JPS5879390A - Television transmission and reception system - Google Patents

Abstract

PURPOSE:To obtain a high quality picture through the use of an existing broadcast equipment and a receiver, by transmitting a picked-up picture at the same time, with the provision of time shift and reproducing it at the receiver side. CONSTITUTION:An odd number line signal and an even number line signal of a camera output are shared to a line and a field memory side at each 1H with a switch S1. In selecting the S1 at the position as shown in the figure, the even number line signal of the 1st odd number field is applied to a field memory 4. At the next 1H, the odd number line signal of the same field is applied to the line memory. When switches S2, S3 are selected to the position as shown in the figure, the odd number line signal is written in the line memory 5. After the even number line signal is applied to a field memory 4 at the next 1H, the S2, S3 are switched at the next 1H and the odd number line signal written in the line memory 5 is read out in the speed of 1/2. In selecting a switch S4 as shown in the figure, then the odd number line signal is line-converted and given to a transmitter 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new television transmission and reception system that is compatible with current television broadcasting systems.

The current NTSC system is an interlaced scanning system with a field frequency of 60H1 and consists of 17 lines and 525 scanning lines, but in order to achieve even higher quality received images, various television broadcasts For example, the 1,125-broadcasting system that has been proposed would provide fine-grained images, but would require a wider band, and would require a new broadcasting band, which would require complete changes to the broadcasting equipment and receivers. Therefore, the problem is that the change in method is large-scale and takes time to realize.

SUMMARY OF THE INVENTION The present invention seeks to provide a new television transmission and reception system that is compatible with conventional television receivers and can be received by conventional television receivers. If the image is received by a high-quality receiver used in the present invention, the user can enjoy high-quality images.

In the current interlacing method, the number of scanning lines is 525, but the Kerr factor (K*rr factor) K
Since the real solution g1 degree of yaw has decreased by 30 to 40 degrees, if we use a non-interlaced scanning method without line @ 7 ripples, we can increase the vertical resolution by this amount compared to the conventional method. This allows you to obtain paintings with a calm and high quality feel.

However, with the traditional broadcasting system, field and
Although it is possible to use a double-scan non-interlaced method using memory, it has the drawback that it becomes discontinuous in the case of moving images and causes jagged edges, etc. In the present invention, it is possible to shift the captured images at the same time and send them at different times. Since it was played back at 5K on the receiver's side, it became possible to play back high-quality paintings without the above-mentioned drawbacks.

In addition, in the present invention, the number of frames per second is 60: f
Although it is 30 wK lower than that of Ma, there is almost no problem in practical use.

Hereinafter, the present invention will be specifically explained using the drawings.

1 and 2 are explanatory diagrams showing operations on the transmitting side.

In the present invention, the operations shown in the figure are performed on the camera side. That is, the horizontal deflection frequency is doubled to 2/i of the conventional horizontal deflection frequency fHK. Therefore, the camera signal band is 412 times larger (6), and one field is scanned twice as many times as 525 lines.At this time, the required band is doubled and cannot be passed through a conventional transmission line, so band compression must be performed. Therefore, frame-dropping is performed, in other words, the output from the camera is obtained continuously, but the two outputs from the camera are thinned out for each field.0 Figure shows an example in which even fields are thinned out and odd field signals are used. .

Each field is an odd scanning line (line) signal “1p”
l*bl*bs, """ and even line converter ag, a4
Sum of ゜bslb4*”””J 10mB, 184
, J + bs *, b, +b4. It shall consist of... Of each of these field signals,
Even field signal axis "4' e bs" b4
*... is not used at all.For odd field signals, odd line signal "1sbl" is used for l scanning line.
*..., put it in the twin memory as described below, and read it out at the writing speed of 14. In this way,
Twin conversion is performed (corresponds to 525/2 scanning lines)
compressed to normal bandwidth.

Odd field even line signal” 2 * bs e
...The river is put into field memory and read out after one field at a rate of % of the write speed. As a result, the transmitted output signal is the first one consisting of 112,572 odd line signals 11.
Field, the second field also consisting of the even line signal axis, the same odd line signal b! The third field consists of the same even-numbered line signals, and the fourth field consists of the same even number line signals.
...becomes a continuous sequence.

ζ Thus, the number of scanning lines per field is 525/2, and it is possible to obtain a conventional interlaced scanning signal in which two fields form one frame. Since this signal is no different from conventional signals, broadcasting equipment and receivers can be used in exactly the same way. In addition, if camera beam blanking is performed in the even field to be thinned out,
It is possible to almost double the camera sensitivity.

FIG. 3 is a pull diagram showing a specific example of a transmitting device for performing the above-described operation. In II, (1) is a television camera, and its horizontal deflection frequency 2/n and vertical deflection frequency /V are supplied from a synchronization signal generator (2). (3) is a clock generator that generates a memory write clock and a read clock. Therefore, when the write clock frequency is fR and the read clock frequency is fR, /R
='/W.

(4) + field to delay by 11 fields -) %, (5), (6) 411 scans! ! This is a line memory for delaying by (IH). 8th word 2f
At the frequency of H, 8 and 83 are the frequencies of fH, and S4 is a switch that operates at the frequency of 2 fv. (
7) and (8) are i frequency dividers, c(9) is a line converter, and Ql is a transmitter.

Odd line signals and even line signals of the camera output are divided into line memory side and field memory side pressure for each IH by a switch 81K. Now, when the switch 81 is in the position shown, the even line signal axis of the first odd field in Figures 1 and 2 is stored in the field memory (4).
Suppose K is added.

The next IHJC is the odd line signal a1 of the same field.
is added to the line memory side. At that time, Koichi B
Assuming that z and Ss are at the positions shown in the figure, the odd 2-in signal a
1 is written to twin memory (5)K.

The next IHK even-numbered signal smell is field mesori (4
), in the next IH, switch 8
m and 8m are switched, and the odd line signal written in the twin memory (5) K is read out at the speed of 1 or 4. At this time, if the switch S4 is set to the position shown in the figure, the odd line signal 11 is line-converted and sent to the °C transmitter al&c. The above-described operation is repeated, and when the switch 84 is in the position shown in the figure, the first field (525/2 lines, odor) in FIG. 1 is sent out.

After sending out the first field, the switch S4 is switched to the opposite position as shown in the figure, and the even line signal phantom stored in the field memo IJ(4)K is sent to the transmitter αIK via the twin converter (9). Here, the line converter (9) includes a switch 8s that performs line conversion of the odd line signal @1;
It has the same configuration as the circuit consisting of Sm and line memories (5) and (6). In this way, @2 field follows the 1st field.

(52,572 pieces) are sent out. Thereafter, the transmission output signal shown in FIG. 2 is sent out in the same manner.

A conventional transmitter section can be used.

FIG. 4' is a block diagram showing a specific example of a receiving device for receiving the above-mentioned transmission output signal, and FIG. 5 is an explanatory diagram of its operation. In Figure 4, aυ is a tuner,
a3 is a video intermediate frequency amplification circuit, (+3 is a video detection circuit, and sorption is a synchronous separation circuit, all of which are the same as the conventional ones. A transmitted output signal appears. In FIG. 5, this is used as an input signal for convenience. This input signal is applied to the field memory side and the line memory side. Field memory Q[9, αη and line memory (II,
(11&) This is the same as the one used for transmission.

In addition to the output /H, fV of the synchronization separation circuit I, the input voltage generator α stage, the memory write and read output voltage generator ht, j.
Make yh. In this case, KK1n-2f is reversed from that at the time of transmission.

Horizontal sync signal! 5 is set to 2/H by a frequency doubler and used as the horizontal deflection frequency of the receiver tube. 2-in memory (11,
as is 2 which is reversed at the time of transmission along with switch S@, 811.
5゜, that is, switch s6゜8ha /
It switches every IH at the frequency of H, and writes and reads alternately to and from the two line memories.

At this time, since the data is read out at twice the writing speed, it is converted into a signal of 525 double thumbnail scanning lines. Switch S- to 21
11, and take out one of the two-step signals as an output. On the other hand, the frequency is switched for each field at a twin-inch 5itT/V frequency, and writing and reading are performed alternately to and from the two field memories. However, for convenience of illustration, each field memory is
g, 8s, line e mesori al, al.

FIG. 4A shows the operating state when the received outputs of field 1 in FIG. 5 are combined. Assume that the writing of the field signal of K52572 to the field signal 9as has already been completed, and the switch 8g is in the position shown in the figure. At this time, the switch S1 is in the position shown in the figure, and the field memory αQ is read out.

Its output is a line-converted 525/2 line a1 field signal. At the same time, field-memory a71
K 525/2 field signals are written and twin converted 525 signals from the line memory are also written.
/2 field signals are output.

Therefore, the output signal taken out via switch 8- is
This results in 525 line-converted field signals (at+Q).

FIG. 4B shows the operating state of the main parts when combining the received outputs of field 2. Switch Si is switched to the position shown in the figure, and 52572 pieces of data are transferred to field memory aQ.
Write 1 field signal. During this time, the switch 87 switches at a frequency of /H, and at the same time continues to read out the field signal of the previous 525/2 line a1, the field signal a? ) is also read out the 7 field signal of 52572 pins 3. Therefore, the same 525
The field signal of the book (Maro!+al) is extracted. At this time, switch 8 to prevent the line/meeting from operating.
6. Temporarily stop the switching operation in 81.

When the above operations are repeated, even fields are thinned out from the camera output in FIG. Field 2. A television reception image signal consisting of... is obtained. When displaying this on a picture tube, the horizontal deflection frequency is set to 27
Let it be H.

The received image according to the present invention is a high-quality image with improved vertical resolution and no interlaced scan line roughness or line flicker. Further, according to the present invention, it is possible to provide a television transmission and reception system that does not require an increase in the required band, requires only changes to the camera process, and does not require major changes to conventional equipment, and is compatible. Therefore, although the received image is significantly improved by K, there is no frequency allocation problem and it is easy to migrate from the current system.

Although the above embodiment has been explained using the NTSC system as an example, the present invention can be applied to all current 2=1 interlace system televisions such as PAL and 8ECAM.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams showing operations on the transmitting side, FIG. 3 is a block diagram showing a specific example of the transmitting device, FIG. 4 is a block diagram showing a specific example of the receiving device, and FIG. 5 is its operation. FIG. (1-9, 81-84)... Transmitting means used in the present invention, (15-20, Ss-8-)... Receiving means used in the present invention.

Claims (1)

[Scope of Claims] 1. Reduces the number of scanning lines per field for Iij signal obtained at the same time and spreads over two fields. A television transmission/reception system characterized by increasing the number of scanning lines per field and using a 2-field image signal to display the same image in 1 field on a receiving screen over 2 fields. 2. Of the continuously obtained camera output, only the signals of every other field are line-converted and the number of scanning lines is reduced to 1/
! 5. The television transmitting and receiving system according to claim 1, wherein the transmission rate is reduced to 5Kt. 3. The television transmission/reception system according to claim 181, wherein the received signals spanning the two fields are 2-in converted and combined to double the number of scanning lines.