KR20030018660A - Method for storing brocasting channel in receiver - Google Patents

Abstract

PURPOSE: A method for storing a broadcasting channel of a broadcasting signal receiver is provided to accurately detect only a broadcasting channel using an audio signal included in a television broadcasting signal to store the detected broadcasting channel. CONSTITUTION: It is judged whether or not a received channel includes a synchronous signal(S4). When the received channel includes the synchronous signal, it is judged whether or not upper and lower AFT voltages are detected(S5,S6). When the upper and lower AFT voltages are detected, it is judged if an audio carrier frequency corresponding to the broadcasting mode in which a television broadcasting receiver operates is detected. When the audio carrier frequency is detected, the received channel is stored as a broadcasting channel.

Description

Broadcast channel storage method of broadcast signal receiving device {METHOD FOR STORING BROCASTING CHANNEL IN RECEIVER}

The present invention relates to an apparatus for receiving a television broadcast signal, and more particularly, to a broadcast channel storage method of a broadcast signal receiving apparatus for accurately selecting only a television broadcast channel and storing channel information.

Televisions, video cassette recorders, and the like that receive television broadcasts employ a method of automatically searching for and storing in a memory only a broadcast channel through which a broadcast signal is made within a radio band for television broadcast. The user may sequentially select a broadcast channel in the memory by using a channel up / down key of the receiving device. As the broadcast channel of the memory is a channel that is actually broadcasted as described above, the user may easily select only a broadcast channel. Can be.

In order to search only the channel on which the broadcasting is performed in the television broadcasting band, it is necessary to determine whether the broadcasting signal exists in the receiving channel while sequentially changing the receiving channel of the television. In order to determine the presence or absence of a broadcast signal, two methods have been conventionally used.

The first is to determine the presence or absence of a synchronization signal. That is, the broadcast signal is composed of an audio signal and a video signal, and the horizontal signal and the vertical sync signal are included in the video signal, and the channel for detecting the sync signal determines that the broadcast signal exists.

The second is to determine the presence of a broadcast signal using the AFT (Auto Fine Tunning) voltage. The AFT voltage is used as a means for accurately detecting the reception frequency of the receiving device at the center frequency of the broadcast channel. That is, the AFT voltage generator of the receiver outputs a preset AFT voltage when the center frequency of the broadcast channel and the reception frequency of the receiver match. Therefore, only a reception channel for which a preset AFT voltage is detected may be determined as a broadcast channel.

However, the above-described methods have the following problems.

First, the synchronization signal may be included in a ghost image signal, and there is a problem that a synchronization signal of another television broadcasting system using the same broadcast band may be temporarily detected. That is, even when the television receiving device is a PAL method, a SECOM broadcast signal may be received. In this case, a channel on which the SECOM broadcast signal is received is stored as a broadcast channel in a memory. However, since the PAL television cannot reproduce the SECOM broadcasting signal, it must be treated in the same way as the channel where broadcasting is not performed.

This problem occurs equally when using an AFT voltage. That is, even when the AFT voltage is used, there is a problem that a channel not broadcasted by a ghost or other broadcast signal can be mistaken as a broadcast channel.

The present invention has been made to solve this problem, and an object of the present invention is to provide a method capable of accurately detecting and storing only a broadcast channel using an audio signal included in a television broadcast.

In order to achieve the above object, the present invention provides a method of driving a reception apparatus for selecting and storing only a broadcast channel in a television broadcast band, the method comprising: determining whether a synchronization signal is included in a reception channel; Determining whether upper and lower AFT voltages are detected if a synchronization signal is included in the receiving channel; Determining whether an audio carrier frequency corresponding to a broadcast method in which the receiving device operates is detected when the upper and lower AFT voltages are detected; And if the audio carrier frequency corresponding to the broadcast method in which the receiver is operating is stored, storing the received channel as a broadcast channel.

1 is a schematic block diagram of a broadcast signal receiving apparatus according to the present invention;

2 is a diagram illustrating an AFT voltage when a broadcast signal is received;

3 is a flowchart of a broadcast channel storing method of a broadcast signal receiving apparatus according to the present invention;

<Description of the code | symbol about the principal part of drawing>

1: synchronization unit 2: micom

3: image processor 4: audio processor

5: AFT voltage detector 31: Sync detector

41-43: Audio Carrier Detection Unit

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram of a television broadcast receiving apparatus according to the present invention. The television broadcast receiving apparatus used in the present embodiment employs the PAL method, but it will be readily understood by those skilled in the art that the present invention may be adopted in the NTSC or SECOM method in addition to the PAL.

As shown, the tuning unit 1 is configured in the receiving apparatus of the present invention, and the tuning unit 1 is configured to receive a television broadcast signal by changing the receiving channel under the control of the microcomputer 2.

The signal received by the tuning unit 1 is provided to the image processing unit 3 and the audio processing unit 4. The image processing unit 3 demodulates the image signal of the tuning unit 1 and provides it to a display device such as a water pipe. The audio processing unit 4 demodulates the audio signal of the tuning unit 1 and provides it to a speaker. .

In the image processor 3, a sync detector 31 is configured as shown, and the sync detector 31 detects a sync signal from the signal of the tuner 1 and provides it to the microcomputer 2. In the audio processor 4, audio carrier detectors 41, 42, and 43 are configured, and the audio carrier detectors 41-43 determine whether an audio carrier frequency of a predetermined band is detected and the microcomputer 2 ) Gives the result. Here, the detection frequency of the audio carrier detection unit 41 is set to a 5.5 MHz high band with respect to the video signal band provided from the tuning unit 1 (PAL-BG method), and the detection frequency of the audio carrier detection unit 42 is tuning. It is set to a 6.0 MHz high band with respect to the video signal band provided from the section 1 (PAL-I method), and the detection frequency of the audio carrier detection section 43 is 6.5 with respect to the video signal band provided from the tuning section 1. It is set to MHz high band (PAL-DK method).

The microcomputer 2 drives the image processor 3 in a PAL-BG method, a PAL-I method, or a PAL-DK method according to a user's control.

An AFT voltage detector 5 is also connected to the tuner 1, and the AFT voltage detector 5 detects and provides the AFT voltage of the reception channel detected by the tuner 1 to the microcomputer 2. An example of an AFT voltage for a receive channel is shown in FIG. If 3.2V (higher AFT voltage) is detected from the illustrated AFT voltage, the reception channel may be determined to be a broadcast channel. Therefore, the microcomputer 2 may fine tune the reception channel of the tuning unit 1 as described below. The AFT voltage of 1.8 V is detected by adjusting (by finely adjusting the reception frequency of the tuning section 1). If the AFT voltage of 1.8V (lower AFT voltage) is not detected in the above-described process, it is determined that it is not a broadcast channel. However, if a lower AFT voltage (1.8V) is detected, the receiving channel is recognized as a broadcast channel and the tuner 1 The reception frequency of the tuner 1 is set as low as a predetermined value so that the reception frequency of the tuning unit 1 matches the frequency of the broadcasting channel. At this time, the detected AFT voltage is 2.5V.

3 is a flowchart illustrating an operation process of the microcomputer 2 described above.

The process shown in FIG. 2 is a process in which the microcomputer 2 controls the tuning unit 1 to receive and sequentially store only the broadcast channel while sequentially receiving from the lowest reception channel CH1 to the highest reception channel CHn within the broadcast band. to be.

First, when the channel automatic search and storage mode is set (S1), the microcomputer 2 sets the lowest channel CH1 (S2), and causes the tuning unit 1 to receive the signal of the set channel CH1 band. (S3). Then, the microcomputer 2 proceeds to step S4 to determine whether the synchronization signal has been detected by the synchronization detection unit 31, and if the synchronization signal is detected, proceeds to step S5. Proceed to S17.

In step S5, the microcomputer 2 determines whether an upper AFT voltage is detected. When the upper AFT voltage is detected, the microcomputer 2 proceeds to step S6. At this time, the microcomputer 2 finely increases the reception frequency of the tuning unit 1. The microcomputer 2 determines whether the lower AFT voltage is detected in step S6. When the AFT voltage is detected, the microcomputer 2 lowers the reception frequency of the tuning unit 1 by a predetermined value to match the reception frequency with the frequency of the broadcast channel (S7). The AFT voltage detected at this time is 2.5V as described above.

After performing step S7, the microcomputer 2 proceeds to step S8 to determine whether the current operation mode of the image processing unit 3 is the PAL-BG method, and proceeds to step S9 when the PAL-BG method is used. In step S9, the microcomputer 2 determines whether a signal indicating that an audio carrier signal has been detected from the audio carrier detection unit 41 is applied, that is, whether the audio carrier frequency is a PAL-BG scheme. As a result of the determination in step S9, if the audio carrier frequency corresponds to the PAL-BG system, the channel currently received by the tuning unit 1 is determined to be a broadcast channel by the PAL-BG system, and the current channel of the tuning unit 1 is determined. Is stored in the internal memory of the microcomputer 2 as a broadcast channel (S10).

After performing step S10, the microcomputer 2 determines whether the current receiving channel of the tuning unit 1 is the highest receiving channel (CHn) (S17). Proceeding to step S18, the receiving channel of the tuning unit 1 is increased by one, and then the flow returns to step S3 (S18).

On the other hand, if it is determined in step S8 that the current operation mode of the image processing unit 3 is not the PAL-BG method, the microcomputer 2 proceeds to step S11 and the current operation mode of the image processing unit 3 is PAL-. Determine whether it is in I mode. As a result of the determination in step S11, if the current operation mode of the image processing unit 3 is the PAL-I method, the microcomputer 2 proceeds to step S12 and a signal indicating that an audio carrier signal has been detected from the audio carrier detection unit 43 is detected. It is determined whether the audio carrier frequency is the PAL-I scheme (S12). As a result of the determination in step S12, if the audio carrier frequency corresponds to the PAL-I system, the channel currently received by the tuning unit 1 is determined to be a broadcast channel according to the PAL-I method, and the current channel of the tuning unit 1 is determined. Is stored in the internal memory of the microcomputer 2 as a broadcast channel (S13), and the flow proceeds to step S17.

On the other hand, if it is determined in step S11 that the current operation mode of the image processing unit 3 is not the PAL-I method, the microcomputer 2 proceeds to step S14 and the current operation mode of the image processing unit 3 is PAL-. Determine if it is in DK mode. As a result of the determination in step S14, if the current operation mode of the image processing unit 3 is the PAL-DK method, the microcomputer 2 proceeds to step S15 and a signal indicating that the audio carrier signal has been detected from the audio carrier detection unit 43 is detected. It is determined whether or not the audio carrier frequency is applied to the PAL-DK scheme. As a result of the determination in step S15, if the audio carrier frequency corresponds to the PAL-DK scheme, the channel currently received by the tuner 1 is determined to be a broadcast channel according to the PAL-DK scheme, and the current channel of the tuner 1 is determined. Is stored in the internal memory of the microcomputer 2 as a broadcast channel (S16), and the flow proceeds to step S17.

As described above, the present invention selects and stores only the channel in which the synchronization signal and the upper and lower AFT voltages are detected among the signals in the television broadcasting band, and the audio carrier signal of the band corresponding to the television broadcasting method is selected and stored as the broadcasting channel. The effect is that you can choose exactly.

Claims (4)

A driving method of a receiver for selecting and storing only a broadcast channel in a television broadcast band, Determining whether a synchronization signal is included in the reception channel; Determining whether upper and lower AFT voltages are detected if a synchronization signal is included in the receiving channel; Determining whether an audio carrier frequency corresponding to a broadcasting scheme in which the receiving apparatus is operating is detected when the upper and lower AFT voltages are detected; And storing the reception channel as a broadcast channel when an audio carrier frequency corresponding to the broadcast method in which the reception device is operating is detected. The method of claim 1, And determining whether the audio carrier frequency is 5.5 MHz apart from the broadcast signal when the receiving device is operating in a PAL-BG broadcasting method. The method according to claim 1 or 2, And determining whether the audio carrier frequency is 6.0 MHz apart from the broadcast signal when the receiving device is operating in a PAL-I broadcasting scheme. The method of claim 3, wherein And determining whether the audio carrier frequency is 6.5 MHz apart from the broadcast signal when the receiving device is operating in a PAL-DK broadcasting method.