CN-121985083-A - Dynamic anti-interference method and system for high-definition display main board

CN121985083ACN 121985083 ACN121985083 ACN 121985083ACN-121985083-A

Abstract

The invention relates to the technical field of display mainboards, and particularly discloses a dynamic anti-interference method and a system for a high-definition display mainboard, wherein an original noise baseline is established in a standby state, active response frequency bands are identified by injection test excitation, a link disturbance weighting index is dynamically generated in image transmission, an interference primary guide source is further positioned, and frequency band weight distribution with time stability is constructed, so that the system can continuously judge which frequency bands influence the link integrity according to the actual physical performance of each frequency band rather than a preset template; the process enables the anti-interference action to be anchored on the frequency band which is most active, least stable and most harmful to the link at present all times, thereby maintaining the stability of a physical layer of image transmission in the process of drifting noise frequency points and effectively relieving the abnormal image phenomenon caused by mismatch of the frequency points.

Inventors

LU PEIYAN
WU ZHANGAN

Assignees

广州云界大至智能科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260204

Claims (10)

1. A dynamic anti-interference method for a high definition display motherboard, comprising: In a standby state of the video output controller, synchronously acquiring original noise signals through a plurality of analog voltage probes distributed on a main board, and establishing an original noise baseline based on the original noise signals; Based on the original noise baseline, injecting a test excitation signal into the HDMI or DP physical layer, collecting a response signal, generating a differential spectrum by comparing the response signal with the original noise baseline, and identifying an active response frequency band from the differential spectrum; activating image data stream transmission, collecting noise signals in the image data stream transmission process, calculating a link disturbance spectrum, and generating a link disturbance weighting index by combining a protocol layer link state index, wherein the link disturbance spectrum is the difference value between the current noise signals and an original noise baseline; positioning an interference dominant source according to the contribution of each frequency band in the link disturbance weighting index, and generating frequency band weight distribution comprising frequency, spatial position and time stability; Configuring a plurality of tunable notch networks to carry out frequency division filtering according to the frequency band weight distribution, and setting the reestimation period of each notch network according to the time stability of each frequency band; And constructing a coupling strength matrix between frequency bands by perturbing each notch network and observing response changes of other frequency bands, identifying a master-slave relationship, and performing follow-up compensation on the slave frequency bands after the master frequency bands are regulated according to the master-slave relationship.
2. The method for dynamic anti-interference of high definition display motherboard according to claim 1, wherein said establishing an original noise baseline comprises: Calculating the variance value of each path of signal to form a variance vector; carrying out power spectrum density estimation on each path of original noise signal based on the variance vector to generate a power spectrum curve; identifying a local peak interval of which the energy is continuously higher than a mean value preset multiple from the power spectrum curve; and marking the local peak interval as an original noise baseline candidate frequency band with the center frequency and the bandwidth determined.
3. The method for dynamic anti-interference for a high definition display motherboard according to claim 1, wherein the identifying an active response frequency band comprises: Marking frequency points with energy increment exceeding a preset threshold value in the differential spectrum; Judging whether the marking frequency points synchronously appear in monitoring signals of a plurality of adjacent analog voltage probes; And clustering synchronously-occurring marked frequency points into active response frequency bands, and recording the central frequency and the bandwidth of the active response frequency bands.
4. The method for dynamic anti-interference of high definition display motherboard according to claim 1, wherein generating the link disturbance weighted index comprises: reading the eye pattern height attenuation rate, the clock jitter accumulation value and the symbol error count rate of the receiving end from the protocol layer; carrying out space-time alignment on an energy integral value of a specified frequency band in a link disturbance spectrum and a link state index of a protocol layer; and distributing weight coefficients for the frequency bands corresponding to different monitoring points according to the alignment results, and summing the weighted frequency band energy integral values to generate a link disturbance weighted index.
5. The dynamic anti-interference method for a high definition display motherboard of claim 1, wherein generating the frequency band weight distribution comprises: matching the frequency band with obvious contribution in the link disturbance weighted index to a physical interference source according to the main board hardware resource mapping table; Counting the occurrence times of each frequency band in ten continuous sampling windows to calculate time stability; constructing three-dimensional weight distribution, wherein the horizontal axis is frequency, the vertical axis is spatial position, and the vertical axis is time stability; and taking the frequency band with the highest numerical value in the weight distribution as a judging basis for correlation between the spatial position and the time stability.
6. The method for dynamic anti-interference of high definition display motherboard according to claim 1, wherein said configuring a plurality of tunable notch networks for frequency-division filtering comprises: Issuing a tuning instruction to the corresponding tunable notch network according to the frequency band with the highest weight in the frequency band weight distribution; The center frequency of the tunable notch network is adjusted by adopting a coarse adjustment, a medium adjustment and a fine adjustment third-order climbing mode; after each first order is adjusted, the circuit is waited to enter a steady state, the variance of the voltage fluctuation of the output end is collected, and if the variance reduction amplitude exceeds the preset proportion of the previous value, the adjustment is confirmed to be effective, and the next order is continued.
7. The method for dynamic anti-interference of high definition display motherboard according to claim 1, wherein said setting the re-estimation period of each notch network comprises: based on the basic reevaluation interval, calculating the reevaluation period of each notch network through linear mapping according to the time stability of each frequency band; Continuously monitoring a residual fluctuation variance sequence of the notch network output end in a reevaluation period; and if the residual fluctuation variance sequence continuously increases, triggering a re-estimation flow in advance, and suspending the image data stream from being inserted into the quiet period to re-acquire the baseline data and update the center frequency during re-estimation.
8. The method for dynamic anti-interference of high-definition display motherboard according to claim 1, wherein the constructing the inter-band coupling strength matrix comprises: Applying micro triangular wave modulation to the central frequency of each tunable notch network in sequence, and synchronously recording variance change rates of corresponding monitoring points of other frequency bands during modulation; filling the normalized slope of the variance change rate relative to the modulation amplitude into the corresponding position of the matrix; and identifying the unidirectional influence relation between the master frequency band and the slave frequency band according to the distribution of non-zero elements in the matrix.
9. The method for dynamic anti-interference of high definition display motherboard according to claim 1, wherein the performing the follow-up compensation on the slave frequency band comprises: When the center frequency of the tunable notch network corresponding to the main frequency band is updated, calculating the compensation quantity of the slave frequency band according to the main frequency band row elements in the inter-frequency band coupling strength matrix; synchronously adjusting the center frequency of the tunable notch network corresponding to the slave frequency band according to the compensation quantity; And ensuring that the slave frequency band compensation is completed within fifteen microseconds after the master frequency band adjustment action is completed, and verifying whether the fluctuation amplitude of the link disturbance weighted index after compensation is narrowed.
10. A dynamic anti-interference system for a high definition display motherboard for implementing the method of any of claims 1-9, comprising: the analog voltage probes are distributed on the main board and are used for collecting noise signals; The synchronous sampling unit is connected with the plurality of analog voltage probes and is used for synchronously collecting an original noise signal, a response signal and a noise signal in the image data stream transmission process; the processing unit is connected with the synchronous sampling unit and is used for establishing an original noise base line, generating a differential spectrum and a link disturbance spectrum, identifying an active response frequency band, generating a link disturbance weighting index and frequency band weight distribution and constructing a coupling strength matrix between frequency bands; the tunable notch networks are connected with the processing unit and are used for carrying out frequency band division filtering according to the frequency band weight distribution and executing master frequency band adjustment and slave frequency band following compensation according to the instruction of the processing unit; The processing unit is cooperated with the tunable notch networks to realize dynamic anti-interference flow of the reevaluation period and the master-slave relation according to time stability setting.

Description

Dynamic anti-interference method and system for high-definition display main board Technical Field The invention relates to the technical field of display mainboards, in particular to a dynamic anti-interference method and a system for a high-definition display mainboard. Background When the current high-definition display main board supports HDMI2.1 or DP2.1 ultra-high-definition image transmission, the current high-definition display main board generally faces the reality constraint of coexistence of multi-source high-frequency noise. The typical main board integrates a CPU, a GPU, a high-speed memory, PCIe expansion equipment, a USB main control and other functional units, and working clock harmonic waves, switching power supply ripples, data link reflection signals and the like of the typical main board form densely overlapped noise spectrums in the frequency band of 200MHz to 3 GHz. The prior art mainly adopts a static filtering scheme that an LC trap with fixed center frequency is arranged near an HDMI or DP interface, or a large-area ground plane and a local decoupling capacitor array in a PCB lamination design are relied on to perform broadband suppression. The scheme can meet the requirement of a basic eye diagram in a board level verification stage, but once the whole machine enters a real operation environment, the interference frequency point is offset under the influence of temperature change, load fluctuation and device aging, and the original filtering structure is detuned, so that common mode noise coupling is aggravated, and the common mode noise coupling is manifested as image edge flickering, color fault or occasional black screen. Therefore, the method has the clear technical problem that under the conditions that the multi-source high-frequency noise of the main board coexist and the frequency point drifts along with the working condition, key interference frequency bands which form a substantial threat to HDMI/DP2.1 ultra-high definition image transmission cannot be identified and distinguished in real time, so that anti-interference measures lag behind an interference evolution process. Disclosure of Invention The invention aims to provide a dynamic anti-interference method and a system for a high-definition display main board, which can effectively relieve image abnormity phenomenon caused by frequency point mismatch. In order to achieve the purpose, the technical scheme adopted by the invention is that the dynamic anti-interference method for the high-definition display main board comprises the following steps: In a standby state of the video output controller, synchronously acquiring original noise signals through a plurality of analog voltage probes distributed on a main board, and establishing an original noise baseline based on the original noise signals; Based on the original noise baseline, injecting a test excitation signal into the HDMI or DP physical layer, collecting a response signal, generating a differential spectrum by comparing the response signal with the original noise baseline, and identifying an active response frequency band from the differential spectrum; activating image data stream transmission, collecting noise signals in the image data stream transmission process, calculating a link disturbance spectrum, and generating a link disturbance weighting index by combining a protocol layer link state index, wherein the link disturbance spectrum is the difference value between the current noise signals and an original noise baseline; positioning an interference dominant source according to the contribution of each frequency band in the link disturbance weighting index, and generating frequency band weight distribution comprising frequency, spatial position and time stability; Configuring a plurality of tunable notch networks to carry out frequency division filtering according to the frequency band weight distribution, and setting the reestimation period of each notch network according to the time stability of each frequency band; And constructing a coupling strength matrix between frequency bands by perturbing each notch network and observing response changes of other frequency bands, identifying a master-slave relationship, and performing follow-up compensation on the slave frequency bands after the master frequency bands are regulated according to the master-slave relationship. Preferably, the establishing the original noise baseline includes: Calculating the variance value of each path of signal to form a variance vector; carrying out power spectrum density estimation on each path of original noise signal based on the variance vector to generate a power spectrum curve; identifying a local peak interval of which the energy is continuously higher than a mean value preset multiple from the power spectrum curve; and marking the local peak interval as an original noise baseline candidate frequency band with the center frequency and the bandwidth determined. Preferably