KR960007203B1 - Time display device - Google Patents

Abstract

a clock generator for generating a clock signal of a predetermined period, a counter for counting the clock signal, a first converter for converting a counter value by the counter into a visible information, and a displaying device for displaying the visible information, where the visible data displaying device further includes: a tuner for tuning and demodulating a TV signal of a predetermined channel; a decoder for decoding a text multiple signal multiplexed with the TV signal supplied from the tuner; a visible data extractor for separating visible data out of the text multiple signal supplied from the decoder; a second converter for inputting the visible data from the visible data extractor and converting it into the counter value of a corresponding clock signal with reference to the period of the clock signal; and a presetting means for controlling the counter value converted by the second converter to be preloaded on the first counter.

Description

Visual display device

1 is a diagram showing a signal form of a horizontal scan line multiplexed with a KBPS signal.

2 is an embodiment of a visual display device according to the present invention.

3 is another embodiment of a visual display device according to the present invention.

4 is another embodiment of a visual display device according to the present invention.

The present invention relates to a visual display device, and more particularly, to a system for broadcasting multiplexed encoded standard time information to a television signal to detect standard time information through an appropriate decoder, and to detect the detected time through a display device. The present invention relates to a time display device that provides information or provides time information corrected as a detected time.

Increasingly, devices having a time display function and a built-in electronic clock are increasing according to the multifunctionalization of electronic devices. In addition, as the reservation setting function using the microcomputer is expanded, an internal clock for detecting the start point or the end point of the reservation operation is required. For example, in the reservation operation of a video recorder, the start time and length of a program input by a user are stored in the memory as a target value, and the microcomputer controlling the device compares the time of the internal clock with the time set as the target value. If it matches, control is started to record. The internal clock is also monitored to control the recording to stop when the set time length elapses. Therefore, if the time of the internal clock is incorrectly set or there is an error in the operation of the internal clock, correct reservation recording cannot be performed.

However, some problems exist in actual sequence control by the internal clock. First of all, the internal clock starts the time counting operation by the user's initial setting, but the error of the reference time at the initial setting and the error due to the setting time cannot be avoided. Secondly, the internal clock counts the built-in clock signal source and converts the count value into corresponding time data so that the error due to the inaccuracy of the clock signal source cannot be avoided.

Accordingly, an object of the present invention is to provide a visual display apparatus for displaying time information provided by a standard time signal that can be authorized.

Another object of the present invention is to provide a time display apparatus for correcting a time set as time information provided by a standard time signal that can be authorized.

A visual display apparatus of the present invention which achieves the above object comprises: a decoder for decoding digitally encoded information transmitted in multiplex to a television signal; A time data extractor for separating time data from the decoded information at the decoder; And a display device for displaying the time data in the time data extractor.

According to another aspect of the present invention, there is provided a visual display apparatus comprising: a decoder for decoding digitally encoded information transmitted multiplexed on a television signal; A time data extractor for separating time data from the decoded information; A second converter for converting the time data in the time data extractor into coefficient values of a corresponding clock signal; And preset means for loading the converted coefficient value into a preset value of the counter. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention is characterized by using the time information included in the encoded data transmitted by being multiplexed on television broadcasting as a reference time that can be recognized.

Data broadcasting refers to a broadcasting system that transmits various types of digitally encoded information that does not exist in an audio signal or a video signal, and includes teletext, VPS (Video Program System), VPV (Video Program Video Recorder), and KBPS (Korean Broadcastin Program System). ) Has been put to practical use.

Data broadcasting adopts advanced compression encoding method to transmit various types of information, compared to voice broadcasting and television broadcasting, and enables high efficiency transmission.

In data broadcasting using voice signals, data is transmitted in the form of a MSK (mininum shift keying) modulated signal at low frequencies in AM, and a carrier is provided at the upper side of the subchannel in FM.

In data broadcasting using a television signal, non-return to zero (NRZ) modulated information is transmitted by multiplexing the vertical blanking interval (VBI) of the television. One example is the VPS, which has been in operation since 1985 in the Federal Republic of Germany. This is a method of transmitting a control signal for automatically recording a program to the VTR. The VPS signal is multiplexed on the 16th line of the feed signal and transmitted. The VPS signal is composed of 15 words each consisting of 8 bits, of which the 11th to 16th words are provided as data for controlling the video record.

In Korea, KBPS (Korean Broadcasting Program System) is provided. KBPS transmits 36 words each consisting of 8 bits on a specific horizontal scan line during the vertical retrace period.

1 is a diagram showing a horizontal scan line multiplexed with data in KBPS. The KBPS signal is transmitted in multiplex to one or more horizontal scan lines transmitted during the vertical retrace period of the even and odd feeds. As shown in FIG. 1, the KBPS signal is transmitted for a period of 51 uS except for the horizontal synchronization signal and the burst synchronization signal. The high level of the KBPS signal is 70 IRE equal to the back level and the low level has a value of 0 IRE equal to the pedestal level. In the case of 36 words consisting of 8 bits during the 51uS period, the clock frequency is 5.7272 MHz.

The KBPS signal is composed of 36 words, and each word can be classified into a synchronization signal part, a header part, and a data part. The synchronization signal portion occupies the first word Word1 to the third word Word3. The header portion occupies the fourth word Word4 to the tenth word Word10 and the data portion occupies the rest.

TABLE 1

The synchronization signal portion is constituted as a clock synchronization signal and a byte synchronization signal. The clock synchronization signal uses Word1 and Word2 as reference signals for matching the data clock synchronizer of the KBPS signal received from the KBPS receiver, and its value is " 1010 1010 1010 1010 ". The byte synchronization signal is a framing code and is a reference signal for fitting byte synchronization. The signals in the data section are allocated in units of bytes and are used to select the position of the first byte in the bit sequence because the correct data cannot be recovered if any one bit in the bit sequence is missing or an error occurs. The byte sync signal uses Word3 and its value is "1000 0100".

Table 2 shows the configuration of the header portion of the KBPS signal.

TABLE 2

The header portion is configured as a feed counter FC, a packet type PT, a packet structure PS, a program counter PC, and a program sub counter PSC. FC and PT are essential data and PS, PC and PSC depend on the type of PT.

FC is composed of Word4 and is used for continuity test of video signal and free run to 0- ＄ F value. PT is composed of Word5 and indicates the type of data part and has a value of O- ＄ F.

PS is composed of Word, 7 and indicates the length of valid data block. The upper five bits of the two bytes indicate the length of the valid data block of the data portion. The maximum length of the valid data block of the data portion is 28. The lower 3 bits indicate the type of data block. If the lower 3 bits are "000", the contents of the data block indicate the KBPS LABEL, time, and title (8 characters) of the broadcast program. In case of "001-010", when the title of a broadcast program exceeds 8 characters, it is used continuously. In the case of "011-111", it indicates the summarized information of the broadcast program.

The PC displays the order of the broadcast date when transferring Weekly data as Word8. Displays the serial number according to the date increase based on the current broadcast date. Using a PC, you can find the start point and end point of the Weekly data. The PC can count from 0- $ F as 1 byte, so it can display a total of 2 weeks.

The PSC displays the serial number for each broadcast program corresponding to each date in the daily data contained in the Weekly data as Word 9 and 10. The lower 7 bytes of the 2 bytes indicate the serial number of the broadcast program, and the upper 1 bit is set as the control signal when changing the date of the program on the day.

Table 3 shows the structure of the data according to the value of PT.

TABLE 3

③ PT = 2; UP-DATE KBPS LABEL; UP-DATE LABEL NO + KBPS LABEL + UPDATA LABEL of the current day

(Assignment for REC unavailability by overlap)

④ PT = 3; CHANGE MODE KBPS LABEL; CHANGE MODE No + KBPS LABEL changed + UP-DATE LABEL changed + DISPLAY DATA changed

(When program change or cancellation is made)

⑤ PT = 4-7; WEEKLY KBPS LABEL (Word11-36); KBPS LABEL + Program Time (for Display) + Program Title

a. If the lower 3 bits of the PS is "000"

b. If the lower 3 bits of the PS is "001"-"010"

c. If the lower 3 bits of PS are "011"-"111"

If the PT is "000", the NET-Q station used for the control system between local broadcasting stations is transmitted. When the PT is "001", the ON-AIT KPBS LABEL signal, which is the current time, the name of the broadcasting station, and the status information of the currently broadcast program, is transmitted. If the PT is "010", the UP-DATE KBPS LABEL number, the current KBPS LABEL, and the UP-DATE LABEL are transmitted for the KBPS LABEL in the UP-DATE mode. If the PT is "011", the number of the CHANGE MODE, the changed KBPS LABEL, the changed UP-DATE LABEL, and the changed display data are transmitted for KBPS LABEL of the CHANGE mode. If the PT has a value of "100" to "111", KBPS LABEL, program time, and program title are transmitted for WEEKLY KBPS LABEL for 1 to 4 weeks, respectively.

As shown in Table 3, when the packet type PT has a value of 1, the data transmitted to the data block has current etching data.

Table 4 shows the types of KBPS LABELs.

TABLE 4

As shown in Table 3, when the packet type PT has a value of 1, the data transmitted to the data block includes the current time. The present invention is characterized in that it adopts data broadcasting as a reference signal source that can be recognized as such.

Shown in Figure 2 is one embodiment according to the present invention. In the simplest form, the visual display device 20 of FIG. 2 includes a decoder 21 for decoding digitally encoded information transmitted by being multiplexed on a television signal, and a visual data extractor for separating visual data from the decoded information. 22) and a display device 23 for displaying the extracted visual data.

The operation of the visual display device by the configuration in FIG. 2 will be described in detail. The television signal in the tuner 10a is supplied to the image processing unit 10b for generating the reproduced image and also to the decoder 21 for decoding the encoded information multiplexed on the television signal.

The decoder 21 separates, demodulates and blocks the digitally encoded information in the vertical blanking section of the input television signal, and outputs it to the visual data extractor 22.

The time data extractor 22 examines the packet type PT in the input data block and separates only the time data from the data of the data block and supplies it to the display device 23 when PT = 1. The display device 23 converts the time data in the time data extractor 22 into appropriate time information and provides it as the current time.

3 is another embodiment of a time display device according to the present invention, which includes a clock signal source, a counter for collecting the clock signal, a converter for converting the clock value into a time data, and a display device for displaying the converted time data. It is a device for periodically correcting the count value of a conventional time display device based on the reference time information.

The visual correction apparatus shown in FIG. 3 includes a decoder 31 for decoding digitally encoded information transmitted by being multiplexed on a television signal, a time data extractor 32 for separating time data from the decoded information, and a time data extractor. A second converter 33 for converting the time data of the clock into a count value of a corresponding clock signal, a preset means 34 for loading the converted count value into a preset value of the counter, and counting the clock signal to obtain a constant value. And a second counter 35 which periodically drives the preset means each time a count value is reached.

In the operation of the time display device according to the configuration of FIG. 3, the clock signal generated by the clock generator 36 is counted by the first counter 37 and appropriately passed through the first converter 38 and the display device 39. Provided as time information.

On the other hand, visual information included in the encoded information multiplexed in the television signal is supplied to the decoder 31 through the tuner 30. The decoder 31 separates / decodes and blocks the digitally encoded information in the vertical blanking section of the input television signal and outputs it to the visual data extractor 22. The time data extractor 32 checks the packet type PT in the input data block and separates only the time data from the data of the data block and supplies it to the second converter 33 when PT = 1. The second converter 33 converts the time data into a coefficient value suitable for the first counter 37 and supplies it as a preset value.

The second counter 35 counts the clock signal generated by the clock generator 36 and supplies it to the preset device 34, and the preset device 34 periodically generates an input counter value that reaches a constant count value. This generates a control signal for presetting the first counter 37.

4 is a further embodiment of the visual correction apparatus according to the present invention and has a configuration similar to that of the visual display apparatus shown in FIG. Therefore, the same reference numerals are used for the same components as in FIG. 3, and a detailed description thereof will be omitted.

In the time display device of FIG. 4, a preset value indicating the current time is supplied to the first counter 37 through the decoder 31, the time data extractor 32, and the second converter 33. . The preset value includes reset means 40 for detecting the reset state at the beginning of operation of the visual display apparatus and driving the preset means.

As described above, the time display device according to the present invention can provide accurate time information by extracting and displaying time data transmitted by being multiplexed on a television signal as standard time information that can be recognized.

In addition, the time display device according to the present invention counts clock signals generated from an internal clock signal source, converts the counted value into time data, and provides the time information as a standard time information that can be recognized in addition to the time display device. By correcting the time of the time display device, it is possible to perform stable time display with respect to the abnormal operation of the clock signal source provided inside the time display device.

Claims (3)

A clock generator for generating a clock signal of a predetermined period, a first counter for counting the clock signal, a first converter for converting a value counted by the first counter into time information, and time information resulting from the first converter A visual display device comprising: a tuner for tuning and detecting a television signal of a predetermined channel; A decoder which receives a television signal provided from the tuner and decodes the transmitted character multiplex signal multiplexed on the television signal; A visual data extractor for separating visual data from character multiplex signals provided by the decoder; A second converter for introducing time data from the time data extractor and converting the time data into coefficient values of a corresponding clock signal with reference to a period of the clock signal; And preset means for controlling the coefficient value converted by the second converter to be preloaded into the first counter. The visual display apparatus of claim 1, further comprising a second counter for forming the preset means whenever the clock signal is counted to reach a predetermined count value. The visual display apparatus of claim 1, further comprising reset means for detecting a reset state at an initial stage of operation of the visual display apparatus to drive the preset means.