KR200256713Y1 - Apparatus for storing brocasting channel in receiver - Google Patents

Abstract

The present invention relates to a device for receiving a television broadcast signal, the image processing unit in the device of the present invention is driven in the PAL or SECOM mode to PAL or SECOM processing the signal received in the tuning unit to provide to the display means, the synchronization detection unit And detecting and providing a synchronization signal from the received signal, and providing a method information of the received signal with a PAL and SECOM discrimination unit, the AFT voltage detector provides the AFT voltage of the received signal to the tuning unit, and the microcomputer From among the channels that are controlled to receive the highest channel signal sequentially from the lowest receivable channel, and the synchronization signal is provided from the synchronization detector, and the AFT voltage corresponding to the broadcast signal is provided from the AFT voltage detector, According to the discrimination, only the channels where the broadcast signal corresponding to the driving mode of the image processor is selected Select and save by broadcasting method.

As such, the present invention has an effect that PAL and SECOM broadcast channels can be accurately distinguished and stored for each PAL and SECOM broadcast in a receiving device capable of processing PAL and SECOM broadcast signals.

Description

A broadcast channel storage device of a broadcast signal receiving device {APPARATUS FOR STORING BROCASTING CHANNEL IN RECEIVER}

The present invention relates to a receiver for receiving PAL and SECOM broadcast signals, and more particularly, to a broadcast channel storage device for a broadcast signal receiving apparatus for accurately selecting only PAL and SECOM television broadcast channels and storing channel information. will be.

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 by 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.

On the other hand, when the above-described methods are applied to the PAL or SECOM scheme, the PAL and SECOM have similar bandwidths, and the following problems occur.

In the case of searching and storing a broadcasting channel using a PAL receiving device, SECOM broadcasting may be searched for in a channel other than the PAL broadcasting channel. In this case, a SECOM broadcasting channel may be mistaken and stored as a PAL broadcasting channel. do. In addition, when a broadcast channel is searched and stored using a SECOM receiving device, a PAL broadcast may be searched for in a channel other than the SECOM broadcast channel. In this case, a channel received with a PAL broadcast may be mistaken for a SECOM broadcast channel. Will be saved.

The broadcast signal of the PAL method must be processed in the PAL method so that the broadcast signal can be decoded and reproduced. Therefore, as described above, since the SECOM broadcast channel set as the broadcast channel in the PAL receiver cannot be decoded by the receiver, the SECOM broadcast channel is no different from the no signal channel in the PAL receiver.

Similarly, since the PAL broadcast channel set as the broadcast channel in the SECOM receiver cannot be decoded by the receiver, the PAL broadcast channel is no different from the no signal channel in the SECOM receiver.

On the other hand, some television broadcasting receivers are configured to process both the PAL method and the SECOM method. Even in this case, broadcast channels need to be stored separately for PAL and SECOM. That is, if the receiving device operates in the PAL mode and the broadcast channel stored in the memory is the SECOM broadcast channel, the receiving device does not process the SECOM broadcast channel in the SECOM method, and thus the receiving device cannot display the broadcast signal correctly. However, even when only the PAL broadcast channel is selected and stored as described above, the SECOM broadcast channel may be misidentified as a PAL broadcast channel, and the PAL broadcast channel is mistaken as a SECOM broadcast channel even when only the SECOM broadcast channel is stored. There is a problem that it can be stored.

The present invention is to solve such a problem, and an object of the present invention is to provide a broadcast channel storage device of a broadcast signal receiving apparatus capable of clearly distinguishing and storing PAL and SECOM broadcast channels.

In order to achieve the above object, the present invention provides a receiver for selecting and storing only a broadcast channel in a television broadcast band, comprising: a tuning unit for receiving a broadcast signal; It is driven in PAL or SECOM mode and PAL or SECOM processes the signal received by the tuning unit and provided to the display means. The synchronization detector detects and provides a synchronization signal from the received signal. An image processor configured to provide method information of a signal and include an AFT voltage detector to provide an AFT voltage of a received signal; The tuner controls the tuner to sequentially receive a signal of the highest channel from the lowest receivable channel, and provides a sync signal from the sync detector, wherein an AFT voltage corresponding to a broadcast signal is provided from the AFT voltage detector. According to the determination of the PAL and SECOM discrimination unit, a microcomputer for selecting only channels for which a broadcast signal corresponding to a mode in which the image processor is being driven is detected and storing for each broadcasting scheme.

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 illustrating a driving state of a broadcast channel storage device of a broadcast signal receiving device 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

32: PAL, SECOM discrimination unit

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

Fig. 1 shows a schematic block diagram of a television broadcast receiving apparatus according to the present invention.

As shown, the tuning unit 1 is configured in the receiving device 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 the 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 image processing section 3, a PAL and SECOM determining section 32 is further configured, and the PAL and SECOM determining section 32 determines whether the video signal is a PAL or SECOM signal and provides it to the microcomputer 2. Such a configuration of the PAL and SECOM discrimination unit 32 is disclosed in V-Cal's ARM / Secham system discrimination circuit (application number 87-18515) filed in 1987, and thus, detailed description thereof will be omitted.

The microcomputer 2 drives the image processor 3 in a PAL or SECOM method according to a user's control, and controls the driving of the apparatus according to the present invention as described below.

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 increasing 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 a signal of the 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 S11.

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 broadcast signal is the PAL method according to the PAL of the image processor 3 and the signals from the SECOM determining unit 32. As a result of the determination in step S8, if the broadcast signal is the PAL method, the microcomputer 2 proceeds to step S9 to determine whether the current operation mode of the image processor 3 is the PAL mode. That is, it is determined whether the user operates the reception device of the present invention in the PAL mode. As a result of the determination in step S9, if the image processing unit 3 is operating in the PAL mode, the user stores only the PAL broadcast channel in the memory. The microcomputer 2 is currently receiving the current of the tuning unit 1 currently being received. The PAL broadcast channel is stored in the internal memory of the microcomputer 2 (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 (S11). If it is not the channel CHn, the flow advances to step S12 to increase the reception channel of the tuning unit 1 by 1, and then returns to step S3.

On the other hand, if the broadcast signal is not the PAL method according to the signal from the PAL and SECOM determination unit 32 of the image processing unit 3 as a result of the determination in step S8, it will be a SECOM broadcast signal. Therefore, the microcomputer 2 proceeds to step S13 to determine whether the current operation mode of the image processor 3 is the SECOM mode. That is, it is determined whether the user operates the reception device of the present invention in the SECOM mode. As a result of the determination in step S13, if the image processing unit 3 is operating in the SECOM mode, the user stores only the SECOM broadcasting channel in the memory, and the microcomputer 2 is currently receiving the tuner 1 currently being received. The channel is stored in the internal memory of the microcomputer 2 as a SECOM broadcast channel (S14).

As such, the present invention has an effect that PAL and SECOM broadcast channels can be accurately distinguished and stored for each PAL and SECOM broadcast in a receiving device capable of processing PAL and SECOM broadcast signals.

Claims (1)

A receiving device that selects and stores only a broadcast channel in a television broadcast band. A tuning unit for receiving a broadcast signal; It operates in PAL or SECOM mode and processes the signal received by the tuning unit in the PAL or SECOM method and provides it to the display means, and includes a synchronization detector to detect and provide a synchronization signal from the received signal, and includes a PAL and SECOM determination unit. An image processor for providing type information of the received signal; An AFT voltage detector for providing an AFT voltage of the signal received by the tuning unit; The tuner controls the tuner to sequentially receive a signal of the highest channel from the lowest receivable channel, and provides a sync signal from the sync detector, wherein an AFT voltage corresponding to a broadcast signal is provided from the AFT voltage detector. And a microcomputer that selects and stores only channels for which a broadcast signal corresponding to a mode in which the image processing unit is driven is stored according to a broadcasting method according to the PAL and SECOM discrimination unit.