WO2022068221A1 - 低延迟无线音频发送和接收方法及设备 - Google Patents

低延迟无线音频发送和接收方法及设备 Download PDF

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Publication number
WO2022068221A1
WO2022068221A1 PCT/CN2021/095018 CN2021095018W WO2022068221A1 WO 2022068221 A1 WO2022068221 A1 WO 2022068221A1 CN 2021095018 W CN2021095018 W CN 2021095018W WO 2022068221 A1 WO2022068221 A1 WO 2022068221A1
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audio
connection
low
physical layer
receiving device
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PCT/CN2021/095018
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English (en)
French (fr)
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徐斌
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南京中感微电子有限公司
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Publication of WO2022068221A1 publication Critical patent/WO2022068221A1/zh
Priority to US18/127,504 priority Critical patent/US20230276515A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1041—Mechanical or electronic switches, or control elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/06—Transport layer protocols, e.g. TCP [Transport Control Protocol] over wireless
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of wireless communication, and more particularly, to a wireless audio transmission and reception method and device that can provide a low-latency audio transmission service.
  • Wireless audio technology brings people unfettered free calls or music enjoyment, and is widely loved by people.
  • BLE Bluetooth Low Energy
  • Audio Audio
  • CIS Connected Isochronous Stream
  • LC3 Low Complexity Communication Codec
  • the CIS protocol specifies that a CIS event occurs within an equal time interval, and each CIS event consists of one or more sub-events.
  • the transmitter transmits data in each CIS sub-event, and the receiver receives data in each CIS sub-event and responds with an acknowledgment.
  • the low-power Bluetooth physical layer (Physical Layer, referred to as PHY), which is responsible for sending and receiving data packets from the physical channel, has a relatively low transmission rate, even in the latest version.
  • PHY Physical Layer
  • the maximum data transfer rate of the physical layer is usually only 1Mbps or 2Mbps, so it is difficult to provide wireless audio services with ultra-low latency and no compression loss, especially games that require very high latency and audio quality.
  • the needs of headset players are limited by their complex data transmission mechanisms and cannot meet the requirements of ultra-low latency and high performance.
  • the invention discloses a wireless audio transmission and reception method, and a corresponding transmission/reception device, which can provide a low-delay audio transmission service.
  • a wireless audio transmission method is provided. That is, the method includes:
  • the audio sending device establishes a high-speed physical layer-based connection isochronous stream connection with the audio receiving device; the minimum data transmission rate of the high-speed physical layer is higher than the maximum data transmission rate of the low-power bluetooth physical layer;
  • the audio sending device sends the first audio data to the audio receiving device through the high-speed physical layer-based connection isochronous stream connection.
  • the audio sending device establishes a high-speed physical layer-based connection isochronous stream connection with the audio receiving device, including:
  • the audio sending device establishes a low-power Bluetooth asynchronous connection with the audio receiving device based on the low-power bluetooth physical layer, and the audio sending device is connected to the audio receiving device through the low-power Bluetooth asynchronous connection.
  • the device establishes an isochronous stream connection based on the high-speed physical layer connection.
  • the method further includes: confirming whether the audio receiving device supports ultra-low-latency wireless audio transmission through the asynchronous connection of the low-power bluetooth by the audio sending device;
  • the audio sending device establishes an isochronous streaming connection based on the low energy bluetooth physical layer with the audio receiving device through the low energy bluetooth asynchronous connection, and through the low energy bluetooth physical layer Connecting an isochronous streaming connection using bluetooth, and sending the second audio data to the audio receiving device; or, the audio sending device sending the second audio data to the audio receiving device through the low-power bluetooth asynchronous connection;
  • the audio sending device establishes a connection isochronous stream connection based on the high-speed physical layer with the audio receiving device through the Bluetooth low energy asynchronous connection.
  • the confirmation of whether the audio receiving device supports ultra-low-latency wireless audio transmission includes,
  • the second audio data includes encoded Bluetooth low energy audio data; the first audio data includes audio data without compression loss or audio data without encoding.
  • the data transmission rate of the high-speed physical layer is not lower than 4Mbps.
  • the high-speed physical layer includes any one of a wireless local area network physical layer, a wireless ultra-wideband physical layer, or a predetermined broadband physical layer.
  • the high-speed physical layer includes an IEEE802.11n wireless local area network physical layer.
  • the configuration of the high-speed physical layer-based connection isochronous stream connection is to use a 20MHz bandwidth, use an isochronous interval of 1.25ms or 2.5ms, and set the time interval between the audio data packet and the acknowledgment packet to be a short inter-frame interval. , set the minimum sub-event distance equal to the short inter-frame interval;
  • the wireless audio transmission method further includes,
  • the audio sending device sends uncoded stereo audio with a sampling rate of 48kHz and a quantization number of 16 bits, and the isochronous interval is 2.5ms; the audio data packet size sent is 480 bytes, using 2.4GHz ISM frequency band and 20MHz bandwidth IEEE802.
  • the modulation coding set of the 11n physical layer, the modulation coding set index value is 4, the transmission rate is 39Mbps, the HT_GF format, the BCC_CODING coding method, the LONG_GI guard interval, and the time length of the audio data packet are 136us;
  • the confirmation packet with the modulation code set index value of 1 is adopted, and the time length of the confirmation unit is 40us;
  • the minimum sub-event distance and short inter-frame interval are 10us, the number of sub-events is 3, the maximum transmission delay is 588us, the audio processing delay is 412us, and the minimum delay from interception to playback of audio samples is 3.5ms.
  • the wireless frequency band in which the high-speed physical layer works is divided into N non-overlapping channels with predetermined bandwidths, and based on a predetermined automatic frequency hopping rule, the two adjacent sub-events within an equal time interval are sent signals that are equal to each other.
  • Different channel numbers are used; the N is a positive integer greater than 1.
  • the configuration of the isochronous flow connection based on the connection of the high-speed physical layer is to use a 2.4GHz ISM frequency band and a 20MHz bandwidth, and divide the 2.4GHz ISM frequency band into N non-overlapping 20MHz bandwidth channels.
  • the channel numbers are 0 to N-1, and N is 2 or 3;
  • the predetermined automatic frequency hopping rule includes: in each isochronous interval, the channel number used for the first sub-event E1 transmission is the remainder of dividing the sequence number of the connection isochronous flow event by N; The channel number used for sending the sub-event Ex after the event E1 is, the channel number used for sending E1 is added to the sequence number of the sub-event Ex, and then divided by the remainder of N.
  • the method also includes,
  • the audio transmitting device and the audio receiving device according to the channel mapping table of the adaptive frequency hopping of the Bluetooth low energy asynchronous connection, select the channel of the predetermined bandwidth that covers the most useful channels as the channel of the high-speed physical layer ;as well as,
  • the channel of the high-speed physical layer is updated through a Bluetooth low energy asynchronous connection.
  • a wireless audio receiving method wherein the receiving is that an audio receiving device receives from an audio transmitting device, and the method is performed by the audio receiving device, and is characterized in that, comprising:
  • the audio receiving device establishes an isochronous stream connection based on a high-speed physical layer with the audio sending device; the minimum data transmission rate of the high-speed physical layer is higher than the maximum data transmission rate of the low-power bluetooth physical layer;
  • the audio receiving device receives the first audio data from the audio transmitting device through the high-speed physical layer-based connection isochronous stream connection.
  • the audio receiving device establishes a high-speed physical layer-based connection isochronous stream connection with the audio sending device, including,
  • the audio receiving device establishes a low-power Bluetooth asynchronous connection with the audio sending device based on the low-power bluetooth physical layer; the audio receiving device is connected with the audio sending device through the low-power Bluetooth asynchronous connection.
  • An isochronous stream connection is established based on the high-speed physical layer connection.
  • the audio receiving device provides confirmation information of whether the audio receiving device supports ultra-low-latency wireless audio transmission to the audio transmitting device through the low-power Bluetooth asynchronous connection;
  • the audio receiving device establishes an isochronous streaming connection based on the Bluetooth low energy physical layer Bluetooth low energy connection with the transmitting audio device through the Bluetooth low energy asynchronous connection.
  • An isochronous streaming connection via a Bluetooth power consumption connection to receive the second audio data from the audio sending device; or, the audio receiving device receiving the second audio data from the audio sending device through the low-power Bluetooth asynchronous connection;
  • the audio receiving device establishes an isochronous streaming connection based on the high-speed physical layer connection with the audio transmitting device through the Bluetooth low energy asynchronous connection.
  • the audio receiving device provides confirmation information of whether the audio receiving device supports ultra-low-latency wireless audio transmission to the audio sending device through its general attribute configuration service;
  • the second audio data includes encoded low-power Bluetooth audio data
  • the first audio data includes audio data without compression loss or audio data without encoding
  • the data transmission rate of the high-speed physical layer is not lower than 4Mbps.
  • a third aspect provides a wireless audio transmission device, characterized in that the transmission device implements the method described in the first aspect, and includes a baseband data and protocol processor and a broadband radio frequency transceiver module, wherein:
  • the baseband data and protocol processor is configured to drive the broadband radio frequency transceiver module and the wireless audio receiving device to establish a high-speed physical layer-based connection isochronous flow connection, and through the connection isochronous flow connection, to the wireless audio receiving device. Send the first audio data.
  • the device further includes a low-power Bluetooth radio frequency transceiver module;
  • the baseband data and protocol processor is configured to drive the low-power bluetooth radio frequency transceiver module to establish a low-power bluetooth asynchronous connection based on the low-power bluetooth physical layer with the wireless audio receiving device;
  • the baseband data and the protocol processor are asynchronously connected through the low-power bluetooth, so that the broadband radio frequency transceiver module and the wireless audio receiving device establish a high-speed physical layer-based connection isochronous stream connection.
  • the baseband data and protocol processor is further configured to confirm whether the wireless audio receiving device supports ultra-low-latency wireless audio transmission through the low-power Bluetooth asynchronous connection;
  • the baseband data and protocol processor is further configured to connect the low-power bluetooth asynchronously to enable the low-power bluetooth radio frequency transceiver module to communicate with the The wireless audio receiving device establishes a connection isochronous stream connection based on the Bluetooth low energy physical layer, and sends second audio data to the wireless audio receiving device through the connection isochronous stream connection; or the baseband data and protocol processor is configured to Send the second audio data to the wireless audio receiving device through the low-power Bluetooth asynchronous connection;
  • the baseband data and protocol processor drives the broadband radio frequency transceiver module, and sends the wireless audio receiving device to the wireless audio receiving device through the isochronous stream connection based on the high-speed physical layer connection.
  • the first audio data is sent.
  • a third aspect provides a wireless audio receiving device, wherein the receiving device implements the method described in the second aspect, and includes a baseband data and protocol processor and a broadband radio frequency transceiver module, wherein:
  • the baseband data and protocol processor is configured to drive the wideband radio frequency transceiver module to establish a high-speed physical layer-based connection isochronous flow connection with the wireless audio transmission device, and receive audio from the wireless audio through the isochronous flow connection of the connection. Send the first audio data of the device.
  • the device further includes a low-power Bluetooth radio frequency transceiver module;
  • the baseband data and protocol processor is configured to drive the low-power bluetooth radio frequency transceiver module to establish a low-power bluetooth asynchronous connection based on the low-power bluetooth physical layer with the wireless audio transmission device;
  • the low-power bluetooth radio frequency transceiver module receives the second audio data from the wireless audio transmission device through the low-power bluetooth asynchronous connection;
  • the bluetooth-consuming radio frequency transceiver module establishes a high-speed physical layer-based connection isochronous flow connection with the wireless audio transmission device through the low-power bluetooth asynchronous connection, and through the high-speed physical layer-based connection Isochronous streaming connection, receiving the first audio data from the wireless audio transmission device; or the low-power Bluetooth radio frequency transceiver module establishes a low-power Bluetooth physical based connection with the wireless audio transmission device through the low-power Bluetooth asynchronous connection
  • the connection of the layer is an isochronous streaming connection, and through the connection isochronous streaming connection, the second audio data from the wireless audio transmission device is received.
  • the baseband data and protocol processor is configured to set whether the device supports ultra-low-latency wireless audio services through general attribute configuration, and to provide general wireless audio sending devices through the low-power Bluetooth asynchronous connection. Property configuration service query.
  • a wireless audio sending and receiving method and a corresponding sending/receiving device provided by an embodiment of the present invention, between the wireless audio sending device and the receiving device, based on the data transmission rate higher than the transmission rate of the low-power bluetooth physical layer
  • the high-speed physical layer of the connection establishes a connection isochronous streaming connection, thereby providing a low-latency wireless audio transmission service.
  • FIG. 1 is a flowchart of a wireless audio transmission method according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a wireless audio transmission scenario provided by an embodiment of the present invention.
  • FIG. 3 is a structural diagram of a specific implementation manner of a wireless audio sending device provided by an embodiment of the present invention.
  • FIG. 4 is a structural diagram of a specific implementation manner of a wireless audio receiving device according to an embodiment of the present invention.
  • FIG. 5 is a structural diagram of a time slot structure of an isochronous stream link using a high-speed physical layer connection provided by an embodiment of the present invention
  • BLE Bluetooth Low Energy
  • Audio audio
  • CIS Connection Isochronous Stream
  • LC3 Low Complexity Communication Codec
  • BLE Audio still has performance problems. The reason is that BLE Audio has a low transmission rate and must rely on high-compression audio coding technology, so it is difficult to provide ultra-low latency and no compression loss. Wireless audio service, especially for gaming headset gamers who have very high latency and audio quality requirements.
  • an embodiment of the present invention proposes a wireless audio transmission and reception method that can realize ultra-low delay transmission.
  • the audio sending device and the audio receiving device establish an isochronous stream connection based on a high-speed physical layer; the minimum data transmission rate of the high-speed physical layer is higher than the maximum data transmission rate of the low-power bluetooth physical layer;
  • the high-speed physical layer-based connection isochronous flow CIS connection (also referred to as a CIS link in the following embodiments) is used to send the first audio data to the audio receiving device.
  • the maximum data transmission rate of IEEE802.11a of wireless local area network can reach 54Mbps
  • the maximum data transmission rate of IEEE802.11b can reach 11Mbps
  • the wireless ultra-wideband UWB can reach several Ten megabits per second to hundreds of megabits per second, much higher than Bluetooth, but also higher than IEEE 802.11n.
  • the audio data is transmitted by the connection isochronous stream (CIS) connection established based on the high-speed physical layer. In an isochronous interval of the CIS connection, the audio data can be sent, retransmitted and confirmed for a limited number of times. Layers of audio data transfer efficiency and reduce latency.
  • data packets can be sent and received from the physical channel using a high-speed physical layer with a data transmission rate not lower than 4 Mbps.
  • ISO_Interval isochronous interval
  • Sub_Interval sub-event interval
  • T_MSS Minimum Sub-event Space
  • the audio sending device may further establish an Asynchronous Connection-oriented Link (ACL: Asynchronous Connection-oriented Link) with the audio receiving device based on the BLE physical layer (the following embodiments It can also be called an ACL link in the BLE ACL, and negotiate the parameters required to establish a CIS connection through the BLE ACL connection, thereby assisting in the establishment of an isochronous flow connection based on a high-speed physical layer.
  • ACL Asynchronous Connection-oriented Link
  • FIG. 2 shows a schematic diagram of an ultra-low-latency wireless audio transmission scenario provided by an embodiment of the present invention.
  • the devices constituting the ultra-low-latency wireless audio system in this scenario include audio source devices, audio sending devices, and audio receiving and playback devices.
  • the audio source device may include a TV, a computer, a smart phone, etc., as well as an audio storage device.
  • the audio sending device and the audio source device are connected by wire or wirelessly, and the audio receiving and playing device are wirelessly connected with the audio sending device.
  • the wired connection may be an audio cable, a USB interface, an I2S interface, or a high-speed SPI.
  • the wireless connection may be a wireless connection implemented based on a standard such as a Bluetooth communication protocol, a wireless local area network communication protocol, or a dedicated wireless communication protocol.
  • This scenario can specifically include BLE asynchronous connection connection and BLE CIS connection using Bluetooth Low Energy (BLE) physical layer (PHY), and CIS connection using high-speed PHY.
  • the high-rate PHY may specifically use a wireless local area network PHY, a wireless ultra-wideband PHY, or other custom PHYs whose minimum data transmission rate is higher than the BLE PHY's maximum data transmission rate.
  • the high-rate PHY used is an IEEE802.11n wireless local area network PHY.
  • FIG. 1 shows a flowchart of a wireless audio transmission method provided by an embodiment of the present invention. Described sending is to send from audio frequency transmission equipment to audio frequency receiving equipment, and this method is performed by described audio frequency transmission equipment, as shown in Figure 1, this method at least comprises the following steps:
  • Step 11 The audio sending device establishes an isochronous stream connection with the audio receiving device based on the high-speed physical layer; the minimum data transmission rate of the high-speed physical layer is higher than the maximum data transmission rate of the Bluetooth low energy physical layer.
  • the high-speed physical layer may be one of a wireless local area network physical layer, a wireless ultra-wideband physical layer, or other predetermined broadband physical layers, but the minimum data transmission rate of the adopted physical layer should be higher than Maximum data transfer rate for the Bluetooth Low Energy physical layer.
  • the data transmission rate of the high-speed physical layer is not lower than 4 Mbps, and 4 Mbps is confirmed according to the minimum rate requirement for transmitting lossless high-fidelity audio.
  • the audio sending device can establish an asynchronous connection with the audio receiving device based on the Bluetooth low energy physical layer, and the audio sending device is connected asynchronously through the Bluetooth low energy, An isochronous streaming connection based on the high-speed physical layer connection is established with the audio receiving device.
  • the audio transmitting device can also use low power consumption. Bluetooth asynchronous connection, confirm whether the audio receiving device supports ultra-low latency wireless audio transmission;
  • the audio sending device establishes an isochronous streaming connection based on the low-power Bluetooth physical layer with the audio receiving device through an asynchronous connection of low-power Bluetooth. connect, and send the second audio data to the audio receiving device; or, the audio sending device sends the second audio data to the audio receiving device through a low-power Bluetooth asynchronous connection;
  • the audio sending device establishes a high-speed physical layer-based connection isochronous streaming connection with the audio receiving device through a low-power Bluetooth asynchronous connection.
  • the service may be configured by accessing the general properties of the audio sink device to confirm whether the audio sink device supports ultra-low latency wireless audio transmission.
  • the general attribute configuration service (Generic Attribute Profile, GATT) has the function of querying the services that can be implemented by itself. Devices that support ultra-low-latency wireless audio transmission can have eigenvalues or services that characterize the capability.
  • the sending device can query the receiving device by querying the receiving device. GATT, knowing the capabilities of the receiving device. In different examples, it is also possible to confirm whether the device supports ultra-low-latency wireless audio transmission through other methods instead of GATT.
  • the second audio data may be encoded Bluetooth low energy audio data.
  • the high-speed physical layer may be an IEEE 802.11n wireless local area network physical layer.
  • the configuration of the high-speed physical layer-based connection isochronous stream connection can also be configured to use 20MHz bandwidth, support isochronous intervals of 1.25ms and 2.5ms, and the time interval between the audio data packet and the acknowledgment packet.
  • Set to short interframe space SIFS, Short Interframe Space
  • T_MSS Minimum Sub-event Space
  • SIFS the time interval between two consecutive packets is called the frame interval (IFS).
  • SIFS is the shortest frame interval and is usually used to separate packets that require an immediate response.
  • FIG. 5 shows a structural diagram of a time slot structure of a connection isochronous stream link using a high-speed physical layer according to an embodiment of the present invention.
  • the master device within the isochronous interval (ISO_Interval), the master device (Master) can send audio data (Data) multiple times until it correctly receives the acknowledgment information (ACK) replied by the slave device (Slave) or reaches the maximum transmission. Number of times or sub-events.
  • CIS adopts smaller ISO_Interval, smaller sub-event interval (Sub_Interval), shorter minimum sub-event distance (T_MSS: Minimum Sub-event Space), and smaller data packets ( Data) and the time interval between the acknowledgment packet (ACK), so that the transmission efficiency can be improved.
  • a high-speed physical layer with a bandwidth of 20MHz can be used, such as IEEE802.11n PHY, ISO_Interval of 1.25ms and 2.5ms is set, and the interval between Data and ACK is equal to SIFS (Short Interframe Space) , T_MSS is equal to SIFS.
  • SIFS Short Interframe Space
  • Step 12 the audio sending device sends the first audio data to the audio receiving device through the high-speed physical layer-based connection isochronous stream connection.
  • the first audio data may be lossless audio data or unencoded audio data.
  • the configuration of the high-speed physical layer-based connection isochronous flow connection is to use a 20MHz bandwidth, use an isochronous interval of 1.25ms or 2.5ms, and set the time interval between the audio data packet and the acknowledgment packet to be a short frame Interval, setting the minimum sub-event distance equal to the short inter-frame interval;
  • the wireless audio transmission method further includes that the audio transmission device transmits uncoded stereo audio with a sampling rate of 48 kHz and a quantization number of 16 bits, and the isochronous interval is 2.5 ms; the size of the transmitted audio data packet is 480 bytes , using 2.4GHz ISM frequency band, 20MHz bandwidth IEEE802.11n physical layer modulation coding set, modulation coding set index value 4, transmission rate 39Mbps, using HT_GF format, BCC_CODING coding method, LONG_GI guard interval, time length of audio data packets It is 136us; the acknowledgment packet with the modulation code set index value of 1 is adopted, and the time length of the confirmation unit is 40us; the minimum sub-event distance and short inter-frame interval are 10us, the number of sub-events is 3, the maximum transmission delay is 588us, and the audio processing delay is 412us, the minimum delay of audio sampling from interception to playback is 3.5ms.
  • the wireless audio transmission method provided by the embodiment of the present invention adopts a high-speed physical layer, especially when the wireless office and the network physical layer are the biggest challenge is WIFI interference. Since a typical WIFI packet is long, and the data packet in the embodiment of the present invention is short, the WIFI signal may occupy the channel for a relatively long time, thereby interfering with the audio transmission according to the method of the present invention. To this end, the embodiment of the present invention provides two methods for resisting WIFI interference, one is automatic frequency hopping, and the other is dynamic frequency configuration.
  • the wireless frequency band in which the high-speed physical layer works can be divided into N non-overlapping channels of predetermined bandwidths, and based on a predetermined automatic frequency hopping rule, two adjacent sub-events within an equal time interval are made Channel numbers used for transmitting signals are different; the N is a positive integer greater than 1.
  • the high-speed physical layer-based connection can be configured as an isochronous stream connection, using a 2.4GHz ISM frequency band and a 20MHz bandwidth, and dividing the 2.4GHz ISM frequency band into N non-overlapping channels with a 20MHz bandwidth , set its channel numbers to be 0 to N-1, where N is 2 or 3;
  • the predetermined automatic frequency hopping rules include: in each isochronous interval, the channel number used for the first transmission of the sub-event E1 is the serial number of the connection isochronous flow event (the effect of the serial number is for each CIS event sequence count) is divided by the remainder of N; the channel number used for sending the sub-event Ex after the first sub-event E1 is, the channel number used for sending E1 and the sequence number of the sub-event Ex are added and then divided by N remainder of . It can be understood that the above-mentioned mathematical method for calculating the remainder is only a scheme for determining the frequency hopping channel, and in different embodiments, different specific implementation manners may also be adopted.
  • the automatic frequency hopping method even divides the 2.4GHz frequency band into three non-overlapping 20MHz bandwidth channels, numbered 0, 1, and 2.
  • the channel number used for the first transmission in each ISO Interval is the sequence number of the current CIS event (Event), which is the remainder when divided by 3.
  • the number of channels used by subsequent Sub-Events is the remainder of the addition of the number of channels used for the first time and the Sub-Event sequence number divided by 3.
  • the channel codes used in the three Sub_Intervals are 0, 1, and 2, respectively.
  • the channel codes used in the three Sub_Intervals are 1, 2, and 0, respectively.
  • the channel codes used in the three Sub_Intervals are 2, 0, and 1, respectively.
  • the audio sending device and the audio receiving device may select the channel with the predetermined bandwidth that covers the most useful channels according to the channel mapping table of adaptive frequency hopping for the Bluetooth low energy asynchronous connection channel of the high-speed physical layer; and updating the channel of the high-speed physical layer through a Bluetooth low energy asynchronous connection.
  • the audio sending device and the audio receiving device can connect the adaptive frequency hopping channel mapping table through the Bluetooth low energy asynchronous connection, and select the channel with the 20MHz bandwidth covering the most useful channels as the IEEE802.11n physical layer channel; and, update the channel of the IEEE802.11n physical layer through a Bluetooth Low Energy asynchronous connection.
  • the dynamic frequency configuration is to select the channel with the most 20MHz bandwidth covering the useful channels (Used Channels) as the channel of the IEEE802.11n PHY according to the channel mapping table of the adaptive frequency hopping of the BLE ACL link, wherein, The channel mapping table is passed or negotiated through the BLE ACL link, the BLE CIS is only used to transmit audio data, and the BLE ACL has various control protocols. And according to the channel change, the channel of the IEEE802.11n PHY used by the audio sending device and the audio receiving and playing device is updated in time through the BLE ACL link, and it can also be said that the channel of the IEEE802.11n PHY is negotiated through the BLE ACL link.
  • the channel mapping table of BLE ACL is that Used Channels include 37, 0-10, 32-36, 39 and other channels, and other channels, including 11-31 and 38, are Un-used Channels. Since 37, 0-10 channels are 2402-2422MHz frequency, a total of 20MHz channels, the center is at 2412MHz, so the center frequency of the IEEE802.11n PHY channel is set at 2412MHz.
  • the audio sending device establishes a BLE ACL connection with the audio receiving device (it can also be an audio receiving and playing device), and queries whether the audio receiving and playing device supports the ultra-low latency wireless audio service through the BLE ACL connection. If the audio receiving and playback device supports ultra-low-latency wireless audio services, when sending ultra-low-latency wireless audio, the audio sending device and the audio receiving and playback device establish a high-rate PHY CIS connection to transmit audio without compression loss data or unencoded audio data. On the contrary, BLE PHY is used to establish BLE Audio with BLE CIS transfer encoding.
  • An embodiment of the present invention further provides a wireless audio receiving method, wherein the receiving is that the audio receiving device receives from the audio transmitting device, the method is performed by the audio receiving device, and the receiving method includes:
  • Step A the audio receiving device establishes an isochronous stream connection based on the high-speed physical layer with the audio sending device; the minimum data transmission rate of the high-speed physical layer is higher than the maximum data transmission rate of the low-power bluetooth physical layer;
  • Step B The audio receiving device receives the first audio data from the audio transmitting device through the high-speed physical layer-based connection isochronous stream connection.
  • the audio receiving device can establish a low-power Bluetooth low energy asynchronous connection with the audio transmitting device based on the low-power bluetooth physical layer; the audio receiving device is connected with the audio transmitting device through the low-power Bluetooth asynchronous connection.
  • the device establishes an isochronous stream connection based on the high-speed physical layer connection.
  • the audio receiving device provides confirmation information whether the audio receiving device supports ultra-low-latency wireless audio transmission to the audio transmitting device through a low-power Bluetooth asynchronous connection;
  • the audio receiving device establishes an isochronous streaming connection based on the Bluetooth low energy physical layer Bluetooth low energy connection with the transmitting audio device through the Bluetooth low energy asynchronous connection.
  • An isochronous streaming connection via a Bluetooth power consumption connection to receive the second audio data from the audio sending device; or, the audio receiving device receiving the second audio data from the audio sending device through the low-power Bluetooth asynchronous connection;
  • the audio receiving device establishes an isochronous streaming connection based on the high-speed physical layer connection with the audio transmitting device through the Bluetooth low energy asynchronous connection.
  • the second audio data may be encoded Bluetooth low energy audio data; the first audio data may be audio data without compression loss or audio data without encoding.
  • the audio data received by the wireless audio receiving method corresponds to the transmitting method shown in FIG. 1 . Therefore, in one embodiment, the first audio data may be audio data without compression loss or audio data without encoding. In another embodiment, the second audio data may include encoded Bluetooth Low Energy audio data.
  • the high-speed physical layer is any one of a wireless local area network physical layer, a wireless ultra-wideband physical layer, or a predetermined broadband physical layer.
  • the data transfer rate of the high-speed physical layer is not lower than 4 Mbps.
  • the high-speed physical layer may be an IEEE 802.11n wireless local area network physical layer.
  • An embodiment of the present invention also provides a wireless audio transmission device, which can be used to implement the wireless audio transmission method in the foregoing embodiments, the device includes a baseband data and protocol processor, and a broadband radio frequency transceiver module, wherein:
  • the baseband data and protocol processor is configured to drive the broadband radio frequency transceiver module to establish a high-speed physical layer-based connection isochronous flow connection with the wireless audio receiving device, and through the isochronous flow connection of the connection, send the first information to the wireless audio receiving device. an audio data.
  • the device further includes a low-power Bluetooth radio frequency transceiver module
  • a baseband data and protocol processor configured to drive the low-power bluetooth radio frequency transceiver module to establish a low-power bluetooth asynchronous connection based on the low-power bluetooth physical layer with the wireless audio receiving device;
  • the baseband data and protocol processor are connected asynchronously through the low-power bluetooth, so that the broadband radio frequency transceiver module and the wireless audio receiving device establish a high-speed physical layer-based connection isochronous flow connection.
  • the baseband data and protocol processor is further configured to confirm whether the wireless audio receiving device supports ultra-low latency wireless audio transmission through the Bluetooth low energy asynchronous connection;
  • the baseband data and protocol processor is further configured to connect the low-power bluetooth asynchronously to enable the low-power bluetooth radio frequency transceiver module to communicate with the The wireless audio receiving device establishes a connection isochronous stream connection based on the Bluetooth low energy physical layer, and sends second audio data to the wireless audio receiving device through the connection isochronous stream connection; or the baseband data and protocol processor is configured to Send the second audio data to the wireless audio receiving device through the low-power Bluetooth asynchronous connection;
  • the baseband data and protocol processor drives the broadband radio frequency transceiver module, and sends the wireless audio receiving device to the wireless audio receiving device through the isochronous stream connection based on the high-speed physical layer connection.
  • the first audio data is sent.
  • Fig. 3 shows a structural diagram of a specific implementation manner of a wireless audio sending device provided by an embodiment of the present invention.
  • the sending device includes:
  • An audio processing and storage unit which performs one or more of filtering, denoising, encoding and equalization processing on the audio data input through the audio input interface, and/or stores the audio data input through the audio input interface;
  • the baseband data and protocol processor connects the isochronous stream protocol at least according to the low-power bluetooth protocol, drives the low-power bluetooth radio frequency transceiver module, and sends the aforementioned second audio data to the audio receiving device; or, at least according to the high-speed physical layer-based Connect the isochronous streaming protocol, drive the broadband radio frequency transceiver module, and send the aforementioned first audio data to the audio receiving device; the first audio data and the second audio data are obtained based on the audio data provided by the audio processing and storage unit. .
  • the low-power bluetooth radio frequency transceiver module driven by the baseband data and protocol processor, establishes a low-power bluetooth connection isochronous flow connection or low-power bluetooth asynchronous connection with the audio receiving device, and connects the isochronous flow through low-power bluetooth connection connect or low-power bluetooth asynchronous connection, and send the second audio data to the audio receiving device; or, establish a low-power bluetooth asynchronous connection with the audio receiving device, and confirm all the data through the low-power bluetooth asynchronous connection Whether the audio receiving device supports ultra-low latency wireless audio transmission;
  • the broadband radio frequency transceiver module driven by the baseband data and protocol processor, establishes a high-speed physical layer-based connection isochronous stream connection with the audio receiving device, and sends the first audio data to the audio receiving and playing device through the connection.
  • the sending device includes an audio input interface, an audio processing and storage unit, a baseband data and protocol processor, a BLE radio frequency transceiver module that provides BLE PHY, and a broadband radio frequency transceiver module that provides high-rate PHY.
  • Audio input interface includes wireless and priority input interface
  • wireless input interface includes audio line interface, USB interface, I2S interface or high-speed SPI, etc.
  • the audio processing and storage unit performs filtering, denoising, encoding or equalization processing on the audio data, and stores the audio data.
  • the audio sending device obtains external audio data through the audio input interface or obtains the internally stored audio data through the audio processing and storage unit for sending to the audio receiving and playing device.
  • the baseband data and protocol processor is used to execute the BLE protocol or the BLE CIS protocol, the CIS protocol of the high-speed PHY, the control program of the BLE radio frequency transceiver module and the broadband radio frequency transceiver module.
  • the BLE RF transceiver module is used to establish a BLE ACL connection and a BLE CIS connection between an audio sending device and an audio receiving and playback device, transmit BLE Audio audio data, and assist in establishing a CIS connection using a high-speed PHY.
  • the broadband radio frequency transceiver module is used for audio transmission equipment to transmit high-quality audio data, such as audio data without compression loss or audio data without encoding, to audio reception and playback equipment through a CIS connection using a high-speed PHY.
  • the BLE ACL protocol and the BLE CIS protocol can be executed simultaneously, and the BLE ACL protocol and the CIS protocol based on the high-speed physical layer can also be executed simultaneously, but the BLE CIS and the CIS based on the high-speed physical layer do not need to be executed simultaneously. In other embodiments, it does not exclude the situation of establishing two links (connections) at the same time, that is, one or more BLE PHY-based BLE CIS connections and one or more high-speed physical layer-based CIS connections.
  • the embodiments of this specification also provide a wireless audio receiving device, which can be used to implement the wireless audio receiving method described in the foregoing implementation, the device includes a baseband data and protocol processor, and a broadband radio frequency transceiver module, wherein:
  • the baseband data and protocol processor is configured to drive the wideband radio frequency transceiver module to establish a high-speed physical layer-based connection isochronous flow connection with the wireless audio transmission device, and receive data from the wireless audio transmission device through the isochronous flow connection of the connection of the first audio data.
  • the device further includes a low-power Bluetooth radio frequency transceiver module
  • a baseband data and protocol processor configured to drive the low-power bluetooth radio frequency transceiver module to establish a low-power bluetooth asynchronous connection based on the low-power bluetooth physical layer with the wireless audio transmission device;
  • the low-power bluetooth radio frequency transceiver module receives the second audio data from the wireless audio transmission device through the low-power bluetooth asynchronous connection;
  • the bluetooth-consuming radio frequency transceiver module establishes a high-speed physical layer-based connection isochronous flow connection with the wireless audio transmission device through the low-power bluetooth asynchronous connection, and through the high-speed physical layer-based connection Isochronous streaming connection, receiving the first audio data from the wireless audio transmission device; or the low-power Bluetooth radio frequency transceiver module establishes a low-power Bluetooth physical based connection with the wireless audio transmission device through the low-power Bluetooth asynchronous connection
  • the connection of the layer is an isochronous streaming connection, and through the connection isochronous streaming connection, the second audio data from the wireless audio transmission device is received.
  • the baseband data and protocol processor is configured to set whether the device supports ultra-low latency wireless audio services through general property configuration, and to provide wireless audio transmission devices through the Bluetooth low energy asynchronous connection.
  • General property configuration service query is configured to set whether the device supports ultra-low latency wireless audio services through general property configuration, and to provide wireless audio transmission devices through the Bluetooth low energy asynchronous connection.
  • FIG. 4 shows a structural diagram of a specific implementation manner of an ultra-low delay wireless audio receiving device provided by an embodiment of the present invention. As shown in Figure 4, the receiving device includes:
  • the low-power bluetooth radio frequency transceiver module is used to establish low-power bluetooth connection isochronous streaming connection or low-power bluetooth asynchronous connection with the audio transmission device driven by the baseband data and protocol processor, and connect isochronous low-power bluetooth connection Stream connection or BLE asynchronous connection, receive second audio data from the audio sending device; or, establish a BLE asynchronous connection with the audio sending device, and send the audio sending device through the BLE asynchronous connection, Provide confirmation information whether the audio receiving device supports ultra-low latency wireless audio transmission;
  • the broadband radio frequency transceiver module driven by the baseband data and protocol processor, is configured to establish a high-speed physical layer-based connection isochronous stream connection with the audio transmission device, and receive the first audio data from the audio transmission device through the connection.
  • the baseband data and protocol processor connects the isochronous stream protocol at least according to the low-power Bluetooth protocol, drives the low-power Bluetooth radio frequency transceiver module, and receives the second audio data from the audio receiving device; or, at least according to the connection based on the high-speed physical layer, etc.
  • the time stream protocol drives the broadband radio frequency transceiver module to receive the first audio data from the audio receiving device;
  • the audio output unit can perform one or more of decoding, filtering, denoising, or equalization processing on the received audio data.
  • the device may further include an audio playing unit, which converts the audio data into an audio signal, and outputs or plays the audio signal.
  • an ultra-low latency wireless audio receiving device can be an audio receiving and playing device, including a BLE radio frequency transceiver module providing BLE PHY, a broadband radio frequency transceiver module providing high-speed PHY, baseband data and protocol processing processor, audio processing and output unit.
  • the BLE RF transceiver module is used to establish BLE ACL connection and BLE CIS connection between audio receiving and playback equipment and audio transmitting equipment, transmit LE Audio audio data, and assist in establishing CIS connection using high-speed PHY.
  • the broadband radio frequency transceiver module is used for audio receiving and playback equipment to receive high-quality audio data sent by audio transmitting equipment through the CIS connection using high-speed PHY, such as audio data without compression loss or audio data without encoding.
  • the baseband data and protocol processor is used to execute the BLE protocol or the BLE CIS protocol, the CIS protocol using the high-speed PHY, the control program of the BLE radio frequency transceiver module and the broadband radio frequency transceiver module.
  • the audio processing and output unit is used to decode, filter, denoise, or equalize the audio data, and output or play the audio signal.
  • a wireless local area network is used in the low-power Bluetooth audio transmission.
  • the high-speed physical layer represented by the physical layer as an optional physical layer, transmits audio data without compression loss or encoding based on CIS transmission rules, and adopts automatic frequency hopping or dynamic frequency configuration methods to resist WIFI interference to stabilize communication performance.
  • a software module can be placed in random access memory (RAM), internal memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other in the technical field. in any other known form of storage medium.
  • RAM random access memory
  • ROM read only memory
  • electrically programmable ROM electrically erasable programmable ROM
  • registers hard disk, removable disk, CD-ROM, or any other in the technical field. in any other known form of storage medium.

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Abstract

本发明实施例提供一种无线音频发送和接收方法，以及相应的发送/接收设备。该方法包括：音频发送设备，建立与音频接收设备的基于高速物理层的连接等时流连接；高速物理层的最低数据传输速率高于低功耗蓝牙物理层的最高数据传输速率；音频发送设备通过基于高速物理层的连接等时流连接,向音频接收设备发送第一音频数据。

Description

低延迟无线音频发送和接收方法及设备
相关申请的交叉引用
本申请主张在2020年9月29日在中国提交的中国专利申请号No.202011050965.3的优先权，其全部内容通过引用包含于此。
技术领域
本发明涉及无线通信领域，更具体地，涉及一种可提供低延迟音频传输服务的无线音频发送和接收方法及设备。
背景技术
无线音频技术给人们带来无拘无束的自由通话或音乐享受，获得了人们的广泛喜爱。尤其是目前最新的基于连接等时流(CIS:Connected Isochronous Stream)协议及低复杂度通信编解码(LC3:Low Complexity Communication Codec)技术的低功耗蓝牙(BLE:Bluetooth Low Energy)音频(Audio)技术，将给人们带来更低功耗、更低成本、更高性能的无线音频服务。CIS协议规定了一个等时间隔内发生一次CIS事件，每个CIS事件由一个或多个子事件组成。发射机在每个CIS子事件中发送数据，接收机在每个CIS子事件中接收数据并做出确认的响应。每次发送数据均有时长限制，在该时长限制外接收到的数据将被丢弃。由此可保障数据传输效率和同步性能。但是，工作在2.4GHz ISM(Industrial Scientific Medical)无线频段，负责从物理信道发送和接收数据包的低功耗蓝牙物理层(Physical Layer，简称PHY)的传输速率却比较低，即使是当前最新版本的蓝牙技术规范5.2，其物理层最高数据传输速率也通常仅为1Mbps或2Mbps，因而难以提供超低延迟且无压缩损失的无线音频服务，尤其无法满足对延迟和音频质量要求都非常高的游戏耳机玩家的需求。然而，现有的高速率的短距离无线通信技术，如无线局域网IEEE802.11n协议等，受限于其复杂的数据传输机制也难以满足超低延迟和高性能的需求。
发明内容
本发明公开一种无线音频发送和接收方法，及其相应的发送/接收设备，可以提供低延迟的音频传输服务。
本发明为解决上述技术问题采用的技术方案为，一方面提供一种无线音频发送方法，所述发送为从音频发送设备向音频接收设备发送，所述方法由所述音频发送设备执行，其特征在于，所述方法包括：
所述音频发送设备，建立与所述音频接收设备的基于高速物理层的连接等时流连接；所述高速物理层的最低数据传输速率高于低功耗蓝牙物理层的最高数据传输速率；
所述音频发送设备通过所述基于高速物理层的连接等时流连接,向所述音频接收设备发送第一音频数据。
可选地，所述音频发送设备，建立与所述音频接收设备的基于高速物理层的连接等时流连接，包括：
所述音频发送设备，基于低功耗蓝牙物理层建立与所述音频接收设备的低功耗蓝牙非同步连接，所述音频发送设备通过所述低功耗蓝牙非同步连接，与所述音频接收设备建立基于所述高速物理层的连接等时流连接。
具体地,所述方法还包括：所述音频发送设备通过所述低功耗蓝牙非同步连接,确认所述音频接收设备是否支持超低延迟无线音频传输；
如果不支持，则所述音频发送设备通过所述低功耗蓝牙非同步连接，与所述音频接收设备建立基于低功耗蓝牙物理层的低功耗蓝牙连接等时流连接，通过该低功耗蓝牙连接等时流连接，向音频接收设备发送第二音频数据；或，所述音频发送设备通过所述低功耗蓝牙非同步连接，向音频接收设备发送第二音频数据；
如果支持，则所述音频发送设备通过所述低功耗蓝牙非同步连接，与所述音频接收设备建立基于所述高速物理层的连接等时流连接。
更具体地，所述确认音频接收设备是否支持超低延迟无线音频传输，包括，
通过访问音频接收设备的一般属性配置服务，确认音频接收设备是否支持超低延迟无线音频传输。
更具体地，所述第二音频数据包括，经过编码的低功耗蓝牙音频数据；所 述第一音频数据包括，无压缩损失的音频数据或不编码的音频数据。
可选地，所述高速物理层的数据传输速率不低于4Mbps。
具体地，所述高速物理层包括，无线局域网物理层、无线超宽带物理层或预定宽带物理层中任意一种。
更具体地，所述高速物理层包括IEEE802.11n无线局域网物理层。
进一步具体地，基于高速物理层的连接等时流连接的配置为，采用20MHz带宽，采用1.25ms或2.5ms的等时间隔，设置音频数据包与确认包之间的时间间隔为短帧间间隔，设置最小子事件距离等于所述短帧间间隔；
所述无线音频发送方法还包括，
音频发送设备发送采样率为48kHz、量化位数为16比特的不编码立体声音频，等时间隔为2.5ms；发送的音频数据包大小为480字节，采用2.4GHz ISM频段、20MHz带宽的IEEE802.11n物理层的调制编码集，调制编码集索引值为4，传输速率39Mbps，采用HT_GF格式，BCC_CODING编码方式，LONG_GI保护间隔，音频数据包的时间长度为136us；
采用调制编码集索引值为1的确认包，确认单元时间长度为40us；
最小子事件距离以及短帧间间隔为10us，子事件数为3，最大传输延迟为588us，音频处理延迟为412us，音频采样从截获到播放的最低延迟为3.5ms。
进一步具体地，将所述高速物理层工作的无线频段划分为N个不交叠的预定带宽的信道，基于预定的自动跳频规则，使一个等时间隔内的相邻两个子事件发送信号所使用的信道编号不同；所述N为大于1的正整数。
根据具体的例子，基于所述高速物理层的连接等时流连接的配置为，采用2.4GHz ISM频段、20MHz带宽，把2.4GHz ISM频段分为N个不交叠的20MHz带宽的信道，设置其信道编号分别为0～N-1，N为2或3；
所述预定的自动跳频规则包括：在每个等时间隔内，第一次子事件E1发送使用的信道编号为连接等时流事件的序列号除以N的余数；所述第一次子事件E1之后的子事件Ex发送使用的信道编号为，E1发送使用的信道编号与该子事件Ex的序列号相加后再除以N的余数。
具体地,所述方法还包括，
所述音频发送设备与所述音频接收设备，根据所述低功耗蓝牙非同步连 接自适应跳频的信道映射表，选择其中覆盖有用信道最多的预定带宽的信道作为所述高速物理层的信道；以及，
通过低功耗蓝牙非同步连接，更新所述高速物理层的信道。
第二方面,提供一种无线音频接收方法，所述接收为音频接收设备从音频发送设备接收，所述方法由所述音频接收设备执行，其特征在于，包括：
所述音频接收设备，与所述音频发送设备建立基于高速物理层的连接等时流连接；所述高速物理层的最小数据传输速率高于低功耗蓝牙物理层的最高数据传输速率；
所述音频接收设备通过所述基于高速物理层的连接等时流连接,从音频发送设备接收第一音频数据。
可选地，所述音频接收设备，与所述音频发送设备建立基于高速物理层的连接等时流连接，包括，
所述音频接收设备，与所述音频发送设备基于低功耗蓝牙物理层建立低功耗蓝牙非同步连接；所述音频接收设备通过所述低功耗蓝牙非同步连接，与所述音频发送设备建立基于所述高速物理层的连接等时流连接。
具体地,所述音频接收设备通过所述低功耗蓝牙非同步连接，向所述音频发送设备，提供所述音频接收设备是否支持超低延迟无线音频传输的确认信息；
如果不支持，则所述音频接收设备，通过所述低功耗蓝牙非同步连接，与所述发送音频设备建立基于低功耗蓝牙物理层的低功耗蓝牙连接等时流连接，通过该低功耗蓝牙连接等时流连接，从音频发送设备接收第二音频数据；或，所述音频接收设备通过所述低功耗蓝牙非同步连接，从音频发送设备接收第二音频数据；
如果支持，则所述音频接收设备通过所述低功耗蓝牙非同步连接，与所述音频发送设备建立基于所述高速物理层的连接等时流连接。
具体地，所述音频接收设备通过其一般属性配置服务，向所述音频发送设备，提供所述音频接收设备是否支持超低延迟无线音频传输的确认信息；
所述第二音频数据包括，经过编码的低功耗蓝牙音频数据；
所述第一音频数据包括，无压缩损失的音频数据或不编码的音频数据；
所述高速物理层的数据传输速率不低于4Mbps。
第三方面提供一种无线音频发送设备，其特征在于，所述发送设备实现第一方面所述的方法，以及包括基带数据与协议处理器、宽带射频收发模块，其中：
所述基带数据与协议处理器，被配置为驱动所述宽带射频收发模块与无线音频接收设备建立基于高速物理层的连接等时流连接，并通过该连接等时流连接，向无线音频接收设备发送第一音频数据。
可选地,所述设备，还包括低功耗蓝牙射频收发模块；
所述基带数据与协议处理器，被配置为驱动所述低功耗蓝牙射频收发模块与无线音频接收设备建立基于低功耗蓝牙物理层的低功耗蓝牙非同步连接；
所述基带数据与协议处理器通过所述低功耗蓝牙非同步连接，使所述宽带射频收发模块与无线音频接收设备建立基于高速物理层的连接等时流连接。
具体地，所述基带数据与协议处理器还被配置为通过所述低功耗蓝牙非同步连接，确认无线音频接收设备是否支持超低延迟无线音频传输；
在确认无线音频接收设备不支持超低延迟无线音频传输时，所述基带数据与协议处理器还被配置为通过所述低功耗蓝牙非同步连接，使所述低功耗蓝牙射频收发模块与无线音频接收设备建立基于低功耗蓝牙物理层的连接等时流连接，并通过该连接等时流连接向无线音频接收设备发送第二音频数据；或者所述基带数据与协议处理器被配置为通过所述低功耗蓝牙非同步连接向无线音频接收设备发送第二音频数据；
在确认无线音频接收设备支持超低延迟无线音频传输时，所述基带数据与协议处理器驱动所述宽带射频收发模块，通过所述基于高速物理层的连接等时流连接，向无线音频接收设备发送所述第一音频数据。
第三方面提供一种无线音频接收设备，其特征在于，所述接收设备实现第二方面所述的方法，以及包括基带数据与协议处理器、宽带射频收发模块，其中：
所述基带数据与协议处理器，被配置为驱动所述宽带射频收发模块与无线音频发送设备建立基于高速物理层的连接等时流连接，并通过所述连接等时流连接，接收来自无线音频发送设备的第一音频数据。
可选地,所述设备还包括低功耗蓝牙射频收发模块；
所述基带数据与协议处理器，被配置为驱动所述低功耗蓝牙射频收发模块与无线音频发送设备建立基于低功耗蓝牙物理层的低功耗蓝牙非同步连接；
在所述基带数据与协议处理器的驱动下，所述低功耗蓝牙射频收发模块通过所述低功耗蓝牙非同步连接接收来自无线音频发送设备的第二音频数据；或者，所述低功耗蓝牙射频收发模块通过所述低功耗蓝牙非同步连接，使所述宽带射频收发模块与无线音频发送设备建立基于高速物理层的连接等时流连接，并通过所述基于高速物理层的连接等时流连接，接收来自无线音频发送设备的第一音频数据；或者所述低功耗蓝牙射频收发模块通过所述低功耗蓝牙非同步连接，与无线音频发送设备建立基于低功耗蓝牙物理层的连接等时流连接，并通过该连接等时流连接，接收来自无线音频发送设备的第二音频数据。
具体地，所述基带数据与协议处理器被配置为，通过一般属性配置设置本设备是否支持超低延迟无线音频服务，并通过所述低功耗蓝牙非同步连接，向无线音频发送设备提供一般属性配置服务查询。
本发明实施例提供的一种无线音频发送和接收方法，及其相应的发送/接收设备，在无线音频发送设备和接收设备之间，基于数据传输速率高于低功耗蓝牙物理层的传输速率的高速物理层，建立连接等时流连接，由此可提供低延迟的无线音频传输服务。
本发明实施例还具有其它诸多有益技术效果，将在以下结合具体技术实施方案详细描述。
附图说明
图1为本发明实施例提供的一种无线音频发送方法的流程图；
图2为本发明实施例提供的一个无线音频传输场景的示意图；
图3为本发明实施例提供的一种无线音频发送设备的一种具体实施方式的结构图；
图4为本发明实施例提供的一种无线音频接收设备的一种具体实施方式的结构图；
图5为本发明实施例提供的采用高速物理层的连接等时流链路的时隙结构的结构图；
下面通过附图和实施例，对本发明的技术方案做进一步的详细描述。
具体实施方式
为了使本发明的目的、技术方案和优点更加清楚，下面结合附图及实施例对本发明作进一步地详细描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它的实施例，都属于本发明保护的范围。
如前所述，低功耗蓝牙(BLE:Bluetooth Low Energy)音频(Audio)技术，带来更低功耗、更低成本及更高质量的无线音频服务。尤其是基于连接等时流(CIS)协议及低复杂度通信编解码(LC3)技术的低功耗蓝牙(BLE:Bluetooth Low Energy)音频(Audio)技术，可以提供更低功耗和成本、更高性能的无线音频服务。但是其最大传输速率比较低，限制了无线音频质量的提高。现有技术中，为了提高BLE无线传输速率，可以降低BLE所采用的GFSK调制的符号周期。
但是，在需要超低延迟的场景,BLE Audio依然存在性能上的问题,原因在于BLE Audio传输速率低，必须依赖高压缩率的音频编码技术，因而难以提供超低延迟且无压缩损失的无线音频服务，尤其无法满足对延迟和音频质量要求都非常高的游戏耳机玩家的需求。然而，直接采用现有的高速率通信技术，如无线局域网IEEE802.11n协议，也难以满足超低延迟和高性能的需求,根本原因在于无线局域网协议的设计目的，其本身不能满足诸如高实时、超低延时的音频性能要求。
为解决这个问题，本发明实施例提出一种可实现超低延迟传输的无线音频发送和接收方法。其中，音频发送设备与音频接收设备建立基于高速物理层的连接等时流连接；所述高速物理层的最小数据传输速率高于低功耗蓝牙物理层的最高数据传输速率；音频发送设备通过所述基于高速物理层的连接等时流CIS连接(以下实施例中也可称CIS链路),向所述音频接收设备发送第 一音频数据。
目前现有技术中通常采用的短距离无线通信技术中，无线局域网IEEE802.11a的最高数据传输速率可达到54Mbps，IEEE802.11b的最大数据传输速率可达到11Mbps，而无线超宽带UWB更可以达到几十兆比特每秒到几百兆比特每秒，远高于蓝牙，也高于IEEE 802.11n。采用基于高速物理层建立的连接等时流(CIS)连接传输音频数据，在CIS连接的一个等时间隔内，实现音频数据的有限次数的发送、重传和接收确认，可以显著提升基于高速物理层的音频数据传输效率，降低延迟。在一种较佳实施例中，可以采用数据传输速率不低于4Mbps的高速物理层从物理信道发送和接收数据包。在另一种较佳实施例中，设置所述基于高速物理层的CIS连接的等时间隔(ISO_Interval)、子事件间隔(Sub_Interval)，最小子事件距离(T_MSS:Minimum Sub-event Space)，数据包(Data)与确认包(ACK)之间的时间间隔中的一个或多个参数，使其比基于低功耗蓝牙物理层的CIS连接中可适用的相应参数更小，以获得超低延迟的通信效果。
在一种具体实施例中，所述音频发送设备还可以基于低功耗蓝牙物理层建立与所述音频接收设备的低功耗蓝牙非同步连接(ACL:Asynchronous Connection-oriented Link)(以下实施例中也可以称为ACL链路)，通过BLE ACL连接，协商建立CIS连接所需参数，从而协助建立基于高速物理层的连接等时流连接。
图2示出本发明实施例提供的一个超低延迟无线音频传输场景的示意图。该场景中构成超低延迟无线音频系统的设备包括音源设备，音频发送设备、音频接收与播放设备。在具体的实施例中，音源设备可以包括电视，电脑，智能手机等，也包括音频存储设备。音频发送设备与音源设备通过有线或无线方式连接，音频接收与播放设备同音频发送设备无线连接。在具体的实施例中，有线连接方式可以是音频线，USB接口，I2S接口或高速SPI等。在具体的实施例中，无线连接可以是基于蓝牙通信协议、无线局域网通信协议等标准或专用无线通信协议实现的无线连接。本场景中可以具体包括采用低功耗蓝牙(BLE)物理层(PHY)的BLE非同步连接连接和BLE CIS连接，采用高速PHY的CIS连接。所述的高速率PHY具体可以采用无线局域网PHY， 无线超宽带PHY或其它自定义的最低数据传输速率高于BLE PHY最高数据传输速率的PHY等。在一个实施例中，采用的高速率PHY为IEEE802.11n无线局域网PHY。
图1示出本发明实施例提供的一种无线音频发送方法的流程图。所述发送为从音频发送设备向音频接收设备发送，该方法由所述音频发送设备执行，如图1所示,该方法至少包括如下步骤:
步骤11，音频发送设备，建立与音频接收设备的基于高速物理层的连接等时流连接；高速物理层的最低数据传输速率高于低功耗蓝牙物理层的最高数据传输速率。
在不同的实施例中，高速物理层可以是无线局域网物理层、无线超宽带物理层中的一种，也可是其他的预定宽带物理层，但是所采用的物理层的最低数据传输速率应当高于低功耗蓝牙物理层的最高数据传输速率。在一种可选实施方式中，所述高速物理层的数据传输速率不低于4Mbps，4Mbps是依据传输无损高保真音频的速率最低要求而确认。
根据一种实施方式，音频发送设备，可以基于低功耗蓝牙物理层建立与所述音频接收设备的低功耗蓝牙非同步连接，所述音频发送设备通过所述低功耗蓝牙非同步连接，与所述音频接收设备建立基于所述高速物理层的连接等时流连接。
通常，在建立基于高速物理层的连接等时流连接之前，可以首先确定音频接收设备是否具有建立这种连接进行传输的能力，因此，在一个实施例中，音频发送设备还可以通过低功耗蓝牙非同步连接,确认音频接收设备是否支持超低延迟无线音频传输；
如果不支持，则音频发送设备通过低功耗蓝牙非同步连接，与音频接收设备建立基于低功耗蓝牙物理层的低功耗蓝牙连接等时流连接，通过该低功耗蓝牙连接等时流连接，向音频接收设备发送第二音频数据；或，音频发送设备通过低功耗蓝牙非同步连接，向音频接收设备发送第二音频数据；
如果支持，则音频发送设备通过低功耗蓝牙非同步连接，与所述音频接收设备建立基于高速物理层的连接等时流连接。
在一个实施例中，可以通过访问音频接收设备的一般属性配置服务，确 认音频接收设备是否支持超低延迟无线音频传输。一般属性配置服务(Generic Attribute Profile，GATT)具有可供查询己方所能实现的服务的功能，支持超低延迟无线音频传输的设备可以具有表征该能力的特征值或者服务，发送设备通过查询接收设备的GATT，知晓接收设备的能力。在不同例子中，也可以不通过GATT，而通过其它的方式确认该设备是否支持超低延迟无线音频传输。
在另一个实施例中，第二音频数据可以是经过编码的低功耗蓝牙音频数据。
根据一种实施方式，高速物理层可以是IEEE802.11n无线局域网物理层。在更具体的实施方式中，基于高速物理层的连接等时流连接的配置还可以为，采用20MHz带宽，支持1.25ms和2.5ms的等时间隔，音频数据包与确认包之间的时间间隔设置为短帧间间隔(SIFS,Short Interframe Space)，最小子事件距离(T_MSS:Minimum Sub-event Space)设置为短帧间间隔。在包交换序列中，两个连续包之间的时间间隔称为帧间隔(IFS)，SIFS是最短的帧间隔，通常用来间隔需要立即响应的包。
图5示出为本发明实施例提供的采用高速物理层的连接等时流链路的时隙结构的结构图。如图5所示，在等时间隔(ISO_Interval)内，主设备(Master)可以多次发送音频数据(Data)，直到正确接收到从设备(Slave)回复的确认信息(ACK)或达到最大发送次数或子事件(Sub-Event)数。相对于BLE PHY，采用高速率PHY，CIS采用更小的ISO_Interval，更小的子事件间隔(Sub_Interval)，更短的最小子事件距离(T_MSS:Minimum Sub-event Space)，更小的数据包(Data)与确认包(ACK)之间的时间间隔，从而可以提高传输效率。参照上述结构，在一个具体的实施例中，可以采用20MHz带宽的高速物理层，如IEEE802.11n PHY，设置1.25ms和2.5ms的ISO_Interval，Data与ACK之间的间隔等于SIFS(Short Interframe Space)，T_MSS等于SIFS。
步骤12，音频发送设备通过基于高速物理层的连接等时流连接,向音频接收设备发送第一音频数据。
在一个实施例中，第一音频数据可以是无压缩损失的音频数据或不编码的音频数据。
在一个实施例中，基于高速物理层的连接等时流连接的配置为，采用 20MHz带宽，采用1.25ms或2.5ms的等时间隔，设置音频数据包与确认包之间的时间间隔为短帧间间隔，设置最小子事件距离等于所述短帧间间隔；
该实施例中,无线音频发送方法还包括，音频发送设备发送采样率为48kHz、量化位数为16比特的不编码立体声音频，等时间隔为2.5ms；发送的音频数据包大小为480字节，采用2.4GHz ISM频段、20MHz带宽的IEEE802.11n物理层的调制编码集，调制编码集索引值为4，传输速率39Mbps，采用HT_GF格式，BCC_CODING编码方式，LONG_GI保护间隔，音频数据包的时间长度为136us；采用调制编码集索引值为1的确认包，确认单元时间长度为40us；最小子事件距离以及短帧间间隔为10us，子事件数为3，最大传输延迟为588us，音频处理延迟为412us，音频采样从截获到播放的最低延迟为3.5ms。
本发明实施例提供的无线音频发送方法,采用高速物理层，特别是无线局与网物理层时的最大挑战是WIFI干扰。由于通常的WIFI包较长，而本发明实施例中的数据包长较短，因此WIFI信号可能在相对较长时间内占据信道，从而干扰依照本发明方法进行的音频发送。为此本发明实施例提供了两种抗WIFI干扰的方法，一种是自动跳频，另一种是动态频率配置。
在一个实施例中,可以将所述高速物理层工作的无线频段划分为N个不交叠的预定带宽的信道，基于预定的自动跳频规则，使一个等时间隔内的相邻两个子事件发送信号所使用的信道编号不同；所述N为大于1的正整数。
根据一种实施方式，可以把基于所述高速物理层的连接等时流连接的配置为，采用2.4GHz ISM频段、20MHz带宽，把2.4GHz ISM频段分为N个不交叠的20MHz带宽的信道，设置其信道编号分别为0～N-1，这里的N为2或3；
所述预定的自动跳频规则包括：在每个等时间隔内，第一次子事件E1发送使用的信道编号为连接等时流事件的序列号(该序列号的作用为对每个CIS事件顺序计数)除以N的余数；所述第一次子事件E1之后的子事件Ex发送使用的信道编号为，E1发送使用的信道编号与该子事件Ex的序列号相加后再除以N的余数。可以理解,上述求余的数学方法计算跳频信道,只是确定跳频信道的一种方案，在不同的实施例中,还可以采用不同的具体实施方式。
在一个更具体的实施方式中，自动跳频方式即使把2.4GHz频段分为三个不交叠的20MHz带宽的信道，并编号为0,1,2。每个ISO Interval内第一次发送使用的信道编号为当前CIS事件(Event)的序列号为除以3的余数。后续Sub-Event使用的信道数为第一次使用的信道数与Sub-Event序列号相加除以3的余数。例如，第一个ISO Interval，三个Sub_Interval内使用的信道编码分别为0，1，2。第二个ISO Interval，三个Sub_Interval内使用的信道编码分别为1，2，0。第三个ISO Interval，三个Sub_Interval内使用的信道编码分别为2，0，1。
在另一个实施例中,音频发送设备与所述音频接收设备，可以根据所述低功耗蓝牙非同步连接自适应跳频的信道映射表，选择其中覆盖有用信道最多的预定带宽的信道作为所述高速物理层的信道；以及，通过低功耗蓝牙非同步连接，更新所述高速物理层的信道。
根据一种实施方式，音频发送设备与所述音频接收设备可以通过低功耗蓝牙非同步连接自适应跳频的信道映射表，选择其中覆盖有用信道最多的20MHz带宽的信道作为IEEE802.11n物理层的信道；以及，通过低功耗蓝牙非同步连接，更新IEEE802.11n物理层的信道。
根据一种具体的实施方式，动态频率配置即根据BLE ACL链路自适应跳频的信道映射表，选择覆盖有用信道(Used Channels)最多的20MHz带宽的信道作为IEEE802.11n PHY的信道，其中，信道映射表是通过BLE ACL链路来传递或协商的，BLE CIS仅仅是用于传输音频数据的，而BLE ACL则有多种控制协议。并根据信道变化及时通过BLE ACL链路更新音频发送设备和音频接收与播放设备使用的IEEE802.11n PHY的信道，也可以说通过BLE ACL链路来协商IEEE802.11n PHY的信道。例如，BLE ACL的信道映射表为，Used Channels包括37，0-10，32-36,39等信道，其它信道，包括11-31和38都是Un-used Channels。由于37、0-10信道即2402-2422MHz频率，共20MHz的信道，其中心在2412MHz，因此将IEEE802.11n PHY的信道的中心频率设置在2412MHz。
在一个具体的实施例中，音频发送设备与音频接收设备(还可以是音频接收与播放设备)建立BLE ACL连接，通过BLE ACL连接查询音频接收与播放 设备是否支持超低延迟无线音频服务。如果音频接收与播放设备支持超低延迟无线音频服务，则在发送超低延迟无线音频时，音频发送设备与音频接收与播放设备建立采用高速率PHY的CIS连接，用于传输无压缩损失的音频数据或不编码的音频数据。反之，则采用BLE PHY建立BLE CIS传输编码的BLE Audio。
本发明实施例还提供一种无线音频接收方法，所述接收为音频接收设备从音频发送设备接收，该方法由音频接收设备执行，该接收方法包括：
步骤A：音频接收设备，与音频发送设备建立基于高速物理层的连接等时流连接；高速物理层的最小数据传输速率高于低功耗蓝牙物理层的最高数据传输速率；
步骤B：音频接收设备通过基于高速物理层的连接等时流连接,从音频发送设备接收第一音频数据。
在一个实施例中,音频接收设备,可以与音频发送设备基于低功耗蓝牙物理层建立低功耗蓝牙非同步连接；音频接收设备通过所述低功耗蓝牙非同步连接，与所述音频发送设备建立基于所述高速物理层的连接等时流连接。
根据一种实施方式,音频接收设备通过低功耗蓝牙非同步连接,向所述音频发送设备，提供所述音频接收设备是否支持超低延迟无线音频传输的确认信息；
如果不支持，则所述音频接收设备，通过所述低功耗蓝牙非同步连接，与所述发送音频设备建立基于低功耗蓝牙物理层的低功耗蓝牙连接等时流连接，通过该低功耗蓝牙连接等时流连接，从音频发送设备接收第二音频数据；或，所述音频接收设备通过所述低功耗蓝牙非同步连接，从音频发送设备接收第二音频数据；
如果支持，则所述音频接收设备通过所述低功耗蓝牙非同步连接，与所述音频发送设备建立基于所述高速物理层的连接等时流连接。
在一个实施例中,第二音频数据可以是经过编码的低功耗蓝牙音频数据；第一音频数据可以是无压缩损失的音频数据或不编码的音频数据。
该无线音频接收方法接收的音频数据与图1所示发送方法相对应，因此，在一个实施例中，第一音频数据可以是无压缩损失的音频数据或不编码的音 频数据。在另一个实施例中，第二音频数据可以包括经过编码的低功耗蓝牙音频数据。
同理，在一个实施例中，高速物理层为无线局域网物理层、无线超宽带物理层或预定宽带物理层中任意一种。在另一个实施例中，高速物理层的数据传输速率不低于4Mbps。在又一个实施例中，高速物理层可以是IEEE802.11n无线局域网物理层。
本发明实施例还提供一种无线音频发送设备，该发送设备可以用于实现前述实施例中无线音频发送方法，该设备包括基带数据与协议处理器、宽带射频收发模块，其中：
基带数据与协议处理器，被配置为驱动所述宽带射频收发模块与无线音频接收设备建立基于高速物理层的连接等时流连接，并通过该连接等时流连接，向无线音频接收设备发送第一音频数据。
在一个实施例中,该设备还包括低功耗蓝牙射频收发模块；
基带数据与协议处理器，被配置为驱动所述低功耗蓝牙射频收发模块与无线音频接收设备建立基于低功耗蓝牙物理层的低功耗蓝牙非同步连接；
基带数据与协议处理器通过所述低功耗蓝牙非同步连接，使所述宽带射频收发模块与无线音频接收设备建立基于高速物理层的连接等时流连接。
在又一个实施例中，基带数据与协议处理器还被配置为通过所述低功耗蓝牙非同步连接，确认无线音频接收设备是否支持超低延迟无线音频传输；
在确认无线音频接收设备不支持超低延迟无线音频传输时，所述基带数据与协议处理器还被配置为通过所述低功耗蓝牙非同步连接，使所述低功耗蓝牙射频收发模块与无线音频接收设备建立基于低功耗蓝牙物理层的连接等时流连接，并通过该连接等时流连接向无线音频接收设备发送第二音频数据；或者所述基带数据与协议处理器被配置为通过所述低功耗蓝牙非同步连接向无线音频接收设备发送第二音频数据；
在确认无线音频接收设备支持超低延迟无线音频传输时，所述基带数据与协议处理器驱动所述宽带射频收发模块，通过所述基于高速物理层的连接等时流连接，向无线音频接收设备发送所述第一音频数据。
图3示出本发明实施例提供的一种无线音频发送设备的一种具体实施方 式的结构图。如图3所示，该发送设备包括：
音频输入接口；
音频处理与存储单元，对通过音频输入接口输入的音频数据进行滤波、消噪、编码和均衡处理中的一种或多种，和/或存储通过音频输入接口输入的音频数据；
基带数据与协议处理器，至少根据低功耗蓝牙协议连接等时流协议，驱动低功耗蓝牙射频收发模块，向音频接收设备发送前述的第二音频数据；或，至少根据基于高速物理层的连接等时流协议，驱动宽带射频收发模块，向音频接收设备发送前述的第一音频数据；所述第一音频数据、第二音频数据均为基于所述音频处理与存储单元提供的音频数据获得。
低功耗蓝牙射频收发模块，在基带数据与协议处理器驱动下，与音频接收设备建立低功耗蓝牙连接等时流连接或低功耗蓝牙非同步连接，通过低功耗蓝牙连接等时流连接或低功耗蓝牙非同步连接，向音频接收设备发送所述第二音频数据；或，与音频接收设备建立低功耗蓝牙非同步连接，通过所述低功耗蓝牙非同步连接，确认所述音频接收设备是否支持超低延迟无线音频传输；
宽带射频收发模块，在基带数据与协议处理器驱动下，与音频接收设备建立基于高速物理层的连接等时流连接，通过该连接,向音频接收与播放设备发送第一音频数据。
根据一种具体的实施方式，发送设备包括音频输入接口，音频处理与存储单元，基带数据与协议处理器，提供BLE PHY的BLE射频收发模块，和提供高速率PHY的宽带射频收发模块。音频输入接口包括无线和优先输入接口，无线输入接口包括音频线接口，USB接口，I2S接口或高速SPI等。音频处理与存储单元对音频数据做滤波、消噪、编码或均衡等处理，并存储音频数据。音频发送设备通过音频输入接口获取外部音频数据或通过音频处理与存储单元获取内部存储的音频数据用于发送给音频接收与播放设备。基带数据与协议处理器用于执行BLE协议或BLE CIS协议，采用高速PHY的CIS协议，BLE射频收发模块和宽带射频收发模块的控制程序。BLE射频收发模块用于音频发送设备与音频接收与播放设备建立BLE ACL连接和BLE CIS 连接，传输BLE Audio音频数据，以及协助建立采用高速率PHY的CIS连接。宽带射频收发模块用于音频发送设备通过采用高速率PHY的CIS连接给音频接收与播放设备发送高质量音频数据，如无压缩损失的音频数据或不编码的音频数据。
本发明的实施例中，BLE ACL协议和BLE CIS协议可以同时执行，BLE ACL协议和基于高速物理层的CIS协议也可以同时执行，但是BLE CIS与基于高速物理层的CIS不需要同时执行。在其他实施方式中，但也不排除同时建立两条链路(连接)的情况，也就是一条或多条基于BLE PHY的BLE CIS连接和一条或多条基于高速物理层的CIS连接。
本说明书实施例还提供一种无线音频接收设备，所述接收设备可以用于实现前述实施中所述的无线音频接收方法，该设备包括基带数据与协议处理器、宽带射频收发模块，其中：
基带数据与协议处理器，被配置为驱动所述宽带射频收发模块与无线音频发送设备建立基于高速物理层的连接等时流连接，并通过所述连接等时流连接，接收来自无线音频发送设备的第一音频数据。
在一个实施例中，该设备还包括低功耗蓝牙射频收发模块；
基带数据与协议处理器，被配置为驱动所述低功耗蓝牙射频收发模块与无线音频发送设备建立基于低功耗蓝牙物理层的低功耗蓝牙非同步连接；
在所述基带数据与协议处理器的驱动下，所述低功耗蓝牙射频收发模块通过所述低功耗蓝牙非同步连接接收来自无线音频发送设备的第二音频数据；或者，所述低功耗蓝牙射频收发模块通过所述低功耗蓝牙非同步连接，使所述宽带射频收发模块与无线音频发送设备建立基于高速物理层的连接等时流连接，并通过所述基于高速物理层的连接等时流连接，接收来自无线音频发送设备的第一音频数据；或者所述低功耗蓝牙射频收发模块通过所述低功耗蓝牙非同步连接，与无线音频发送设备建立基于低功耗蓝牙物理层的连接等时流连接，并通过该连接等时流连接，接收来自无线音频发送设备的第二音频数据。
在另一个实施中，基带数据与协议处理器被配置为，通过一般属性配置设置本设备是否支持超低延迟无线音频服务，并通过所述低功耗蓝牙非同步 连接，向无线音频发送设备提供一般属性配置服务查询。
图4示出本发明实施例提供的一种超低延迟无线音频接收设备的一种具体实施方式的结构图。如图4所示，该接收设备包括：
低功耗蓝牙射频收发模块，为在基带数据与协议处理器驱动下，与音频发送设备建立低功耗蓝牙连接等时流连接或低功耗蓝牙非同步连接，通过低功耗蓝牙连接等时流连接或低功耗蓝牙非同步连接，从音频发送设备接收第二音频数据；或，与音频发送设备建立低功耗蓝牙非同步连接，通过低功耗蓝牙非同步连接，向音频发送设备，提供音频接收设备是否支持超低延迟无线音频传输的确认信息；
宽带射频收发模块，在基带数据与协议处理器驱动下，配置为与音频发送设备建立基于高速物理层的连接等时流连接，通过该连接,从音频发送设备接收第一音频数据。
基带数据与协议处理器，至少根据低功耗蓝牙协议连接等时流协议，驱动低功耗蓝牙射频收发模块，从音频接收设备接收第二音频数据；或，至少根据基于高速物理层的连接等时流协议，驱动宽带射频收发模块，从音频接收设备接收第一音频数据；
音频输出单元，可以对接收的音频数据进行解码、滤波、消噪、或均衡处理中的一种或多种。
在一个实施例中，该设备还可以包括，音频播放单元，将音频数据转化为音频信号，输出或播放所述音频信号。
根据一种具体的实施方式，一种超低延迟无线音频接收设备可以是音频接收与播放设备，包括提供BLE PHY的BLE射频收发模块，提供高速率PHY的宽带射频收发模块，基带数据与协议处理器，音频处理与输出单元。BLE射频收发模块用于音频接收与播放设备与音频发送设备建立BLE ACL连接和BLE CIS连接，传输LE Audio音频数据，以及协助建立采用高速率PHY的CIS连接。宽带射频收发模块用于音频接收与播放设备通过采用高速率PHY的CIS连接接收音频发送设备发送的高质量音频数据，如无压缩损失的音频数据或不编码的音频数据。基带数据与协议处理器用于执行BLE协议或BLE CIS协议，采用高速率PHY的CIS协议，BLE射频收发模块和宽带射频收发 模块的控制程序。音频处理与输出单元用于对音频数据做解码、滤波、消噪、或均衡等处理，并输出或播放音频信号。
从以上实施例可以看出，采用本发明实施例中公开的一种超低延迟无线音频发送和接收方法，及其相应的发送/接收设备，在低功耗蓝牙音频传输中采用了以无线局域网物理层为代表的高速物理层，作为可选的物理层来基于CIS传输规则传输无压缩损失、或不编码的音频数据，并采用自动跳频或动态频率配置方法抗WIFI干扰以稳定通信性能，提供了超低延迟、高音质且抗WIFI干扰的无线音频传输服务。
上述对本说明书特定实施例进行了描述。其它实施例在所附权利要求书的范围内。在一些情况下，在权利要求书中记载的动作或步骤可以按照不同于实施例中的顺序来执行并且仍然可以实现期望的结果。另外，在附图中描绘的过程不一定要求示出的特定顺序或者连续顺序才能实现期望的结果。在某些实施方式中，多任务处理和并行处理也是可以的或者可能是有利的。
专业人员应该还可以进一步意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
结合本文中所公开的实施例描述的方法或算法的步骤可以用硬件、处理器执行的软件模块，或者二者的结合来实施。软件模块可以置于随机存储器(RAM)、内存、只读存储器(ROM)、电可编程ROM、电可擦除可编程ROM、寄存器、硬盘、可移动磁盘、CD-ROM、或技术领域内所公知的任意其它形式的存储介质中。
以上所述的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施方式而已，并不用于限定本发明的保护范围，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (21)

  1. 一种无线音频发送方法，所述发送为从音频发送设备向音频接收设备发送，所述方法由所述音频发送设备执行，其特征在于，所述方法包括：
    所述音频发送设备，建立与所述音频接收设备的基于高速物理层的连接等时流连接；所述高速物理层的最低数据传输速率高于低功耗蓝牙物理层的最高数据传输速率；
    所述音频发送设备通过所述基于高速物理层的连接等时流连接,向所述音频接收设备发送第一音频数据。
  2. 根据权利要求1所述的方法，其中，所述音频发送设备，建立与所述音频接收设备的基于高速物理层的连接等时流连接，包括：
    所述音频发送设备，基于低功耗蓝牙物理层建立与所述音频接收设备的低功耗蓝牙非同步连接，所述音频发送设备通过所述低功耗蓝牙非同步连接，与所述音频接收设备建立基于所述高速物理层的连接等时流连接。
  3. 根据权利要求2所述的方法，其中，还包括：所述音频发送设备通过所述低功耗蓝牙非同步连接,确认所述音频接收设备是否支持超低延迟无线音频传输；
    如果不支持，则所述音频发送设备通过所述低功耗蓝牙非同步连接，与所述音频接收设备建立基于低功耗蓝牙物理层的低功耗蓝牙连接等时流连接，通过该低功耗蓝牙连接等时流连接，向音频接收设备发送第二音频数据；或，所述音频发送设备通过所述低功耗蓝牙非同步连接，向音频接收设备发送第二音频数据；
    如果支持，则所述音频发送设备通过所述低功耗蓝牙非同步连接，与所述音频接收设备建立基于所述高速物理层的连接等时流连接。
  4. 根据权利要求3所述的方法，其中，所述确认音频接收设备是否支持超低延迟无线音频传输，包括，通过访问音频接收设备的一般属性配置服务，确认音频接收设备是否支持超低延迟无线音频传输；所述第二音频数据包括，经过编码的低功耗蓝牙音频数据；
    所述第一音频数据包括，无压缩损失的音频数据或不编码的音频数据。
  5. 根据权利要求1所述的方法，其中，所述高速物理层的数据传输速率不低于4Mbps。
  6. 根据权利要求5所述的方法，其中，所述高速物理层包括，无线局域网物理层、无线超宽带物理层或预定宽带物理层中任意一种。
  7. 根据权利要求6所述的方法，其中，所述高速物理层包括IEEE802.11n无线局域网物理层。
  8. 根据权利要求1至7中之一所述的方法，其中，将所述高速物理层工作的无线频段划分为N个不交叠的预定带宽的信道，基于预定的自动跳频规则，使一个等时间隔内的相邻两个子事件发送信号所使用的信道编号不同；所述N为大于1的正整数。
  9. 根据权利要求8所述的方法，其中，基于所述高速物理层的连接等时流连接的配置为，采用2.4GHz ISM频段、20MHz带宽，把2.4GHz ISM频段分为N个不交叠的20MHz带宽的信道，设置其信道编号分别为0～N-1，N为2或3；
    所述预定的自动跳频规则包括：在每个等时间隔内，第一次子事件E1发送使用的信道编号为连接等时流事件的序列号除以N的余数；所述第一次子事件E1之后的子事件Ex发送使用的信道编号为，E1发送使用的信道编号与该子事件Ex的序列号相加后再除以N的余数。
  10. 根据权利要求2至7中之一所述的方法，还包括，
    所述音频发送设备与所述音频接收设备，根据所述低功耗蓝牙非同步连接自适应跳频的信道映射表，选择其中覆盖有用信道最多的预定带宽的信道作为所述高速物理层的信道；以及，
    通过低功耗蓝牙非同步连接，更新所述高速物理层的信道。
  11. 根据权利要求1至7中之一所述的方法，其中，基于高速物理层的连接等时流连接的配置为，采用20MHz带宽，采用1.25ms或2.5ms的等时间隔，设置音频数据包与确认包之间的时间间隔为短帧间间隔，设置最小子事件距离等于所述短帧间间隔；
    所述无线音频发送方法还包括，
    音频发送设备发送采样率为48kHz、量化位数为16比特的不编码立体声 音频，等时间隔为2.5ms；发送的音频数据包大小为480字节，采用2.4GHzISM频段、20MHz带宽的IEEE802.11n物理层的调制编码集，调制编码集索引值为4，传输速率39Mbps，采用HT_GF格式，BCC_CODING编码方式，LONG_GI保护间隔，音频数据包的时间长度为136us；
    采用调制编码集索引值为1的确认包，确认单元时间长度为40us；
    最小子事件距离以及短帧间间隔为10us，子事件数为3，最大传输延迟为588us，音频处理延迟为412us，音频采样从截获到播放的最低延迟为3.5ms。
  12. 一种无线音频接收方法，所述接收为音频接收设备从音频发送设备接收，所述方法由所述音频接收设备执行，包括：
    所述音频接收设备，与所述音频发送设备建立基于高速物理层的连接等时流连接；所述高速物理层的最小数据传输速率高于低功耗蓝牙物理层的最高数据传输速率；
    所述音频接收设备通过所述基于高速物理层的连接等时流连接,从音频发送设备接收第一音频数据。
  13. 根据权利要求12所述的方法，其中，所述音频接收设备，与所述音频发送设备建立基于高速物理层的连接等时流连接，包括，
    所述音频接收设备，与所述音频发送设备基于低功耗蓝牙物理层建立低功耗蓝牙非同步连接；所述音频接收设备通过所述低功耗蓝牙非同步连接，与所述音频发送设备建立基于所述高速物理层的连接等时流连接。
  14. 根据权利要求13所述的方法，还包括:
    所述音频接收设备通过所述低功耗蓝牙非同步连接,向所述音频发送设备，提供所述音频接收设备是否支持超低延迟无线音频传输的确认信息；
    如果不支持，则所述音频接收设备，通过所述低功耗蓝牙非同步连接，与所述发送音频设备建立基于低功耗蓝牙物理层的低功耗蓝牙连接等时流连接，通过该低功耗蓝牙连接等时流连接，从音频发送设备接收第二音频数据；或，所述音频接收设备通过所述低功耗蓝牙非同步连接，从音频发送设备接收第二音频数据；
    如果支持，则所述音频接收设备通过所述低功耗蓝牙非同步连接，与所述音频发送设备建立基于所述高速物理层的连接等时流连接。
  15. 根据权利要求14所述的方法，其中，所述音频接收设备通过其一般属性配置服务，向所述音频发送设备，提供所述音频接收设备是否支持超低延迟无线音频传输的确认信息；
    所述第二音频数据包括，经过编码的低功耗蓝牙音频数据；
    所述第一音频数据包括，无压缩损失的音频数据或不编码的音频数据；
    所述高速物理层的数据传输速率不低于4Mbps。
  16. 一种无线音频发送设备，所述发送设备实现权利要求1-11中之一所述的方法，以及包括基带数据与协议处理器、宽带射频收发模块，其中：
    所述基带数据与协议处理器，被配置为驱动所述宽带射频收发模块与无线音频接收设备建立基于高速物理层的连接等时流连接，并通过该连接等时流连接，向无线音频接收设备发送第一音频数据。
  17. 如权利要求16所述的设备，其中，还包括低功耗蓝牙射频收发模块；
    所述基带数据与协议处理器，被配置为驱动所述低功耗蓝牙射频收发模块与无线音频接收设备建立基于低功耗蓝牙物理层的低功耗蓝牙非同步连接；
    所述基带数据与协议处理器通过所述低功耗蓝牙非同步连接，使所述宽带射频收发模块与无线音频接收设备建立基于高速物理层的连接等时流连接。
  18. 如权利要求17所述的设备，其中，
    所述基带数据与协议处理器还被配置为通过所述低功耗蓝牙非同步连接，确认无线音频接收设备是否支持超低延迟无线音频传输；
    在确认无线音频接收设备不支持超低延迟无线音频传输时，所述基带数据与协议处理器还被配置为通过所述低功耗蓝牙非同步连接，使所述低功耗蓝牙射频收发模块与无线音频接收设备建立基于低功耗蓝牙物理层的连接等时流连接，并通过该连接等时流连接向无线音频接收设备发送第二音频数据；或者所述基带数据与协议处理器被配置为通过所述低功耗蓝牙非同步连接向无线音频接收设备发送第二音频数据；
    在确认无线音频接收设备支持超低延迟无线音频传输时，所述基带数据与协议处理器驱动所述宽带射频收发模块，通过所述基于高速物理层的连接等时流连接，向无线音频接收设备发送所述第一音频数据。
  19. 一种无线音频接收设备，所述接收设备实现权利要求12-15之一所 述的方法，以及包括基带数据与协议处理器、宽带射频收发模块，其中：
    所述基带数据与协议处理器，被配置为驱动所述宽带射频收发模块与无线音频发送设备建立基于高速物理层的连接等时流连接，并通过所述连接等时流连接，接收来自无线音频发送设备的第一音频数据。
  20. 如权利要求19所述设备，还包括低功耗蓝牙射频收发模块；
    所述基带数据与协议处理器，被配置为驱动所述低功耗蓝牙射频收发模块与无线音频发送设备建立基于低功耗蓝牙物理层的低功耗蓝牙非同步连接；
    在所述基带数据与协议处理器的驱动下，所述低功耗蓝牙射频收发模块通过所述低功耗蓝牙非同步连接接收来自无线音频发送设备的第二音频数据；或者，所述低功耗蓝牙射频收发模块通过所述低功耗蓝牙非同步连接，使所述宽带射频收发模块与无线音频发送设备建立基于高速物理层的连接等时流连接，并通过所述基于高速物理层的连接等时流连接，接收来自无线音频发送设备的第一音频数据；或者所述低功耗蓝牙射频收发模块通过所述低功耗蓝牙非同步连接，与无线音频发送设备建立基于低功耗蓝牙物理层的连接等时流连接，并通过该连接等时流连接，接收来自无线音频发送设备的第二音频数据。
  21. 如权利要求20所述的设备，其中，所述基带数据与协议处理器被配置为，通过一般属性配置设置本设备是否支持超低延迟无线音频服务，并通过所述低功耗蓝牙非同步连接，向无线音频发送设备提供一般属性配置服务查询。
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