JPS59193673A - Television system having scanning line reference converter - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a data generator, at least one receiver, and a transmission channel or storage channel respectively arranged between the data generator and the data transmitter. The channel has a predetermined line frequency and a field or frame frequency dissipation, and the bandwidth of the signal generated by the data generator signal source at a predetermined scan m dispersion per field or frame period. More limited band 1? a scan line standard conversion circuit is provided in the data generator between the signal source and the channel, the scan line standard conversion circuit including a memory having different write and read speeds for providing time-base stretching to the signal generated at the signal source;
The number of scan lines per field period is reduced, and the data receiver is equipped with a scan line standard converter having a matched scan line standard converter circuit for reconversion caused by storage sections having different write and read speeds. This invention relates to a television system and a data generator and data receiver suitable therefor.

With respect to such television systems and in particular the transmission channels, the Philips Research Standards Conversion to Telephone Signals (5 standards)
nof a TV Signal with 625
11neS ]-njo avideophone
signal with 31 a 1ines)
” is disclosed in the paper.The paper states that the frame rate is 25 frames per second.

A television telephone standard is described with 818 lines per frame. This standard allows standard conversion from 625 to 318 or vice versa. Finally, it is noted that this scanline standard conversion is accomplished using two or three scanline memory shift registers with different write or read speeds. , Approximately half of the original scanning line is itself or a signal interpolated between rising and falling lines, and the scanning line period is expanded to approximately double due to time axis expansion and then transmitted.

The object of the invention is to provide high definition television suitable for example 525t625 or 81! ] To provide a television system with scan line standard conversion that is compatible with known television systems with non-standard television standards. The television system according to the invention is therefore such that the conversion circuit of the data generator generates a signal containing information for almost all of the number of scan lines of the signal source in a cycle of four field periods, and The conversion circuit of the receiver is characterized in that it includes a storage section having a storage capacity sufficient to store information corresponding to different writing and reading speeds and information for one field period.

A data generator suitable for use in a television system according to the invention also provides a data generator in which the converting circuit of the data generator includes at least two unique parts having variable write and read speeds. The present invention is characterized in that a signal containing information of almost all of the scanning lines of the signal source is generated in cycles of four fields.

Furthermore, a data receiver suitable for use in the television system according to the invention provides that the conversion circuit of the data receiver has different write and read speeds, each of which has a period of one field. It is characterized by having at least four storage units 1 with a capacity 11.

The invention will now be explained in more detail with reference to the drawings.

FIG. 1 shows one embodiment of a data generator suitable for use in the inventive television system.

In FIG. 1, reference numeral 1 designates a signal source which is coupled via a scan line standard conversion circuit 2 to each of the transmission or storage channels 3 of the data generator. Channel 3 may be a standardized black and white or color television transmission channel. The number of mH shown on channel 3 in the standard method using interlaced scanning is the number of lines in a television frame.
TH represents the scanning line period 2. For example, m is 525, 62
5 or 819. For example, the scanning line period is 625
Equal to or approximately equal to 64 μS in the heather or 525 method. In the standard system, scanning lines @mH are the number of two fields l, jJ periods forming a frame period. The field period TV is, for example, 16.66 or 20 ms in the 5257F or 625/819 systems, respectively. For example, the band 1%J of channel 3 is about 5 MHz.

For signal source 1, the number of scan lines 2 mH is indicated in terms of the frame period, and the scan line period is indicated as TH.

Frame period 2 The scanning lines per TV are an even number of 2 mH, and the signal source 1 operates in non-interlaced scanning. The signal source 1 can then be a television camera, a cine-television converter (telecine) or a video signal source of a different configuration. The signal change over time t is plotted in FIG. A synchronization signal SO is applied to the signal source 1. Signal SO
and SL, 'S2..., S8, which will now be explained, are schematically drawn in FIG. With the signal SO in Figure 2, the signal source under its control has a frame period of 2
TV information continuously scan line period HI H2Ll...
- Hzm is supplied, and television scanning lines with a number of scanning lines of 2 mH correspond to them. The specific configuration of the signal source 1 is not relevant to the essence of the present invention; the signal source 1 has a 2 mH scanning line with a frame period of 2 TV and a scanning line period of 1! It is only important to be able to supply the display screen with information relating to a non-interlaced image equal to -TH. The signal source I generates a signal with a bandwidth of up to 10 MHz, for example, and a signal of this magnitude results in a high definition television image on display. This signal cannot for example be transmitted or stored without special means on channel 3 with a bandwidth of up to 5 MB2. , 1st
The data generator shown in the figure is supplied together with the scanning line standard conversion circuit 2.

The conversion circuit 2 has an analog-to-digital converter (A/D) 4 connected to the output of the signal source 1.

The output of converter 4 is connected to the inputs of four storage units s, a+ 7 and 8 with different write and read speeds. These storage units may be, for example, serial shift 6 registers SR. The particular configuration of the storage sections 5, 617 and 8 is not inventive and may be, for example, in the form of a random access memory; It only needs to be an operable digital memory.

The information is written into the storage parts 5, 6.7 and 8 under the control of four respective switching circuits 9, IO, 11 and 12, and also four switching circuits 13.14.

15 and 16 can be read under control.

All switching circuits 9 to 16 have switch contacts T1 and T.
Although it is drawn as a mechanical switch with 2,
In reality, it is a reserved switching circuit.

Signals S1 to 88f are applied as switch signals to respective switching circuits 9 to 16. Two signal levels are shown in FIG. 2 for switch signals S1 to 88 at T1 and T2, these levels corresponding to the switching contacts that are shown simultaneously when interconnected.

Contacts T2 of switching circuits 9 to 16 are disconnected. When connected to these contacts, storage units 51617 and 8 are disabled for writing and reading.

Contacts Tl of switching circuits 9, 10, 11 and 12 are externally interconnected and a clock pulse signal having a clock pulse frequency of 2fO is applied. Simultaneously switching circuit 18.14
．． The contacts T1 of 15 and 16 are connected to each other in an external flA manner, and a clock pulse signal having a clock pulse frequency @fC is applied thereto. By controlling the respective clock pulse signals with frequency diagrams 2fC and fC, the writing speed in the recording units 5, 6.7 and 8 is twice the reading speed. The resulting signal at the recorder output is time-stretched by a factor of two and its bandwidth is halved.

The outputs of storage units 5, 6, 7 and 8 are connected to a digital-to-analog converter (D/A) 170, the output of which is connected to channel 8. If channel 8 is a digital signal processing channel rather than an analog signal processing channel, converter 17 is omitted.

The operating mode of conversion circuit 2 of FIG. 1 will be described in more detail with reference to signals 5O1SN to 88.

During the frame period 2TV shown in FIG. 2, the recording sections 5 and 6 are selectively put into the write mode once every four scanning line periods under the control of the switching signals S1 and 82. Scanning line H1
+ Information from H5, H9, etc. is written to the storage unit 5,
Information from the scanning lines Ha I H7, Hll, etc. is written to the storage section 6. The positions of switching circuits 9 to 16 in FIG. 1 relate to scanning line H1, for example.

In the next frame period after the frame period 2TV in FIG. 2, the scanning line H2 is activated under the control of switch signals S3 and 84.

Data such as H6 and HIO are written to the storage section 7, and data such as scanning lines H4, H8, H12 and the like are written to the storage section 8. At the same time, during the first half-field period TV of the frame period, the storage 5 is read out under the control of the signal S5, so that the subsequent scanning lines H1', H5'.

Data such as H9' appears in the output. Since the read speed is half and these scan lines occur in the scan line period TH,
A 10 mH scan line appears on the field period TV. Thereafter, in the next half of the frame period, the memory 6 is read out under the control of the signal S6, and the scanning lines H8', H following the output of the memory are read out.
Data such as 7' 9 H1l' appears. In the next frame period, the storages 7 and 8 are read out in a similar manner under the control of the signals S7 and S8 for the subsequent scanning line H2' 9
H6', HIO', etc., as well as H4', Hs'
, H12', etc. appear one after another in the storage output. At the same time, information is written to storage units 5 and 6. FIG. 2 shows successive scan lines 11 of the original image.

Related data from H2, )+13 to H2m (second
The signal SO) shown in the figure is 4TV (7)-y-
Le b-1 Jt2J, that is, the first field is H1'
, H5'..., the second field is Ha'tH7'...
・, the third field is) T2' t H6'...,
4th field Gi! (4', H8'... (indicated by signals S5, S6, S7 and S8 in FIG. 2) are valid Gs in the subsequent scan lines. This data flow is shown in 11 in FIG. and is further plotted as a function of time t in FIG.

Flow of data in (digital or) analog form11
is transmitted or stored on channel 8).

The time diagram shown in FIG. 4 relates to the embodiment of the inventive data receiver shown schematically in FIG. In FIG. 3, the channel 3 force S of FIG. 1 is shown again. Channel 8 is a scan line standard conversion circuit, via path 20, to twice the period of the interlaced field period TV, approximately JLT.
It is connected for reconversion to a display device suitable for high-definition display of (zm+1)H with a scanning line period of H. Compared to the standard scan line period TH, the high definition scan line period is precisely -'-TH. If a display device following the standard 2m+1 system is connected directly to channel 3 in Figure 3, data flow 1 in Figure 4 is standard.

Similar to the structure of the system, a stream of data is provided according to the standard system, but the display position is then the data associated with the original scan lines H1, R5, etc. and R3, R7, etc. of the first and second fields, respectively. and the respective data of the scanning lines H2, H6, etc. and H4, H8, etc. of the fourth field while being displayed according to the standard method.

This agreement is acceptable in all respects in terms of image quality in the case of the standard method. Therefore, the high definition television system according to the invention is compatible with standard television systems of lower quality.

In the scan line standard conversion circuit 20, the output of channel 8 is connected to the input of an analog-to-digital converter 22.

The output of the converter 22 is connected to a switching circuit 2 having six switching contacts.
It is connected to 8 contacts. The six contacts of the switching circuit 23 correspond to the six switching circuits 2 each having three switching contacts.
It is connected to switching contacts 4 to 29. The switch contacts of the switching circuit 24 are connected to a memory section SRI in the form of a shift register SR with different write and read speeds. The output of the storage section SRI is connected to a switching contact of the switching circuit 24, and the other switching contacts of the switching circuit 24 are not connected. Similarly, the switching circuits 25 to 29 are connected to the storage section SR2.
It is connected from to SR6. Storage part SRI to SR
The output is further connected to six switching contacts of a switching circuit 30, and the switch contacts are connected to a high-definition display device via a digital-to-analog converter 31. During this period, two of the six switching contacts of the switching circuit 30 are always connected to the converter 81 for only one scanning line period ↓TH, whose time diagram is shown in FIG. A data stream 12 is applied to the display device 21. In FIG. 4, the switching signals SRI to SR6 are plotted, which are connected to the storage section SR, which is also shown in FIG. It is related to (1).

The writing of information that occurs in the storage section SRI in FIG. 3 is indicated by an arrow at the first pulse of signals SRI to SR6 in FIG. This information writing H' is executed under the control of a clock pulse signal having a clock pulse frequency fc. This is then read at twice the speed (end pulse arrow)
, again written with a clock pulse frequency of about 2fC. After that, the reading equipment of the car was actually about 2 fO Clock Tsugurus j sardine wave number? be tested.

A single readout and readout occur only on the same line as shown in the figure.

R5 etc.). Approximately twice as high (X clock frequency 1 frequency is positive Ult G 12 m, + 1 fc).

Data σ) There is a field period TVI in Kaoire 11.
1 mH scanning! Numerical power ≦ High-definition display and related data ME ratio 12 is converted to a number of scanning lines of approximately mHG
is January et al. In Fig. 4, a data flow 111 is formed every 4 field cycles to form a data flow 2.
The combination of the data for the calculation is the arrow [indicated by D] that connects the 1st and 12th lines.

The switches 23 to 30 of the switching circuits 23 to 30 in FIG. 3 (the q position corresponds to the first field 1st period G for each period mentioned above).

Image of monthly scanning on the display device 21 shown in FIG. 8:
is created according to the data flow I2G of FIG.

Here, the data flow "24" scan lines H1, R8, etc.
It consists of 2, H4, etc., and is repeated until G.

The image of this interlaced scanning on the display by the display device a21 is expressed as %+ <1st
The non-interlaced scanning image obtained when the signal is taken directly from the signal source shown in the figure and displayed is also derived. For this conversion, the scanning line standard replacement circuit 2 shown in FIG. Furthermore, in the configuration shown in the figure, when the storage parts SRI to SR6 form a serial shift register SR as shown in FIG. 3G, a total of six unique parts are required. FIG. 5 shows the general valley of a data generator having an odd number of scan lines (2m+1 LH) which generates an interlaced video signal. In FIG. 11, R3 corresponding to the first field in line sequential order.

R5, etc. correspond to the second field, and GmaR2+I(
4, H6, etc. are plotted as a function of time t.

The signal source 40 is coupled to the transmission or signal storage channel G via a scanning line standard conversion circuit 41. 1 circuit 41
The signal source 40 is connected via an analog-to-digital converter 42 to storage units 48 and 44, which are written with a clock pulse frequency of about 21"C, as described with reference to FIG. The outputs of the memory FAs 43 and 44 are connected to channel 8 via a digital-to-analog converter 49. The switching circuits 45, 46, 47 and 48 provide respective switch signals Sll, 312, S13 and S.
It operates under the control of 14, and its time diagram is plotted in FIG. Signals 311, S18, S12 in FIG.
The storage units 43 and 44 from S14 each have a capacity to store information for one scanning line period for the high-definition system, but cannot store the contents of a field period as required by circuit 2 in FIG. Therefore, two storage units as mentioned above will probably be used here again. Figure 6 shows the scanning lines sequentially H1+ H3+ H5, etc., then H2, H4,
H6, etc. are scan line sequential H1', Hs'.

H9'...(first field period), H2',
H6'.

H2O2... (second field period), Ha'
, H7'.

H1N'...(3rd field period), H4',
H8'.

The data stream I3D for channel 8 having [12'...(fourth field period) is converted. Data generator σ) case G to G conversion circuit 41 shown in FIG.
A signal is supplied within one field of the if4TV, and the data flow 18 is connected to the scanning line (2m+) of the signal source 40.
1) All but one of the H numbers are 0 or 0 switching circuit 45-. shown in FIG. At positions 46, 47 and 48, for example, a number The scanning line standard conversion circuit 20 shown in FIG. 3 is used, and at this time, the storage sections SR5 and SR6 do not need to be used or even need to be omitted from the beginning). In FIG. 7, the switch signals associated with the storage sections SRI, SR2, SR3 and SR4 of FIG. A preferred data flow process 4 for high-definition display on the display device 21 of FIG. 3 in the manner described in connection with FIG.
is converted to Furthermore, shift registering of the field period used for time axis compression f#, g(S S fj
is used, a conversion circuit 20 is obtained that includes at least four memory sections.

The display of the data stream 8 on the display screen of a standard display device consists of scan lines H3', H7', and H4.
', H8', scanning line H1' that matches the respective data
, H5', etc., with the original images contained in the respective data, such as H2', H6', etc., a display of the data flow T3 on the display screen of the standard display device is obtained. In this case acceptable image quality compatibility is also obtained.

Furthermore, in comparison to the standard number of scan lines mH per frame period, the number of scan lines 2mH and (2m+1)H was described as an example of high definition. There is also an example of using an even or odd number of scan lines equal to about 1.5 mH, in which case the data flow is scan line sequential OH1', H4'.

H7'... (first field), H2'pH5'tn
s'...(2nd field), Hl', ■4/
, H7/...(3rd field "), H3'
, H6', HLJ'... (fourth field °) and is transmitted to channel 3 and stored. In the display on the display screen of the standard display device, the scanning lines H2' and H5'
, H8', etc. and data such as Ha', H6', H9', etc. are 0 whose positions match.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating a first embodiment of a data generator suitable for use in a television set according to the present invention; FIG. FIG. 8 shows an embodiment of a data receiver suitable for use in conjunction with the data generator of FIG. 1; FIG. 4 shows the diagram of FIG. 2; FIG. 5 shows an alternative embodiment of a data generator, and FIG. 6 shows signal changes as a function of time to illustrate the operation of said data receiver. Figure 8r57 has the same configuration as that shown in Figure 8, but instead of six storage units, G
, : A diagram showing signal changes of a data receiver without four storage units.・1.40...Signal sources 2, 20, 41...Scanning line standard conversion circuit 3...
Channels 4, 22, 42...A/D converters 5, 6, 7
, 8 , 43 , 44 . . . storage section 9110 , 11
, 12, 13, 14, 15, l... switching circuit

Claims (1)

[Scope of Claims] L comprises a data generator, at least one data receiver, and a transmission channel or a storage channel respectively arranged between the data generator and the data receiver, the channel being With a predetermined line frequency and a field or frame frequency dispersion, the bandwidth is more limited than the bandwidth of the signal generated by the data generator signal source at a predetermined line frequency per field or frame period. A scan line standard conversion circuit is provided in the data generator between the signal source and the channel, and includes a memory section having different write and read speeds for providing time-base stretching to the signal generated at the signal source; To reduce the number of scan lines per field period, the data receiver is equipped with a scan line standard converter having a matched scan line standard converter circuit for reconversion caused by storage sections having different write and read speeds. In the television system, the conversion circuit of the data generator generates a signal containing information for almost all of the scanning lines of the signal source in a cycle of four fields, and The conversion circuit has different write and read speeds and 1
A television system equipped with a scanning line standard converter, characterized in that it includes a storage section having a capacity sufficient to store information corresponding to field period information. A television system according to claim 1, wherein the conversion circuit of the data receiver has at least four different write and read speeds, each having a storage capacity of one field period. A television system equipped with a scanning line standard converter, characterized in that it includes a storage unit. & In the television system according to any one of the first and second claims, when the signal source operates with the data generator having an even number of scanning lines for each frame period, the data generation A television equipped with a scanning line standard converter, characterized in that said conversion circuit of the device comprises six memory units 2 having different writing and reading speeds and each having a storage capacity of one field period. John method. In the television system according to any one of claims 1 to 8, the conversion circuit of the data generator includes at least two storage units having different writing and reading speeds. is characterized in that the television is equipped with a scanning line standard converter, which generates a signal containing information of substantially all of the scanning lines of the signal source in a cycle of the four-field period. method. In the television system according to claim 4, the conversion circuit of the data generator has different write and read speeds, each having a storage section 31 of one field period. A television system equipped with a scanning line standard converter characterized by & A television system according to any one of claims 1 to 3, wherein the conversion circuit of the data receiver has different write and read speeds, each of which has a period of one field. 1. A television system equipped with a scan line standard converter, characterized in that it includes at least four storage units having a storage capacity of . 7. Claim 6G In the television system according to the present invention, the conversion circuits of the data receiver have different write and read speeds, each having a storage capacity of one field period. A television system equipped with a scanning line standard converter characterized by including six storage units.