JPH04103271A - Control method for high vision receiver - Google Patents

Abstract

PURPOSE:To relieve the load of a picture memory provided to an image sender at a sender side by utilizing the picture memory built in a receiver for processing a High Vision reception signal so as to provide a special effect. CONSTITUTION:An input picture signal and a picture signal reproduced from a memory 5 are changed over under the selection control by using a control signal to be sent together with a picture signal sampling value in the case of controlling decoding display using the memory 5 for a High Vision picture in a High Vision receiver receiving a High Vision picture signal subject to band compression transmission by the intermittent transmission of the picture signal sample value. Then the High Vision picture added with the special effect including any of wipe, simple dissolve, cut-change and character superimposition is decoded and displayed. Since the picture memory 5 built in the receiver is utilized for the special effect added selectively at any time, the load of the picture memory provided to the image transmitter is relieved.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a high-definition receiver that receives a high-definition image signal that has been band-compressed and transmitted by intermittent transmission of image signal sample values, and restores and displays the high-definition image using a memory. Regarding the control method, in particular, the image display function is expanded by making more effective use of the memory essential for restoring and displaying high-definition images.

(Summary of the Invention) The present invention restores a high-definition original image by receiving a high-definition image signal transmitted with band compression by intermittently transmitting sample values of a wideband image signal subjected to subsampling, such as a MUSE signal. When displaying, the receiver's built-in memory, which is essential for restoration signal processing such as subsample phase interpolation and interframe interpolation, is used more effectively, and tape playback is performed along with the original control signals of the MUSE method, which are transmitted together with image signal samples. A dropout compensation (DOC) signal that repairs a signal dropout by regenerating the corresponding signal frozen in the built-in memory immediately before the dropout and a similar signal forced switching control signal are configured in the required format. By appropriately switching between the momentary input image signal and the image signal reproduced from the built-in memory under the control of the control signal, special effects such as wipe, simple dissolve, cut change, and character superimposition can be created. This system enables image display with added images to be performed easily and optionally by signal processing on the receiving side, without using memory on the transmitting side, and provides a new image display function to high-definition receivers. be.

(Prior art) In general, special effects such as partial switching of displayed images are
Conventionally, the image sending device on the transmitting side is equipped with a circuit device necessary for producing images with special effects, such as a still image file device, and the image signal is processed exclusively on the transmitting side for the signal processing necessary for the special effects. Even with high-definition receivers, the receiving side merely receives and displays such built-in special effect images, and the receiving side can optionally add special effects to the displayed image. There are no known examples of adding .

For example, the above-mentioned still image file device is equipped with a plurality of frame memories that are equivalent to or greater than those built into a high-definition receiver, and are equipped with an image signal reproduced from a recording medium serving as a signal source and an image signal stored in the memory. An image signal with a special effect such as a wipe is created by appropriately switching between the two, and the built-in special effect image signal is transmitted, and the receiver simply receives and displays the wipe image.

(Problem to be solved by the invention) However, although the still image file device serving as the transmitting side image transmission device is equipped with a large number of frame memories, these frame memories are constantly used for the original program production itself. Therefore, it was not easy to add special effects, especially to add optional effects. On the other hand, high-definition receivers either have a built-in frame memory as an essential device to restore the original image signal by performing subsample phase interpolation or interframe interpolation on the intermittent transmitted image signal samples, or Since all memory addresses are not always fully used for signal processing such as restoring the original image, there is room to use them for other relatively simple signal processing. Therefore, when it comes to adding special effects to images displayed on high-definition receivers, especially when it comes to optional additions, there is an imbalance in the required frame memory burdens on the transmitting and receiving sides. There was room for further expansion of display functions.

(Means for Solving the Problems) It is an object of the present invention to solve the above-mentioned conventional problems, to more effectively utilize the image memory built into a high-definition receiver, and to at least add information to images to be received and displayed. Regarding optionally added special effects, a method for controlling a high-definition television receiver reduces the burden on the image memory provided in an image sending device such as a still image file device, and provides a new image display function. Our goal is to provide the following.

That is, the method for opening the high-definition receiver of the present invention controls the restored display using the memory of the high-definition image in the high-definition receiver that receives the high-definition image signal that has been band-compressed and transmitted by at least intermittent transmission of image signal sample values. In doing so, at least one of wipe, simple dissolve, cut change, and character superimposition is performed by switching between the input image signal and the image signal reproduced from the memory after selective control using a control signal transmitted together with the image signal sample value. This system is characterized in that a high-definition image can be restored and displayed by adding special effects including:

(Function) Therefore, according to the high-definition receiver control method of the present invention, it is possible to utilize the built-in image memory of the receiver for special effects that are optionally added to the display image of the high-definition receiver. , it is possible to reduce the burden on the image memory provided in an image sending device such as a still image file device.

In addition, since it becomes possible to optionally add special effects to the displayed image on each receiver without bothering the image transmitting device, it is possible to not only reduce the burden on the image transmitting device, but also to A new image display function will be provided to the television receiver, and a new form of high-definition program production itself will be developed.

(Example) The present invention will be described in detail below with reference to the drawings.

First, FIG. 1 shows an example of the configuration of the main parts of a high-definition receiver that is controlled by the method of the present invention and is capable of adding special effects to displayed images. In FIG. 1, portions added or modified according to the present invention to the configuration of a conventional high-definition receiver are shown surrounded by dotted lines.

That is, in the configuration example shown in the first diagram, changeover switches Sl+S2 and S4 are newly provided in the conventional high-definition receiver, and switches S3 and
The switching of various signals and the operation mode control of each part circuit are performed by the control method of the present invention,
This allows special effects to be added to the displayed image.

Therefore, the main parts of the illustrated high-definition receiver are the MUS
This is an E-scheme digital interface unit. Conventionally, MtJSE broadcast microwaves from a broadcasting satellite are converted to an IF intermediate frequency (IF) by an outdoor unit (ODLI) via a receiving antenna, and guided to the tuner unit 1. The MUSE transmission signal is extracted and digitized by the A/D converter 2, the frequency characteristics of the signal level are adjusted via the equalizer (EQ) 3 and the de-emphasis circuit 4, and then the signal is sent to the frame memory 5 and the internal memory via the switch S3. Insert TC [
The video signal is supplied to the decoding circuit 6 and the sub-sampled values are intermittently transmitted, and the video signal is restored to its original form, and the analog video signal is taken out via the matrix circuit 7 and the D/A converter 8. Further, the digital MIJSE signal from the A/D converter 2 is guided to the synchronization generator 9, the synchronization signal is taken out, and the tuner section 1
The audio time expansion circuit l
audio decoder 11 and D to restore the time axis.
The analog audio signal is taken out via the /A converter 12.

In the high-definition receiver according to the present invention, the conventionally configured interface section includes a changeover switch s1. s
2 and S, and as mentioned above, the MUSE digital signal consisting of an 8-bit video signal and audio signal corresponding to the de-emphasis output in a normal high-definition receiver is inputted from another signal generation source as a clock signal and It is supplied together with the above-mentioned special effect addition control signal, so that it can be switched with the regular received input high-definition signal from the A/D converter 2 and supplied to the equalizer 3, synchronization generator 9, and audio decoder 11, Switch S4 is switched so that an external digital audio signal can be supplied directly to D/A converter 12.

In addition, switching of the switch S3 can be controlled by the above-mentioned special effect addition control signal, so that the frame memory 5 can be adapted to signal processing for adding special effects to the input video signal system, and the special effects can also be added. Other control signals for addition can be introduced into the receiving output analog video signal transmission system via the matrix circuit 8.

With the above-described configuration, the types of video and audio signals to be supplied to the high-definition receiver of the present invention to add special effects, and the control signals that control the newly provided changeover switch S++82 and the operation mode of each circuit. Table 1 shows the signal contents divided into input and output of the decoder.

Table 1 Types and contents of signals in the present invention Among the various signals shown in Table 1, audio signals are
It is supplied in the form of a pit stream of 350 kbit/s. Also, Dropout Convenience (
The DOC) signal stops receiving new input signals in the frame memory 5 and freezes the memory state, and when control bit #3 (described later) is "0",
During the period of this signal, the low frequency switching is stopped, and the forced interrupt signal causes the digital data signal to interrupt the digitized video signal regardless of other conditions. More preferably, when the activate signal is at a low logic level, it stops accepting new input signals in the first illustrated configuration.

Next, in the interface section having the configuration shown in the first diagram, the control functions of each control bit #0 to #7 will be explained in detail in the case where the side image signal for adding special effects inputted from the outside together with the MUSE digital signal has an 8-bit configuration. Fig. 2 briefly summarizes the assumed example and shows that each control bit #0 to #7 is set to “0”.
Table 2 sequentially shows the names of the division signals and the circuit operations of each section in the high-definition receiver decoder section when the signal is in the state of "1" and "1".

Table 2: Operation of the receiver depending on the name and status of the control signal.1.
Figure 2 shows the various divisions necessary for applying various special effects in the MUSE receiver decoder, which are sequentially shown in the frame in relation to the various control signals of the 32-bit configuration original to the MUSE method that are incorporated into the MUSE signal and transmitted. For each item, the controlled operation or controlled information of the receiver obtained when the illustrated control bits are set to "0" and "l" are shown in sequence on the right side outside the frame.

In addition, among the circuit operations of the high-definition receiver decoder section shown in the right column of Table 2, the circuit operations when the control bit is #0 or "l" are based on the 16.2 MHz control clock introduced from the outside. For the signal
Except for the free run state of control bit #4-“1”, phase-locked loop (PLL) control is applied, horizontal drive (HD) signal, frame pulse (FP
) signals are all similarly extracted from externally introduced digital data.

Furthermore, when control bit #5 is set to "1'," the video decoder converts the image signal of the field on the side different from the field displayed in normal operation in the interfield interpolation memory into still system and motion system. Image display is performed in motion mode by setting the mixing ratio of pixel signals to a "drive" state where only motion is involved.In other words, the subsample phase of intra-field interpolation during image display is set to the input image signal or control bit #. The sub-sample phase is opposite to the original phase indicated by 7.

On the other hand, if control bit #6 is set to "B", the video decoder will change the mixing ratio of still and motion pixel signals to the image signal of the field displayed in normal operation in the interfield interpolation memory. “Complete silence” with only systems
image display in static mode. That is, for both the luminance (Y) signal and the chromaticity (C) signal, the subsample phase of interframe interpolation is determined by control bit #7, and the subsample phase of interfield interpolation is determined by the frame pulse included. “0” in the field
”, and the noise reduction in the video decoder, that is, the circuit operation for noise reduction, is set to OFF.

Note that the MUSE signal has a time chart as shown in Figure 3, in which the phase of the intermittent transmitted sub-sample (SS) signal completes the sample value transmission of all phases by completing one cycle in four fields. If sample value transmission is performed in a field sequence, control bit #7, when set to 0, indicates a foot field containing a frame pulse in which all subsample phases are 0 in the 4-field sequence. "l" indicates any of the other three fields.

In the control method of the present invention, the decoder section of the high-definition receiver is controlled by the control signal as described above, and various types of signals are controlled by appropriately switching between the received input signal and the playback signal from the built-in memory or the additional signal supplied from the outside. Special effects are added to the displayed image, but instead of showing a specific example of the configuration of the equipment that supplies signals to the receiver for adding special effects, we will not specifically explain the aspect of the high-definition receiver divider according to the method of the present invention. Explain.

First, as shown in Figure 1, an example of a schematic configuration of a device that supplies externally supplied video/audio time-division multiplexed, for example, 10-bit MUSE digital input to the interface section of a high-definition receiver is shown in Figure 4. As shown in the figure.

In the external signal supply device having the schematic configuration shown in FIG.
A high-definition signal such as character information used for special effects such as character superimposition, which is equivalent to the MUSE transmission signal, is extracted from 3, and is connected to a time base control (TBC) circuit 10 and an equalizer (EQ).
3. A clock (ck) signal for video signal processing along with the video and audio signals via the de-emphasis circuit 4 etc.
For example, an 8-bit special effect addition control signal consisting of an audio signal processing clock (sound ck) signal, a drop out compensation (DOC) signal, etc. is output. These externally supplied signals are basically the same as analog input signals and attached control signals of a conventionally used normal high-definition receiver, and are converted into normal received input signals by the switch SW1 in the interface section shown in the first figure. It is possible to easily control the display by switching between the two, and apply desired special effects, such as character superimposition, to the displayed image.

Note that the control signal supplied from the outside is 10 (1000
0X or 10100OOX, and in the case of an 8-bit configured MUSE digital input, it will be 1100OOOX or 1110000X, and when configured as an 8-bit digital equivalent to the non-linear de-emphasis output that receives a regular high-definition signal with non-linear pre-emphasis. is 0100OOOX or 0
It becomes 110000X. Although the control signals having such a configuration are not examples for adding special effects to the displayed image, they demonstrate the usefulness of the control signals used in the method of the present invention, and the DOC signals included in each digital configuration can be used to control the input image. By switching between the signal and the memory reproduction image signal, special effects such as so-called freeze or wiping of a still image can be added to the displayed image.

Next, a still image signal generator that generates a still image signal used for adding special effects such as the above-mentioned wipe, that is,
FIG. 5 shows an example of the configuration of a still image file device. In the still image file device having the illustrated configuration, a high-definition still image signal such as a MUSE signal from a signal source 14 such as the video disc player (VDP) or video cassette recorder (VCR) described above is controlled by a timing control circuit 17. Later, the video signal is led to a required number of frame memories 15 to be stored, and if necessary, the video signal of the desired frame is transferred to the MLISB synchronous generation under the control of the same timing control circuit 17. The MUSE synchronization signal from the circuit 16 is time-division multiplexed and reproduced, for example, as an 8-bit video signal, and the audio signal via the audio time expansion circuit 18 and the video from the timing control circuit 17 are reproduced at 16.2 MHz.
, audio, 1350 KHz clock signals and other timing control signals are supplied to the interface section of the high-definition receiver.

Note that, without time-division multiplexing the MUSE synchronization signal from the MLISE synchronization generator 16 onto the video signal, control bit #4 in the 8-bit configuration control signal described above in Table 2 is set to "1" for free run. Control signals such as the horizontal drive signal HD and frame pulse FP are extracted from the video decoder in the state, the video signal reading from the frame memory 15 is synchronized with these synchronization signals HD and FP, and the video signal is reproduced by slave operation. You can also do it like this.

Here, an 8-bit configuration control signal supplied from the outside is
1100010/l, the image signal stored in the frame memory that is rewritten by the control signal will be displayed as it is, and the DO included in the control signal will be displayed as it is.
Set the C signal to “1” and set the control signal to 11110010/1
Alternatively, if it is set to 11111010, the video decoder operates as a mask and the displayed image is frozen.

In addition, the 8-bit configuration control signal supplied from the outside is
DOC included in its control signal as 110100/1
If the signal is controlled for each pixel, the DOC signal will be 0.
” will be replaced with the normal reception input signal. Therefore, if the DOC signal is controlled by an appropriate signal waveform and changed to “0” and “1”, it will be replaced with the reception input signal. Wipe switching with the memory playback signal can be performed. Also, the DOC signal can be changed to “0” at appropriate intervals.
, "1" and change the switching point at an appropriate density, it is possible to perform fade-like image switching, that is, fade-in and fade-out. Note that such image switching is performed in still image mode, so
Either the definition of the displayed image is not lost, or a sampling pattern appears at each boundary between displayed images that are alternately switched in the form of a fade, or at the boundaries between displayed images that are switched in a wipe.

In order to prevent the occurrence of sampling patterns in such boundary areas, control bits #5 and #6 in the 8-bit configuration control signal described above in Table 2 are set to "0".
By setting the control signal to 11100000/1 and operating the decoder in a normal state to perform motion detection, it is possible to prevent a sampling pattern from appearing on the display screen due to the mixing of stationary and moving pixel signals. . However, in this case, there is a possibility that aliasing distortion may appear in the image of the portion where motion has been detected.

Next, the memory reproduction image signal that is switched with the received input signal to add special effects is mainly loaded into the frame memory built into the video decoder, and a still image file is created that has only a buffer memory with a small memory capacity. An example of the configuration of the device is shown in FIG. As can be seen by comparing FIG. 6 with FIG. 5, the configuration shown in FIG. 6 is simply the frame memory 15 in the configuration shown in FIG. When using this memory, the DOC signal is set to "0" only in the part where data is loaded, and the DOC signal is set to "1" in all other parts. In addition, as mentioned above, if the switching between "0" and "1" of the DOC signal is controlled by an appropriate signal waveform, wiping etc. can be performed even if the still image file device has only a small capacity buffer memory. special effects can be added to the displayed image.

In addition, the control signal of 8-bit configuration is 11110010/1.
If the DOC signal is set to "0" in synchronization with the writing of the image signal to the buffer memory 19, the manner in which the image signal is written to the buffer memory 19 will appear on the display screen. Therefore, on the contrary, in order to prevent the state in which the image contents change due to writing to memory from appearing on the display screen, the 8-bit configuration control signal should be set to 11110110/1 so that the image displayed on the screen does not change. The image signal of a field different from the field of the signal is written to the memory, and when all fields have been written to the memory, the DOC signal is held at "1" and the control signal is set to 11110010/11110010.
1 or lllll100X. In the latter case, it will operate as a decoder or mask for the receiver.

Finally, FIG. 7 shows an example of the configuration of a forced interrupt signal generator used to add special effects such as superimposing characters on a display image. The illustrated signal generator has phases φ1 and φ2 corresponding to “lN”, “0” of the interframe subsample phase.
memories 21 and 22 and switching memories 23 and 24
The luminance sub-sample phase (Y-3S) and chromaticity sub-sample phase (C-3S) sent back from the interface section of the receiver, synchronization signals HD, FP,
16.2 Under the control of the timing control circuit 25 which supplied the M7 video clock, etc., superimposed information signals such as character signals from the superimposed signal generator 20 using computer graphics etc. are temporarily stored in alternating samples, It is reproduced at appropriate timing and supplied to the receiver interface section, and information such as characters is superimposed on the displayed image by forced interruption. 1. The capacity of each memory is about 2 bits for character superimposition, and when simply white or gray characters are superimposed, the superimposition signal can be fixed.
No memory is required.

The special effect addition function of character superimposition with the above configuration can be applied to displaying control information of the receiver on the display image, etc. In this case, the 8-bit configuration control signal supplied from the outside is ooooooo .

X, and 001 if the audio signal is also supplied from outside.
It becomes 0000X. Control bit for forced interrupt #
When 3 is set to "1", only the pixel at that insertion point is connected to the upper side of the switch S1 in the configuration shown in the first figure, and an external digital signal is input. Except for this switch S1, the operation on the receiver decoder side is the same as for normal received input analog signals, and operates as a mask, and the interrupt signal generator side, such as character signals, always operates as a slave. In addition, when superimposing characters on the displayed image, the receiver decoder must be synchronized to the received input analog signal, so if an external digital signal is inserted into the input analog signal other than the video signal, normal image reception will occur. The machine circuit cannot operate. Furthermore, when the FM mode is selected, de-emphasis is applied to the external digital signal that has been forcibly interrupted.Furthermore, since transmission r1 is constantly being corrected, r-1 correction is applied to character signals, etc. that have been forcibly interrupted. This will result in blurring. In addition, in order to forcefully interrupt characters, etc. at accurate positions on the display screen, a timing divider based on the sub-sample phase is required, and synchronization control using synchronization signals HD and FP is required. These control signals are supplied from the receiver decoder to the forced interrupt signal generator, as described above.

As mentioned above, on the input side of the receiver, the special effect of character superimposition that performs a forced interrupt on the converted output digital signal of the A/D converter 2 for the received input analog signal is added by the final stage D/A conversion of the decoder. Although the performance is inferior to the forced interrupt that occurs immediately before the device, the forced interrupt signal and the normal input digital signal are
Since it can be processed by the clock signal of MU
This method has the advantage that it is not necessary to provide a special interface or special video memory for superimposing characters on an SE display image.

(Effects of the Invention) As is clear from the above description, according to the side method of the high-definition receiver of the present invention, when adding special effects to the display image of the high-definition receiver, in particular, it is possible to optionally add special effects. When processing high-definition received signals, it is possible to add special effects by utilizing the image memory that is originally required to be built into the receiver, so it is possible to add special effects to the image sending device on the transmitting side, such as a still image file device. It is possible to reduce the burden on the image memory in preparation for

In addition, special effects can be added to the displayed image at each receiver without bothering the image transmitting device, which not only reduces the burden on the image transmitting device, but also adds new images to the high-definition receiver. This provides a special effect in that a display function is added and, by extension, a new form of high-definition broadcast program production can be developed.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of the configuration of the main parts of a high-definition receiver according to the present invention, Fig. 2 is a diagram showing the relationship between control signals and receiver operations according to the invention, and Fig. 3 is a diagram showing the relationship between control signals and receiver operations according to the present invention. A diagram showing an example of a time chart of a 4-field sequence, FIG. 4 is a block diagram showing an example of the configuration of a signal generator used in the control method of the present invention, and FIG. 5 is a still image file to be combined with the receiver according to the present invention. FIG. 6 is a block diagram showing an example of the configuration of the device; FIG. 6 is a block diagram showing another example of the configuration of a still image file device used in combination with the receiver according to the present invention; FIG. FIG. 2 is a block diagram showing a configuration example of a superimposing device. l...Tuner section 2...A/D converter 3.
... Equalizer (EQ) 4 ... De-emphasis circuit 5.15 ... Frame memory 6 ... Interpolation TCI decode circuit 7 ... Matrix circuit 8.12 ... D/A converter 9 ...・Synchronization generation circuits 10, 18...Audio time expansion circuit 11...Audio decoder 13.14.20...
Signal source 16...M [JSE synchronization generation circuit 17, 25...timing control circuit l9...
・Buffer memory 31 to S, ... changeover switch 21 to 24... memory

Claims (1)

[Claims] 1. Selection based on a control signal transmitted together with the image signal sample values when controlling the restored display using the memory of the high-definition image in a high-definition receiver that receives a high-definition image signal that has been band-compressed and transmitted by at least intermittent transmission of image signal sample values. By switching between the input image signal and the image signal reproduced from the memory under physical control, a high-definition image is restored and displayed with special effects including at least wipe, simple dissolve, cut change, and character superimposition. 1. A method for controlling a high-definition receiver, characterized in that: