JPH06105291A - Multiple signal transmitter - Google Patents

Abstract

PURPOSE:To attain a vertical and horizontal high band by effectively using up and down no-picture parts. CONSTITUTION:A wide picture signal is band-limited by a VLPF 103 and an adder 104, and separated into a main signal and vertical high frequency components (Vh signal). The Vh signal is set in band by a vertical frequency shift, vertical compression, and Vh processing part. The main signal is vertical compression-processed, band-limited in time direction by a still picture processing part 108, the main part is set in band by an animation processing part 109, and vertical high pass components (Vt signal) are separated. The Vh signal and the Vh signal are mixed by a mixer 113 according to a picture movement. The outputs of the still picture and animation processing parts are mixed by a mixer 111 according to the picture movement. The output of each mixer is interlace-converted. Then, horizontal high-pass components are subtracted from the main signal of the output of the mixer 111 and band-set by an LPF 116, subtracter 117, and Hh processing part 119. The Vh/Vt signal and the Hh signal are multiplexed in the different areas of the up and down no-picture parts, and the main signal is arranged in the center part area, so that a television signal can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of transmitting a wide aspect signal capable of forming a screen horizontally longer than a screen displayed by an image signal used in a television system of the current system, In addition, the present invention relates to a multiple signal transmission device having a transmission system devised so that the transmission signal can be received and reproduced even by a television receiver of the current system.

[0002]

2. Description of the Related Art In recent years, a wide-screen television signal (wide aspect signal) having a horizontal aspect ratio (for example, 16: 9) rather than an aspect ratio (4: 3) of a screen displayed by a television signal of the current system. Is being researched and developed for a television system capable of transmitting while maintaining compatibility with the current television system. Such wide aspect signal transmission methods are roughly classified into a side panel method and a letterbox method.

Here, the letterbox system will be described. FIG. 6 is an explanatory view of a screen shown for explaining the letterbox method. An image signal having an aspect ratio of 16: 9 is compressed vertically (in the vertical direction) and processed so as to fit on a screen having an aspect ratio of 4: 3. Also, by compression,
There are upper and lower non-image parts in the upper and lower parts of the screen. A high-resolution signal missing from the center portion due to compression processing is multiplexed on the upper and lower non-image portions, and can be used when restoring a wide aspect signal. Therefore, in the decoder, the center part is vertically expanded, and the high-resolution signals multiplexed in the upper and lower non-image parts are reproduced and added to the expanded image signal.

As a document describing the letter box system, a technical report of the Television Society of Japan (September 1989 Vol.
13, No. 44, pp. 37-42) "One method of improving vertical frequency characteristics by letterbox method".

FIG. 7 is a diagram for explaining the compression principle in the letterbox system. The 16: 9 original image signal is used as a progressive scanning signal of 480 [television book]. In order to display an image signal on a screen having an aspect ratio of 4: 3 without distortion, it is necessary to compress the image signal by 3/4 in the vertical direction to form a 360 [TV book] signal. Furthermore, in order to be able to receive and display even on the current type of television receiver, it must be interlaced. Then, it is necessary to convert into a signal of 180 [television book] per field. The above-mentioned document discloses a method of converting a progressive scan wide aspect signal of 480 [television book] into an interlace signal of 360 [television book].

As shown in FIG. 7 (a), a progressive scanning signal of 480 [television books] is matrix-operated for every eight lines, and the resulting three lines are placed in the center part and the remaining five lines are placed in upper and lower non-image parts. I am trying to multiplex. Therefore, 480 in 1/60 seconds
The [television book] signal is converted into a 180 [television book] signal in 1/60 seconds and becomes an interlaced signal which is vertically compressed. In the same figure (b), the matrix calculation formula is shown. When performing the 8 × 8 matrix operation, it is possible to convert the signal into a signal compatible with the current receiver by appropriately selecting the coefficient. Moreover, the horizontal band of the 5 signals for multiplexing the upper and lower non-picture areas is limited to 0.8 MHz,
By being compressed for twice the time, it is possible to arrange in 60 areas in 1/60 seconds for multiplex transmission. FIG. 8 shows an encoder for realizing the above letterbox method, and FIG. 9 shows a decoder.

The encoder of FIG. 8 will be described. Input terminal 1
201, 1202, 1203 are provided with R,
G and B signals are input. This signal has an aspect ratio of 1
It is a progressive scanning signal of 6: 9,480 [television book].
The R, G, B signals are guided to a matrix circuit 1204, converted into luminance signals Y, I signals, and Q signals, and then input to an analog / digital (A / D) converter 1205.
The digitized luminance signal Y is serial parallel (S
-P) It is supplied to the converter 1206, and the I signal and the Q signal are supplied to the selector that performs the selection operation in pixel units. SP
The converter 1206 outputs signals from eight scanning lines in parallel and supplies the signals to the matrix circuit 1207 to execute matrix calculation. Of the obtained calculation results, three signals are output in parallel, and the parallel-serial (PS) converter 1
The signal is supplied to 208, serially converted, and output as a center signal. The remaining five signals are supplied to the P-S converter 1211, serially converted into a horizontal low-pass filter (HL).
The band is limited to 0.8 MHz at PF) 1212. The band-limited signal is input to the 1/5 times compression circuit 1213, compressed to 1/5 times, and then input to the rearrangement circuit 1214 to be multiplexed in the upper and lower non-image parts. When 0.8MHz signal is compressed to 1/5, it becomes 0.8 × 5 = 4MHz.
This is a frequency that can be transmitted in the current television signal band. The center portion signal is converted into an interlaced signal by the interlace converter 1209 and supplied to the selector 1210. The selector 1210 selects the output from the rearrangement circuit 1214 in the upper and lower non-image parts, selects the signal from the interlace converter 1209 in the center part, and outputs it to the output terminal 1220.

The I and Q signals are time-division multiplexed signals by the selector 1215 and are input to the SP converter 1216 to be eight parallel signals, which are matrix circuits 1217.
Entered in. Here, the same matrix operation as that for the luminance signal is performed. Three signals of the matrix circuit 1217 are input to the P-S converter 1218, become a serial signal, and are input to the interlace converter 1219 to be interlaced converted. Interlaced I, Q
The signal is output to the output terminal 1221.

FIG. 9 shows a decoder for decoding the image signal transmitted as described above into a wide aspect signal. A luminance signal Y is input to the input terminal 1301 and I and Q signals are input to the input terminal 1302. Luminance signal Y
Is input to the selector 1302 and is divided into a signal of the center portion and a signal of the upper and lower non-image portions. The center portion is input to the double speed converter 1303 and is sequentially converted into a scanning signal, and is input to the SP converter 1307 to be converted from one signal to three signals. The output of the SP converter 1307 is input to the inverse matrix circuit 1309. The signals of the upper and lower non-image portions are input to the rearrangement circuit 1304, rearranged by the processing opposite to that on the sending side, and input to the 5 × expansion circuit 1305. 5
The output of the double decompression circuit 1305 is double-speed converted by the double speed converter 1306, input to the SP converter 1308, converted into one to five signals, and then the inverse matrix circuit 130.
9 is input. The eight signals input to the inverse matrix circuit 1309 are subjected to the matrix operation opposite to that on the sending side, and input to the PS converter 1310. As a result, a wide aspect signal is obtained from the PS converter 1310. On the other hand, I input to the input terminal 1311,
The Q signal is input to the double speed converter 1312, double speed converted, and then input to the SP converter 1313. The parallel-converted signal is input to the inverse matrix circuit 1314 and inversely converted in the same manner as the luminance signal. Since three signals are input here, zero signals are used for the remaining five signals, for example. The signal obtained from the inverse matrix circuit 1314 is input to the PS converter 1315. As a result, I and Q signals for wide aspect signals are obtained, but they are time-division multiplexed as processed on the transmitting side. So the output of this converter is. It is input to the selector 1316, separated, and input to the D / A converter 1317. A luminance signal from the PS converter 1310 is also input to the D / A converter 1317. The luminance signal, I and Q signals output from the D / A converter 1317 are the inverse matrix circuit 131.
8 and is converted into R, G and B signals, and the respective signals are led to output terminals 1319, 1320 and 1321.

[0010]

In the above letterbox system, a 480 [TV book] signal can be reproduced, but the horizontal band of the vertical high frequency component is 0.8 MHz.
Is insufficient because it is limited to Furthermore, since the horizontal high frequency component is not transmitted, the horizontal band is 4.2 MHz.
There is only z, which is also insufficient.

Therefore, it is an object of the present invention to provide a multiple signal transmission apparatus capable of transmitting a large amount of vertical and horizontal high frequency component information and further achieving higher resolution.

[0012]

According to the present invention, the means for limiting the spectrum in accordance with the movement of the image and the vertical high-frequency component of the band-limited signal are used in the case of a still image and the case of a moving image. It has means for mixing the signals according to the movement and multiplexing them to the upper and lower non-image parts, and means for multiplexing the horizontal high frequency components to the portions of the upper and lower masks where the vertical components are not multiplexed.

[0013]

According to the above means, it is possible to limit the spectrum in accordance with the movement and to give a margin area in the transmission area. The vertical high frequency component and the horizontal high frequency component of the band limited signal are not vertically moved. Since it is multiplexed in the image portion, vertical and horizontal wide band information can be easily transmitted by effectively utilizing the upper and lower non-image portions.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit block of an encoder in one embodiment of the present invention, and FIG. 2 is a decoder. 3 and 4 show the circuit configuration and signal spectrum of each part of the encoder and decoder.

The encoder shown in FIG. 1 will be described first. To the input terminal 101, 480 effective scanning lines and the luminance signal Y for sequential scanning are input, and to the input terminal 102, the effective scanning lines 480.
A color signal C for main scanning and sequential scanning is input.

The luminance signal Y is a vertical low pass filter (V
It is input to the LPF) 103 and the subtractor 104. VLPF
103 limits the bandwidth below 360 [TV books],
The output is supplied to the subtractor 104 and the 4-3 converter 105. The subtractor 104 is 480
Since the component of [TV book] is subtracted from the component of [TV book], the vertical high frequency component of 360 to 480 [TV book] is output as the output. This component is a vertical high frequency component (hereinafter referred to as Vh signal) in the still image mode, and is used when reproducing high resolution on the decoder side. The Vh signal is input to the vertical shift circuit 106.

In the vertical shift circuit 106, 360 to 48
The 0 [television book] signal undergoes line inversion and is frequency-shifted to the vertical low band, and is output as a 0 to 120 [television book] signal. The output of the vertical shift circuit 106 is 4-
It is input to the 3 converter 107. 4-3 converter 105, 1
In 07, the signals of 480 effective scanning lines are respectively compressed 3/4 times in the vertical direction so as to become the signals of 360 effective scanning lines.

The output of the 4-3 converter 105 is a signal of 360 effective scanning lines and a vertical band of 360 [television book],
This is the signal for the main panel. 4-3 converter 105
Is output to the still image processing unit 108, the moving image processing unit 109, and the motion detection unit 110.

The still image processing unit 108 performs band limitation in the case of a still image and outputs it. This is input to the mixer 111 as a signal in the case of a still image on the main panel. Here, the configuration of the still image processing unit 108 will be described with reference to FIG. The signal is input from the terminal 301 and then input to the frame memory 302 and the adder 303. Frame memory 3
In 02, the signal is input to the adder 303 after being delayed by 1/60 seconds. The adder 303 obtains the sum of the frames. The output of the adder 303 is input to the coefficient unit 304, multiplied by 1/2 and output. The output of the coefficient unit 304 is input to the frame memory 305 and the selector 306. In the frame memory 305, a 1/60 second delay is performed and the result is input to the selector 306. In the selector 306, the outputs of the coefficient unit 304 and the frame memory 305 are 1 /
The output is switched every 60 seconds. Selector 306
Output is led to the terminal 307, and this signal is sent to the still image processing unit 1
The output is 08. The three-dimensional spectrum output from the still image processing unit 108 has a shape as shown in FIG. That is, the vertical band is limited to 360 [TV books], the temporal direction is 15 Hz, and the horizontal band is 6.0 MHz.

In the moving image processing unit 109, the band in the case of a moving image is limited and outputted. When this output is a moving image, it is input to the mixer 111 as a main panel signal.
The Vt signal, which is a vertical high frequency component in the case of a moving image, is also extracted from the moving image processing unit 109 and input to the mixer 113. Here, the configuration of the moving image processing unit 109 will be described with reference to FIG. The input signal is input via terminal 501 to 180
[TV book] The following components are input to the VLPF 502 for extracting the following components and also input to the subtractor 503. VLPF
The output of 502 is input to the subtractor 503 and
It is input to the delay device 504. The subtractor 503 is 180
[TV book] The following components are subtracted from the components of 360 [TV book], so that high-frequency components of 180 [TV book] to 360 [TV book] are obtained as the output. This high frequency component is input to the frame memory 505 and the adder 506. In the frame memory 505, 1/60 second delay is performed, and its output is input to the adder 506. In the adder 506, the sum between the frames is obtained, and the output thereof is input to the coefficient unit 507 which performs 1/2 calculation to obtain the average. The output of the coefficient unit 507 is the frame memory 5
08, and input to the selector 509. Frame memory 5
08 delays 1/60 seconds and outputs its output to the selector 50.
Enter in 9. The selector 509 switches the output of the coefficient unit 507 and the output of the frame memory 508 every 1/60 seconds and outputs the output. The output of the selector 509 is input to the LPF 510 that limits the band to 2 MHz or less in the horizontal direction. The output of the LPF 510 is led to the terminal 511 and also input to the adder 512. The signal output from the terminal 511 is the Vt signal input to the mixer 113.

The output of the VLPF 502 is input to the adder 512 via a delay device 504 provided for time adjustment. In the adder 512, signals of 180 [TV books] or less and 180 to 3 limited to 2 MHz or less
The signal of 60 [television book] is added to the output terminal 513. When this signal is a moving image, it is the signal of the main panel and is input to the mixer 111. This video processing unit 1
The three-dimensional spectrum of the output of the 08 movie is shown in FIG.
It becomes like. The components below 180 [TV book] are VLPs
Output of F502, 180-360 [TV book]
Since the component whose band is limited to 2 MHz or less is subjected to interframe processing, the temporal direction is also limited to 15 Hz or less. The output of the 4-3 converter 107 is input to the motion detection unit 110 and the Vh processing unit 112. Vh processing unit 1
At 12, band limitation of the Vh signal is performed.

The structure of the Vh processing section 112 will be described with reference to FIG. The signal input from the input terminal 701 is
VLPF that limits vertical band to 120 [TV book] or less
702 is input. The output of the VLPF 702 is input to the frame memory 703 and the adder 704. In the frame memory 703, 1/60 second delay is performed, and its output is input to the adder 704. The adder 704 calculates the sum between the frames. The output of the adder 704 is input to the coefficient unit 705, multiplied by 1/2, and output. The output of the coefficient unit 705 is the frame memory 706 and the selector 70.
Input to 7. The selector 707 inputs the outputs of the coefficient unit 705 and the frame memory 706, and switches and outputs them every 1/60 seconds. The output of the selector 707 is 2
It is input to the LPF 708 that limits the band below MHz.
The output of the LPF 708 is led to the terminal 709, and this is input to the mixer 113 as a Vh signal. Therefore Vh
The signal is shifted to the vertical low band by the vertical shift circuit 106, compressed by the 4-3 converter 107, and the Vh processing unit 112.
, The temporal direction is limited to 15 Hz, and the horizontal direction is limited to 2 MHz or less.

The motion detector 110 includes a 4-3 converter 10
The signal of the main panel from 5 and the Vh signal (signal before Vh processing) from the 4-3 converter 107 are input. The motion detector 110 detects the motion of the image and obtains a motion detection signal. The motion detection signal is obtained from the mixers 111 and 1 described above.
13 is input to the control end.

In the mixer 111, the still image system signal from the still image processing unit 108 and the moving image system signal from the moving image processing unit 109 are mixed and output at a mixing ratio determined by the motion detection signal. . In the case of a still image, a still image system signal output from the still image processing unit 108 is derived, and in the case of a moving image, a moving image system signal output from the moving image processing unit 109 is derived. The output of the mixer 111 is the signal of the main panel, is input to the interlace converter 114, and is converted into an interlace signal.

In the mixer 113, the Vh signal from the Vh processing unit 112 and the Vt signal from the moving image processing unit 109 are
It is mixed and output at a mixing ratio determined by the motion detection signal. The Vh signal output from the Vh processing unit 112 is derived for a still image, and the moving image processing unit 10 for a moving image.
The Vt signal output from 9 is derived. This mixer 1
The output of 13 is a Vh / Vt signal that is multiplexed in the upper and lower non-image parts, and is input to the interlace converter 115 to be interlaced. Interlace converter 114, 1
In FIG. 15, a progressive scanning signal having 360 effective scanning lines is converted into an interlaced signal.

The main panel signal output from the interlace converter 114 is input to the LPF 116 that limits the band to 4.2 MHz and the subtractor 117. The output of the LPF 116 is input to the subtractor 117 and the NTSC converter 118.
Since the subtracter 117 subtracts the signal whose band is limited to 4.7 MHz from the signal whose band is not limited,
The component above 4.2MHz is obtained. This signal is a horizontal high frequency component and is called an Hh signal. The Hh signal is
The signal is input to the Hh signal processing unit 119, is band-limited, and is output. The Hh signal from the Hh signal processing 119 is input to the rearrangement processing unit 120.

The configuration of the Hh signal processing unit 119 is shown in FIG.
Will be described. The Hh signal introduced to the terminal 801 is a VLP that limits the vertical band to 60 [TV book] or less.
Input to F802. The output of the VLPF 802 is input to the frame memory 803 and the adder 804. In the adder 804, the inter-frame sum is obtained, and the output thereof is input to the coefficient unit 805 and is halved. The output of the coefficient unit 805 is input to the frame memory 806 and the selector 807. In the frame memory 806, 1/60 second delay is performed and its output is input to the selector 807. In the selector 807, the coefficient unit 805 and the output of the frame memory 807 are switched every 1/60 seconds and derived. The output of the selector 807 is input to the frequency shift circuit 808 and frequency-shifted to 0 to 2 MHz. The output of the frequency shift circuit 808 is led to the terminal 809, which is Hh.
It becomes the output Hh signal of the signal processing unit 119 and is input to the rearrangement processing unit 120.

The output of the interlace converter 115 is also input to the rearrangement processing unit 120. The rearrangement processing unit 120 rearranges the input Hh signal and Vh / Vt signal so that they can be multiplexed in the upper and lower non-image portions. The output of the rearrangement processing unit 120 is the selector 12
Input to 1.

The configuration of the rearrangement processing unit 120 is shown in FIG.
Will be described. The Vh / Vt signal is input to the terminal 901, and the Hh signal is input to the terminal 902. Vh /
Both the Vt signal and the Hh signal are signals of 0 to 2 MHz, and are input to the 1/2 hour compressors 903 and 904, respectively, and are 1/2 time compressed. Then the signal band is 0 to
It becomes 4MHz. Since the vertical band of the Vh / Vt signal is 180 [television books], the 2-1 converter 905 may convert the number of effective scanning lines from 360 to 180. Further, since the vertical band of the Hh signal is 60 [television book], the effective scanning line number is set to 36 in the 6-1 converter 906.
You may convert from 0 to 60 lines. 2-1 converter 9
The outputs of 05 and the 6-1 converter 906 are both input to the rearrangement circuit 907. The signals input to the rearrangement circuit 907 are 180 and 60 signals, which are further compressed by ½ time.
7, the signals are rearranged and output as 120 signals. The 120 signal outputs of the rearrangement circuit 907 are input to the selector 121 via the terminal 908,
Here, they are selected and multiplexed in the periods of the upper and lower non-image portions.

The number of effective scanning lines is 48 from the input terminal 102.
Zero progressive scan C signals are input, and the band is limited to 180 [television lines] or less in the VLPF 122. VL
The output of the PF 122 is input to the 4-3 converter 123 and converted from 480 effective scanning lines to 360 effective scanning lines. This conversion output is input to the interlace converter 124, and converted from the progressive scan to the interlace signal. The output of the interlace converter 124 is delayed by the delay device 125 to match the delay amount with the Y signal, and then delayed by the NTS.
It is input to the C converter 118.

The NTSC converter 118 encodes the input Y signal and C signal into an NTSC signal. The NTSC signal is input to the selector 121 as a main panel signal. The selector 121 selectively derives the upper / lower non-picture section multiplex signal from the rearrangement circuit 120 and the main panel signal from the NTSC converter 118, and outputs the upper / lower mask multiplex signal at the upper and lower end portions of the screen. , Select and derive the main panel signal in the center of the screen,
Output to the output terminal 126.

By using the method described above, in the case of a moving image, a signal in the band shown in FIG. 5 (b) can be transmitted, and in the case of a still image, as shown in FIG. 5 (c). It is possible to transmit signals in various bands. Further, in FIG. 7A, of the signals in the above bands, the bands multiplexed in the non-image portion are indicated by the leading arrow lines. The configuration of the decoder shown in FIG. 2 will be described.

The input signal is input to the divider 202 via the terminal 201. In the divider 202, the main panel signal and the Hh signal and Vh signal multiplexed in the upper and lower non-image parts
The three types of / Vt signals are divided and derived. The main panel signal is input to the Y / C separation circuit 203, and the Hh signal is H
h is input to the signal processing unit 204, and the Vh / Vt signal is Vh
/ Vt signal processing unit 205.

The Y / C separation circuit 203 separates the luminance signal Y and the color signal C. The Y signal is input to the adder 206, and the C signal is input to the delay device 221. In the Hh signal processing unit 204, processing for rearranging the Hh signals into the original array is performed, the frequency-shifted signal is returned to the original value, and the scanning line conversion into 60 lines is performed.
The process of returning to the book is performed, and this signal is input to the adder 206 and is combined with the Y signal. The output of the adder 206 is input to the progressive scan converter 207 and converted into progressive scan. The output of the progressive scan converter 207 is the still image processing unit 20.
8, input to the moving image processing unit 209 and the motion detection unit 210.

The still image processing unit 208 performs signal processing in the case of a still image, and its output is input to the mixer 211 as a Y signal. The moving image processing unit 209 performs signal processing for a moving image, and the output thereof is input to the adder 212.

In the Vh / Vt processing section 205, Vh / Vt
The signals are rearranged from the state in which they are multiplexed in the upper and lower non-image parts, and further converted into a signal having 360 effective scanning lines and output. The output of the Vh / Vt signal processing unit 205 is input to the progressive scan converter 213. Progressive scan converter 213
Is the output of. The Vt signal processing unit 214, the motion detecting unit 210,
It is input to the mixer 215.

The Vt signal processing unit 214 reproduces the Vt signal. The reproduced Vt signal is input to the adder 212 and added to the signal output from the moving image processing unit 209. The output of the adder 212 is input to the mixer 211.

The motion detector 210 includes a progressive scan converter 2
The main panel signal output from 07 and the Vh / Vt signal output from the progressive scan converter 213 are input,
The motion of the image is detected from these two inputs, and the motion detection signal is output. The motion detection signal from the motion detection unit 210 is input to the mixers 211 and 215 as a control signal.

In the mixer 211, the still image system signal output from the still image processing unit 208 and the moving image signal output from the adder 212 are determined by the motion detection signal from the motion detection unit 210. It is mixed and output according to the mixing ratio. In the case of a still image, the still image system signal output from the still image processing unit 208 is output, and in the case of a moving image, the moving image system signal output from the adder 212 is output. The output of the mixer 211 becomes a Y signal and is input to the 3-4 converter 216.

In the mixer 215, the progressive scan converter 213 is used.
The Vh / Vt signal from 0 and the 0 signal are detected by the motion detector 210.
The signals are mixed and output according to the mixing ratio determined by the motion detection signal from. Progressive scan converter 2 for still images
The Vh / VT signal output from 13 is output, and nothing is output during a moving image. That is, the mixer 215 outputs a signal only in the case of a still image, so that the output becomes the Vh signal. The Vh signal output from the mixer 215 is 3
-4 converter 217. 3-4 converter 216,
At 217, the input signal of 360 effective scanning lines is converted into a signal of 480 effective scanning lines and is output.

The Y signal output from the 3-4 converter 216 is input to the adder 218. The Vh signal output from the 3-4 converter 217 is input to the Vh signal processing unit 219 to reproduce the Vh signal. Vh signal processing unit 219
The Vh signal output from is input to the adder 218,
The Y signal from the 3-4 converter 216 is added. The Vh signal is output only in the case of a still image, so Vh here
Signal addition is also performed only in the case of still images. The output of the adder 218 is output to the terminal 220, which becomes the Y signal output of the decoder.

The C signal output from the Y / C separation circuit 203 is input to the delay device 221. In the delay device 221,
A delay is performed to match the delay amount with the Y signal. The C signal output from the delay device 221 is the progressive scan converter 2
22 is input. The progressive scan converter 222 converts the interlaced scan signal into a progressive scan signal. The output of the progressive scan converter 222 is input to the 3-4 converter 223 and converted into a signal having 480 effective scanning lines.
The output of the 3-4 converter 223 is connected to the terminal 224, which serves as the C signal output of the decoder. By performing the decoding process by the above method, it is possible to decode the signal in the band as shown in FIG.

In the embodiment described above, the Hh signal is
Horizontal 2MHz, vertical 60 [TV book], time 15Hz band signal, Vh / Vt signal is horizontal 2MHz, vertical 18
A signal of 0 [television book] and a time band of 15 Hz was used, and these signals were multiplexed on the upper and lower non-picture portions of 120 lines, but this is not necessarily the case.

Now, the band of the Hh signal is set to horizontal Ax [MHz],
Vertical Ay [TV book], time At [Hz], Vh / V
Assuming that the number of effective scanning lines in the upper and lower non-image areas is N, the bandwidth of the t signal is horizontal Bx [MHz], vertical By [television book], and time Bt [Hz], then Ax x Ay x At
These values may be determined so that Bx × By × Bt ≦ 4.2 × N × 15 (1) is satisfied.

Further, in order to make the horizontal resolution the same as the screen having the aspect ratio of 4: 3 on the screen having the aspect ratio of 16: 9, the horizontal band needs to be 5.6 MHz or more.
Therefore, the horizontal band Ax of the Hh signal is 5.6-4.2 =
It is desirable to set it to 1.4MHz or more. In order to set the vertical band for still images to 480 [TV book], the vertical band By of the Vh / Vt signal is N [TV book] because the vertical band of the main panel is (480-N) [TV book]. Book]
It is desired to be above.

Therefore, when Ax is 1.4 or more and By is N or more, the Hh signal and Vh / are set so as to satisfy the equation (1).
By determining the band of the Vt signal, it is possible to effectively use the upper and lower non-image portions, and it is possible to reproduce an image having sufficient characteristics.

[0048]

As described above, according to the present invention, since the vertical high-frequency component and the horizontal high-frequency component are multiplexed in the upper and lower non-image parts after the spectrum is restricted according to the motion, the upper and lower non-image parts are multiplexed. The parts can be effectively used, and the vertical and horizontal bands can be increased.

[Brief description of drawings]

FIG. 1 is a circuit block diagram showing an encoder according to an embodiment of the present invention.

FIG. 2 is a circuit block diagram showing a decoder according to an embodiment of the present invention.

FIG. 3 is a block diagram showing details of each part of the circuits of FIGS. 1 and 2 and an explanatory diagram of a signal spectrum.

FIG. 4 is a block diagram showing details of each part of the circuits of FIGS. 1 and 2 and an explanatory diagram of a signal spectrum.

FIG. 5 is an explanatory diagram of a three-dimensional spectrum of a transmission signal and a multiplex region on a screen according to the device of the present invention.

FIG. 6 is an explanatory diagram of a letterbox method.

FIG. 7 is an explanatory diagram of a vertical compression principle in the letterbox method.

FIG. 8 is a block diagram showing a letterbox encoder.

FIG. 9 is a block diagram showing a letterbox decoder.

[Explanation of symbols]

103 ... Vertical low pass filter (VLPF), 104 ...
Subtractor, 105, 107 ... 4-3 converter, 106 ... Vertical shift circuit, 108 ... Still image processing unit, 109 ... Moving image processing unit, 110 ... Motion detection unit, 111, 113 ... Mixer, 1
12 ... Vh processing unit, 114, 115 ... Interlace converter, 116 ... Horizontal low-pass filter (LPF), 11
7 ... Subtractor, 118 ... NTSC converter, 119 ... Hh processing unit, 120 ... Sorting unit, 121 ... Selector, 202
... Divider, 203 ... Y / C separation unit, 204 ... Hh processing unit, 205 ... Vh / Vt processing unit, 206 ... Adder, 20
7, 213 ... Progressive scan converter, 208 ... Still image processing unit, 2
09 ... Moving image processing unit, 210 ... Motion detection unit, 212 ... Adder, 214 ... Vt processing unit, 215 ... Mixer, 216, 2
17 ... 3-4 converter, 218 ... Adder, 219 ... Vh processing unit.

Claims (2)

[Claims] 1. A device for converting a first image signal for a screen longer than a screen by a current television signal into a second image signal reproducible by a receiver of a current system and transmitting the converted second image signal, The screen corresponding to the current method of the second image signal is a screen in which the first area serves as an image display portion and the second area serves as a non-image portion, and the first area has N effective scanning lines. In such a multiplex signal transmission device, means for switching the spectrum limitation according to the movement of the first image signal to convert it into a third image signal, and a first unit when the third image signal is a still image. Means for obtaining a fourth image signal (Vh signal) in which a vertical band equal to or more than N [television book] of the image signal of (1) is obtained, and N / 2 [of the first image signal when the third image signal is a moving image] TV book] The fifth image signal (V t signal), means for obtaining the sixth image signal by mixing the fourth image signal and the fifth image signal by motion detection, and the third image signal for the second image signal. Means for displaying in a first region of the image signal, means for obtaining a seventh image signal by vertical band limiting components above the horizontal band of the second image signal included in the third image signal, A multiplex signal transmission device comprising: means for multiplexing the sixth image signal and the seventh image signal in a second region of the second image signal. 2. A first image signal for a screen that is horizontally longer than the screen based on the current television signal is compressed in the vertical direction,
A device for converting into a second image signal that can be reproduced by a receiver of the current system and transmitting the second image signal. In a screen compatible with the current system of the second image signal, the first main area serves as an image display unit, and Is a screen in which the sub-region is a non-image part, and the first main region is a multiple signal transmission device in which N effective scanning lines are provided, and the three-dimensional spectral region of the first image signal is Limit,
In the case of a still image, means for extracting a vertical high-frequency component (Vh component) having a frequency higher than that of the display main region component of the second image signal, and limiting the three-dimensional spectral region of the display main region component, In the case of a still image, a means for taking out a still image display main region component whose time direction is limited, and a three-dimensional spectral region of the display main region component is limited, and in the case of a moving image, a moving image display main region component is taken out and its vertical A means for extracting a high frequency component (Vt component) and the Vt and Vh components are mixed according to the image movement, and Vh
The means for deriving the / Vt component, the still image display main area component and the moving image display main area component are mixed in accordance with the image movement, and the mixed display main area component is further restricted in the horizontal direction and stored in the transmission band. Means for extracting as a display main area component for transmission and arranging and outputting it in the main area of the second image signal; and a horizontal high frequency component (H
and a means for outputting the Vh / Vt component and the Hh component by arranging them so that they do not overlap each other in the sub-region of the second image signal and outputting them. Transmission equipment.