JPS6083411A - Emphasis and deemphasis system using band-pass filter - Google Patents

Emphasis and deemphasis system using band-pass filter

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Publication number
JPS6083411A
JPS6083411A JP58190747A JP19074783A JPS6083411A JP S6083411 A JPS6083411 A JP S6083411A JP 58190747 A JP58190747 A JP 58190747A JP 19074783 A JP19074783 A JP 19074783A JP S6083411 A JPS6083411 A JP S6083411A
Authority
JP
Japan
Prior art keywords
emphasis
filter
band
deemphasis
band components
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
Application number
JP58190747A
Other languages
Japanese (ja)
Inventor
Tatsuo Chono
蝶野　辰夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP58190747A priority Critical patent/JPS6083411A/en
Publication of JPS6083411A publication Critical patent/JPS6083411A/en
Pending legal-status Critical Current

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  • Filters And Equalizers (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

PURPOSE:To decrease the degree of a filter for the removal of out-band components which is required for a device by composing an emphasis and a deemphasis circuit of secondary BPFs. CONSTITUTION:A signal inputted from a modulation input terminal 1 is passed through an HPF2 and an LPF3 to remove out-band components, and emphasis is placed according to the characteristics of the slope part of the secondary BPF4. Consequently, the output from a modulation output terminal 5 is sent to an FM radio modulator which is not shown in a figure. Similarly, deemphasis is placed on an FM modulation input from a modulation input terminal 6 according to the characteristics of the slope part of a secondary BPF7 and out-band components are removed by an LPF8 and an HPF9 to obtain a demodulation output at a demodulation output terminal 10. Thus, a modulating and a demodulating circuit are both constituted simply of the HPFs and LPFs, and secondary BPFs.

Description

【発明の詳細な説明】 〔発明のオリ用分野〕 本発明は、エフ７７シス、ティエンファシス特性ｔもだ
せたバンドパスフィルタを実現する方法に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Original Field of the Invention] The present invention relates to a method for realizing a bandpass filter that also exhibits F77 system and tie emphasis characteristics t.

〔発明の背景〕[Background of the invention]

エンファシス、ティエンファシスｖ特ａ’ｖｉるため、
第１図に示す抵抗及びコンデンサを用いた、微分、及び
積分回路を作’７．６ｄＢ７０ＣＴで変化する部分の特
性を利用して実現していた。Emphasis, tie-emphasis v special a'vi,
A differential and integral circuit using the resistor and capacitor shown in Fig. 1 was realized by utilizing the characteristics of the part that changes at 7.6 dB and 70 CT.

この方法によれば第２図に示すごとく、必要とされる帯
域α、ｂ以外の成分まで、６ｑρＣＴ近く変化するため
、帯域外成分を除去する。ためのフィルタに次数の高い
ものを必要とした。According to this method, as shown in FIG. 2, components other than the required bands α and b change by nearly 6qρCT, so the out-of-band components are removed. A high-order filter was required for this purpose.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、エンファシス、ティエンファシス回路
をＳ２次のバンドパスフィルタで作成することにより、
装置に必要とされる帯域外成分を除去するためのフィル
タの次数を軽減することにある。The purpose of the present invention is to create an emphasis and tie-emphasis circuit using an S2nd-order bandpass filter.
The purpose of the present invention is to reduce the order of a filter required for the device to remove out-of-band components.

〔発明の概要〕[Summary of the invention]

２次バンドパスフィルタは、中心周波数の上下の周波数
におい工１１６ｄＢ７’ＯＣＴの特性を得ることができ
この特性Ｖ７ＦＵ用すれば、使用帯域外周波数におい工
、微分及び積分回路を用いる場合に比べ、　１２ｃＬＢ
１０ＣＴ分のだけ、帯域を除去するフィルタの次数を減
少させることができる。The secondary band-pass filter can obtain a characteristic of 116 dB7'OCT for frequencies above and below the center frequency.If this characteristic V7FU is used, compared to the case of using a frequency filter outside the band used, a differential and an integral circuit, it will be 12 cLB.
The order of the filter that removes the band can be reduced by 10 CT.

〔発明の実施例〕[Embodiments of the invention]

以下本発明の一実施例を第３図及び第４図により説明す
る。第３囚の変調入力端子１より入力された＠−号はバ
イパスフィルタ２及び−一パスフイルタ３により帯域外
成分を除去され、２次バンドパスフィルタ４の傾斜部の
特性によりエンファシスがかげられる。すなわち、第４
図に示すようなバンドパスフィルタの特性であるαの部
分乞使用する。以上により変調出力端子５からの出力は
ＦＭ無線変調器に出力される。An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. The @- signal input from the third modulation input terminal 1 has out-of-band components removed by the bypass filter 2 and the -1 pass filter 3, and the emphasis is reduced by the characteristics of the slope of the secondary band pass filter 4. That is, the fourth
A part of α, which is a characteristic of a bandpass filter as shown in the figure, is used. As described above, the output from the modulation output terminal 5 is output to the FM radio modulator.

同様に、第３図に示す変調入力端子６より入力されるＦ
Ｍ復調入力は２次バンドパスフィルタ７の特性によりテ
ィエンファシスがかケラれ。Similarly, F input from the modulation input terminal 6 shown in FIG.
The M demodulated input has vignetting due to the characteristics of the secondary bandpass filter 7.

ローパスフィルタ８及びバイパスフィルタ９により帯域
外成分を除去し、復調出力端子１０より復調出力として
出力される。このディエンファシスの特性は第４図に示
すようなバンドパスフィルタのｂの部分を使用する。Out-of-band components are removed by a low-pass filter 8 and a bypass filter 9, and the signal is output as a demodulated output from a demodulation output terminal 10. This de-emphasis characteristic uses part b of a bandpass filter as shown in FIG.

このように変復調回路共バイパスおまひａ−バスフィル
タと２次バンドパスフィルタとで簡単に構成できる。In this way, both the modulation and demodulation circuits can be easily configured with the bypass Omahi a-bus filter and the secondary bandpass filter.

〔発明の効果〕 不発明によれば、送信及び受信する信号の帯域外成分は
、　６ｃＬＢ）１０ＣＴの傾斜で、除去されるため、エ
ンファシスティエンファシス回路の前段及び後段に付く
ローパス及びノ１イパスフィルタの次数を削減できる。[Effect of the invention] According to the invention, the out-of-band components of the transmitted and received signals are removed with a slope of 6cLB)10CT, so that the low-pass and low-pass filters installed before and after the emphasis circuit can be removed. The order of can be reduced.

エンファシス、ティエンファシス回路を図１に示す回路
で構成、又図２の１及び２に示す６ｃｔＢ、１０ＣＴの
傾斜部音使用するとすれば、２ＩＳ：発明の場合は、前
段及び後段のローパス、バイパスフィルタの特性は１２
　ｃｔＢ、ＪＯＣＴ　タは傾斜が少７Ｚ　（てよい。す
ｌ【わち、次数の少ないフィルタですみ、回路素子の減
少につながる６If the emphasis and tie-emphasis circuits are configured with the circuits shown in Figure 1, and if the 6ctB and 10CT slope sounds shown in Figures 1 and 2 are used, then 2IS: In the case of the invention, the low-pass and bypass filters in the front and rear stages are used. The properties of are 12
ctB, JOCT type has a small slope.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は、従来使用さｎ１い１こ、エンファシス、ティ
エンファシス回路の構成図、ａ２図＋！その特性図、第
３図は不発明の一実施例である変調オよヒ復調部のエン
ファシス、ティエンファシス回路の構成図、椰４図はバ
ンドパスフィルタの特性図である。 １　：　ｆＵＪＡ入力端子２　：バイパスフィルタ３：
Ｑ−）くスフイルタ ４：２次バンドパスフィルタによるエン７７シスＵ路 ５：変調出力端子　６：復調入力端子 ７：２次バンドパスフィルタにょ−るティエンファシス
回路 ８：ローパスフィルタ９：バイパスフィルタ１０：復調
出力端子 代理人弁理士　高　橋　明　夫 第　１　図 第４図Figure 1 is a block diagram of the conventionally used n1, emphasis, and tie emphasis circuits, and Figure A2+! FIG. 3 is a configuration diagram of the emphasis and tie-emphasis circuits of the modulation/auto-demodulation section according to an embodiment of the present invention, and FIG. 4 is a characteristic diagram of the bandpass filter. 1: fUJA input terminal 2: Bypass filter 3:
Q-) Filter 4: En77 system U path using a 2nd order band pass filter 5: Modulation output terminal 6: Demodulation input terminal 7: 2nd order band pass filter Emphasis circuit 8: Low pass filter 9: Bypass filter 10 : Demodulation output terminal representative patent attorney Akio Takahashi Figure 1 Figure 4

Claims (1)

【特許請求の範囲】[Claims] 必要なエンンアシス、ティエンファシス特性を、２次バ
ンドパスフィルタで実現することを特徴とする。バンド
パスフィルタによるエン７アシス、ティエンファシス方
式。It is characterized in that the necessary emphasis and emphasis characteristics are realized by a second-order bandpass filter. Emphasis and tie-emphasis method using a bandpass filter.
JP58190747A 1983-10-14 1983-10-14 Emphasis and deemphasis system using band-pass filter Pending JPS6083411A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58190747A JPS6083411A (en) 1983-10-14 1983-10-14 Emphasis and deemphasis system using band-pass filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58190747A JPS6083411A (en) 1983-10-14 1983-10-14 Emphasis and deemphasis system using band-pass filter

Publications (1)

Publication Number Publication Date
JPS6083411A true JPS6083411A (en) 1985-05-11

Family

ID=16263071

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58190747A Pending JPS6083411A (en) 1983-10-14 1983-10-14 Emphasis and deemphasis system using band-pass filter

Country Status (1)

Country Link
JP (1) JPS6083411A (en)

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