JPS6397085A - Transmitting device for high definition television signal - Google Patents
Transmitting device for high definition television signalInfo
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- JPS6397085A JPS6397085A JP61242608A JP24260886A JPS6397085A JP S6397085 A JPS6397085 A JP S6397085A JP 61242608 A JP61242608 A JP 61242608A JP 24260886 A JP24260886 A JP 24260886A JP S6397085 A JPS6397085 A JP S6397085A
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- 230000008054 signal transmission Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 abstract description 14
- 238000010586 diagram Methods 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 7
- 238000001228 spectrum Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
- 101150118300 cos gene Proteins 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 101100234408 Danio rerio kif7 gene Proteins 0.000 description 1
- 101100221620 Drosophila melanogaster cos gene Proteins 0.000 description 1
- 101100398237 Xenopus tropicalis kif11 gene Proteins 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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- 239000000284 extract Substances 0.000 description 1
- 238000012966 insertion method Methods 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、現行のＮＴＳＣ方式と交信性を有する高精
細テレビシロン信号伝送方式で高精細色信号の多重方式
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-definition color signal multiplexing system in a high-definition television signal transmission system having communication characteristics with the current NTSC system.
現行のテレビジョン信号（ＮＴＳＣ）と完全交信性を有
するテレビジョンの高精細信号多重方式がいくつか提案
されている。第３図は例えば電子通信学会、技術研究報
告Ｃ３８３−６１ｒ完全交信性を有する高精ＩＩＴＶ方
式の提案」 （昭和５８年７月２９日）で述べられてい
る高精細信号多重方式による従来の高精細情報挿入回路
の例であり、第４図は同様に高精細情報再生回路の例で
ある。Several high-definition television signal multiplexing systems that are fully compatible with current television signals (NTSC) have been proposed. Figure 3 shows, for example, the conventional high-definition signal multiplexing system based on the high-definition signal multiplexing system described in Technical Research Report C383-61r, "Proposal of a high-definition IITV system with complete communication" (July 29, 1982) published by the Institute of Electronics and Communication Engineers. This is an example of a high-definition information insertion circuit, and FIG. 4 is an example of a high-definition information reproducing circuit.
第３図において、Ｙ＋ＹＨは高域成分を含んだ輝度信号
、Ｉ、Ｑは色差信号、ｆｓｃは色副搬送波であり、輝度
信号Ｙ及び色差信号１． ＱはＮＴＳＣエンコーダ１３
に入力され、ＮＴＳＣ信号に変換される。また輝度信号
Ｙ＋ＹＨは、高域フィルタ３６に入力されて高精細輝度
信号ＹＨが分離され、変調器３７に入力される。この変
調器３７は、色副搬送波ｆｓｃを分周器３９で周波数を
ｚしたものを移相器１８とスイッチＳによりフィールド
毎に反転し、これを搬送波としている。変調器３７の出
力は帯域フィルタ３８に入力され、周波数シフトした高
精細輝度信号ＹＨ’が抽出される。このＹＨ’ と前記
ＮＴＳＣエンコーダ１３の出力とは加算器１４により合
成され、伝送信号ＮＴＳＣ″が得られる。In FIG. 3, Y+YH is a luminance signal containing high-frequency components, I and Q are color difference signals, fsc is a color subcarrier, and luminance signal Y and color difference signals 1. Q is NTSC encoder 13
and is converted to an NTSC signal. Further, the luminance signal Y+YH is input to a high-pass filter 36 to separate a high-definition luminance signal YH, which is input to a modulator 37. This modulator 37 uses a color subcarrier fsc whose frequency is z by a frequency divider 39 and inverts it for each field by a phase shifter 18 and a switch S, and uses this as a carrier wave. The output of the modulator 37 is input to a bandpass filter 38, and a frequency-shifted high-definition luminance signal YH' is extracted. This YH' and the output of the NTSC encoder 13 are combined by an adder 14 to obtain a transmission signal NTSC''.
一方受信側では、第４図に示す様に伝送されてきたＮＴ
ＳＣ’信号は時空間フィルタ２０に入力され、周波数シ
フトされた高精細輝度信号ＹＨ″が抽出される。そして
この信号ＹＨ’ は復調器３６に入力され、その出力は
高域フィルタ３７に入力されて高精細輝度信号ＹＨが再
生される。一方、伝送信号ＮＴＳＣ’より前記時空間フ
ィルタ２０の出力を滅罪器２工により差引いてＮＴＳＣ
信号を得る。このＮＴＳＣ信号は、ＮＴＳＣデコーダ２
８によって輝度信号Ｙと色差信号ｒ、 Ｑに分離され、
輝度信号Ｙに前記高精細輝度信号ＹＨを加算器３８によ
って加算し、再生輝度信号Ｙ＋ＹＨが再生される。On the other hand, on the receiving side, as shown in Figure 4, the transmitted NT
The SC' signal is input to the spatiotemporal filter 20, and a frequency-shifted high-definition luminance signal YH'' is extracted. This signal YH' is then input to the demodulator 36, and its output is input to the high-pass filter 37. On the other hand, the output of the spatio-temporal filter 20 is subtracted from the transmission signal NTSC' by a decimator 2 to reproduce the NTSC signal YH.
Get a signal. This NTSC signal is sent to the NTSC decoder 2.
8 into a luminance signal Y and color difference signals r and Q,
The high-definition luminance signal YH is added to the luminance signal Y by an adder 38 to reproduce a reproduced luminance signal Y+YH.
次に゛動作について説明する。第５図で横軸は時間周波
数ｆ、縦軸は垂直方向の空間周波数νを示し、図中Ｃは
色信号成分である。図から明らかなように現行ＮＴＳＣ
方式では第１象限と第３象限とが空いており、ここに高
精細輝度信号Ｙ Ｈを周波数シフトして挿入する。第６
図はこの周波数シフトを示しており、輝度信号の高域成
分（４〜６ＭＨｚ ）を色副搬送周波数ｆｓｃの％の周
波数の搬送波で振幅変調することによって、２．２〜４
．２ＭＨｚに周波数シフトを行なう。いまＹＨの信号を
ＥＨ（ｔｌとすると、
Ｅ Ｈ’ （ｔｌ ＝ Ｅ Ｈ（ｔ）・ｃｏｓ２πｆｃ
ｔ ・・・■簡単のためＥ Ｈ（ｔｌを周波
数ｆＨの正弦波と仮定すると
Ｅ Ｈ’ （ｔ）＝ｃｏｓ （２πｆＨｔ十 ψ
） ・ ｃｏｓ２ ｙｒ ｆｃｔ＝ ２ ［ｃｏｓ
（２ｙｒ（ｆｃ＋ｆＨ）ｔ＋ψ）４ ｃｏｓ（２π（
ｆｃ−ｆＨ）ｔ 十ψ） ］・・・■
と表わせる。これより下側波帯をとることによっつ低域
へ周波数シフトすることができる。Next, the operation will be explained. In FIG. 5, the horizontal axis shows the temporal frequency f, the vertical axis shows the vertical spatial frequency ν, and C in the figure is the color signal component. As is clear from the figure, the current NTSC
In this method, the first and third quadrants are vacant, and the high-definition luminance signal YH is frequency-shifted and inserted into these quadrants. 6th
The figure shows this frequency shift, and by amplitude modulating the high-frequency component (4 to 6 MHz) of the luminance signal with a carrier wave whose frequency is % of the color subcarrier frequency fsc, the frequency shift is 2.2 to 4 MHz.
．． Frequency shift to 2MHz. Now, if the signal of YH is EH (tl), E H' (tl = E H(t)・cos2πfc
t ... ■For simplicity, E H (assuming tl is a sine wave with frequency fH, E H' (t) = cos (2πfHt + ψ
) ・ cos2 yr fct= 2 [cos
(2yr(fc+fH)t+ψ)4 cos(2π(
It can be expressed as fc−fH)t ψ) ]...■. By taking a sideband below this, it is possible to shift the frequency to a lower range.
ところで第７図はテレビジョン信号の各フィールドにお
ける副搬送波の位相を示しており、現行ＮＴＳＣ方式の
色副搬送波（ｆｓｃ ＝３．５８ＭＨｚ ）の同一位相
の走査線を結ぶと、フィールド毎に上るように設定され
ている。一方、第５図で示した高精細情報挿入位置（Ｙ
Ｈ’ の位置）に信号を多重するためには、フィールド
毎に下がる副搬送波μ０を設定する必要がある。このμ
０は色副搬送波ｆｓｃに対してフィールド毎に位相が反
転したものである。このことは０式を３次元フーリエ変
換することによって証明できるが、ここでは省略する。By the way, Fig. 7 shows the phase of the subcarrier in each field of the television signal, and if you connect the scanning lines of the same phase of the color subcarrier (fsc = 3.58MHz) of the current NTSC system, the phase will increase for each field. is set to . On the other hand, the high-definition information insertion position (Y
In order to multiplex signals at the position H', it is necessary to set a subcarrier μ0 that decreases for each field. This μ
0 is a color subcarrier fsc whose phase is inverted for each field. This can be proven by performing three-dimensional Fourier transform on Equation 0, but this is omitted here.
第３図において、変ｇ器３７の搬送波入力端子には、色
副搬送波ｆｓｃを２分周したものをフィールド毎に反転
した高精細情報副搬送波μ０が入力され、ＹＨを周波数
シフトしている。In FIG. 3, a high-definition information subcarrier μ0, which is obtained by dividing the frequency of the color subcarrier fsc by two and inverting it for each field, is input to the carrier wave input terminal of the g converter 37, and YH is frequency-shifted.
第４図において入力されたＮＴＳＣ”信号は、時空間フ
ィルタ２０によって第５図で示したＹＨ！の部分の信号
を抽出し、復調器３６によって送信側と同様にｆｓｃ／
２をフィールド毎に反転した高精細情報副搬送波μ０に
よってＹＨ’を同期検波し、高精細輝度信号ＹＨを得て
いる。From the input NTSC" signal in FIG. 4, the signal of the YH! portion shown in FIG.
YH' is synchronously detected using a high-definition information subcarrier μ0 obtained by inverting 2 for each field to obtain a high-definition luminance signal YH.
従来の方式は以上のように構成されており、現行ＮＴＳ
Ｃ方式と完全交信性を有しつつ高精細輝度信号の伝送を
行なうことができる。しかし現行ＮＴＳＣ方式において
、伝送色信号の帯域は色差信号■が１．５ＭＨｚ、 Ｑ
が０．５ＭＨｚであり、輝度信号Ｙの帯域に比べ半分以
下の狭帯域である。従って色解像度の不足が問題となっ
ており、この点においては、上記従来の方式でも解消さ
れていない。The conventional system is configured as described above, and the current NTS
It is possible to transmit high-definition luminance signals while maintaining complete communication with the C method. However, in the current NTSC system, the transmission color signal band is 1.5MHz for the color difference signal ■, Q
is 0.5 MHz, which is a narrow band less than half the band of the luminance signal Y. Therefore, the lack of color resolution has become a problem, and this problem has not been solved even with the above-mentioned conventional methods.
この発明は上記のような問題点を解消するためになされ
たもので、色信号の高精細情報を伝送する高精細テレビ
ジョン信号伝送装置を得ることを目的とする。The present invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a high-definition television signal transmission device that transmits high-definition information of color signals.
この発明に係る高精細テレビジョン信号伝送装置は、広
帯域色差信号鳳 Ｑをそれぞれ高域周波数成分と低域周
波数成分とに分割する手段と、上記各信号の高域周波数
成分を周波数シフトする手段と、これらの周波数シフト
した信号を現行ＮＴＳＣ方式の時空間スペクトルのすき
間に直交変調多重する手段とを設けたものである。A high-definition television signal transmission device according to the present invention includes means for dividing a wideband color difference signal Q into high frequency components and low frequency components, and means for frequency shifting the high frequency components of each of the signals. , means for orthogonally modulating and multiplexing these frequency-shifted signals in the space-time spectrum gap of the current NTSC system.
この発明においては、広帯域色差信号Ｔ、Ｑをそれぞれ
高域と低域とに分割し、その高域成分を低域へ周波数シ
フトして直交変調多重を行うから、高精細色差信号を現
行ＮＴＳＣ信号と交信性を有しつつ伝送でき、色解像度
の高い高精細テレビジョン信号が得られる。In this invention, the wideband color difference signals T and Q are divided into high and low frequencies, and the high frequency components are frequency-shifted to the low frequency range to perform orthogonal modulation multiplexing. It is possible to transmit high-definition television signals with high color resolution.
以下この発明の一実施例を図について説明する。 An embodiment of the present invention will be described below with reference to the drawings.
第１図において、■は広帯域な色差信号１＋ＩＨを入力
とする高域フィルタ、２はこの高域フィルタ１の入力と
出力に接続された減算器、３は前記高域フィルタ１の出
力に接続された第１の変ｔＩＩ器、４は第１の変調器３
の出力に接続された低域フィルタ、５は低域フィルタ４
の出力に接続された第３の変調器である。また、６は広
帯域な色差信号Ｑ＋ＱＨを入力とする高域フィルタ、７
はこの高域フィルタ６の入力と出力に接続された減算器
、８は前記高域フィルタ６の出力に接続された第２の変
調器、９は第２の変調器８の出力に接続された低域フィ
ルタ、１０は低域フィルタ９の出力に接続された第４の
変調器である。１）は前記第３の変調Ｂ５と第４の変調
器１０の出力に接続された加算器、１２は加算器１）の
出力に接続された高域フィルタ、１３は前記減算器２と
減算器７の出力と輝度信号Ｙが入力されたＮＴＳＣエン
コーダ、１４は前記高域フィルタ１２とＮＴＳＣエンコ
ーダ１の出力が接続された加算器である。In FIG. 1, ■ is a high-pass filter that receives the broadband color difference signal 1+IH, 2 is a subtracter connected to the input and output of this high-pass filter 1, and 3 is connected to the output of the high-pass filter 1. 4 is the first modulator 3
A low-pass filter 5 is connected to the output of the low-pass filter 4.
a third modulator connected to the output of the modulator. In addition, 6 is a high-pass filter that receives the broadband color difference signal Q+QH, and 7
is a subtractor connected to the input and output of this high-pass filter 6, 8 is a second modulator connected to the output of the high-pass filter 6, and 9 is connected to the output of the second modulator 8. Low-pass filter 10 is a fourth modulator connected to the output of low-pass filter 9. 1) is an adder connected to the third modulation B5 and the output of the fourth modulator 10; 12 is a high-pass filter connected to the output of adder 1); 13 is the subtracter 2 and the subtracter 7 is an NTSC encoder to which the luminance signal Y is input, and 14 is an adder to which the high-pass filter 12 and the output of the NTSC encoder 1 are connected.
また、１５は色副搬送波ｆｓｃが入力され前記第１の変
１！１器３に接続された同期発振器、１６は色副搬送波
ｆｓｃが入力され前記第２の変調器８に接続された同期
発ｔｉ器、１７は色副搬送波が入力される同期発振器、
１８は同期発振器１７の出力に接続された位相反転器、
スイッチＳは位相反転器１８の入出力に接続されフィー
ルド毎に反転した搬送波を前記第３の変調器５に供給す
るものである。１９はスイッチＳに接続され、前記第４
の変調器１０に搬送波を供給する９０°移相器である。Further, 15 is a synchronous oscillator to which the color subcarrier fsc is inputted and connected to the first modulator 3, and 16 is a synchronous oscillator to which the color subcarrier fsc is inputted and connected to the second modulator 8. 17 is a synchronous oscillator into which the color subcarrier is input;
18 is a phase inverter connected to the output of the synchronous oscillator 17;
The switch S is connected to the input and output of the phase inverter 18 and supplies the third modulator 5 with a carrier wave inverted for each field. 19 is connected to the switch S, and the fourth
This is a 90° phase shifter that supplies a carrier wave to the modulator 10 of.
第２図は受信側の構成を示し、図において、２Ｏは時空
間フィルタ、２１は時空間フィルタ２０の入力と出力に
接続された減算器、２２は時空間フィルタ２０の出力に
接続された第１の復調器、２３は同様に時空間フィルタ
２０の出力に接続された第２の復調器、２４は第１の復
調器２２の出力に接続された第３の復調器、２５は第３
の復調器２４の出力に接続された帯域フィルタ、２６は
第２の復調器２３の出力に接続された第４の復調器、２
７は第４の復調器２６の出力に接続された帯域フィルタ
である。２８は前記減算器２１の出力に接続されたＮＴ
ＳＣデコーダ、２９はＮＴＳＣデコーダ２８と帯域フィ
ルタ２５に接続された加算器、３０はＮＴＳＣデコーダ
２８と帯域フィルタ２７に接続された加算器である。FIG. 2 shows the configuration of the receiving side. In the figure, 2O is a spatio-temporal filter, 21 is a subtracter connected to the input and output of the spatio-temporal filter 20, and 22 is a subtracter connected to the output of the spatio-temporal filter 20. 1 demodulator, 23 a second demodulator connected to the output of the spatio-temporal filter 20, 24 a third demodulator connected to the output of the first demodulator 22, 25 a third demodulator
a bandpass filter 26 connected to the output of the demodulator 24 of the second demodulator 23;
7 is a bandpass filter connected to the output of the fourth demodulator 26. 28 is an NT connected to the output of the subtracter 21.
The SC decoder 29 is an adder connected to the NTSC decoder 28 and the bandpass filter 25, and 30 is an adder connected to the NTSC decoder 28 and the bandpass filter 27.
また、３１は色副搬送波ｆｓｃを入力とする同期発振器
、３２は同期発振器３１の出力に接続された位相反転器
、スイッチＳは位相反転器３２の入出力に接続されフィ
ールド毎に反転した搬送波を前記第１の復調器２２に供
給するものである。３３はスイッチＳに接続され前記第
２の復調器２３に搬送波を供給する９０”移相器、３４
は色副搬送波ｆｓｃを入力とし前記第３の復調器２４に
搬送波を供給する同期発振器、３５は色副搬送波ｆｓｃ
を入力とし前記第４の復調器２６に搬送波を供給する同
期発振器である。Further, 31 is a synchronous oscillator which inputs the color subcarrier fsc, 32 is a phase inverter connected to the output of the synchronous oscillator 31, and switch S is connected to the input/output of the phase inverter 32 and outputs the carrier wave inverted for each field. It is supplied to the first demodulator 22. 33 is a 90" phase shifter connected to switch S and supplying a carrier wave to the second demodulator 23; 34
35 is a synchronous oscillator which receives the color subcarrier fsc and supplies a carrier wave to the third demodulator 24; 35 is a color subcarrier fsc;
This is a synchronous oscillator that receives as input and supplies a carrier wave to the fourth demodulator 26.
次に動作について説明する。第８図は現行ＮＴＳＣ方式
の色差信号■、Ｑの多重方式を示す周波数スペクトル図
であり、色差信号１．Ｑをそれぞれ１．５ＭＨ！、 ０
．５ＭＨ２に帯域制限し直交２相変調を行なうことによ
って周波数多重を行なっている。本方式においては、色
差信号の高域成分ＩＨ，ＱＨについても直交２相変調を
行ない、第５図に示した様な時空間周波数スペクトルの
すき間に挿入するものである。Next, the operation will be explained. FIG. 8 is a frequency spectrum diagram showing a multiplexing method for color difference signals 1 and 1 of the current NTSC system. Each Q is 1.5MH! , 0
．． Frequency multiplexing is performed by limiting the band to 5MH2 and performing orthogonal two-phase modulation. In this method, the high frequency components IH and QH of the color difference signal are also subjected to orthogonal two-phase modulation and inserted into the gap in the spatio-temporal frequency spectrum as shown in FIG.
第９図は本方式による高精細色差信号（ＩＨ：１．５〜
２．５ＭＩＩＺ、 ＱＨ： ０．５〜１．５ＭＨｚ）の
挿入方法の一例を示す周波数スペクトル図であり、同図
（ａ）は、色差信号Ｉ、Ｑとその高域成分ＩＨ，ＱＨの
ベースバンド帯域を示している。この色差信号高域成分
ＩＨ，ＱＨを周波数変換することによって同図（ｂ）に
示す様に一旦低域へ周波数シフトを行なう。このとき周
波数Ｏ〜−Ｉ ＭＨｚは下側波帯である。Figure 9 shows a high-definition color difference signal (IH: 1.5~
2.5 MIIZ, QH: 0.5 to 1.5 MHz) is a frequency spectrum diagram showing an example of an insertion method; FIG. Indicates the band. By frequency converting the color difference signal high-frequency components IH and QH, the frequency is once shifted to the lower frequency range as shown in FIG. 2(b). At this time, the frequency O to -I MHz is the lower sideband.
この色差信号高域成分ＩＨ’”、ＱＨ”をフィールド毎
に反転した高精８１）Ｉ信号副搬送波（ここでは０゜９
ｆｓｃ）μ０で直交２相変調すると同図（Ｃ）に示す様
に周波数多重することができる。High-precision 81) I signal subcarrier (in this case, 0°9
fsc) By performing orthogonal two-phase modulation with μ0, frequency multiplexing can be performed as shown in FIG.
第１図において、色差信号１＋ＩＨ，Ｑ＋ＱＨは高域成
分を含んだ信号であり、それぞれ高域フィルタ１．６に
入力されてそれぞれの高域成分（帯域ＩＭＨｚ）が抽出
され、ＩＨ，ＱＨとなる。減算器２によってＩ＋ＩＨ−
ＩＨが行なわれて色差信号Ｉが得られ、同様に減算器７
によって色差信号Ｑが得られる。この色差信号Ｉ、Ｑと
輝度信号ＹはＮＴＳＣエンコーダ１３に入力され、ＮＴ
ＳＣ信号に変換される。一方、ＩＨ，ＱＨはそれぞれ第
１の変調器３．第２の変調器８によって低域ヘシフトさ
れ、低域フィルタ４，９によって不要高域成分が除かれ
て色差信号高域成分ＩＨ”Ｚ ＱＨｌ １が得られる。In Fig. 1, color difference signals 1+IH and Q+QH are signals containing high-frequency components, and are each input to a high-pass filter 1.6 to extract their respective high-frequency components (bandwidth IMHz), resulting in IH and QH. . I+IH- by subtracter 2
IH is performed to obtain a color difference signal I, and the subtracter 7
A color difference signal Q is obtained. These color difference signals I, Q and luminance signal Y are input to the NTSC encoder 13,
It is converted into an SC signal. On the other hand, IH and QH are each connected to the first modulator 3. The second modulator 8 shifts the signal to a lower frequency band, and the low-pass filters 4 and 9 remove unnecessary high-frequency components to obtain a color difference signal high-frequency component IH''Z QHl 1.
一方、色副搬送波ｆｓｃは同期発振器１７によって周波
数が０．９ｆｓｃとされ、位相反転器１８へ入力される
。スイッチＳによってフィールド毎に反転された高精細
信号副搬送波μ０は第３の変調２３５に入力される。ま
たμ０は移相器１９によって９０°移和され、第４の変
調器１０に入力される。前記第３の変調器５にはＩ Ｈ
”、前記第４の変調器１０にはＱＨ”が入力され、互い
に９０”位相が異なる搬送波で振幅変調を受けた後加算
器１）によって加算され、Ｉ Ｈ”とＱＨ”とは直交２
相変調される。この直交２相変調された信号は高域フィ
ルタ１２によって不要低域成分が除かれ、前記ＮＴＳＣ
エンコーダ１３の出力と加算器１４によって合成され、
伝送信号ＮＴＳＣ’を得る。On the other hand, the color subcarrier fsc has a frequency of 0.9 fsc by the synchronous oscillator 17 and is input to the phase inverter 18 . The high-definition signal subcarrier μ0 inverted field by field by the switch S is input to the third modulation 235. Further, μ0 is shifted by 90° by a phase shifter 19 and input to the fourth modulator 10. The third modulator 5 has an IH
", QH" is input to the fourth modulator 10, and after being amplitude modulated with carrier waves having a phase difference of 90", they are added by an adder 1), and IH" and QH" are orthogonal 2
Phase modulated. This orthogonal two-phase modulated signal is filtered by a high-pass filter 12 to remove unnecessary low-frequency components.
The output of the encoder 13 and the adder 14 are combined,
A transmission signal NTSC' is obtained.
次に受信側においては、伝送信号ＮＴＳＣ’ は時空間
フィルタ２０に入力され、これにより直交２相変調され
た高精細色差信号が抽出され、第１送信号ＮＴＳＣ’か
ら高精細色差信号が差引かれて高精細情報が多重されて
いないＮＴＳＣ信号をえる。このＮＴＳＣ信号はＮＴＳ
Ｃデコーダ２８に入力され、色差信号１．Ｑと輝度信号
Ｙとに分離される。一方、色副搬送波ｆｓｃが入力され
た同期発振器３１からの周波数０．９ｆｓｃの搬送波を
位相反転器３２とスイッチＳによりフィールド反転し、
高精細信号副搬送波μ０を得る。このμＯは前記第１の
復調器２２に供給され、これにより同期検波を行なう。Next, on the receiving side, the transmission signal NTSC' is input to a spatiotemporal filter 20, which extracts a high-definition color difference signal subjected to orthogonal two-phase modulation, and subtracts the high-definition color difference signal from the first transmission signal NTSC'. to obtain an NTSC signal on which high-definition information is not multiplexed. This NTSC signal is
The color difference signals 1. Q and luminance signal Y. On the other hand, the carrier wave with a frequency of 0.9 fsc from the synchronous oscillator 31 into which the color subcarrier fsc is input is field inverted by the phase inverter 32 and the switch S.
Obtain high-definition signal subcarrier μ0. This μO is supplied to the first demodulator 22, thereby performing synchronous detection.
これによって直交変調された信号よりＩＨ’”が分離さ
れる。同様に、移相器３．３によって＋９０°移和され
た搬送波は前記第２の復ｉｌｌ器２３に入力され、同期
検波が行なわれてＱＨ”が分離される。ＩＨ”、ＱＨ”
はそれぞれ第３の復調器２４．第４の復調器２６に入力
され、それぞれ０．４２ｆｓｃ 、 ０．１４ｆｓｃの
搬送波周波数によって周波数シフトされる。前記第３の
復調器２４の出力は帯域フィルタ２５によって伝送前の
ＩＨの帯域が取り出される。同様に帯域フィルタ２７に
よってＱＨが抽出される。これらＩＨ，ＱＨはそれぞれ
前記ＮＴＳＣデコーダ２８の出力の色差信号Ｉ。This separates IH''' from the orthogonally modulated signal.Similarly, the carrier wave shifted by +90° by the phase shifter 3.3 is input to the second demodulator 23, where synchronous detection is performed. QH'' is separated. IH", QH"
are the third demodulators 24 . The signals are input to a fourth demodulator 26 and frequency shifted by carrier frequencies of 0.42 fsc and 0.14 fsc, respectively. The IH band before transmission is extracted from the output of the third demodulator 24 by a bandpass filter 25. Similarly, QH is extracted by bandpass filter 27. These IH and QH are color difference signals I output from the NTSC decoder 28, respectively.
Ｑと加算器２９．加算器３０によって合成され、再生色
差信号１＋ＩＨとＱ＋ＱＨとを得る。Q and adder 29. They are combined by an adder 30 to obtain reproduced color difference signals 1+IH and Q+QH.
ここで、本方式の高精細テレビジョン信号伝送方式では
、多重された高精細信号は比較的レベルが小さい。また
、高精細信号副搬送波μ０は第７図に示した様にライン
反転、フィールド反転するので、本方式の信号を現行Ｎ
ＴＳＣ方式テレビ受信機で再生しても妨害は目立たない
。In this high-definition television signal transmission system, the multiplexed high-definition signal has a relatively low level. In addition, since the high-definition signal subcarrier μ0 is line inverted and field inverted as shown in Figure 7, the signal of this method can be
Even when played back on a TSC TV receiver, the interference is not noticeable.
なお、上記説明では特にことわらなかったが、実施例は
現在の技術ではディジタル回路で構成するのが一般的で
ある。Although not particularly mentioned in the above description, the embodiments are generally constructed using digital circuits in the current technology.
以上のように、この発明によれば、広帯域な色差信号１
．Ｑをそれぞれ高域、低域に分割し、その各高域成分を
低域へ周波数シフトして直交変調し多重するようにした
ので、高精細色差信号を現行ＮＴＳＣ信号と交信性を有
しつつ伝送することができ、色解像度の高い高精細テレ
ビジョン信号伝送装置が得られる効果がある。As described above, according to the present invention, the broadband color difference signal 1
．． Q is divided into high and low frequencies, and each high frequency component is frequency shifted to the low frequency range, orthogonally modulated, and multiplexed, allowing high-definition color difference signals to be communicated with current NTSC signals while maintaining communication performance. This has the effect of providing a high-definition television signal transmission device that can transmit high-definition television signals and has high color resolution.
第１図はこの発明の一実施例による高精細色差信号挿入
回路を示すブロック図、第２図はこの発明の一実施例に
よる高精細色差信号再生回路を示すブロック図、第３図
は従来の高精細テレビジョン信号挿入回路を示すブロッ
ク図、第４図は従来の高精細テレビジョン信号再生回路
を示すブロック図、第５図は垂直一時間領域の高精細情
報挿入位置を示す時空間スペクトル図、第６図は従来の
高精細情報多重方式を示す１次元スペクトル図、第７図
はテレビジョン信号のフィールド毎の搬送波の位相を示
す説明図、第８図は現行ＮＴＳＣ方式の色差信号多重方
式を示す１次元スペクトル図、第９図は本発明による高
精細色差信号多重方式を示す１次元スペクトル図である
。
１．６．１２・・・高域フィルタ、２，７．２１・・・
減算器、３・・・第１の変調器、４．９・・・低域フィ
ルタ、５・・・第３の変調器、８・・・第２の変調器、
１０・・・第４の変調器、１），１４，２９．３０・・
・加算器、１３・・・ＮＴＳＣエンコーダ、１５〜１７
，３１．３４．３５・・・同期発振器、１８．３２・・
・位相反転器、１９．３３・・・移相器、２０・・・時
空間フィルタ、２２・・・第１の復調器、２３・・・第
２の復調器、２４・・・第３の復調器、２５．２７・・
・帯域フィルタ、２６・・・第４の復−器、２８・・・
ＮＴＳＣデコーダ。
なお図中同一符号は同−又は相当部分を示す。FIG. 1 is a block diagram showing a high-definition color difference signal insertion circuit according to an embodiment of the present invention, FIG. 2 is a block diagram showing a high-definition color difference signal reproducing circuit according to an embodiment of the invention, and FIG. 3 is a block diagram showing a high-definition color difference signal reproducing circuit according to an embodiment of the present invention. A block diagram showing a high-definition television signal insertion circuit, FIG. 4 is a block diagram showing a conventional high-definition television signal reproducing circuit, and FIG. 5 is a spatio-temporal spectrum diagram showing high-definition information insertion positions in the vertical temporal domain. , Fig. 6 is a one-dimensional spectrum diagram showing the conventional high-definition information multiplexing system, Fig. 7 is an explanatory diagram showing the phase of the carrier wave for each field of a television signal, and Fig. 8 is the color difference signal multiplexing system of the current NTSC system. FIG. 9 is a one-dimensional spectrum diagram showing the high-definition color difference signal multiplexing method according to the present invention. 1.6.12...High-pass filter, 2,7.21...
Subtractor, 3... First modulator, 4.9... Low pass filter, 5... Third modulator, 8... Second modulator,
10... Fourth modulator, 1), 14, 29.30...
・Adder, 13...NTSC encoder, 15 to 17
, 31.34.35...Synchronous oscillator, 18.32...
- Phase inverter, 19.33... Phase shifter, 20... Space-time filter, 22... First demodulator, 23... Second demodulator, 24... Third demodulator Demodulator, 25.27...
- Bandpass filter, 26... Fourth decoder, 28...
NTSC decoder. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
を有する高精細テレビジョン信号の伝送装置であって、 広帯域な２つの色差信号をそれぞれ高域周波数成分と低
域周波数成分とに分割する信号分割手段と、 前記２つの色差信号の高域周波数成分をそれぞれ低域へ
所定周波数シフトする周波数変換手段と、この２つの周
波数変換された信号を直交２相変調する変調手段と、 この変調手段の出力を現行ＮＴＳＣ方式テレビジョン信
号に多重化する多重化手段とを備えたことを特徴とする
高精細テレビジョン信号伝送装置。(1) A high-definition television signal transmission device that is fully compatible with the current NTSC television signal, and is a signal splitting device that divides two broadband color difference signals into high frequency components and low frequency components, respectively. means, frequency conversion means for shifting the high frequency components of the two color difference signals to a lower frequency by a predetermined frequency, modulation means for performing orthogonal two-phase modulation of the two frequency-converted signals, and an output of the modulation means. 1. A high-definition television signal transmission device comprising: multiplexing means for multiplexing a current NTSC television signal into a current NTSC television signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61242608A JPS6397085A (en) | 1986-10-13 | 1986-10-13 | Transmitting device for high definition television signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61242608A JPS6397085A (en) | 1986-10-13 | 1986-10-13 | Transmitting device for high definition television signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6397085A true JPS6397085A (en) | 1988-04-27 |
Family
ID=17091580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61242608A Pending JPS6397085A (en) | 1986-10-13 | 1986-10-13 | Transmitting device for high definition television signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6397085A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5053858A (en) * | 1989-12-22 | 1991-10-01 | General Electric Company | Chrominance signal processing appartus for widescreen television system |
-
1986
- 1986-10-13 JP JP61242608A patent/JPS6397085A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5053858A (en) * | 1989-12-22 | 1991-10-01 | General Electric Company | Chrominance signal processing appartus for widescreen television system |
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