JP3197809B2 - Television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly to a television receiver used for, for example, a so-called wide-screen TV, for displaying an image obtained from a video signal on a screen having an aspect ratio different from that of an input video signal. The present invention relates to a television receiver for displaying.

[0002]

2. Description of the Related Art Conventionally, in an image display device such as a television receiver, the aspect ratio of a screen is mainly 4: 3 in accordance with the standard such as NTSC. 2. Description of the Related Art In recent years, a television receiver having a horizontally long screen with an aspect ratio of 16: 9, which is called a wide TV, has been infiltrated to increase the sense of reality.

On the other hand, 4: 3 is still the mainstream for television broadcasting, and some broadcasts have a Vista size (aspect ratio, approximately 1: 1.8) with no image areas above and below the screen.
And a video signal called a cinema scope size (hereinafter simply referred to as “cinesco size”) (aspect ratio, approximately 1: 2.2).

Therefore, it is necessary to display a plurality of images having different aspect ratios even in a cathode ray tube (CRT) having a single aspect ratio.

There are the following display modes.

First, as shown in FIG. 5A, a normal mode in which an image is displayed with an aspect ratio of 4: 3.
As shown in FIG. 5B, a zoom mode in which an image is stretched to display a video source other than 4: 3, such as a Vista size or a Cinesco size, on a 16: 9 screen. As shown in FIG. Full mode that stretches the image only in the horizontal direction,
Furthermore, as shown in FIG. 5D, while maintaining the circularity of the center of the screen of the 4: 3 image, the image is expanded in the horizontal direction, and the 4: 3 image source is projected on a 16: 9 screen. There is a perfect wide mode and the like.

Conventionally, these display modes have been selected and switched by the user himself. Therefore, conventionally, the user has to switch the display mode each time according to the broadcast and the video source, and the operation is troublesome.

[0008] Therefore, in order to solve these problems, the present applicant has proposed a television receiver capable of automatically setting a desired display mode as proposed in Japanese Patent Application No. 6-178021. are doing.

An outline of an embodiment of the proposed invention will be described below.

Referring to FIG. 1, a television receiver 10 of this embodiment includes a selection switch 12. A television signal demodulated by a receiving circuit (not shown) is input from an input terminal 14 to a selection switch 12, and a composite video (composite video) signal from a video playback device (not shown) such as a video playback device is input to the selection switch 12. Is input from an input terminal 16, a luminance (Y) signal separated by luminance / color (Y / C separation) is input from an input terminal 18, and a color (C) signal separated by Y / C is input to an input terminal 20. Is entered from

The selection switch 12 selects an arbitrary signal from the input signals input by a control signal from a selection switching circuit (for example, the main CPU 30 in this embodiment) such as a channel selection CPU. , And output as a luminance signal and a color signal.

A composite video signal such as a television signal or a composite video signal input to the selection switch 12 is
The signal is applied to a Y / C separation circuit 22 and separated into a luminance signal and a color signal in order to match the output from the selection switch 12. The luminance signal and the color signal from the selection switch 12 are given to a video chroma processing circuit 24,
Synchronization separation is performed, a horizontal synchronization signal and a vertical synchronization signal are separated and output, and are converted into R, G, and B signals and output. R from the video chroma processing circuit 24,
The G and B signals are provided to a CRT drive circuit 26, and a CRT 28 is driven based on those signals.

The horizontal and vertical synchronizing signals from the video chroma processing circuit 24 are supplied to a main CPU 30. The main CPU 30 is also supplied with a clock and serial data from an image area detection circuit 42 (described later). Therefore, based on these signals, the main CPU 30 supplies a clock and control signal to the video chroma processing circuit 24 to switch the display mode such as the aspect ratio. Based on the clock and the control signal, the video chroma processing circuit 24 outputs a vertical deflection signal, a horizontal deflection signal, and an S-shaped correction signal. These control signals are supplied to the vertical oscillation circuit 34 and the horizontal oscillation circuit 36 of the deflection circuit 32. Outputs of the vertical oscillation circuit 34 and the horizontal oscillation circuit 36 are supplied to a vertical drive output circuit 38 and a horizontal drive output circuit 40, respectively, and the CRT 28 is controlled by the vertical drive output circuit 38 and the horizontal drive output circuit 40.
An image is displayed on the CRT 28.

The main CPU 30 has a ROM 30a.
The ROM 30a includes a table showing the relationship between the number of scanning lines and the vertical center data shown in FIG.
And a table showing the relationship between the number of scanning lines and the vertical size data shown in FIG. The table shown in FIG. 3 is used for vertical center correction, and the table shown in FIG. 4 is used for vertical size correction.

First, the vertical center correction processing will be described.

The vertical center of the image is calculated by:

Vertical center (number of scanning lines) = (image starting line + image ending line) / 2 Here, the image starting line indicates the number of the scanning line from which the image starts, and the image ending line Is
In terms of the scanning line, it indicates at what line the image ends.

The vertical center data (control signal) output to the video chroma processing circuit 24 is determined with reference to the result thus obtained and FIG. In the case of a video source of a cinesco size or a Vista size, the vertical center data is, for example, "18".

Next, the vertical size correction processing will be described.

The vertical size of the image is calculated by:

Vertical size (number of scanning lines) = image end line−image start line + 1 Referring to the result of this calculation and FIG. 4, vertical size data (control signal) output to video chroma processing circuit 24 is determined. Is done. The vertical size data is, for example, "46" for a Cinesco size video source, and "16" for a Vista size video source.

The image area detecting circuit 42 includes a luminance signal from the selection switch 12, a horizontal synchronizing signal and a vertical synchronizing signal from the video chroma processing circuit 24, and a main CPU.
A non-image area and an image area are detected based on setting data such as a black level threshold value from 40.

The image area detection circuit 42 is configured, for example, as shown in FIG. Image area detection circuit 4
2 includes input terminals 44, 46 and 48. A luminance signal from the selection switch 12 is input from an input terminal 44, a horizontal synchronization signal from the video chroma processing circuit 24 is input to an input terminal 46, and a vertical synchronization signal from the video chroma processing circuit 24 is input to an input terminal 48. A signal is input.

Then, the luminance signal input to the input terminal 44 is supplied to the LPF 50, and a noise component of the luminance signal is removed. The luminance signal processed by the LPF 50 is A
/ D conversion circuit 52.

The horizontal synchronizing signal from the input terminal 46 is applied to a clamp pulse generating circuit 54, which generates a clamp pulse based on the horizontal synchronizing signal. This clamp pulse is applied to the A / D conversion circuit 52. In the A / D conversion circuit 52, the luminance signal is pedestal clamped, and the luminance signal is converted into a 6-bit digital signal according to the white / black level. Then, the upper 5 bits of the digitally converted luminance signal are given to the CPU 56 for image area detection.
The image area detecting CPU 56 receives a horizontal synchronizing signal from the input terminal 46, a vertical synchronizing signal from the input terminal 48,
And setting data from the input terminal 58. Then, the image area detecting CPU 56 detects an image area based on the input data.

The output of the image area detecting CPU 56 is output from the output terminal 60 as serial data.
It is given to the main CPU 30. An A / D conversion clock and a data clock based on the vertical synchronization signal and the horizontal synchronization signal are output from the image area detection CPU 56, and the clocks are supplied to the main CPU 30 and the A / D conversion circuit 52, respectively. Can be Therefore, A / D
In the conversion circuit 52, A / D conversion is performed at the timing of this clock.
Conversion is performed. Note that the transmission and reception method between the image area detection circuit 42 and the main CPU 30 is not limited to the above-described method.

The reason that the upper 5 bits of the digital signal are used is that the lower 1 bit is affected by noise and the like.
This is because it is unstable. Moreover, ± 1 bit is processed as an error, and within the range, it is treated as the same data. Therefore, for example, when (00010X) is used as reference data, (00001X) and (00011X)
X) is determined to be the same as the reference data. here,
X is the sixth bit data, which may be "0" or "1". Note that the data from the A / D conversion circuit 42 need not be 5 bits, and the truncation of the least significant bit may be arbitrary. Also, the error need not necessarily be ± 1 bit.

Such an image area detection circuit 42 is more specifically configured as shown in FIG. Referring to FIG. 2, the luminance signal input from input terminal 44 is an LPF 5
DC cut by the capacitor 64 included in the
The bias is biased to a predetermined value by the resistance division by 6 and 68, and the impedance is converted by the transistor 70.
Then, only a low-frequency component of the luminance signal is extracted by the filter including the coil 72 and the capacitor 74, and the transistor 7
The impedance is converted at 6. LPF by these
50, and only the low-frequency component of the luminance signal is extracted. The LPF 50 is, for example, 200 to 300 so as to eliminate the influence of weak electric field noise and unnecessary pulse noise.
A pass band of about kHz is set.

The output of the LPF 50 is supplied to an IC (for example, manufactured by Sanyo Electric Co., Ltd.) constituting the A / D conversion circuit 52.
LC7480) is input to pin 6.

On the other hand, the horizontal synchronizing signal input to the input terminal 46 is an IC composed of one shot IC (for example,
Clamp pulse generation circuit 5 including SN74LS123)
4 and the clamp pulse is output from pin 5 and input to pin 12 of the A / D conversion circuit 52.

Here, the clamp pulse generation circuit 54
In synchronization with the horizontal synchronizing signal input to pin 2, a pulse is output from pin 13 and input again to pin 9. The pulse output from the 13th pin is set by a time constant circuit including a resistor 78 and a capacitor 80 connected to the 14th and 15th pins. Then, a pulse set by a time constant circuit including a resistor 82 and a capacitor 84 connected to pins 6 and 7 is output from pin 5 as a clamp pulse. This clamp pulse coincides with the position of the pedestal level in the video signal, and is used for clamping by the A / D conversion circuit 52 so that the level at that position is used as a reference level.

The video signal clamped by the clamp pulse is A / D-converted into a 6-bit digital luminance signal.
The signals are output in order from the higher order bits from the 13th to 18th terminals of the / D conversion circuit 52.

An A / D conversion timing clock is supplied from an oscillator (OSC) 86 connected to pins 27 and 28 as an oscillator of an image area detecting CPU 56 (for example, M34225 manufactured by Mitsubishi Electric Corporation). It is created by a program based on the clock, and is output from pin 12 of the CPU 56 for image area detection. Then, the timing clock is input as a clock to pin 20 of the A / D conversion circuit 52. This clock is a timing pulse for taking in data.

In the 6-bit digital luminance signal, the upper 5 bits correspond to the 11th pin, 1 pin of the CPU 56 for image area detection.
The data is sequentially input to the 0th, 9th, 8th, and 6th pins from the upper bit.

The image area detecting CPU 56 performs an image area detecting process, which will be described later, and outputs a clock from pin 24 and serial data from pin 25 to the main CPU 3.
0 is transferred. The setting data (serial data) from the main CPU 30 is input to pin 26.

In the main CPU 30, the aspect ratio of the video source is determined based on the data, and the control signal and the clock are converted to the video chroma processing circuit 2.
4 given. The video chroma processing circuit 24 outputs a vertical deflection signal, a horizontal deflection signal, and an S-shaped correction signal based on the input signal, and controls the deflection circuit 32. Therefore, the deflection circuit 32 performs a process according to the control signals.

Next, the operation of the television receiver 10 thus configured will be described.

First, the television signal or the composite video signal input from the input terminal 14 or 16 is input to the Y / C separation circuit 2 via the selection switch 12.
2 and separated into a luminance signal and a color signal.
Then, the luminance signal and the color signal are input to the selection switch 12 again, and one of the signal and the luminance signal or the color signal input from the S terminals (input terminals 18 and 20) is selected and output. Is done.

The luminance signal from the selection switch 12 is
The digital image signal is taken into the image area detection circuit 42, A / D converted at the timing of the horizontal synchronization signal and the vertical synchronization signal, and the image area is detected by the digital video signal.

The result is input to the main CPU 30 as serial data. In the main CPU 30, the aspect ratio is determined, and a control signal corresponding to the aspect ratio is supplied to the video chroma processing circuit 24. Here, the horizontal deflection signal is a control signal for adjusting horizontal deflection, the vertical deflection signal is a control signal for adjusting vertical deflection, and the S-shaped correction signal is a control signal for adjusting S-shaped correction of deflection. As described above, a desired display mode is automatically obtained by the video source.

As described above, the wide-screen television having the aspect ratio of 16: 9 has the above-described automatic screen size switching function.

In recent years, with the widespread use of video tape recorders (hereinafter, referred to as VTRs), there have been more opportunities to watch reproduced videos on VTRs. conventionally,
The television receiver and the VTR were purchased separately by the user, and the VTR and the television receiver were connected separately. In recent years, however, the television receiver and the VTR have been integrated into one in order to eliminate the trouble. Thus, there has been proposed a VTR-integrated television receiver as a completed product already connected.

Therefore, also in the above-mentioned wide television receiver, by integrating the VTR, the television signal and the television signal from the VTR can be reproduced by the wide television receiver more comfortably for the user. It is a matter of course.

Further, the above-mentioned wide television receiver has a function of automatically switching the screen size in response to a television signal reproduced by the television receiver. Because the size can be switched, you can see in a comfortable state.

However, on the other hand, there are cases where a VTR reproduces an image in a signal form not included in a broadcast signal. It is considered that the special reproduction such as the fast forward reproduction and the rewind reproduction performed by the VTR corresponds to such a signal form.

In the case of such special reproduction, such as fast forward reproduction or rewind reproduction, noise bars appear at random positions in reproduced video. As a result, in the case of such an image, the automatic screen size switching function described above malfunctions. That is, as described above, in switching the screen size, first, in order to check the state of the video, a non-image portion or a portion of the video is determined, and the switching operation is performed based on the determination result.

Therefore, in the case of the special reproduction from the VTR as described above, since a stable video cannot be obtained, the state of the video cannot be accurately grasped. Therefore, in the special playback fold, a mode in which the screen size is not automatically switched is selected to perform the special playback. Thereafter, when performing normal reproduction or receiving a television broadcast, an operation of setting the automatic screen size mode must be performed.

[0048]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and is intended for fast-forward playback from a VTR when a wide-screen television is in a mode in which a screen size is automatically switched according to video. When reproducing a special reproduction signal such as rewind reproduction or the like with a television receiver, the television receiver detects the special reproduction signal and does not switch the screen size.

[0049]

SUMMARY OF THE INVENTION The present invention provides a video signal detecting means for detecting a video signal, an image area detecting means for detecting an image area based on an output of the video signal detecting means, and an output of the image area detecting means. A video tape recorder provided with a display adjustment means for adjusting a display mode composed of a standard image displayed on a screen and an image having a plurality of types of patterns which are wider than the standard image in accordance with the video tape recorder. Composite video signal input means for inputting a reproduced video signal from the microcomputer, special reproduction detecting means for detecting that the reproduced video signal from the composite video input means is a special reproduction video signal, and the special reproduction detecting means And control means for controlling the operation of the display adjustment means to stop based on the output from the television. It is a tio down receiver.

Further, the present invention is the television receiver, wherein the special reproduction video signal from the video tape recorder is a fast forward reproduction or a rewind reproduction.

Further, the present invention provides the video tape
The recorder is also a television receiver integrated with the television receiver.

Further, according to the present invention, the control means includes an operation section for operating the video tape recorder, and after receiving a command signal from the operation section by a television receiver, The present invention is also a television receiver which gives a command to a tape recorder and controls so as to stop the operation of the display adjusting means.

[0053]

Embodiments of the present invention will be described below with reference to the drawings. A block diagram of the embodiment is shown in FIG. 11, but the same reference numerals are the same as those shown in FIG. 1, so that the description of the basic operation is omitted and the present invention is added. The function that has been performed will be described.

In FIG. 11, the configuration different from FIG.
The main CPU 30 gives an operation command such as reproduction to the VTR 1 based on the point that the composite signal from the TR 1 is input to the selection switch 12 and the control signal from the operation unit 3 that can operate the television receiver. And the television signal is input from the tuner 2 to the selection switch 12.

First, an operation command from the operation unit 3 is sent to the main C
When the PU 30 determines and issues a command to the VTR 1, the VTR
Give command to 1. Here, if the command of the VTR 1 is a special playback such as fast forward playback or rewind playback, the main CPU 30 gives the command of the special playback operation to the VTR 1 and further does not perform the automatic screen size switching.
The deflection circuit 32 is controlled. Then, when the special reproduction is canceled, a command is given to each circuit to perform automatic screen size switching again.

Next, the automatic size switching operation will be briefly described. First, the discrimination of the identification control signal of the television signal of the EDTV2 is performed by converting the luminance signal input to the input terminal 44 into a digital signal by the A / D conversion circuit 52 via the LPF 50, and synchronizing a signal slice, a video slice, The signal is sliced into four types of signals, ie, two EDTV slices and a subtitle slice, and is provided to the image area detecting CPU 56.

Then, the CPU 56 for detecting the image area detects from the input signal, what line of the scanning line from what line of the scanning line, and whether it is the EDTV2 signal. The image area detecting CPU 56 transmits the above detection result to the main CPU 30.

The vertical blanking position is transmitted from the main CPU 30 to the CPU 56 for image area detection. This is because, when the screen is stretched in the vertical direction, if the screen is not blanked at the top and bottom of the screen, the beam current hits the neck of the CRT, causing reflection within the tube screen and causing the top or bottom of the screen to shine. If this lasts for a long time, C
The reliability of the RT may be impaired.

Main CPU 30 and CPU for detecting image area
The transmission and reception of information between 56 is performed by three-wire serial transmission and reception using three wires. The main CPU 30 transmits a control signal such as a vertical amplitude amount and a vertical center amount to the deflection circuit 32 based on the received data.

The deflection circuit 32 includes a vertical oscillation circuit 34, a vertical drive circuit 38, a horizontal oscillation circuit 36, and a horizontal drive circuit 40, and drives the CRT 28.

The main CPU 30 performs a total of three processes, namely, a process of determining the EDTV 2, a process of determining the start line and the stop line of the video, and a process of determining the control signal from the determination result. The main CPU 30 issues an instruction to switch the screen size to the next step.

Based on the above-described configuration, a series of automatic screen size switching operations will be described with reference to the flowcharts of FIGS.

First, in FIG. 7, when a video signal is being input from the VTR 1, the processing is terminated while the VTR is performing fast-forward playback or rewind playback (step S).
20, step S21). This is because, in the case of a VTR-integrated television receiver, a video signal is disturbed in fast-forward playback or rewind playback, so that a screen size switching operation is prohibited.

Next, if both steps S20 and S21 are "NO", the process proceeds to step S22. This step S22 is a step of judging a change in EDTV2, and performs a process of judging EDTV2. This flowchart operates as shown in FIG.

That is, in step S1, EDTV2
(Hereinafter, EDTV2 is referred to as EDTV) is determined (detecting the identification control signal to determine whether or not EDTV2 is received). If it is EDTV, the process proceeds to step S8, and the EDTV is not detected. In this case, the process proceeds to step S2. In step S2, when it is determined that there is no EDTV, there is no change.
The V counter is cleared and the process ends.

The EDTV counter is used to determine that the value is valid when the value of the predetermined time is determined. In step S3, since the latest information of the EDTV is different from the determined one,
The DTV counter is incremented (+1). If the increment result is equal to or greater than the number of times of no EDTV (step S4), it is determined that there is no EDTV, and
Set the value without V. (Step S5) Step S6
Then, since there is a change, the EDTV switching flag is set, and the process ends.

On the other hand, in step S8, when the image is 4: 3,
It is determined whether an option for not performing the EDTV determination process is set. This is a measure against a video source that is not an EDTV video but is determined to be an EDTV.

If there is no option, step S10
Proceed to. If there is an option, it is determined whether or not there is a non-image portion at the upper part of the screen (step S9). If there is a non-image portion, the process proceeds to step S10. If there is no image,
It is determined that the image is 4: 3 video, and the process ends.

In step S10, when it is determined that the EDTV is present, there is no change. Therefore, the process proceeds to step S16, where the EDTV counter is cleared, and the process is terminated. In step S11, since the latest information of the EDTV is different from the final information, the EDTV counter is incremented (+1).
I do. When the increment result is EDTV and the number of determinations is equal to or greater than a predetermined number (step S1)
2) The presence of EDTV is determined, and the value of EDTV is set. (Step S13) Then, in step S14, since there is a change, the EDTV switching flag is set, and the process ends.

Thus, the presence or absence of EDTV is determined by the above processing. It should be noted that the number of times the EDTV is determined and the number of times the EDTV is not determined need not be the same, and a range in which erroneous determination is not required may be set. In addition, the EDTV2 determination process is performed about every 160 msec, but it is needless to say that the present invention is not limited to this.

Therefore, the ED shown in FIG.
After performing the TV2 determination processing (step S22), subsequently, in step S23, it is determined whether or not there is an image in the center. This is a process for preventing the screen from being switched when the screen becomes completely black. If there is an image in the center, the process proceeds to step S24, and if not, the process proceeds to process C in step S52.

In step S24, the received video data is regarded as valid and stored as the latest video data. In step S25, it is determined whether the latest data is within the error range of the buffer data. Here, the buffer data is
This is candidate data that may be determined data, and is data stored in a buffer. The buffer data includes a video start line and a stop line, and is hereinafter referred to as a start buffer and a stop buffer.

That is, the latest start line and the latest stop buffer are compared, and the latest stop line and the latest stop buffer are compared. The determination here has an error of ±, and processing is performed so that the data can be determined to match even if they do not completely match. Hereinafter, the same applies. In this embodiment, the error range is ± 1 bit, but it goes without saying that the present invention is not limited to this.

Next, if "YES" is determined in the step S25, the process proceeds to a process B in a step S77.
It is a flowchart as shown in FIG. That is, the NG counter is cleared. (Step S26).
The NG counter will be described later.

Then, in step S27, if the number of coincidence counters is less than a predetermined number, the process proceeds to step S28, and if not, the process proceeds to step S52. A step S28 increments the coincidence counter.

In step S29, if the coincidence counter is equal to or more than a predetermined number, the process proceeds to step S31; otherwise, the process proceeds to step S30. In step S30, it is determined whether it is a caption determination time. If it is the caption determination time, the process proceeds to step S31; otherwise, the process proceeds to step S52.

If the determined data is 4: 3 in step S31, no subtitle determination is performed, and the process proceeds to step S35.

If the final data is not 4: 3, the flow shifts to step S32 to determine subtitles. The determined start and the start buffer are within the error range (step S32 = “
YES "), and when the stop buffer has decreased from the determined buffer beyond the range of the error (step S33 =").
YES ”), it is determined that there has been a change from with or without subtitles, and the flow proceeds to step S40.

In step S40, if it is already determined that there is a subtitle, the process proceeds to step S52. If it is not determined that there is a subtitle, that is, if there is a change from no subtitle to present, the process proceeds to step S41 and the subtitle flag is set. Is set.

In step S34, it is determined whether the stop buffer is within the error range from the determined stop. If the change exceeds the error, it is determined that the change has been made from no caption to yes, and the process proceeds to step S39. In step S39, a subtitle flag is set, and the routine goes to step S37.

Next, if "NO" in S34, it means that both start and stop are within the error range, so that the flow shifts to S52. In step S35, it is determined again whether or not it is the caption determination time. This is because at the time of the caption determination time, only the caption determination is performed, and the normal screen size switching is not performed.

If "YES" is determined in the step S35, that is, if it is the caption determination time, the process shifts to the step S52. If "NO" in the step S35, the screen size is switched because it is not the subtitle determination time. First, the subtitle flag is cleared in step S36.

Then, in step S37, buffer data is stored in the determined data. In other words, a start buffer is stored for a fixed start, and a stop buffer is stored for a fixed stop. In step S38, a screen size switching flag is set.

On the other hand, if "NO" in the step S25, the process proceeds to a process A in a step S76 in FIG. Then, since the latest data exceeds the error range of the buffer data, the process shifts to step S42 to store the latest data in the buffer data.

Since a data mismatch has occurred, the match counter is cleared (step S43). Step 44
Now, it is determined that the current screen is 4: 3 and whether the screen is switched is determined. If “YES”, the process moves to step S52. If “NO”, the process moves to step S45.

In steps S45 to S51,
It is determined whether the buffer data is outside the currently determined data, that is, in a direction in which the buffer data increases. If this continues more than the set number of times, it is determined that the image is unstable, and the image is forcibly 4: 3.
The processing for setting the data is performed.

That is, in step S45, if the start buffer is smaller than the fixed start, step S47
Otherwise, to step S46. In step S46, if the stop buffer is larger than the fixed start, the process proceeds to step S47; otherwise, the process proceeds to step S52.

In step S47, the NG counter is incremented. In step S48, if the NG counter has exceeded the set number of times, it is determined that the image is unstable, and the flow proceeds to step S49. Otherwise, step S52
Move to

The NG counter is cleared (step S4)
9) Data for performing 4: 3 screen setting is stored in a fixed start and a fixed stop (step S50). Further, a screen size switching flag is set (step S5).
1) The process proceeds to step S52.

Processing for determining a control signal from the determination result is as follows.
This will be described with reference to FIG. That is, in step 52, after the series of processes described above, it is determined in step S60 whether the EDTV switching flag is set. If "NO", EDT
Since there is no change of the V signal, that is, there is no change such as the presence or absence of the EDTV signal or the absence of the EDTV signal, the process proceeds to step S75.

If "YES" in the step S60, ED
Since there is a change in the TV signal, step S
The process proceeds to 61, where the EDTV switching flag is cleared. In step S62, it is determined whether or not there is an EDTV.
If there is a V, the screen size is set to the "zoom" mode. (Step S68) This "zoom" is a fixed screen mode suitable for displaying a 16: 9 image. In step S69, a process of reading a vertical size amount that can be freely set by the user is performed. Since each screen size has a vertical size adjustment value, the present invention is not limited to such processing.

In step S70, data such as the vertical size and vertical center for EDTV are set. The data has the same value as the screen size = “zoom” mode.

On the other hand, if it is determined in step S62 that there is no EDTV, the flow shifts to step S63. Here, it is determined whether or not the automatic wide on is set. If the auto-wide mode is ON, the process proceeds to step S64, and the total number of scanning lines of the image is calculated from the current fixed start and fixed stop. In step S65, the total number of scanning lines of the video is set to a set value (for example, 160
In the following cases, an auto-wide operation is performed (step S).
66). Here, the auto-wide operation is an operation of adjusting a vertical size, a vertical center, and the like so that an image is displayed on the entire screen without loss, and is an existing technology.

In the step S71, it is determined whether or not the camera is in the auto wide-on mode. If the auto-wide mode is off, the process is terminated (step S75). When the auto wide is on, step S
The flow shifts to 72, and if the screen size switching flag is set, the flow shifts to step S73, where the screen size switching flag is cleared (step S73) and the auto-wide operation is performed (step S74).

If the screen size switching flag has not been set in step S72, the process ends (step S72).
75).

In this way, as shown in FIG.
When the EDTV2 signal is received, first, as shown in FIG. 11B, the mode is switched to a so-called zoom mode. In this case, the start line and the stop line of the video are not determined, and the determination is made only based on whether or not the signal is the EDTV2 signal.

Next, the start line and the stop line of the video are determined, and as a result, the total number of scanning lines of the video (that is,
When the (stop line-start line) is less than a certain value, for example, when the total number is 160 or less, an auto-wide operation is further performed.

In the case of FIG. 11A, since the total number of scanning lines exceeds 160, the zoom mode remains.
In the case of FIG. 11B, since the total number of scanning lines is 160 or less, the auto wide is operated. FIG. 11C shows EDT.
In the operation when the signal is not the V2 signal, the mode shifts to the auto mode without shifting to the zoom mode.

[0099]

As described above, according to the present invention, in the VTR integrated wide television receiver, when the reproduction video from the VTR is in the special reproduction, the automatic switching of the screen size is stopped and the special reproduction is completed. Sometimes, the automatic screen switching mode is reentered, so that the operator does not need to stop or start the automatic screen size mode.

[Brief description of the drawings]

FIG. 1A is a block diagram showing a conventional wide television receiver, and FIG. 1B is a block diagram showing an example of an image area detection circuit.

FIG. 2 is a circuit diagram illustrating an example of an image area detection circuit.

FIG. 3 is a graph showing a relationship between the number of scanning lines for performing vertical center correction and vertical center data.

FIG. 4 is a graph showing a relationship between the number of scanning lines for performing vertical size correction and vertical size data.

FIG. 5 is an illustrative view for explaining various display modes;

FIG. 6 is a flowchart of the EDTV2 signal determination process of the present invention.

FIG. 7 is a flowchart showing the operation of the automatic screen size according to the present invention.

FIG. 8 is a flowchart illustrating the operation of the automatic screen size according to the present invention.

FIG. 9 is a flowchart illustrating the operation of the automatic screen size according to the present invention.

FIG. 10 is a flowchart showing the operation of the automatic screen size of the present invention.

FIG. 11 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Video tape recorder 1 ... Tuner 1 ... Operation part 12 ... Selection switch 22 ... Y / C separation circuit 24 ... Video chroma processing circuit 26 ... Driver circuit 28 ... CRT 30 ... Main CPU 32 ... Deflection circuit 42 ... Image area Detection circuit

Claims (4)

(57) [Claims] 1. A video signal detecting means for detecting a video signal,
An image area detecting means for detecting an image area based on an output of the video signal detecting means, a standard image displayed on a screen according to an output of the image area detecting means, and a plurality of types of images which are wider than the standard image. In a television receiver having a display adjustment means for adjusting a display mode consisting of an image having a pattern, a composite video signal input means for inputting a reproduced video signal from a video tape recorder, and the composite video input means Special playback detection means for detecting that the playback video signal is a special playback video signal, and control means for controlling to stop the operation of the display adjustment means based on an output from the special playback detection means. A television receiver characterized in that: 2. The television receiver according to claim 1, wherein the special reproduction video signal from the video tape recorder is a fast-forward reproduction or a rewind reproduction. . 3. The television receiver according to claim 2, wherein the video tape recorder is formed integrally with the television receiver. 4. The television receiver according to claim 3, wherein said control means includes an operation unit for operating said video tape recorder, and a command signal from said operation unit is transmitted to said television receiver by said television receiver. After receiving the instruction, a command is given to the video tape recorder and the operation of the display adjusting means is controlled to be stopped.