JPS6359311B2 - - Google Patents
Info
- Publication number
- JPS6359311B2 JPS6359311B2 JP58143236A JP14323683A JPS6359311B2 JP S6359311 B2 JPS6359311 B2 JP S6359311B2 JP 58143236 A JP58143236 A JP 58143236A JP 14323683 A JP14323683 A JP 14323683A JP S6359311 B2 JPS6359311 B2 JP S6359311B2
- Authority
- JP
- Japan
- Prior art keywords
- carrier wave
- audio
- amplifier
- video
- video carrier
- 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
- 238000001514 detection method Methods 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 5
- 230000005236 sound signal Effects 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
- H04N5/62—Intercarrier circuits, i.e. heterodyning sound and vision carriers
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、インターキヤリア方式のテレビジヨ
ン信号の音声検波装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an audio detection device for intercarrier television signals.
従来例の構成とその問題点
一般に、インターキヤリア方式におけるテレビ
ジヨン信号は映像信号が映像搬送波fvでAM変調
された映像搬送波信号と、音声信号が音声搬送波
fsでFM変調された音声搬送波信号が混合された
ものであり、映像搬送波信号がAM変調されてい
る関係で、そのAM変調成分によつて音声搬送波
信号がベクトル変調つまり位相変調を受けてい
る。しかしながら、上述したインターキヤリア方
式におけるテレビジヨン信号から音声信号を復調
する場合には、映像搬送波信号のAM変調成分が
大きいほどバズの発生が顕著なものとなり、音質
が変化するという欠点があつた。Conventional configuration and its problems In general, in intercarrier television signals, the video signal is a video carrier signal that is AM-modulated with a video carrier wave fv, and the audio signal is an audio carrier wave signal.
It is a mixture of an audio carrier signal that has been FM modulated with fs, and since the video carrier signal is AM modulated, the audio carrier signal is subjected to vector modulation, that is, phase modulation, by the AM modulation component. However, when demodulating an audio signal from a television signal using the above-mentioned intercarrier system, there is a drawback that the larger the AM modulation component of the video carrier signal, the more pronounced the buzz, which changes the sound quality.
発明の目的
本発明はこのような従来の欠点を解消するもの
であり、バズの発生を少なくして音質の劣化を防
止することができる音声検波装置を提供すること
を目的とする。OBJECTS OF THE INVENTION The present invention solves these conventional drawbacks, and aims to provide a voice detection device that can reduce the occurrence of buzz and prevent deterioration of sound quality.
発明の構成
この目的を達成するため、本発明の音声検波装
置は、映像搬送波の周波数附近に中心周波数を有
し、音声搬送波および映像搬送波を増幅する帯域
アンプと、増幅された映像搬送波のみをリミツテ
イングするリミツター回路と、同調アンプと、こ
の同調アンプを介した映像搬送波と音声搬送波と
を混合する混合器と、この混合器の出力をFM検
波するFM検波器とを具備してなることを特長と
するものである。Structure of the Invention In order to achieve this object, the audio detection device of the present invention includes a band amplifier that has a center frequency near the frequency of the video carrier wave and that amplifies the audio carrier wave and the video carrier wave, and a band amplifier that limits only the amplified video carrier wave. The device is characterized by being equipped with a limiter circuit that performs FM detection, a tuned amplifier, a mixer that mixes a video carrier wave and an audio carrier wave via this tuned amplifier, and an FM detector that performs FM detection on the output of this mixer. It is something to do.
実施例の説明
第１図は本発明の一実施例を示しており、第１
図において、チユーナ１を通して同調された音声
及び映像搬送波はVIFアンプ２を通つて増幅さ
れ、一方は映像復調回路３により映像信号とな
る。上記VIFアンプ２は第２図に示すごとく音声
信号による映像信号への影響を除くために音声信
号トラツプ回路が挿入されている。このVIFアン
プ２の利得−周波数特性を利用して映像搬送波の
AM分を除去する為、映像搬送波の周波数附近に
中心周波数をもつ帯域アンプ４を設けている。こ
の帯域アンプ４の周波数特性は第３図に示すごと
くである。この帯域アンプ４により上記両搬送波
は増幅され、リミツター回路５により両搬送波の
うち映像搬送波だけリミツテイング動作をうけ、
映像搬送波は第４図Ａ，Ｂに示すごとくAM分が
なくなり、同調アンプ６に加えられる。この同調
アンプ６では上下にクリツプした映像搬送波は第
５図に示すように正弦波となる。この第５図に示
す映像搬送波と、音声搬送波とが混合器７に入
り、ミツクスダウンされた音声搬送波が得られ
る。そして、この音声搬送波はFM検波器８で
FM検波される。DESCRIPTION OF EMBODIMENTS FIG. 1 shows an embodiment of the present invention.
In the figure, audio and video carrier waves tuned through a tuner 1 are amplified through a VIF amplifier 2, and one is converted into a video signal by a video demodulation circuit 3. As shown in FIG. 2, the VIF amplifier 2 has an audio signal trap circuit inserted therein to eliminate the influence of the audio signal on the video signal. Using the gain-frequency characteristics of VIF amplifier 2, the video carrier wave is
In order to remove the AM component, a band amplifier 4 having a center frequency near the frequency of the video carrier wave is provided. The frequency characteristics of this band amplifier 4 are as shown in FIG. Both carrier waves are amplified by the band amplifier 4, and only the video carrier wave is subjected to a limiting operation by the limiter circuit 5.
As shown in FIG. 4A and B, the video carrier wave loses its AM component and is added to the tuned amplifier 6. In this tuning amplifier 6, the vertically clipped video carrier wave becomes a sine wave as shown in FIG. The video carrier wave shown in FIG. 5 and the audio carrier wave enter a mixer 7, and a mixed down audio carrier wave is obtained. This audio carrier wave is then detected by the FM detector 8.
FM detected.
発明の効果
以上のように本発明によれば、映像搬送波の周
波数附近に中心周波数を有する帯域アンプによつ
て音声搬送波および映像搬送波を増幅し、その増
幅された映像搬送波のみをリミツター回路にてリ
ミツテイングし、そのリミツター回路の出力を同
調アンプを介して音声搬送波が加えられる混合器
に入力し、その混合器の出力をFM検波するよう
に構成したので、映像搬送波のAM変調分を除去
することができ、そのため映像信号による音声信
号への影響がなくなり、バズの発生が起こりにく
くなり、音質が劣化することが少なくなる利点を
有するものである。また本発明によれば帯域アン
プとリミツター回路を付加するだけであり、簡単
な回路で実現できる利点を有するものである。Effects of the Invention As described above, according to the present invention, an audio carrier wave and a video carrier wave are amplified by a band amplifier having a center frequency near the frequency of a video carrier wave, and only the amplified video carrier wave is limited by a limiter circuit. The output of the limiter circuit is then input through a tuned amplifier to a mixer to which an audio carrier wave is added, and the output of the mixer is configured to undergo FM detection, making it possible to remove the AM modulation component of the video carrier wave. This has the advantage that the influence of the video signal on the audio signal is eliminated, the generation of buzz is less likely to occur, and the deterioration of sound quality is less likely. Further, according to the present invention, only a band amplifier and a limiter circuit are added, and the present invention has the advantage that it can be realized with a simple circuit.
第１図は本発明の一実施例におけるテレビ音声
検波装置のブロツク図、第２図は同装置のVIFア
ンプの特性図、第３図は同装置の帯域アンプの特
性図、第４図ａ，ｂは同装置のリミツター回路の
動作説明図、第５図は同期アンプの出力後の映像
搬送波の波形図である。
１……チユーナ、２……VIFアンプ、３……映
像復調回路、４……帯域アンプ、５……リミツタ
ー回路、６……同調アンプ、７……混合器、８…
…FM検波器。
FIG. 1 is a block diagram of a television audio detection device according to an embodiment of the present invention, FIG. 2 is a characteristic diagram of the VIF amplifier of the same device, FIG. 3 is a characteristic diagram of the band amplifier of the same device, and FIG. b is an explanatory diagram of the operation of the limiter circuit of the same device, and FIG. 5 is a waveform diagram of the video carrier wave after output from the synchronous amplifier. 1... Tuner, 2... VIF amplifier, 3... Video demodulation circuit, 4... Bandwidth amplifier, 5... Limiter circuit, 6... Tuning amplifier, 7... Mixer, 8...
...FM detector.
Claims (1)
音声検波装置であつて、映像搬送波の周波数附近
に中心周波数を有し、音声搬送波および映像搬送
波を増幅する帯域アンプと、増幅された映像搬送
波のみをリミツテイングするリミツター回路と、
同調アンプと、この同調アンプを介した映像搬送
波と音声搬送波とを混合する混合器と、この混合
器の出力をFM検波するFM検波器とを具備して
なる音声検波装置。1. An audio detection device for intercarrier television signals, which has a center frequency near the frequency of the video carrier wave, and includes a band amplifier that amplifies the audio carrier wave and the video carrier wave, and a limiter that limits only the amplified video carrier wave. circuit and
An audio detection device comprising a tuned amplifier, a mixer that mixes a video carrier wave and an audio carrier wave via the tuned amplifier, and an FM detector that performs FM detection on the output of the mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58143236A JPS5951677A (en) | 1983-08-04 | 1983-08-04 | Sound detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58143236A JPS5951677A (en) | 1983-08-04 | 1983-08-04 | Sound detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5951677A JPS5951677A (en) | 1984-03-26 |
| JPS6359311B2 true JPS6359311B2 (en) | 1988-11-18 |
Family
ID=15334061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58143236A Granted JPS5951677A (en) | 1983-08-04 | 1983-08-04 | Sound detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5951677A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5198904A (en) * | 1991-02-25 | 1993-03-30 | Comark Communications, Inc. | Aural carrier correction system and method |
| US5430498A (en) * | 1994-03-01 | 1995-07-04 | Comark Communications, Inc. | Selective intermodulation correction system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4911015A (en) * | 1972-05-26 | 1974-01-31 |
-
1983
- 1983-08-04 JP JP58143236A patent/JPS5951677A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4911015A (en) * | 1972-05-26 | 1974-01-31 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5951677A (en) | 1984-03-26 |
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