Signal processing method and related relay device

Abstract

The invention discloses a signal processing method, which comprises the following steps of: receiving an MST packet conforming to a DP specification; converting the MST packet into a plurality of SST packets; determining the number of valid data symbols in a transmission unit included in the plurality of SST packets according to horizontal blank gap information represented by the MST packet or the plurality of SST packets; and transmitting the plurality of SST packets to a backend device.

Description

Technical Field

[0001] The invention relates to a method for processing a display interface (DisplayPort, DP) signal. Background Art

[0002] The image generating device can have two modes when generating DP signals, one of which is the Single Stream Transport (SST) mode, and the other is the Multi-Stream Transport (MST) mode. In the MST mode, its MST packet has 64 time slots for data transmission, and the image generating device will assign the time slots according to the bandwidth of the data to be transmitted. For example, only time slots #1 to #5 in the MST packet can be used to carry valid data of one stream, and the remaining time slots are used to carry valid data of other streams or no data. Therefore, in the case where only part of the time slots are used to carry the data of the stream, since the data of the stream needs to wait until the allocated time slot to be transmitted, it will cause jitter, and it may also cause the size of the horizontal blanking interval of the image data to be unstable, causing trouble for the back-end device during processing. Summary of the invention

[0003] Therefore, one of the objectives of the present invention is to provide a signal processing method, which can process the size of the horizontal blanking gap in the MST grouping generated by the image generating device to solve the problems described in the prior art.

[0004] In one embodiment of the present invention, a signal processing method is disclosed, which includes the following steps: receiving an MST packet that complies with the DP specification; converting the MST packet into multiple SST packets; determining the number of valid data symbols in a transfer unit (TU) included in the multiple SST packets based on horizontal blank gap information represented by the MST packet or the multiple SST packets; and transmitting the multiple SST packets to a backend device.

[0005] In one embodiment of the present invention, a relay device is disclosed, which includes a receiving circuit, a processing circuit and a transmitting circuit. The receiving circuit is used to receive an MST packet that complies with the DP specification. The processing circuit is coupled to the receiving circuit and is used to convert the MST packet into a plurality of SST packets, and determine the number of valid data symbols in the transfer unit (TU) included in the plurality of SST packets according to the horizontal blanking information represented by the MST packet or the plurality of SST packets. The transmitting circuit transmits the plurality of SST packets to a backend device.

[0006] In one embodiment of the present invention, a signal processing method is disclosed, which includes the following steps: receiving an extended display capability identification (EDID) from a back-end device; adjusting the size of the horizontal blank gap included in the EDID to generate an adjusted EDID; and transmitting the adjusted EDID to an image generating device for generating an MST grouping that complies with DP specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a schematic diagram of a system according to an embodiment of the present invention.

[0008] Figure 2 It is a schematic diagram of a data stream generated by an image stream generating circuit according to an embodiment of the present invention, part of the signal content of the link layer in a DP format conversion circuit, and the time slot configuration corresponding to the MST grouping.

[0009] Figure 3 is a schematic diagram of a transmission unit.

[0010] Figure 4 It is a schematic diagram of increasing the number of valid data symbols in a transmission unit.

[0011] Figure 5 is a flowchart of a signal processing method according to an embodiment of the present invention.

[0012] Figure 6 is a schematic diagram of a system according to another embodiment of the present invention.

[0013] Figure 7 It is a schematic diagram of increasing the horizontal blanking gap output by the image generating circuit by adjusting the EDID according to an embodiment of the present invention.

[0014] Figure 8 is a flowchart of a signal processing method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0015] Figure 1 1 is a schematic diagram of a system 100 according to an embodiment of the present invention. Figure 1As shown, the system 100 includes an image generating device 110, a relay device 120, and a backend device 130, wherein the image generating device 110 includes an image stream generating circuit 112, a DP format conversion circuit 114, an MST packet generating circuit 116, and a transmitting circuit 118; and the relay device 120 includes a receiving circuit 122, a processing circuit 123, and a transmitting circuit 124. In this embodiment, the image generating device 110 can be a graphics processing unit (GPU) or any circuit or device that can generate an MST packet that complies with the DP specification; the relay device 120 can be a branch device, a converter / translator, or any other circuit or device that can convert an MST packet that complies with the DP specification into an SST packet; and the backend device 130 can be any display or display panel that can receive the SST packet from the relay device 120 and process the SST packet for image display.

[0016] In the operation of the image generating device 110, the image stream generating circuit 112 is used to generate an image stream, wherein the image stream complies with the Video Electronics Standards Association (VESA) specification. Then, the DP format conversion circuit 114 performs format conversion on the image stream to generate an SST packet that complies with the DP specification, and the MST packet generating circuit 116 performs time slot scheduling on the SST packet to generate an MST packet, and the MST packet is transmitted to the relay device 120 via the transmission circuit 118.

[0017] Figure 2 FIG. 1 is a schematic diagram of the data stream generated by the video stream generating circuit 112 and part of the signal content of the link layer in the DP format converting circuit 114, as well as the time slot configuration corresponding to the MST packet. Figure 2As shown, the data stream generated by the image stream generating circuit 112 includes a blank area and a valid area, wherein the low level of the icon indicates the blank area, and the high level indicates the valid area. The output signal of the link layer includes the blanking start (Blanking Start, BS), the blanking end (Blanking End, BE) and the data therein. For example, the horizontal blanking gap is from the start of BS to the next BE, and the gap may include filling data, secondary data, etc.; the gap from the start of BE to the next BS is the valid area, and the gap from the start of BE to the next BS includes filling data and valid display data, etc. In the MST group time slot configuration, this embodiment assumes that only 32 time slots among the 64 time slots included in an MST group can be used to transmit the image stream, and the 32 time slots that can be used to transmit the image stream (for example, the 1st to 32nd time slots) are represented by a high level in the diagram, while the 32 time slots that cannot be used to transmit the image stream (for example, the 33rd to 64th time slots) are represented by a low level in the diagram. Figure 2 As shown in FIG. 1 , since the time point at which the BS is generated at the link layer may correspond to the 33rd to 64th time slots in the MST packet that cannot be used to transmit the image stream, there will be a delay time from the start of the BS to the horizontal blanking interval data of the next BE. In addition, Figure 2 As shown in the horizontal blanking gap from the second BS to the second BE, since the time point when the BS is generated at the link layer corresponds to the 1st to 32nd time slots in the MST group that can be used to transmit the image stream, and the time point when the BE is generated at the link layer also corresponds to the 1st to 32nd time slots in the MST group that can be used to transmit the image stream, and the time when the BS and BE are configured to the MST group will change due to the delay of the previous data, the horizontal blanking gap from the BS to the next BE in the MST group will also be different; in this embodiment, the BS has a larger delay when configured to the MST group, and the BE has a smaller delay when configured to the MST group, so the horizontal blanking gap from the BS to the next BE in the MST group will become smaller.

[0018] like Figure 2 As shown, since only a part of the time slot of the MST packet can be used for the image stream, the size of the corresponding horizontal blanking gap in the MST packet will vary with the time point when the BS and BE are generated, for example Figure 2The first horizontal blanking gap in the MST packet will be larger (longer duration), while the second horizontal blanking gap in the MST packet will be smaller (shorter duration), even though each horizontal blanking gap generated by the link layer is the same. The above-mentioned problem of non-fixed length of horizontal blanking gaps will cause troubles in the processing of the back-end circuit, especially when the horizontal blanking gap is too small, the back-end circuit may not be able to decode the control symbol or secondary data carried in the horizontal blanking gap in real time, causing some auxiliary functions to fail, such as the back-end device 130 being unable to receive an audio signal.

[0019] To solve the above problem, this embodiment proposes adjusting the effective data volume of a transfer unit (TU) in the relay device 120 to prevent the backend device 130 from being unable to decode the control symbols or secondary data carried in the horizontal blanking interval in real time.

[0020] In the operation of the relay device 120, in the first embodiment, the receiving circuit 122 first receives the MST packet from the image generating device, and the processing circuit 123 converts the received MST packet into the format of the SST packet and determines the effective data volume of the transfer unit (TU) in the plurality of SST packets. Specifically, the processing circuit 123 can analyze the timing information in the process of converting the MST packet into the SST packet, for example, to determine Figure 2 The size of the horizontal blanking gap represented by the MST packet time slot configuration shown and / or the stream clock and other information are used to determine the effective data volume of the transmission unit in the SST packet, so that the generated SST packet can keep the size of the horizontal blanking gap within an appropriate range. Figure 3 FIG. 1 is a schematic diagram of a transmission unit shown in FIG. 1 , wherein the transmission unit may include 32 symbols or 64 symbols, and the transmission unit is used as a data transmission unit in an SST packet. Figure 3 The transmission unit shown includes a plurality of valid data symbols, a filling start (FS), a plurality of stuffed data symbols, and a filling end (FE), wherein the plurality of valid data symbols correspond to data in the image stream, such as horizontal blanking intervals, valid display data in the valid area, etc., and the plurality of stuffed data symbols are redundant data (dummy data) or invalid data (invalid data). It should be noted that due to Figure 3The architecture and functions of the transmission unit have been clearly described in the DP specification, so the details are not repeated here. Figure 4 If the processing circuit 123 determines Figure 2 If the size of the horizontal blanking gap indicated by the MST packet time slot configuration shown is normal (within a preset range or above a critical value), the processing circuit 123 can determine that the SST packet has a first transmission unit 410, wherein the first transmission unit 410 includes 32 symbols, and the 32 symbols include 16 valid data symbols and 16 padding data symbols. In addition, if the processing circuit 123 determines that Figure 2 If the horizontal blanking gap indicated by the MST packet time slot configuration shown is too small (e.g., less than a critical value), the processing circuit 123 may determine that the SST packet has a second transmission unit 420, wherein the second transmission unit 420 includes 32 symbols, and the 32 symbols include 20 valid data symbols and 12 padding data symbols. As described above, since the processing circuit 123 analyzes the size of the horizontal blanking gap after receiving the MST packet to determine the number of valid data symbols in the transmission unit, the number of the overall transmission units will change due to the different number of valid data symbols in the transmission unit, for example Figure 4 The SST packet shown requires more first transmission units 410 to transmit all valid data symbols, while the SST packet only requires fewer second transmission units 420 to transmit all valid data symbols, so the purpose of adjusting the size / length of the horizontal blanking interval can be achieved.

[0021] In the second embodiment, the receiving circuit 122 first receives an MST packet from the image generating device, and the processing circuit 123 converts the received MST packet into the format of an SST packet, wherein the SST packet has a first transmission unit 410, and then the processing circuit 123 measures the horizontal blanking gap of the SST packet to determine whether to adjust the number of valid data symbols of the first transmission unit 420 to generate a second transmission unit 420. Specifically, if the processing circuit 123 measures that the size of the horizontal blanking gap represented by the SST packet is normal (within a preset range or above a critical value), the processing circuit 123 can determine that the SST packet has the first transmission unit 410, that is, there is no need to adjust the number of valid data symbols of the first transmission unit 410. In addition, if the processing circuit 123 measures that the horizontal blanking gap represented by the SST packet is too small (for example, less than a critical value), the processing circuit 123 can adjust the number of valid data symbols of the first transmission unit 420 to generate the second transmission unit 420, wherein if Figure 4The number of valid data symbols in the second transmission unit 420 is shown to be greater than the number of valid data symbols in the first transmission unit 410. As described above, since the processing circuit 123 measures the horizontal blanking interval of the SST packet to determine the number of valid data symbols in the transmission unit, the number of the overall transmission units will change due to the different numbers of valid data symbols in the transmission units, for example Figure 4 The SST packet shown requires more first transmission units 410 to transmit all valid data symbols, while the SST packet only requires fewer second transmission units 420 to transmit all valid data symbols, so the purpose of adjusting the size / length of the horizontal blanking interval can be achieved.

[0022] In addition, the transmitting circuit 124 transmits the SST packets finally generated by the processing circuit 123 to the backend device 130 .

[0023] In another embodiment, the processing circuit 123 may adjust only some of the transmission units in multiple SST groups, that is, only increase the proportion of valid data symbols in some of the transmission units, while the proportion of valid data symbols in other transmission units remains unchanged. This design change should fall within the scope of the present invention.

[0024] As mentioned above, through Figure 4 The increase of valid data symbols in the transmission unit shown in the embodiment can solve the problem that the original horizontal blanking interval is too small and may cause the back-end device 130 to be unable to decode the control symbols or secondary data carried in the horizontal blanking interval in real time.

[0025] In an embodiment, the processing circuit 123 may count the sizes of horizontal blanking gaps received within a period of time, and determine whether to increase or decrease the number of valid data symbols in a transmission unit according to the minimum horizontal blanking gap or the maximum horizontal blanking gap among the plurality of horizontal blanking gaps. For example, if the processing circuit 123 determines that the maximum horizontal blanking gap is higher than a critical value, the processing circuit 123 may reduce the proportion of valid data symbols in each transmission unit; and if the processing circuit 123 determines that the minimum horizontal blanking gap is lower than a critical value, the processing circuit 123 may increase the proportion of valid data symbols in each transmission unit to stabilize the size of the horizontal blanking gap.

[0026] Figure 5 is a flow chart of a signal processing method according to an embodiment of the present invention. Referring to the contents described in the above embodiment, the flow of the signal processing method is as follows:

[0027] Step S500: The process starts.

[0028] Step S502: Receive an MST packet that complies with the DP specification.

[0029] Step S504: convert the MST packet into a plurality of SST packets, and determine the number of valid data symbols in the transmission units included in the plurality of SST packets according to the horizontal blanking interval information represented by the MST packet or the plurality of SST packets.

[0030] Step S506: Transmit the multiple SST packets to the backend device.

[0031] Figure 6 600 according to an embodiment of the present invention. Figure 6 As shown, the system 600 includes an image generating device 610, a relay device 620, and a backend device 630, wherein the image generating device 610 includes an image stream generating circuit 612, a DP format conversion circuit 614, an MST packet generating circuit 616, and a transmitting circuit 618; and the relay device 620 includes a receiving circuit 622, a processing circuit 623, a transmitting circuit 624, and an Extended Display Identification Data (EDID) adjusting circuit 626. In this embodiment, the image generating device 610 can be any circuit or device that can generate an MST packet that complies with the DP specification, the relay device 620 can be a branch device, a conversion device, or any other circuit or device that can convert an MST packet that complies with the DP specification into an SST packet, and the backend device 630 can be any display or display panel that can process the SST packet for image display.

[0032] In the operation of the system 600, the image stream generation circuit 612 is used to generate an image stream, wherein the image stream complies with the Video Electronics Standards Association (VESA) specification. Then, the DP format conversion circuit 614 performs format conversion on the image stream to generate an SST packet that complies with the DP specification, and the MST packet generation circuit 616 performs time slot scheduling on the SST packet to generate an MST packet, and the MST packet is transmitted to the relay device 620 through the transmission circuit 618. Then, after the receiving circuit 622 of the relay device 620 receives the MST packet from the image generation device 610, the processing circuit 623 converts the received MST packet into the format of the SST packet, and transmits it to the backend device 630 through the transmission circuit 624 for subsequent decoding and display.

[0033] like Figure 2As described in the embodiment, since the size of the horizontal blank gap corresponding to the MST grouping will vary with the time points when the BS and BE are generated, the above-mentioned problem of the non-fixed length of the horizontal blank gap will cause trouble in the processing of the back-end circuit, especially when the horizontal blank gap is too small, it may cause the back-end circuit to be unable to decode the control symbols or secondary data carried in the horizontal blank gap in real time, causing some auxiliary functions to fail.

[0034] To solve the above problem, this embodiment proposes to set an EDID adjustment circuit 626 in the relay device 620, which can adjust the EDID information read from the back-end device 630 to prevent the back-end device 630 from being unable to decode the control symbols or secondary data carried in the horizontal blanking interval in real time.

[0035] Specifically, the backend device 630 stores display-related information in its own memory, such as EDID developed by the VESA Association, which includes display-related information, such as display name, product serial number, supported resolution, sound format, multiple display parameters, etc. The EDID adjustment circuit 626 reads the EDID from the backend device 630, and adjusts the size of the horizontal blanking gap included in the read EDID to generate an adjusted EDID (EDID' shown in the figure), and transmits the adjusted EDID to the image stream generation circuit 612 in the image generation device 610, so that the image stream generation circuit 612 can adjust the horizontal blanking gap in advance to avoid the problem of too small horizontal blanking gap in the generated image stream after being processed by the subsequent MST grouping generation circuit 616.

[0036] For example, the processing circuit 623 may count the sizes of horizontal blanking gaps received within a period of time (eg, Figure 2 ), and determines whether to adjust the size of the horizontal blanking gap included in the EDID according to the minimum horizontal blanking gap among the multiple horizontal blanking gaps. If the processing circuit 623 determines that the minimum horizontal blanking gap is lower than the critical value, the EDID adjustment circuit 626 increases the size of the horizontal blanking gap included in the EDID read from the back-end device 630 to generate an adjusted EDID, and transmits the adjusted EDID to the image stream generation circuit 612 in the image generation device 610. Then, as Figure 7 As shown, since the image stream generating circuit 612 receives an adjusted EDID with a larger horizontal blank gap, the image stream generated by the image stream generating circuit 612 will also have a larger horizontal blank gap, so the width from the BS to the next BE of the link layer increases, and the horizontal blank gap will also be larger in the MST grouping.

[0037] As described above, by increasing the size of the horizontal blanking gap included in the EDID read from the back-end device 630 as shown in the embodiments of Figures 6 and 7, the problem that the original horizontal blanking gap is too small and the back-end device 630 may be unable to decode the control symbols or secondary data carried in the horizontal blanking gap in real time can be solved.

[0038] Similarly, the processing circuit 623 can count the sizes of the horizontal blanking gaps received within a period of time, and determine whether to adjust the size of the horizontal blanking gap included in the EDID according to the minimum horizontal blanking gap or the maximum horizontal blanking gap among the plurality of horizontal blanking gaps. If the processing circuit 623 determines that the minimum horizontal blanking gap or the maximum horizontal blanking gap is higher than the critical value, the EDID adjustment circuit 626 will reduce the size of the horizontal blanking gap included in the EDID read from the back-end device 630 to stabilize the size of the horizontal blanking gap represented in the MST group output by the image generating device 610.

[0039] In addition, since the MST packet output by the image generating device 610 is generated with reference to the adjusted EDID, and the horizontal blank gap included in the adjusted EDID is not the horizontal blank gap recorded in the original EDID of the back-end device 630, after the relay device 620 receives the MST packet from the image generating device 610, the processing circuit 623 will reduce the horizontal blank gap when generating the SST packet to be consistent with the horizontal blank gap recorded in the original EDID of the back-end device 630.

[0040] Figure 8 is a flow chart of a signal processing method according to an embodiment of the present invention. Referring to the contents described in the above embodiment, the flow of the signal processing method is as follows:

[0041] Step S800: The process starts.

[0042] Step S802: Receive EDID from a backend device.

[0043] Step S804: adjusting the size of the horizontal blank space included in the EDID to generate an adjusted EDID.

[0044] Step S806: Transmit the adjusted EDID to the image generating device to generate an MST packet that complies with the DP specification.

[0045] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

[0046]

Explanation of symbols

[0047] 100: System

[0048] 110: Image Generating Device

[0049] 112: Video stream generation circuit

[0050] 114: DP format conversion circuit

[0051] 116: MST group generation circuit

[0052] 118: Transmission Circuit

[0053] 120: Relay device

[0054] 122: Receiving circuit

[0055] 123: Processing circuit

[0056] 124: Transmission Circuit

[0057] 130: Backend device

[0058] 410: First transmission unit

[0059] 420: Second transmission unit

[0060] S500~S506: Steps

[0061] 600: System

[0062] 610: Image Generating Device

[0063] 612: Video stream generation circuit

[0064] 614: DP format conversion circuit

[0065] 616: MST group generation circuit

[0066] 618: Transmission Circuit

[0067] 620: Relay device

[0068] 622: Receiving circuit

[0069] 623: Processing Circuit

[0070] 624: Transmission Circuit

[0071] 626: EDID adjustment circuit

[0072] 630: Backend device

[0073] S800~S806: Steps

[0074] BS: blank area starts

[0075] BE: End of blank area

Claims

1. A signal processing method, comprising: receiving an MST packet conforming to a display interface specification, wherein the MST packet is a multi-stream transmission packet; Convert the MST packet into a plurality of SST packets, wherein the SST packet is a single stream transmission packet; Determine the number of valid data symbols in the transmission unit included in the multiple SST packets according to the horizontal blanking interval information represented by the MST packet or the multiple SST packets; as well as The plurality of SST packets are transmitted to a backend device.

2. The signal processing method as claimed in claim 1, wherein the step of determining the number of valid data symbols in the transmission unit included in the plurality of SST packets according to the horizontal blanking interval information represented by the MST packet or the plurality of SST packets comprises: If the MST packet or the plurality of SST packets indicate that the horizontal blanking interval information is higher than a critical value, determining that the plurality of SST packets have a first transmission unit; If the MST packet or the plurality of SST packets indicate that the horizontal blanking interval information is lower than the critical value, determining that the plurality of SST packets have a second transmission unit; The second transmission unit has the same size as the first transmission unit, and the number of valid data symbols included in the second transmission unit is greater than the number of valid data symbols included in the first transmission unit.

3. The signal processing method of claim 1 , wherein the horizontal blanking gap information includes a plurality of horizontal blanking gaps, and the step of determining the number of valid data symbols in the transmission unit included in the plurality of SST groups according to the horizontal blanking gap information represented by the MST group or the plurality of SST groups comprises: The number of valid data symbols in the transmission unit included in the plurality of SST packets is determined according to the minimum horizontal blanking interval among the plurality of horizontal blanking intervals.

4. The signal processing method of claim 1 , wherein the SST packet comprises a first transmission unit, and the step of determining the number of valid data symbols in the transmission units included in the plurality of SST packets according to the horizontal blanking interval information represented by the MST packet or the plurality of SST packets comprises: If the MST packet or the plurality of SST packets indicate that the horizontal blanking interval information is lower than a critical value, adjusting the number of valid data symbols of the first transmission unit so that the plurality of SST packets have a second transmission unit; The second transmission unit has the same size as the first transmission unit, and the number of valid data symbols included in the second transmission unit is greater than the number of valid data symbols included in the first transmission unit.

5. A relay device, comprising: A receiving circuit, used for receiving an MST packet conforming to the display interface specification, wherein the MST packet is a multiple stream transmission packet; as well as a processing circuit, coupled to the receiving circuit, for converting the MST packet into a plurality of SST packets, and determining the number of valid data symbols in the transmission units included in the plurality of SST packets according to the horizontal blanking interval information represented by the MST packet or the plurality of SST packets, wherein the SST packet is a single stream transmission packet; as well as The transmitting circuit is used to transmit the multiple SST groups to the backend device.

6. A relay device as described in claim 5, wherein if the MST packet or the multiple SST packets indicate that the horizontal blank gap information is higher than a critical value, the processing circuit determines that the multiple SST packets have a first transmission unit; and if the MST packet or the multiple SST packets indicate that the horizontal blank gap information is lower than the critical value, the processing circuit determines that the multiple SST packets have a second transmission unit, wherein the second transmission unit has the same size as the first transmission unit, and the number of valid data symbols included in the second transmission unit is higher than the number of valid data symbols included in the first transmission unit.

7. The relay device as claimed in claim 5, wherein the horizontal blanking gap information includes a plurality of horizontal blanking gaps, and the processing circuit determines the number of valid data symbols in the transmission unit included in the plurality of SST packets according to a minimum horizontal blanking gap among the plurality of horizontal blanking gaps.

8. A relay device as described in claim 5, wherein the SST packet includes a first transmission unit; and if the MST packet or the multiple SST packets indicate that the horizontal blank gap information is lower than a critical value, the processing circuit adjusts the number of valid data symbols of the first transmission unit so that the multiple SST packets have a second transmission unit, wherein the second transmission unit has the same size as the first transmission unit, and the number of valid data symbols included in the second transmission unit is higher than the number of valid data symbols included in the first transmission unit.

9. A signal processing method, comprising: receiving an EDID from a backend device, the EDID being an extended display capability identification; Adjusting the size of the horizontal blanking gap included in the EDID to generate an adjusted EDID; as well as The adjusted EDID is transmitted to the image generating device to generate an MST packet that complies with the display interface specification, wherein the MST packet is a multi-stream transmission packet.

10. The signal processing method as claimed in claim 9, wherein the step of adjusting the size of the horizontal blanking gap included in the EDID to generate the adjusted EDID comprises: counting a plurality of horizontal blanking gaps in the MST packets previously received from the image generating device; as well as The size of the horizontal blanking gap included in the EDID is increased according to the smallest horizontal blanking gap among the plurality of horizontal blanking gaps to generate the adjusted EDID.

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