, the channel transmission coefficient H rad By performing a one-dimensional Fourier transform in the spatial domain, an angle estimate can be obtained.

[0092] When l = 0, after obtaining the distance d0 and angle θ0 of the wireless terminal on the direct path, we can Figure 3 As shown, the position of the wireless terminal is confirmed based on the geometric relationship; after obtaining the speed v0 information, the motion state of the wireless terminal is confirmed. Figure 3 is a schematic diagram of distance estimation and angle estimation between an audio device and a wireless terminal disclosed in an embodiment of the present invention, Figure 3 d in i1 represents the distance estimate of wireless terminal 1, θ i1 represents the angle estimate of wireless terminal 1, d i2 represents the distance estimate of wireless terminal 2, θ i2 represents the angle estimate of wireless terminal 2, d i3 represents the distance estimate of wireless terminal 3, θ i3 Represents the angle estimate of wireless terminal 3.

[0093] When l>0, the channel transmission coefficients under each multipath between the audio device and the wireless terminal can be obtained, and the channel transmission coefficients under the direct path and all multipaths are used as the sound field information.

[0094] In one embodiment, the channel transmission coefficient H of each wireless terminal is combined rad , the average channel transmission coefficient can be obtained That is, the average sound field frequency response curve of the audio device from the wireless terminal.

[0095] Figure 4 A three-dimensional distance-angle spectrum detection diagram of distance estimation and angle estimation calculated based on the reference signal is shown, verifying the feasibility of the method of the present invention. Figure 4 The two coordinates of the midplane are angle and distance, and the vertical coordinate is amplitude. Figure 4 The figure shows the signal strengths of three wireless terminals, as well as the distance estimation and angle estimation calculated according to the audio transmission method of the present invention.

[0096] Figure 5 A two-dimensional distance-angle spectrum detection diagram of distance estimation and angle estimation calculated based on a reference signal in an actual scenario is shown. Figure 5 The horizontal axis is the distance, the vertical axis is the angle, UE1, UE2, and UE3 represent different wireless terminals respectively. In the brackets thereafter, the first number represents the distance in meters, and the second number represents the angle in degrees.

[0097] S206, setting equalization parameters and reverberation parameters of the audio signal based on the terminal position information and the sound field information;

[0098] In an optional embodiment, the step of setting equalization parameters and reverberation parameters of the audio signal based on the terminal position information and the sound field information includes:

[0099] Using the terminal location information as the best listening area;

[0100] According to the optimal listening area and the sound field information, setting a target frequency response curve;

[0101] Setting equalization parameters according to the target frequency response curve;

[0102] Calculating the volume of the site based on the distance estimates corresponding to all of the transmission paths;

[0103] Reverberation parameters are set according to the volume of the venue, and the reverberation parameters include reverberation duration, filter length, pre-delay, reverberation dry-wet ratio, and filter feedback coefficient.

[0104] In this optional embodiment, the terminal position information is used as the best listening area, and the head-related transfer function can be calculated based on the average channel transfer coefficient. By adjusting the IIR filter coefficients, that is, the equalization parameters, according to the given target frequency response curve T, approximation The influence of room effect can be eliminated. At the same time, the reverberation parameters can be adjusted in combination with the sound field information, such as pre-delay, the number of comb filters or all-pass filters, filter length, filter density, signal attenuation amplitude, etc., to enhance the user's immersion and stereoscopic sense in the best listening area. Exemplarily, the venue volume can be estimated based on the measured maximum multipath delay, so as to select appropriate reverberation parameters. If the venue volume is large, the reverberation time, comb filter and all-pass filter lengths can be increased; based on the number of multipaths in the early reflection time, a large number can reduce the pre-delay; based on the number of multipaths in the slow reflection time, the reverberation dry-wet ratio and the comb filter feedback coefficient are adjusted. A large number will reduce the wet gain and feedback coefficient accordingly.

[0105] In an optional embodiment, the reference signal configuration parameter further includes a transmission interval duration type, and the transmission interval duration type is used to guide the wireless terminal to send the reference signal according to a specified interval duration;

[0106] And, the audio transmission method further includes:

[0107] When the speed estimate corresponding to the direct path changes, the transmission interval duration type in the reference signal configuration parameter is updated according to the speed estimate, and the updated reference signal configuration parameter is sent to the wireless terminal.

[0108] In this optional embodiment, the transmission interval duration type may include periodic, semi-periodic or burst. Periodic means that the wireless terminal automatically sends RS to each audio device at a certain time interval; semi-periodic means that the wireless terminal automatically sends RS to each audio device at a certain time interval within a certain period of time. For example, once the audio source device detects that the speed estimate of the wireless terminal has changed, the transmission interval duration type in the reference signal configuration parameter can be updated to semi-periodic, and the wireless terminal continues to send RS signals, and when the speed estimate of the wireless terminal does not change, the transmission interval duration type in the reference signal configuration parameter is updated to periodic; burst means that when the wireless terminal is moving, it actively reports the movement instruction and sends RS to the audio device.

[0109] It can be seen that in this optional embodiment, when it is detected that the speed estimate corresponding to the direct path changes, the transmission interval duration type in the reference signal configuration parameter can be adaptively updated, and the updated parameter can be sent to the wireless terminal. This adaptive adjustment mechanism can dynamically optimize the transmission of the reference signal according to the changes in the position and speed of the wireless terminal to ensure the real-time and accuracy of the sound field information. It does not require the user to actively feedback or recalibrate the handheld radio device, but automatically detects changes in the environment and user position through an algorithm, which greatly improves the system's adaptive ability and user experience, making the sound field calibration process more intelligent and real-time.

[0110] See also Figure 6 As shown, Figure 6 1 is a flow chart of another audio transmission method disclosed in an embodiment of the present invention. The audio transmission method is applied to a wireless terminal. The wireless terminal may be a mobile phone, a tablet computer, a computer, a smart bracelet, etc., and the embodiment of the present invention does not limit this. Figure 6 As shown, the audio transmission method may include the following operations:

[0111] S601, sending a wireless communication connection request to an audio device;

[0112] In this optional embodiment, the wireless communication connection can be a Bluetooth connection, a WiFi (wireless local area network protocol) connection, etc., and the wireless communication connection request can be a preamble code / pilot in the Bluetooth protocol or WiFi protocol, or it can be an SSB (synchronization signal block) in 3GPP5G NR (3rd Generation Partnership Project 5G New Radio).

[0113] S602, receiving a reference signal configuration parameter sent by the audio device;

[0114] S603: Send a reference signal to the audio device according to the reference signal configuration parameters.

[0115] In an optional embodiment, the step of sending the reference signal to the audio device according to the reference signal configuration parameter includes:

[0116] Using the modulation method and modulation order in the reference signal configuration parameters to generate a corresponding reference signal;

[0117] The reference signal is sent according to the center frequency, frequency bandwidth, and sending duration in the reference signal configuration parameters.

[0118] Taking OFDM as an example, assuming that within a coherent processing time, the OFDM signal contains N s OFDM symbols and each symbol carries N cAfter inverse discrete Fourier transform and adding CP (Cyclic Prefix), the time domain signal of the reference signal sent by the wireless terminal is:

[0119]

[0120] Among them, X u (n,μ) is the symbol on the nth subcarrier in the μth OFDM symbol sent by the wireless terminal. If (n,μ)∈I d Indicates that the resource transmits modulated data, if (n,μ)∈I r Indicates that the resource transmits RS, Δ f represents the subcarrier spacing, T o represents the duration of a single OFDM symbol, u(t) is a rectangular pulse function, I r represents a set of resource elements related to the reference signal, I d Indicates other modulation data besides reference information.

[0121] The present invention provides an audio device capable of executing the audio transmission method applied to the audio device in any one of the aforementioned embodiments.

[0122] The present invention provides a wireless terminal capable of executing the audio transmission method applied to the wireless terminal in any one of the aforementioned embodiments.

[0123] In summary, the present invention discloses an audio transmission method, a wireless terminal, and an audio device. The present invention calculates the distance and angle of the wireless terminal according to the wireless positioning algorithm, thereby adjusting the equalization parameters and reverberation parameters in real time during the user's movement, without the need for the user to hold the sound pickup device and perform complex operations, thereby greatly reducing the complexity of the operation. Moreover, since no additional sound pickup device and digital signal processing module are required, the present invention can significantly reduce the cost of the equipment. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0124] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. An audio transmission method, applied to an audio device, characterized in that: The method comprises: receiving a wireless communication connection request sent by a wireless terminal; Establishing a wireless communication connection with the wireless terminal; Based on the wireless terminal, configure reference signal configuration parameters for it, and send them to the wireless terminal; receiving a reference signal sent by the wireless terminal; Based on the reference signal, calculating the terminal position information and the sound field information of the wireless terminal through a wireless positioning algorithm; Based on the terminal position information and the sound field information, equalization parameters and reverberation parameters of the audio signal are set.

2. The audio transmission method according to claim 1, characterized in that: Based on the wireless terminal, the step of configuring reference signal configuration parameters for the wireless terminal includes: According to the channel condition between the wireless terminal and the audio device, setting the modulation method and the modulation order in the reference signal configuration parameters; According to the wireless communication connection request, setting the center frequency and bandwidth in the reference signal configuration parameters; The sending duration in the reference signal configuration parameters is set according to the coherent processing duration of the wireless positioning signal of the audio device.

3. The audio transmission method according to claim 1, characterized in that: The wireless positioning algorithm includes: a matched filtering algorithm, a two-dimensional Fourier transform algorithm or a MUSIC algorithm.

4. The audio transmission method according to claim 1, characterized in that: The step of calculating the terminal position information and the sound field information of the wireless terminal by a wireless positioning algorithm based on the reference signal includes: Performing time domain sampling and Fourier transformation on the reference signal to obtain frequency domain signals of multiple transmission paths, including the frequency domain signal of a direct path and the frequency domain signals of multiple multipaths; Obtaining a corresponding channel transmission coefficient between the wireless terminal and the audio device according to each of the frequency domain signals; Performing a two-dimensional Fourier transform on each of the channel transmission coefficients to obtain a corresponding range-Doppler spectrum; Search each of the range-Doppler spectra to obtain a corresponding range estimate and a corresponding velocity estimate; Performing a one-dimensional Fourier transform on each of the channel transmission coefficients in the spatial domain to obtain a corresponding angle estimate; Based on the distance estimation and the angle estimation corresponding to the direct path, the terminal position information of the wireless terminal is determined, and based on the channel transmission coefficients of all the transmission paths, the sound field information is determined.

5. The audio transmission method according to claim 4, characterized in that: The reference signal configuration parameter further includes a transmission interval duration type, and the transmission interval duration type is used to instruct the wireless terminal to transmit the reference signal according to a specified interval duration; And, the audio transmission method further includes: When the speed estimate corresponding to the direct path changes, the transmission interval duration type in the reference signal configuration parameter is updated according to the speed estimate, and the updated reference signal configuration parameter is sent to the wireless terminal.

6. The audio transmission method according to claim 4, characterized in that: The step of setting equalization parameters and reverberation parameters of the audio signal based on the terminal position information and the sound field information comprises: Using the terminal location information as the best listening area; According to the optimal listening area and the sound field information, setting a target frequency response curve; Setting equalization parameters according to the target frequency response curve; Calculating the volume of the site based on the distance estimates corresponding to all of the transmission paths; Reverberation parameters are set according to the volume of the venue, and the reverberation parameters include reverberation duration, filter length, pre-delay, reverberation dry-wet ratio, and filter feedback coefficient.

7. An audio transmission method, applied to a wireless terminal, characterized in that: The method comprises: Sending a wireless communication connection request to the audio device; Receiving a reference signal configuration parameter sent by the audio device; A reference signal is sent to the audio device according to the reference signal configuration parameter.

8. An audio transmission method according to claim 7, characterized in that: The step of sending the reference signal to the audio device according to the reference signal configuration parameter comprises: Using the modulation method and modulation order in the reference signal configuration parameters to generate a corresponding reference signal; The reference signal is sent according to the center frequency, frequency bandwidth, and sending duration in the reference signal configuration parameters.

9. An audio device, characterized in that: The audio transmission method according to any one of claims 1 to 6 can be executed.

10. A wireless terminal, characterized in that: The audio transmission method according to any one of claims 7 or 8 can be executed.

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