JPH01168191A - Television signal processing method - Google Patents
Television signal processing methodInfo
- Publication number
- JPH01168191A JPH01168191A JP62325877A JP32587787A JPH01168191A JP H01168191 A JPH01168191 A JP H01168191A JP 62325877 A JP62325877 A JP 62325877A JP 32587787 A JP32587787 A JP 32587787A JP H01168191 A JPH01168191 A JP H01168191A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- television
- band
- carrier wave
- multiplexed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003672 processing method Methods 0.000 title claims description 14
- 238000001514 detection method Methods 0.000 claims description 13
- 230000001360 synchronised effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 7
- 230000002238 attenuated effect Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 230000010363 phase shift Effects 0.000 abstract description 3
- 230000002194 synthesizing effect Effects 0.000 abstract 1
- 239000013598 vector Substances 0.000 description 26
- 238000010586 diagram Methods 0.000 description 15
- 238000001228 spectrum Methods 0.000 description 9
- 230000008929 regeneration Effects 0.000 description 6
- 238000011069 regeneration method Methods 0.000 description 6
- 239000002131 composite material Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Landscapes
- Color Television Systems (AREA)
- Television Systems (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、現行のテレビジョン放送信号に別の信号を多
重伝送するテレビジョン信号処理方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a television signal processing method for multiplexing and transmitting another signal onto a current television broadcast signal.
従来の技術
我が国の現在のＮＴＳＣ（ナショナル テレビジョン
システム コミッティ（Ｎａｔｉｏｎａｌ Ｔｅ１ｅ−
ｖｉｓｉｏｎ Ｓｙｓｔｅｍ Ｃｏｍｍ１ｔｔｅｅ ）
）方式によるカラーテレビジョン放送が昭和３５年に
開始されて以来、２５年以上が経過した。その間、高精
細な画面に対する要求と、テレビジョン受信機の性能向
上に伴い、各種の新しいテレビジョン方式が提案されて
いる。また、サービスされる番組の内容自体も単なるス
タジオ番組や中継番組などから、シネマサイズの映画の
放送など、より高画質で臨場感を伴う映像を有する番組
へと変化してきている。Conventional technology Japan's current NTSC (National Television Network)
System Committee (National Te1e-
vision system comm1tee)
) system began color television broadcasting in 1960, more than 25 years have passed since then. In the meantime, various new television systems have been proposed in response to demands for high-definition screens and improvements in the performance of television receivers. Furthermore, the content of the programs provided is changing from simple studio programs and relay programs to programs with higher quality and more realistic images, such as cinema-sized movie broadcasts.
現行放送は、走査線数５２５本、２：１飛越走査、輝度
信号水平帯域幅４．２ＭＨｚ、アスペクト比４：３とい
う諸仕様（例えば、文献放送技術双書 カラーテレビジ
ョン 日本放送協会線、日本放送出版協会、１９６１年
、参照）を有しているが、このような背景のもとで現行
放送との両立性及び、水平解像度の向上を図ったテレビ
ジョン信号構成方法が提案されている。−例を以下に述
べる。ＮＴＳＣ方式のテレビジョン信号を時間周波数ｆ
１と垂直周波数ｆ２の２次元平面で図示すると第５図の
ようになる。色信号Ｃは色副搬送波ｆｓｃの位相関係か
ら第２、第４象限に存在することになる。ここで空いて
いる第１、第３象限に輝度信号の高域成分を多重し、受
信側ではフィールド演算により色信号と多重高域成分を
分離し水平解像度を向上させるということを特徴として
いる。（特開昭５９−１７１３８７号公報 参照）
発明が解決しようとする問題点
以上のように、現行のテレビジョン放送は、信号の帯域
が規格で制限されており、更に何らかの多量情報を付加
することは容易ではない。例えば水平解像度を向上させ
る方法の提案がなされているが、現行のテレビジョン放
送に対する両立性及び、動画像時における高域成分復調
特性の劣化という観点からすると問題が残されている。Current broadcasting has specifications such as 525 scanning lines, 2:1 interlaced scanning, luminance signal horizontal bandwidth of 4.2 MHz, and aspect ratio of 4:3 (for example, Literature Broadcasting Technology Book, Color Television, Japan Broadcasting Corporation Line, Japan Broadcasting Corporation). Japan Publishing Association, 1961), but against this background, a method of configuring television signals has been proposed that is compatible with current broadcasting and improves horizontal resolution. - Examples are given below. NTSC television signal with time frequency f
1 and vertical frequency f2 on a two-dimensional plane as shown in FIG. The color signal C exists in the second and fourth quadrants from the phase relationship of the color subcarrier fsc. The system is characterized in that the high-frequency components of the luminance signal are multiplexed into the vacant first and third quadrants, and on the receiving side, the color signal and the multiplexed high-frequency components are separated by field calculation to improve the horizontal resolution. (Refer to Japanese Unexamined Patent Publication No. 59-171387) Problems to be Solved by the Invention As mentioned above, in current television broadcasting, the signal band is limited by the standard, and it is difficult to add some kind of large amount of information. is not easy. For example, methods for improving horizontal resolution have been proposed, but problems remain in terms of compatibility with current television broadcasting and deterioration of high frequency component demodulation characteristics during moving images.
また電波資源の有効利用という点からすると、徒に伝送
帯域を拡張するわけにはいかない。Also, from the point of view of effective use of radio wave resources, the transmission band cannot be expanded unnecessarily.
本発明はかかる問題点に鑑みてなされたもので、現行の
テレビジョン方式と両立性があり、拡張する帯域以上の
伝送帯域が確保でき、周波数の利用効率良く多量の情報
を多重伝送できるテレビジョン信号処理方法を提供する
ことを目的とする。The present invention has been made in view of these problems, and is a television that is compatible with the current television system, can secure a transmission band greater than the band to be expanded, and can multiplex transmit a large amount of information with efficient frequency utilization. The purpose is to provide a signal processing method.
問題点を解決するための手段
上記問題点を解決するために本発明のテレビジョン信号
処理方法は、映像信号で第１ｍ送波を残留側波帯振幅変
調したテレビジョン信号と、前記第ｉｓ送波と同一周波
数でかつ位相が異なる第２搬送波を、前記映像信号とは
異なる多重信号で変調した信号とを合成する手段と、合
成した信号を直交ひずみを除去するフィルタで帯域制限
し、同期検波することにより前記多重信号を復調する手
段とを備えている。Means for Solving the Problems In order to solve the above-mentioned problems, the television signal processing method of the present invention uses a television signal obtained by modulating the vestigial sideband amplitude of the first m-th transmission wave with a video signal, and the is-th transmission wave. A means for combining a second carrier wave having the same frequency and a different phase as the video signal with a signal modulated by a multiplexed signal different from the video signal, band-limiting the combined signal with a filter that removes orthogonal distortion, and performing synchronous detection. and means for demodulating the multiplexed signal by doing so.
作用
本発明は上記した方法によって、限られた電波資源を有
効に活用して、現行のテレビジョン放送に加えて新たな
る別の情報を多重伝送可能とするテレビジョン信号を生
成することにより、専用の受信機では従来のテレビジョ
ン放送の映像のみならず多重された情報をも得ることが
でき、さらに現行のテレビジョン受信機でも従来のテレ
ビジョン放送の映像を殆ど支障なく受信することができ
る。The present invention utilizes the method described above to effectively utilize limited radio wave resources to generate a television signal that enables multiplex transmission of new and different information in addition to current television broadcasting. With this receiver, it is possible to obtain not only images of conventional television broadcasts but also multiplexed information, and furthermore, even with current television receivers, images of conventional television broadcasts can be received with almost no problems.
実施例
以下本発明の一実施例について、図面を参照しながら説
明する。EXAMPLE An example of the present invention will be described below with reference to the drawings.
第１図は、本発明の一実施例に係る送信側でのテレビジ
ョン信号処理方法を示すスペクトル図である。第１図（
ａ）は現行テレビジョン方式における残留側波帯振幅変
調されたテレビジョン信号のスペクトル図の一例である
。ここでは映像搬送波Ｐ１の下側波帯が残留側波帯とな
っている場合を示す。FIG. 1 is a spectrum diagram showing a television signal processing method on the transmitting side according to an embodiment of the present invention. Figure 1 (
a) is an example of a spectrum diagram of a television signal subjected to vestigial sideband amplitude modulation in the current television system. Here, a case is shown in which the lower sideband of the video carrier wave P1 is a residual sideband.
第１図中）は第１図（ａ）で示したテレビジョン信号と
は別の多重信号で、映像搬送波Ｐ１と同一周波数でかつ
位相が合成時に９０°異なる搬送波Ｐ２を、すくなくと
も帰線期間で搬送波Ｐ２を除去するように両側波帯振幅
変調したものである。第１図（Ｃ１は前記における両側
波帯振幅変調を単側波帯振幅変調としたものである。第
１図（ｄ）は前記における両側波帯振幅変調を残留側波
帯振幅変調としたものである。第１図（ｄｌの信号を第
１図（ａ）のテレビジョン信号に多重したものが第１図
（ｅ）であり、本発明により合成されるテレビジョン信
号となる。なお第１図（１）りでは多重する信号を第１
図＋ｄ）の信号としたが、第１図（ｂ）、第１図（Ｃ１
の信号であってもよい。また多重信号で変調した信号の
帯域を、搬送波Ｐ２より４．２５ＭＨｚ低い周波数から
１．２５ＭＨｚ高い周波数までとしたがこれに限るもの
ではない。また多重信号はアナログ信号に限らずディジ
タル信号でもよい。(in Figure 1) is a multiplexed signal different from the television signal shown in Figure 1 (a), in which a carrier wave P2 which has the same frequency as the video carrier wave P1 but whose phase differs by 90 degrees during synthesis is transmitted at least during the retrace period. Both side band amplitude modulation is performed so as to remove the carrier wave P2. Figure 1 (C1 shows the double sideband amplitude modulation in the above case being changed to single sideband amplitude modulation. Figure 1 (d) shows the double sideband amplitude modulation in the above case being changed to vestigial sideband amplitude modulation. FIG. 1(e) shows the signal of FIG. 1(dl) multiplexed with the television signal of FIG. In Figure (1), the signals to be multiplexed are
Figure 1 (b) and Figure 1 (C1
It may be a signal of Further, although the band of the signal modulated by the multiplexed signal is from a frequency 4.25 MHz lower than the carrier wave P2 to a frequency 1.25 MHz higher, it is not limited to this. Further, the multiplexed signal is not limited to an analog signal, but may be a digital signal.
第２図は、本発明の一実施例における送信側でのテレビ
ジョン信号処理方法を示すブロック図である。１は映像
バースバンド信号入力端子、２は振幅変調器、３は第１
フイルタ、４は発振器、５は移相器、６は多重信号入力
端子、７は変調器、８は第２フイルタ、９は加算器、１
０は合成テレビジョン信号出力端子である。映像ベース
バンド信号入力端子ｌから入力される映像ベースバンド
信号で、発振器４から得られる搬送波Ｐ１を振幅変調器
２により振幅変調する。得られた振幅変調波を第１フイ
ルタ３で帯域制限し残留側波帯にした後に加算器９に加
える。発振器４から得られる搬送波Ｐ、を、加算器９で
の加算時に搬送波Ｐ１と位相が９０°異なるように移相
器５により位相シフトされたものを搬送波Ｐ２とする。FIG. 2 is a block diagram showing a television signal processing method on the transmitting side in one embodiment of the present invention. 1 is a video broadband signal input terminal, 2 is an amplitude modulator, and 3 is a first
4 is an oscillator, 5 is a phase shifter, 6 is a multiple signal input terminal, 7 is a modulator, 8 is a second filter, 9 is an adder, 1
0 is a composite television signal output terminal. A carrier wave P1 obtained from an oscillator 4 is amplitude-modulated by an amplitude modulator 2 using a video baseband signal input from a video baseband signal input terminal l. The obtained amplitude modulated wave is band-limited by the first filter 3 to form a residual sideband, and then added to the adder 9. The carrier wave P obtained from the oscillator 4 is phase-shifted by the phase shifter 5 so that the phase differs by 90 degrees from the carrier wave P1 during addition by the adder 9, and the carrier wave P2 is obtained.
多重信号入力端子６から入力された多重信号で、搬送波
Ｐ２を両側波帯振幅変調し、す（なくとも帰線期間では
搬送波除去両側波帯振幅変調する。なお、移相器５の位
相シフト方向は固定でもよいが、例えば−水平走査期間
、−フィールド期間、−フレーム期間毎に位相シフト方
向を変えてやってもよい。変調された信号を第２フイル
タ８で帯域制限した後に加算器９に加える。加算器９の
出力が合成テレビジョン信号となる。ここで振幅変調器
２と第２フイルタ８の出力を加算したのちに第１フイル
タに入力し、第１フイルタの出力を合成テレビジョン信
号としてもよい。なお第２フイルタ８の周波数特性によ
り、多重される信号は第１図（ｂ）、第１図（Ｃ）、第
１図（ｃｌのような帯域を有する信号となる。The carrier wave P2 is amplitude modulated in both sidebands by the multiplexed signal inputted from the multiplexed signal input terminal 6, and the carrier wave P2 is amplitude modulated in both sidebands with the carrier removed (at least during the retrace period. Note that the phase shift direction of the phase shifter 5 may be fixed, but the phase shift direction may be changed for each horizontal scanning period, field period, and frame period.After the modulated signal is band-limited by the second filter 8, it is sent to the adder 9. The output of the adder 9 becomes the composite television signal.The outputs of the amplitude modulator 2 and the second filter 8 are added together and then input to the first filter, and the output of the first filter becomes the composite television signal. Note that, depending on the frequency characteristics of the second filter 8, the multiplexed signal becomes a signal having a band as shown in FIG. 1(b), FIG. 1(C), and FIG. 1(cl).
次に本発明の一実施例における受信側でのテレビジョン
信号処理方法について説明する。以下では地上放送の場
合を例にとる。第４図（ａ）は映像同期検波をおこなっ
ている現行のテレビジョン受信機のブロック図である。Next, a television signal processing method on the receiving side in an embodiment of the present invention will be described. In the following, we will take the case of terrestrial broadcasting as an example. FIG. 4(a) is a block diagram of a current television receiver that performs video synchronous detection.
４１とアンテナ、４２はチューナ、４３は映像中間周波
フィルタ、４４は映像検波器、４５は搬送波再生回路、
４６は映像ベースバンド信号出力端子である。送信側か
ら送出された信号はアンテナ４１で受信され、チューナ
４２で中間周波数帯に周波数変換され、映像中間周波フ
ィルタ４３で帯域制限される。帯域制限された信号は、
映像検波器４４、搬送波再生回路４５に供給される。搬
送波再生回路４５では、同期検波用の搬送波１）を再生
する。帯域制限された信号は、搬送波■、で映像検波器
４４において検波され、映像ベースバンド信号となる。41 is an antenna, 42 is a tuner, 43 is a video intermediate frequency filter, 44 is a video detector, 45 is a carrier wave regeneration circuit,
46 is a video baseband signal output terminal. A signal sent from the transmitting side is received by an antenna 41, frequency-converted to an intermediate frequency band by a tuner 42, and band-limited by a video intermediate frequency filter 43. A band-limited signal is
The signal is supplied to a video detector 44 and a carrier wave reproducing circuit 45. The carrier wave regeneration circuit 45 regenerates the carrier wave 1) for synchronous detection. The band-limited signal is detected by the video detector 44 using the carrier wave 2, and becomes a video baseband signal.
ここで映像中間周波フィルタ４３の周波数特性について
述べる。その周波数特性を示したものが第４図（ｂ）で
ある。すなわち映像搬送波Ｉｔのところで振幅が６ｄＢ
減衰し、映像搬送波■１に関してほぼ奇対称な振幅特性
を有するようなナイキストフィルタ特性となっている。Here, the frequency characteristics of the video intermediate frequency filter 43 will be described. FIG. 4(b) shows the frequency characteristics. In other words, the amplitude at the video carrier wave It is 6 dB.
It has a Nyquist filter characteristic that is attenuated and has an amplitude characteristic that is almost oddly symmetrical with respect to the video carrier wave (1).
一方策１図（ｄ）で示したように、多重信号を前記受信
機の映像中間周波フィルタの周波数特性とは逆の特性を
もつフィルタで帯域制限すれば、第４図（ｂｌの斜線部
分の多重信号成分はほぼ両側波帯となる。これをベクト
ル表示すると第４図（Ｃ１のようになる。ここでＩ１は
映像ベースバンド信号の映像搬送波、Ｉ２は多重信号の
搬送波でＩ１と同一周波数でかつ位相が９０°異なる搬
送波である。映像ベースバンド信号は搬送波Ｉ、を中心
に考えると残留側波帯となっているので、上下側波帯は
ベクトルａｕ、ベクトルａＬとなり直交ベクトルに分解
するとベクトルａｌ、ベクトルａ、となる。また多重信
号はほぼ両側波帯となっているので、上下側波帯をベク
トルに’ＬｌｓベクトルｂＬとすればそれらの合成ベク
トルはｂ２となり、ベクトルＩ、 と直交する成分だけ
となる。すなわち搬送波■１で同期検波するとベクトル
ａ２、ベクトルｂｔ成分による直交ひずみは発生せず、
映像同期検波をおこなっている現行のテレビジョン受信
機に対する多重信号による妨害は原理的におこらない。On the other hand, as shown in Figure 1 (d), if the multiplexed signal is band-limited using a filter with a frequency characteristic opposite to that of the video intermediate frequency filter of the receiver, then as shown in Figure 4 (the shaded part of bl) The multiplexed signal component almost has both sidebands. If this is represented as a vector, it will look like Figure 4 (C1). Here, I1 is the video carrier of the video baseband signal, and I2 is the carrier of the multiplexed signal, which has the same frequency as I1. And they are carrier waves with a phase difference of 90 degrees.If the video baseband signal is centered around carrier wave I, it becomes a residual sideband, so the upper and lower sidebands become vector au and vector aL, and when decomposed into orthogonal vectors, vector al, vector a.Also, since the multiplexed signal has almost both sidebands, if the upper and lower sidebands are used as vectors 'Lls vector bL, their combined vector will be b2, which is orthogonal to vector I, In other words, if carrier wave ■1 is used for synchronous detection, orthogonal distortion due to vector a2 and vector bt components will not occur.
In principle, multiple signals do not interfere with current television receivers that perform video synchronous detection.
多重する信号が第１図（ｂ）のような信号の場合には、
映像中間周波フィルタ４３で帯域制限されたとき両側波
帯とならないので、直交ひずみが発生する可能性がある
。If the signals to be multiplexed are as shown in Figure 1(b),
When the band is limited by the video intermediate frequency filter 43, there is no double-side band, so orthogonal distortion may occur.
しかし例えばレベルを下げて多重すれば、現行のテレビ
ジョン受信機に与える妨害は少なくなる。However, if multiplexing is performed at a lower level, for example, there will be less interference to current television receivers.
また多重する信号が第１図（Ｃ）のような信号の場合に
も同様であるが、スペクトルの関係で妨害の程度はさら
に少なくなる。The same is true when the signals to be multiplexed are as shown in FIG. 1(C), but the degree of interference is further reduced due to the spectrum.
次に本発明の一実施例における受信側での多重信号復調
方法について説明する。チューナの出力である映像中間
周波帯の信号を第３図（ａｌのように映像ベースバンド
信号が両側波帯となるようにフィルタで帯域制限する。Next, a multiplex signal demodulation method on the receiving side in an embodiment of the present invention will be described. The video intermediate frequency band signal output from the tuner is band-limited by a filter so that the video baseband signal becomes a double-side band as shown in FIG. 3 (al).
これをベクトル表示すると第３図（ｂｌのようになる。If this is expressed as a vector, it will look like Figure 3 (bl).
多重信号は搬送波Ｉ２を中心に考えると残留側波帯とな
っているので、上下側波帯はベクトルｂＵ、ベクトルｂ
Ｌとなり直交ベクトルに分解するとベクトルｂ＋、ベク
トルｂ２となる。また映像ベースバンド信号はフィルタ
によりほぼ両側波帯となるので、上下側波帯をベクトル
ａＬＩ、ベクトルａＬとすればそれらの合成ベクトルは
ａｌとなり、ベクトルＩ２と直交する成分だけとなる。Since the multiplexed signal has residual sidebands when considering carrier wave I2 as the center, the upper and lower sidebands are vector bU, vector b
When it becomes L and is decomposed into orthogonal vectors, it becomes vector b+ and vector b2. Furthermore, since the video baseband signal becomes substantially double-sideband due to the filter, if the upper and lower sidebands are vector aLI and vector aL, their combined vector is al, which consists of only the component orthogonal to vector I2.
すなわち搬送波Ｉ２で同期検波するとベクトルａＩ、ベ
クトルｂ、成分による直交ひずみは発生せず、多重信号
成分のみを復調することができる。第３図（Ｃ）は多重
信号を復調するテレビジョン受信機のブロック図の一例
である。３１はアンテナ、３２はチューナ、３３は映像
中間周波フィルタ、３４は映像検波器、３５は搬送波再
生回路、３６は映像ベースバンド信号出力端子、３７は
フィルタ、３８は移相器、３９は多重信号検波器、４０
は多重信号出力端子である。送信側から送出された信号
はアンテナ３１で受信され、チューナ３２で中間周波数
帯に周波数変換され、映像中間周波フィルタ３３で帯域
制限される。帯域制限された信号は、映像検波器３４、
搬送波再生回路３５に供給される。That is, when synchronous detection is performed using carrier wave I2, orthogonal distortion due to vector aI, vector b, and components does not occur, and only the multiplexed signal component can be demodulated. FIG. 3(C) is an example of a block diagram of a television receiver that demodulates multiplexed signals. 31 is an antenna, 32 is a tuner, 33 is a video intermediate frequency filter, 34 is a video detector, 35 is a carrier wave regeneration circuit, 36 is a video baseband signal output terminal, 37 is a filter, 38 is a phase shifter, and 39 is a multiplexed signal. Detector, 40
is a multiplex signal output terminal. A signal sent from the transmitting side is received by an antenna 31, frequency-converted to an intermediate frequency band by a tuner 32, and band-limited by a video intermediate frequency filter 33. The band-limited signal is processed by a video detector 34,
The signal is supplied to the carrier wave regeneration circuit 35.
搬送波再生回路３５では、同期検波用の搬送波１）を再
生する。帯域制限された信号は、搬送波■１で映像検波
器３４において検波され、映像ベースバンド信号となる
。またチューナ３２の出力はフィルタ３７で第３図（ａ
）のように帯域制限する。搬送波再生回路３５から得ら
れる搬送波Ｉｔを、移相器３８により送信側と同じよう
に位相シフトさせた搬送波■２で、帯域制限された信号
を多重信号検波器３９において同期検波する。検波出力
が多重信号となる。なた多重信号が第１図（ｂｌ、第１
図（Ｃ１のような信号であっても、同様に復調すること
ができる。The carrier wave regeneration circuit 35 regenerates the carrier wave 1) for synchronous detection. The band-limited signal is detected by the video detector 34 using carrier wave 1, and becomes a video baseband signal. Further, the output of the tuner 32 is passed through a filter 37 as shown in FIG.
) to limit the bandwidth. The carrier wave It obtained from the carrier wave regeneration circuit 35 is phase-shifted by the phase shifter 38 in the same manner as on the transmitting side, and the band-limited signal is synchronously detected in the multiple signal detector 39. The detection output becomes a multiplexed signal. The multiplexed signal is shown in Figure 1 (bl, 1st
Even a signal like the one shown in Figure (C1) can be demodulated in the same way.
発琲赤拗魂
以上述べたように現行の受信機では、映像搬送波Ｉｔで
同期検波することにより、多重信号はほぼ打ち消される
ので、多重信号による妨害は殆ど発生しない。また多重
信号復調用の受信機では、前記処理と同様に映像ベース
バンド信号だけでなく、フィルタリング及び映像搬送波
Ｉ２で同期検波することにより、多重信号も直交ひずみ
なく取り出すことができる。また、現行テレビジョン放
送の占有する帯域に例えば３．０ＭＨｚを付加すること
により、直交変調によって原理的に４．２５ＭＨｚまで
の帯域を確保することができ、単純に３．０ＭＨｚを周
波数多重した場合とくらべて、約１．４倍以上周波数利
用効率を高めることができる。また別の搬送波を多重信
号で変調し、周波数多重する方法と比較して、映像搬送
波の直交変調により多重信号を伝送する場合には、基本
となる搬送波は一波でよく、受信機の復調用搬送波を別
々に再生する必要がなく、受信機のキャリアビート等の
受信性能の点でもコストの面でも有利である。As stated above, in current receivers, multiplexed signals are almost canceled by synchronous detection using the video carrier wave It, so interference due to multiplexed signals hardly occurs. Further, in a receiver for multiplex signal demodulation, in addition to the video baseband signal, the multiplex signal can be extracted without orthogonal distortion by performing filtering and synchronous detection using the video carrier wave I2 in the same way as in the processing described above. Furthermore, by adding, for example, 3.0 MHz to the band occupied by current television broadcasting, it is possible in principle to secure a band up to 4.25 MHz through orthogonal modulation, and if 3.0 MHz is simply frequency multiplexed, In comparison, the frequency utilization efficiency can be increased by about 1.4 times or more. Also, compared to the method of modulating another carrier wave with multiplexed signals and frequency multiplexing, when transmitting multiplexed signals by orthogonal modulation of the video carrier wave, only one basic carrier wave is required, and the receiver demodulates the signal. There is no need to reproduce carrier waves separately, which is advantageous in terms of receiving performance of the receiver such as carrier beat and in terms of cost.
発明の効果
以上の説明から明らかなように、映像信号で搬送波を残
留側波帯振幅変調したテレビジョン信号と、前記映像信
号とは異なる多重信号で位相の異なる搬送波を振幅変調
した信号とを合成することにより、現行のテレビジョン
放送と共に別の信号を多重伝送することかできる。そし
て現行のテレビジョン受信機で受信した場合も妨害を殆
ど与えず両立性がある。また専用の受信機では多重した
信号を直交ひずみなく取り出すことができ、電波資源の
有効利用という観点からしても非常に効果がある。Effects of the Invention As is clear from the above explanation, a television signal in which a carrier wave is amplitude-modulated with residual sidebands using a video signal is synthesized with a signal in which a carrier wave having a different phase is amplitude-modulated with a multiplexed signal different from the video signal. By doing so, it is possible to multiplex transmit another signal together with the current television broadcast. It is also compatible with current television receivers, with almost no interference. Furthermore, a dedicated receiver can extract multiplexed signals without orthogonal distortion, which is very effective from the standpoint of effective use of radio wave resources.
第１図（ａ）は、本発明の一実施例における現行テレビ
ジョン方式における残留側波帯振幅変調されたテレビジ
ョン信号のスペクトル図、第１図（ｂ）、第１図（Ｃ）
、第１図（ｄ）は第１図（ａ）で示した信号とは別の信
号で変調し帯域制限したスペクトル図、第１図（ｅｌは
第１図（ｄｉで示した信号を第１図（ａｌの信号に多重
したスペクトル図、第２図は本発明の一実施例における
送信側でのテレビジョン信号処理方法を示すブロック図
、第３図（ａｌ、第３図（ｂ）は多重信号復調時のスペ
クトル図およびベクトル図、第３図ｆｃ）は本発明の一
実施例における多重信号を復調するテレビジョン受信機
のブロック図、第４図（ａｌは映像同期検波をおこなっ
ている現行のテレビジョン受信機のブロック図、第４図
（ｂ）、第４図（Ｃ）は現行のテレビジョン受信機の同
期検波時のスペクトル図およびベクトル図、第５図はＮ
ＴＳＣ方式のテレビジョン信号を時間周波数ｆ、と垂直
周波数ｆ２の２次元平面で示したスペクトル図である。
５．３８・・・・・・移相器、３３．４３・・・・・・
映像中間周波フィルタ、８・・・・・・第２フイルタ、
３７・・・用フィルタ。
代理人の氏名 弁理士 中尾敏男 はか１名＋８Ｊ（Ｃ
＋ 、Ｊ。
２Ｐ２Ｐｔ
１）ＫＩＫ ［ＭＨｚＪ 周オ＆ｆｈ
Ｈｚ］ 周ス歓［ｈｎｔｌＩｅ）
−４２５〜１ｊ５０ １．２５ バａ
４ｒ ｌ１）１敗（Ｍ＋工］第２図
＋（ＩＪ Ｓ−者声搬還濃
Ｊ）
第３図
第４図
ＩＱ）
／
工巨−映像徽遂戟
霞５ 図 １
ｆ２
「ｌ−眸間用液歇
ｆｔ−皇直周液敷
Ｃ−１！信予
γ−輝漬層号
号ｃ−Ｉ！ ！’Ｊ ＊送旋FIG. 1(a) is a spectrum diagram of a television signal subjected to vestigial sideband amplitude modulation in the current television system according to an embodiment of the present invention, FIG. 1(b), FIG. 1(C)
, Fig. 1(d) is a spectrum diagram modulated with a signal different from the signal shown in Fig. 1(a) and band-limited. Figure 2 is a block diagram showing a television signal processing method on the transmitting side in an embodiment of the present invention, Figure 3 is a spectrum diagram multiplexed with the signal of The spectrum diagram and vector diagram at the time of signal demodulation, Fig. 3 fc) is a block diagram of a television receiver that demodulates multiplexed signals in an embodiment of the present invention, and Fig. 4 (al is a current model that performs video synchronous detection). 4(b) and 4(C) are spectrum diagrams and vector diagrams of current television receivers during synchronous detection, and
FIG. 2 is a spectrum diagram showing a TSC television signal on a two-dimensional plane with a temporal frequency f and a vertical frequency f2. 5.38... Phase shifter, 33.43...
Video intermediate frequency filter, 8...second filter,
Filter for 37... Name of agent: Patent attorney Toshio Nakao, 1 person + 8J (C
+, J. 2P2Pt 1) KIK [MHzJ Shuo & fh
Hz] Shuan [hntlIe) -425~1j50 1.25 Ba
4r l1) 1 loss (M + engineering) Fig. 2 + (IJ S - person's voice transfer thick J) Fig. 3 Fig. 4 IQ) / Engineering giant - video image succeeding haze 5 Fig. 1 f2 "l - photo Liquid switch ft-King Jizhu liquid bed C-1!Shinyo γ-Keizuke layer number c-I!!'J *Transfer
Claims (6)
テレビジョン信号と、前記第１搬送波と同一周波数でか
つ位相が異なる第２搬送波とを、前記映像信号とは異な
る多重信号で変調した信号とを合成したことを特徴とす
るテレビジョン信号処理方法。(1) A television signal in which a first carrier wave is vestigial sideband amplitude modulated with a video signal, and a second carrier wave that has the same frequency as the first carrier wave but has a different phase are modulated with a multiplexed signal different from the video signal. A television signal processing method characterized in that the television signal processing method is characterized in that the television signal processing method is characterized in that the signals are synthesized.
記多重信号で両側波帯振幅変調した信号であることを特
徴とする特許請求の範囲第（１）項記載のテレビジョン
信号処理方法。(2) The television signal processing method according to claim (1), wherein the signal modulated by the multiplexed signal is a signal obtained by modulating the amplitude of the second carrier wave with both sidebands and the multiplexed signal. .
記多重信号で単側波帯振幅変調した信号であることを特
徴とする特許請求の範囲第（１）項記載のテレビジョン
信号処理方法。(3) The television signal processing according to claim (1), wherein the signal modulated by the multiplexed signal is a signal obtained by single-sideband amplitude modulation of the second carrier wave by the multiplexed signal. Method.
記多重信号で残留側波帯振幅変調した信号であることを
特徴とする特許請求の範囲第（１）項記載のテレビジョ
ン信号処理方法。(4) The television signal processing according to claim (1), wherein the signal modulated by the multiplexed signal is a signal obtained by modulating the residual sideband amplitude of the second carrier wave by the multiplexed signal. Method.
記多重信号で両側波帯振幅変調し、前記第１または第２
搬送波周波数で半分に減衰し、前記第１または第２搬送
波周波数に関して奇対称な振幅特性を有するナイキスト
フィルタにより残留側波帯にした信号であることを特徴
とする特許請求の範囲第（１）項記載のテレビジョン信
号処理方法。(5) The signal modulated by the multiplexed signal performs double side band amplitude modulation on the second carrier wave by the multiplexed signal, and the signal modulated by the first or second carrier wave.
Claim (1) characterized in that the signal is attenuated by half at a carrier frequency and made into a vestigial sideband by a Nyquist filter having an amplitude characteristic that is oddly symmetrical with respect to the first or second carrier frequency. The television signal processing method described.
号で変調した信号と前記テレビジョン信号を合成した信
号を、直交ひずみを除去するフィルタで帯域制限し、同
期検波することにより復調されることを特徴とする特許
請求の範囲第（１）項記載のテレビジョン信号処理方法
。(6) The multiplexed signal different from the video signal is demodulated by band-limiting a signal obtained by combining the signal modulated by the multiplexed signal and the television signal with a filter that removes orthogonal distortion, and performing synchronous detection. A television signal processing method according to claim (1), characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62325877A JPH01168191A (en) | 1987-12-23 | 1987-12-23 | Television signal processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62325877A JPH01168191A (en) | 1987-12-23 | 1987-12-23 | Television signal processing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01168191A true JPH01168191A (en) | 1989-07-03 |
Family
ID=18181613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62325877A Pending JPH01168191A (en) | 1987-12-23 | 1987-12-23 | Television signal processing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01168191A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0352390A (en) * | 1989-07-08 | 1991-03-06 | Samsung Electron Co Ltd | Phase synchronous loop type 90 degree phase shift modulating and demodulating method and circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6315589A (en) * | 1986-07-08 | 1988-01-22 | Toshiba Corp | Picture signal transmission system |
| JPS63311897A (en) * | 1987-06-13 | 1988-12-20 | Pioneer Electronic Corp | Television system |
-
1987
- 1987-12-23 JP JP62325877A patent/JPH01168191A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6315589A (en) * | 1986-07-08 | 1988-01-22 | Toshiba Corp | Picture signal transmission system |
| JPS63311897A (en) * | 1987-06-13 | 1988-12-20 | Pioneer Electronic Corp | Television system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0352390A (en) * | 1989-07-08 | 1991-03-06 | Samsung Electron Co Ltd | Phase synchronous loop type 90 degree phase shift modulating and demodulating method and circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4907218A (en) | Multiplex signal processing apparatus | |
| US5036386A (en) | Television signal processing apparatus | |
| JPH01168191A (en) | Television signal processing method | |
| JP2692157B2 (en) | Television signal processing method and television signal processing device | |
| JP2658021B2 (en) | Television signal processing method | |
| JPS6336692A (en) | Television signal synthesizer | |
| JP2529217B2 (en) | Television signal decoding device | |
| JPS6336691A (en) | Television signal decoder | |
| JPH01303986A (en) | Television signal processing method | |
| JPS6354084A (en) | Television signal processor | |
| JP2715407B2 (en) | Television signal processing method | |
| JPS6319989A (en) | Processing method for television signal | |
| JPS6386983A (en) | Processing method for high definition television signal | |
| JPS6354085A (en) | Television signal receiver | |
| JPS6354087A (en) | Television signal synthesizer | |
| JP2506957B2 (en) | Multiplex television signal processor | |
| JPS6386988A (en) | Processing method for television signal | |
| JPS63105586A (en) | Television signal processing method | |
| JPS6336690A (en) | Television signal processing unit | |
| JPS6336693A (en) | Television signal synthesizer | |
| JPH0744695B2 (en) | High-definition television signal processing method | |
| JPS63240279A (en) | Television signal processing method | |
| JPS63240276A (en) | Television signal demodulator | |
| JPS63240280A (en) | Television signal synthesizer | |
| JPS6386985A (en) | Processing method for high definition television signal |