KR100514324B1 - How to adjust color saturation level by TV system - Google Patents

Abstract

According to the present invention, a method for adjusting color saturation of a multi-TV receiver according to the present invention includes appropriately setting different default values for color saturation adjustment for each broadcasting method, determining a broadcasting method of a received broadcast signal, and determining a color saturation level as a corresponding default value. By performing the adjustment, it is possible to maintain a constant color saturation level irrespective of the broadcast method, thereby providing improved image quality. In addition, the present invention automatically sets a constant color saturation level regardless of the broadcasting method by presetting default values for color saturation adjustment for each broadcasting method according to the hardware characteristics of the one-chip IC when upgrading the one-chip IC related to the color signal processing block. To provide. Accordingly, the present invention provides a designer with convenience in design that does not require the user to individually adjust related hardware, and the user does not need to adjust color saturation by key operation every time the user watches a different broadcasting system. To provide convenience.

Description

How to adjust color saturation level by TV system

The present invention relates to a method of adjusting color saturation for each broadcasting method of a TV receiver capable of receiving and processing broadcast signals according to different broadcasting methods, and in particular, a broadcast received by setting different default values for color saturation adjustment for each broadcasting method. A method of adjusting the color saturation of a signal.

Color saturation is one of the measures for quantitatively expressing color in a color TV receiver, and represents the degree of darkness of the same color among the color signals separated from the composite video signal.

In general, an apparatus for adjusting color saturation in a color TV receiver of an NTSC broadcasting system is located between a band pass amplifier circuit and a demodulation circuit in a color signal processing block. The band pass amplifier circuit separates the color signal by amplifying a predetermined band in which the color signal is located among the input composite video signals. Further, the demodulation circuit demodulates the color difference signal using the color signal from the band pass amplification circuit and the color part carrier wave from the color synchronization circuit. Here, the color saturation adjustment device adopts a variable resistor to adjust the output level of the band pass amplification circuit (gain adjustment) to supply the demodulation circuit to adjust the color saturation. This is because in NTSC, the intensity of the color corresponds to the magnitude of the amplitude of the color signal.

Recently, TV receivers (hereinafter referred to as' multi-TV receivers') capable of receiving and signal-processing all broadcast signals according to different broadcast methods ('TV SYSTEM' or 'COLOR SYSTEM) have been developed and are being distributed. This multi-TV receiver implements a color signal processing block in one integrated circuit (IC) and is controlled by a microcomputer.

Referring to FIG. 1, which shows a conventional color saturation adjustment method, when the microcomputer enters the color saturation adjustment mode while performing a main routine (step 10) in the TV set, the user's key operation is performed at the factory default color saturation default value. A color saturation adjustment value is calculated by adding the user adjustment value accordingly (step 12), and the color saturation adjustment value is supplied to the color saturation adjustment circuit of the chroma processor (step 14). As a result, the color saturation adjustment circuit adjusts the color saturation of the input video signal.

However, the color saturation adjustment method of the above-described multi-TV receiver has a color gain for color saturation for each broadcasting system due to the circuit characteristics of the one chip implementing the above-described chroma processor or the version upgrade of the IC. There is a problem that occurs when) is different. In addition, conventionally, since the color saturation is set to be the same regardless of the broadcast method, there was no special method to compensate for the above-mentioned problem. Thus, when a user watches a different broadcast method with the same TV receiver, the user manually There is a problem that the color saturation must be adjusted.

An object of the present invention for solving the above-described problems, by setting the color saturation default value differently for each broadcasting method in the multi-TV receiver by adjusting the color saturation of the received broadcast signal is maintained constant regardless of the broadcasting method The present invention provides a method of adjusting color saturation.

Color saturation adjustment method of the present invention for achieving the above object, a method for adjusting the color saturation (saturation) of the broadcast signal received from a TV receiver capable of receiving and signal processing the broadcast signals of different broadcast methods (1) a step of differently setting the above-described default value for each broadcasting method from a color saturation adjustment range consisting of a default value and a user adjustment value; (2) determining a broadcasting method of the received broadcast signal at every channel switching according to a user's channel key operation; And (3) adjusting the color saturation of the received broadcast signal as a default value corresponding to the above-described determined broadcast method among the preset default values, and when a user adjustment value according to a user's key operation is input, the default value of the above-described default value is adjusted. Adding to adjust the color saturation.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 2 and 3.

Referring to FIG. 2, the controller 20 pre-stores default values for adjusting color saturation mapped for each broadcasting scheme. In addition, when a channel key signal according to a user's key operation is applied, the control unit 20 applies a pre-international language signal for tuning the corresponding channel to a tuner (not shown), and transmits to the broadcast method information from the broadcast method discriminator 24. The corresponding color saturation default value is read out of the previously stored default values and applied to the color saturation adjustment section 26 together with the associated control signal. In addition, when a user adjustment value for color saturation adjustment according to a user's key operation is applied, the control unit 20 adds the color saturation adjustment value obtained by adding the user adjustment value to the currently set default value and the related control signal. Is applied.

The tuner, not shown, tunes a broadcast signal of a channel corresponding to the pre-international language signal from the control unit 20 and converts it into an intermediate frequency signal IF. An intermediate frequency processor (not shown) detects and amplifies the intermediate frequency signal from the tuner and restores the composite image signal.

The broadcast method discriminator 24 detects information related to the broadcast method among the composite video signals from the intermediate frequency processor to determine the broadcast method of the broadcast signal currently received. The broadcast method discrimination unit 24 may be implemented in various ways according to a method of detecting information related to a broadcast method. The first method detects the vertical frequency information among the synchronization signals of the input broadcast signal to determine the broadcast method. If the detected vertical frequency is 60 kHz, it is determined by NTSC broadcasting. If the detected vertical frequency is 50 kHz, it is determined by PAL or SECAM. The second method is to broadcast by detecting the oscillation frequency of frequency and phase of the burst signal of the currently received broadcast signal among the various frequency oscillators related to the color subcarriers included in the color synchronization processing block of the multi-TV receiver. Determine the method. The broadcast method discrimination unit 24 according to the present invention may implement the above-described detection methods respectively or in combination with each other, which may be selected according to the region or system specification in which the multi-TV receiver is used.

The band pass amplifier 22 separates the color signal components by amplifying the band where the color signal components are located among the composite image signals from the intermediate frequency processor. The color saturation adjustment unit 26 adjusts the color saturation of the broadcast signal currently received by adjusting the color signal level from the band pass amplifier 22 according to the color saturation adjustment value supplied from the control unit 20 and the related control information. The color difference demodulation section 28 processes the color part carriers and the color saturation adjustment color signal of the color saturation adjustment section 26 from the color synchronization processing block (not shown) to demodulate the color difference signal.

The operation of the apparatus of FIG. 2 having such configurations will be described in detail with reference to FIG. 3. 3 shows a control flow diagram related to the technical gist of the present invention during the control operation of the control unit 20 included in the device of FIG. 2.

First, the technical gist of the present invention sets a default value for color saturation adjustment differently for each broadcasting method, and the controller 20 of the multi-TV receiver determines the broadcasting method of the received broadcast signal and currently receives the corresponding broadcasting value as the default value corresponding thereto. The control is to set the color saturation of the signal. Here, the default values differently set for each broadcasting method are set at the factory so that the desired color saturation level is kept constant regardless of the broadcasting method according to the circuit characteristics and related conditions of the color signal component processor implemented by the one-chip IC. More specifically, it is preferable that the default values mapped differently for each broadcasting method are set to NCR (NTSC COLOR GAIN) for NTSC broadcasting and to PCR (PAL COLOR GAIN) for PAL or SECAM broadcasting instead of NTSC broadcasting. This is because, in general, the PAL method and the SECAM method have similar color signal processing methods, so that an error of color gain for color saturation between the two methods is included in the tolerance range.

Meanwhile, as another embodiment, the default color saturation values may be differently set for the PAL method and the SECAM method, and accordingly, the color flow rate may be more precisely modified by appropriately modifying the control flow diagram of FIG. 3.

When a key input signal according to a user's channel selection key operation is applied, the control unit 20 applies a pre-international language signal for tuning the channel to a tuner (not shown). The tuner tunes the corresponding channel to an IF signal according to the applied international language signal, and the intermediate frequency processor detects and amplifies the IF signal from the tuner to generate a composite video signal. The broadcast method discriminator 24 detects information related to the broadcast method among the composite video signals from the IF processor to determine the broadcast method of the currently received broadcast signal, and supplies the discrimination information to the control unit 20.

The control unit 20 checks whether the color saturation adjustment mode is performed while controlling the overall configuration of the multi-TV receiver, that is, performing a main routine for receiving and processing broadcast signals according to various broadcasting methods (step 30). . When the channel selection key is applied or a user adjustment value for color saturation adjustment is applied, the control unit 20 determines the color saturation adjustment mode, checks the discrimination information from the broadcast method discrimination unit 24, and displays the currently received broadcast signal. It is determined whether the NTSC broadcast system (step 32). The control unit 20 returns to the main routine if it is not in the color saturation adjustment mode. As a result of the determination in step 32, if the NTSC broadcast method, the control unit 20 reads the NCR from among the preset default values, and if the user adjustment value is applied, the color saturation adjustment unit 26 adds the color saturation adjustment value and related control signals added to the NCR. (Step 34a and step 36). As a result of the determination in step 32, if it is not an NTSC broadcasting method, the control unit 20 reads the PCR among preset default values, and if the user adjustment value is applied, the color saturation adjustment value and related control signals added to the PCR are added to the color saturation adjustment unit ( 26) (step 34b and step 36). When step 36 ends, the control unit 20 returns to the main routine.

The color saturation adjustment unit 26 gain-adjusts and outputs the color signal level from the band pass amplifier 22 in accordance with the color saturation adjustment value from the control unit 20 and the associated control signal. Here, the color saturation adjustment unit 26, since the default value for color saturation adjustment supplied from the control unit 20 varies depending on the broadcasting method, by adjusting the color gain of the band pass amplifier 22 differently according to the broadcasting methods. Regardless of the broadcasting method, color signals having the same color saturation level are supplied to the color difference demodulator 28. As a result, the color difference demodulation unit 28 demodulates the color difference signal by signal-processing the constant color signal level from the color saturation adjustment unit 26 and the color subcarrier from the separate color synchronization processing block.

As described above, one of ordinary skill in the art may easily implement other embodiments of the above-described modifications of FIGS. 2 and 3 based on the technical gist of the present invention.

As described above, in the method of adjusting the color saturation for each broadcasting method of the multi-TV receiver according to the present invention, the default values for color saturation adjustment are preset differently for each broadcasting method and the corresponding default values are determined by determining the broadcasting method of the received broadcast signal. Color saturation adjustment is performed to maintain a constant color saturation level regardless of the broadcasting method, thereby providing a more improved image quality. In addition, the present invention automatically provides a constant color saturation level regardless of the broadcasting method by presetting different default values for color saturation adjustment for each broadcasting method according to the hardware characteristics of the one-chip IC. It provides designers with the convenience of design that does not need to adjust the related hardware one by one, and it provides the user with the convenience of not having to adjust color saturation by key operation whenever watching broadcasting with different broadcasting method. .

1 is a flowchart illustrating a conventional method of adjusting color saturation;

2 is a block diagram showing an apparatus to which a method for adjusting color saturation of a broadcasting system of a TV receiver according to the present invention is applied;

3 is a flowchart illustrating a method of adjusting color saturation for each broadcasting method of a TV receiver according to the present invention.

<Description of Symbols for Main Parts of Drawings>

20: control unit 22: band pass amplifier

24: broadcasting system discrimination unit 26: color saturation adjustment unit

28: color difference demodulation unit

Claims (2)

In the method for adjusting the color saturation (color saturation) of the broadcast signal received by the TV receiver capable of receiving and signal processing the broadcast signals of different broadcast methods, (1) presetting the default value of the color saturation adjustment range consisting of a default value and a user adjustment value differently for each broadcasting scheme; (2) determining a broadcasting method of a currently received broadcast signal tuned at each channel switching according to a user's channel key operation; And (3) Adjust the color signal level of the received broadcast signal as a default value corresponding to the determined broadcast method among the preset default values, and if a user adjustment value according to a user's key operation is input, add the color signal level to the default value. And adjusting the color saturation by adjusting the color saturation degree for each broadcasting system of the TV receiver. The method of claim 1, wherein step (1) comprises The NTSC method is set to NCR (NTSC COLOR GAIN), and the PAL method and SECAM method are set to PCR (PAL COLOR GAIN), and the NCR and PCR are configured to maintain a constant color saturation level regardless of a broadcasting method. A method of adjusting color saturation for each broadcasting system of a TV receiver, which is appropriately set.