JPS5892181A - Multiplex signal receiver - Google Patents

Abstract

PURPOSE:To attain video recording reproduction of screen with title, by synthesizing a superimposing signal used for title superimposition and a composite video signal and generating a synthesized video signal. CONSTITUTION:In a synthesized video signal generating circuit, a superimposing signal is applied to the base of a transistor(TR)35 via a potentiometer 32, and a composite video signal is applied to an input terminal 39 to the base of the TR 35. A superimposing signal switching signal is applied to an input terminal 41, inverted at an inverter 38, and applied to the cathode of a diode 36 and also to the cathode of a diode 33 via an inverter 37. When a superimposition signal switching signal synchronized with the superimposition signal is logical level (1), the diode 36 is conductive, the TR 35 turns off, the TR 34 turns on and the superimposing signal is outputted from an output terminal 40. When the logical level is (0), the diode 36 turns off, the TR 35 turns on, the diode 33 turns on, and the TR 34 turns off, and the composite video signal is outputted from a terminal 40.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on a multi-electronic signal receiving device, and among various types of video (for example, full-screen fixed display, super display, etc.) that are reproduced and displayed on a display device using nine multiplexed signals. , if the luminance signal (hereinafter referred to as the super signal) of the signals of the subtitles sent in synchronization with the program is equal to 4 VL with the composite video signal without subtitles, then from K, the video tape recorder (hereinafter referred to as the super signal) is , VTR) and other video information recording devices, and when reproduced, the 11 subtitled images can be obtained.

First, teletext will be explained.

In the March 1956 report by the IT Wave Technology Committee regarding the text broadcasting pattern system, the format of subtitles to supplement the content of television broadcast programs was established as one of the display formats. Although this subtitle superimposition was mainly considered for people with hearing loss, it can also be applied to other programs (for example, Western movies, operas, etc.) for people with normal hearing.

When a hearing-impaired person uses a VTR to record various broadcast programs, if subtitles can be recorded at the same time, for Kensato Maku, if he can record a program with subtitles like the one mentioned above, he will be able to record the subtitles during playback. The ability to record images with subtitles is extremely effective as the service is played back at the same time.

However, in general, in the normal multiplexed signal receiving device 1, the video displayed on the display device is the R and G demodulated normal television video signal.

A B output signal or three color difference signals, a luminance signal, and each R, G, and B color output signal of various multiplexed signals are switched and displayed by a switching circuit. For this reason, ordinary VTRs and other video imaging devices record only composite video signals, making it impossible to record videos with superimposed subtitles as described in 11rj.

Therefore, the present invention extracts the multiplexed signal superimposed in the form of a binary pulse signal within the vertical retrace period of the composite video signal,
A multiplexed signal receiving device for displaying the multiplexed signal after storing it in a memory is provided with a synthesizing means for synthesizing the super signal used for subtitle superimposing of the multiplexed signal and a composite video signal without subtitles to generate a composite video signal. This makes it possible to record video with subtitles, and one embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

1st v! JVi shows the main block configuration of an embodiment of the multiplexed value @ receiving device according to the present invention, where claw 1) is an input terminal for a composite video signal, (2) is a composite video signal processing circuit, and (3) is a normal processing circuit. a switching circuit that switches and outputs a decoded video signal and a decoded multiplexed signal, (401 display device tj, (
5) Delay circuit that delays the Fi composite video signal, (6) Fi
A composite video signal generation circuit with subtitles, (7) is an output terminal for the composite video signal, (8) is an analog signal processing circuit that performs analog signal processing of the multiplexed signal, and (9) is an analog signal processing circuit (8 ) is a digital signal processing circuit that performs various data processing using the output of a memory element. Q
This is a super signal output circuit that outputs only the super signal of the OFi multiplexed signal.

A composite video signal including nine multiplexed signals applied to the input terminal (1) is processed by a composite video signal processing circuit (2) and a delay circuit (5).
and an analog signal processing circuit (8).

Composite video signal processing circuit (2) K applies appropriate signal processing to the added composite video signal, and its output is applied to one input of switching circuit (3). The composite video signal applied to the delay circuit (5) is a multiplexed signal that is applied to the analog signal processing circuit (8).
), with a time delay corresponding to the time to be processed by the digital signal 5j processing circuit (9) and the super signal output circuit OQ,
It is added to the composite video signal generation circuit (6). In addition, the composite video signal applied to the analog signal processing circuit (8) generates horizontal and vertical synchronization signals, sampling clocks, slice data, etc. in the analog signal processing circuit (8), and is sent to the digital signal processing circuit (9). supply The digital signal processing circuit (9) reproduces nine multiplexed signals from these received signals in accordance with each of the display formats mentioned above, and supplies them to the super signal output circuit 0Q and the other input of the switching circuit (3). A signal switching signal is supplied to a composite video signal generation circuit (6)K. The super signal output circuit GQ supplies only the super signal to the composite video signal generating circuit (6) K based on the super signal switching signal obtained from the digital signal processing circuit (9). On the other hand, the switching circuit (3) switches the various multiplexed signals obtained from the digital signal processing circuit (9) and the video signal obtained from the composite video signal processing circuit (2) and supplies them to the display device 1 (4). You can then view the desired image. In addition, the synthetic Eirin signal generation circuit (6
), the composite video signal obtained from the delay circuit (5) and the super signal obtained from the super signal output circuit aO are converted into the super signal by the super signal switching signal obtained from the digital signal processing circuit (9). Only at this time, the composite video signal portion is replaced with a super signal to produce a composite video signal, and is supplied to the output terminal (7).

Figure 2 Fi shows the main parts prices J & technique of Figure 1. Figure 2 (&
) is the composite video signal waveform of the delay circuit (5) output, (b) is the suit 4-signal waveform of the super signal output circuit θQ output,
(c) shows a composite video signal waveform output from the composite video signal generation circuit (6), and (d) shows a super signal switching signal waveform output from the digital signal processing circuit (9). The horizontal axis t in the figure represents time, and the vertical axis represents DC voltage level.

FIG. 3 shows a specific circuit diagram of the composite video signal generation circuit (6), where cln is an input terminal to which the super signal [FIG. 2 (b)] output from the super signal output circuit Q1 is supplied;
is a volume for adjusting the level of the super signal, -1 is a switching diode, @4- is a transistor, 6"7) M
is an inverter, - is an input terminal to which the composite video signal output from the delay circuit (5) is supplied, and 純 is an output terminal for the composite video signal.
The circle is an input terminal to which the super signal switching signal output from the digital signal processing circuit (9) is input as switching/4 pulses;
(6) is a DC power supply terminal.

The super signal shown in Figure 2 (b) is applied to the transistor pace through the volume (to), and the composite video signal shown in Figure 2 (maro) is applied to the transistor pace from the input terminal. . In addition, the super signal switching value JijVi of Fig. 2 (d+) is applied to the JijVi input terminal @υ, inverted by the inverter (to) and applied to the cathode of the diode -, and further passed through the inverter (b) to the cathode of the diode -. Now, when the super signal switching signal synchronized with the super signal is at logic level "1" (5V),
When the diode-FiONL and the transistor are turned off, the diode is turned off and the transistor is turned on, and the bus-bar signal is output from the output terminal (4I). [O
v], the diode becomes opp, 4, and the transistor is turned on.

The diode turns on and the transistor turns off,
A composite video signal is output from the output pane 4.

As explained above, according to the multiplexed signal receiving device of the present invention, a composite video signal is generated by combining a super signal and a composite video signal without subtitles.
By recording and reproducing with R or other video recording device, it is possible to record and reproduce a screen with subtitles for supplementing the program.

In addition, by using the composite video signal as an input signal of another video input terminal-equipped video display device, it is possible to easily display an image with subtitles as described above,
The effect is also great.

[Brief explanation of drawings]

FIG. 1 is a block diagram of main parts of a multiplexing ratio 5 receiving device according to an embodiment of the present invention, @2 (Jl), (b), (C
), (d) are signal waveform diagrams of each part in Figure 1, and Figure 3 is the signal waveform diagram of each part in Figure 1.
FIG. 2 is a specific circuit diagram of the main part of the figure. (1) - Composite video signal input terminal, (2) - Composite video signal processing circuit, (5) - Delay circuit, (6) - Composite video signal generation circuit, (7) - Composite video signal output terminal, (
8)...Analog signal processing circuit, (9)-...Digital signal processing circuit, 00...Super signal output circuit Fig. 1 Fig. 2

Claims (1)

[Claims] 1. The multiplexed signal superimposed in the form of a binary pulse signal within the vertical retrace period of the composite video signal is extracted, stored in a memory, and then displayed, and Iffff
A multiplexed signal receiving device is configured to generate a composite video signal by combining a super signal used for subtitle superimposition among the formatted signals and a composite video signal without subtitles.