TWI524750B - Adjusting module of analog image signals and adjusting method of analog image signals - Google Patents

Description

Analog image signal adjustment module and analog image signal adjustment method

The invention relates to an analog image signal adjustment module and an analog image signal adjustment method, and more particularly to an analog image signal adjustment module and an analog image signal adjustment method capable of adjusting an unsynchronized complex analog image signal to be close to relative synchronization.

With the advancement of image processing technology, display devices are becoming more and more popular. However, when the plurality of analog image signals received by the display device are out of phase, if the phase difference between the analog image signals is not adjusted, the analog video signal is converted into a digital image signal and the subsequent signal processing is performed. The screen displayed at the end of the device may cause a color shift, which affects the user's viewing of the screen. .

Therefore, an object of the present invention is to provide an analog image signal adjustment module and analog image signal adjustment method capable of adjusting a plurality of asynchronous image signals to analog signals of a plurality of close relative synchronizations to improve display image color shift. The situation.

According to an embodiment, the analog image signal adjustment module of the present invention comprises a receiving unit, a memory unit and a processing unit. The receiving unit includes a first channel, a second channel, and a third channel, where the first channel, the second channel, and the third channel are respectively configured to receive the first analog image signal, the second analog image signal, and the third analog image signal, and the first G The track and the third channel can be selectively turned off, respectively. The receiving unit selectively receives at least one of the first analog video signal, the second analog video signal and the third analog video signal according to a predetermined condition to generate a plurality of original analog video signals. The memory unit is coupled to the receiving unit to store the plurality of original analog image signals. The processing unit is coupled to the memory unit and the receiving unit, and the processing unit compares the plurality of original analog image signals with the corresponding clock signal to determine the phase difference information, and controls the receiving unit to delay the received first analog image signal according to the phase difference information, and the second At least one of the analog image signal and the third analog image signal.

According to another embodiment, the analog image signal adjustment method of the present invention is applied to an analog image signal adjustment module, and the analog image signal adjustment module includes a first channel, a second channel, and a third channel, a first channel and a second channel. And the third channel is configured to receive the first analog image signal, the second analog image signal, and the third analog image signal, respectively, and the first channel and the third channel are selectively turned off respectively, and the analog image signal adjustment method includes: Corresponding to the clock signal and selectively receiving at least one of the first analog image signal, the second analog image signal and the third analog image signal by the first channel, the second channel and the third channel according to a predetermined condition to generate a plurality of The original analog image signal; comparing the plurality of original analog image signals with the corresponding clock signal to determine the phase difference information; and delaying the first analog image signals respectively received by the first channel, the second channel, and the third channel according to the phase difference information, The second analog image signal and the third analog image signal are at least one of them.

In summary, the analog image signal adjustment module and the analog image signal adjustment method of the present invention adjust the phase difference between the analog image signal and the clock signal by comparing the plurality of asynchronous signals, and adjust the phase of the complex analog video signal. The analog analog video signals that are not synchronized are adjusted to be close to the relative synchronous analog video signals, or at least reduce the phase difference between each other. Thereby, the situation of the color shift of the display screen can be improved.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

Please refer to FIG. 1 . FIG. 1 is a schematic diagram of an analog video signal adjustment module 1 according to an embodiment of the invention. As shown in FIG. 1, the analog video signal adjustment module 1 includes a receiving unit 11, a memory unit 13, and a processing unit 15. The memory unit 13 is coupled to the receiving unit 11 and the processing unit 15, respectively, and the processing unit 15 is coupled to the receiving unit 11. The receiving unit 11 includes a first channel 111, a second channel 113, and a third channel 115. The first channel 111, the second channel 113, and the third channel 115 are respectively configured to receive the first analog image signal S1 and the second analog image signal S2. Compared with the third analog image signal S3, the first channel 111 and the third channel 115 can be selectively turned off, respectively, and the second channel 113 cannot be turned off. That is to say, as long as the receiving unit 11 is in operation, the receiving unit 11 must receive the second analog video signal S2 through the second channel 113. Whether the first analog image signal S1 and the third analog image signal S3 are also received when the receiving unit 11 is in operation, respectively, the first channel 111 is viewed. It is determined whether or not the third channel 115 is turned on. For example, if the first channel 111, the second channel 113, and the third channel 115 of the receiving unit 11 are all turned on, the receiving unit 11 receives the first channel 111, the second channel 113, and the third channel 115, respectively. The analog video signal S1, the second analog video signal S2 and the third analog video signal S3, the receiving unit 11 outputs the mixed signals of the three analog video signals. If only the first channel 111 and the second channel 113 of the receiving unit 11 are turned on, and the third channel 115 is selectively turned off, the receiving unit 11 receives the first analogy only by the first channel 111 and the second channel 113, respectively. The image signal S1 and the second analog image signal S2 output a mixed signal of the two analog image signals. Similarly, if only the second channel 113 and the third channel 115 of the receiving unit 11 are turned on, and the first channel 111 is selectively turned off, the receiving unit 11 receives only the second channel 113 and the third channel 115, respectively. The second analog image signal S2 and the third analog image signal S3 output a mixed signal of the two analog image signals. If only the second channel 113 of the receiving unit 11 is turned on, and the first channel 111 and the third channel 115 are both selectively turned off, the receiving unit 11 receives the second analog image signal S2 only through the second channel 113, and The second analog image signal S2 is directly output.

In an actual application, the analog image signal adjustment module 1 can be applied to an image signal processing chip of a display device (for example, a scaler IC), and the display device receives an analog image signal that is out of synchronization from a signal source (for example, a computer host). (For example, after receiving the VGA signal through the D-Sub cable), the analog video signal adjustment module 1 adjusts the analog video signal that is not synchronized to an analog video signal that is close to the relative synchronization. Or at least reducing the phase difference between the unsynchronized analog video signals, and then performing the subsequent processing of the adjusted analog video signal (for example, converting the analog video signal into a digital video signal) so as to finally display the image quality on the display device. Better. In practical applications, the first analog image signal S1, the second analog image signal S2 and the third analog image signal S3 are respectively red analog image signals (R), green analog image signals (G) and blue in the VGA signal. Analog video signal (B), and the first channel 111, the second channel 113, and the third channel 115 are respectively configured to receive the red analog image signal (R), the green analog image signal (G), and the blue analog image. The red signal channel (R Channel), the green signal channel (G Channel) and the blue signal channel (B Channel) of the signal (B) depend on the actual application.

In an embodiment of the present invention, the receiving unit 11 selectively receives the first analog video signal S1, the second analog video signal S2, and the third analog video signal S3 according to a predetermined condition, corresponding to a clock signal CS. One of the plurality of original analog image signals is generated, and the plurality of original analog image signals are stored in the memory unit 13.

Please refer to FIG. 2, FIG. 3 and FIG. 4 simultaneously. FIG. 2 is a schematic diagram of a first mixed analog video signal according to an embodiment of the invention, and FIG. 3 is a second embodiment of the present invention. A schematic diagram of a mixed analog video signal, and FIG. 4 is a schematic diagram showing a second analog video signal according to an embodiment of the present invention. Specifically, in an embodiment of the present invention, the predetermined condition may be: under the corresponding clock signal CS, the receiving unit 11 first selectively turns off the first channel 111 to pass only the second channel. The first analog image signal is formed by the first analog image signal S2 and the third analog image signal S3. MS1 is output to the memory unit 13, as shown in FIG. 2; then, under the corresponding clock signal CS, the receiving unit 11 instead selectively turns off the third channel to pass only the first channel 111 and the second channel. The first analog video signal S1 and the second analog image signal S2 are respectively received by the receiving unit 11 and the second analog analog video signal MS2 is mixed with the first analog video signal S1 and the second analog video signal S2 and output to the second analog analog video signal MS2. The memory unit 13 is as shown in FIG. 3; and under the corresponding clock signal CS, the receiving unit 11 further selectively turns off the first channel 111 and the third channel 115 simultaneously to receive only the second channel 113. The second analog image signal S2 is directly output to the memory unit 13, as shown in FIG. Therefore, in this embodiment, the plurality of original analog image signals include a first mixed analog video signal MS1, which is a mixture of the second analog video signal S2 and the third analog video signal S3, and the first analog video signal S1 and the second analogy. The second mixed analog image signal MS2 is mixed with the image signal S2, and the second analog image signal S2. When the processing unit 15 performs the foregoing receiving operation, it is not necessary to follow the specific sequence, as long as the first mixed analog video signal MS1, the second mixed analog video signal MS2, and the second analog video signal S2 are finally available.

Then, the processing unit 15 compares the plurality of original analog image signals stored in the memory unit 13 with the corresponding clock signal CS to determine a phase difference information, and controls the receiving unit 11 to delay the received first analog image signal S1 according to the phase difference information. ,second At least one of the analog image signal S2 and the third analog image signal S3. Specifically, the processing unit 15 compares the first mixed analog image signal MS1 with the clock signal CS to obtain a first phase difference PD1, as shown in FIG. The processing unit 15 compares the second mixed analog image signal MS2 with the clock signal CS to obtain a second phase difference PD2, as shown in FIG. The processing unit compares the second analog image signal S2 with the clock signal CS to obtain a third phase difference PD3, as shown in FIG. The phase difference information includes a first phase difference PD1, a second phase difference PD2, and a third phase difference PD3. When the processing unit 15 performs the above three comparison operations, it is not necessary to obtain the first phase difference PD1, the second phase difference PD2, and the third phase difference PD3 in the specific order. Next, the processing unit 15 compares the difference between the first phase difference PD1, the second phase difference PD2, and the third phase difference PD3 to generate a first analog image signal S1, a second analog image signal S2, and a third analogy, respectively. The first delay parameter, the second delay parameter and the third delay parameter in which the phase of the image signal S3 is relatively advanced or delayed. Finally, the processing unit 15 controls the receiving unit 11 to delay the first analog image signals respectively received by the first channel 111, the second channel 113, and the third channel 115 according to the first delay parameter, the second delay parameter, and the third delay parameter. At least one of S1, the second analog image signal S2 and the third analog image signal S3, so that the first analog image signal S1, the second analog image signal S2 and the third analog image signal S3 that are not synchronized are adjusted to be close to each other. Synchronize, or at least reduce, the phase difference between each other. Specifically, because the first phase difference PD1, the second phase difference PD2, and the third phase difference PD3 are compared by the processing unit 15 respectively, the first mixed analog image signal MS1, the second mixed analog image signal MS2, and the second analogy are compared. Image signal S2 relative The respective phase difference obtained by the clock signal CS, and under the predetermined condition of the embodiment, the first mixed analog image signal MS1 and the second mixed analog image signal MS2 are respectively the second analog image signal S2 and the third The mixed signal of the analog image signal S3 and the mixed signal of the first analog image signal S1 and the second analog image signal S2, so in the present embodiment, the processing unit 15 compares the first phase difference PD1, the second phase difference PD2 and the first After the difference between the three phase difference PD3s, the precise phase difference between the first analog image signal S1, the second analog image signal S2 and the third analog image signal S3 cannot be obtained, which is limited by the receiving unit only The first channel and the third channel are selectively turned off, respectively, and the second channel is not selectively limited by the closed hardware. However, since the second analog image signal S2 is not a mixed signal, if the third phase difference PD3 obtained by comparing the second analog image signal S2 with the clock signal CS is used as a reference, the third phase difference PD3 is compared with the comparison. The first phase difference PD1 obtained by mixing the analog image signal MS1 with the clock signal CS and the second mixed analog image signal MS2 and the clock signal CS are compared with each other to obtain the second phase difference PD2, and the comparison result can still be adjusted. The first analog image signal S1, the second analog image signal S2 and the third analog image signal S3 are in phase difference with each other, so that the three are close to the relative synchronization by adjusting the phase by time delay, or at least reduce each other. The phase difference.

For example, if the processing unit 15 compares the difference between the first phase difference PD1, the second phase difference PD2, and the third phase difference PD3, it is determined that the first analog image signal S1 and the second analog image signal S2 are ahead of the third analogy. Image signal S3, processing unit The first delay parameter and the second delay parameter respectively control the receiving unit 11 to delay the first analog image signal S1 and the second analog image signal S2 received by the first channel 111 and the second channel 113, so that the first The phase between the analog image signal S1, the second analog image signal S2 and the third analog image signal S3 is relatively synchronous, or at least reduces the phase difference between each other. If the processing unit 15 compares the difference between the first phase difference PD1, the second phase difference PD2, and the third phase difference PD3, it is determined that the first analog image signal S1 and the third analog image signal S3 lead the second analog image signal S2. The processing unit 15 controls the receiving unit 11 to delay the first analog image signal S1 and the third analog image signal S3 received by the first channel 111 and the third channel 115 according to the first delay parameter and the third delay parameter, respectively. The phase between the first analog image signal S1, the second analog image signal S2 and the third analog image signal S3 is relatively synchronized, or at least reduced from each other. Similarly, if the processing unit 15 compares the difference between the first phase difference PD1, the second phase difference PD2, and the third phase difference PD3, it is determined that the second analog image signal S2 and the third analog image signal S3 lead the first analog image. The signal S1, the processing unit 15 controls the receiving unit 11 to delay the second analog image signal S2 and the third analog image received by the second channel 113 and the third channel 115 according to the second delay parameter and the third delay parameter, respectively. The signal S3 is such that the phase between the first analog image signal S1, the second analog image signal S2 and the third analog image signal S3 is relatively synchronous, or at least reduced from each other.

Please refer to Figure 5 and refer to Figures 2 through 4 at the same time. Figure 5 is based on A schematic diagram of an original analog image signal and phase difference information according to an embodiment of the present invention, wherein the original analog image signal includes a first mixed analog image signal MS1, a second mixed analog image signal MS2, and a second analog image signal S2, and the phase difference information The first phase difference PD1, the second phase difference PD2, and the third phase difference PD3 are included. In practical applications, the time unit of the phase difference information may correspond to different time intervals, for example, each time unit corresponds to 90 picoseconds.

As shown in FIG. 5, the processing unit 15 compares the first mixed analog image signal MS1 (mixed between the second analog image signal S2 and the third analog image signal S3) and the clock signal CS (as shown in FIG. 2). Thereafter, the first phase difference PD1 is obtained as 53 time units. The processing unit 15 compares the second mixed analog image signal MS2 (from the first analog image signal S1 and the second analog image signal S2) and the clock signal CS (as shown in FIG. 3), and obtains the second phase difference PD2 of 45. time unit. The processing unit 15 compares the second analog image signal S2 with the clock signal CS (as shown in FIG. 4), and obtains the third phase difference PD3 as 44 time units. In this embodiment, since the third phase difference PD3 is the smallest among the first phase difference PD1, the second phase difference PD2, and the third phase difference PD3, the processing unit 15 can use the third phase difference PD3 as a reference. The second delay parameter corresponding to the second analog image signal S2 is set to 0 time unit.

The difference between the first phase difference PD1 and the third phase difference PD3 is 9 time units, and the first phase difference PD1 corresponds to the first mixed analog image signal MS1 (by the second analogy The image signal S2 is mixed with the third analog image signal S3, so that the third delay parameter corresponding to the third analog image signal S3 can be set to 9 time units. That is to say, in the phase difference caused by the first mixed analog video signal MS1, which is formed by mixing the second analog image signal S2 and the third analog image signal S3, it is estimated by the second analog image signal S2. The resulting phase difference affects the removal to estimate the phase difference caused by the third analog image signal S3, and accordingly sets a third delay parameter corresponding to the third analog image signal S3. Similarly, the difference between the second phase difference PD2 and the third phase difference PD3 is 1 time unit, and the second phase difference PD2 corresponds to the second mixed analog image signal MS2 (from the first analog image signal S1 and the second analog image) The signal S2 is mixed, so that the first delay parameter corresponding to the first analog video signal S1 can be set to 1 time unit. That is to say, in the phase difference caused by the second mixed analog video signal MS2, which is a mixture of the first analog video signal S1 and the second analog video signal S2, the estimation method is roughly determined by the second analog video signal S2. The resulting phase difference affects the removal to estimate the phase difference caused by the first analog image signal S1, and accordingly sets the first delay parameter corresponding to the first analog image signal S1. In this embodiment, the first delay parameter, the second delay parameter, and the third delay parameter corresponding to the first analog image signal S1, the second analog image signal S2, and the third analog image signal S3 are respectively 1 time unit, 0. The time unit and the 9 time unit, the processing unit 15 controls the receiving unit 11 to delay the first analog image signal S1 received by the first channel 111 by one time unit and delay according to the first delay parameter and the third delay parameter, respectively. The third analog image signal S3 received by the third channel 115 reaches 9 time units, so that the first analog image signal S1 and the second analog image signal S2 The phase between the third analog image signal S3 is close to relative synchronization, or at least reduces the phase difference between each other. If the time unit corresponds to 90 picoseconds as an example, in this embodiment, the processing unit 15 controls the receiving unit 11 to delay the first analog image signal S1 by 90 picoseconds and delay the third analog image signal S3. 810 picoseconds.

In other embodiments, if the difference between the first phase difference PD1, the second phase difference PD2, and the third phase difference PD3 is based on the first delay parameter, the second delay parameter, and the third delay parameter, the first analogy If the image signal S1, the second analog image signal S2 and the third analog image signal S3 are close to relative synchronization, only one other unsynchronized signal needs to be adjusted. For example, if the processing unit 15 compares the difference between the first phase difference PD1, the second phase difference PD2, and the third phase difference PD3, it is determined that the phase of the second analog image signal S2 and the third analog image signal S3 are close. The first analog optical signal S1 leads the second analog video signal S2 and the third analog video signal S3, and the processing unit 15 controls the receiving unit 11 to delay receiving by the first channel 111 according to the first delay parameter. The first analog image signal S1 is such that the phase between the first analog image signal S1, the second analog image signal S2 and the third analog image signal S3 is relatively synchronous, or at least reduced from each other.

Please refer to FIG. 6. FIG. 6 is a flow chart of an analog image signal adjustment method according to an embodiment of the invention. The analog image signal adjustment method of the present invention is applied to the analog video signal adjustment module 1 as shown in FIG. Please refer to Figure 1 to the first 4, the analog image signal adjustment method of the present invention comprises the following steps. First, in step S100, the first analog image signal S1 and the second analog image signal are selectively received by the first channel 111, the second channel 113, and the third channel 115 under the corresponding clock signal CS and according to predetermined conditions. At least one of S2 and the third analog image signal S3 to generate a plurality of original analog image signals. Next, step S102 is executed to compare the complex original analog image signal with the corresponding clock signal CS to determine the phase difference information. Finally, step S104 is executed to delay the first analog image signal S1, the second analog image signal S2 and the third analog image signal S3 respectively received by the first channel 111, the second channel 113 and the third channel 115 according to the phase difference information. At least one of them.

Further, the step S100 may include: selectively closing the first channel 111 to generate a first analog analog image signal MS1 mixed with the second analog image signal S2 and the third analog image signal S3; selectively turning off the first The third channel 115 generates a second mixed analog image signal MS2 which is a mixture of the first analog image signal S1 and the second analog image signal S2; and selectively turns off the first channel 111 and the third channel 115 to receive the second analog image. The signal S2, and the plurality of original analog image signals include a first mixed analog video signal MS1, a second mixed analog video signal MS2, and a second analog video signal S2. Step S102 may further include: comparing the first mixed analog image signal MS1 with the clock signal CS to obtain a first phase difference PD1; comparing the second mixed analog image signal MS2 with the clock signal CS to obtain a second phase difference PD2, and comparing The second analog image signal S2 and the clock signal CS are used to obtain a third phase difference PD3, and the phase difference information includes a first phase difference PD1 and a second phase difference PD2. The third phase difference is PD3. The step S104 may further include: comparing the first phase difference PD1, the second phase difference PD2, and the third phase difference PD3 to generate the first analog image signal S1, the second analog image signal S2, and the third analog image signal respectively. a first delay parameter, a second delay parameter, and a third delay parameter of S3, and delaying the first channel 111, the second channel 113, and the third channel 115 according to the first delay parameter, the second delay parameter, and the third delay parameter, respectively Receiving at least one of the first analog image signal S1, the second analog image signal S2 and the third analog image signal S3.

In summary, the analog image signal adjustment module and the analog image signal adjustment method of the present invention adjust the phase difference between the analog image signal and the clock signal by comparing the plurality of asynchronous signals, and adjust the phase of the complex analog video signal. The analog analog video signals that are not synchronized are adjusted to be close to the relative synchronous analog video signals, or at least reduce the phase difference between each other. Thereby, the situation of the color shift of the display screen can be improved.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

1‧‧‧ analog image signal adjustment module

11‧‧‧ Receiving unit

13‧‧‧ memory unit

15‧‧‧Processing unit

111‧‧‧First Passage

113‧‧‧second channel

115‧‧‧ third channel

CS‧‧‧ clock signal

MS1‧‧‧ first mixed analog image signal

MS2‧‧‧Second mixed analog image signal

PD1‧‧‧First phase difference

PD2‧‧‧Second phase difference

PD3‧‧‧ Third phase difference

S1‧‧‧ first analog image signal

S2‧‧‧Second analog video signal

S3‧‧‧ third analog image signal

S100, S102, S104‧‧‧ steps

FIG. 1 is a schematic diagram of an analog video signal adjustment module according to an embodiment of the invention.

2 is a schematic diagram of a first mixed analog video signal according to an embodiment of the invention.

FIG. 3 is a schematic diagram of a second mixed analog video signal according to an embodiment of the invention.

4 is a schematic diagram of a second analog video signal according to an embodiment of the invention.

FIG. 5 is a schematic diagram of original analog image signal and phase difference information according to an embodiment of the invention.

FIG. 6 is a flow chart of an analog image signal adjustment method according to an embodiment of the invention.

S100, S102, S104‧‧‧ steps

Claims (6)

An analog video signal adjustment module includes: a receiving unit, including a first channel, a second channel, and a third channel, wherein the first channel, the second channel, and the third channel are respectively configured to receive a a first analog video signal, a second analog video signal, and a third analog video signal, and the first channel and the third channel are selectively turned off respectively, and the receiving unit is corresponding to a clock signal and according to a The predetermined condition selectively receives at least one of the first analog image signal, the second analog image signal, and the third analog image signal to generate a plurality of original analog image signals; a memory unit coupled to the receiving unit, the memory The unit stores the plurality of original analog image signals; and a processing unit coupled to the memory unit and the receiving unit, the processing unit compares the plurality of original analog image signals with the corresponding clock signal to determine a phase difference information, and according to The phase difference information controls the receiving unit to delay receiving the first analog image signal, the second analog image signal, and the third class At least one of the image signals; wherein the predetermined condition is: the receiving unit selectively turns off the first channel to generate a first mixed analog image signal that is mixed with the second analog image signal and the third analog image signal The receiving unit selectively turns off the third channel to generate a second mixed analog image signal that is mixed with the first analog image signal and the second analog image signal, and the receiving unit selectively turns off the first The channel and the third channel receive the second analog image signal, and the plurality of original analog image signals include the first mixed analog video signal, the second mixed analog video signal, and the second analog video signal. The analog video signal adjustment module of claim 1, wherein the processing unit compares the first mixed analog video signal with the clock signal to obtain a first phase difference, and the processing unit compares the second mixed analog video signal With the clock The signal is obtained to obtain a second phase difference, and the processing unit compares the second analog image signal with the clock signal to obtain a third phase difference, the phase difference information including the first phase difference, the second phase difference and The third phase difference. The analog video signal adjustment module of claim 2, wherein the processing unit compares the first phase difference, the second phase difference, and the third phase difference to generate corresponding to the first analog video signal, respectively And comparing the first delay parameter, the second delay parameter and the third delay parameter, and delaying the second delay parameter, the second delay parameter and the third delay parameter according to the first analog image signal and the third analog image signal At least one of the first analog video signal, the second analog video signal, and the third analog video signal received by the receiving unit. An analog image signal adjustment method is applied to an analog image signal adjustment module, wherein the analog image signal adjustment module includes a first channel, a second channel and a third channel, the first channel and the second channel And the third channel is configured to receive a first analog image signal, a second analog image signal, and a third analog image signal, and the first channel and the third channel are selectively turned off, respectively. The image signal adjustment method includes the following steps: (1) selectively receiving the first analog image signal by using the first channel, the second channel, and the third channel according to a predetermined condition and corresponding to a predetermined condition, Comparing at least one of the second analog image signal and the third analog image signal to generate a plurality of original analog image signals; (2) comparing the plurality of original analog image signals with the corresponding clock signal to determine a phase difference information And (3) delaying the first analog video signal and the second analogy respectively received by the first channel, the second channel, and the third channel according to the phase difference information At least one of the image signal and the third analog image signal; wherein the predetermined condition is: selectively closing the first channel to generate the first analog image signal and the third analog image signal Mixed Combining the analog video signal, selectively closing the third channel to generate a second mixed analog video signal of the first analog video signal and the second analog video signal, and selectively turning off the first channel and The third channel receives the second analog image signal, and the plurality of original analog image signals include the first mixed analog video signal, the second mixed analog video signal, and the second analog video signal. The method for adjusting an analog video signal according to claim 4, wherein the step (2) comprises: comparing the first mixed analog video signal with the clock signal to obtain a first phase difference, and comparing the second mixed analog video signal with The clock signal is obtained to obtain a second phase difference, and the second analog image signal and the clock signal are compared to obtain a third phase difference, wherein the phase difference information includes the first phase difference, the second phase difference and The third phase difference. The method for adjusting an analog video signal according to claim 5, wherein the step (3) comprises: comparing the first phase difference, the second phase difference, and the third phase difference to generate corresponding to the first analog image signal, The second analog image signal and the third analog image signal are a first delay parameter, a second delay parameter and a third delay parameter, and according to the first delay parameter, the second delay parameter and the third delay The parameter delays at least one of the first analog video signal, the second analog video signal, and the third analog video signal respectively received by the first channel, the second channel, and the third channel.