CN114979972B - Audio broadcast source device and audio sharing method - Google Patents
Audio broadcast source device and audio sharing method Download PDFInfo
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- CN114979972B CN114979972B CN202210556583.0A CN202210556583A CN114979972B CN 114979972 B CN114979972 B CN 114979972B CN 202210556583 A CN202210556583 A CN 202210556583A CN 114979972 B CN114979972 B CN 114979972B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 135
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- 230000001360 synchronised effect Effects 0.000 description 23
- 238000010586 diagram Methods 0.000 description 18
- 230000000295 complement effect Effects 0.000 description 6
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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Abstract
The application relates to an audio broadcasting source device and an audio sharing method. The audio broadcasting source device comprises: at least two transmitting antennas located at different positions or having different attitudes. Also included is a broadcast-enabled wireless communication module configured to: and causing at least part of the at least two transmitting antennas to cooperatively perform repeated transmission of the set number of times of the audio data, such that repeated transmission of the set number of times of the same audio data is time-divisionally performed by different transmitting antennas. The high-quality music sharing function is realized, so that each destination terminal device can better receive the audio data from the source terminal device.
Description
Technical Field
The present application relates to a wireless audio broadcasting device, and more particularly, to an audio broadcasting source device and an audio sharing method.
Background
LE Audio enables a single Audio source device to broadcast one Audio stream to an unlimited number of bluetooth Audio sink devices by broadcasting Audio. Broadcast audio may join any range of audio receiving devices when on, and only allow the audio receiving device that entered the correct password to join when off. Therefore, the broadcast audio realizes the brand new Bluetooth use case, namely audio sharing.
Bluetooth audio sharing may be personal or location based. With personal audio sharing, users will be able to share their bluetooth audio experience with surrounding people, e.g., music on smartphones with family, friends. Bluetooth audio can be shared in public places such as airports, bars, gymnasiums, movie theatres, conference centers and the like by means of position-based audio sharing, so that the use experience of visitors is improved.
Fig. 1 shows a schematic diagram of an existing audio data transmission manner from a source device to a destination device. As shown in fig. 1, in this manner of transmitting audio data from a source device to a destination device, the source device 101 transmits audio data to a plurality of destination devices such as a first destination device 102a, a second destination device 102b, a j-th destination device 102j, and an m-th destination device 102 m. The destination devices are located at different positions, such as different gates at the same airport, and due to different distances from the source devices, there may be poor channels between one or more source devices and the destination devices, which results in the loss of the audio signals received by the destination devices. Or for the audio sharing based on the position, the environment interference of a plurality of destination terminal devices is large, such as public places like airports, bars, gymnasiums, movie theatres, conference centers and the like, because people flow is dense in the places, the interference of audio data transmission is large, and the places requiring the audio sharing coverage are large, the receiving of audio data signals of some destination terminal devices is influenced, and the audio use experience of the destination terminal devices is reduced.
To support Audio sharing, LE Audio introduced a synchronized Broadcast group (Broadcast IsochronousGroup, BIG) and a synchronized Broadcast stream (Broadcast Isochronous Stream, BIS). Such devices are of two types: a synchronized broadcast device (Isochronous Broadcaster) and a synchronized receiving device (SynchronizedReceiver), also referred to as a source device and a destination device.
A synchronized broadcast group is created by the source device that contains one or more synchronized broadcast streams. In order to conveniently and rapidly join the destination device in the synchronous broadcast group, the source device adopts a periodic advertisement event (periodic advertisingevent) to send synchronous broadcast group information (BIGInfo), and if the destination device cannot successfully and correctly receive the complete BIGInfo due to environmental interference, distance, blocking and other reasons, the destination device cannot join the synchronous broadcast group, and thus cannot receive subsequent audio data.
Disclosure of Invention
The present application has been made to solve the above-mentioned problems occurring in the prior art.
An audio broadcasting source device and an audio sharing method are needed, which can overcome the problem of larger interference in audio sharing, so that the coverage area of audio sharing is larger, the use experience of visitors is improved, and the audio broadcasting has better transmission performance. The method can solve the problem that the channel is poor for a long time or is always poor, and enable each destination terminal device to better receive audio data from the source terminal device, so that high-quality music sharing is achieved.
According to a first aspect of the present application, there is provided an audio broadcasting source device. The audio broadcasting source device comprises at least two transmitting antennas which are positioned at different positions or have different postures.
The audio broadcast source device further includes a broadcast-enabled wireless communication module configured to: and causing at least part of the at least two transmitting antennas to cooperatively perform repeated transmission of the set number of times of the audio data, such that repeated transmission of the set number of times of the same audio data is time-divisionally performed by different transmitting antennas.
According to a second aspect of the present application, an audio sharing method is provided. The audio sharing method is suitable for an audio broadcasting source device, the audio broadcasting source device comprises at least two transmitting antennas, the at least two transmitting antennas are located at different positions or have different postures, and the audio sharing method comprises the following steps: the audio broadcasting source device sets the repeated transmission times for different audio data.
The audio sharing method further comprises the step that the audio broadcasting source device cooperatively executes repeated transmission of the set times of the audio data by utilizing the at least two transmitting antennas, so that the repeated transmission of the set times of the same audio data is executed by different transmitting antennas in a time sharing mode.
By utilizing the audio broadcasting source device and the audio sharing method according to the embodiments of the application, the problem of larger interference in audio sharing can be overcome, the coverage area of audio sharing is larger, the use experience of visitors is improved, and the audio broadcasting has better transmission performance. The method can solve the problem that the channel is poor for a long time or is always poor, and enable each destination terminal device to better receive audio data from the source terminal device, so that high-quality music sharing is achieved.
Drawings
In the drawings, which are not necessarily drawn to scale, like numerals may describe similar components in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar components. The accompanying drawings illustrate various embodiments by way of example in general and not by way of limitation, and together with the description and claims serve to explain the disclosed embodiments. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive of the present apparatus or method.
Fig. 1 is a schematic diagram showing an existing audio data transmission manner from a source device to a destination device;
Fig. 2 is a schematic diagram showing an exemplary structure and operation principle of an audio broadcasting source device according to a first embodiment of the present application;
FIG. 3 illustrates an exemplary diagram of a source device sending audio data to a plurality of destination devices in accordance with an embodiment of the present application;
Fig. 4 is a schematic diagram showing an exemplary structure and operation principle of an audio broadcasting source device according to a second embodiment of the present application;
fig. 5 is a schematic diagram showing an exemplary structure and operation principle of an audio broadcasting source device according to a third embodiment of the present application;
fig. 6 shows an exemplary schematic diagram of an LE audio synchronized broadcast group;
fig. 7 shows an exemplary schematic diagram of a first type of synchronized broadcast group in accordance with an embodiment of the present application;
fig. 8 shows an exemplary schematic diagram of a second type of synchronized broadcast group according to an embodiment of the present application;
Fig. 9 shows an exemplary schematic diagram of a third synchronized broadcast group according to an embodiment of the present application;
FIG. 10 shows a flow chart of an audio sharing method according to an embodiment of the application; and
Fig. 11 shows a flowchart of an audio sharing method in the case of different numbers of transmit antennas according to an embodiment of the present application.
Detailed Description
The present application will be described in detail below with reference to the drawings and detailed description to enable those skilled in the art to better understand the technical scheme of the present application. Embodiments of the present application will be described in further detail below with reference to the drawings and specific examples, but not by way of limitation. The terms "first," "second," and "third" as used in this disclosure are merely intended to distinguish between corresponding features and do not necessarily represent such ordering, nor do they necessarily represent singular forms alone.
Fig. 2 is a schematic diagram showing an exemplary structure and operation principle of an audio broadcasting source device according to a first embodiment of the present application. As shown in fig. 2, the audio broadcasting source device includes at least two transmitting antennas, such as a first transmitting antenna 203a, a second transmitting antenna 203b, a third transmitting antenna 203c, and so on. Each transmit antenna is identified generally as 203 below when not distinguished. The number of the transmitting antennas 203 is 2 or more, or may be even 5, 10, or the like, and may be set according to the situation of the place of the audio broadcasting, the situation of the number of times of repeated transmission of the audio data, or the like.
By providing at least two transmitting antennas 203 located at different positions or having different attitudes for transmitting audio data, the ability of the destination device to receive audio data can be improved. The at least two transmitting antennas 203 may be located at different positions, so that the relative positions of the at least two transmitting antennas 203 and each destination device are different, whether each destination device has shielding is different, multipath reflection when each destination device receives the audio data sent by the at least two transmitting antennas is also different, and signal attenuation (coding) and radio frequency signal strength when each destination device receives the audio data sent by each antenna are also different.
If the transmitting antenna 203 has different attitudes, the signal attenuation and the strength of the radio frequency signal received by the destination device when transmitting the audio data with the destination device will also be different, and the reflection situation and the shielding situation of the destination device will also be different. For a certain destination device, at least two transmitting antennas 203 located at different positions or with different postures transmit signals, even if the transmitting condition (including the shielding condition, the reflecting condition, the attenuation condition and the like) of one transmitting antenna 203a is bad, the other transmitting antennas 203b and 203c can still keep good transmitting conditions, so that the capability of the destination device for receiving audio data can be improved.
In some embodiments, the position and/or pose of each transmit antenna 203 may be complementarily configured. For example, the transmission directions of the transmission antennas 203a, 203b, and 203c may be made orthogonal to each other. For example, the transmitting antenna 203a, the transmitting antenna 203b, and the transmitting antenna 203c may be made to be provided separately on different sides in the circumferential direction of the audio broadcasting source device. In this manner, each transmit antenna 203 can be made to complement assistance under varying transmit conditions to enhance and ensure the ability of the destination device to receive audio data under the various transmit conditions.
The audio broadcasting source device further includes a wireless communication module 202 supporting broadcasting, and the wireless communication module 202 performs repeated transmission of audio data using at least two transmitting antennas 203. The audio data may be the first audio data 201a or the second audio data 201b, etc. The same audio data refers to one audio data with the same content, and may be, for example, the first audio data 201a or the second audio data 201b. The wireless communication module 202 causes the at least two transmitting antennas 203 to cooperatively perform repeated transmission of the set number of times of audio data such that repeated transmission allocation of the same audio data of the set number of times is time-shared by different transmitting antennas 203. The same audio data is repeatedly transmitted n times, and if the number of transmitting antennas is m, the first transmitting antenna 203a performs the first repeated transmission 204a, the second transmitting antenna 203b performs the second repeated transmission 204b, and the third transmitting antenna 203c performs the third repeated transmission 204c, which is sequentially time-division performed. The first transmitting antenna 203a, the second transmitting antenna 203b and the third transmitting antenna 203c may be selected randomly from at least two transmitting antennas 203 or may be set in sequence, and different transmitting antennas 203 with a certain distance may be selected for transmitting, so that the problem that the source device is far away or has large interference can be better overcome.
The wireless communication module 202 performs time-sharing of repeated transmission allocation of the same audio data for a set number of times by different transmission antennas 203. It will be appreciated here that the repeated transmission of the same audio data is time-shared by different transmit antennas to complete all the repeated transmissions. For example, the wireless communication module 202 controls the time-sharing process of different transmitting antennas through a switch, specifically, the first time is transmitted by one transmitting antenna, the second time is controlled to be transmitted by the next transmitting antenna, and meanwhile, the last transmitting antenna is controlled to be turned off, so that the transmission is suspended.
In this embodiment, the wireless communication module 202 may be implemented by an SOC (system on a chip), and for example, various RISC (reduced instruction set computer) processors IP purchased from ARM company or the like may be utilized as processors of the SOC to perform corresponding functions. The antenna may be external to the chip.
The audio data according to the present application includes data for recording audio content, and the audio data may be transmitted by being carried in a data block. It will be appreciated that a data block is a transmission data unit, which may have different data block types, such as Payload Data Units (PDUs) in a bluetooth data transmission, etc.
Fig. 3 shows an exemplary schematic diagram of a source device sending audio data to a plurality of destination devices according to an embodiment of the present application. As shown in fig. 3, there are k (k > =1) destination end devices that respectively receive the same audio data transmitted by m (m > =2) transmitting antennas (i.e., the first transmitting antenna 301a, the second transmitting antenna 301b, … … mth transmitting antenna 301 m). Specifically, the first transmitting antenna 301a sends the same audio data to the first destination device 302a, the second destination device 302b, … … kth destination device 302k, respectively. The second transmitting antenna 301b transmits the same audio data to the first destination end device 302a, the second destination end device 302b, and the kth destination end device 302k, respectively. The mth transmitting antenna 301m transmits the same audio data to the first destination end device 302a, the second destination end device 302b, and the kth destination end device 302k, respectively. So that each destination device can receive the same audio data transmitted from a different antenna. If an audio broadcast is transmitted by a certain transmitting antenna, in a period of time (for example, 1ms or several ms or tens of ms), a channel condition between the source device and a certain destination device may be poor, and at this time, the destination device may not correctly receive any audio data from the source device out of n (n > =2) retransmission audio data, causing a clip of audio play, or noise in audio play. However, when m transmitting antennas are used for time-sharing and repeatedly transmitting the same PDU, as long as the channel condition between any transmitting antenna and the destination terminal device is good, the destination terminal device can more easily and correctly receive at least one audio data, thus greatly improving the capacity of the destination terminal device for receiving audio data and improving the capacity of the source terminal device for sharing music to each destination device.
Fig. 4 is a schematic diagram showing an exemplary structure and operation principle of an audio broadcasting source device according to a second embodiment of the present application. The number of setting times of repeated transmission of the audio data is smaller than the number of the at least two transmitting antennas, and each repeated transmission of the audio data is performed by a different transmitting antenna. As shown in fig. 4, the number of repeated transmissions n of the same audio data is smaller than the number of transmission antennas m. The audio data is input to the wireless communication module 402, and the audio data includes the same audio data content as the first audio data 401a, the second audio data 401b, and the like. The wireless communication module 402 performs time-sharing of repeated transmission allocation of the same audio data for a set number of times by different transmission antennas. The same audio data represents a single one of the first audio data 401a, the second audio data 401b, and the like. Specifically, the first transmission repetition 404a is performed by the first transmission antenna 403a, the second transmission repetition 404b is performed by the second transmission antenna 403b, the third transmission repetition 404c is performed by the third transmission antenna 403c, and the n-th transmission repetition 404n is performed by the n-th transmission antenna 403n, thereby completing n-th transmission repetition of the same audio data. Since the number of repeated transmissions n of the same audio data is smaller than the number m of transmission antennas, the wireless communication module 402 selects any n of the m transmission antennas to perform transmission of the same audio data or performs repeated transmission of the same audio data in accordance with the n transmission antennas that have been marked. Therefore, n transmitting antennas respectively perform repeated transmission of the same audio data, n transmitting antennas are respectively positioned at different positions or have different orientations or have different polarities, and the destination terminal equipment can correctly receive a certain repeated transmission of the same audio data, so that the reliability of audio broadcasting transmission is improved.
Fig. 5 is a schematic diagram showing an exemplary structure and operation principle of an audio broadcasting source device according to a third embodiment of the present application. The number of settings of the repeated transmission of the audio data is greater than the number of the at least two transmitting antennas such that each transmitting antenna is allocated to at least one repeated transmission of the audio data. As shown in fig. 5, the number n of repeated transmissions of the same audio data is greater than the number m of transmitting antennas. The audio data is input to the wireless communication module 502, and the audio data includes first audio data 501a, second audio data 501b, and the like. The wireless communication module 502 performs time-sharing of repeated transmission allocation of the same audio data for a set number of times by different transmission antennas. The same audio data represents the content of the same audio data contained in the first audio data 501a, the second audio data 501b, and the like.
The following illustrates the allocation, but it should be understood that the allocation is not limited thereto, and the group of transmitting antennas, i.e. the first transmitting antenna 503a, … … mth transmitting antenna 503m, is responsible for the corresponding part of the set retransmission times of the same audio data. When the individual transmit antennas are not distinguished, they are collectively identified as 503. The first m times of repeated transmission of the same audio data are completed by m transmitting antennas in one-to-one time sharing, with the first transmitting antenna 503a performing the first repeated transmission 504a and the mth transmitting antenna 503m performing the mth repeated transmission 504m, illustrated with the case of 2m > n > m. The first transmitting antenna 503a performs the (m+1) -th repeated transmission 504m+1, and the n-m transmitting antenna 503n-m performs the (n) -th repeated transmission 504n, after the same audio data is repeatedly transmitted. N repeated transmissions of the same audio data are completed so far, and in this example, n retransmissions are performed via m transmit antennas 503 in a sequential rotation manner, but the present application is not limited thereto. In practice, the latter n-m repeated transmissions may be transmitted by optional n-m of the m transmit antennas.
If n-m is still greater than m, time-sharing transmission is continued by using different m transmitting antennas until all repeated transmission times are completed finally. Each of the transmitting antennas 503 is allocated to at least one repetition transmission of the same audio data, that is, one or more repetition transmissions of the same audio data are performed. The destination device can only receive the same audio data for a certain repeated transmission, so that the reliability of audio broadcasting transmission is improved.
In some embodiments of the application, the wireless communication module comprises an LE audio module, and the audio data comprises audio data transmitted by LE audio broadcasting. LE audio supports audio sharing, which can be personal-based or location-based. The audio data of LE audio in the audio sharing may be repeatedly transmitted n times. For the audio data of LE audio, the receiving side does not feedback whether the audio data is received correctly, nor does the transmitting side know whether the receiving side receives correctly. The audio broadcasting source device in the application can improve the reliability of LE audio broadcasting transmission. The receiver only needs to correctly receive the LE audio data at a certain time.
Fig. 6 shows an exemplary schematic diagram of an LE audio synchronized broadcast group. As shown in fig. 6, LE Audio introduces a synchronized Broadcast group (Broadcast IsochronousGroup, BIG) and a synchronized Broadcast stream (Broadcast Isochronous Stream, BIS). A BIG Event 601 includes a BIG Event 602 and a control sub-Event 602b. Each BIS event 602 includes a plurality BISsubevent (sub-events) 602a. And the source terminal equipment of the LE Audio sends Audio data to a plurality of destination terminal equipment through BIG and BIS, so that Audio sharing is realized. BIS carries Payload Data Units (PDUs) provided for broadcast. The LE audio module is configured to enable the at least two transmitting antennas to cooperatively execute the retransmission time sequence of the PDU, and a receiver can complete the audio broadcasting process as long as any retransmission of the PDU is correctly received. The following three embodiments respectively show different examples with retransmission PDUs.
Fig. 7 shows an exemplary schematic diagram of a first type of synchronized broadcast group according to an embodiment of the present application. As shown in fig. 7, the BIS event 701 includes Payload Data Units (PDUs) P0, P1, P0, P1.BIS event 702 includes Payload Data Units (PDUs) P2, P3, P2, P3. It can be seen that the PDU is repeatedly transmitted 2 times in fig. 7. In fig. 7, a BIG event comprises a BIG event, and BIG event intervals are arranged between adjacent BIG events. The audio data transmitted by LE audio broadcasting is carried in Payload Data Units (PDUs). The LE audio module is configured such that at least portions of the at least two transmit antennas cooperatively perform retransmission timing of PDUs such that multiple retransmissions of the same PDU (e.g., P0) are time-shared by different transmit antennas.
Fig. 8 shows an exemplary schematic diagram of a second type of synchronized broadcast group according to an embodiment of the present application. As shown in fig. 8, one BIG in LE Audio contains one BIG, and the leftmost BIG data PDU contains P0, P2, P4. It can be seen that the PDU is repeatedly transmitted 5 times in fig. 8. Between adjacent BIG events in fig. 8 are BIG event intervals. The audio data transmitted by LE audio broadcasting is carried in Payload Data Units (PDUs). The LE audio module is configured such that at least portions of the at least two transmit antennas cooperatively perform retransmission timing of PDUs such that multiple retransmissions of the same PDU (e.g., P0) are time-shared by different transmit antennas.
Fig. 9 shows an exemplary schematic diagram of a third synchronized broadcast group according to an embodiment of the present application. As shown in fig. 9, one BIG of the LE Audio contains one BIG, and the leftmost BIG data PDU contains P0, P1, P8, and P9. It can be seen that the PDU is repeatedly transmitted 3 times in fig. 9. Between adjacent BIG events in fig. 9 are BIG event intervals. The audio data transmitted by LE audio broadcasting is carried in Payload Data Units (PDUs). The LE audio module is configured such that at least portions of the at least two transmit antennas cooperatively perform retransmission timing of PDUs such that multiple retransmissions of the same PDU (e.g., P0) are time-shared by different transmit antennas.
At least two transmit antennas follow the same retransmission timing or complementary retransmission timing of the PDU, wherein the same repetition timing refers to: the transmission timings of the different transmitting antennas are the same, and in a specific implementation process, different times of retransmission performed by the different transmitting antennas may be set, for example, the first repeated transmission is completed by the first transmitting antenna, the second repeated transmission is completed by the second transmitting antenna, and when the second repeated transmission is performed, the transmission power of the first transmitting antenna is set to be lower than a threshold value, which means that the first transmitting antenna does not have the second repeated transmission or the destination end does not receive the second repeated transmission after the first repeated transmission is sent. Wherein complementary retransmission timing refers to: the retransmission timings of different transmitting antennas are complementary, for example, the first transmitting antenna performs first repetition transmission and third repetition transmission, the second transmitting antenna performs second repetition transmission, each repetition transmission is performed by one of the at least two transmitting antennas, and finally, multiple retransmissions of the PDU can be completed.
In fig. 7, fig. 8, and fig. 9, different transmitting antennas are used to transmit different repeated PDUs in a time sharing manner, so that as long as the channel condition between any one transmitting antenna and the destination device is better, the destination device can more easily and correctly receive at least one LE audio data, thereby greatly improving the capability of the destination device for receiving audio data and improving the capability of the source device for sharing music to each destination device.
As can be seen from fig. 7, 8 and 9, the number of PDU retransmissions of LE audio is different in different synchronous broadcast groups, for example, according to P0, P2, P4 shown in fig. 8; p1, P3, P5; p2, P4, P6; p3, P5, P7; p4, P6, P8 to transmit PDUs of BIS. Meanwhile, PDUs for which BIS can be obtained are not completely sequentially transmitted. When multiple retransmissions of one PDU are performed by the same transmitting antenna, in such a case of incomplete sequential transmission, even when channels of the source device and the destination device are bad for a short time (e.g., time channels of 15 BIS are bad, the destination cannot correctly receive the audio broadcast frame), the destination may correctly receive one of the duplicate PDUs (e.g., P4), and thus, loss of the audio signal received by the destination device may not be caused, and thus, jamming or noise may not be caused when the destination device plays audio.
In case of repeated PDUs being transmitted in sequence, such as for 5 repetitions, such as according to P0, P0; p1, P1; p2, P2; … to transmit the PDUs of the BIS. In the synchronous broadcast group of LE audio, BIS parameters are configured such that pto=0, and PDUs are transmitted in order. When the channel between the source device and the destination device is poor for a short time, the destination device may not be able to correctly receive any one of the multiple retransmission PDUs, thereby causing loss of the audio signal. The at least two transmitting antennas of the audio broadcasting source device are positioned at different positions or different orientations, so that the at least two transmitting antennas have channels with correlation lower than a preset condition (the channels from the transmitting antennas to the destination equipment are mutually independent or have weak correlation), the repeated PDU is transmitted in sequence, and the audio broadcasting source device is executed by using the at least two transmitting antennas in a time sharing way for the same PDU. This can also overcome the situation that the channel between a certain source device and a destination device is worse for a short time, and even if the channel between a certain transmitting antenna and the destination device is worse for a long time or is always worse, the situation that the channel between other transmitting antennas and the destination device is better may be better. And the repeated PDU is transmitted in sequence, thereby reducing the broadcasting time delay and the size of the broadcasting transmission buffer.
In some embodiments of the present application, the audio broadcast source device further comprises an audio broadcast mirror source device. The audio broadcasting source device can be one or more sound boxes, headphones or the like. In addition to being used for the transmission of audio data, may also be used for playing audio.
In some embodiments of the application, the audio data comprises audio data processed in LC3/LC3+ encoding. The source device compresses audio data in LC3/LC3+ coding (encod) and then transmits the broadcast information in BIS to the destination device (e.g., wireless headphones, wireless speakers) as a broadcast source, which can receive the broadcast audio BIS and then decode and play the audio. The LC3/LC3+ coding scheme can provide higher sound quality at the same bit rate. In addition, the audio broadcasting source device can also support other coding modes, such as an SBC (coding mode), an AAC (advanced coding mode) coding mode and the like.
The following describes an audio sharing method of an audio broadcasting source device according to an embodiment of the present application.
Fig. 10 shows a flowchart of an audio sharing method according to an embodiment of the present application. As shown in fig. 10, the audio sharing method is suitable for an audio broadcasting source device, where the audio broadcasting source device includes at least two transmitting antennas, and the at least two transmitting antennas are located at different positions or have different attitudes. The audio sharing method starts in step S1001, and the audio broadcasting source device sets the number of repeated transmissions for different audio data respectively. For example, the audio data is repeatedly transmitted 4 times, 6 times, etc. by the audio broadcasting source device. In different times of broadcasting, the number of times of repeated transmission of the audio data may be the same or different in different cases.
In step S1002, the repeated transmission of the set number of times of the audio data is cooperatively performed by the audio broadcasting source device using the at least two transmitting antennas, so that the repeated transmission of the set number of times of the same audio data is time-divisionally performed by different transmitting antennas. The at least two transmitting antennas are respectively arranged at different positions, so that the relative positions of the at least two transmitting antennas and each destination terminal device are different, whether each destination terminal device has shielding is different, multipath reflection is different when each destination terminal device receives the audio data sent by the at least two transmitting antennas, and signal attenuation (fading) and radio frequency signal strength are also different when each destination terminal device receives the audio data sent by each antenna.
If the transmitting antenna has a different pose, the signal attenuation and the strength of the radio frequency signal may also be different when transmitting audio data with the destination device. For a certain destination device, at least two transmitting antennas located at different positions or with different postures transmit signals, even if the transmitting condition (including the shielding condition, the reflecting condition and the attenuation condition) of one transmitting antenna is poor, other transmitting antennas can still keep good transmitting conditions, so that the capability of receiving audio data of the destination device can be improved.
In some embodiments, the positions and/or attitudes of the respective transmit antennas may be complementarily configured. For example, the transmission directions of different transmission antennas may be made orthogonal to each other. For example, different transmitting antennas may be made to be separately provided on different sides in the circumferential direction of the audio broadcasting source device. In this way, each transmitting antenna can complementarily assist under variable transmitting conditions, so as to improve and ensure the capability of the destination terminal equipment to receive the audio data under various transmitting conditions.
The audio broadcasting source device cooperatively performs repeated transmission of the set times of the audio data by using the at least two transmitting antennas, so that the repeated transmission of the set times of the same audio data is performed by different transmitting antennas in a time sharing manner. Different transmitting antennas transmit the same audio data in a time sharing manner to complete all repeated transmission of the same audio data. As long as the channel condition between any one transmitting antenna and the destination terminal equipment is good, the destination terminal equipment can more easily and correctly receive at least one audio data, so that the capacity of the destination terminal equipment for receiving the audio data is greatly improved, and the capacity of the source terminal equipment for sharing music to all the destination equipment is improved. In summary, it can be seen that the audio data transmission mode of the audio broadcasting source device of the present application is different from the existing audio data transmission mode.
Fig. 11 shows a flowchart of an audio sharing method in the case of different numbers of transmit antennas according to an embodiment of the present application. As shown in fig. 11, beginning at step S1101, different audio data are respectively set up by the audio broadcasting source device for the number of times of repeated transmission. For example, the audio data is repeatedly transmitted 4 times, 6 times, etc. by the audio broadcasting source device. The number of repeated transmissions may be the same or different for different audio data under different circumstances.
Next, in two cases, step S1102a and step S1102b, where n < m corresponds to step S1102a, and the number of setting times of repeated transmission of audio data is greater than the number of at least two transmitting antennas, so that each transmitting antenna is allocated to at least one repeated transmission of the audio data. The number of repeated transmissions n of the same audio data is smaller than the number of transmitting antennas m. The number of setting times of repeated transmission of the audio data is smaller than the number of the at least two transmitting antennas, and each repeated transmission of the audio data is performed by a different transmitting antenna. Specifically, the same time-division transmission of the audio data is time-division performed by n transmit antennas among the m transmit antennas. The n transmitting antennas are optionally arranged in the m transmitting antennas, or the same audio data is repeatedly sent according to the marked n transmitting antennas, for example, certain transmitting antennas with a certain interval can be selected to be sent in the places such as airports, gymnasiums and the like. Therefore, n transmitting antennas respectively perform repeated transmission of the same audio data, n transmitting antennas are respectively positioned at different positions, and the destination device can correctly receive a certain repeated transmission of the same audio data, so that the reliability of audio broadcasting transmission is improved.
N > m corresponds to step S1102b, where the number of settings for repeated transmission of audio data is smaller than the number of at least two transmit antennas, each repeated transmission of audio data being performed by a different transmit antenna. As shown in fig. 5, the number n of repeated transmissions of the same audio data is greater than the number m of transmitting antennas. The number of settings of the repeated transmission of the audio data is greater than the number of the at least two transmitting antennas such that each transmitting antenna is allocated to at least one repeated transmission of the audio data. Specifically, the first m times of repeated transmission of the same audio data are completed by m transmitting antennas in a time-sharing manner. And repeating the transmission of the same audio data for the last n-m times, and then performing transmission by optional n-m transmitting antennas in m transmitting antennas or performing transmission according to the set n-m transmitting antennas. If n-m is still greater than m, time-sharing transmission is continued by using different m transmitting antennas until all repeated transmission times are completed finally. One or more of the antennas performs one or more repeated transmissions of the same audio data. The destination device can only receive the same audio data for a certain repeated transmission, so that the reliability of audio broadcasting transmission is improved.
In some embodiments of the application, the audio data comprises audio data transmitted by LE audio broadcasting. The audio broadcasting source device can improve the reliability of LE audio broadcasting transmission. The receiver only needs to correctly receive the LE audio data at a certain time.
In some embodiments of the present application, the audio data includes a Payload Data Unit (PDU) in which the audio data transmitted by the LE audio broadcast is carried in BIS, and the at least two transmit antennas cooperatively perform a retransmission timing of the PDU. In order to support audio sharing, LE audio synchronized broadcast groups (BIG) are proposed, which contain BIS that carries Payload Data Units (PDUs) provided for the broadcast. At least two transmit antennas cooperatively perform retransmission timing of the PDU.
In some embodiments of the application, at least two transmit antennas follow the same retransmission timing or complementary retransmission timing of a PDU, so that multiple retransmissions of the same PDU are time-shared by different transmit antennas. Multiple retransmissions of a PDU can eventually be completed with the same retransmission timing or complementary retransmission timing. The method is beneficial to reducing the loss of the audio signal received by the destination terminal equipment, so that the destination terminal equipment cannot cause jamming or noise when playing the audio.
In some embodiments of the present application, the audio sharing method further includes: the at least two transmit antennas sequentially perform retransmission timing of the PDUs. For example, according to P0, P0, P0, P0, P0; p1, P1; p2, P2; … to transmit the PDUs of the BIS. In the synchronous broadcast group of LE audio, BIS parameters may be configured such that pto=0. The at least two transmitting antennas of the audio broadcasting source device are positioned at different positions or have different postures or directivities, so that channels between the at least two transmitting antennas and the destination receiving antenna have lower correlation, and for the same PDU, the audio broadcasting source device is carried out by utilizing the at least two transmitting antennas in a time sharing way. This can also overcome the situation that the channel between a certain source device and a destination device is worse for a short time, and even if the channel between a certain transmitting antenna and the destination device is worse for a long time or is always worse, the situation that the channel between other transmitting antennas and the destination device is better may be better. Meanwhile, the at least two transmitting antennas sequentially perform retransmission timing of the PDU, so that broadcasting delay can be reduced and the size of a broadcasting transmission buffer can be reduced.
In some embodiments of the application, the audio data comprises audio data processed in LC3/LC3+ encoding. The source device compresses audio data in LC3/LC3+ coding (encod) and then transmits the broadcast information in BIS to the destination device (e.g., wireless headphones, wireless speakers) as a broadcast source, which can receive the broadcast audio BIS and then decode and play the audio. The LC3/LC3+ coding scheme can provide higher sound quality at the same bit rate. In addition, the audio broadcasting source device can also support other coding modes, such as an SBC coding mode and the like.
The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this application will occur to those skilled in the art, and are intended to be within the spirit and scope of the application.
Claims (6)
1. An audio broadcasting source device, comprising:
at least two transmitting antennas located at different positions or having different attitudes;
A wireless communication module supporting broadcasting, the wireless communication module including an LE audio module, the audio data including audio data transmitted by LE audio broadcasting, the audio data transmitted by LE audio broadcasting being carried in Payload Data Units (PDUs) in BIS, the LE audio module being configured to cause the at least two transmit antennas to cooperatively perform retransmission timing of the PDUs such that the at least two transmit antennas follow the same retransmission timing of the PDUs, but multiple retransmissions of the same PDU are time-division performed by different transmit antennas by controlling switching or transmission power of the antennas, wherein:
in case that the set number of repeated transmission of the PDU is greater than the number of the at least two transmitting antennas, causing each transmitting antenna to be allocated to at least one repeated transmission of the audio data;
In the case that the set number of repeated transmission of the PDU is smaller than the number of the at least two transmitting antennas, each repeated transmission of the audio data is performed by a different transmitting antenna; and
And when the corresponding transmitting antenna is not allocated to perform the repeated transmission of the PDU, the transmitting antenna is turned off or the transmitting power is lower than a threshold value, so that the destination terminal cannot receive the PDU.
2. The audio broadcasting source device as defined in claim 1, wherein the LE audio module is further configured to cause the at least two transmit antennas to sequentially perform retransmission timing of PDUs.
3. The audio broadcasting source device of claim 1, wherein the audio data comprises audio data processed in an LC3/LC3+ encoding manner.
4. An audio sharing method is suitable for an audio broadcasting source device, the audio broadcasting source device comprises at least two transmitting antennas, the at least two transmitting antennas are positioned at different positions or have different postures, and the audio sharing method is characterized in that,
The audio broadcasting source device sets the repeated sending times for different audio data respectively;
The audio data includes audio data transmitted by LE audio broadcasting, the audio data includes a Payload Data Unit (PDU) of the audio data transmitted by LE audio broadcasting carried in BIS, retransmission timing of the PDU is cooperatively performed by an audio broadcasting source device using the at least two transmitting antennas such that the at least two transmitting antennas follow the same retransmission timing of the PDU, but multiple retransmissions of the same PDU are time-division performed by different transmitting antennas by controlling switching or transmitting power of the antennas, wherein:
in case that the set number of repeated transmission of the PDU is greater than the number of the at least two transmitting antennas, causing each transmitting antenna to be allocated to at least one repeated transmission of the audio data;
In the case that the set number of repeated transmission of the PDU is smaller than the number of the at least two transmitting antennas, each repeated transmission of the audio data is performed by a different transmitting antenna; and
And when the corresponding transmitting antenna is not allocated to perform the repeated transmission of the PDU, the transmitting antenna is turned off or the transmitting power is lower than a threshold value, so that the destination terminal cannot receive the PDU.
5. The audio sharing method of claim 4, further comprising: the at least two transmit antennas sequentially perform retransmission timing of the PDUs.
6. The audio sharing method of claim 4, wherein the audio data comprises audio data processed in LC3/LC3+ encoding mode.
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