JPH04339486A - Transmitting/receiving equipment for television signal - Google Patents

Abstract

PURPOSE:To hold the smoothness of a motion and to display the image whose dynamic resolution is excellent by demodulating a main signal transmitted from a transmitting side by a receiving side, and reproducing an image signal series of a sequential scanning system. CONSTITUTION:One side of an image signal series VP of a sequential scanning system obtained from a sequential scanning image pickup part 1 is inputted to an interlace scanning converting part 2. Subsequently, an image signal series VIP is generated by a rearranging operation, and also, a main signal VS is generated by an encoding part 3. Also, the other side of the series VP is inputted to an auxiliary signal extracting part 4, and a motion information series VM required for compensating smoothness of a motion by a difference arithmetic operation between frames is extracted. Subsequently, the main signal VS transmitted to a receiving side is inputted to a demodulating part 6, and a demodulates the series VIP. In this case, an auxiliary signal is also demodulated, and in a sequential scanning converting part, a picture array operation of the series VIP, and a frame operation using the series VM are executed, and the series VP is regenerated. In such a way, smoothness of a motion is held, and an image whose dynamic resolution characteristic is excellent is displayed on a sequential scanning display part 9.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television signal transmitting and receiving apparatus, and more particularly to a television signal transmitting and receiving apparatus suitable for transmitting high quality images with excellent dynamic resolution characteristics.

0002

[Prior Art] The following television signal transmission and reception systems are compatible with the current NTSC television system and enable image reproduction from still images to moving images with well-balanced resolution characteristics. It has been known.

[0003] In this system, imaging and display are performed in the form of sequential scanning, and on the transmitting side, the signal sequence of one frame of sequential scanning is rearranged to perform frame complete scanning conversion to form a signal sequence of interlaced scanning. conduct, current NTS
A signal in the form of interlaced scanning similar to the C television system is generated. Then, on the receiving side, the original signal sequence of one frame of sequential scanning is reproduced by rearranging the signal sequence of interlaced scanning. Then, by interpolating between frames using these reproduced signal sequences of 30 frames per second, a signal sequence of interpolated frames is generated, and a sequential scanning signal sequence of 60 frames per second required for display is generated. Playback is performed to improve dynamic resolution characteristics.

Furthermore, in this system, by superimposing color signals in the form of field line pairs, it is possible to completely separate the superimposed signals without crosstalk on the receiving side, thereby achieving high image quality.

[0005]

Although the above-mentioned method can improve dynamic resolution characteristics, there is a problem in that frame-complete scan conversion causes image quality disturbances that impair the smoothness of motion.

The object of the present invention is to solve the above-mentioned problems, eliminate jerkiness disturbance and stroboscopic disturbance that impair the smoothness of motion, and provide excellent dynamic resolution characteristics and compatibility with the current NTSC television system. An object of the present invention is to provide a television signal transmitting and receiving device having the following features.

[0007]

[Means for Solving the Problems] In order to achieve the above object, in the present invention, an auxiliary signal is added and transmitted on the transmitting side to eliminate jerkiness disturbance and stroboscopic disturbance that impair the smoothness of movement. , the receiving side performs scan conversion to a progressive scanning system using these auxiliary signals,
To preserve the smoothness of motion and realize image playback with excellent dynamic resolution characteristics.

[0008]

[Operation] Problems associated with the conventional frame complete scan conversion will be explained with reference to FIG. The figure shows a case where both the imaging system and the display system perform sequential scanning at 60 frames per second.

On the transmitting side, among the progressive scanning signal series obtained from the imaging system, by rearranging the scanning lines of the signal series of every two frames, the signal series of one frame of the interlaced scanning system is processed. Perform frame-complete scan conversion to generate . That is, by assigning the signals of the odd-numbered scanning lines a, c, and e of the frame to the signals of the first field of interlaced scanning, and the signals of the even-numbered scanning lines b, d to the signals of the second field, 30 frames per second can be interlaced. Generate a race scan signal sequence.

On the receiving side, a sequential scanning signal sequence of 30 frames per second is reproduced by rearranging the interlaced scanning signal sequence. On the other hand, the signal sequence of the frame indicated by the diagonal scanning line in the figure is generated by repeating the signal sequence of the previous frame, the average value of the signal sequence of the previous and following frames, etc. by interpolation between frames. and 6 per second
A signal sequence for sequential scanning of 0 frames is constructed.

[0011] Therefore, the final displayed image is
Similar to movies, this is equivalent to an image in which frames are dropped, and the smoothness of certain movements is impaired.

In order to eliminate the image quality disturbance that impairs the smoothness of motion in the conventional method, the present invention transmits the motion information that is lost due to frame complete scan conversion on the transmitting side as an auxiliary signal, and transmits it as an auxiliary signal on the receiving side. Scan conversion to progressive scanning is performed using this auxiliary signal.

An example of scan conversion using an auxiliary signal according to the present invention is shown in FIG. On the transmitting side, scanning lines a, b, c, d, e
An interlaced scanning signal sequence similar to the conventional method is generated from a sequential scanning signal sequence of frames consisting of . On the other hand, scan lines a', which are not used in this frame complete scan conversion,
Using a signal sequence of frames consisting of b', c', d', and e', motion information is extracted to compensate for the smoothness of motion. As this motion information, for example, a difference signal between frames (difference between signals of scanning lines a and a') is used. These motion information are transmitted as auxiliary signals in the form of interlaced scanning, for example.

On the receiving side, a sequential scan frame signal sequence consisting of scanning lines a, b, c, d, and e is reproduced by rearranging the interlaced scan signal sequence. On the other hand, a frame signal sequence consisting of scanning lines indicated by dots is generated from a reproduced frame signal sequence and an auxiliary signal. That is, the signal of the scanning line a' is reproduced by adding the inter-frame difference signal of the auxiliary signal to the signal of the scanning line a. This operation allows the signal sequence of the dropped frame to be restored, making it possible to display an image that preserves smoothness of motion.

As an example of scan conversion using an auxiliary signal, the form shown in FIG. 5 is also possible. In this example, on the transmitting side, an interlaced scanning signal sequence is generated by thinning out the scanning lines of the progressive scanning signal sequence. On the other hand, as the motion information, a difference signal between frames for scanning lines missing in interlaced scanning is used. On the receiving side, the interlaced scanning signal sequence is rearranged into corresponding progressive scanning scanning lines. Then, interpolated scanning lines of the scanning lines indicated by dots are generated by adding the difference signal between frames of the auxiliary signal to the signal of the rearranged scanning line, thereby restoring the signal sequence of the progressive scanning system. Through this operation, it is possible to display an image in which smoothness of movement is preserved.

In this example, since the scanning line signals of the first and second fields of the interlaced scanning system are generated from signal sequences of different frames of the progressive scanning system, compared with the example of FIG. Therefore, even in an interlaced scanning system, it is possible to eliminate image quality deterioration that impairs the smoothness of motion.

As described above, by scan conversion using an auxiliary signal according to the present invention, it is possible to display an image that has excellent dynamic resolution characteristics and preserves smoothness of motion.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the basic overall block configuration on the transmitting side according to the present invention. A progressive scanning image signal series VP (for example, three primary colors R) obtained from the progressive scanning imaging section 1
, G, B signals, or luminance Y, color difference I, Q signals, etc.)
One of them is input to the interlaced scanning converter 2, and an interlaced scanning image signal series VIP similar to that of the current television system is generated by rearranging the signals as shown in FIGS. 4 and 5, for example. Then, the encoding unit 3 performs encoding processing similar to the current NTSC system to generate the main signal VS. This main signal VS is a television signal that is compatible with the current system.

On the other hand, the other part of the image signal series VP is input to the auxiliary signal extracting section 4, which extracts a motion information series VM necessary for compensating for smoothness of motion by calculating the difference between frames. Then, the auxiliary signal encoder 5
A modulation operation or the like is performed in the auxiliary signal VH to generate an auxiliary signal VH in a form suitable for the transmission medium.

FIG. 2 shows an embodiment of the basic overall block configuration of the receiving side according to the present invention. The main signal VS is input to the demodulation section 6, which performs a predetermined demodulation operation to demodulate the interlaced scanning image signal series VIP. On the other hand, the auxiliary signal VH undergoes demodulation processing in the auxiliary signal demodulation section 7 and is demodulated into a motion information sequence VM. The progressive scan converter 8 performs image arrangement operations on the signal series VIP and motion information series VM.
A frame interpolation operation using a frame interpolation operation or an interpolation scanning line generation operation is performed to reproduce a progressive scanning image signal series VP. This signal sequence is then input to the sequential scanning display section 9, which preserves the smoothness of the motion and displays an image with excellent dynamic resolution characteristics.

Next, the present invention will be explained based on an example in which the form of the main signal VS is shown in FIG. The main signal VS shown in the figure constitutes a television signal by frame complete scan conversion and signal multiplexing using field line pairs. Figure (a) shows a one-dimensional signal spectrum, and the color difference signals I and Q are frequency-multiplexed as a color signal C in the region of the luminance mid-range component YM by orthogonal amplitude modulation using the color subcarrier fsc, as in the current NTSC system. do. FIG. 5B shows the form of frame-complete scan conversion and field line pairs for each signal component.

The luminance low frequency component YL is as shown in FIG.
An interlaced scanning signal sequence is generated by rearranging the frame signal sequence every two frames. In addition, the luminance mid-range component YM and the color difference signals I and Q are also rearranged in a similar manner to generate an interlaced scanning signal sequence, but for the scanning lines of the first and second fields forming a field line pair, The same signal component, e.g. two in a progressive scanning system
Assign the average value of the scanning line signal, etc.

Each block on the transmitting side and the receiving side will be explained below based on an embodiment.

FIG. 7 shows an embodiment of the interlaced scan converter 2 on the transmitting side. This realizes frame-complete scan conversion corresponding to the luminance low-band signal YL, and is composed of a memory circuit 10 and a memory control circuit 11, and performs write operations to the memory circuit (hereinafter referred to as WT operation), and from the memory circuit. Conversion to an interlaced scanning system is performed by controlling the readout operation (hereinafter abbreviated as RD operation).

For the input signal VP of the progressive scanning system, a signal sequence of one frame is written into the memory circuit 10 by the WT operation every two frame periods. On the other hand, the memory circuit 10
In the first field period of the interlaced scanning system, signals corresponding to the odd numbered scanning lines a, c, ... and in the second field period, the signals corresponding to the even numbered scanning lines b, d, ... are read out from the RD. Do it through movement. Note that the RD operation is performed at half the operating speed of the WT operation, and the signal sequence of one frame of the progressive scanning system is read out during the period of one frame of the interlaced scanning system.

FIG. 8 shows an embodiment of the interlaced scan converter 2 corresponding to the luminance middle range signal YM and color difference signals I and Q forming a field line pair.

The combination of the 1-line delay circuit 12, the averaging circuit 12, and the switch circuit 14 generates a signal component VFP to be assigned to the field line pair. That is, the signal VP and the signal VPD delayed by one line period in the sequential scanning system by the one line delay circuit 12 are input to the averaging circuit 13, and the average value of both signals is output as the signal VAV.
Output as . The signal VAV and the signal VAVD delayed by one line period are alternately selected by the switch circuit 14 every line period according to the control signal CT1, and the signal component VFP of the field line pair is generated. This signal corresponds to the WT operation of the memory circuit 10 similar to that shown in FIG.
The D operation generates an interlaced scanning signal series VIFP forming a field line pair.

FIG. 9 shows an embodiment of the encoding section 3 on the transmitting side. A predetermined low frequency component is extracted from the interlaced scanning luminance signal Y generated in the embodiment of FIG. 7 by the LPF circuit 15 to generate a luminance low frequency signal VL. On the other hand, the luminance signal VFP, color difference signals IFP, and QFP generated in the embodiment of FIG.
Generate Q. The color difference signals I and Q are input to a modulation circuit 19, and a color signal C is generated by performing orthogonal amplitude modulation on the color subcarrier fsc, similar to the current NTSC system. In the mixing circuit 20, the signals YL, YM, and C are added to produce the result shown in FIG. 6(a).
Generate a signal with the spectrum shown in . Then, a synchronization signal, a burst signal, etc. are added in the process circuit 21 to generate the main signal VS.

FIG. 10 shows an embodiment of the auxiliary signal extractor 4 on the transmitting side. In this embodiment, a case is shown in which the motion information that compensates for the smoothness of motion is a difference signal between frames. Progressive scanning signal series VP1 and 1 frame delay circuit 2
2, the signal delayed by one frame period is sent to the differential circuit 23.
, and a difference signal component between frames is extracted by performing a difference calculation operation between both signals. This signal is supplied to the memory circuit 10, and a motion information sequence VM converted into an interlaced scanning system is generated by WT operation and RS operation similar to those shown in FIG. It should be noted that since the color signal has deteriorated visual characteristics with respect to motion compared to the luminance signal, motion information may be extracted from the luminance signal.

FIG. 11 shows an embodiment of the auxiliary signal encoder 5 on the transmitting side. In this embodiment, the auxiliary signal VH is
This shows the case of transmission using the same channel band as the method. A constant DC level is applied to the motion information series VM by a level shift circuit 24, and the signal components are level-shifted so that the amplitude value falls within the standard of the current NTSC system. Then, a process circuit 21 adds a synchronization signal, a burst signal, a reference DC level, etc. to generate an auxiliary signal VH.

FIG. 12 shows another embodiment of the auxiliary signal encoder 5. In this embodiment, frequency interleaving multiplexing is performed to reduce the band required for transmitting the auxiliary signal VH. The motion information series VM is processed by the LPF circuit 25,
The HPF circuit 26 generates a low band signal VML and a high band signal VMH.
Separate into The signal VMH is frequency-shifted to a low frequency band of 0 to 0.5 fsc by performing carrier suppression amplitude modulation using a subcarrier 0.5 fsc' (frequency is 0.5 fsc, phase is inverted for each line) in a frequency shift circuit 27. A signal VMHH is generated. Then, the mixing circuit 28 adds the two to generate a frequency interleaved multiplexed signal. This signal is subjected to a level shift operation similar to that in FIG.
Then, a synchronizing signal is added, etc., and an auxiliary signal VH is generated.

This completes the explanation of the transmitting side block, and next the receiving side block will be explained with reference to an embodiment.

FIG. 13 shows an embodiment of the demodulator 6 on the receiving side. The main signal VS is converted into a luminance low frequency signal Y by the LPF circuit 15.
Separate L. The subtraction circuit 29 performs an operation of subtracting the luminance low frequency signal YL from the main signal VS, and extracts a YM&C signal in which the luminance low frequency signal and the color signal are mixed. This signal is supplied to the YC separation circuit 30 and separated into a luminance middle range signal YM and a chrominance signal C, respectively. The color signal C is input to the synchronous detection circuit 31, which performs synchronous detection using the color subcarrier fsc, and extracts demodulated color difference signals IFP and QFP through the LPF circuits 17 and 18. On the other hand, the luminance low-range signal and the luminance middle-range signal YM whose delay has been adjusted by the delay circuit 32 are added together by the adder circuit 33 to extract the luminance signal Y.

FIG. 14 shows one embodiment of the YC separation circuit 30. Since the signals YM and C form a field line pair, YC separation can be realized by adding and subtracting operations between fields. That is, the addition circuit 33 and the subtraction circuit 29 perform addition and subtraction operations on the input signal and the signal delayed by 263 line periods by the 263 line delay circuit 34, respectively. Separate brightness and color components. The luminance component is 26
The signal delayed by the 3-line delay circuit 34 and the signal delayed by the switch circuit 36 are alternately selected for each field period to separate and extract the brightness mid-range signal YM. On the other hand, for the color component, a signal delayed by a 263-line delay circuit 34 and a signal whose polarity is inverted by a polarity inversion circuit 35 are alternately selected by a switch circuit 36 at a field period to separate and extract a color signal C.

FIG. 15 shows an embodiment of the auxiliary signal demodulator 7 on the receiving side. This embodiment demodulates the auxiliary signal obtained in the embodiment of FIG. 12. The comb filter circuit 37 extracts the signal VMHH which has been frequency interleaved multiplexed by a line comb filter. This signal undergoes synchronous detection using a subcarrier of 0.5 fsc' in a frequency inverse shift circuit 38, extracts its upper sideband component, and demodulates the signal VMH shifted to the original frequency band. on the other hand,
The signal obtained by the subtraction operation in the subtraction circuit 39 has its DC level removed in a level shift circuit 40 and becomes a signal VML.
demodulate. Then, the adder circuit 41 adds them together, and
Demodulate the motion information series VM.

FIG. 16 shows an embodiment of the progressive scan conversion section 8 of the receiving section. The figure corresponds to a luminance signal. Interlaced scanning signal series VIP, motion information series VM
The addition circuit 42 performs an addition operation on both signals, and corresponds to the frame in which the frames have been dropped. Restores an interlaced scanning signal sequence. The process of converting an interlaced scanning signal sequence into a progressive scanning signal sequence by rearranging the signal sequence is performed by performing the WT operation and RD operation of the memory circuits 43 and 45 using control signals from the memory control circuits 44 and 46. Realize. That is, W to the memory circuits 43 and 45
The T operation is performed periodically for one frame period of interlaced scanning. The RD operation from the memory circuits 43 and 45 is performed during one frame period of the sequential scanning system at twice the operating speed of the WT operation. In this case, the first
The signal series VPM of the progressive scanning system is controlled to read out the signal series of the scanning lines of the field and the second field alternately every line period of the progressive scanning system, and the rearrangement operation is performed.
, VPIP is generated. Both signals are sent to the switch circuit 47
The signals are selected and output alternately every frame period of the progressive scanning system to generate a desired progressive scanning signal sequence VP.

On the other hand, FIG. 17 shows an embodiment of the progressive scan converter 8 corresponding to color difference signals. This embodiment is for the case where an interpolated frame is generated using the signal of the previous frame. W of the memory composed of the memory circuit 43 and the memory control circuit 44
The T operation and the RD operation generate a progressive scanning signal sequence VPM in which the interlaced scanning signal sequence is rearranged. This signal sequence is processed by the 1-frame delay circuit 22.
A signal sequence VPMD corresponding to the interpolated frame is generated by delaying the frame period. The switch circuit 47 alternately selects and outputs both signals every frame period to generate a desired progressive scanning signal series VP.

This completes the explanation of the present invention for the television signal of the form shown in FIG. Next, a second embodiment in which the present invention is applied to a television signal of the form shown in FIG. 18 will be described. In this television signal, the luminance high frequency signal YH (4.2 M
Hz or higher) to a 2 to 4.1 MHz band by frequency shifting and superimposed as a high-definition signal YHH.

FIG. 4B shows the signal spectrum in the vertical two-dimensional frequency domain at this time. Color signal C is the second
, and the fourth quadrant, and the high-definition signal YHH is placed in the first and third quadrants that are conjugate thereto. This television signal also undergoes frame complete scanning conversion and signal multiplexing using field line pairs.

The luminance low range signal YL and the color difference signals I and Q are similar to those shown in FIG. 6(b), but the luminance middle range signal Y
M, luminance high frequency signal YH form a field line pair in two frames of interlaced scanning as shown in FIG. 18(c). Then, the average value of the signals of the four scanning lines of the sequential scanning system is assigned to these scanning lines.

In this embodiment, the signals YL, I, Q,
and the auxiliary signal VH can be realized in the same manner as in the previous embodiment, and therefore an embodiment related to the signals YM and YH will be described below.

FIG. 19 shows an embodiment of the interlaced scan converter 2 on the transmitting side. The signal VIFP formed into a field line pair in one frame of interlaced scanning by the scan conversion circuit 48 having the configuration shown in FIG. is input, and the average value of both signals is output. The switch circuit 51 outputs the output signal of the averaging circuit 50 and the one-frame delay circuit 49 for each frame period.
The output signals of are alternately selected to generate a signal series VIPF of field line pairs in units of two frames as shown in FIG. 18(c).

FIG. 20 shows an embodiment of the encoding section 3 on the transmitting side. The luminance signal series YFP of the field line pair in units of two frames is transmitted through the BPF circuit 52 and the HPF circuit 5.
3, the desired band limit processing is performed to extract YM and YH. Signal YH is converted to subcarrier μ0 by frequency shift circuit 54.
(μ0=16/7 fsc, phase is inverted for each line and each field), carrier wave suppression amplitude modulation is performed, and the lower sideband component is extracted to generate a high-definition signal YHH. The mixing circuit 55 adds these signals, and the process circuit 5
6, a synchronization signal, a burst signal, μ0 phase information, etc. are added to generate a television signal VS having the spectrum shown in FIG. 18(a).

FIG. 21 shows an embodiment of the demodulator 6 on the receiving side. The signal VL separated and extracted by the LPF circuit 15 is input to a subtraction circuit 29, and a signal component in which the signals YM, YHH, and C are mixed is extracted by subtraction operation with the signal VS. A separation circuit 57 separates and extracts this signal into a brightness mid-range signal YM, a high-definition signal YHH, and a color signal C, respectively. The frequency inverse shift circuit 58 performs synchronous detection of the high-definition signal YHH using the subcarrier μ0, extracts its upper sideband component, and demodulates the luminance high-band signal YH. The luminance low frequency signal whose delay has been adjusted by the delay circuit 59 and the signals YM and YH are added together by the adder circuit 60 to demodulate the luminance signal Y.

FIG. 22 shows an embodiment of this separation circuit 57. The YC separation circuit 30 separates color components and luminance components (YM
, YHH). As for the luminance component, the signal YM and the signal YHH are separated and extracted by arithmetic operations between frames. That is, the brightness middle range signal YM is separated and extracted by adding the signal delayed by one frame period in the one frame delay circuit 49. On the other hand, by subtracting the high-definition signal YHH
Separate and extract. Note that the switch circuit 62 selectively outputs signals alternately for each frame period, so that components of field line pairs in units of two frames can be separated and extracted.

The description of the second embodiment has been completed above, and next, the third embodiment of the present invention will be explained. This embodiment corresponds to the format of the television signal shown in FIG. In this television signal, scan conversion from a progressive scanning system to an interlaced scanning system is performed as shown in Figure 5(b).
As explained in , the difference is that it is realized by the thinning operation. Another difference is that the average value of the signal of the scanning line of the adjacent frame (for example, the average value of the signal of the scanning line a and the scanning line b of the next frame is used) is assigned to the signal component of the field line pair. The configuration of each block in this embodiment will be explained below.

FIG. 24 shows an embodiment of the interlaced scan converter 2 on the transmitting side for the luminance low-band signal YL. By controlling the WT operation and RD operation of the memory circuit 63 by the memory control circuit 64, a thinning operation is realized and an interlaced scanning signal series VIP is generated. That is, with respect to the sequential scanning signal series VP, the memory circuit 63 performs the WT operation on the signal series of the scanning lines a, c, e, g, . . . at intervals of two line periods. On the other hand, the RD operation is performed every one line period of interlaced scanning at half the operating speed of the WT operation, thereby realizing scan conversion to an interlaced scanning system.

FIG. 25 shows an embodiment of the interlaced scan converter 2 on the transmitting side that corresponds to the luminance mid-range signal YM and color difference signals I and Q forming a field line pair. The progressive scanning signal series VP and the signal delayed by the 526 line period of the progressive scanning system by the 526 line delay circuit 65 generate an average value of both signals in the averaging circuit 66 and are supplied to the memory circuit 63. The memory circuit 63 is a WT similar to that shown in FIG.
RD operation and RD operation are performed, and an interlaced scanning signal sequence is generated by thinning operation. Then, the signal delayed by 263 line periods of the interlaced scanning system by the 263 line delay circuit 34 is alternately selected and outputted by the switch circuit 67 for each field period to generate a signal sequence of field line pairs.

FIG. 26 shows an embodiment of the auxiliary signal extractor 4 on the transmitting side. This complementary example shows a case where a difference signal between frames is used as motion information to compensate for smoothness of motion. The signal series VP of progressive scanning and the signal delayed by one frame period of progressive scanning by the one frame delay circuit 22 are used in a difference circuit 23 to generate an interframe difference signal VFD by performing a subtraction operation between both signals.

This signal is converted into an interlaced scanning signal series VMM by the WT operation and RD operation of the memory constituted by the memory circuit 68 and the memory control circuit 69. That is, the memory circuit 68 performs the WT operation for one frame of signal sequence every two frame periods of sequential scanning.

On the other hand, the RD operation is performed at 1/2 the operation speed of the WT operation every one frame period of the interlaced scanning system. In the period of this first field, the odd numbered scanning line a
, c, . . . During the second field period, signal sequences corresponding to even numbered scanning lines b, d . . . are read out to generate the signal VMM. The switch circuit 71 selectively outputs the signal VMM in the first field of interlaced scanning, and the signal whose polarity has been inverted by the polarity inversion circuit 70 in the second field, thereby generating a motion information series VM. Note that this motion information sequence is generated for the luminance signal.

[0052] Encoding section 3 and auxiliary signal encoding section 5 on the transmitting side
can be realized by the embodiments described so far, and will therefore be omitted.

FIG. 27 shows an embodiment of the progressive scan converter 8 on the receiving side. This is an example corresponding to a luminance signal. An adder circuit 72 adds the motion information signal VM to the signal VIP to generate a signal series VIPM of the interpolated scanning line. signal V
IP and VIPM are memory circuits 73 and 75 by WT operation whose period is one frame period of interlaced scanning system.
will be written to.

On the other hand, reading from the memory circuit is performed by intermittent RD operation every other line period, with a period of two frame periods in the progressive scanning system. In this case, the memory circuit 73 generates the signal sequence VPM by reading out the signal sequence of odd-numbered scanning lines in the first frame period and the signal sequence of even-numbered scanning lines in the next frame period.

On the other hand, the memory circuit 75 reads out the signal sequences of the even scanning lines in the first frame period and the odd scanning lines in the next frame period to generate the signal sequence VPIP. The switch circuit 77 alternately selects and outputs these signals for each line period to generate a progressive scanning signal series VP.

Regarding the color difference signal, scanning conversion of the interpolated scanning line signal sequence to a progressive scanning signal sequence generated by the average value of the upper and lower scanning lines of the same field is realized. Since the progressive scan converter 8 can be easily constructed, a description of the embodiment will be omitted. Furthermore, the demodulator 6 and the auxiliary signal demodulator 7 on the receiving side can be implemented in the previous embodiments, so their description will be omitted.

This concludes the explanation of the third embodiment. The signal spectrum of the television signal is shown in Figure 1.
The case shown in 8(a) can also be realized in the same way as this embodiment.

In the first to third embodiments shown above, the auxiliary signal VH is transmitted on a channel different from the main signal. However, this auxiliary signal is transmitted on the same channel as the main signal. It is also possible to implement this in a form of transmission. An example of this is shown in FIG. This embodiment is compatible with the current television system and is suitable for the letterbox method for widening the screen.

In the letterbox method, a television signal is constructed in such a way that an image signal with a wind aspect ratio (16:9) is placed as the main signal VS in the main area at the center of the screen with the current aspect ratio (4:3). do. Therefore, with this method, the auxiliary signal VH of the present invention can be transmitted while being superimposed on the areas of the upper mask section and the lower mask section shown by diagonal lines.

FIG. 29 shows the overall block configuration of an embodiment on the transmitting side. The wide aspect ratio progressive scanning signal sequence obtained from the wide screen progressive scanning imaging section 78 is input to the scanning line number converting section 79, and the scanning line number is converted to display the wide aspect image in the main area of the screen of the current aspect ratio. A compression operation of 3/4 of the number, e.g. 480 scan lines to 36
A signal sequence VP is generated by converting the number of scanning lines to 0. The interlaced scan conversion section 80 performs scan conversion from this progressive scanning signal sequence to an interlaced scanning system as shown in FIG. Main signal V of the area
Generate S.

On the other hand, the auxiliary signal extraction unit 82 extracts a motion information sequence VM that compensates for smoothness of motion, such as a difference signal between frames, and the auxiliary signal encoding unit 83 performs predetermined encoding processing and time axis alignment. A changing operation is performed to generate auxiliary signals VH for the upper and lower mask portion regions. Signal superimposition section 8
In step 4, the main signal VS and the auxiliary signal VH are combined to generate a television signal in the form shown in FIG.

FIG. 30 shows the overall block configuration of an embodiment on the receiving side. The signal separation unit 85 separates the main signal VS and the auxiliary signal V.
Separate into H. The main signal VS undergoes predetermined demodulation operations (separation of multiplexed signals and demodulation) in the main signal demodulation section 86. The auxiliary signal VH undergoes a predetermined demodulation operation in the auxiliary signal demodulation section 87 to reproduce the motion information series VM. The progressive scan converter 88 uses the signal series VIP and VM to perform scan conversion into a progressive scan signal series VP. The scanning line number inverse conversion section 89 performs an operation of enlarging the number of scanning lines by 4/3, for example, converting the number of scanning lines from 360 to 480, and supplies the result to the wide screen progressive scanning display section 90. Display wide aspect images.

Next, FIG. 31 shows an embodiment of the auxiliary signal encoding section 83 on the transmitting side. Similar to the embodiment shown in FIG. 12, the high-frequency component of the signal VM extracted by the HPF circuit 26 is converted into a low-frequency component by the frequency shift circuit 27, and both signals are added together by the mixing circuit 28 to perform frequency interleave multiplexing. generate a signal sequence. In order to insert this signal series into the upper and lower mask area, the time axis compression circuit 91
/2 Perform operations such as compression, and time axis rearrangement circuit 92
The time axis is rearranged to positions corresponding to the upper mask area and the lower mask area. Then, a level shift circuit 24 adds a constant DC level to the auxiliary signal V.
Generate H. Note that depending on the form of the motion information signal VM, it is also possible to configure the auxiliary signal encoding section by a combination of the time axis rearrangement circuit 92 and the level shift circuit 24.

Further, the respective blocks on the transmitting side and the receiving side can be easily realized using the embodiments described so far and conventional techniques, so the explanation will be omitted.

[0065]

[Effects of the Invention] According to the present invention, motion information that compensates for the smoothness of motion enables the receiving side to display high-quality images with excellent dynamic resolution characteristics, a natural feel, and a sense of stability. A great effect can be obtained in improving image quality.

[0066] In this embodiment, a case has been described in which a difference signal between frames is used as motion information. However, the present invention is not limited to this, and the present invention may use, for example, a motion vector as motion information. It can also be applied in cases.

[0067] Furthermore, when the motion information is transmitted by the auxiliary signal VH, various formats such as a digital format are possible in addition to the present embodiment.

Further, in this embodiment, a case has been described in which the luminance component of the image signal is used to extract motion information, but it is clear that it is also possible to use, for example, three primary color signal components.

[Brief explanation of drawings]

FIG. 1 is an overall block diagram of a transmitting device according to an embodiment of the present invention.

FIG. 2 is an overall block diagram of a receiving device according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram of scan conversion showing a conventional example.

FIG. 4 is an explanatory diagram of scan conversion in the embodiment of the present invention.

FIG. 5 is an explanatory diagram of scan conversion in the embodiment of the present invention.

FIG. 6 is an explanatory diagram of the form of the main signal VS in one embodiment of the present invention.

FIG. 7 is an explanatory diagram of an interlaced scan converter in an embodiment of the present invention.

FIG. 8 is an explanatory diagram of an interlaced scan converter in an embodiment of the present invention.

FIG. 9 is a block diagram of an encoding unit in an embodiment of the present invention.

FIG. 10 is a block diagram of an auxiliary signal extractor in an embodiment of the present invention.

FIG. 11 is a block diagram of an auxiliary signal encoder in an embodiment of the present invention.

FIG. 12 is a block diagram of an auxiliary signal encoder in an embodiment of the present invention.

FIG. 13 is a block diagram of a demodulator in an embodiment of the present invention.

FIG. 14 shows Y of the demodulator in the embodiment of the present invention.
A block diagram of a C separation circuit.

FIG. 15 is a block diagram of an auxiliary signal demodulation section in an embodiment of the present invention.

FIG. 16 is a block diagram of a progressive scan transformation unit in an embodiment of the present invention.

FIG. 17 is a block diagram of a progressive scan transformation unit in an embodiment of the present invention.

FIG. 18 is an explanatory diagram of the form of the main signal VS in another embodiment of the present invention.

FIG. 19 is a block diagram of an interlaced scan converter in an embodiment of the present invention.

FIG. 20 is a block diagram of an encoding unit in an embodiment of the present invention.

FIG. 21 is a block diagram of a demodulator in an embodiment of the present invention.

FIG. 22 shows Y of the demodulator in the embodiment of the present invention.
A block diagram of a C separation circuit.

FIG. 23 is an explanatory diagram of the form of the main signal VS in still another embodiment of the present invention.

FIG. 24 is an explanatory diagram of an interlaced scan converter in an embodiment of the present invention.

FIG. 25 is a block diagram of an interlaced scan converter in an embodiment of the present invention.

FIG. 26 is a block diagram of a signal auxiliary extractor in an embodiment of the present invention.

FIG. 27 is a block diagram of a progressive scan converter in an embodiment of the present invention.

FIG. 28 is an explanatory diagram of auxiliary signal transmission in an example in which the present invention is implemented using a letterbox method.

FIG. 29 is a block diagram of a transmitting device in an embodiment of the present invention.

FIG. 30 is a block diagram of a transmitting device in an embodiment of the present invention.

FIG. 31 is a block diagram of an auxiliary signal encoder in an embodiment of the present invention.

[Explanation of symbols]

1... Sequential scanning imaging section, 2, 80... Interlaced scanning conversion section, 3, 81... Encoding section, 4, 82... Auxiliary signal extraction section,
5, 83... Auxiliary signal encoder, 6... Demodulator, 7, 87...
Auxiliary signal demodulation unit, 8, 88... Progressive scan conversion unit, 9... Progressive scan display unit, 10, 43, 45, 63, 68, 73, 7
5...Memory circuit, 11, 44, 46, 64, 69, 74
, 76...Memory control circuit, 12...1 line delay circuit, 1
3, 50, 66...average circuit, 14, 36, 47, 51,
62, 67, 71, 77...switch circuit, 15, 17,
18, 25... LPF circuit, 16, 26, 53... HPF circuit, 20, 28, 55... Mixing circuit, 19... Modulation circuit, 2
1, 56...process circuit, 22...1 frame delay circuit,
23...Differential circuit, 24, 40...Level shift circuit, 27
, 54... Frequency shift circuit, 29, 39... Subtraction circuit, 3
0...YC separation circuit, 31...synchronous detection circuit, 32, 59,
61... Delay circuit, 33, 41, 42, 60, 72... Addition circuit, 34... 263 line delay circuit, 35, 70... Polarity inversion circuit, 37... Comb filter circuit, 38, 58... Frequency inverse shift circuit, 48 ... Scan conversion circuit, 49 ... 1 frame delay circuit, 52 ... BPF circuit, 57 ... Separation circuit, 65
...526 line delay circuit, 78... Wide screen sequential scanning imaging section, 79... Scanning line number conversion section, 84... Signal superimposition section, 85
. . . Signal separation unit, 86 . . . Main signal demodulation unit, 89 . . . Scanning line number inverse conversion unit, 90 .

Claims (7)

[Claims] 1. Means for generating an image signal sequence VIP in the form of interlaced scanning of the current television system by interlacing scanning converting the image signal sequence VP into the form of progressive scanning on the transmitting side, a motion for compensating for the smoothness of the movement. information signal VM
A television signal is constructed by a means for generating a signal and a means for multiplexing a signal in the signal form of a field line pair, and on the receiving side, a demodulated image signal sequence in the form of interlaced scanning and an interpolated scanning line based on the motion information signal are reproduced. ,
A television signal transmitting/receiving device characterized by displaying an image signal sequence generated by progressive scan conversion. 2. Claim 1, wherein the motion information signal VM is transmitted in upper and lower mask regions using a letterbox method.
The television signal transmitting and receiving device described above. 3. The television signal transmitting/receiving apparatus according to claim 1, wherein the interlaced scan conversion is frame-complete scan conversion. 4. Claim 1, wherein the interlaced scan conversion is performed by a scan line thinning operation of progressive scanning.
, 2. The television signal transmitting/receiving device according to . 5. Claims 1, 2, and 3, wherein the motion information signal VM is generated based on a difference signal between frames.
, 4. The television signal transmitting/receiving device according to . 6. Claims 1 and 2, wherein the motion information signal VM is generated based on a motion vector between frames.
, 3, 4. The television signal transmitting/receiving device according to . 7. The motion information signal VM is generated based on the luminance component of the image signal.
7. The television signal transmitting/receiving device as described in 4, 5, or 6.