JPS6016797B2 - Multiplex signal regenerator - Google Patents

Description

[Detailed Description of the Invention] Recently, various kinds of character information are multiplexed and transmitted in a part of the direct retrace period of a television signal, and the viewer can select from among the multiplexed character information on the receiving side. By intermittently extracting only one type of character information and storing it in a semiconductor memory, it is formed into a signal with a series of information, and is converted into a main video signal (a video signal that occupies a period other than the above-mentioned direct retrace period). It is being considered to superimpose two types of information (multiple text and main video) on the screen of a television receiver at the same time.

An example of this is the NHK multiplex teletext C-system. This invention facilitates the selection of one type of multiplex program from among the various types of text information (hereinafter abbreviated as multiplex program).

That is, when selecting a program, the viewer first selects a certain broadcasting station by rotating the tuner or the like. Simultaneously with this selection, the main video signal appears. Next, if you wish to watch a multiplex program, select one program from among the multiplex programs shown in Table 1 using a push button switch for multiplex program selection provided separately from the tuner. This is what I did. Table 1 Example of a multiplex program When selecting this multiplex program, if there is no function to predict the type of multiplex program included in the radio waves of the selected broadcasting station by rotating the tuner, the selection of the multiplex program will be difficult. This will cause inconvenience.

In conventional broadcasting formats, only one type of program can be sent at the same time per broadcasting station, so you can simultaneously select a broadcasting station by turning the tuner and know the program content on the television screen. In a system that can send programs, all programs do not appear on the television screen at the same time after the tuner rotates, so it is not possible to know all the programs included in the radio waves of that broadcast station. For example, if a viewer selects a multiplex program that is not included in the radio waves of the broadcasting station currently being received, the information about the selected program will not appear on the television screen, so the television receiver will This can sometimes be mistaken for a malfunction. In order to prevent this, in the present invention, when selecting a multiplex program, immediately after selecting a broadcasting station by rotating the tuner, a button for multiplex program selection provided corresponding to each multiplex program is required. When pressing the button, a display lamp corresponding to the multiplex program being broadcast from the selected broadcasting station lights up to let the viewer know the type of multiplex program, making it easier to select the multiplex program. It is something.

According to this, viewers can learn the type of multiplex program being broadcast by the selected broadcasting station based on whether the indicator lamp is lit or not.
One program can be selected from the multiplexed programs that are lit. Generally, in this type of multiplex broadcast, the first
As shown in the example table, each multiplex program corresponds to a predetermined digital code.

This digital code is added before the character signal as shown in the signal waveform diagram in Figure 2 (i), and is used to extract only the character signal of the multiplex program selected by the viewer.
Figure (i) shows the transmission timing when a multiplexed program is divided and transmitted line by line.

One section is the transmission time for one line of each multiplex program, and one line is 30 minutes long.
line (a line is a scanning line), and each vertical women's line period (1'
If one line is sent every 6 inkstone cycles), then 0.5
seconds. The present invention will be further explained below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. Reference numeral 1 designates a shift register with serial input and 4-bit parallel output, connected to an input terminal IA to which a character signal is input.

and an input terminal IB to which a check signal is applied. 2 is 4
For example, when the number of programs is 12 as shown in Table 1, a decoder with input and 12 outputs decodes the types of 12 programs included in the received radio waves.

3A to 3L are AND circuits, and each output terminal 2 of the decoder 2
The outputs from A to 2L are each added as one input, and the other inputs are commonly connected and a timing pulse is applied to the terminal 3M.

4A to 4L are monostable multipipulators, and the program repeat cycle (
(number of programs x 0.9 stages) generates a pulse with a longer pulse width.

Reference numerals 5A to 5L are transistors which are grounded to the outside of each emitter, and lamps 6A to 6L are connected to respective collectors.

Transparent plates 7A to 7L display program names (see Table 1), and are selectively illuminated by lamps 6A to 6L to display the types of programs included in the received radio waves.

8A to 8L are pushbutton switches for program selection, all contacts on one side are grounded, and the other contacts are connected to a power source through resistors 9A to 9L, respectively, and a decoder with 12 inputs and 4 outputs. 1, respectively, are connected to twelve input terminals 11A to 11L.

Reference numeral 12 denotes a coincidence circuit which detects coincidence between the output of the shift register 1 and the decoder 11 when a timing pulse is applied to the terminal 3M mentioned above, and sends the result to the flip-flop 1.
Output to 3.

The flip-flop 13 is reset by the horizontal synchronizing signal applied to the input terminal 13A, and its output terminal goes to the "L" level, which is inverted by the matching output of the matching circuit 12 and goes to the "H" level, thereby opening the AND circuit 14. A memory 15 stores a character signal when applied to the input terminal IA when the AND circuit 14 is open.

FIG. 2 is a waveform diagram of each part for explaining the operation of the embodiment shown in FIG. 1. Figure 2 shows the waveform of the clock signal S2, which is also applied to the input terminal IB.The figure 2 side shows the waveform of the timing pulse S3 for coincidence detection, which is applied to the terminal 3M. It also shows the waveforms of the output pulses of the monostable multipipulators 4A to 4L in Figure 1. ), that is, it has a pulse width longer than (number of programs x 0.9 seconds).Next, the operation of the embodiment shown in Fig. 1 is explained in Figs. 2 and 3. I will explain while referring to it.

A character signal S containing the program code shown in FIG. 2(i) (see Table 1) is input to the input terminal IA and supplied to the shift register.

On the other hand, when a clock signal S2 as shown in FIG. 2(ii) is supplied to the other input terminal IB, the shift register 1
shifts the signal according to the clock signal S2. Four parallel outputs of the shift register 1 are input to a decoder 2, which decodes the type of program contained in the received radio waves.
Twelve output terminals 2A to 2L of the decoder 2 are applied to one trigger terminal of two-input AND circuits 3A to 3L, respectively. Further, each of the other trigger terminals of the AND circuits 3A to 3L is supplied with a timing pulse S shown in FIG.
2 is supplied through terminal 3M in FIG. Each of the monostable multipipulators 4A to 4L generates a pulse S4 having a pulse width longer than the repetition cycle of the program in response to the output of the AND circuits 3A to 3L, as shown in FIG. Supplies to 5A~, 5L base. Accordingly, the corresponding lamps 6A to 6L light up and illuminate the transparent plates 7A to 7L on which the corresponding program name (for example, the program shown in Table 1) is written, thereby being included in the received radio waves. Display the program type. Push button switches 8A to 8L for program selection provided on each of the transparent plates 7A to 7L for the 12 women (corresponding to the total number of programs) on which the program names are written are pressed. 12 input terminals 1 1A to 1 1L
Among them, only one input terminal corresponding to the selected pushbutton switch is grounded and becomes "L" level, and the others are "H" level.
'Level. Based on this input information, the decoder 1
1 outputs a predetermined 4-bit program code shown in Table 1. For example, if you operate the pushbutton switch 8A, which corresponds to the weather forecast in FIG.
Signals of ``0'', ``0'', ``0'', and ``1'' appear at the output terminals, respectively, and these are compared with the 4-bit signal supplied from the shift register 1 in the matching circuit 12.

This comparison is performed when a signal for specifying the timing for matching, that is, a timing pulse S3, is input. Based on the above signals, the match circuit 12 detects a match between the currently transmitted program code signal and the selected program code, and supplies the detection result to the flip-flop 13.

The flip-flop 13 is set in accordance with the output of the coincidence circuit 12, for example, if there is a match, it is set and outputs an "H" level signal, and if there is no match, it is not set and outputs a "L" level signal. Output. A horizontal synchronizing signal is input as a reset signal to the other input terminal of the flip-flop 13, and the flip-flop 13 is reset each time the horizontal synchronizing signal arrives, and the output terminal goes to the "L" level.

The output of the flip-flop 13 becomes "H" level during the period of the character signal S in FIG. 2 only when there is a match due to the two signals, the output of the matching circuit 12 and the horizontal synchronizing signal.

The output of the flip-flop 13 is input to one input terminal of the AND circuit 14, and the other input terminal receives the character signal S. is connected, and when there is a match (when the selected program is being received), only the character signal S, is outputted to the output of the AND circuit 14, and is supplied to the memory 15. If there is no match, the character signal S to the memory 15,
The offer will be blocked. The character signals stored in the memory 15 in this way are read out continuously and are read out from the cathode ray tube (
(not shown). Next, the operation of the embodiment shown in FIG. 1 will be explained in more detail, including the time relationship.

As an example, let us consider the case where the program code "001" (stock market conditions in Table 1) is transmitted as shown in FIG. 2 M in the waveform shown in FIG.

This program code is input to the shift register 1 by the clock signal S2 and shifted. The timing of this clock signal S2 is located approximately at the center of the timing of the program code being sent out, as shown in FIG. 2(i). Therefore, during the period between the time point at which the last bit of the program code is loaded into the shift register 1 and time t2 during the next clock pulse S2, the four parallel output terminals of the shift register 1 correspond to the program code.'' 00
It outputs a signal 101'. During this period from t to t2, the output of the decoder 2 is set to "H" only at the terminal 28 corresponding to the stock market condition by the output signal of the shift register 1.
level. By ANDing this signal with the timing pulse S3 located at the center at time t, only the monostable multipipulator 48 is driven. The width of the output pulse S4 of the monostable multipipulator 48 is chosen to be sufficiently longer than the time of the first line cycle of each program, as shown in FIG. 3(ii). Therefore, if the second line of the same program is sent out after the first line cycle, the same monostable multipipelator 4B will be driven for the second time before the first pulse is finished, and the output of the monostable multipipelator 4B will be persists until the next cycle.

The same goes for the third L Phantom Bee. As described above, by selecting the pulse width of the output pulse S4 of the monostable multipipulators 4A to 4L, a certain program can be displayed in a predetermined cycle (
The output pulses of the monostable multipipelators 4A to 4L maintain the 'IH' level as long as the output pulses are continuously sent at the cycle (period).

Therefore, when the stock market information is being transmitted, the monostable multipipelator 4B is driven, and when this stock market program continues in the predetermined cycle, the output of the monostable multipiperator 4B is " Maintains H” level. The output of the monostable multipipulator 4B drives the transistor 5B, lights up the lamp 6B, and illuminates the transparent plate 7B on which the stock market information is written, indicating that the stock market program is being transmitted. The lighting of the lamp 6B continues as long as the stock market program is being sent in a predetermined cycle (one cycle is the number of programs x 0.5 seconds) as described above. The same applies to other programs. As described in detail above, according to the present invention, the types of programs included in the received radio waves can be understood at a glance by the program display using the lamps, which has the excellent effect of making program selection extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing an embodiment of the present invention, FIG. Figure (i), (
ii) is a diagram for explaining the waiting time from when the viewer selects a program to be broadcast until characters appear on the television screen. In the figure, 1 is a shift register, 2 is a decoder, 3A to 3L
is an AND circuit, 4A to 4L are monostable multipipulators, 5A to 5L are transistors, 6A to 6L are lamps, 7
A to 7L are transparent plates, 8A to 8L are push button switches, 9
A~9L are resistors, 10 is a power supply, 11 is a decoder, 12
13 is a flip-flop, 14 is an AND circuit, and 15 is a memory. Figure 2 Figure 3 Figure 1

Claims (1)

[Claims] 1. A device for extracting a multiplexed signal inserted into a television signal and storing it in a memory, and then reading out the multiplexed signal as a signal having a series of information from the memory and displaying it on the screen of a television receiver. a decoder that extracts a code signal representing the type of program contained in the multiplexed signal and generates a signal at an output terminal corresponding to each program type; and a signal appearing at each output terminal of the decoder. A pulse generating circuit that is driven and outputs a pulse having a pulse width equal to or longer than a repetition period of the program, and means for displaying the type of program included in the multiplex signal based on the output of the pulse generating circuit. A multiplex signal reproducing device characterized by: