JPH01221080A - Text signal processor - Google Patents

Abstract

PURPOSE:To excellently record a text signal with a VTR, etc., by providing terminals to output a luminance signal and a chroma signal independently of each other and outputting a video signal instead of a luminance signal during a period of a character signal. CONSTITUTION:A character signal separating circuit in a given horizontal period and a signal from a separator are supplied to a character signal decoder 8, to conduct the restoration of text information, etc., and display signals, RGB signals for a character image, etc., are formed. Also, a luminance signal from a YC separator circuit 9 and a video signal from a switch 4 are supplied to a switch 16, and this switch 16 is controlled by a control CTL signal that is formed only during the period of a character signal from a separator circuit 7. A luminance signal and a chroma signal separated by the circuit 9 are taken out to the video output terminals 17, 18 for a high-resolution VTR, and at the same time, only during the period of a character signal, this luminance signal is substituted from a video signal in the stage prior to the circuit 9. As a result, an excellent text multiple signal without any irregularity in the waveform of a character signal can be recorded in a VTR, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a character multiplex signal processing device that receives a character multiplex signal and forms a display signal.

[Summary of the invention]

The present invention relates to a character multiplex signal processing device, which provides a terminal for independently outputting a luminance signal and a chroma signal, and outputs a video signal instead of a luminance signal during a character signal period, thereby producing a character multiplex signal in a VTR or the like. This makes it possible to record data well.

[Conventional technology]

In the so-called character multiplex signal, the 14th
, 15, 16, and 21 character data signals are multiplexed in periods 1, 1, 1, 1, and 21. Since such character signals contain many high frequency components, they cannot be recorded on conventional consumer VTRs.

On the other hand, in recent years, the resolution of consumer VTRs has been increasing, and VTRs capable of recording even the high frequency components of the above-mentioned character signals have been put into practical use.

[Problem to be solved by the invention]

However, in general, consumer VTRs use a so-called comb filter that utilizes the vertical correlation of video signals to separate and process luminance signals and chroma signals during recording. In that case, since the above-mentioned character signals do not have vertical correlation, the waveform of the separated signal is greatly disturbed, and therefore it is difficult to restore and decode the character signal from the signal recorded and reproduced. had become extremely difficult.

On the other hand, VTRs that record such character multiplex signals
For example, a device as disclosed in Japanese Patent Laid-Open No. 60-218988 has been proposed.

However, in this device, the timing is not necessarily accurate because the signals are switched based on the synchronization signal, and there are various inconveniences in uniformly performing such processing even on video signals that are not multiplexed. may occur.

By the way, the above-mentioned high-resolution VTR is generally provided with means for inputting and outputting the luminance signal and chroma signal separately.

This application was filed in view of these points.

[Means for solving the problem] The present invention separates character signals in a video signal (circuit (7)).
A means (decoder (8)) for decoding the character signal to form a display signal is provided, and a circuit (9) separates the luminance signal and chroma signal of the video signal. Terminal α7) that independently outputs
a8 is provided, and means (switch α) for outputting the video signal to the independent terminal instead of the separated luminance signal during the period for separating the character signal (CTL signal)
This is a character multiplex signal processing device characterized by being provided with e).

[Effect]

According to this, the signal switched to the video signal during the character signal period is output to the luminance signal terminal, so that by using this signal, it is possible to record a good character multiplex signal on a VTR or the like.

〔Example〕

In Fig. 1, the signal from the antenna (1) is distributed by the RF distributor (2) and taken out to the terminal (2a).
, is supplied to the tuner (3) for channel selection and video (Video).
o) Demodulation of the signal is performed. This demodulated video signal is supplied to a waveform equalization circuit (5) and a synchronous separation circuit (6)K via a switch (4), and the signal from the separation circuit (6) is supplied to an equalization circuit (5)K. The waveform equalization necessary for character signal extraction is performed. This waveform-equalized signal and the signal from the separation circuit (6) are supplied to the character signal separation circuit (7), and the so-called preamble of the character signal is detected in the above-mentioned predetermined horizontal period. The signal that is determined to be a character signal is separated and extracted. The separated character signal and the signal from the separation circuit (6) are supplied to a character signal decoder (8)K, character information, etc. are restored, and character image display signals (RGB signals), etc. are formed.

Further, the video signal from the switch (4) is supplied to a luminance (Y) and chroma (C) signal separation circuit (9) consisting of a so-called comb filter, and the separated luminance signal and chroma signal are converted to an RGB signal demodulation circuit. (IGK is supplied. The demodulated nine RGB signals of this video signal and the RGB signals of the character display signal from the decoder (8) are supplied to the RGB switching circuit aυ, which switches the character display signal from the decoder (8). The YS and YM double signals that specify the display position, etc. are controlled.The video signal and the character display signal are thereby switched and combined.The signal from this switching circuit αυ is supplied to, for example, an NTSC system encoder a3, and is encoded. A predetermined video signal is output to a video output terminal a3 connected to a video input of a TV receiver (not shown).
Therefore, the encoded luminance signal and chroma signal are output to the video output terminal α4a9, and these terminals α4a9 are connected to the TV.
If the receiver is provided with separate inputs for luminance signals and chroma signals for connection with the above-mentioned high-resolution VTR, these terminals are connected.

In addition, the luminance signal from the separation circuit (9) and the video signal from the switch (4) are supplied to the switch 1G, and this switch Ql is a control (CTL) that is formed only during the period of the character signal from the separation circuit (7). Controlled by signals. The signal from this switch ae and the chroma signal from the separation circuit (9) are
The signal is output to the video output terminal a'7)α♂ which separates and supplies the luminance signal and chroma signal to the above-mentioned high-resolution VTR (not shown).

Furthermore, the RGB signal from the switching circuit αυ and the decoder (8)
The Y3 and YM double signals from the so-called 21-pin input/output device are output to the terminal (11 (21). Also, the video signal from the switch (4) and the synchronization (5ync) signal from the decoder (8) are It is selected by the switch (211) and output to the terminal included in the 21-pin input/output device.

Also, the signal from the tuner (3) is an audio signal demodulating circuit C.
) 31 and the demodulated audio signal is supplied to the switch (c) via the switch (24). Also, the additional sound signal in the character signal restored by the decoder (8) is supplied to the switch (c), and the selected signal is included in the audio output terminal (c) for the TV receiver and the 21-pin input/output device. Output to terminal -. Furthermore, the signal from switch e41 is the audio output terminal C for high resolution VTFL! Output into barrels.

Furthermore, a video signal with separate luminance and chroma signals from a high-resolution VTR is supplied to an input terminal @(7), and these signals are added by an adder C3D. A signal from this adder Gυ and an external (Ext) video input terminal o7J.

Signals from terminals (to) included in the 21-pin input/output device are arbitrarily selected and supplied to the switch (4). In addition, the audio input terminal (2) from a high-resolution VTR, the external audio input terminal (to), and the terminal included in the 21-pin input/output device (
The signals from the switches (4) and (2) are arbitrarily selected and supplied to the switches (2).The switches (4) and (2) and (c) are controlled by the user's free will by remote control or the like.

Therefore, according to this device, the luminance signal and chroma signal separated by the separation circuit (9) are taken out to the video output terminal <17)H for high resolution VTR, and this luminance signal is separated only during the character signal period. By switching to the video signal at the previous stage of the circuit (9), it is possible to record a good text multiplex signal without waveform disturbance of the text signal on a VTR or the like.

In other words, according to this device, extremely accurate control (CT
L) The luminance signal and the video signal can be switched using the signal. Therefore, the above-mentioned control signal can be corrected by the so-called framing code of the character signal, forward protection, and backward protection α7, and the risk of malfunction is extremely low, and the risk of malfunction especially in the case of a weak electric field is reduced. Can be done.

Note that when the above-mentioned device is used in combination with a conventional consumer VTR, the output terminal a3 (c) for the TV receiver can be branched and connected in parallel to output video signals, character display signals, and Audio signals and additional sound signals can be recorded.

〔Effect of the invention〕

According to this invention, since the signal switched to the video signal during the character signal period is output to the luminance signal terminal, by using this signal, it is possible to record a good character multiplex signal on a VTR or the like. It became so.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an example of the present invention. (7) is a character signal separation circuit, (8) is a character signal decoder, (9) is a luminance and chroma signal separation circuit, αe is a switch, and Ql is an output terminal.

Claims (1)

[Scope of Claims] Means is provided for separating a character signal in a video signal and decoding this character signal to form a display signal, and also for separating a luminance signal and a chroma signal of the video signal and decoding the luminance signal and chroma signal. A terminal for outputting the signal independently is provided, and means is provided for outputting the video signal to the independent terminal in place of the separated luminance signal during the period in which the character signal is separated. Characteristic multiplex signal processing device.