KR0129259B1 - Channel auto-memory method & circuit by broadcasting station name key - Google Patents

Abstract

The method for selecting desired channel easily includes steps: a) decoding data of name provided from slice circuit; b) reading present receiving AGC data and storing channel and AGC data into address region of memory if the read data is not stored; and c) storing greater channel and AGC data after comparing the stored AGC data and present tunning AGC data if the data is stored.

Description

Channel automatic method and circuit by station name key

1 is a block diagram of a general television receiver.

2 is a block diagram of a channel automatic memory circuit using a station name key of the present invention.

3 is a mapping of memory in FIG.

4 is a diagram illustrating a configuration of a signal sliced in a data slice unit.

5 is an exemplary configuration diagram of a KBPS packet data format in which a broadcasting station name is entered.

6 is an overall signal flow diagram of automatic channel tuning showing an application of the present invention.

7 is a detailed signal flow diagram for automatic channel tuning of the present invention.

* Explanation of symbols for main parts of the drawings

11: tuner 12: intermediate frequency processing unit

13 chroma unit 14 A / D converter

15: data slice section 16: remote control

17: infrared receiver 18: microcomputer

19: memory CPT1: Citi

The present invention relates to a technique for tuning a broadcast channel. In particular, when there are a plurality of channels of a corresponding broadcast station when a channel is to be stored for each broadcast station, a broadcast channel having the best signal state is selected based on the level of the automatic gain adjustment signal. The present invention relates to a channel automatic memory method and circuit using a broadcasting station name key, which is adapted.

FIG. 1 is a block diagram of a general television receiver. As shown therein, a tuner 1 for processing a high frequency signal received through an antenna ANT to extract audio and video intermediate frequencies, and an output from the tuner 1 An intermediate frequency processor 2 for restoring the original video signal Vi by processing the video intermediate frequency, and restoring the original audio signal AU by processing the audio intermediate frequency, a remote controller 3 and an infrared receiver ( 4) The tuner 1 is controlled according to a viewer's control command input through 4) so that the channel desired by the viewer is tuned, and the microcomputer 5 collectively controls the system, and is output from the intermediate frequency processor 2. It is composed of a chroma unit 6 for receiving a video signal to be processed to be suitable for display on the CPT, the operation of the television receiver configured as described will be described as follows.

When the channel is to be tuned, the viewer selects the channel using the numeric keys (0 to 9) or the channel up / down keys (△ / ▽) provided on the remote controller 3, and when the numeric keys are pressed, the microcomputer (5) recognizes the currently selected channel through the infrared receiver 4, and outputs the tuning data of the recognized channel to the tuner 1 to tune the corresponding channel.

Accordingly, the broadcast signal received through the antenna ANT is supplied to the tuner 1, and the audio and video intermediate frequencies of the tuned channel are extracted, and then supplied to the intermediate frequency processor 2, and the original video signal Vi and The audio signal VU is restored, and the restored video signal is supplied to the chroma unit 6, processed into a form suitable for display on the CPT, and displayed on the CPT. The program of the channel can be watched.

When the channel is pressed using the channel up / down keys (△ / ▽), the key is skipped to the next channel already stored in the current channel each time the key is pressed, for example, 2, 10, Channel 20 is already memorized, and channel 20 is tuned when channel up key △ is pressed while channel 10 is currently tuned, and channel 2 is tuned when down key ▽ is pressed.

However, due to regional characteristics, the same broadcast signal is frequently received through several channels. In the conventional automatic channel tuning system, the broadcast signal is unconditionally determined because the same broadcast signal is not provided. After memorizing all the channels that exist, it is memorizing the number of the better channel according to the viewer's judgment, it takes a lot of time to tune and it is difficult to select a good channel. When selecting a broadcast channel, there was a hassle to check the current channel and proceed in the desired direction.

Accordingly, an object of the present invention is to easily store the channel number of the desired broadcasting station by storing the number of the channel with the largest field strength when the same broadcast signal is received in the multiple channels during automatic channel tuning, and adding the key with the broadcasting station name. A channel automatic memory method and circuit using a station name key to be selected is provided.

The channel automatic memory method of the present invention for achieving the above object is a first step of checking whether a broadcast signal exists in the channel to be tuned at the time of channel setting, and if a broadcast signal is present in the tuning channel is output from the slice unit A second step of decoding the main station name data and recognizing the station name; and reading AGC data of the currently received broadcast signal, checking whether the current tuning channel is stored in the corresponding area of the memory, and not storing the corresponding station in the memory. A third step of storing channel data and AGC values of the currently tuned channel in the name address area; and if data of another channel is already stored in the channel area of the broadcasting station name, the AGC value and the currently tuned channel Comparing the AGC value, a fourth step of storing channel data and AGC value of a channel having a larger value is performed.

2 is a block diagram of a channel automatic memory circuit according to the present invention broadcasting station key. As shown therein, a tuner 11 for processing a high frequency signal received through an antenna ANT1 to extract an audio and video intermediate frequency. And an intermediate frequency processor 12 for processing the video intermediate frequency output from the tuner 11 to restore the original video signal Vi, and processing the audio intermediate frequency to restore the original audio signal AU. And a chroma unit 13 for receiving a video signal output from the intermediate frequency processor 12 and processing it for display on a CPT, and automatic gain control of analog output from the intermediate frequency processor 12. A / D converter 14 for converting the voltage AGC into a digital signal, and a data slice for detecting broadcast station name data inserted in the video signal Vi output from the intermediate frequency processor 12. (15), a numeric key, a volume control key, a channel increase / decrease key, a channel key marked with a broadcasting station name, and a remote controller 16 for outputting various key signals, and an infrared key signal output from the remote controller 17. When the channel automatic tuning key signal is input through the infrared receiver 17 and the infrared receiver 17, the tuner 11 changes the tuning data and outputs the output data of the data slice unit 15 at each channel tuning. On the basis of this, the station name of the currently tuned channel is recognized, and the auto gain control voltage of the channel currently input through the A / D converter 14 is compared with the auto gain control voltage previously stored in the memory 19. The microcomputer 18 stores a channel for detecting a gain control voltage, which is described in detail with reference to FIGS. 3 to 7 attached to the operation and effect of the present invention. The command is as follows.

As shown in FIG. 3, the memory 19 to which the present invention is applied has a format in which a channel data area and an AGC area are assigned to each address using the broadcast station name as an address.

In addition, as shown in FIG. 4, the configuration of the signal sliced by the data slice unit 15 is carried by the KBPS signal on the 16th line of the video signal field 1, and a 503KHZ sine wave for adjusting the data slice sampling period is provided. It consists of 7 and 16 bits of data.

In addition, as shown in FIG. 5, the structure of the KBPS packet data format into which the broadcasting station name is input is composed of nine words (8 bit 2 bytes). Here, first 2 bytes (7FF2 _HEX ) data indicating the start of a packet is input, and the remaining 4 words (8 bytes) are data indicating a main broadcasting station. The last 1 word is end data (7FFE _HEX ) indicating the end of the packet.

When the signal of the same broadcasting station is received from several channels in a geographic area, the automatic channel selection step selects a broadcasting station channel having the strongest signal, that is, the AGC level, and stores the channel number. FIG. 7 is a flowchart illustrating the overall signal flow of automatic channel setting by the automatic channel setting key. FIG. 7 shows that the channel name is decoded by tuning one channel at the time of automatic channel setting, and then the channel data is stored in the memory address of the corresponding station. Signal flow chart of the operation shown.

First, referring to FIG. 6, the overall operation of the automatic channel setting will be described. If the automatic channel key signal is inputted, it will be set to the automatic channel setting mode if it is input. Confirm or exit. (S1-S3)

However, if the check result indicates that the current automatic channel setting mode, the automatic channel setting program as shown in FIG. 7 is executed. Then, if all the channels are searched once, the automatic channel setting mode is canceled and terminated. (S4-S6)

That is, steps 4-6 are the steps of tuning the entire channel once to check for the presence of a signal, and when it is determined that the signal exists, determining whether to store the channel data with the signal according to the name of the broadcasting station.

The automatic channel setting method in the fourth step S4 recognizes a broadcasting station name of a tuned channel based on a program identification signal KBPS while sequentially tuning channels during automatic channel setting, and stores a memory area of the corresponding broadcasting station name. If a channel data is stored in a channel or a channel is already stored in the above area, a channel having a better electric field strength is stored among the stored field strength (AGC) and the currently received channel field strength (AGC). This process will be described in more detail with reference to FIG. 7 as follows.

First, the current tuning data is increased by 1 to tune to the next channel, and it is checked whether a broadcast signal exists in the newly tuned channel and terminates as it is. (S31-S33)

However, if a broadcast signal exists in the newly tuned channel, the main station name data output from the data slice unit 15 is decoded to recognize the station name, and the AGC data output from the A / D converter 14 is read. The channel 19 and AGC data of the recognized broadcasting station are read from the memory 19 to check whether the channel data is data stored one or more times after automatic channel setting. That is, the memory is initialized during automatic channel setting, so check if the data is initialized. (S34-S37)

If the channel data is the initialization data as a result of the above confirmation, the channel data and the AGC level data read above are stored in the area of the tuned station name address since it is the first station signal received after the automatic channel. (S39, S40)

However, if the data in the channel data area is not the initialization data, the AGC value read from the memory 19 is compared with the AGC value read from the A / D converter 14 because the station signal of the channel stored at least once after automatic channel setting. (S38) If the AGC value of the memory 19 is large, the signal of the channel stored in the memory 19 is judged to be a better signal than the signal currently tuned, and if the AGC data of the memory 19 is small, the channel currently being tuned. By judging that the signal is better than the already stored channel and storing the channel data and AGC data in the memory 19 again, the signal having the best state is selected when the signals of the same broadcasting station are inputted through different channels.

As a result, by initializing the memory 19 at the time of initial automatic channel setting and executing the automatic channel setting program as shown in FIG. 7, the optimal channel data for the broadcast station name at the time of channel setting is stored.

As described above, when the corresponding channel A / D data of the broadcasting station is stored in the memory 19, and the station name key such as KBS1 is input from the remote controller 16 during the actual tuning, the microcomputer 18 broadcasts the broadcasting station of the remote controller 16. Memory Key Recognition (19)

The channel data is read from the broadcasting channel data area of the broadcasting station in the region of the broadcasting station, and the tuning data of the corresponding channel is output to the tuner 11 so that tuning is performed by inputting the broadcasting station name key.

As described in detail above, in the present invention, when the same broadcast signal is received in multiple channels during automatic channel selection, the field strength is largely input by comparing the electric field strength of the current broadcast signal with the electric field strength of the same broadcast signal previously stored. By storing the number of and adding the key indicated by the broadcast station name, the program of the desired broadcast station can be selected more easily, and the channel having a good transmission state can be selected.

Claims (2)

(Correction) A first step of checking whether a broadcast signal exists in a channel to be tuned when setting a channel, and if the broadcast signal exists in a tuning channel, decoding the main station name data outputted from the slice unit to recognize a broadcast station name. And reading the AGC data of the currently received broadcast signal, checking whether the current tuning channel is stored in the corresponding region of the memory, and if not, the channel data of the channel currently tuned in the corresponding station name address region of the memory. A third step of storing the AGC value, and if the data of another channel is already stored in the channel area of the broadcasting station name, the AGC value stored in the area is compared with the AGC value of the currently tuned channel. And a channel step for storing the channel data and the AGC value. (Correction) A / D converter 14 for converting the analog automatic gain control voltage AGC output from the intermediate frequency processing unit 12 into a digital signal, and the video signal Vi output from the intermediate frequency processing unit 12. A data slice section 15 for detecting broadcast station name data inserted in the < RTI ID = 0.0 >) < / RTI > and a channel key marked with the broadcast station name in addition to the general key to output various key signals, and through the infrared receiver 17 When the channel automatic tuning key signal is input, the tuning data is changed and output to the tuner 11, and the broadcast station name of the currently tuned channel is recognized on the basis of the output data of the data slice unit 15 at each channel tuning, and A / The auto gain control voltage of the corresponding channel currently input through the D converter 14 is compared with the auto gain control voltage previously stored in the memory 19 to store a channel for detecting a higher auto gain control voltage. And a microcomputer 18, characterized in that the channel automatic memory circuit by the station name key.