JP3147726B2 - Video signal processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal processing apparatus, and more particularly to a video signal processing apparatus for processing a television video signal in which signals of different types such as NTSC and EDTV-2 are mixed.

[0002]

2. Description of the Related Art A 16: 9 wide aspect ratio video signal system including a high-quality information signal can be transmitted and received together with a signal of the current 4: 3 aspect ratio NTSC system. A certain EDTV-2 system has been studied, and the result of the study was reported to the Ministry of Posts and Telecommunications on January 23, 1995, and commercialization is scheduled for July of the same year.

In the EDTV-2 system, a letter box format is adopted, and a broadcast signal of an EDTV image having an aspect ratio of 16: 9 according to the current NTSC system having an aspect ratio of 4: 3 is received by a current receiver. Has 30 non-image portions per field at the top and bottom, respectively, and has 180 aspect ratios per field at the center of the screen.
Nine main picture images are allocated.

A horizontal resolution enhancement signal is superimposed on the main picture area by frequency multiplexing, and two types of vertical resolution enhancement signals are multiplexed on the upper and lower non-picture areas. An identification control signal indicating the signal state of the -2 signal is arranged. The display scanning is performed by a non-interlace method.

The video signal processing apparatus compatible with the EDTV-2 signal uses the information of the identification control signal in the signal,
Reproduces horizontal and vertical resolution augmentation signals and uses the current NTS
At the same time as providing images with higher image quality than the C signal,
9 can be realized with a wide aspect ratio.

[0006] Further, the EDTV-2 signal includes a simple EDTV signal which does not include a vertical resolution enhancement signal.

Referring to FIG. 5 which shows a block diagram of a conventional EDTV-2 compatible video signal processing apparatus, this conventional video signal processing apparatus outputs a horizontal / vertical resolution enhancement signal when an input video signal VI is an EDTV-2 signal. An EDTV signal processing unit 1 that reproduces and outputs a signal a; a simple EDTV signal processing unit 2 that reproduces a horizontal resolution enhancement signal when the input video signal VI is a simple EDTV-2 signal and outputs a signal b; NT that outputs signal c when signal VI is an NTSC signal
The SC signal processing unit 3 and the input video signal VI are EDTV-2
A discrimination control signal detecting section 4 for detecting a discrimination control signal when outputting a signal and outputting a control signal ST including signal form information; and a signal processing switching for outputting switching signals S1, S2 and S3 in response to the supply of the control signal ST. A signal switching unit 6 for selecting one of the signals b and c in response to the supply of the switching signal S1 and outputting a signal d; and outputting a signal e by performing an aspect conversion process in response to the supply of the signal d. An aspect conversion processing unit 7, a signal switching unit 8 that selects one of the signals d and e in response to the supply of the switching signal S2, and outputs a signal f, and performs a sequential scanning process in response to the supply of the signal f. A sequential scanning processing section 9 for outputting a signal g, and signals a, f, and
g, which selects one of the signals g and outputs the output signal VO
0.

Next, the operation of the conventional video signal processing apparatus will be described with reference to FIG.
I denotes an EDTV signal processing unit 1, a simple EDTV signal processing unit 2, an NTSC signal processing unit 3, and an identification control signal detection unit 4
Supplied to The discrimination control signal detection unit 4 receives the input signal VI
Is an EDTV-2 signal, an identification control signal is detected and a control signal ST is output. If the input signal VI is an EDTV-2 signal, the EDTV signal processing section 1 outputs a signal a obtained by reproducing a horizontal / vertical resolution enhancement signal. If the input signal VI is a simple EDTV-2 signal, the simple EDTV signal processing unit 2 outputs a signal b obtained by reproducing the horizontal resolution enhancement signal.
Further, if the input signal VI is an NTSC signal, NTSC
The signal processing unit 3 performs a predetermined process and outputs a signal c. The signal processing switching unit 5 outputs switching signals S1, S2, S3 in response to the supply of the control signal ST.

The signal switching section 6 selects one of the signals b and c in response to the supply of the switching signal S1 and supplies it to the aspect conversion processing section 7 and the signal switching section 8 as a signal d. When the signal d is the signal b, that is, the horizontal resolution enhancement signal, the aspect conversion processing unit 7 converts the signal d into a horizontal signal having an aspect ratio of 16: 9 and outputs a signal e. Next, the signal switching unit 8 selects one of the signals d and e in response to the supply of the switching signal S2, and sequentially selects the signal d and the signal e as the signal f and sequentially switches the scanning processing unit 9 and the signal switching unit 1 to each other.
Supply 0. When the signal f is the signal e, that is, the signal subjected to the aspect conversion processing, the progressive scanning processing section 9 generates a progressive scanning signal g for non-interlaced scanning display. The signal switching unit 10 selects one of the signals a, f, and g in response to the supply of the switching signal S3 and outputs the selected signal as the output signal VO.

This conventional video signal processing apparatus performs processing in accordance with the presence / absence of an identification control signal and information on the identification control signal, so that video signals of two different systems, NTSC and EDTV-2, are generated in a short period of time. Switching occurs or EDT
Even in the case of the V-2 signal, the display of the image receiving display unit on which the processing output is finally reflected changes due to a change in the signal form such as the presence or absence of the horizontal and vertical resolution enhancement signals corresponding to the standard type and the simple type, respectively. I do. This change in display is particularly remarkable when one of the signals is a standard EDTV-2 signal for non-interlace scan display including both horizontal and vertical resolution enhancement signals, and the other is an NTSC signal for interlace scan display. The reason for this is that if these two signals switch,
This is because a change in the scanning line processing speed requires several seconds of processing time in the image receiving display unit at the end. This change in display is
The viewer gives a great sense of discomfort, and the shorter the interval between the changes, the more noticeable the discomfort.

[0011]

The conventional video signal processing apparatus described above performs processing in accordance with the presence or absence of an identification control signal and information on the identification control signal.
In the case where video signals of two different systems of DTV-2 are switched in a short period, or in the case of EDTV-2 signals, changes in signal form such as presence / absence of horizontal and vertical resolution enhancement signals corresponding to standard type and simple type, respectively. Therefore, when switching between these two types of signals, a change in the scanning line processing speed in the image receiving display unit at the end requires a processing time of several seconds, so that the processing output is finally reflected on the intensity of the change in the image receiving display unit. Had the disadvantage of giving a sense of discomfort to the elderly.

[0012]

A video signal processing apparatus according to the present invention has first and second aspect ratios and first and second scanning modes of a display image, at least one of which is for signal identification. Identification control signal detection means for detecting the identification signal from a video signal sequence in which the first and second video signals including the identification signal are mixed in a time sequence and outputting an identification control signal;
Processing selection means for selectively executing processing corresponding to each of the first and second aspect ratios and each of the first and second scanning modes in response to the supply of the identification control signal. A video signal processing apparatus for generating a display video signal for display, wherein the processing selection means is configured to reserve a broadcast program to be controlled in response to the supply of the identification control signal.
Continuity, which is a predetermined duration of the main system signal within the set controlled period, is detected by measuring the duration of the identification control signal, and a continuity signal is output to output the first and second images. One of the continuity correspondences of the signals is determined as the main signal and the other is determined as the non-main signal, and when the supplied video signal sequence is the non-main signal, the processing of the scanning mode corresponding to the main signal is selected. includes a continuity detecting processing switching means for outputting a processing switching signal to be executed, the continuity
A timer for outputting a timer signal for detecting the controlled
Time frame information means for outputting time frame information for setting a period;
It is provided with .

[0013]

FIG. 1 is a block diagram showing a first embodiment of the present invention, in which constituent elements common to those in FIG. The video signal processing apparatus according to the present embodiment includes an EDTV signal processing unit 1, a simple EDTV signal processing unit 2, an NTSC signal processing unit 3, an identification control signal detection unit 4, a signal switching unit 6, 8 and 10, the aspect conversion processing unit 7, and the sequential scanning processing unit 9, and switch in response to the supply of the control signal ST, the timer signal T, and the time frame information TF instead of the signal processing switching unit 5. It outputs signals S1, S2, S3 and detects continuity, which is the set duration of the main system signal, within a controlled period, which is a predetermined duration of the broadcast program to be controlled, and outputs these switching signals S1 to S3. Continuity detection switching unit that controls generation Comprising 1, a timer 12 for outputting a timer signal T for detection of the continuity, and the time frame information unit 13 to supply the time frame information TF for setting the controlled period.

Referring to FIG. 2 which shows the configuration of the continuity detection switching unit 11 by blocks, this continuity detection switching unit 11
Control signal state determination unit 11 for determining the state of control signal ST
2 and the switching signals S1 to S in response to the supply of the continuity signal CT.
3 and a signal switching determination unit 113 for performing a signal switching determination, and a supply of a state change signal SV output from the control signal state determination unit 112 in response to a change in the state of the control signal ST. And a timer counter unit 114 that initializes in response, starts counting the timer signal T, and outputs a continuity signal CT.

Next, the operation of this embodiment will be described with reference to FIGS. 1 and 2 and FIG. 3 which is an explanatory diagram showing an example of the state of a video signal within a certain time frame.
EDTV signal processing unit 1 for input video signal VI, simple EDT
V signal processing unit 2, NTSC signal processing unit 3, and supply to discrimination control signal detection unit 4, and in response thereto, signals a to c,
The operation until the output of ST is the same as the conventional one. In addition, the generation of the signals d to g corresponding to the signals a to c and the generation of the output signal VO in response to the switching signals S1 to S3 are the same as those in the related art. Therefore, description of these operations is omitted.

Next, the continuity detection switching unit 11 includes a control signal ST from the identification control signal detection unit 4, a timer signal T from the timer unit 12, and a time frame signal TF from the time frame information unit 13.
And outputs the switching signals S1 to S3 as a result of the processing described later.

The period defined by the time frame information section 13 is called a controlled period, and in the present embodiment, the controlled period is set to one hour for convenience of explanation.

Referring to FIG. 3, an opening title broadcast period 200 to a third main program broadcast period 21
One continuous hour up to 0 corresponds to the controlled period 214,
At the start of the controlled period 214, the timer counter unit 114 is initialized in response to the supply of the time frame signal TF, and simultaneously starts the counting operation.

In the controlled period 214, a signal whose continuation time is equal to or more than a predetermined time, that is, a signal whose continuity is recognized is set as a main signal in the controlled period 214. In the present embodiment, the continuity recognition time is set to 3 minutes.
In the process of detecting signal continuity, the control signal state determination unit 112 outputs a state change signal SV in response to a change in the state of the control signal ST, and initializes the timer counter unit 114 again.

Referring back to FIG. 3, this initialization operation is performed at the time when the first opening title broadcast period 200 changes to the first CM broadcast period 201, and thereafter, the timer counter 114 is changed every time the signal state changes. An initialization operation is performed. Further, the continuity of the same signal is detected at a point 212 after a continuity recognition period 211 of three minutes from the start of the first main program broadcast period 202. Regarding the processing content at the time of continuity detection, the timer counter 114 outputs a continuity detection signal CT and supplies it to the signal switching determination unit 113.

The signal form of the video signal at the continuity detection time point 212, that is, at the main program broadcast time 202 is ED.
The EDTV-2 signal is a main signal in a period 213 until the end of the controlled period 214 thereafter. In this period 213, the signal switching determination unit 113 applies the original EDTV-
EDTV of the main signal different from the original signal processing for the video signal of other signal form
It is determined to perform signal processing for outputting a sequentially scanned video signal similar to the -2 signal, and the switching control of the switching signals S1 to S3 is performed according to the determination result.

Next, referring again to FIG. 1 and FIG.
When the operation of the video signal processing apparatus in the above is further described, since the main signal is the EDTV-2 signal in this period 213, the first main program broadcast period 202, the third CM broadcast period 204, the second main program broadcast In the period 206 and the third main program broadcasting period 210, the original processing of the EDTV-2 signal is performed, and the output signal a of the EDTV signal processing unit 2 is selected by the signal switching unit 10 to be the output signal VO.

Next, it second, fourth, fifth, in the first 6CM broadcast period 203,205,207,20 8, the signal forms is a NTSC signal, the main signal is EDTV-2 signal Thus, the signal switching unit 6 selects the output signal c of the NTSC signal processing unit 3, the signal switching unit 8 selects the signal d, the signal switching unit 10 selects the output signal g of the sequential scanning processing unit 9, and the normal NTSC signal. A sequentially scanned image different from the image generated by the signal is received and displayed. With this, NT
This means that the SC signal is artificially converted into an EDTV-2 signal. Also, the seventh CM broadcast period 209 is a simple EDTV-2 signal including only the horizontal resolution enhancement signal,
The signal switching section 6 outputs the output signal b of the simple EDTV-2 signal processing section 2, the signal switching section 8 outputs the output signal e of the aspect conversion processing section 7, and the signal switching section 10 outputs the output signal g of the sequential scanning processing section 9. Respectively, and acts to perform a sequential scanning process which is not normally performed on the simplified EDTV-2 signal.

As described above, in the present embodiment, the NTS
The pseudo EDTV-2 signal processing is performed so that the signal processing for the simple EDTV-2 signal corresponding to only the C signal and a part of the resolution enhancement signal is simulated to the EDTV-2 signal corresponding to all the resolution enhancement signals which are the main signals. This is realized by a combination of respective signal processing units in the video signal processing device. Apart from this embodiment, the EDTV-2 signal can be artificially simplified to an NTSC signal and processed by similar processing.

Next, referring to FIG. 4, which shows a second embodiment of the present invention in which components common to those in FIG. This embodiment shows a video signal processing device incorporated in a recorder having a recording reservation function such as a VCR. The difference from the first embodiment is that the time for setting a time frame is different from that of the first embodiment. A recording reservation information section 14 is provided instead of the frame information section 13.

Time frame information section 1 in the first embodiment
Similarly to the function 3, the recording reservation information unit 14 has a function of setting a controlled period, which is a period during which the video signal processing is performed. The recording reservation information section 14 has recording reservation time information as information relating to a time frame generated at the time of recording reservation. By using the recording reservation time information as it is as a controlled period, there is no need to set a time frame again. .

[0027]

As described above, the video signal processing apparatus of the present invention detects the continuity of the main system signal in the controlled period based on the duration of the identification control signal, and determines one of the continuity measures. A continuity detection process switching means for judging a signal and the other as a non-main signal and selectively executing a process of the scanning mode corresponding to the main signal when the input video signal sequence is the non-main signal, By changing the video signal processing method for the non-main signal to conform to the signal processing method of the main signal, it is possible to reduce the sense of incongruity occurring in the process of processing the non-main signal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a video signal processing device of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a continuity detector of FIG. 1;

FIG. 3 is an explanatory diagram showing an example of a program content and a signal state of a video signal in a certain time frame.

FIG. 4 is a block diagram illustrating a video signal processing device according to a second embodiment of the present invention.

FIG. 5 is a block diagram illustrating an example of a conventional video signal processing device.

[Explanation of symbols]

 Reference Signs List 1 EDTV signal processing unit 2 Simple EDTV signal processing unit 3 NTSC signal processing unit 4 Identification control signal detection unit 5 Signal processing switching unit 6, 8, 10 Signal switching unit 7 Aspect conversion processing unit 9 Sequential scanning processing unit 11 Continuity detection Unit 12 timer unit 13 time frame information unit 14 recording reservation information unit 111 signal judgment unit 112 control signal state judgment unit 113 signal switching judgment unit 114 timer counter unit

Claims (4)

(57) [Claims] 1. First and second video signals each having first and second aspect ratios and first and second scanning modes of a display image, at least one of which includes an identification signal for signal identification. An identification control signal detecting means for detecting the identification signal from a video signal sequence mixed in a time sequence and outputting an identification control signal; and the first and the second responding to the supply of the identification control signal.
Processing signal selecting means for selectively executing processing corresponding to each of the second aspect ratio and each of the first and second scanning modes, and a video signal processing for generating a display video signal for display in the apparatus, the processing selection means, the identification control signal the identification controlling a predetermined duration of the main system signal continuity within the controlled period set in advance to a broadcast program of the control target in response to the supply of A continuity signal is detected by measuring the duration of the signal and a continuity signal is output, and one of the continuity correspondences of the first and second video signals is determined and supplied as the main signal and the other as the non-main signal, respectively. It said comprising a continuity detection processing switching means for outputting a processing switching signal to selectively perform the processing of the main signal corresponding scanning manner when the video signal sequence is the non-primary signal received, for the detection of the continuity of A timer for outputting a timer signal, and a time frame for outputting time frame information for setting the controlled period
A video signal processing apparatus according to claim Rukoto and an information unit. 2. A pre-Symbol continuity detection processing switching means, said first in response to a change of the identification control signal, the signal state determination unit that outputs a second judgment condition change signal to switch the video signal A signal switching determining unit that determines whether the video signal sequence is the main signal or the non-main signal in response to the supply of the continuity signal and outputs the corresponding processing switching signal And a timer counter unit that initializes in response to the supply of the state change signal, counts the timer signal, and generates the continuity signal as a result of counting the duration time. Video signal processing device. 3. A first video signal processing unit that processes the first video signal and outputs a first processed signal, and a second video signal that processes the second video signal and outputs a second processed signal A video signal processing unit, an aspect ratio conversion processing unit that converts the first aspect ratio of the first processing signal into a second aspect ratio and outputs a third processing signal, and the third processing signal A scanning mode conversion unit that converts the first scanning mode into the second scanning mode and outputs a fourth processing signal; and the first to fourth processing in response to the supply of the processing switching signal. The video signal processing device according to claim 1, further comprising: a switching unit that selects any one of the signals and outputs a processed video signal. Wherein said time frame information means, according to claim 1 for the recording apparatus, characterized in that it comprises a recording reservation timer for setting a recording reservation time consisting of recording start and end time
The video signal processing device according to the above.