JPS6141472B2 - - Google Patents
Info
- Publication number
- JPS6141472B2 JPS6141472B2 JP53130783A JP13078378A JPS6141472B2 JP S6141472 B2 JPS6141472 B2 JP S6141472B2 JP 53130783 A JP53130783 A JP 53130783A JP 13078378 A JP13078378 A JP 13078378A JP S6141472 B2 JPS6141472 B2 JP S6141472B2
- Authority
- JP
- Japan
- Prior art keywords
- video
- signal
- modulator
- phase
- modulated
- 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
Links
- 238000010586 diagram Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000005236 sound signal Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
Landscapes
- Picture Signal Circuits (AREA)
- Television Receiver Circuits (AREA)
Description
【発明の詳細な説明】
本発明は、FM―FM方式のテレビジヨン音声
多重放送をインターキヤリア受像機で受信した場
合、音声副信号に生ずるバズノイズを軽減するた
めに、テレビジヨン送信機に装備するバズ補償装
置に関する。[Detailed Description of the Invention] The present invention provides equipment for a television transmitter to reduce buzz noise that occurs in audio sub-signals when an FM-FM television audio multiplex broadcast is received by an intercarrier receiver. The present invention relates to a buzz compensator.
周知の如く、FM―FM方式のテレビジヨン音
声多重放送用のテレビジヨン送信装置の音声信号
入力は、第１図に示すように、０〜15KHzの周波
数成分を有する主チヤンネル信号と、別個の音声
信号（副音声信号）により、映像水平同期信号周
波数Fhの２倍の周波数2Fhの搬送波をFMした副
チヤンネル信号と、Fhの3.5倍の周波数3.5Fhの
制御信号とから構成され、音声送信機出力は、音
声搬送波がこの複合信号で周波数変調FMされて
いる。 As is well known, the audio signal input of a television transmitter for FM-FM television audio multiplex broadcasting consists of a main channel signal having a frequency component of 0 to 15 KHz and a separate audio signal, as shown in Figure 1. The signal (sub-audio signal) consists of a sub-channel signal that is FM of a carrier wave with a frequency of 2Fh, which is twice the video horizontal synchronization signal frequency Fh, and a control signal with a frequency of 3.5Fh, which is 3.5 times Fh, and the audio transmitter output. The audio carrier wave is frequency modulated FM with this composite signal.
一方映像送信機出力は、映像搬送波Fcvが映像
信号Svで振幅変調AMされているが、搬送波が、
映像送信系において生じるAM―PM変換などに
よる映像信号での位相変調成分を含むと、インタ
ーキヤリア方式の受像機で受信した場合には、イ
ンターキヤリアノイズ、バズ音を発生する。 On the other hand, in the video transmitter output, the video carrier wave Fcv is amplitude modulated with the video signal Sv, but the carrier wave is
If the video signal contains phase modulation components due to AM-PM conversion, etc. that occur in the video transmission system, intercarrier noise and buzz will occur when received by an intercarrier receiver.
特に、FM―FM方式によるテレビジヨン音声
多重放送の場合、映像送信機搬送波Fcvが水平同
期信号周波数の２倍の周波数2Fhの成分で位相変
調されると、インターキヤリア受像機で受信した
場合、音声出力に、第１図に示す音声副チヤンネ
ル信号に不要成分として混入し、音声多重復調器
で副音声信号をとり出した場合、副チヤンネル信
号の2Fhの周波数の搬送波との干渉によるバズノ
イズが生じる。 In particular, in the case of television audio multiplex broadcasting using the FM-FM system, if the video transmitter carrier wave Fcv is phase-modulated with a component of frequency 2Fh, which is twice the horizontal synchronization signal frequency, when received by an intercarrier receiver, the audio When the output is mixed as an unnecessary component in the audio sub-channel signal shown in FIG. 1 and the sub-audio signal is extracted by an audio multiplex demodulator, buzz noise is generated due to interference with the sub-channel signal's carrier wave of frequency 2Fh.
従来、このバズノイズの低減手段として、映像
信号により変調を受ける前の映像搬送波、また
は、変調を受けた後の被変調波を、映像信号でも
つて、前記の映像送信系でのAM―PM変換によ
る位相変調を打消すような位相変調をしておつ
た。第２図はこのような従来のバズ補償装置の一
例を示すもので、映像信号入力端子１に印加され
た映像信号Svは、映像信号分配器２で第１の信
号Sv1と第２の信号Sv2に分配され、第１の信号
Sv1は映像変調器３へ導かれる。第２の信号Sv2
は、遅延回路４を通り、さらにガンマ回路５によ
り補償量に応じた振幅非直線性が与えられた後、
位相変調器６において、搬送波発生器７で発生さ
れた、映像変調を受ける前の搬送波Fcを位相変
調する。したがつて、映像変調器６の出力端子８
に出力される映像被変調波Fcmは補償成分で位
相変調されており、後段において発生するAM―
PM変換などによる位相変調分が補償されている
ことになる。 Conventionally, as a means of reducing this buzz noise, a video carrier wave before being modulated by a video signal, or a modulated wave after being modulated by a video signal, is converted by AM-PM conversion in the video transmission system as described above. I used phase modulation to cancel out the phase modulation. FIG. 2 shows an example of such a conventional buzz compensation device, in which a video signal Sv applied to a video signal input terminal 1 is divided into a first signal Sv 1 and a second signal by a video signal distributor 2. Sv 2 , the first signal
Sv 1 is guided to the video modulator 3. Second signal Sv 2
passes through the delay circuit 4, and is further given amplitude nonlinearity according to the amount of compensation by the gamma circuit 5.
In the phase modulator 6, the carrier wave Fc generated by the carrier wave generator 7 and before being subjected to image modulation is phase-modulated. Therefore, the output terminal 8 of the video modulator 6
The video modulated wave Fcm outputted to is phase-modulated with a compensation component, and the AM-
This means that the phase modulation due to PM conversion etc. has been compensated for.
しかしながら、このような従来のバズ補償装置
では、調整上映像信号周波数帯全域にわたり位相
補償を行なつているので、構成は複雑となる。さ
らに位相変調器によつて生じるAM含有量や、位
相変調器の映像周波数帯のインピーダンス特性な
どにより、映像変調器出力の映像特性に悪影響を
与えるなどの欠点を有している。 However, in such a conventional buzz compensation device, phase compensation is performed over the entire video signal frequency band for adjustment, so the configuration is complicated. Furthermore, it has the disadvantage that the AM content generated by the phase modulator and the impedance characteristics of the video frequency band of the phase modulator adversely affect the video characteristics of the video modulator output.
本発明の目的は、このような従来のバズ補償装
置のもつ欠点を改善した、構成が簡単でかつ映像
出力特性の劣化を生じることのないバズ補償装置
を提供することである。 SUMMARY OF THE INVENTION An object of the present invention is to provide a buzz compensation device that improves the drawbacks of the conventional buzz compensation device, has a simple configuration, and does not cause deterioration of video output characteristics.
本発明のバズ補償装置では、第１図の音声副搬
送波に落込む映像信号に含まれている2Fh成分で
もつて映像装置の変調を受ける前の搬送波、もし
くは被変調波を位相変調することにより、容易に
補償を行うものである。 In the buzz compensation device of the present invention, even the 2Fh component included in the video signal falling into the audio subcarrier shown in FIG. 1 is phase-modulated on the carrier wave or modulated wave before being modulated by the video device. Compensation is easily provided.
第３図は、本発明の一実施例を示すものであ
り、第３図において、映像入力端子１に入力され
た映像信号Svは、従来のものと同様、映像信号
分配器２で第１の信号Sv1と第２の信号Sv2に分
配された後、第１の信号Sv1は映像変調器３に導
かれ第２の信号Sv2は遅延回路４を通し、補償す
べき成分に応じた非直線性を持たせるガンマ
（γ）回路５を通す。このガンマ回路出力から水
平同期周波数の２倍（2Fh）成分のみをバンドパ
スフイルタ９でとり出し、この成分でもつて、搬
送波発生器７で発生された搬送波Fcを位相変調
器６で位相変調するものである。したがつて、映
像被変調波出力端子８の搬送波Fcmは2Fh成分の
みで位相変調されていることとなる。 FIG. 3 shows an embodiment of the present invention. In FIG. 3, the video signal Sv input to the video input terminal 1 is sent to the first video signal distributor 2 as in the conventional one. After being divided into the signal Sv 1 and the second signal Sv 2 , the first signal Sv 1 is guided to the video modulator 3, and the second signal Sv 2 is passed through the delay circuit 4, and the signal is adjusted according to the component to be compensated. It passes through a gamma (γ) circuit 5 that provides nonlinearity. A band pass filter 9 extracts only the twice horizontal synchronizing frequency (2Fh) component from this gamma circuit output, and the phase modulator 6 modulates the phase of the carrier wave Fc generated by the carrier wave generator 7 using this component. It is. Therefore, the carrier wave Fcm of the video modulated wave output terminal 8 is phase-modulated only by the 2Fh component.
第４図は本発明のもう一つの実施例を示したも
のである。すなわち、第３図に示す実施例と異
り、映像変調器３の被変調波出力Fcmを位相変
調器６で第３図に示す実施例と同様な構成で得ら
れた補償の為の2Fh成分で位相変調し、バズの補
償を行うものである。 FIG. 4 shows another embodiment of the invention. That is, unlike the embodiment shown in FIG. 3, the modulated wave output Fcm of the video modulator 3 is converted into a 2Fh component for compensation obtained by the phase modulator 6 with the same configuration as the embodiment shown in FIG. This phase modulates the phase and compensates for the buzz.
上記詳細に説明した如く、本発明はFM―FM
方式のテレビジヨン音声多重放送において、副音
声信号のバズノイズの直接の原因となる2Fh周波
数成分で補償の為の位相変調を行うもので、従来
のバズ補償装置に比較し調整が非常に簡単になる
ばかりでなく、単一の周波数（2Fh）信号で位相
変調する位相変調器を使用すればよく、位相変調
器の回路構成が簡単であり、かつ映像特性に与え
る影響がすくない利点を有する。 As explained in detail above, the present invention provides FM-FM
This system performs phase modulation for compensation using the 2Fh frequency component, which is the direct cause of buzz noise in the sub-audio signal, in television audio multiplex broadcasting, making adjustment much easier than conventional buzz compensation devices. In addition, it is sufficient to use a phase modulator that performs phase modulation with a single frequency (2Fh) signal, which has the advantage that the circuit configuration of the phase modulator is simple and that it has little effect on video characteristics.
第１図はテレビジヨン音声多重放送の複合音声
信号の周波数配置図、第２図は従来のテレビジヨ
ン音声多重放送送信機のバズ補償装置のブロツク
図、第３図は本発明の一実施例のブロツク図、第
４図は本発明の他の実施例のブロツク図である。
１……映像信号入力端子、２……分配器、３…
…映像変調器、４……遅延回路、５……ガンマ回
路、６……位相変調器、７……搬送波発生器、８
……被変調波出力端子、９……バンドパスフイル
タ。
FIG. 1 is a frequency allocation diagram of a composite audio signal for television audio multiplex broadcasting, FIG. 2 is a block diagram of a buzz compensation device for a conventional television audio multiplex broadcast transmitter, and FIG. 3 is a diagram of an embodiment of the present invention. Block Diagram FIG. 4 is a block diagram of another embodiment of the present invention. 1...Video signal input terminal, 2...Distributor, 3...
...Video modulator, 4...Delay circuit, 5...Gamma circuit, 6...Phase modulator, 7...Carrier wave generator, 8
...Modulated wave output terminal, 9...Band pass filter.
Claims (1)
する第１の信号とバズ補償を行うための第２の信
号とに２分配する分配器と、この分配器で分配さ
れた第２の信号を入力とする遅延回路および振幅
非直線回路（ガンマ回路）と、このガンマ回路出
力を入力とするところの、映像水平同期信号周波
数の２倍の周波数を同調周波数とするバンドパス
フイルタと、このバンドパスフイルタの出力を変
調波入力とし、前記映像変調器で変調を受ける前
の映像搬送波、または、前記映像変調器の被変調
波出力を位相変調する位相変調器とを具備したこ
とを特徴とするバズ補償装置。1. A distributor that divides a video input signal into a first signal that is used as a modulation input to a video modulator and a second signal that is used to perform buzz compensation, and a second signal that is distributed by this distributor. A delay circuit and an amplitude non-linear circuit (gamma circuit) which take the output of this gamma circuit as input, and a bandpass filter whose tuning frequency is twice the video horizontal synchronizing signal frequency, and It is characterized by comprising a phase modulator that uses the output of a pass filter as a modulated wave input and phase-modulates a video carrier wave before being modulated by the video modulator or a modulated wave output of the video modulator. Buzz compensator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13078378A JPS5556778A (en) | 1978-10-24 | 1978-10-24 | Buzz compensating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13078378A JPS5556778A (en) | 1978-10-24 | 1978-10-24 | Buzz compensating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5556778A JPS5556778A (en) | 1980-04-25 |
| JPS6141472B2 true JPS6141472B2 (en) | 1986-09-16 |
Family
ID=15042564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13078378A Granted JPS5556778A (en) | 1978-10-24 | 1978-10-24 | Buzz compensating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5556778A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100576108B1 (en) * | 1999-03-20 | 2006-05-03 | 삼성전자주식회사 | DC/DC Convertor for filtering an audible frequency noise |
-
1978
- 1978-10-24 JP JP13078378A patent/JPS5556778A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5556778A (en) | 1980-04-25 |
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