KR20000007324A - Method for automatically setting sound system - Google Patents

Abstract

PURPOSE: A method for setting a sound system is provided to simplify a system construction for planning economical efficiency and to set the sound system automatically according to the color system of a received broadcasting signal for using conveniently. CONSTITUTION: A method for setting a sound system includes; operating an automatic channel searching after being fed with a key input signal of a user for selecting a channel; tuning the broadcasting signal of a corresponding channel by a channel selecting signal from a controlling unit(26) for transforming to an IF signal and outputting to the IF and a chroma processor(24); and checking the vertical frequency of the received image signal in a color system detecting instrument for supplying an information about the color system to the controlling unit.

Description

Sound type automatic setting method

The present invention relates to a method for automatically setting the sound system of a broadcast signal received by an intercarrier TV receiver having a multi-TV system function.

In general, a multi-TV system function refers to a TV system that allows a user to receive and signal-process a plurality of broadcasts having different broadcasting systems (including a color system and a sound system). . In addition, the intercarrier system refers to a method of amplifying a video signal and an audio signal with the same intermediate frequency amplifier and then separating the two signals by different detection. Currently, TV receivers generally used are mostly intercarrier type, and even if the local oscillation frequency is fluctuated, the intermediate frequency of voice is always constant, so there is an advantage of preventing the distortion of the voice or the inaudible phenomenon.

Meanwhile, an intercarrier TV receiver having a multi-TV system function (hereinafter referred to as an "inter-carrier multi-TV receiver") is a broadcasting method of a specific channel selected by a user from among broadcasting signals having different broadcasting methods. Therefore, the signal processing of the received sound signal is possible only by setting the sound system of the sound circuit. A related art sound method setting method of the TV receiver will be described with reference to FIG. 1.

Referring to FIG. 1, the conventional intercarrier type multi-TV receiver designates (presets) a default sound method as an option value mapped to each sound method at the time of shipment from the factory.

Therefore, in the conventional intercarrier type multi-TV receiver, when channel automatic search is performed by the user's key input signal (step 10), the designated option value is checked to determine the sound system of the preset system (steps 12a to 12). Step 12d). For example, if the option value is "0", set the sound system to "B / G" (step 14a); if the option value is "1", set the sound system to "D / K" (step 14b). If the option value is "2", the sound system is set to "I" (step 14c), and if the option value is "3", the sound system is set to "M" (step 14d).

The above-described multi-TV receiver outputs a sound method corresponding to one option value designated as an initial value to the current system among the above-described option values to the corresponding sound port (step 16), and outputs an external sound system according to the output sound method. The sound filter of the sound filters is activated.

However, in the conventional multicarrier receiver of the conventional intercarrier type, if the sound method of the currently received broadcast signal is different from the sound method set in the system initially, the sound signal is not reproduced and the user resets the sound method of the current reception channel. There is a problem that must be done.

An object of the present invention for solving this problem is to set and automatically recognize the sound system corresponding to the broadcast signal currently received by the system without pre-setting the initial sound system of each system in an intercarrier multi-TV receiver. It provides a method for doing so.

1 is a flowchart illustrating a conventional sound method setting method;

2 is a block diagram showing an apparatus to which the automatic method of sound system setting according to the present invention is applied;

3 is a flowchart showing a method for automatically setting a sound method according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

20 tuner 24 IF and chroma processor

26: control unit 28: sound filter unit

The sound system automatic setting method of the present invention for achieving the above object is a method for automatically setting the sound system of a broadcast signal received from an intercarrier TV receiver having a multi-TV system function, (1) Determining a color scheme of a received broadcast signal; (2) setting a sound method corresponding to the determined color method; And (3) restoring the sound intermediate frequency signal by sound filtering the composite video signal of the broadcast signal received according to the set sound method.

Hereinafter, with reference to the accompanying Figures 2 to 3 will be described in detail a preferred embodiment according to the present invention.

Referring to FIG. 2, the controller 26 applies a pre-international language signal (not shown) to the tuner 20 in response to a key input signal for selecting a channel of a user. The tuner 20 tunes the broadcast signal of the channel corresponding to the pre-international language signal from the control unit 26 and converts it into an intermediate frequency (IF) signal. The IF and chroma processor 24 amplify and detect the IF signal from the tuner 20, restore the composite video signal, and separate it into a video signal and a sound signal. This video signal is displayed on the screen as a reproduced video signal through a predetermined signal processing process by a chroma processor. Not shown color detection means is a well-known technique, built in the IF and the chroma processor 24, depending on what the vertical frequency of the broadcast signal is the color signal of the received broadcast signal NTSC method PAL method or SECAM method Determine if it is.

On the other hand, the control unit 26 sets the sound mode to "M" to the M sound port if the color method of the broadcast signal of the currently received channel is NTSC method as a result of the color method discrimination from the above-described color method detection means. Output In addition, the control unit 26 sets the sound system corresponding to the currently received channel for all of the "B / G, D / K, I" when the above-described color system is not NTSC system, that is, PAL or SECAM system. To output each sound method port to each sound method port. A plurality of sound type sound filters provided in the sound filter unit 28 are each supplied with a composite video signal CVBS from an IF processor, and the corresponding sound filters are enabled according to the sound type port output from the control unit 26. Then, the above-described composite video signal is sound filtered to output a sound intermediate frequency signal SIF.

The operation of the apparatus of FIG. 2 having such configurations will be described in detail with reference to FIG. 3. Referring to FIG. 3, first, when a user's key input signal for channel selection is applied, the control unit 26 performs channel auto search in response to this (step 30). The tuner 20 tunes the broadcast signal of the channel according to the channel tuning signal from the control unit 26, converts the broadcast signal into an IF signal, and outputs the IF signal to the IF and chroma processor 24. The color system detecting means provided in the IF and the chroma processor 24 checks the vertical frequency of the received video signal and supplies the control unit 26 with information related to the color system.

The control unit 26 analyzes the relevant information from the color system detecting means and determines whether or not the color system of the broadcast signal of the currently received channel is the NTSC system (step 32). As a result of the determination, the control unit 26 sets the "M" method as the sound method for the sound signal of the currently received channel if the NTSC method (step 34), and the sound method for the sound signal of the currently received channel if the NTSC method is not. All or part of the " B / G, D / K, I " scheme is set (step 36). Here, the reason for setting the sound system according to whether the color system is NTSC system or not is that the NTSC system and PAL system or NTSC system and SECAM system affect each other by the signal band format. This is because the signal band formats do not affect each other. The control unit 26 outputs these set sound schemes through each sound port (step 38). For example, if the set sound method is "M", the control information related to this method is output through the M port. If the set sound method is "B / G, D / K, I", the control information related to these methods is displayed. Outputs through B / G port, D / K port and I port respectively.

The plurality of sound filters 28 preset for each sound system are enabled by the M sound filter 28a when the sound system supplied from the control unit 26 is the M system, and performs sound filtering on the composite video signal from the IF processor. Output as sound intermediate frequency signal (SIF). If the sound system supplied from the control unit 26 is the B / G system, the D / K system, and the I system, the B / G sound filter 28b, the D / K sound filter 28c, and the I sound filter 28d may be used. All of them are enabled, and among these filters, only the filter that matches the sound system of the composite video signal from the above-described IF processor is sound filtered and output as a sound intermediate frequency signal.

Meanwhile, other embodiments than the preferred embodiment shown in FIGS. 2 and 3 may be implemented in a modified form based on the above-described technical gist. For example, when the color scheme determined in the embodiment of FIG. 3 is not NTSC, only B / G and D / K may be set or another sound scheme dependent on the PAL scheme and the SECAM scheme may be added. This can be set differently according to product specifications according to the broadcasting method of the region using the multi-TV receiver. In addition, it is also possible to determine the color scheme and to set a sound scheme corresponding to each of the determined color schemes. Meanwhile, in the embodiment of FIG. 2, the color type detection of the broadcast signal received may be performed by the color type detector or may be performed by the controller 26. This can be modified in many ways in design in terms of efficiency and economics of control over system implementation. In addition, the present invention employs a signal processing unit related to a multi-broadcasting method such as a VTR and a multi-broadcasting method such as a multi-PC having a TV card and a satellite broadcasting receiver, and a video device capable of receiving and signal-processing, not a multi-TV receiver. The technical gist of the present invention can be implemented.

As described above, the intercarrier multi-TV receiver according to the present invention analyzes a broadcast signal of a received channel to determine a color scheme, and automatically sets a corresponding sound scheme based on the received sound signal of the received channel. Play back correctly. Thus, the present invention achieves economical efficiency by simplifying the system configuration compared with the prior art, and has an effect of providing convenience for the user by automatically setting the sound method according to the color method of the received broadcast signal.

Claims (2)

A method for automatically setting the sound system of a broadcast signal received by an intercarrier TV receiver having a multi-TV system function, (1) determining a color scheme of a received broadcast signal; (2) setting a sound method corresponding to the determined color method; And And (3) restoring the sound intermediate frequency signal by sound filtering the composite video signal of the broadcast signal received according to the set sound method. The method of claim 1, wherein the determined color scheme Sound system automatic setting method characterized in that the sound system is set to "M" if the NTSC method, "B / G, D / K, I" if the NTSC method is not.