CN113453023A - System and method for adjusting code stream rate based on wireless channel signal-to-noise ratio - Google Patents
System and method for adjusting code stream rate based on wireless channel signal-to-noise ratio Download PDFInfo
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 abstract description 6
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/21—Server components or server architectures
- H04N21/218—Source of audio or video content, e.g. local disk arrays
- H04N21/2187—Live feed
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/24—Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
- H04N21/2402—Monitoring of the downstream path of the transmission network, e.g. bandwidth available
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/262—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists
- H04N21/26208—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists the scheduling operation being performed under constraints
- H04N21/26216—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists the scheduling operation being performed under constraints involving the channel capacity, e.g. network bandwidth
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
- H04N21/2662—Controlling the complexity of the video stream, e.g. by scaling the resolution or bitrate of the video stream based on the client capabilities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6131—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a mobile phone network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Computer Networks & Wireless Communication (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
The invention discloses a system and a method for adjusting code stream rate based on wireless channel signal-to-noise ratio, which are used by combining a video transmission base station, detect the received signal strength (RSRP) of the video transmission base station and the signal-to-noise ratio (SINR) of a wireless channel through a video transmitting terminal, calculate the adjustment method of the code stream rate of an encoder, and transmit video signals through a special wireless network, thereby ensuring the stability of the transmission of video live broadcast wireless signals, overcoming the defect that the traditional wireless transmission technology is easily influenced by environmental interference, and being suitable for application scenes with complex environments such as sports events, evening meetings, concert and the like.
Description
Technical Field
The invention relates to the technical field of live video, in particular to a system and a method for adjusting the code stream rate based on the signal-to-noise ratio of a wireless channel.
Background
In the live broadcast process of television video programs, the requirement on signal sources is very high, so that the conditions of mosaic, pause and frame loss cannot occur to ensure the stability of video transmission.
In recent years, with the development of communication technology, more and more new technologies are applied to the field of broadcasting and television, and in order to enrich the pictures of programs and improve the audience rating of television stations, more and more wireless stations are adopted to transmit video signals.
The traditional wireless transmission technology, no matter microwave, or public network 4G network, is susceptible to environmental interference to affect the stability of video transmission. If people shelter from, building shelter from, personnel intensive live broadcast place, such as sports event, evening party, concert etc., the code stream rate of transmission is basically unadjustable, and the quality and stability of video transmission are influenced easily by the change of environment, so a new wireless transmission method is needed, which can satisfy the complex transmission environment and ensure the stability of video transmission.
Disclosure of Invention
The invention provides a system and a method for adjusting the code stream rate based on the signal-to-noise ratio of a wireless channel, which overcome the defects of the prior art that the transmission stability of the video live broadcast wireless signal is ensured, the traditional wireless transmission technology is easily influenced by the environmental interference, and the system and the method are suitable for application scenes with complex environments, such as sports events, evening meetings, concerts and the like.
In order to solve the technical problems, the invention adopts the following technical scheme:
a system for regulating code stream rate based on signal-to-noise ratio of wireless channel is composed of video transmission base station, video transmitting terminal and video-audio decoder connected to said base station
The video transmitting terminal acquires video and audio signals, performs video and audio coding, encodes and debugs signals of an IP data stream, performs signal amplification through a power amplifier and transmits the signals to the video transmission base station;
and the video transmission base station restores the wireless video signal of the video transmitting terminal into an IP data stream after receiving the wireless video signal, and the IP data stream is restored into an SDI video and audio signal through the video and audio decoder and is transmitted outwards.
Preferably, the video transmitter further comprises a camera connected with the video transmitting terminal to send SDI audio and video signals to the video transmitting terminal.
Preferably, the device further comprises a monitor, and the IP data stream is restored into an SDI audio-video signal by the audio-video decoder and sent to the monitor for picture display and sound playing.
Preferably, the video transmission base station manages and coordinates the video transmission terminal after receiving the wireless video signal.
Preferably, the video transmitting terminal comprises a video and audio encoder, a CPE, a power supply battery, a power amplifier module and a transmitting antenna;
the video and audio encoder compresses and encodes SDI signals, converts high-definition video pictures into codes of low code streams and outputs the codes to the CPE;
and the CPE encodes and modulates the encoded IP data stream by a channel, outputs a radio frequency signal, amplifies the radio frequency signal by a power amplification module, outputs the radio frequency signal to the transmitting antenna, and finally sends the radio frequency signal to the wireless video transmission base station through the transmitting antenna.
When the video and audio encoder compresses and encodes SDI signals, converts high-definition video pictures into codes of low code streams and outputs the codes to the CPE, signals of different formats input by various cameras and SDI embedded audio input are automatically identified, and the code stream rate and the resolution of output video streams are set.
Preferably, the CPE module receives a signal sent by the video transmission base station, and analyzes the signal to obtain a reference signal received power value RSRP and a signal to interference plus noise ratio SINR of the system; and respectively comparing the RSRP value with the SINR value and the reference value, and adjusting the code rate speed by setting different code stream rate grades.
In order to solve the above technical problem, the present invention further provides a method for adjusting a code stream rate based on a wireless channel signal-to-noise ratio, which at least comprises the following steps:
s1: the method comprises the following steps that a video camera acquires SDI video and audio signals and sends the SDI video and audio signals to a video transmitting terminal for video and audio coding to obtain IP data streams;
s2: coding and debugging signals of the IP data stream, amplifying the signals through a power amplifier to obtain wireless video signals, and sending the wireless video signals to a video transmission base station through a transmitting antenna;
s3: the wireless video transmission base station receives the wireless video signal and restores the wireless video signal into an IP data stream;
s4: the audio and video decoding restores the IP data stream in the step S3 into a plurality of SDI signals and transmits the SDI signals outwards;
s5: the video transmitting terminal receives the signal sent by the video transmission base station and analyzes the signal to obtain a reference signal received power value RSRP and a signal-to-interference-plus-noise ratio (SINR) of a system; and respectively comparing the RSRP value with the SINR value and the reference value, and adjusting the code rate speed by setting different code stream rate grades.
Wherein, step S5 specifically includes:
the CPE in the video transmitting terminal detects that the RSRP is smaller than a fixed value, and if the SINR is larger than or equal to S1, the code stream rate of the video and the audio is set to be R1; if S2 is not more than SINR < S1, setting the code stream rate of the video and audio to be R2; if S3 is not more than SINR < S2, setting the code stream rate of the video and audio to be R3; if the SINR is less than S3, setting the code stream rate of the video and audio to be R4;
wherein S1, S2, S3 in the SINR represent a first threshold, a second threshold and a third threshold, respectively;
r1, R2, R3 and R4 respectively represent a first code stream rate, a second code stream rate, a third code stream rate and a fourth code stream rate.
If the CPE in the video transmitting terminal detects that the RSRP is larger than or equal to the fixed value, the code stream rate of the video and the audio is set to be R1.
Different from the prior art, the invention has the following beneficial effects:
the method is used in combination with a video transmission base station, detects the received signal strength (RSRP) of the video transmission base station and the signal-to-noise ratio (SINR) of a wireless channel through a video transmitting terminal, calculates the adjustment method of the code stream rate of the encoder, transmits the video signal through a special wireless network, ensures the stability of the transmission of the video live broadcast wireless signal, overcomes the defect that the traditional wireless transmission technology is easily influenced by environmental interference, and is suitable for application scenes with complex environments such as sports events, evening parties, concerts and the like.
Drawings
FIG. 1 is a schematic block diagram of a system for adjusting a code stream rate based on a signal-to-noise ratio of a wireless channel according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a video transmitting terminal in an embodiment of the present invention;
fig. 3 is a schematic block diagram of a method for adjusting a code stream rate based on a signal-to-noise ratio of a wireless channel to achieve code stream rate adjustment in an embodiment of the present invention.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
As shown in fig. 1, a specific embodiment of the present invention provides a method for adjusting a bit stream rate based on a wireless channel signal-to-noise ratio in live video, where a system of the method is composed of a video transmission base station, a video transmitting terminal, and a video-audio decoder, and is used in combination with a monitor and a camera: the SDI video and audio signals of the camera are sent to a video transmitting terminal for video and audio coding, then the IP data stream is subjected to signal coding and debugging, and then the signals are amplified through a power amplifier and sent to a video transmission base station through a transmitting antenna; the video transmission base station receives the wireless video signal of the video transmitting terminal and restores the wireless video signal into an IP data stream, and meanwhile, the management and coordination of the video transmitting terminal are realized; the IP data stream is restored into SDI video and audio signals through a video and audio decoder and then is sent to a monitor for picture display and sound playing.
As shown in fig. 2, the video transmitting terminal in this embodiment includes a video-audio encoder, a CPE, a power supply battery, a power amplifier, and a transmitting antenna; the SDI signals shot by the camera are compressed and coded through a video-audio coder, so that high-definition video pictures are converted into low-code-stream codes to be output to CPE, signals with different formats input by various cameras can be automatically identified, SDI embedded audio input is supported, and parameters such as code stream rate, resolution and the like of output video streams can be set; the CPE realizes the coding and modulation of the channel of the coded IP data stream, outputs a radio frequency signal, amplifies the radio frequency signal through a power amplification module and transmits the signal through a transmitting antenna. Meanwhile, the video transmitting terminal can tap the value of the Signal to Interference plus Noise Ratio (Signal to Interference plus Noise Ratio) from the Signal transmitted by the wireless video transmission base station to the RSRP (Reference Signal Receiving Power) and the SINR (Reference Signal Receiving Power).
As shown in fig. 3, when a CPE in a video transmitting terminal detects that an RSRP value received from a video transmission base station is smaller than a certain fixed value, the value is assumed to be n (the value can be set by the video transmitting terminal), that is, when the RSRP is smaller than n, a function of adjusting the code stream rate for SINR is activated, and if the RSRP is greater than or equal to n, the adjusting function is not activated, and the default code stream rate is R1. It should be noted that the value of n should be set according to the actual usage, and cannot be set too large, if it is too large, it means that the video transmitting terminal is closer to the video transmission base station, and the received power is stronger, and if the SINR value changes too fast at this time, it is meaningless to adjust the code stream rate, because it should eliminate the external interference or change the frequency first.
In the case of RSRP < n, the following discussion is made:
if the SINR is larger than or equal to S1, setting the code stream rate of the video and audio to be R1;
if S2 is not more than SINR < S1, setting the code stream rate of the video and audio to be R2;
if S3 is not more than SINR < S2, setting the code stream rate of the video and audio to be R3;
if the SINR is less than S3, the code stream rate of the video and audio is set to be R4.
Wherein S1, S2, S3 in the SINR represent a first threshold, a second threshold and a third threshold, respectively; and
r1, R2, R3 and R4 respectively represent a first code stream rate, a second code stream rate, a third code stream rate and a fourth code stream rate, and all parameter values can be set through a video transmitting terminal, so that the video transmitting terminal is more flexible to use and can be suitable for more scenes.
In a specific embodiment, a preset fixed value of n = -95dBm, the three thresholds being S1=15, S2=10, S3=6, respectively; the values of the four code stream rates are: r1=4Mbps, R2=3Mbps, R3=2Mbps, R4=1 Mbps.
Namely, in case that the CPE detects the reference signal received power value RSRP < -95dBm of the system in the video transmitting terminal:
when the signal to interference plus noise ratio satisfies that the SINR is more than or equal to 15, setting the code stream rate of the video and audio to be 4 Mbps;
when the signal to interference plus noise ratio SINR meets the condition that the SINR is more than or equal to 10 and less than 15, setting the code stream rate of the video and audio to be 3 Mbps;
when the signal to interference plus noise ratio SINR meets the condition that the SINR is more than or equal to 6 and less than 10, setting the code stream rate of the video and audio to be 2 Mbps;
and when the signal to interference plus noise ratio SINR meets the SINR <6, setting the code stream rate of the video and audio to be 1 Mbps.
When the CPE in the video transmitting terminal detects that the reference signal receiving power value RSRP of the system is more than or equal to-95 dBm, the adjustment of the SINR is not needed to be started, and the code stream rate of the video and audio is set to be 4Mbps by default.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. A system for adjusting code stream rate based on wireless channel signal-to-noise ratio is characterized by comprising a video transmission base station, a video transmitting terminal and a video and audio decoder which are connected with the video transmission base station, wherein the video transmitting terminal and the video and audio decoder are connected with the video transmission base station
The video transmitting terminal acquires video and audio signals, performs video and audio coding, encodes and debugs signals of an IP data stream, performs signal amplification through a power amplifier and transmits the signals to the video transmission base station;
and the video transmission base station restores the wireless video signal of the video transmitting terminal into an IP data stream after receiving the wireless video signal, and the IP data stream is restored into an SDI video and audio signal through the video and audio decoder and is transmitted outwards.
2. The system according to claim 1, further comprising a camera coupled to the video transmitter terminal for sending SDI audio/video signals to the video transmitter terminal.
3. The system of claim 1, further comprising a monitor, wherein the IP data stream is processed by the video/audio decoder to recover SDI video/audio signal, and is sent to the monitor for displaying pictures and playing sound.
4. The system according to claim 1, wherein the video transmission base station manages and coordinates the video transmission terminals after receiving the wireless video signals.
5. The system for adjusting the bit stream rate based on the signal-to-noise ratio of the wireless channel according to any one of claims 1 to 4, wherein the video transmitting terminal comprises a video-audio encoder, a CPE, a power supply battery, a power amplifier module and a transmitting antenna;
the video and audio encoder compresses and encodes SDI signals, converts high-definition video pictures into codes of low code streams and outputs the codes to the CPE;
and the CPE encodes and modulates the encoded IP data stream by a channel, outputs a radio frequency signal, amplifies the radio frequency signal by a power amplification module, outputs the radio frequency signal to the transmitting antenna, and finally sends the radio frequency signal to the wireless video transmission base station through the transmitting antenna.
6. The system according to claim 5, wherein said video-audio encoder compresses and encodes SDI signals, converts high definition video pictures into low stream codes and outputs the low stream codes to said CPE, automatically recognizes different format signals from various cameras and SDI embedded audio inputs, and sets the stream rate and resolution of the output video stream.
7. The system for adjusting a bit stream rate based on a wireless channel signal-to-noise ratio according to claim 5, wherein the CPE module receives a signal sent by the video transmission base station and analyzes the signal to obtain a reference signal received power value RSRP and a signal-to-interference-plus-noise ratio SINR of the system; and respectively comparing the RSRP value with the SINR value and the reference value, and adjusting the code rate speed by setting different code stream rate grades.
8. A method for adjusting code stream rate based on wireless channel signal-to-noise ratio is characterized by at least comprising the following steps:
s1: the method comprises the following steps that a video camera acquires SDI video and audio signals and sends the SDI video and audio signals to a video transmitting terminal for video and audio coding to obtain IP data streams;
s2: coding and debugging signals of the IP data stream, amplifying the signals through a power amplifier to obtain wireless video signals, and sending the wireless video signals to a video transmission base station through a transmitting antenna;
s3: the wireless video transmission base station receives the wireless video signal and restores the wireless video signal into an IP data stream;
s4: the audio and video decoding restores the IP data stream in the step S3 into a plurality of SDI signals and transmits the SDI signals outwards;
s5: the video transmitting terminal receives the signal sent by the video transmission base station and analyzes the signal to obtain a reference signal received power value RSRP and a signal-to-interference-plus-noise ratio (SINR) of a system; and respectively comparing the RSRP value with the SINR value and the reference value, and adjusting the code rate speed by setting different code stream rate grades.
9. The method for adjusting a bit stream rate based on a signal-to-noise ratio of a wireless channel according to claim 8, wherein the step S5 specifically comprises:
the CPE in the video transmitting terminal detects that the RSRP is smaller than a fixed value, and if the SINR is larger than or equal to S1, the code stream rate of the video and the audio is set to be R1; if S2 is not more than SINR < S1, setting the code stream rate of the video and audio to be R2; if S3 is not more than SINR < S2, setting the code stream rate of the video and audio to be R3; if the SINR is less than S3, setting the code stream rate of the video and audio to be R4;
wherein S1, S2, S3 in the SINR represent a first threshold, a second threshold and a third threshold, respectively;
r1, R2, R3 and R4 respectively represent a first code stream rate, a second code stream rate, a third code stream rate and a fourth code stream rate.
10. The system according to claim 9, wherein if the CPE in the video transmitting terminal detects an RSRP greater than or equal to the fixed value, the video/audio streaming rate is set to R1.
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| CN202010212546.9A CN113453023A (en) | 2020-03-24 | 2020-03-24 | System and method for adjusting code stream rate based on wireless channel signal-to-noise ratio |
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| CN202010212546.9A CN113453023A (en) | 2020-03-24 | 2020-03-24 | System and method for adjusting code stream rate based on wireless channel signal-to-noise ratio |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20140045508A1 (en) * | 2012-08-07 | 2014-02-13 | Chandra Sekhar Bontu | Code rate adaptation in wireless communication systems |
| CN106803958A (en) * | 2017-01-12 | 2017-06-06 | 同济大学 | A kind of numerical model analysis video transmission method based on superposition modulated coding |
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| CN108769760A (en) * | 2018-05-23 | 2018-11-06 | 中国联合网络通信集团有限公司 | A kind of code rate adjustment method, UE, MEC and network system |
| CN211267010U (en) * | 2020-03-24 | 2020-08-14 | 福州市博讯网络科技有限公司 | System for adjusting code stream rate based on wireless channel signal-to-noise ratio |
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2020
- 2020-03-24 CN CN202010212546.9A patent/CN113453023A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140045508A1 (en) * | 2012-08-07 | 2014-02-13 | Chandra Sekhar Bontu | Code rate adaptation in wireless communication systems |
| CN106803958A (en) * | 2017-01-12 | 2017-06-06 | 同济大学 | A kind of numerical model analysis video transmission method based on superposition modulated coding |
| CN106804014A (en) * | 2017-02-20 | 2017-06-06 | 江苏省广播电视总台 | A kind of medium living broadcast method based on 4G wireless private networks |
| CN108769760A (en) * | 2018-05-23 | 2018-11-06 | 中国联合网络通信集团有限公司 | A kind of code rate adjustment method, UE, MEC and network system |
| CN211267010U (en) * | 2020-03-24 | 2020-08-14 | 福州市博讯网络科技有限公司 | System for adjusting code stream rate based on wireless channel signal-to-noise ratio |
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