CN210839594U

CN210839594U - Single-node time synchronization device

Info

Publication number: CN210839594U
Application number: CN201920905539.XU
Authority: CN
Inventors: 杨敏
Original assignee: Jiangsu Jushu Intelligent Technology Co ltd
Current assignee: Jiangsu Jushu Intelligent Technology Co ltd
Priority date: 2019-06-17
Filing date: 2019-06-17
Publication date: 2020-06-23
Anticipated expiration: 2029-06-17

Abstract

The utility model relates to a time synchronizer field indicates a time synchronizer of single node especially. The main processor is respectively connected with the wireless communication module and the audio data processor with the filtering function through the main processor; the audio data processor is respectively connected with the memory and the digital-to-analog conversion module; the digital-to-analog conversion module is also connected with the loudspeaker; when the audio is transmitted in the wireless network, the delay of the clocks of different nodes can be ensured within the range which can not be distinguished by human ears, so that the problem that the clocks of the different nodes are not synchronous when the audio is transmitted in the wireless network is solved.

Description

Single-node time synchronization device

Technical Field

The utility model relates to a time synchronizer field indicates a time synchronizer of single node especially.

Background

The size of the buffer area of audio data of different nodes in a local area network for multi-channel audio transmission directly influences the effect of audio synchronous playing, and the clock synchronization delay is more serious due to the conditions of large wireless network delay, packet loss and the like; the problem of insufficient data can be relieved by specially increasing the size of the buffer area, but the cost is increased, more time is spent when part of data needs to be discarded, new delay is generated, and the problem that the incoming data cannot be stored when the buffer area is filled due to too small buffer area is solved; to solve this problem, a high-speed and efficient time compensation method is provided for the audio data in the buffer to be efficiently operated.

At present, the multi-channel audio data transmitted by the existing household wireless network is widely applied to audio equipment of smart homes, and both the collected audio data and the played audio file need to be processed and responded quickly and timely; particularly, with the rapid development of artificial intelligence voice interaction equipment, it has become possible that a common family can deploy a voice interaction system in any room of the family by using a wireless technology, and the development of a multi-room wireless audio transmission technology is increasing day by day; the sound is enabled to be ubiquitous as a main function of the existing voice system, wherein a plurality of audio nodes need to be capable of processing high-quality digital audio data at high speed and effectively, and especially, playing audio synchronously has important significance on a multi-channel sound source, which is an important technical basis of a future intelligent voice interaction system and a virtual reality technology.

Since Wi-Fi is the mainstream local area network wireless communication network at present, many audio transmission methods are based on the Wi-Fi network; human hearing sensitivity is very high, and if serious delay or asynchronism exists in audio transmission, ears can be immediately distinguished, so that the actual use effect of transmitting audio in a wireless mode is greatly influenced; the important basis of audio synchronization is the synchronization of audio data time, that is, the time of audio playing at different nodes in the network is as consistent as possible, and on the premise that the buffered data are in the buffer area, whether audio playing can be started from the same time point is an important technical index for whether audio can be synchronized; perfect agreement is very difficult, but controlling the time difference to be within the time range that the human ear can resolve can solve this problem;

the existing wireless network synchronization technology aims at improving the audio frequency clock synchronization accuracy of each node, only clock synchronization is not enough, the function characteristics of each node are considered while the clock synchronization is met, and on the premise that a hardware system is determined, the function characteristics of the hardware are fully utilized and mined, and more performance space can be released by combining the characteristics of a digital audio file; the prior art has the following defects: (1) the traditional DMA mode: the traditional DMA mode, namely the direct memory access mode, only releases the control right of CPU occupation, although the data transmission speed from the external equipment to the memory is accelerated, the requirement of synchronous audio playing of each node in the local area network cannot be solved; (2) the processing of multi-channel data is not fine enough: with the development of object-oriented audio acquisition technology, the traditional 5.1 channel and 7.1 channel cannot meet the transmission and storage of more channel audio data, more channels 24 and 32 channels have been applied to virtual reality applications, if all channel data are processed in the same buffer, the memory of the traditional hardware cannot meet the space requirement, and even if the space requirement is met, a series of problems such as cost rise and long processing time are caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a when wireless network transmission audio frequency, can ensure the delay of different node clocks at the unable within range of distinguishing of people's ear to solve the audio frequency and transmit the asynchronous problem of different node clocks at wireless network.

The technical scheme of the utility model as follows: the single-node time synchronization device is characterized by comprising a main processor, a time synchronization module and a time synchronization module, wherein the main processor is respectively connected with a wireless communication module and an audio data processor with a filtering function; the audio data processor is respectively connected with the memory and the digital-to-analog conversion module; the digital-to-analog conversion module is also connected with the loudspeaker.

The audio data processor is formed by connecting an audio data multiplexing module and a DMA controller.

The wireless communication module comprises a WIFI module or a wireless communication module.

The utility model has the advantages that: 1. the multi-node synchronous processing capacity of the audio data is improved by using a DMA (direct memory access) technology and combining a time synchronization mechanism algorithm;

2. and the DMA technology is utilized to realize the redundant processing of the multi-node audio data, and the capacity of processing the multi-channel audio data is improved on the premise of not changing the hardware cost.

3. The high-precision synchronization unit is combined with the DMA controller, so that the time of single-node data processing is greatly shortened.

4. The audio data demultiplexing is combined with the DMA, and unnecessary audio channels are filtered, so that the consumption of space is greatly reduced.

Drawings

The foregoing and other objects, features, and advantages of the invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings.

Wherein: fig. 1 is a schematic structural diagram of an audio system according to the present invention;

FIG. 2 is a schematic view of a single node structure of the present invention;

fig. 3 is a schematic diagram of an audio queue according to the present invention;

FIG. 4 is a schematic structural view of the present invention;

in the drawing, 101 is an audio data transmitting node, 102 is an audio data receiving node, 201 is a high-precision clock synchronizing unit, 205 is an audio data queue, 301 is a time stamp, 302 is an audio data packet, 401 is a wireless communication module, 402 is a main processor, 403 is a memory, 404 is an audio data demultiplexing module, 405 is an audio data processor, 406 is a digital-to-analog conversion module, and 407 is a loudspeaker.

Detailed Description

Referring to fig. 1, a time synchronization apparatus of a single node includes a main processor 402, which is connected to a wireless communication module 401 and an audio data processor 405 with a filtering function, respectively; the audio data processor is respectively connected with a memory 403 and a digital-to-analog conversion module 406; the digital-to-analog conversion module is also connected with a loudspeaker 407. As shown in fig. 4, the wireless communication module 401 receives channel information, such as a channel n, that a current node needs to play; the information is notified to the main processor 402, the main processor transmits the channel information to the audio data processor with filtering function, the audio data stored in the audio data queue of the memory 403 is multi-channel multiplexing data, under the intervention of the audio data processor with filtering function, only the data of the corresponding channel n is required to be transmitted to the digital-to-analog converter 406, and then the sound of the channel n is played through the loudspeaker 407; the data is filtered, so that the aim of only reserving the required data channel is fulfilled.

The audio data processor is formed by connecting an audio data multiplexing module and a DMA controller. As shown in fig. 4, in the multi-channel audio processing system, a WiFi module 401 receives channel information, such as a channel n, that a current node needs to play; the information is notified to the main processor 402, the main processor transmits the channel information to the audio data demultiplexing processor 404, the audio data stored in the audio data queue of the memory 403 is multi-channel multiplexed data, under the intervention of the audio data demultiplexing processor, the DMA controller 405 only needs to transmit the data of the corresponding channel n to the digital-to-analog converter 406, and then further plays the sound of the channel n through the loudspeaker 407; thus, the audio data demultiplexing and the audio data processor are combined to form a special audio data processor with filtering function, thereby realizing the purpose of only reserving the required data channel.

The wireless communication module comprises a WIFI module or a wireless communication module. And the wireless communication module is adopted, so that the communication is convenient and the application range is wide.

The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the techniques of the present invention are substantially any simple modification and equivalent changes to the above embodiments, all falling within the protection scope of the present invention.

Claims

1. The single-node time synchronization device is characterized by comprising a main processor, a time synchronization module and a time synchronization module, wherein the main processor is respectively connected with a wireless communication module and an audio data processor with a filtering function; the audio data processor is respectively connected with the memory and the digital-to-analog conversion module; the digital-to-analog conversion module is also connected with the loudspeaker.

2. The time synchronizer of claim 1, wherein said audio data processor is comprised of an audio data interface multiplexing module and a DMA controller.

3. The single-node time synchronizer of claim 1, wherein said wireless communication module comprises a WIFI module or a wireless communication module.