KR200256714Y1 - Apparatus for storing brocasting channel in receiver - Google Patents

Abstract

The present invention relates to a receiving apparatus for selecting and storing only a broadcast channel in a television broadcasting band. The apparatus of the present invention includes a tuning unit for receiving a broadcast signal, and a synchronization detector for detecting a synchronization signal from the signal received in the tuning unit. The microcomputer allows the tuner to receive the channel real frequency of the highest search channel from a preset lowest search channel and stores only the channel where the synchronization signal is detected from the sync detector as a broadcast channel, and the search channel and the search channel are preset. The frequency at which the synchronization signal is detected is set as the broadcast channel while varying the channel reception frequency of the tuning unit by frequency band.

That is, the present invention not only determines whether the broadcast channel is received by searching the channel real frequency of the search channel when searching for the broadcast channel, but also determines whether there is a broadcast channel between the search channel and the search channel. There is an effect.

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 device for receiving a broadcast signal in a frequency tuning method, and more particularly, to a device capable of detecting a broadcast signal present in a frequency other than a predetermined channel.

Televisions, video cassette recorders, and the like, which 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, a conventional synchronization signal is used. 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 it is determined that the broadcast signal exists for the channel where the sync signal is detected.

However, this conventional method has the following problems.

In general, a channel (search channel) for checking the presence or absence of a broadcast signal is set to a predetermined frequency. However, the broadcast channel may also exist between the discovery channel and the discovery channel. In this case, the broadcast channel is skipped, and thus there is a problem that the presence or absence of a synchronous signal is not searched and stored in the reception channel as the broadcast channel.

The present invention solves this problem, and an object of the present invention is to provide an apparatus for checking whether a broadcast channel exists between a discovery channel and a discovery channel during discovery of a broadcast channel.

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 configured to receive a broadcast signal; A synchronization detector for detecting a synchronization signal from the signal received by the tuning unit; The tuning unit receives a channel real frequency of the highest search channel from a preset lowest search channel and stores only a channel for which a synchronization signal is detected from the synchronization detector as a broadcast channel, and the tuning channel is searched by a predetermined frequency band between the search channel and the search channel. A microcomputer is provided for setting a frequency at which a sync signal is detected as a broadcast channel while varying a negative channel reception frequency.

1 is a block diagram schematically illustrating a broadcast channel storage device of a broadcast signal receiving device according to the present invention;

2 is a flowchart illustrating a driving state of a broadcast channel storage device of a broadcast signal receiving device according to the present invention;

3 is a view showing a relationship between a channel real frequency and a channel reception frequency for explaining the operation of the broadcast channel storage 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

31: synchronization detection 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 video signal of the tuning unit 1 and provides it to the receiving tube or the like, and 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. The microcomputer 2 knows whether the reception channel of the tuning unit 1 is a broadcasting channel through the synchronization signal from the synchronization detecting unit 31, and stores only the broadcasting channels in the internal memory.

FIG. 2 is a flowchart specifically showing an operation process of the microcomputer 2 described above.

The illustrated process is a process in which the microcomputer 2 controls the tuning unit 1 and sequentially selects and stores only a broadcast channel while sequentially receiving from the lowest reception channel to the highest reception channel in the broadcast band.

First, when the automatic channel search and storage mode is set (S1), the microcomputer 2 sets the lowest channel at a frequency that can be received (S11), and causes the tuning unit 1 to set the frequency of the set channel (hereinafter referred to as a real channel frequency). .) Is received (S3). That is, the reception frequency of the tuning section 1 is set to the real channel frequency. Then, the microcomputer 2 proceeds to step S4 to determine whether the synchronization signal has been detected by the synchronization detecting unit 31. When the synchronization signal is detected, the microcomputer 2 proceeds to step S5 to determine the current reception channel of the tuning unit 1. Store in internal memory as broadcast channel. Then, the microcomputer 2 determines whether the current setting channel is the highest channel (S6), and ends all processes if the highest channel is present. If not, the microcomputer 2 increments the setting channel by one (S7) and returns to step S3.

On the other hand, if the synchronization signal is not detected as a result of the determination of step S4, the microcomputer 2 proceeds to step S8 and the reception frequency of the tuning unit (this reception frequency is a frequency other than the channel real frequency as will be described later. Channel reception frequency) satisfies Equation 1 below.

Here, the channel highest frequency means the highest frequency in the channel band.

The reason for performing Equation 1 in step S8 is as follows.

Suppose that the band of the channel is configured as shown in Figure 3, where the frequencies of the channels CH1, CH2, that is, the channel real frequency is 4HHz, 12MHz, the channel real frequency of the channel CH3 is 21MHz.

Conventionally, only the channel real frequencies of the channels CH1, CH2, and CH3 are received to determine the presence or absence of a synchronization signal. In the present invention, for example, the channel reception frequency is changed by 1 MHz to determine the presence or absence of a synchronization signal. For example, if the synchronization signal is not received by receiving the channel real frequency (12 MHz), the presence or absence of the synchronization signal is determined by changing the channel reception frequency by 1 MHz. Here, the channel reception frequency may not increase / decrease infinitely. To this end, in the present invention, only up to the interval between channel real frequencies (8 MHz between channels CH1 and CH2 and 10 MHz between channels CH2 and CH3) is searched. 1 is for searching for the lowest frequency at which the reception frequency of the channel CH2 can be searched on the-side (to the channel CH1 side). In the above example, it can be seen that the lowest frequency capable of searching the channel CH1 side is 8 MHz.

That is, the microcomputer 2 determines the presence or absence of the synchronization signal by decreasing the channel reception frequency by 1 MHz so that the channel reception frequency is 8 MHz (until the channel reception frequency according to Equation 1) (S9) (S10, S11). ) A synchronization signal is detected and the channel reception frequency is stored as a broadcast channel.

As described above, Equation 1 is for searching for the lowest frequency at which the reception frequency of the channel CH2 can be searched on the-side (to the channel CH1 side), and the reception frequency of the channel CH2 is shifted to the + side (channel ( The highest channel reception frequency that can be searched for) can be detected by Equation 2.

It can be seen that the channel reception frequency of the highest frequency for the channel CH2 is 17 MHz. Therefore, the microcomputer 2 increases the channel reception frequency by 1 MHz so that the channel reception frequency becomes 17 MHz (until the channel reception frequency according to Equation 2) (S12, S13) and determines whether there is a synchronization signal (S14, S15). A sync signal is detected and the channel reception frequency is stored as a broadcast channel.

In the above embodiment, if a synchronization signal is detected between the discovery channel and the discovery channel, the process returns to step S5. However, if necessary, the search process between the discovery channel and the discovery channel may be continued even after the synchronization signal is detected. It will be readily appreciated by those skilled in the art.

As such, the present invention not only determines whether a broadcast channel is received by receiving the channel real frequency of the search channel when searching for a broadcast channel, but also determines whether a broadcast channel exists between the search channel and the search channel. There is an effect.

Claims (3)

A receiving device that selects and stores only a broadcast channel within a television broadcast band. A tuning unit for receiving a broadcast signal; A synchronization detector for detecting a synchronization signal from the signal received by the tuning unit; The tuner receives a channel real frequency of the highest search channel from a preset lowest search channel, and stores only a channel for which a synchronization signal is detected from the synchronization detector as a broadcast channel, and the search channel and the search channel are each set in the predetermined frequency band. A broadcast channel storage device of a broadcast signal receiving apparatus, comprising a microcomputer that sets a frequency at which a synchronization signal is detected while varying a channel reception frequency of the tuning unit. The method of claim 1, The lowest channel reception frequency of the synchronous synchronization unit that is variable between the search channel and the search channel is The broadcast channel storage device of a broadcast signal receiving apparatus, characterized in that detected by. The method according to claim 1 or 2, The maximum channel reception frequency of the synchronous synchronization unit that is variable between the search channel and the search channel is The broadcast channel storage device of a broadcast signal receiving apparatus, characterized in that detected by.