JPH0656967B2 - Emphasis method - Google Patents
Emphasis methodInfo
- Publication number
- JPH0656967B2 JPH0656967B2 JP61013670A JP1367086A JPH0656967B2 JP H0656967 B2 JPH0656967 B2 JP H0656967B2 JP 61013670 A JP61013670 A JP 61013670A JP 1367086 A JP1367086 A JP 1367086A JP H0656967 B2 JPH0656967 B2 JP H0656967B2
- Authority
- JP
- Japan
- Prior art keywords
- emphasis
- frequency
- transmission
- signal
- frequency component
- 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.)
- Expired - Lifetime
Links
Landscapes
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、広帯域情報信号の周波数変調伝送に際し、高
周波域の伝送ノイズ特性を改善するために、伝送の前後
に送受相対応して高周波域成分を相対的に増減させるノ
ンリニアエンファシスを広帯域情報信号に施すエンファ
シス方式に関し、特に、ノンリニアエンファシスによる
高域信号レベルの相対的増大に伴って発生し易い隣接チ
ャネルに対する混信を、画像コントラストの大勢を決め
る低・中域の高レベル信号による周波数変調スペクトル
成分の伝送帯域外逸脱に伴う隣接チャネル混信および自
チャネルに発生する信号成分の欠除によるトランケーシ
ョンノイズと併せて軽減し得るようにしたものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a high frequency range corresponding to transmission / reception phases before and after transmission in order to improve transmission noise characteristics in a high frequency range during frequency modulation transmission of a wide band information signal. Concerning the emphasis method that applies non-linear emphasis that relatively increases / decreases the components to the wide band information signal, especially the interference of the adjacent channel that is likely to occur due to the relative increase of the high frequency signal level due to the non-linear emphasis determines the majority of the image contrast. It is possible to reduce the interference with adjacent channel due to deviation of the frequency modulation spectrum component due to the high level signal in the low / middle range from the transmission band and the truncation noise due to lack of the signal component generated in the own channel.
（従来の技術） 従来、例えば超広帯域の高品位テレビジョン信号を帯域
圧縮して周波数変調伝送するためにフレーム間およびフ
イールド間のオフセットサブサンプリングを併用する多
重サブサンプル伝送方式、すなわち、いわゆるMUSE方
式、特に、画像の動き補正について改良したMUSE方式な
どによる広帯域情報信号の周波数変調伝送に際し、高周
波域において良好な伝送ノイズ特性を確保するために、
例えば、本願人の出願に係る特開昭52−108711号公報な
どによる従来慣用のノンリニアエンファシスを施して高
周波域信号成分を相対的に強調すると、周波数変調スペ
クトル成分が隣接チャネルまで拡がって混信妨害を生じ
易くなる。(Prior Art) Conventionally, for example, a multi-subsample transmission method using offset subsampling between frames and fields to frequency-modulate and transmit an ultra-wide band high-definition television signal, that is, a so-called MUSE method In order to ensure good transmission noise characteristics in the high frequency range, especially when frequency-modulating and transmitting wideband information signals by the MUSE method, etc., which has been improved for motion compensation of images
For example, when the conventional non-linear emphasis according to Japanese Patent Application Laid-Open No. 52-108711, etc., which is filed by the applicant of the present application, is applied to relatively emphasize the high frequency range signal component, the frequency modulation spectrum component spreads to the adjacent channel and causes interference. It tends to occur.
周波数変調伝送におけるかかる隣接チャネル混信を軽減
してその混信保護比を改善するには、周波数変調搬送波
の偏波面を隣接チャネル間において互いに直交させ、も
しくは、互いに逆回転させ、あるいは、受信側におい
て、伝送過程で生じたAM成分にヒルベルト変換を施して
受信FM復調出力信号から差引くなどの混信軽減対策も従
来用いられていた。In order to reduce such adjacent channel interference in frequency modulation transmission and improve the interference protection ratio, the polarization planes of the frequency modulated carrier waves are made orthogonal to each other between adjacent channels, or mutually rotated, or at the receiving side, Interference mitigation measures such as applying Hilbert transform to the AM component generated in the transmission process and subtracting from the received FM demodulation output signal have also been used conventionally.
（発明が解決しようとする問題点） しかしながら、混信軽減対策としては、隣接チャネルま
で拡がった信号波成分について上述のように混信保護比
を増大させるよりも、混信成分の拡がり自体を抑制する
方が望ましい。したがって、周波数変調伝送において高
レベル信号による周波数変調スペクトル成分の伝送帯域
外逸脱に伴う信号波成分の欠如乃至減衰により伝送チャ
ネル内に生ずるトランケーションノイズを軽減するため
のエンファシス方式自体の改良が望まれる。(Problems to be Solved by the Invention) However, as a measure for reducing interference, it is better to suppress the spread of the interference component than to increase the interference protection ratio as described above for the signal wave component spread to the adjacent channel. desirable. Therefore, in frequency modulation transmission, improvement of the emphasis system itself for reducing truncation noise generated in the transmission channel due to lack or attenuation of the signal wave component due to deviation of the frequency modulation spectrum component due to the high level signal from the transmission band is desired.
本発明の目的は、上述した従来の問題点を解決し、広帯
域情報信号の周波数変調伝送に際し、高域信号レベルを
相対的に増減させて周波数変調三角ノイズに対する信号
対ノイズ比を改善する従来方式の標準的なノンリニアエ
ンファシス回路はそのまま温存し、その信号対ノイズ比
の改善に伴って発生し易い隣接チャネル混信妨害を、高
レベル号による周波数変調スペクトル成分の過大な拡が
りに基づいて発生し、縦方向エッジ部などで目につくト
ランケーションノイズと併せて軽減するために、常時信
号振幅が大きく、周波数変調ノイズが小さい低周波数域
の信号レベルを相対的に低減するようにした他のエンフ
ァシス回路を新たに付加することにより、設計製作容易
にエンファシス特性を改良したエンファシス方式を提供
することにある。It is an object of the present invention to solve the above-mentioned conventional problems and improve the signal-to-noise ratio for frequency modulation triangular noise by relatively increasing or decreasing the high frequency signal level during frequency modulation transmission of a wideband information signal. The standard non-linear emphasis circuit of is preserved as it is, and adjacent channel interference which is likely to occur due to the improvement of its signal-to-noise ratio is generated based on the excessive spread of the frequency modulation spectrum component due to the high level signal. In order to reduce the truncation noise that is noticeable at the direction edges, etc., a new emphasis circuit has been added that relatively reduces the signal level in the low frequency range where the signal amplitude is always large and the frequency modulation noise is small. The purpose of the present invention is to provide an emphasis system in which the emphasis characteristic is improved by facilitating the design and manufacture.
（問題点を解決するための手段） 上述の目的を達成するためになした本発明の基本構想は
つぎの３点からなっている。(Means for Solving Problems) The basic concept of the present invention for achieving the above-mentioned object is composed of the following three points.
(1) 高品位テレビジョン信号等の広帯域情報信号をそ
のベースバンド上で処理して隣接チャネルへの混信を軽
減する。(1) A wideband information signal such as a high-definition television signal is processed on its baseband to reduce interference with adjacent channels.
(2) 周波数変調伝送における伝送ノイズによる信号対ノ
イズ特性の劣化を軽減するために広帯域情報信号に施す
従来のノンリニアエンファシスに他の態様のエンファシ
スを併用することにより、隣接チャネルへの混信妨害を
軽減するとともに、トランケーションノイズ軽減の作用
効果をも増大させる。(2) Interference interference to adjacent channels is reduced by combining conventional non-linear emphasis applied to wideband information signals with other types of emphasis to reduce the deterioration of signal-to-noise characteristics due to transmission noise in frequency modulation transmission. In addition, the effect of reducing truncation noise is also increased.
(3) 以上の対策により伝送チャネル内のトランケーシ
ョンノイズに対するマージンの増大に応じてエンファシ
スを施したベースバンド信号のレベルを増大させ、高周
波域における信号対ノイズ特性を一層改善し得るように
する。(3) With the above measures, the level of the baseband signal subjected to emphasis is increased according to the increase in the margin for truncation noise in the transmission channel, and the signal-to-noise characteristic in the high frequency range can be further improved.
かかる基本構想に基づく本発明エンファシス方式は、広
帯域情報信号の周波数変調伝送に際し、伝送の前後に送
受相対応して高域周波数成分を低中域周波数成分に対し
相対的に増減させるノンリニアエンファシスを前記広帯
域情報信号に施すエンファシス方式において、伝送の前
後に送受対応して、基準として保持する中域周波数成分
に対し、低域周波数成分を前記ノンリニアエンファシス
における高域周波数成分の当該基準として保持する中域
周波数成分に対する増減とは逆極性に増減させる低周波
域エンファシスを前記ノンリニアエンファシスに縦続し
て前記広域情報信号に施すことを特徴とするものであ
る。The emphasis system of the present invention based on such a basic concept is characterized by the non-linear emphasis for increasing / decreasing a high frequency component relative to a low / mid frequency component in response to transmission / reception phases before and after transmission in frequency modulation transmission of a wideband information signal. In the emphasis method applied to a wideband information signal, the mid-range frequency component to be transmitted and received before and after transmission, and the mid-range frequency component to be retained as a reference, the low-frequency component is retained as the reference of the high-frequency component in the non-linear emphasis. The wide-range information signal is characterized in that low-frequency region emphasis, which is increased / decreased in polarity opposite to that of the frequency component, is cascaded to the non-linear emphasis to the wide-range information signal.
（作 用） 標準的ノンリニアエンファシス回路に他のエンファシス
回路を縦続させて性能を改善するようにしたエンファシ
ス方式の従来例が、伝送信号の信号レベルに応じ、低レ
ベル信号時には高域強調特性を標準エンファシス特性に
上乗せするようにしたのとは異なり、上述の特徴を有す
る本発明方式によるエンファシスを施して広帯域情報信
号の周波数変調伝送を行なえば、従来、周波数変調スペ
クトル成分の過大な拡がりによって生じ易かった隣接チ
ャネル混信妨害を軽減するとともに、伝送帯域外信号成
分の欠落によって伝送チャネル内に発生するトランケー
ションノイズも大幅に軽減することができる。(Working) The conventional example of the emphasis method, in which other emphasis circuits are cascaded to the standard non-linear emphasis circuit to improve the performance, the high-frequency emphasis characteristic is standardized for low-level signals depending on the signal level of the transmission signal. Unlike the addition to the emphasis characteristic, if the frequency modulation transmission of the wideband information signal is carried out by applying the emphasis according to the method of the present invention having the above-mentioned characteristics, it is apt to occur due to the excessive spread of the frequency modulation spectrum component in the past. It is possible to reduce interference with adjacent channel interference and also to significantly reduce truncation noise generated in the transmission channel due to the loss of signal components outside the transmission band.
（実施例） 以下に図面を参照して実施例につき本発明を詳細に説明
する。(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.
まず、本発明方式によるエンファシスを広帯域情報信号
に施す回路装置の基本構成を第１図(a)，(b)に示し、そ
の周波数レスポンス特性の例を第２図(a1)〜(c1)および
(a2)〜(c2)に示す。First, FIGS. 1 (a) and 1 (b) show the basic configuration of a circuit device for applying emphasis to a wideband information signal according to the present invention. Examples of frequency response characteristics are shown in FIGS. 2 (a1) to (c1) and FIG.
Shown in (a2) to (c2).
第１図示の基本構成において、１は、広帯域情報信号の
ベースバンドにおける高周波域レスポンスを従来と同様
に相対的に増減させるノンリニアエンファシス回路であ
り、送信側においては第２図(a1)に示すような周波数レ
スポンス特性を有するノンリニアプリエンファシス回路
となり、受信側においては第２図(a2)に示すような周波
数レスポンス特性を有するノンリニアデエンファシス回
路となる。また、２は、広帯域情報信号のベースバンド
における低周波域レスポンスを、ノンリニアエンファシ
ス回路１とは逆極性に相対的に増減させる低周波域エン
ファシス回路であり、送信側においては第２図(b1)に示
すような周波数レスポンス特性を有する低周波域プリエ
ンファシス回路となり、受信側においては第２図(b2)に
示すような周波数レスポンス特性を有する低周波域デエ
ンファシス回路となる。In the basic configuration shown in FIG. 1, reference numeral 1 is a non-linear emphasis circuit that relatively increases / decreases the high frequency response in the base band of a wide band information signal as in the conventional case, and as shown in FIG. 2 (a1) on the transmitting side. The non-linear pre-emphasis circuit has various frequency response characteristics, and the receiving side has a non-linear de-emphasis circuit having frequency response characteristics as shown in FIG. 2 (a2). Reference numeral 2 is a low frequency range emphasis circuit that relatively increases or decreases the low frequency range response in the base band of the wide band information signal in the opposite polarity to the non-linear emphasis circuit 1. At the transmitting side, FIG. It becomes a low frequency range pre-emphasis circuit having a frequency response characteristic as shown in (1) and a low frequency range de-emphasis circuit having a frequency response characteristic as shown in FIG. 2 (b2) on the receiving side.
本発明方式のエンファシス回路装置は、かかるノンリニ
アエンファシス回路１と低周波域エンファシス回路２と
を縦続接続してそれぞれの周波数レスポンス特性を加算
し、送信側においては第２図(c1)に示すような総合の周
波数レスポンス特性によるプリエンファシスをベースバ
ンド信号に施すことにより、低周波域に対する高周波域
のレスポンス比を相対的に増大させて伝送チャネル内の
トランケーションノイズ軽減効果を増大させるととも
に、高周波域レスポンスの上限を抑えて隣接チャネルへ
の混信を軽減し得るようにしている。また、第２図（Ｃ
２）は、各エンファシス回路１，２の縦続接続により、
受信側において施すデエンファシスの総合の周波数レス
ポンス特性を示している。In the emphasis circuit device of the present invention, the non-linear emphasis circuit 1 and the low frequency range emphasis circuit 2 are cascade-connected to add their respective frequency response characteristics, and at the transmitting side, as shown in FIG. 2 (c1). By applying pre-emphasis to the baseband signal by the overall frequency response characteristics, the response ratio of the high frequency region to the low frequency region is relatively increased to increase the truncation noise mitigation effect in the transmission channel, and The upper limit is suppressed so that interference with adjacent channels can be reduced. In addition, FIG.
2) is due to the cascade connection of the emphasis circuits 1 and 2,
The total frequency response characteristic of the de-emphasis performed on the receiving side is shown.
なお、ノンリニアエンファシス回路１と低周波域エンフ
ァシス回路２との縦続接続の順序については、第１図
(a)、(b)に示したように任意とすることができ、いずれ
によっても本発明方式エンファシスの作用効果には差が
ない。また、第２図示の周波数レスポンス特性について
は、各エンファシス回路１，２に共通の変曲点を40kHz
程度の中域f2〜f3に設定するのが好適であり、かかる中
域のレスポンスを基準にして高域および低域のレスポン
スを相対的に増減させる。The sequence of cascade connection between the non-linear emphasis circuit 1 and the low-frequency emphasis circuit 2 is shown in FIG.
It may be arbitrary as shown in (a) and (b), and there is no difference in the action and effect of the method emphasis of the present invention. Regarding the frequency response characteristics shown in the second figure, the inflection point common to the emphasis circuits 1 and 2 is 40 kHz.
It is preferable to set the middle frequency range f 2 to f 3 so that the response in the high range and the low range is relatively increased or decreased with reference to the response in the middle range.
さらに、第２図(b1)および(b2)に点線によって示すよう
に、低周波域エンファシス回路２における低周波域レス
ポンスを低減すると同時に周波数域レスポンスを増大さ
せて第２図(c1)および(c2)に示すように総合の周波数レ
スポンス特性による高周波域の信号対ノイズ比をさらに
改善することもできる。Further, as shown by the dotted lines in FIGS. 2 (b1) and (b2), the low frequency response in the low frequency emphasis circuit 2 is reduced and at the same time the frequency response is increased to increase the frequency response in FIG. 2 (c1) and (c2). As shown in (), it is possible to further improve the signal-to-noise ratio in the high frequency range by the overall frequency response characteristic.
（発明の効果） 以上の説明から明らかなように、本発明によれば、広帯
域情報信号の周波数変調伝送における隣接チャネルに対
する混信保護比を従来に比して格段に増大させ得るとと
もに、伝送チャネル内のトランケーションノイズも従来
に比して大幅に軽減させることができる。(Effects of the Invention) As is clear from the above description, according to the present invention, the interference protection ratio for the adjacent channel in the frequency modulation transmission of the wideband information signal can be significantly increased as compared with the conventional one, and the transmission channel The truncation noise of can also be greatly reduced compared to the conventional one.
なお、広帯域情報信号のベースバンドにおける低周波域
レスポンスが相対的に低減するので、そのノイズマージ
ンがそれだけ小さくなるが、本発明方式のエンファシス
を施して周波数変調伝送を行なった再生高品位テレビジ
ョン画像について注意深く観察した結果においても、指
摘し得るほどの影響は全く認められないことを確認して
ある。また、各エンファシス回路１，２に共通の変曲点
を400kHz、エンファシス利得を３dB、伝送帯域を８MHz
とした場合における再生画像の信号対ノイズ比の本発明
方式エンファシス実施による劣化は約0.02dB程度に留ま
った。Since the low frequency response in the baseband of the wideband information signal is relatively reduced, the noise margin is reduced accordingly, but the reproduced high-definition television image subjected to frequency modulation transmission by applying the emphasis of the method of the present invention. It was confirmed that even in the result of careful observation, there was no noticeable effect. The common inflection point of each emphasis circuit 1 and 2 is 400kHz, the emphasis gain is 3dB, and the transmission band is 8MHz.
In such a case, the deterioration of the signal-to-noise ratio of the reproduced image due to the emphasizing method of the present invention was about 0.02 dB.
第１図(a)，(b)は本発明方式によるエンファシス回路装
置の基本構成の例をそれぞれ示すブロック線図、 第２図(a1)，(b1)および(c1)並びに(a2)，(b2)および(c
2)は本発明エンファシス方式におけるノンリニアエンフ
ァシス回路、低周波域エンファシス回路および両者縦続
接続回路の送信側並びに受信側における周波数レスポン
ス特性の例をそれぞれ示す特性曲線図である。 １……ノンリニアエンファシス回路 ２……低周波域エンファシス回路1 (a) and 1 (b) are block diagrams showing an example of a basic configuration of an emphasis circuit device according to the present invention, and FIGS. 2 (a1), (b1) and (c1) and (a2), ( b2) and (c
2) is a characteristic curve diagram showing an example of frequency response characteristics on the transmission side and the reception side of the non-linear emphasis circuit, the low frequency range emphasis circuit, and the cascade connection circuit of both in the emphasis system of the present invention. 1 ... Non-linear emphasis circuit 2 ... Low frequency emphasis circuit
Claims (1)
伝送の前後に送受相対応して高域周波数成分を低中域周
波数成分に対し相対的に増減させるノンリニアエンファ
シスを前記広帯域情報信号に施すエンファシス方式にお
いて、伝送の前後に送受対応して、基準として保持する
中域周波数成分に対し、低域周波数成分を前記ノンリニ
アエンファシスにおける高域周波数成分の当該基準とし
て保持する中域周波数成分に対する増減とは逆極性に増
減させる低周波域エンファシスを前記ノンリニアエンフ
ァシスに縦続して前記広域情報信号に施すことを特徴と
するエンファシス方式。1. In frequency modulation transmission of a wideband information signal,
In the emphasis method that applies non-linear emphasis to the wideband information signal to increase / decrease the high frequency component relative to the low / mid frequency component before and after the transmission, before and after the transmission, as a reference. With respect to the mid-range frequency component to be held, the low-frequency component is increased or decreased in the opposite polarity to the increase or decrease with respect to the mid-frequency component held as the reference of the high-frequency component in the non-linear emphasis to the non-linear emphasis. An emphasis system characterized in that the wide area information signal is applied in cascade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61013670A JPH0656967B2 (en) | 1986-01-27 | 1986-01-27 | Emphasis method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61013670A JPH0656967B2 (en) | 1986-01-27 | 1986-01-27 | Emphasis method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62172825A JPS62172825A (en) | 1987-07-29 |
| JPH0656967B2 true JPH0656967B2 (en) | 1994-07-27 |
Family
ID=11839629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61013670A Expired - Lifetime JPH0656967B2 (en) | 1986-01-27 | 1986-01-27 | Emphasis method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0656967B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02301277A (en) * | 1989-05-15 | 1990-12-13 | Toshiba Corp | Recording processing circuit for video signal |
| JP4857215B2 (en) * | 2007-07-31 | 2012-01-18 | Ｎｔｎ株式会社 | Driving force forward / reverse switching device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5412714A (en) * | 1977-06-29 | 1979-01-30 | Matsushita Electric Ind Co Ltd | Recorder-reproducer |
-
1986
- 1986-01-27 JP JP61013670A patent/JPH0656967B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62172825A (en) | 1987-07-29 |
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