TWI396437B - Television signal processing apparatus and television signal processing method - Google Patents

Description

Television signal processing device and television signal processing method

The present invention relates to television signal processing, and more particularly to a television signal processing apparatus and a television signal processing method, which can reduce the degree of distortion of a television signal before demodulation by processing a feedback signal obtained by demodulating a television signal.

For analog TVs, composite video signals are often used because they carry luminance information, chroma information, and synchronization information. In addition, when transmitting, composite video signals are modulated by an RF carrier. Converted into an RF signal, therefore, for the receiving end (such as a TV or set-top box), the demodulated program is required to convert the received RF signal back to the corresponding composite video signal for reading from the composite video signal. Take out brightness information, chroma information, and sync information.

However, if there is distortion in the received RF signal, the subsequent RF signal may not be correctly converted back to the original composite video signal for subsequent demodulation procedures, thereby affecting subsequent image output.

Therefore, one of the main purposes of the present invention is to provide a television signal processing apparatus and a television signal processing method, which can reduce the distortion degree of a television signal before demodulation by processing a feedback signal obtained by demodulating a television signal. To solve the above problem.

According to an embodiment of the present invention, a television signal processing apparatus includes a first signal processing unit, a television demodulator, and a second signal processing unit. The first signal processing unit performs a first signal processing on a television signal according to a feedback signal to reduce distortion of the television signal to generate a processed television signal. The television demodulator is coupled to the first signal processing unit for receiving the processed television signal and demodulating the processed television signal to generate a demodulated television signal. The second signal processing unit is coupled to the first signal processing unit and the television demodulator for receiving the demodulated television signal and performing a second signal processing on the received demodulated television signal. The feedback signal is generated.

According to another embodiment of the present invention, a television signal processing method includes: performing a first signal processing on a television signal according to a feedback signal to reduce distortion of the television signal to generate a processed television signal. The processed television signal is subjected to a demodulation process to generate a demodulated television signal; and a second signal processing is performed on the demodulated television signal to generate the feedback signal.

Certain terms are used throughout the description and following claims to refer to particular elements. Those of ordinary skill in the art should understand that a manufacturer may refer to the same component by a different noun. The scope of this specification and the subsequent patent application do not use the difference of the names as the means for distinguishing the elements, but the difference in function of the elements as the criterion for distinguishing. The term "including" as used throughout the specification and subsequent claims is an open term and should be interpreted as "including but not limited to". In addition, the term "coupled" is used herein to include any direct and indirect electrical connection. Therefore, if a first device is described as being coupled to a second device, it is meant that the first device can be directly electrically connected to the second device or indirectly electrically connected to the second device by other means or connection means.

The inventive spirit of the present invention is to obtain a feedback signal according to a demodulated television signal (for example, a fundamental frequency signal conforming to an analog television specification), and to process one of the input television signals by referring to the information provided by the feedback signal (for example, The radio frequency signal conforming to the analog TV specification) aims to reduce the distortion of the television signal. The technical features of the present invention will be further described below in the following examples.

Please refer to FIG. 1. FIG. 1 is a functional block diagram of an embodiment of a television signal processing apparatus according to the present invention. In this embodiment, the television signal processing apparatus 100 can be disposed in a television or a set-top box, and includes, but is not limited to, a first signal processing unit 102, a television demodulator 104, and a second signal processing. Unit 106. The first signal processing unit 102 performs a first signal processing on a television signal S _IN (for example, an RF signal conforming to an analog TV specification) according to a feedback signal S _FB to reduce distortion of the television signal S _IN to generate a processing. After the TV signal S _IN '. The television demodulator 104 is coupled to the first signal processing unit 102 for receiving the processed television signal S _IN ', and performing a demodulation process on the processed television signal S _IN ' to generate a demodulated television signal S _CVBS (eg baseband signals conforming to analog TV specifications). The second signal processing unit 106 is coupled to the first signal processing unit 102 and the TV tuner 104 to demodulate the received television signal S _CVBS, and demodulation of the received television signal for a second signal S _CVBS Processing to generate the feedback signal S _FB to the first signal processing unit 102.

In this embodiment, the second signal processing unit 106 generates the feedback signal S _FB according to a delay amount DL and the demodulated television signal S _CVBS . For example, the second signal processing unit 106 is based on a preset level. The preset time corresponding to the length of the horizontal line (H-line) and the processing time of the first signal processing and the demodulation processing determine the delay amount DL, because the first signal processing and the The operation processing time required for the demodulation processing is determined and known when the circuit design of the first signal processing unit 102 and the television demodulator 104 is completed, so the operation processing time is a fixed value, and therefore, due to the pre- Both the set time and the operation processing time are fixed values, so the delay amount DL used by the second signal processing unit 106 may also be a fixed value.

Please refer to FIG. 2, which is a schematic diagram of a first implementation of the television signal processing apparatus shown in FIG. 1. In this embodiment, the television signal processing apparatus 200 implements an automatic gain control (AGC) unit 202 and a delay unit 206 to implement the first signal processing unit 102 and the second unit shown in FIG. 1, respectively. Signal processing unit 106. The delay unit 206 delays the demodulated television signal S _CVBS by the delay amount DL to generate a delayed television signal S _{CVBS_D} as the feedback signal S _FB , and the delayed television signal S _{CVBS_D} is used to indicate the television. The position of the sync tip of a horizontal scan line in signal S _IN . For example, the start position of the horizontal scan line in the delayed TV signal S _{CVBS_D} is substantially aligned with the start position of the horizontal scan line in the TV signal S _IN , for example, the corresponding M level in the TV signal S _{CVBS_D} after delay. The starting position of the scan line is substantially aligned with the start position of the corresponding Nth horizontal scan line in the TV signal S _IN , and if the delay amount DL is set to the preset time L corresponding to the preset horizontal scan line length, The difference between the first signal processing and the operation processing time T required for the demodulation processing (ie, DL=LT), the horizontal scanning line in the television signal S _{CVBS_D} and the horizontal scanning line in the television signal S _IN are delayed. The time interval between the horizontal scanning lines, in other words, M=N-1, so that the starting position of the corresponding (N-1) horizontal scanning lines in the television signal S _{CVBS_D} after the delay is substantially aligned with the television signal. S _IN corresponds to the starting position of the Nth horizontal scanning line. However, this is only an example and is not a limitation of the present invention. That is, in other embodiments, the delay amount DL may also be set to other fixed values. It still makes the delay No. _S CVBS_D video corresponding to M th horizontal scanning line starting positions substantially aligned with the television signal S _IN corresponding to the N-th horizontal scanning line starting position, but not for the case M N-1, for example to Said that M is equal to N, but the horizontal scan lines represented by the two are not part of the same field, for example, the start position of the Nth horizontal scan line corresponding to the X field in the delayed TV signal S _{CVBS_D} It will be substantially aligned with the starting position of the Nth horizontal scanning line corresponding to the Y field in the television signal S _IN , where X is not equal to Y (for example, Y=X+1).

In summary, as shown in FIG. 3, the television signal S _IN includes an Nth horizontal scanning line N ^th HL , an (N+1) ^th horizontal scanning line (N+1) ^th HL, and a (N+ 2) the horizontal scanning line (N+2) ^th HL, and the delayed television signal S _{CVBS_D} includes the Mth horizontal scanning line M ^th HL and the (M+1) horizontal scanning line (M+1) ^th HL and the (M+2) ^th horizontal scanning line (M+2) ^th HL, and their starting positions are respectively aligned with the Nth horizontal scanning line N ^th HL and the (N+1) ^th horizontal scanning line (N +1) ^th HL and the starting position of the (N+2) ^th horizontal scanning line (N+2) ^th HL .

In addition, the automatic gain control unit 202 applies only one gain to a single signal segment of a horizontal scan line in the television signal S _IN with reference to the feedback signal S _FB (ie, the delayed television signal S _{CVBS_D} ). For example, each scan line can be divided into a horizontal blanking interval and an active video portion, wherein the information in the horizontal blank segment is not displayed on the screen. For example, a sync tip is included in a horizontal blank section. If the signal of the sync header in the horizontal blank section is distorted (for example, the signal level of the sync header will be lower than the original signal level), the automatic gain control is _performed according to the sync header in the delayed TV signal S _{CVBS_D} . The unit 202 can know the position of the sync head of a horizontal scan line in the TV signal S _IN , and then the automatic gain control unit 202 detects the level of the signal segment corresponding to the sync head in the TV signal S _IN and applies a gain. The signal segment corresponding to the sync header is changed to change its signal level, thereby reducing the degree of distortion of the signal segment corresponding to the sync header. As shown in FIG. 3, for the same horizontal scan line, the automatic gain control unit 202 changes the level of the signal segment corresponding to the sync header, but does not change the level of the signal of the active video segment. Please note that since the automatic gain control unit 202 itself requires an arithmetic processing time, as shown in FIG. 3, there is a time difference between the output time of the processed television signal S _IN ' and the input time of the television signal S _IN .

Please refer to FIG. 4, which is a schematic diagram of a second implementation of the television signal processing apparatus shown in FIG. 1. In this embodiment, the television signal processing apparatus 400 implements the first signal processing unit 102 and the second unit shown in FIG. 1 by a pre-processing unit 402 and the delay unit 206 described above. Signal processing unit 106. Since the operation of the delay unit 206 has been described in detail above, it will not be further described herein. For the pre-processing unit 402, it will refer to the feedback signal S _FB (that is, the delayed TV signal S _{CVBS_D} ). Applying a plurality of different gains to different signal segments of the same horizontal scan line in the television signal S _IN , thus, compared to the automatic gain control unit 202 shown in FIG. 2 (which processes only a single signal region of each horizontal scan line) The pre-processing unit 402 has greater flexibility for the processing of the television signal S _IN and can generate a better signal output. For example, if the signal of the sync header in the horizontal blank section is distorted (for example, the signal level of the sync header will be lower than the original signal level), the other signal sections may be distorted. Therefore, according to the sync header in the delayed TV signal S _{CVBS_D} , the pre-processing unit 402 can know the position of the sync header of a horizontal scan line in the TV signal S _IN , and then the pre-processing unit 402 applies a gain to the synchronization. The signal segment corresponding to the head raises its signal level, thereby reducing the degree of distortion of the signal segment corresponding to the sync head, and other gains can be applied to other signal segments of the same scan line to appropriately adjust the signal level. In turn, the adjusted TV signal S _IN ' can be more similar to the originally undistorted TV signal.

In the embodiments shown in FIG. 2 and FIG. 4 above, the feedback signal S _FB is generated by directly delaying the demodulated television signal S _CVBS by using the delay amount DL. However, this is only used as an example. In fact, any signal that can be used to indicate the position of the sync head of a horizontal scan line in the television signal S _IN can be used as the feedback signal S _FB .

Please refer to FIG. 5, which is a schematic diagram of a third implementation of the television signal processing apparatus shown in FIG. 1. In this embodiment, the television signal processing device 500 implements the first signal processing unit 102 and the second signal processing unit 106 shown in FIG. 1 by using the automatic gain control unit 202 and an indication signal generating unit 502, respectively. . Since the operation of the automatic gain control unit 202 has been described in detail above, it will not be further described herein, and for the indication signal generating unit 502, it will be based on the synchronization header of each horizontal scanning line in the demodulated television signal S _CVBS . And the delay amount DL is used to generate a sync head indication signal S _SYNC as the feedback signal S _FB , and the sync head indication signal S _SYNC is used to indicate the position of the sync head of a horizontal scan line in the TV signal S _IN (eg, Figure 6 shows). Referring to the sync head indication signal S _SYNC shown in FIG. 6, it can be seen that the start position of the sync head indicated by the specific logic value (for example, "1") in the sync head indication signal S _SYNC is substantially aligned with the TV signal S _{IN .} The starting position of the horizontal scanning line. Similarly, based on the different delay amount DL setting, the sync head indicates the start position of the sync head of the sync head indicated by the specific logic value (for example, "1") in the signal S _SYNC and the horizontal scan line in the TV signal S _IN The time interval between the starting positions that differs by one or more horizontal scanning lines (for example, M=N-1, and the horizontal scanning lines represented by M and N-1 are in the same field; or M=N, but both The horizontal scanning lines represented belong to different fields), and the Nth horizontal scanning line of the television signal S _IN shown in FIG. 6 can be easily known by those skilled in the art according to the above description of FIG. N ^th HL, the (N+1) ^th horizontal scanning line (N+1) ^th HL and the (N+2) horizontal scanning line (N+2) ^th HL and the synchronization head indicating signal S _SYNC Relationship between M horizontal scanning lines M ^th HL , (M+1) horizontal scanning lines (M+1) ^th HL , and (M+2) horizontal scanning lines (M+2) ^th HL The detailed description will not be repeated here.

Please refer to FIG. 7. FIG. 7 is a schematic diagram of a fourth implementation manner of the television signal processing apparatus shown in FIG. 1. In this embodiment, the television signal processing device 700 implements the first signal processing unit 102 and the second signal processing unit shown in FIG. 1 by the pre-processing unit 402 and the instruction signal generating unit 502, respectively. 106. Since the operations of the pre-processing unit 402 and the indication signal generating unit 502 have been described in detail above, they will not be further described herein.

In the above embodiment, the delay amount DL adopted by the second signal processing unit 106 (for example, the delay unit 206 or the indication signal generating unit 502) is based on a preset time (fixed value) corresponding to the preset horizontal scanning line length and the The first signal processing and the processing time (fixed value) required for the demodulation processing are determined. However, the length of each horizontal scanning line in the television signal S _IN may not always be consistent, and may actually be subject to The length of the horizontal scanning line in the received television signal S _IN is changed by the signal transmission process or other factors.

Please refer to FIG. 8. FIG. 8 is a functional block diagram of another embodiment of the television signal processing apparatus of the present invention. In this embodiment, the television signal processing device 800 can be disposed in a television or a set-top box, and includes, but is not limited to, the foregoing first signal processing unit 102, the aforementioned television demodulator 104, and a rear device. A post-processing unit 802 and a second signal processing unit 806. Since the functions and operations of the first signal processing unit 102 and the television demodulator 104 have been described in detail above, they will not be further described herein. Compared with the second signal processing unit 106 shown in FIG. 1, the second signal processing unit 806 in FIG. 8 also receives the demodulated television signal S _CVBS and receives the demodulated television signal S _CVBS. The processing is performed. However, the second signal processing unit 806 determines the delay amount DL′ according to the actual time SL corresponding to the actual horizontal scanning line length provided by the post processing unit 802, and then delays the demodulation according to the delay amount DL′. The television signal S _CVBS generates a feedback signal S _FB ' to the first signal processing unit 102.

In this embodiment, the post-processing unit 802 is coupled to the TV demodulator 104 and the second signal processing unit 806 for estimating the actual time SL corresponding to the actual horizontal scan line length according to the demodulated television signal S _CVBS . (For example, the post processing unit 802 calculates an average value of the times corresponding to the plurality of horizontal scanning lines in the demodulated television signal S _CVBS to obtain the actual time SL required to determine the delay amount DL', and thereafter, The second signal processing unit 806 determines the delay amount DL' to be used based on the estimated actual time SL corresponding to the actual horizontal scan line length and the operation processing time required for the first signal processing and the demodulation processing, although The processing time required for the first signal processing and the demodulation processing is determined when the circuit design of the first signal processing unit 102 and the television demodulator 104 is completed (that is, the operation processing time is a fixed value) However, since the post-processing unit 802 based on the demodulated continually S _CVBS television signal to estimate the actual time of the actual horizontal scanning line SL corresponding to the length, therefore, each time the estimated SL is not the actual time is a preset fixed value, so that the delay amount DL 'actually change with the actual length of the horizontal scanning line constantly updated.

In short, regardless of the actual length of the horizontal scanning line in the demodulated television signal S _CVBS , the second signal processing unit 106 shown in FIG. 1 has a preset horizontal scanning line length corresponding to a preset. Time, however, in the embodiment shown in FIG. 8, the post processing unit 802 estimates the actual time corresponding to the length of an actual horizontal scanning line according to the demodulated television signal S _CVBS , and therefore, the second signal processing The feedback signal S _FB ' generated by the unit 806 can more accurately indicate the position of the sync head of a horizontal scan line in the television signal S _IN .

Similarly, for the television signal processing apparatus 800 shown in FIG. 8, the first signal processing unit 102 can be implemented by using the automatic gain control unit 202 or the pre-processing unit 402 described above, and the second signal processing unit 102 can also be implemented by using the foregoing delay unit 206 or the indication signal generating unit 502, wherein the manner of determining the delay amount DL' is different from the manner of determining the delay amount DL.

When at least the television demodulator 104 is implemented as a digital circuit, since the digital processing architecture employed is different from the circuit using the analog processing architecture, the operation time of the television demodulator 104 may be longer. The second signal processing units 106, 806 of the television signal processing apparatuses 100, 800 shown in Figs. 1 and 8 consider the operation processing time consumed by the television demodulator 104 to determine a delay amount DL, DL. Therefore, the feedback signals S _FB , S _FB ' generated by the second signal processing unit 106, 806 (which may also be a digital circuit) can still accurately indicate the synchronization head of a horizontal scanning line in the television signal S _IN The position of the corresponding sync header in the feedback signal S _FB , S _FB ' can still be aligned with the signal segment of the corresponding sync header in the TV signal S _IN in the time domain. However, this is for illustrative purposes only and is not a limitation of the present invention, that is, regardless of the components in the television signal processing device being implemented by digital circuits or analog circuits, any of the first and eighth figures are employed. A television signal processing device configured to reduce the distortion of television signals is within the scope of the present invention.

In addition, in the foregoing embodiment, the second signal processing unit may be implemented by a delay unit or an indication signal generating unit, however, any processed television signal may be distorted by processing the demodulated television signal output by the television demodulator. The information required to inform the signal processing mechanism of the first signal processing unit can be adopted by the second signal processing unit, and these design changes are within the scope of the present invention.

Figure 9 is a flow chart of the first embodiment of the television signal processing method of the present invention. The flow shown in Fig. 9 can be applied to the television signal processing apparatus 100 shown in Fig. 1, and if the substantially identical results are obtained, the steps are not necessarily performed in the order shown in Fig. 9. The operation of the first embodiment of the television signal processing method of the present invention can be summarized as follows: Step 902: Perform a first signal processing on a television signal according to a feedback signal to reduce the distortion of the television signal to generate a processed television. a signal: step 904: performing a demodulation process on the processed television signal to generate a demodulated television signal; step 906: performing a predetermined horizontal scanning line length and the first signal processing and the demodulation processing An operation processing time is used to determine a delay amount; and in step 908, a second signal processing is performed according to the delay amount and the demodulated television signal to generate the feedback signal.

FIG. 10 is a flow chart of a second embodiment of a television signal processing method according to the present invention. The flow shown in Fig. 10 can be applied to the television signal processing apparatus 800 shown in Fig. 8. Further, if substantially the same result is obtained, the steps are not necessarily performed in the order shown in Fig. 10. The operation of the second embodiment of the television signal processing method of the present invention can be summarized as follows: Step 1002: Perform a first signal processing on a television signal according to a feedback signal to reduce the distortion of the television signal to generate a processed television. a signal; step 1004: performing a demodulation process on the processed television signal to generate a demodulated television signal; step 1006: estimating a horizontal scan line length based on the demodulated television signal; step 1008: based on the horizontal scan a line length and an operation processing time required by the first signal processing and the demodulation processing to determine a delay amount; and a step 1010: performing a second signal processing according to the delay amount and the demodulated television signal to generate The feedback signal.

Since the skilled person can easily understand the operation details of the steps in FIG. 9 and FIG. 10 after reading the above technical contents of the television signal processing apparatus 100, 800, the related description does not require another Narration.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100, 200, 400, 500, 700, 800. . . Television signal processing device

102. . . First signal processing unit

104. . . Television demodulator

106, 806. . . Second signal processing unit

202. . . Automatic gain control unit

206. . . Delay unit

402. . . Pre-processing unit

502. . . Indicator signal generation unit

802. . . Post processing unit

S _IN . . . TV signal

S _IN '. . . TV signal after processing

S _CVBS . . . Demodulated TV signal

S _FB . . . Feedback signal

S _{CVBS_D} . . . Delayed TV signal

S _SYNC . . . Sync header indication signal

SL. . . Actual time corresponding to the actual horizontal scan line length

DL, DL’. . . Delay amount

FIG. 1 is a functional block diagram of an embodiment of a television signal processing apparatus according to the present invention.

Fig. 2 is a schematic diagram showing the first implementation of the television signal processing apparatus shown in Fig. 1.

Figure 3 is a schematic diagram of the TV signal, the processed TV signal and the delayed TV signal.

Figure 4 is a schematic diagram showing a second implementation of the television signal processing apparatus shown in Figure 1.

Fig. 5 is a schematic diagram showing a third implementation of the television signal processing apparatus shown in Fig. 1.

Figure 6 is a schematic diagram of the television signal, the processed television signal and the sync header indication signal.

Figure 7 is a schematic diagram showing a fourth implementation of the television signal processing apparatus shown in Figure 1.

Figure 8 is a functional block diagram of another embodiment of the television signal processing apparatus of the present invention.

Figure 9 is a flow chart of the first embodiment of the television signal processing method of the present invention.

FIG. 10 is a flow chart of a second embodiment of a television signal processing method according to the present invention.

100‧‧‧TV signal processing device

102‧‧‧First Signal Processing Unit

104‧‧‧TV demodulator

106‧‧‧second signal processing unit

S _IN ‧‧‧TV signal

S _IN '‧‧‧Processed TV signal

S _CVBS ‧‧‧Demodulated TV signal

S _FB ‧‧‧Response signal

Claims (20)

A television signal processing apparatus includes: a first signal processing unit that performs a first signal processing on a television signal according to a feedback signal to reduce distortion of the television signal to generate a processed television signal; The demodulator is coupled to the first signal processing unit for receiving the processed television signal, and performing a demodulation process on the processed television signal to generate a demodulated television signal; and a second signal processing The unit is coupled to the first signal processing unit and the television demodulator for receiving the demodulated television signal, and performing a second signal processing on the received demodulated television signal to generate the feedback Signal to the first signal processing unit. The television signal processing device of claim 1, wherein the second signal processing unit generates the feedback signal according to a delay amount and the demodulated television signal. The television signal processing device of claim 2, wherein the second signal processing unit is a delay unit, and the delay unit delays the demodulated television signal by the delay amount to generate a delayed television signal. The feedback signal is used to indicate the position of the synchronization head of a horizontal scanning line in the television signal. The television signal processing device of claim 2, wherein the second signal processing unit is an indication signal generating unit, and the indication signal generating unit is configured according to each horizontal scanning line of the demodulated television signal. The sync header and the delay amount are used to generate a sync header indication signal as the feedback signal for indicating the position of the sync header of a horizontal scan line in the television signal. The television signal processing device of claim 2, wherein the second signal processing unit is configured according to a predetermined horizontal scanning line length corresponding to the preset time and the first signal processing and the demodulation processing One of the processing time is required to determine the amount of delay. The television signal processing device of claim 2, further comprising: a post processing unit coupled to the television demodulator and the second signal processing unit for using the demodulated television The signal is used to estimate an actual time corresponding to an actual horizontal scan line length; wherein the second signal processing unit is based on the actual time corresponding to the actual horizontal scan line length and the first signal processing and the demodulation processing required One of the processing time is used to determine the amount of delay. The television signal processing device of claim 1, wherein the first signal processing unit is an automatic gain control unit for applying only one gain to the horizontal scanning of the television signal with reference to the feedback signal. A single signal segment in the line. The television signal processing device of claim 1, wherein the first signal processing unit is a pre-processing unit for applying a plurality of different gains to the same in the television signal with reference to the feedback signal. Different signal segments of the horizontal scan line. The television signal processing device of claim 1, wherein at least the television demodulator is a digital circuit. The television signal processing device of claim 1, wherein the television signal conforms to an analog television specification. A television signal processing method includes: performing a first signal processing on a television signal according to a feedback signal to reduce distortion of the television signal to generate a processed television signal; and demodulating the processed television signal Processing to generate a demodulated television signal; and performing a second signal processing on the demodulated television signal to generate the feedback signal. The method for processing a television signal according to claim 11, wherein the step of performing the second signal processing on the demodulated television signal to generate the feedback signal comprises: according to a delay amount and the demodulated television Signal to generate the feedback signal. The method for processing a television signal according to claim 12, wherein the step of generating the feedback signal according to the delay amount and the demodulated television signal comprises: delaying the demodulated television signal by the delay amount A delayed television signal is generated as the feedback signal for indicating the position of the sync head of a horizontal scan line in the television signal. The method for processing a television signal according to claim 12, wherein the step of generating the feedback signal according to the delay amount and the demodulated television signal comprises: according to each horizontal scan in the demodulated television signal The sync header of the line and the delay amount generate a sync header indication signal as the feedback signal for indicating the position of the sync header of a horizontal scan line in the television signal. The method for processing a television signal according to claim 12, further comprising: a preset time corresponding to a preset horizontal scanning line length, and the first signal processing unit and one of the demodulation processing requirements The processing time is determined to determine the amount of delay. The method for processing a television signal according to claim 12, further comprising: estimating an actual time corresponding to an actual horizontal scanning line length according to the demodulated television signal; and based on the actual horizontal scanning line length The one of the first signal processing and the one of the processing time required for the demodulation processing is determined by the actual time corresponding to the actual time. The method for processing a television signal according to claim 11, wherein the first signal processing is an automatic gain control for applying only one gain to a horizontal scanning line of the television signal with reference to the feedback signal. A single signal segment. The method of processing a television signal according to claim 11, wherein the first signal processing is a pre-processing for applying a plurality of different gains to the same horizontal scanning of the television signal with reference to the feedback signal. Different signal segments of the line. The television signal processing method according to claim 11, wherein at least the demodulation processing is performed in a digital manner. The television signal processing method of claim 11, wherein the television signal conforms to an analog television specification.