JPH02105687A - Television signal transmission method - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of multiplexing new signals while maintaining compatibility with current television.

[Prior art] As a new signal, consider a luminance signal (high-definition signal) that exceeds the current television band, and convert that signal into a time frequency f=
As for the method of multiplexing and transmitting on ±7.5Hz, there is a method using amplitude modulation, a method described in Japanese Patent Application No. 175829/1983, a method using sub-sampling,
A method using two-frame offset sampling exists.

[Problem to be solved by the invention] The vertical frequency (ν
)-time frequency (f) domain is as shown in FIG. The high-definition signal is a subcarrier μ having the vertical and temporal frequency shown in Figure 2. and the same component is modulated by f
=±7.5Hz is multiplexed on the shaded area.

This invention is! The aim is to effectively utilize the 5 Hz region and use amplitude modulation to multiplex and transmit more information.

[Means for Solving the Invention] When FIG. 2 is drawn in a three-dimensional frequency domain of horizontal, vertical, and temporal frequencies, it becomes as shown in FIG. 1. Considering the cross section at μ=μm, −μ, the same component occupies the four shaded areas. However, since multiplexed signals A and A' and multiplexed signals B and B' are located symmetrically with respect to the origin, they form a pair and transmit the same signal, but multiplexed signals A and 14 may transmit different signals. It is possible.

Therefore, by multiplexing multiplexed signals A and B using carrier waves μ^ and μB with vertical and temporal frequencies indicated by Δ and X in Fig. 2, twice as much information as before can be transmitted. be able to.

[Action] Let us now consider two diagrams of the transmitted wave μ^+/jB. As shown in Figure 3, the spectrum when moving to the left is μ−
In the f plane, the first . Exists in the 3rd quadrant, and the spectrum when moving to the right is the 2nd. It is known to exist in the fourth quadrant (for example, Takahiko Fukinuki, "Evaluating the characteristics of three-dimensional frequency processing using a moving circular zone plate in response to the development of television technology", Nikkei Electronics pp. 195-2)
18 (Julyko, 1985). Therefore, as shown in FIG. 4, the carrier wave μ^ marked with Δ in FIG. On the other hand, the carrier wave μB is a wave moving in the right direction.Since the regions of the multiplexed signals I and B are different regions, different signals can be inserted.

[Example] Hereinafter, an example will be shown in which various signals are multiplexed using the multiplexing method of the present invention. Signals to be multiplexed and 1. In order to realize high-definition component 2° wide aspect ratio television transmission that exceeds the signal band of the current digital television standard, both side site panel information that is not sent with the current television signal 3° receiver Examples include reinforcement signals that facilitate conversion from interlaced scanning to progressive scanning on the receiver side, and motion information that makes it possible to eliminate or simplify motion detection on the receiver side.

First, an example will be shown in which a 1° high-definition luminance signal is transmitted.

As shown in FIG. 5(a), 4.2-8. =j,,
The luminance high-definition signal component of MJ (z) is
, 1 to 4.2 MHz). Since two multiplexed regions are available as shown in Fig. 1, it is divided into Y) 11 of 4.2 to 6.3 MHz and Y112 of 6, 3 to 8, and 4 MHz. ), the horizontal frequency μΔ,
Using μB, the band inversion frequency is shifted to the region of 2.1 to 4.2 MHz, and Yr+1' and Yl(2' are multiplexed. At this time, the "vertical-time" frequency spectrum is the fifth The result will be as shown in figure (d).

An embodiment of the encoder at this time is shown in FIG.

First, extract the YHI region from the luminance signal using BPFI,
Extract the region of YH2 using B P F 2.

The phase control circuit 7 performs carrier suppression amplitude modulation on the carrier waves μ^ and μB having horizontal and temporal phases as shown in FIG. 4 in the modulator 3 with Yol and YH2, respectively.

By filtering the output with LPF4 and LPF5 that pass only the lower sideband, Y)+1'Y H2' is obtained. By adding the current television signal obtained through the color encoder 6 to this modulated signal in the multiplexing circuit 8, the desired high-definition television signal is obtained. Further, on the receiver side, signals such that the phase of the carrier wave can be detected are multiplexed, for example, during the vertical blanking period.

Next, an embodiment on the receiver side will be described using FIG. 7. Y
141' and Yl-+2' are extracted using the difference between two frames in which the phases of the modulated color difference signals match and the phase of μ^2μB is reversed. Therefore, 2 in yo' separation circuit 1o
By taking the difference between the frame delay circuit 9 output and the input signal, a Y u 1 ′ + Y u 2 ′ signal is obtained. By subtracting this output signal from the original signal in an adder 11, a normal composite signal is obtained.

In order to obtain MHI and YH2, first, the phase control circuit 19 calculates μ^ from the phase information multiplexed on the high-definition TV signal.
, Y)+1'+YI42' in μB as synchronous detection circuit 1
YHI of FIG. 5(b) and (c).

LPF 13. whose pass band is the position of Y u 2. LPF1
4 to filter the lower sidebands respectively. The "vertical-time" frequency spectrum of the signal demodulated by μ^ at this time is shown in FIG. The same is true for μB1. At this time, it is necessary to remove unnecessary components present at f=±15 Hz caused by demodulating multiplexed region B with μ^. Therefore, by calculating the frame sum using the frame delay circuit 15 and the adder 16, Y)+1. YO2 can be obtained. Finally, the composite signal is demodulated by the decoder circuit 17, and the desired signal is obtained by adding YHI and YO2 to the luminance signal output by the adder 18.

Here, as shown in FIG. 5(a), there are 2 multiplexed areas.
~4,2 MHz is used, but 0~4.2 MHz
It is also possible to transmit a total brightness band of 12.6 MHz by fully using up to 12.6 MHz.

In addition, when selecting the horizontal frequency of the carrier wave, in order to reduce interference to current receivers, the low range of high-definition signals, where energy is likely to be concentrated, is shifted to the high range of the current band, where it is difficult to see it as interference. The bands were inverted and multiplexed so that the To perform a parallel shift as is, μ
^=2. IMHz.

It is sufficient to set μB = 4 and 2 MHz. Also, M.H.
I.

It goes without saying that it is also possible to replace the multiplexed areas of Y)+2.

In addition, this method and the atrium ``high-definition TV with complete communication
It is also possible to use it in combination with the method described in "Proposal of a Method" (IEICE Technical Report C383-61, July 1983). Various methods can be considered for the purpose of expanding the bands of luminance signals and color difference signals. For example, the method shown in FIG. 9 can be considered. Furthermore, high-definition I and Q signals can be multiplexed into each region by dividing the signal into two in the vertical frequency direction and using a carrier wave on which different information is loaded (7.5). It is also possible to divide horizontally and multiplex different information.

Next, an example of 2° will be shown. The wide aspect 1 signal transmission method is, for example, 1M, A, 15nardi et.

al "Encoding for Compat
ability and recovery
y ihn the ACTV System” (I
EEE Trans, Broadcasting, B
C-33, Na4. Dec, 1987゜p, p, 1
16-123). There, in the current television signal, both side panel information that is not sent is time-stretched, modulated with a certain carrier wave, and multiplexed. Here, both side panels stretched for that time are multiplexed. Examples of multiplexing techniques are shown in FIGS. 11 and 12.

In the example shown in Figure 11, the left and right side panel brightness information is f=±
The frequency is multiplexed at 7.5 Hz, and the side panel color difference information is multiplexed in the one-dot line area.

Of course, it is also possible to multiplex the left and right side panel color difference information during horizontal and vertical blanking or overscan periods, and place high-definition information in the dotted line area. In the example shown in FIG. 12, the region of f=±7.5 Hz is divided into two in the vertical frequency direction, and left and right side panel luminance and color difference signals are multiplexed. Of course, the multiple positions can be swapped by
Needless to say. Furthermore, if it is desired to multiplex in the form of an NTSC composite signal, it is divided in the horizontal frequency direction and multiplexed. The frequency spectrum at that time is as shown in FIG. The basic configuration of the encoder and decoder is the 6th,
Since it is the same as Figure 7, it will be omitted.

Finally, an example of 3° is shown. Interlaced scanning on the receiver side
As a reinforcement signal for progressive scan conversion, the above-mentioned document "E"
coding for Compatibility
andRecoverability in the
ACTV System”
-T He1per signal is mentioned.

This is done by fixing the interlaced scan to progressive scan conversion on the receiver to interpolation between frames, creating exactly the same signal as the receiver on the transmitting side, and comparing the difference with the original signal (assuming that a progressive scan camera is used). It is intended to transmit. Further, as the motion information, Japanese Patent Application No. 114503/1984 can be cited. These signals are multiplexed into the area defined in the claims. The spectrum at that time is as shown in FIG.

Here, we have described the case of f=±7.5Hz, but
This method can be applied to time frequencies other than f=o and ±15 Hz. If f=±15 Hz, this cannot be realized because of loopback due to interlaced scanning. Also, the multiplexed signal is S
Either SB or DSB may be used. Needless to say,
This method uses color television signals (NTSC, PAL)
, SECAM), or monochrome television signals.

Although not described in detail, when multiplexing at f=±7.5Hz due to folding due to the interlaced scanning structure,
This component is also multiplexed at f=±22.5Hz c
When two signals with up to ph are multiplexed, f=±
It is not possible to multiplex signals to 22.5Hz.

Here, the spectrum of the PAL system is shown in FIG. f
Another signal is multiplexed at =±7.5Hz, and this is to invert the polarity of the {circle around (2)} component alternately in each line in order to reduce phase distortion of the color signal. Therefore, processing such as calculating the line sum is performed on the receiver side. Therefore, the PAL system is.

The present invention, which aims to use the frequency domain effectively, is different. Looking at FIG. 14, since the 1st and 3rd quadrants are empty, it is clear that the method described in 16 can be used in this area.

[Effects of the Invention] The present invention is based on the fact that only (-μ, -9.-1) is bare with the three-dimensional frequency (μ, v, f); f) and (μ, ν.

-J) allows for multiplexing of other signals.

This has made it possible to multiplex twice as much information as before onto a single time frequency.

By using this method, it becomes possible to transmit high-definition luminance and color difference signals, transmit side panel information for wide aspect ratio 1 to 1, and transmit motion information.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the present invention in a three-dimensional frequency domain. FIG. 2 is an explanatory diagram of a conventional example. The third and fourth illustrations are explanatory diagrams of carrier waves that implement the present invention. FIG. 5 is an explanatory diagram when the present invention is used to transmit high-definition information, and FIGS. 6 and 7 are encoders at that time. This is an example of the configuration of a decoder. FIG. 8 is an explanatory diagram of the process shown in FIG. 7. Figures 9 and 10 show another embodiment of high-definition information transmission using the present invention, and Figure 11-212.1.3 shows
Embodiment of side panel information transmission in wide asperity vector 1 FIG. 14 is an embodiment of motion information transmission. FIG. 15 is a frequency spectrum of the PAL system. 1...BPF, 2...BPF, 3...Modulator, 4
...LPF, 5...LPF, 6...Color encoder, 7...Phase control circuit, 8...Multiple circuit, 9...
...2 frame delay circuit, 10...Yl ('separation circuit, 11...adder, 12...synchronous detection circuit, 13...
...LPF, 14...LPF, 15...Frame delay circuit, 16...Adder, 17...Decoder circuit, 1
8... Adder, 19... Phase control circuit. fan/circle

Claims (1)

[Claims] Three-dimensional frequency domain (μ, ν, f) (μ: horizontal frequency, ν
: vertical frequency, f: temporal frequency), a certain temporal frequency ±f_0 (excluding 0, ±15Hz, e.g. 7.5H
When multiplexing a new signal in the area of z) onto the current television signal by amplitude modulation, f=f_0, f=-f_0
A television signal transmission method characterized by multiplexing different signals on a plane.