KR19990031135A - Channel Memory Method According to Receiving Sensitivity during Automatic Channel Search of VSI System - Google Patents

Abstract

The present invention relates to a channel memory method according to reception sensitivity during automatic channel search of a VSI system. When the automatic channel search mode is set, a synchronization sensitivity used for channel search is used on an OSD screen by using the AFT value of a channel currently being broadcast. It is possible to prevent the weak signal reception channel from being stored by allowing the user to set arbitrarily and, if the sensitivity is changed within a specified time, to execute the automatic channel search mode by storing the upper and lower limits of the changed sensitivity.

To this end, when the automatic channel search mode is set, the present invention provides a first step of waiting for a key input while executing an AFT of a channel currently being broadcast and outputting a synchronization sensitivity level that is an optimal point and a message capable of changing the synchronization sensitivity; A second step of storing an upper limit value and a lower limit value of the changed synchronization sensitivity level when the synchronization sensitivity is changed within the time designated in the first step; And a third step of repeatedly performing the operation of automatically channel searching based on the level of synchronization sensitivity memorized in the second step so as to memory only a channel whose synchronization sensitivity is within a prescribed value until the last channel.

Description

Channel Memory Method According to Receiving Sensitivity during Automatic Channel Search of VSI System

The present invention relates to a VSI system having a function of automatically deleting a weak signal when searching for an automatic channel. More specifically, when an automatic channel search mode is set, the present invention performs automatic fine tuning (hereinafter referred to as AFT) of a channel currently being broadcast. If the synchronization sensitivity is changed by the user within the designated time while waiting for key input while outputting a message that can change the sensitivity, the synchronization sensitivity level that is the optimum point is stored, and then the upper and lower limits of the sensitivity level are memorized. By selectively storing only the channels where synchronization sensitivity within the specified value is detected during the search, you can set the sensitivity to the channel according to the user's intention, and then automatically search the channel according to the sensitivity. VSI system prevents weak channels from being memorized Automatic channel search during relates to a channel memory method according to the reception sensitivity.

In general, in order to perform the automatic channel fitting function, the conventional VSI includes a phase locked loop (PLL) IC, a frequency tuning circuit, a local oscillator, a frequency synthesis circuit, and the like, through the antenna as in the embodiment of FIG. A tuner circuit for selecting a desired channel from the signal by a frequency tuning voltage, an RF modulation circuit for converting and outputting a signal suitable for a TV cathode ray tube, and an intermediate frequency (IF) for a broadcast signal from a channel selected by the tuner circuit And an RF / tuner / IF section 10 configured as an IF detection circuit for detecting a.

Then, the video signal is separated from the IF output signal of the RF / tuner / IF unit and provided to the microprocessor, and the desired video signal and audio signal are respectively processed and output to the head and line output terminals of the deck unit 60. The audio signal processing unit 20 is included.

Then, the PLL IC of the tuner circuit is controlled to output a frequency tuning voltage while detecting the presence / absence of a video synchronization signal output from the video / audio signal processing unit 20 to determine the presence / absence of a broadcasting channel signal, and to determine a desired channel. If this is selected, the microprocessor 70 is configured to perform the channel tuning operation by setting the optimum tuning voltage by automatic fine tuning (AFT).

In addition, a key input unit 40 for interfacing the microprocessor and the user, an OSD processing unit 30 for generating a character according to the OSD control signal of the microprocessor and supplying it to a video signal output terminal, and storing channel data, etc. It comprises a memory unit 50 for.

The conventional automatic channel matching operation performed in VSI of this configuration is performed by pressing the function selection key provided on the remote control or the set. Is displayed in the OSD screen, such as "I am automatically adjusting the channel now", starting with channel "2" and moving up one channel at a time. It is programmed.

That is, the microprocessor 70 checks the key input unit to determine whether a function selection key is input, and when the function selection key is pressed, "clock alignment", "scheduled recording / cancel" or "channel alignment" as shown in Table 1 below. Or "Other Functions", etc. A function selection guide screen is displayed on the OSD, and the user waits for a selection operation.

** Function selection ** 1. Custom Clock 2. Reservation recording / cancellation 3. Channel Customization 4. Other Functions 1-4 Selection Function Selection End

At this time, if "3" is input from the digit key of the key input part by user, again "Antenna input" or "general broadcast" and "general broadcast → cable broadcasting" or "automatic channel alignment" or "manual" as shown in Table 2 below. The channel alignment screen for selecting "channel alignment" is displayed, and the user waits for selection again.

** Channel Customization ** Antenna Input General Broadcast 1. General broadcasting → Cable broadcasting 2. Auto Channel Fit 3. Manual Channel Alignment 1-3 Select Function End

In the channel alignment guide screen display state, the microprocessor 70 checks the key operation state again as shown in the operation flowchart of FIG. 2 to determine whether to select the automatic channel alignment mode (S21), and at this time, the user digits of the key input unit. Press the key "2" to select the automatic channel matching mode (Y branch of S21) to set the initial channel value for automatic channel search to "2" (S22) to execute the corresponding channel search operation (S23), broadcast signal (Y branch of S24), the channel is stored in the memory unit 50 (S25), and the channel number is increased by " 1 "

However, in the VSI system having the automatic channel matching function, when the automatic channel search mode is executed, the microprocessor performs the synchronous search to store all channels whose synchronization of the received signal is the weak field. There was a problem such as having to find one by one.

Accordingly, the present invention has been made to solve the above problems, and the present invention is capable of changing the synchronization sensitivity and its synchronization sensitivity, which are optimal points, by executing automatic fine tuning of the currently broadcast channel when the automatic channel search mode is set. If the sensitivity is changed by the user within a certain time while waiting for a key input while a message is output, or if the stop key is changed, the automatic channel search mode is executed by memorizing the upper and lower limits of the changed synchronization sensitivity. By selecting and memorizing only the channels where the synchronization sensitivity is detected, it is possible to adjust the reception sensitivity of the memorable channel according to the user's intention in the automatic channel search, and to freely select how much to memorize the channel. Enable automatic channel discovery It is an object of the present invention to provide a channel memory method according to reception sensitivity.

In order to achieve the above object, according to the present invention, when the automatic channel search mode is set, the AFT of the currently broadcasting channel is executed to wait for key input while outputting a synchronization sensitivity level that is an optimal point and a message that can change the synchronization sensitivity. First step; A second step of storing an upper limit value and a lower limit value of the changed synchronization sensitivity level when the synchronization sensitivity is changed within the time designated in the first step; The automatic channel search of the VSI system comprising the third step of repeatedly executing the automatic channel search based on the synchronization sensitivity level stored in the second step to memory only the channel whose synchronization sensitivity is within the prescribed value until the last channel. A channel memory method according to reception sensitivity is provided.

Figure 1 is a block diagram showing a part of the configuration of the general VSI system

2 is a flowchart illustrating an automatic channel search mode of a conventional VSA system.

3 is a flowchart illustrating an automatic channel search mode of a BS system according to the present invention.

** Explanation of symbols for the main parts of the drawings **

10: RF / tuner / IF unit 20: video / audio signal processing unit

30: OSD processing section 40: key input section

50: memory 60: deck

70: microprocessor

Hereinafter, a channel memory method according to a reception sensitivity at the time of automatic channel discovery of a VSI system according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a flowchart illustrating the overall control process of the present invention in which only a channel having a desired reception sensitivity is selectively memorized when the automatic channel search mode is executed. When the automatic channel search mode is set, the AFT of the currently broadcast channel is executed. A first step (S311-S315) of waiting for key input while outputting a message capable of changing the synchronization sensitivity level and the synchronization sensitivity which becomes the optimum point; and if the synchronization sensitivity is changed within the time specified in the first step, the changed synchronization A second step (S316) of storing the upper and lower limits of the sensitivity level, and automatic channel searching based on the synchronization sensitivity level stored in the second step to store only the channel for which the synchronization sensitivity within a predetermined value is detected. Automatic channel search time of VSI system consisting of the third step (S317-S322) which is repeatedly executed to the last channel. It indicates a channel memory method according to the sensitivity.

That is, the first step is performed when the automatic channel search mode is set, requesting input of the channel number currently being broadcast (S312), and executing AFT of the corresponding channel while checking whether the synchronization sensitivity is an optimal point. (S313), and if the optimum point is found, outputting a message capable of changing the synchronous sensitivity level and the synchronous sensitivity which becomes the optimum point (S314), and whether the synchronous sensitivity change stop key is input or a specified time has elapsed. In step S315, the user waits for a key input while checking.

The second step is a step (S316) of checking that the synchronous sensitivity is changed within the time specified in the first step and storing the changed upper and lower limits of the synchronous sensitivity level.

In the third step, the automatic channel search is executed from the low channel based on the synchronization sensitivity level stored in the second step (S317, S318), and determining whether the synchronization sensitivity is within the stored upper and lower limits ( S319), and if the synchronization sensitivity is within a predetermined value, storing the memory (S320); checking whether the channel is the last channel, ending the search if it is the last channel, and executing the automatic channel search operation by increasing the channel number if it is not the last channel. Return to step (S321, S322) is made.

The operation of the present invention as described above is as follows.

First, when performing automatic channel search and memory operation using the RF / tuner / IF unit 10, the best synchronization point must be found. Therefore, when the user selects the automatic channel search mode for the first time, the microprocessor 70 displays the OSD. It sends out a message to input the channel number currently being broadcast through the screen and receives the key input to find the point where the synchronization sensitivity of the corresponding channel is optimal.

In this case, after setting up how much screen the user will remember, execute auto search to save the channel if the consumer does not have the desired sync sensitivity, so that the customer can solve the trouble of finding and clearing the memorized channel one by one. do.

That is, when the automatic channel search mode is set (Y branch of S311), the microprocessor 70 requests the input of the channel number currently being broadcast (S312), and checks whether the synchronization sensitivity is the optimal point when the channel number is input (S313). AFT of the channel is executed.

At this time, if the optimum point is found (Y branch of S313), the synchronous sensitivity level that is the optimum point and a message for changing the synchronous sensitivity are output on the OSD screen (S314), and at the same time, the stop key for changing the synchronous sensitivity is input. Or waits for key input while checking whether a specified time elapses (S315).

In the standby state, if the synchronous sensitivity is changed within the designated time, the upper and lower limits of the changed synchronous sensitivity level are stored (S316). On the contrary, if the synchronous sensitivity is not changed within the designated time or the synchronous sensitivity change stop key is immediately input, the microprocessor The upper limit and the lower limit of the synchronization sensitivity level already stored by 70 remain intact.

Next, the microprocessor 70 executes automatic channel search from the low channel based on the sync sensitivity level stored in the above step (S317, S318) so that the sync sensitivity of the current channel is within a prescribed value (upper and lower limit values already stored). (S319).

As a result of the determination, if the synchronization sensitivity is outside the prescribed value (N branch of S319), the channel is not memorized. If the synchronization sensitivity is within the specified value (Y branch of S319), the channel is stored in the memory unit 50 (S320). )

If it is the last channel (Y branch of S321), the search is terminated, and if it is not the last channel (N branch of S321), the channel number is increased (S322) to execute the automatic channel search operation. By returning, a channel search operation up to the last channel is performed.

According to the present invention as described above, when the automatic channel search mode is set, the user can arbitrarily set the upper and lower limits of the synchronization sensitivity used in the channel search on the OSD screen by using the AFT value of the channel currently being broadcast. If the sensitivity is changed within the specified time, the upper and lower limits of the changed sensitivity are memorized and the automatic channel search mode is executed. Thus, the user can arbitrarily set the channel search and memory operation for the weak signal channel. There is an advantage that can be prevented from being memory.

Claims (1)

A first step of waiting for a key input while executing an AFT of a channel currently being broadcast and outputting a message for changing a synchronization sensitivity level that is an optimal point and its synchronization sensitivity when the automatic channel search mode is set; A second step of storing an upper limit value and a lower limit value of the changed synchronization sensitivity level when the synchronization sensitivity is changed within the time designated in the first step; The automatic channel search of the VSI system comprising the third step of repeatedly executing the automatic channel search based on the synchronization sensitivity level memorized in the second step so as to memory only a channel whose synchronization sensitivity is within a prescribed value until the last channel. Channel memory method based on reception sensitivity.