CN115967783A - Method and circuit system for switching video receiving interface - Google Patents
Method and circuit system for switching video receiving interface Download PDFInfo
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Abstract
The specification provides a method and a circuit system for switching audio-video receiving interfaces, wherein the circuit system is arranged in a storage end device, a state and control data channel control module is arranged in a protocol layer circuit of each audio-video receiving interface, and when a plurality of audio-video receiving interfaces of the storage end device are connected with a plurality of audio-video sources, the state and control data channel control module continuously responds to information sent by the audio-video sources, so that the audio-video sources can continuously send fixed-rate link signals to the storage end device according to the response of the storage end device. The protocol layer circuit is provided with a fixed speed link video and audio packet detection module, and starts to detect the speed of the fixed speed link and then analyzes the video and audio packet to obtain video and audio data aiming at the video and audio receiving interface switched by the accumulating and storing end device.
Description
Technical Field
The specification provides a video and audio playing system, and more particularly, to a method and a circuit system for saving the time spent on playing video and audio after switching video and audio connection ports by modifying a firmware to avoid stopping the link training.
Background
In response to different Interface requirements of the consumer market, a Display often has multiple image receiving interfaces, for example, currently, a Display device is commonly provided with image receiving interfaces such as Display ports (HDMI) and High-Definition Multimedia interfaces (HDMI) in different numbers, so that a user can use the same Display to switch between different interfaces to receive image data of different interfaces; or a plurality of receiving ports are arranged in one interface, so that a user can switch different receiving ports to receive the image data of the same interface from different sources.
For example, fig. 1 is a schematic diagram of a conventional display architecture using a high-definition multimedia interface and a display port, wherein the operation process refers to a flowchart of switching an image receiving interface to establish an audio/video connection shown in fig. 2.
Fig. 1 shows a sink device (sink) 10, an electronic device such as a television or a screen (Monitor) for receiving and playing back video and audio contents, wherein the video receiving interface circuit is shown in the figure, the sink device 10 has two high definition multimedia interfaces, such as an HDMI Port a (111) and an HDMI Port B (112), and a Display Port (Display Port) 113, an HDMI Port a (111), an HDMI Port B (112) and a Display Port 113, which have respective power circuits in the sink device 10, such as power domains (power domains) 101, 102 and 103 shown in the figure, and the power domains 101, 102 and 103 are designed to be independent of the power domain of a main circuit (not shown in the figure) in the sink device 10.
In this example, the HDMI port a (111), the HDMI port B (112) and the display port 113 are respectively connected to the video source a (11), the video source B (12) and the video source C (13) through the video signal lines 121, 122 and 123, respectively, as shown in step S201 of fig. 2, the connection between each video receiving interface and the video source is established, and one of the video sources is switched and received according to the operation of the storage device 10 by the user. In this example, when the user is playing the video content received from the video source C (13) through the display port 113, as shown in step S203, the user plays the video content from one source (in this case, the video source C (13)), the two other video receiving interfaces have the following two situations.
One of the situations is that, in order to reduce the power consumption of the storage device 10, the main circuits of the power domains 101 and 102 can be powered off, so even if the video signal lines of each interface are wired, the power domains 101 and 102 cannot establish data transmission channels with the video source a (11) and the video source B (12) through Link Training (Link Training). At this time, because the Link training is not successful, the av source a (11) and the av source B (12) do not send a Fixed Rate Link (FRL) signal, as shown in step S205 in fig. 2, other av interfaces that are not playing cannot complete the HDMI Link training with the av source or cannot continuously respond to the polling of the av source, so that the av source stops sending the FRL signal until the user switches the currently connected and in-use display port 113 and its av signal line to the av source a (11) and the av source B (12).
When the user operates the storage-side device 10 to switch to receive the audio/video content from the audio/video source a (11) through the HDMI port a (111), as shown in step S207 in fig. 2, the storage-side device 10 turns on the power of the corresponding power domain 101, and then the hot plug switch (hot plug toggle) is used to restart the link training between the storage-side device 10 and the audio/video source a (11) to establish the data transmission channel, as shown in step S209 in fig. 2, the HDMI hot plug switch is started to restart the link training procedure, and step S211, the storage-side device 10 and the audio/video source a (11) start the link training, and after the link training is successful, as shown in step S213 in fig. 2, the audio/video content from the audio/video source a (11) can be played, as shown in step S215.
In another case, even when the HDMI-compliant audio/video content provided by the audio/video source a (11) or the audio/video source B (12) is not played, the sink device 10 keeps the power domains 101 and 102 powered on, so that when the HDMI cable (the audio/video signal lines 121 and 122) is connected to the audio/video source a (11) or the audio/video source B (12), the link training can be completed and the data transmission channel can be established. Thus, when the user wants to switch to one of the HDMI video sources, the video source a (11) or the video source B (12) does not need to restart the link training procedure through the hot plug toggle switch (hot plug toggle) as long as the switching is performed. But this case is to have power domains 101 and 102 fully powered up, increasing power consumption.
According to the above description of the conventional technology, when a user wants to switch and display images received by other av receiving interfaces from the currently played av content, the switching process needs to wait for the switched av receiving interface to reestablish the data transmission channel, so as to start receiving the image data. Such a situation may cause the user to have a bad experience of watching video and audio when switching between different video receiving interfaces.
Another embodiment is a schematic diagram of a conventional display circuit architecture using a high-definition multimedia interface as shown in FIG. 3.
The sink device 30 has a plurality of HDMI ports, such as HDMI port a (301) and HDMI port B (302), which are connected to the video source a (31) and video source B (32) through the video signal lines 331 and 332, respectively. Each HDMI interface includes a physical layer and a protocol layer, in which case the associated circuitry of HDMI port a (301) includes HDMI physical layer a (311) and HDMI protocol layer a (321), and the associated circuitry of HDMI port B (302) includes HDMI physical layer B (312) and HDMI protocol layer B (322). When the fixed rate link signal enters the HDMI interface, the corresponding physical layer converts the link signal into a digital signal, and then the protocol layer decodes the image data, so when the storage device 30 has a plurality of HDMI interfaces, a plurality of HDMI protocol layers are required at the same time, and the HDMI protocol layers are complex high-speed signals, so the circuit area occupied by the circuits of the plurality of protocol layers is quite large.
Disclosure of Invention
In view of the delay problem caused by the need of reconstructing data transmission channel when switching different video receiving interfaces in a display in the prior art, the present disclosure provides a method and a circuit system for switching video receiving interfaces, which can save the image display time required by the user to be waited when switching the high-definition multimedia interfaces by modifying the operation mechanism of the Fixed Rate Link (FRL) defined by the high-definition multimedia interface (such as HDMI 2.1) of a specific version, and can be applied to the architecture in which a plurality of high-definition multimedia interfaces share a set of receiving circuit, thereby achieving the purpose of minimizing the circuit design.
According to the embodiment, the circuit system is a circuit system in a storage device, such as an audio/video processing chip, wherein each audio/video receiving interface is provided with a status and control data channel control module for communicating with an audio/video source through a status and control data channel and providing the audio/video source to poll information therein, and the main task is to enable a plurality of audio/video sources to judge that a plurality of corresponding audio/video receiving interfaces in the storage device are in continuous operation; a fixed rate link video packet detection module reconstructs the fixed rate link by signal detection, transmission rate determination of the fixed rate link, and packet determination of the fixed rate link.
In the method, when a plurality of audio-video sources are connected with a plurality of audio-video receiving interfaces in the accumulating end device, each audio-video receiving interface continuously responds to a state and control data channel communication requirement sent by the corresponding audio-video source to the accumulating end device through a state and control data channel control module, and then each audio-video source can continuously send a fixed-rate link signal to the accumulating end device according to the continuous response of the state and control data channel control module. Therefore, when the accumulating end device is switched to one of the video receiving interfaces, the video packet detection module of the fixed speed link can start to detect the transmission speed and the packets of the fixed speed link, so that the accumulating end device can obtain the video data from one of the video sources connected with the video receiving interfaces according to speed information.
Preferably, the information continuously obtained by the plurality of video sources through the corresponding status and control data channel control module includes one or more check points set by the storage device in the status and control data channel control module.
Furthermore, the multiple video receiving interfaces in the storage end device share a video interface protocol layer through a switching circuit besides being respectively connected with a video interface physical layer and a state and control data channel control module.
Furthermore, when the accumulating end device is switched to one of the audio and video receiving interfaces, other audio and video sources which are not playing continuously respond to the communication requirement of the state and control data channel sent by each audio and video source through the state and control data channel control module, and each audio and video source continuously sends out a fixed-rate link signal according to the continuous response of the accumulating end device, so that the accumulating end device and each audio and video source complete link training.
After the audio-video packet is analyzed to obtain the transmission rate, the circuit system resets the parameters of the audio-video receiving interface and the audio-video interface physical layer in the storage device so as to obtain the audio-video data through the fixed rate link.
For a better understanding of the features and technical content of the present invention, reference is made to the following detailed description of the invention and to the accompanying drawings, which are provided for purposes of illustration and description only and are not intended to be limiting.
Drawings
FIG. 1 is a diagram of a conventional display architecture employing a high definition multimedia interface and a display port;
FIG. 2 is a flow chart showing a conventional method for switching image receiving interfaces to establish an audio/video connection;
FIG. 3 is a schematic diagram of a conventional circuit architecture for a display using a high definition multimedia interface;
FIG. 4 is a flowchart of an embodiment of a method for switching an AV receiving interface;
FIG. 5 is a block diagram of an embodiment of a circuit system for implementing a method for switching an AV receiving interface; and
fig. 6 shows a flow diagram of an embodiment of fixed rate link training.
Detailed Description
The following is a description of embodiments of the present invention with reference to specific embodiments, and those skilled in the art will understand the advantages and effects of the present invention from the disclosure of the present specification. The invention is capable of other and different embodiments and its several details are capable of modifications and various changes in detail without departing from the spirit and scope of the present invention. The drawings of the present invention are for illustrative purposes only and are not intended to be drawn to scale. The following embodiments will further explain the related art of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are used primarily to distinguish one element from another, or from one signal to another. Additionally, the term "or" as used herein is intended to include any one or combination of the associated listed items, as the case may be.
The disclosure provides a method and a circuit system for switching an audio/video receiving interface, which can effectively save the image display time when a user switches the audio/video receiving interface by modifying the circuit and the operation method thereof, and can be applied to a structure that a plurality of High Definition Multimedia Interface (HDMI) interfaces share one set of receiving circuit, thereby achieving the purpose of minimizing the circuit design. The method can be suitable for the operation of a Fixed Rate Link (FRL) interface under the HDMI2.1 version.
According to the embodiments of the disclosure, the architecture of a set of receiving circuits for multiple high-definition multimedia interface (HDMI) interfaces can refer to the circuit block embodiment shown in fig. 5, wherein the technical key is the flow chart of the embodiment of the method for switching the HDMI interface shown in fig. 4, and a circuit module 40 is disposed in the circuit system of the sink device (sink), especially in the related circuits of the HDMI interface, thereby operating the method for switching the HDMI interface. According to one embodiment, the circuit module 40 for operating the method may include a Status and Control Data Channel (SCDC) control module 41 and a Fixed Rate Link (FRL) video packet detection module 42 implemented in circuitry, firmware or software.
It is mentioned here that the Fixed Rate Link (FRL) is applied, according to one embodiment, the fixed rate of the fixed rate link is five, such as: 3/6/8/10/12GHz, each AV receive interface has a Status and Control Data Channel (SCDC), because each AV source may use different fixed rates, and therefore status and control data channels of different AV receive interfaces are not shared. In the method provided by the disclosure, the accumulating end device continuously responds to the audio/video source to continuously send out the fixed rate link signal, so that when the user switches to a specific audio/video source, the user can play audio/video by detecting the fixed rate link signal and analyzing the audio/video packet.
According to the embodiment, in order to realize the method for switching the video receiving interface provided by the disclosure, the circuit system in the storage device is modified, and the firmware of the state and control data channel control module is modified to provide the corresponding video source continuous polling (polling) information, so that the video source judges that the corresponding video receiving interface in the storage device is in continuous operation, and then the information (such as an FRL signal) is continuously sent to the storage device, so that when the video receiving interface is switched, a Fixed Rate Link (FRL) signal can be directly detected, further the video data can be received, and the time spent in switching the video receiving interface is successfully reduced.
When an audio/video signal line is used to connect the HDMI interface and the audio/video source (source) in the sink device, such as a network audio/video platform, the sink device status and control data channel control module 41 communicates with the audio/video source through a Status and Control Data Channel (SCDC), and starts the fixed rate link training (FRL link training) mechanism after handshaking. In the link training procedure, the accumulator device has one or more check points (such as LTP and GAP signals shown in fig. 6) that need to determine whether the fixed rate link signal sent by the video source is correct, and the accumulator device unconditionally replies the correct video source (source pass) information at this time, so that the link training procedure can complete the process, and the video source sends the fixed rate link signal, for example, the flow chart of the fixed rate link training embodiment shown in fig. 6. In the process, the accumulator device continuously responds to the state provided by the video source and the communication request of a control data channel (SCDC), so that the video source can continuously send out a fixed-rate link signal, and the accumulator device continuously receives video data. It is mentioned here that the status in the circuit module 40 and the status processed by the control data channel control module 41 communicate with the control data channel as a low speed signal, so that the power consumption added for maintaining the status and the operation of the control data channel is very small.
When a user operates the remote controller to control the accumulating end device and switches from an originally played interface to an HDMI interface to receive related audio/video data, because an audio/video source has continuously sent a fixed rate link signal, the fixed rate link audio/video packet detection module 42 can identify the signal in the energy-saving mode of the related audio/video processing chip on line, such as a Gap packet (Gap packet), and the fixed rate link audio/video packet detection module 42 is also a low power consumption mechanism, reconstructs the fixed rate link through the steps of signal detection, transmission rate judgment of the fixed rate link, fixed rate link packet judgment and the like, and starts to play an image after receiving the image data.
According to the flow chart of the embodiment of the method for switching the av receiving interfaces shown in fig. 4, at first, in step S401, a plurality of av receiving interfaces of the storage device are established to be connected to a plurality of av sources, then in step S403, the user controls the storage device to play the av contents of one source through the remote controller, at this time, in step S405, other av sources not being played by the user can continuously respond to the Status and Control Data Channel (SCDC) communication request sent by the av source through the Status and Control Data Channel (SCDC) control module 41, that is, continuously respond to the polling of the av sources, so that the av sources can continuously send out a Fixed Rate Link (FRL) signal according to the continuous response of the storage device, so that the storage device and the av sources complete link training.
Until the user wants to switch the video receiving interface in step S407, in step S409, the video packet detection module 42 of the circuit module 40 starts to detect the transmission rate of the fixed rate link, and the received storage device analyzes the video packet, and after analyzing the packet, the transmission rate in the video data or the information such as video resolution can be obtained. In the accumulating device, the HDMI receiver resets the parameters of the AV receiving interface circuit according to the determined transmission rate of the fixed rate link, so as to successfully convert the signal on the fixed rate link into a signal capable of being analyzed by the HDMI receiver. Thus, both ends can transmit and receive data according to the speed information, and one of the video and audio sources of the switched video and audio receiving interface connection transmits the image data through the fixed speed link; in the storage device, the audio/video data is obtained from the audio/video source connected to the switched audio/video receiving interface according to the obtained rate information, and then, in step S411, the audio/video content is played after the audio/video data is decoded.
It should be noted that, in the process shown in fig. 4, in order to save the time consumed by the accumulator device restarting the link training to establish the data transmission channel through the hot-plug switch and the video source when the user switches the HDMI video source, the circuit system of the method is operated such that when the HDMI video/audio signal line is connected to the video source and the accumulator device, the status and control data channel control module 41 is used to make the video source continuously send out a Fixed Rate Link (FRL) signal, until the user switches to the HDMI video source, the fixed rate link signal is detected by the fixed rate link video packet detection module 42, and the video data is received and the video content is played, and the process of switching the video receiving interface does not need to restart the link training process through the conventional hot-plug switch.
According to the embodiment of the method for switching the video receiving interface shown in fig. 4, the time for the audio/video source to restart the link training to establish the data transmission channel through the hot-plug switch by the storage device can be saved, and how much time is saved, depending on how long the audio/video source needs to restart the link training after receiving the hot-plug switch.
Referring to the block diagram of fig. 5, a circuit system for implementing the method for switching the av receiving interface is shown.
The figure shows an accumulator device 50 that uses the same circuit to support multiple video/audio receiving interfaces, such as HDMI interface, and related circuits can be HDMI for example, and each video/audio receiving interface is connected to its own processing circuit. The video interface is shown as a video receiving interface a (501) and a video receiving interface B (502), in one embodiment, the circuit modules including the status and control data channel control module 41 and the fixed rate link video packet detection module 42 are respectively disposed therein, for example, the circuit module 40a and the circuit module 40B are respectively disposed in the circuits of each video receiving interface. In addition, the av receiving interface a (501) and the av receiving interface B (502) are connected to the circuits of the shared communication protocol layer, such as the av interface protocol layer 520 shown in the figure, through a switching circuit 521 (such as a multiplexer), in addition to the respective connected circuits of the av interface physical layer a (511) and the av interface physical layer B (512). In one embodiment, the video receiving interface a (501) and the video receiving interface B (502) are respectively configured with the circuit modules as set forth in the embodiment of fig. 4, and respectively configured with the status and control data channel control module (fig. 4, 41) and the fixed rate link video packet detection module (fig. 4, 42). The status and control data channel control module receives the minimum operating current supplied by a power circuit (not shown) in the circuit system, and can still provide the information obtained by polling the video source when the storage end device closes the video receiving interface (such as closes the main current). The audio/video sink device 50 is connected to different audio/video sources, such as the audio/video source a (51) and the audio/video source B (52) shown in the figure, through the audio/video receiving interface a (501) and the audio/video receiving interface B (502) respectively through the audio/ video signal lines 531 and 532.
It is noted that when the user is playing the video source a (51), the video receiving interface a (501), the video interface physical layer a (511), the switching circuit 521, and the video interface protocol layer 520 must be powered on, and other circuits that are not being used, such as the video receiving interface B (502) and the video interface physical layer B (512), can be powered off. On the contrary, when the user switches from the video source a (51) to the video source B (52), the video receiving interface B (502) and the video interface physical layer B (512) must be powered, then the status and control data channel control module (fig. 4, 41) continuously communicates with the video source B (52), so the video source B (52) sends out a Fixed Rate Link (FRL) signal, and then the fixed rate link video packet detection module (fig. 4, 42) determines the transmission rate, and can reset the parameters of the video receiving interface B (502) and the video interface physical layer B (512), so as to obtain the video data sent by the video source B (52).
Thus, the operation of the status and control data channel control module can make the video source continuously send out a fixed speed link signal, for example, when the user plays the video content of the video source a, the video receiving interface B and the video interface physical layer B can be closed, when the circuit system receives the signal of switching the user to the HDMI video source B, the power supply is controlled to be supplied to the video receiving interface B and the video interface physical layer B, the fixed speed link signal from the video source is detected by the fixed speed link video packet detection module, and the video data is received, and the video interface protocol layer 520 is switched to the video interface physical layer B by the switching circuit 521, so that the same video interface protocol layer 520 can be used to receive the data of different video sources, and the purpose of minimizing the circuit design can be achieved.
In the method for switching an audio/video receiving interface disclosed in the disclosure, a Fixed Rate Link (FRL) training procedure is performed, the FRL procedure is applicable to a transmission mode defined by the HDMI2.1 specification, and a transmitter of an audio/video source and a receiver of a storage device must perform link training (link training) before entering the FRL mode, and the related procedures can refer to the flowchart shown in fig. 6.
When the audio/video source is connected to the audio/video source through the audio/video signal line, the audio/video source and the audio/video sink start a fixed rate link training procedure through the status and control data channel (step S601), and at the same time, the audio/video source and the audio/video sink communicate with each other through the status and control data channel to establish a handshake procedure (step S603).
In the process of link training, the accumulator device is provided with two check points to judge whether the incoming signal is correct, wherein the two check points comprise a link training pattern (link training pattern) packet and a gap pattern (gap pattern) packet, namely in a handshake procedure of a link training procedure between an audio-video source and the accumulator device, a circuit system in the accumulator device can appoint the audio-video source to send out a certain link training pattern to serve as the purpose of communication between two ends; the gap pattern package is used for comparing the signal quality of the fixed speed link between the video source and the accumulating end device.
In step S605, the av source sends out a link training pattern packet (LTP packet), and in step S607, the accumulator device confirms that the link training pattern packet is received, so as to determine whether the fixed rate link signal sent by the av source is correct, and the accumulator device unconditionally replies a correct (pass) check message from the av source at this time, so that the link training can be performed to confirm the maximum transmission bandwidth therebetween, and the av source continues to send out the fixed rate link signal.
Then, in step S609, before transmitting the image data, the av source transmits gap pattern packets (gap pattern packets) so that the av source can prepare the image data within the time, however, the transmission time of the gap pattern packets depends on the time for the av source to prepare the image data, and in order not to miss the image data, in step S611, the depositor device also unconditionally responds to the gap pattern packets to check the correct information, in step S613, through link training, thereby maintaining the state of the FRL link and waiting for the av source to transmit the image data. Finally, in step S615, the av source outputs a fixed rate link signal, and the storage device receives the av data according to the rate information thereof, and plays the av content accordingly.
In summary, according to the method flow for switching the video receiving interface and the circuit system for executing the method described in the above embodiments, the circuit system is designed as a circuit sharing a video interface protocol layer, and is provided with a status and control data channel control module, wherein the Link Training Pattern (LTP) check and the GAP pattern (GAP) check are unconditionally correct, so that each video source continuously sends a fixed rate link signal, which can quickly reflect the video content that a user wants to play, and then the fixed rate link video packet detection module is used to detect the transmission rate of the link signal to reset the HDMI interface and the physical layer parameters, thereby obtaining the video data, i.e. starting to play the video content. The design of the circuit system can save the protocol layer circuit and the used circuit area, and the plurality of video and audio receiving interfaces can be connected with a plurality of video and audio sources at different fixed rates.
The disclosure is only a preferred embodiment of the invention and should not be taken as limiting the scope of the invention, so that the invention is not limited by the disclosure of the specification and drawings.
[ notation ] to show
10 accumulating end device
101. 102, 103 power domain
111 hdmi port a
112, HDMI port B
113 display port
121. 122, 123 video/audio signal line
11 audio/video source A
12 audio and video source B
13 video and audio source C
30: accumulating end device
301 hdmi port a
302 hdmi port B
311, hdmi physical layer a
312 HDMI physical layer B
321, HDMI protocol layer A
322 hdmi protocol layer B
331. 332 video/audio signal line
31 video and audio source A
32 audio/video source B
Status and control data channel control module
42 fixed rate link video packet detection module
40: circuit module
50 accumulating end device
501 video and audio receiving interface A
502 audio-visual receiving interface B
511 video and audio interface physical layer A
512 audio/video interface physical layer B
520 audio/video interface protocol layer
521 switching circuit
531. 532 video signal line
51 Audio video Source A
52 audio/video source B
Step S201-S215 of switching the image receiving interface to establish the video/audio connection
Step S401-S411. The present invention provides a process for switching image receiving interface to establish video/audio connection
Step S601-S615 is a fixed rate link training process.
Claims (10)
1. A method for switching video receiving interface, executed in a circuit system, includes:
when a plurality of audio-video sources and a plurality of audio-video receiving interfaces in a storage end device are connected, a state and control data channel control module in the circuit system continuously responds to a state and control data channel communication requirement sent by the corresponding audio-video source to the storage end device;
continuously responding to the sent fixed speed link signals from the plurality of audio and video sources according to the status and control data channel control module; and
when the storage end device is switched to one of the video receiving interfaces, a fixed speed link video packet detection module in the circuit system starts to detect a fixed speed link signal sent by one of the video sources corresponding to the switched video receiving interface, and establishes a fixed speed link with the switched video receiving interface, so that the storage end device obtains video data from one of the video sources connected with the video receiving interface according to speed information.
2. The method of claim 1, wherein when the sink device is switched to one of the video receiving interfaces, other non-playing video sources continuously respond to the status and control data channel communication request from each video source through the status and control data channel control module, so that each video source continuously sends out a constant rate link signal according to the continuous response of the sink device, and the sink device and each video source complete link training.
3. The method of claim 1, wherein when detecting a fixed rate link signal from one of the video sources corresponding to the video receiving interface, parsing the video packet to obtain a transmission rate of the video data.
4. The method of claim 3, wherein after the transmission rate is obtained, the parameters of an AV receiving interface and an AV interface physical layer in the storage device are reset to obtain the AV data through a fixed rate link.
5. The method of any of claims 1-4, wherein the information that the multiple AV sources continuously obtain through the corresponding status and control data channel control module comprises one or more check points that the storage device sets in the status and control data channel control module.
6. The method of claim 5, wherein the checking point comprises a link training pattern packet and a gap pattern packet.
7. The method of claim 5, wherein the accumulator device unconditionally replies correct information from the video sources, so that the link training can be completed and the video sources continue to send out fixed rate link signals.
8. A circuit system applied in a storage terminal device comprises:
a state and control data channel control module, which communicates with the corresponding video and audio source through a state and control data channel and provides the corresponding video and audio source polling information to make the video and audio sources judge that the corresponding video and audio receiving interfaces in the accumulating and storing end device are in continuous operation;
a fixed rate link video packet detection module, which reconstructs a fixed rate link through signal detection, transmission rate judgment of the fixed rate link and fixed rate link packet judgment;
the method for the circuit system to execute a switching video and audio receiving interface comprises the following steps:
when a plurality of audio-video sources and a plurality of audio-video receiving interfaces in the accumulating end device are connected, continuously responding to a state and control data channel communication requirement sent to the accumulating end device by the corresponding audio-video source through the state and control data channel control module;
continuously responding to the sent fixed-rate link signals from the plurality of audio-video sources according to the corresponding states and the control data channel control module; and
when the storage end device is switched to one of the video receiving interfaces, the fixed rate link video packet detection module detects a fixed rate link signal sent by one of the video sources corresponding to the switched video receiving interface and analyzes the fixed rate link signal to obtain a transmission rate, so that the storage end device establishes the fixed rate link with the switched video receiving interface, and the storage end device obtains video data from one of the video sources connected with the video receiving interface according to the transmission rate.
9. The circuit system of claim 8, wherein the plurality of video and audio receiving interfaces share the video and audio interface protocol layer through a switching circuit in addition to being connected to a video and audio interface physical layer respectively.
10. The circuit system of claim 9, wherein the physical layer of the video interface, the switching circuit and the common protocol layer of the video interface corresponding to the switched video receiving interface are powered on, and the other non-currently used video receiving interfaces and video interface physical layers are powered off.
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| CN202111170568.4A CN115967783A (en) | 2021-10-08 | 2021-10-08 | Method and circuit system for switching video receiving interface |
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| CN202111170568.4A Pending CN115967783A (en) | 2021-10-08 | 2021-10-08 | Method and circuit system for switching video receiving interface |
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| Country | Link |
|---|---|
| CN (1) | CN115967783A (en) |
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2021
- 2021-10-08 CN CN202111170568.4A patent/CN115967783A/en active Pending
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