KR19980068597A - Broadcast type automatic identification device - Google Patents

Abstract

The present invention relates to a broadcast type automatic identification device which reduces the time for searching and setting a broadcast channel by accurately identifying and storing the broadcast method, and eliminates the inconvenience of selecting and selecting a channel set after the search setting. A tuner 4 for tuning and outputting a desired broadcast signal among the received broadcast signals, a video signal demodulator 5 for demodulating and outputting a video signal from the tuned output signal, and an audio frequency modulated carrier in the demodulated video signal. A voice carrier detection unit 50 for detecting a signal, a color signal phase comparison unit 7 for detecting and comparing a phase of a color signal in the demodulated video signal, a synchronization signal detection unit 8 for detecting a synchronization signal in the demodulated nutrition signal, and data The memory 20 stores the control unit and the tuning unit 4, and identifies a broadcasting method based on the voice carrier detection and the phase comparison. A microcomputer 30 stored in the memory 20, and a SECAM-L / L 'controller 60 for inverting a demodulation output signal of the video signal demodulator 5 under the control of the microcomputer 30; It can be configured to speed up the automatic channel setting, prevent the broadcasting channel from being redundantly stored, to facilitate the selection of the broadcasting channel by the viewer, and to eliminate the phenomenon that the effective channel due to unnecessary channel information storage is not stored. Even when the broadcasting method is SECAM-L broadcasting method, it is a very useful invention that can be viewed on a normal screen.

Description

Broadcast type automatic identification device

The present invention relates to a broadcasting method automatic identification device, and more particularly, to accurately identify and store a broadcasting method in an area in which a plurality of broadcasting methods exist, thereby reducing the time for searching and setting the broadcast channel and The present invention relates to a broadcast type automatic identification device that eliminates the inconvenience of self-selection.

In the conventional broadcast type automatic identification device, as shown in FIG. 5, an output signal of the tuning unit 4 and the tuning unit 4 for tuning and outputting a desired broadcasting signal among the broadcasting signals received from the antenna 1. A video signal demodulator (5) for demodulating and outputting a video signal, a color signal phase comparator (7) for detecting a phase of a color signal in a video signal received from the video signal demodulator (5), and the video signal demodulator ( 5) controls the synchronization signal detection unit 8 for detecting the presence or absence of a synchronization signal in the video signal received from 5), the memory 2 for storing data, and the tuning unit 4, according to the synchronization signal detection and the color signal phase. It was comprised including the microcomputer 3 which sets a channel.

FIG. 4 is a diagram for storing each broadcasting channel to be tuned in a specific region, a broadcasting method of the channel, and a corresponding frequency. Referring to FIG. Explain.

First, when the viewer selects the channel automatic setting mode, the microcomputer 3 reads the frequency for each broadcasting method stored in the memory 2 as shown in FIG. 4 and uses PAL (Phase alternating by line system: Germany). This is a type of color television system developed) and automatic tuning is started for the corresponding frequencies of PAL broadcasting system and SECAM D / K broadcasting system, and SECAM-L broadcasting system respectively. First, the microcomputer 3 inputs the frequency 48.25MHz corresponding to the 02 channel of the PAL broadcasting system to the tuning unit 4, and the tuning unit 4 tunes the broadcasting signal corresponding to the frequency 48.25MHz to perform the tuning. The video signal is output to the demodulation section 5. The video signal demodulator 5 demodulates the video signal from the output signal of the tuner 4 and transmits the video signal to the color signal phase comparator 7 and the synchronization signal detector 8. The sync signal detector 8 detects the presence or absence of a sync signal in the output video signal of the video signal demodulator 5 and transmits it to the microcomputer 3. When the synchronization signal is detected, the microcomputer 3 stores the PAL broadcast method in the memory 2 on the 02 channel, and the frequency (55.25 MHz) corresponding to the next broadcast channel (03 channel) of the PAL broadcast method is as described above. Repeat the same operation. If the synchronization signal is not detected in the video signal of the corresponding frequency, the microcomputer 3 determines that the broadcast channel and the frequency are invalid and does not store the broadcast channel and the frequency in the memory 2.

When such a process is performed for channel 21 (471.25 MHz), since the frequency bands are the same, the microcomputer 3 receives the broadcast method detection result by the color signal phase comparator 7 even if a synchronization signal is detected. When the color signal phase comparison unit 7 distinguishes between the SECAM broadcasting system and the non-SECAM broadcasting system based on the color signal phase in the video signal, the memory system 2 identifies the broadcasting system based on the divided input data. After this process is performed for the PAL broadcasting method, the same process is performed for the SECAM-L broadcasting method, and the broadcast signal existing in all channels and the broadcasting method are automatically identified and stored. When the channel is selected, the microcomputer 3 controls the signal processing of the video signal demodulator 5 according to the broadcasting method read from the memory 2. .

Fig. 5 is a table of the results stored in the memory 2 by automatically setting channels according to the above procedure.

However, when the channel is automatically set by the conventional broadcasting type automatic identification device operating as described above, as shown in Fig. 7, the SECAM D / K broadcasting type of 495.25MHz is PAL broadcasting type searching and SECAM-L broadcasting searching. By SECAM (Sequentiel couleur a memoire) is a type of color TV system developed by France, which is stored twice (sequences 13 and 14) (even when the 495.25 MHz band is SECAM-L) In addition, even when the actual broadcasting method is SECAM-L broadcasting method, it is recognized as SECAM broadcasting method and when demodulated by SECCAM D / K broadcasting method (modulation / demodulation method such as PAL broadcasting method), There was a problem that the broadcast can not be viewed normally because the screen is output upside down.

In addition, when there are many redundantly stored channels as shown in FIG. 7, the unnecessary channels may be deleted or the channel up / down keys may be used several times to watch a desired channel. There was a troublesome problem.

Accordingly, the present invention has been made to solve the above problems, and provides an automatic broadcast method automatic identification device for accurately identifying and storing only a valid broadcast method without overlapping tuning processes.

1 is a block diagram showing a preferred embodiment of a broadcast type automatic identification device according to the present invention,

2 is a flowchart in which the identification apparatus of FIG. 1 performs a channel automatic setting mode;

3 is a diagram showing, for example, the result of automatic channel setting by the broadcast type automatic identification device according to the present invention.

4 is a diagram illustrating, for example, a process of identifying a broadcasting method by the identification device of FIG.

5 is a block diagram showing a conventional broadcast type automatic identification device,

6 is a diagram of a broadcasting scheme and a corresponding frequency of a broadcasting channel of a specific region, for example.

FIG. 7 is a diagram showing, for example, the results of automatic channel setting by the conventional broadcasting type automatic identification device.

Explanation of symbols on the main parts of the drawings

1 antenna 2,20 memory

3,30: Micom 4: Synchro

5 video signal demodulator 7 color signal phase comparator

8 sync signal detector 50 voice carrier detection unit

60: SECAM-L / L 'control unit

In accordance with another aspect of the present invention, there is provided a broadcasting system automatic identification apparatus, comprising: first discriminating means for classifying a broadcasting system according to whether a voice frequency modulation carrier of a received broadcasting signal is detected, and a phase of a color signal of the broadcasting signal. And a storage means for discriminating and storing the broadcasting method based on a combination of the broadcasting methods divided by the first separating means and the second separating means. The first dividing means distinguishes between SECAM-L broadcasting and other broadcasting methods, and the second dividing means distinguishes between SECAM-L broadcasting and other broadcasting methods.

According to another aspect of the present invention, when the viewer selects the channel automatic setting mode, the first discriminating means detects a voice frequency modulated carrier in the received broadcast signal, and according to the detection result. A SECAM-L broadcast method and another broadcast method are distinguished, and data corresponding to the result of the classification is transmitted to the storage means. At the same time, the second classification means also compares the phase of the color signal in the received broadcast signal to classify it into SECAM broadcasting method and other broadcasting methods, and transmits the data corresponding to the classification result to the storage means. The storage means combines the data transmitted from the first and second classification means, respectively, and the broadcasting method is SECAM-L broadcasting method, SECAM broadcasting method other than SECAM-L broadcasting method, and other broadcasting methods, respectively. The stored identification value is used for later broadcast viewing.

Hereinafter, the configuration and operation of the broadcast type automatic identification device according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a block diagram showing a preferred embodiment of the broadcast type automatic identification device according to the present invention. The tuning section 4 for tuning and outputting a desired broadcast signal among the broadcast signals received from the antenna 1 is described above. A video signal demodulation section 5 for demodulating and outputting a video signal from the signal output from the demodulation section 4, an audio carrier detection section 50 for detecting an audio frequency modulated carrier in the demodulated video signal, and a video signal demodulation section within the demodulated video signal. Control the color signal phase comparison unit 7 for detecting and comparing the phase of the color signal, the synchronization signal detection unit 8 for detecting the synchronization signal in the demodulated video signal, the memory 20 for storing data, and the tuning unit 4 And a demodulation of the video signal demodulator 5 under the control of the microcomputer 30 and the microcomputer 30 that identify a broadcasting scheme based on the voice carrier detection and the phase comparison and store the same in the memory 20. Exodus And a SECAM-L / L 'controller 60 for inverting the output signal.

FIG. 3 is a diagram showing, for example, a result of channel setting automatically by the broadcasting method automatic identification apparatus according to the present invention for a broadcasting method and a corresponding frequency to be tuned in a specific band as shown in FIG. 6, and FIG. Table of data combinations for example.

FIG. 2 is a flowchart illustrating a process of performing a channel automatic setting mode by the apparatus for automatically identifying a broadcast method according to the present invention. Hereinafter, the operation of the embodiment of FIG. 1 will be described in detail with reference to the flowchart of FIG. 2.

In the broadcast method automatic identification device according to the present invention, since the broadcast method and the corresponding frequency for the broadcast channel as shown in FIG. 6 are stored in the memory 20, when the viewer selects the channel automatic setting mode (S2), the micom ( 30) reads the broadcasting method and the corresponding frequency for each broadcasting channel stored in the memory 20, and automatically tunes to the corresponding frequencies of the PAL broadcasting method, the SECAM D / K broadcasting method, and the SECAM-L broadcasting method, respectively. To start. First, the microcomputer 30 compares broadcast frequencies assigned to channel 02 (S3) and determines whether the frequencies are the same (S11). If the frequency is not the same as the determination result of the microcomputer 30, the tuning unit 4 is tuned to the first frequency of 48.25MHz (S21). The tuner 4 tunes a broadcast signal corresponding to a frequency 48.25MHz broadcast wave band from the broadcast signal received from the antenna 1 and outputs the broadcast signal to the video signal demodulator 5. When the video signal demodulator 5 demodulates and outputs a video signal from the output signal of the tuner 4, the sync signal detector 8 detects a sync signal within the demodulated video signal (S22), When the synchronization signal is detected, the following broadcast method identification process is performed. The voice carrier detection unit 50 detects a voice frequency modulated carrier in the demodulated video signal, and when a carrier is detected, a value of 'H' (logic 1). If not detected, a value of 'L' (logical 0) is output to the microcomputer 30 (S23). Since the SECAM-L broadcast method uses AM modulation, a frequency modulated carrier is not detected, and thus a value of 'L' is output. The color signal phase comparison unit 7 also compares the value corresponding to the phase of the color signal of the demodulated video signal with a predetermined reference value, and divides the SECAM broadcasting method into 'H' and the PAL broadcasting method into logical values of 'L'. (S24) It outputs to the said microcomputer 30. As shown in FIG. 4, the microcomputer 30 which receives the above-mentioned division values is PAL broadcasting method when the combination value is (H, L), and SECAM D / K broadcasting method when (H, H) is received. , (L, H) is identified by the SECAM-L broadcast scheme (S25), and stores the code value, frequency and channel number corresponding to the identified broadcast scheme in the memory 20 (S26). In the next frequency band (55.75MHz), the tuning process of the next channel 03 is performed without performing the tuning process. If the synchronization signal is not detected in the synchronization signal detecting step S22, the next frequency band ( 55.75MHz) is also selected and tuned (S28, S21, ....) to proceed with the broadcast method identification process. If the frequency bands present in the corresponding channel are the same (S11), the microcomputer 30 performs the broadcasting method identification process only for the same one frequency band (S12, S31, S32, ...) It will proceed with frequency. After the above process is performed for the frequencies corresponding to all broadcast channels, the channel automatic setting mode is finished (S52).

If the synchronization signal is not detected in the video signal of the corresponding frequency (S22, S31), the microcomputer 30 determines that the broadcast channel and frequency are invalid and does not store the broadcast channel and frequency in the memory 20. .

When the automatic channel setting is completed in the above manner, the channel information as shown in FIG. 3 is stored in the memory 20. The channel information created in FIG. 3 is not duplicated and recorded at all, and shows that the SECAM-L broadcasting method is correctly identified and recorded.

When the viewer selects the desired broadcasting channel after the operation is completed by the channel automatic setting mode, the microcomputer 30 reads the broadcasting channel information (broadcasting method and corresponding frequency) stored in the memory 20 and corresponds to the corresponding broadcasting channel. The frequency is tuned to allow viewers to watch. At this time, if the tuned broadcast method is a PAL broadcast method or SECAM D / K broadcast method, normal screen viewing is possible, but in the case of SECAM-L broadcast system, normal screen viewing is impossible, so that the microcomputer 30 selects the SECAM- The control signal for inverting and outputting the video signal is transmitted to the video signal demodulator 5 through the L / L 'controller 60. Accordingly, the video signal demodulator 5 inverts the video signal and outputs the video signal, thereby enabling the viewer to normally view the screen.

The automatic broadcast method identification apparatus according to the present invention made as described above, by identifying and storing the broadcast method by tuning only once for the same frequency of the broadcast channel, speeds up the automatic channel setting, and prevents unnecessary storage of redundant broadcast channels. . Therefore, it is easy for the viewer to select a broadcasting channel, and it is possible to exclude the phenomenon that a valid channel cannot be stored due to unnecessary channel information storage, and can be viewed as a normal screen even when the broadcast method to be watched is a SECAM-L broadcast method. It is a very useful invention.

Claims (2)

First dividing means for dividing the broadcasting scheme according to the presence or absence of a voice frequency modulated carrier of the received broadcasting signal; Second dividing means for dividing the broadcasting system according to the phase of the color signal of the broadcasting signal; And a storage means for discriminating and storing the broadcasting method based on a combination of the broadcasting methods divided by the first and second dividing means. The method of claim 1, The first dividing means distinguishes the SECAM-L broadcasting method from other broadcasting methods, And said second dividing means is classified into SECAM broadcasting method and other broadcasting method.