JPH04103273A - Audio intermediate frequency changeover device - Google Patents
Audio intermediate frequency changeover deviceInfo
- Publication number
- JPH04103273A JPH04103273A JP2221891A JP22189190A JPH04103273A JP H04103273 A JPH04103273 A JP H04103273A JP 2221891 A JP2221891 A JP 2221891A JP 22189190 A JP22189190 A JP 22189190A JP H04103273 A JPH04103273 A JP H04103273A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- audio intermediate
- ceramic filter
- intermediate frequency
- diode
- 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
- 101000772194 Homo sapiens Transthyretin Proteins 0.000 claims 1
- 102100029290 Transthyretin Human genes 0.000 claims 1
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 239000000919 ceramic Substances 0.000 abstract description 25
- 230000008030 elimination Effects 0.000 abstract 1
- 238000003379 elimination reaction Methods 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 1
- 230000005236 sound signal Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 101150072055 PAL1 gene Proteins 0.000 description 1
Landscapes
- Television Receiver Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、音声中間周波の周波数が異なる地域でも、音
声が異和感なく聞こえるようにした音声中間周波切換装
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 intermediate frequency switching device that allows audio to be heard without any discomfort even in areas where audio intermediate frequencies have different frequencies.
従来の技術
ＰＡＬ方式の音声信号の搬送波は、方式により映像搬送
周波数よりＰＡＬ Ｉでは６．０間Ｚ、ＰＡＬ Ｂ
−Ｇ−Ｈでは５．５８Ｈ２高い周波数となっている。た
とえば、ＰＡＬ １とＰＡＬ Ｂ−Ｇ−Ｈの従来の
音声中ｒ：ＦＩ信号の切換装置の要部の回路図は第２図
に示すように構成される。Conventional technology The carrier wave of the audio signal in the PAL system differs from the video carrier frequency by 6.0 Z for PAL I and Z for PAL B, depending on the system.
-GH has a higher frequency by 5.58H2. For example, a circuit diagram of a main part of a conventional audio r:FI signal switching device for PAL 1 and PAL B-G-H is configured as shown in FIG.
第２図において、ｌは５．５ＭＨｚのセラミックフィル
タは、２は６．０ＭＨｚのセラミックフィルタ、３は５
．５８Ｈ２と６．０ｔ４Ｈ２とを切換えるための切換回
路で、５．５ＭＨｚのセラミックフィルタ１の出力側に
アノードが接続されたダイオードＤ１ と６．０ＭＨｚ
のセラミックフィルタ２の出力側にアノードが！ｌ続さ
れたダイオードＤ２と、これらダイオードＤ１ 、 Ｄ
２のアノードと切換スイッチＳＷの間に設けられた抵抗
Ｒ１、Ｒ２と、ダイオードＤＩ 、Ｄ２のカソードの接
続点とアースの間に設けられた抵抗Ｒ４と、ダイオード
Ｄ２のアノードとアースの間に設けられた抵抗Ｒ３とで
構成されている。４はセラミックフィルタ１．２に入力
される検波出力、５はダイオードＤ２のカソードから出
力される音声中間周波出力である。In Figure 2, l is a 5.5MHz ceramic filter, 2 is a 6.0MHz ceramic filter, and 3 is a 5.5MHz ceramic filter.
．． This is a switching circuit for switching between 58H2 and 6.0t4H2, which uses a diode D1 whose anode is connected to the output side of a 5.5MHz ceramic filter 1 and a 6.0MHz
There is an anode on the output side of ceramic filter 2! 1 connected diode D2 and these diodes D1, D
Resistors R1 and R2 are provided between the anodes of 2 and changeover switch SW, resistors R4 are provided between the connection point of the cathodes of diodes DI and D2, and ground, and resistors R4 are provided between the anode of diode D2 and ground. It consists of a resistor R3. 4 is the detection output input to the ceramic filter 1.2, and 5 is the audio intermediate frequency output output from the cathode of the diode D2.
このように構成された音声中間周波切換回路について、
以下その動作について説明する。Regarding the audio intermediate frequency switching circuit configured in this way,
The operation will be explained below.
ＰＡＬ Ｂ−Ｇ−Ｈ受信時において、スイッチＳＷが
５．５８８２のセラミックフィルタ１を選択する側（第
２図に示す位置）に切り換えられたとすると、ダイオー
ドＤ１のアノード側の電位がカソード側の電位よりも高
くなり、かつダイオードＤ２のアノード側の電位がカソ
ード側の電位より低くなるように抵抗Ｒ１〜Ｒ４を設定
しておけば、ダイオードＤ１がオン、ダイオードＤ２が
カットオフ状態となり、音声中間゛周波信号５は、５．
５ＮｔｌＺの成分だけとなる。また、ＰＡＬ Ｉ受信
時には、スイッチＳＷが６．０ＭＨｚのセラミックフィ
ルタ２を選択する側に切り換えられると、ダイオードＤ
１がカットオフ、ダイオードＤ２がオン状態となり、音
声中間周波信号５は６．０ＭＨｚ成分だけとなる。When receiving PAL B-G-H, if the switch SW is switched to the side that selects the 5.5882 ceramic filter 1 (the position shown in Figure 2), the potential on the anode side of the diode D1 becomes the potential on the cathode side. If the resistors R1 to R4 are set so that the potential on the anode side of the diode D2 is higher than the potential on the cathode side, the diode D1 is turned on and the diode D2 is cut off, and the audio intermediate The frequency signal 5 is 5.
Only the 5NtlZ component is present. In addition, when receiving PAL I, when the switch SW is switched to the side that selects the 6.0MHz ceramic filter 2, the diode D
1 is cut off, the diode D2 is turned on, and the audio intermediate frequency signal 5 has only a 6.0 MHz component.
発明が解決しようとする課題
しかし、ＰＡＬ Ｂ−Ｇ−Ｈ受信時、５．５ＭＨｚの
ＦＭ音声信号とは別に、５．８５）４Ｈｚの副搬送波で
ディジタル音声信号がＱＰＳＫ変調されて伝送されてい
る場合があり、従来例の場合では、ダイオードＤ２がオ
フ状態であっても、ダイオードＤ２のアノード、カソー
ド間の静電容量が無視できなくなり、６．０ＭＨｚのセ
ラミックフィルタ２のラインから５．８５ＭＨｚのＱＰ
ＳＫ信号がもれ込んできてしまい、５．８５）４）１ｚ
のＱ Ｐ Ｓ Ｋ ｍ号がセラミックフィルタ１のライ
ンの５．５ＭＨｚのＦＭ信号に与える妨害が無視できな
くなるという問題を有していた。Problems to be Solved by the Invention However, when receiving PAL B-G-H, a digital audio signal is QPSK modulated and transmitted using a 5.85) 4Hz subcarrier in addition to the 5.5MHz FM audio signal. In the case of the conventional example, even if the diode D2 is off, the capacitance between the anode and cathode of the diode D2 cannot be ignored, and the 5.85MHz line from the 6.0MHz ceramic filter 2 line cannot be ignored. QP
SK signal leaked in, 5.85)4)1z
There was a problem in that the interference caused by the Q P S K m number to the 5.5 MHz FM signal on the line of the ceramic filter 1 could no longer be ignored.
本発明は、上記問題に鑑み、ＰＡＬＢ−Ｇ・Ｈ受信時の
５．８５ＮＨ２Ｑ Ｐ Ｓ Ｋ信号が５．５ＭＨｚのＦ
Ｍ信号に与える妨害を少なくすることのできる音声中間
周波の切換装置を提供することを目的とするものである
。In view of the above problems, the present invention provides that the 5.85NH2Q PSK signal at the time of PALB-G/H reception is 5.5MHz F
It is an object of the present invention to provide an audio intermediate frequency switching device that can reduce interference to M signals.
課題を解決するための手段
上記課題を解決するために、本発明の音声中間周波切換
装置は、ＰＡＬ Ｂ−Ｇ−Ｈ受信時に６．０ＭＨｚの
フィルタラインからもれ込んでくる５、８５ＮＨ２のＱ
ＰＳＫ信号を５．５）４）１ｚのＦＭ信号へもれ込んで
こないように構成したものである。Means for Solving the Problems In order to solve the above problems, the audio intermediate frequency switching device of the present invention has a Q of 5,85NH2 that leaks from the 6.0MHz filter line during PAL B-G-H reception.
The configuration is such that the PSK signal does not leak into the 5.5)4)1z FM signal.
作用
この構成によって、ＰＡＬ Ｂ−Ｇ−Ｈ信号受信時に
、５．５ＭＨｚのＦＭ音声信号に５．８５Ｈｆｌｚのデ
ィジタル音声信号がもれ込んでこないことになり、ＱＰ
ＳＫ信号がＦＭ信号に与える妨害が改善されることにな
る。Effect This configuration prevents the 5.85Hflz digital audio signal from leaking into the 5.5MHz FM audio signal when receiving the PAL B-G-H signal, and the QP
The interference caused by the SK signal to the FM signal will be improved.
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 Hereinafter, an example of the present invention will be described with reference to the drawings.
第１図は本発明の一実施例の音声中間周波切換装置を示
す回路図である。第１図において、１は５．５ＨＨ２の
セラミックフィルタ、２は６．０ＭＨｚのセラミックフ
ィルタ、３は５．５ＭＨｚと６．０ＭＨｚとを切換える
ための切換回路、４は検波出力、５は音声中間周波出力
で、従来のものと同じである。６は６．０ＭＨｚのセラ
ミックフィルタ２のラインからもれこんでくる信号を除
去する回路で、セラミックフィルタ２に接続されたトラ
ンジスタＴｒとこのトランジスタＴ１にバイアス電圧を
与える抵抗Ｒ５。FIG. 1 is a circuit diagram showing an audio intermediate frequency switching device according to an embodiment of the present invention. In Figure 1, 1 is a 5.5HH2 ceramic filter, 2 is a 6.0MHz ceramic filter, 3 is a switching circuit for switching between 5.5MHz and 6.0MHz, 4 is a detection output, and 5 is an audio intermediate frequency. The output is the same as the conventional one. 6 is a circuit for removing a signal leaking from the line of the 6.0 MHz ceramic filter 2, which includes a transistor Tr connected to the ceramic filter 2 and a resistor R5 that applies a bias voltage to the transistor T1.
Ｒ６とで構成されている。この場合、バイアス電圧は切
換回路３が５．５ｔ４Ｈｚ側に切り換えられているとき
に、（第１図に示す位置）トランジスタＴ１に印加され
るものとする。It is composed of R6. In this case, it is assumed that the bias voltage is applied to the transistor T1 (at the position shown in FIG. 1) when the switching circuit 3 is switched to the 5.5t4Hz side.
このように構成された音声中間周波の切換装置について
、以下その動作について説明する。The operation of the audio intermediate frequency switching device configured as described above will be described below.
ＰＡＬ Ｉ受信時に、スイッチＳＷは６０）４１１ｚ
のセラミックフィルタ２を選択する側に切り換えられて
いる場合、ダイオードＤ、、Ｄ２のオン／オフの状態は
従来例と同じであり、ダイオードＤ２がオンするものと
する。このとき、バイアス電圧は印加されないので、ト
ランジスタＴｒはオフ状態であり、動作は従来例と同じ
である。When receiving PAL I, switch SW is 60)411z
When the ceramic filter 2 is switched to the side that selects the ceramic filter 2, the on/off states of the diodes D, , D2 are the same as in the conventional example, and the diode D2 is turned on. At this time, since no bias voltage is applied, the transistor Tr is in an off state, and the operation is the same as in the conventional example.
次にＰＡＬ Ｂ−Ｇ−Ｈ受信時、スイッチＳＷが５．
５８Ｈ２のセラミックフィルタ１を選択する側に切り換
えられると、ダイオードＤ１がオン、ダイオードＤ２が
オフの状態となるのは従来例と同様であるが、トランジ
スタＴｒがバイアス電圧によりオンとなるため、従来例
のように、ダイオードＤ２の静電容量のためにもれこん
できた５、８５ＭＨｚのＱＰＳＫ信号がグランドにおち
ることになり、このため、６．０Ｈｆｌｚのセラミック
フィルタ２のラインから５．８５ＭＨｚのＱＰＳＫ信号
が５．５ＭＨｚのセラミックフィルタ１のラインにもれ
込んでいくことはなくなり、５．８５ＭＨｚのＱＰＳＫ
信号が５．５ＭＨｚのＦＭ信号に妨害を与えることは改
善される。Next, when receiving PAL B-G-H, switch SW is set to 5.
When the 58H2 ceramic filter 1 is switched to the side where it is selected, the diode D1 is turned on and the diode D2 is turned off, which is the same as in the conventional example, but since the transistor Tr is turned on by the bias voltage, it is different from the conventional example. As shown in the figure, the 5.85 MHz QPSK signal that has leaked due to the capacitance of the diode D2 falls to the ground, and therefore the 5.85 MHz QPSK signal is transmitted from the 6.0 Hflz ceramic filter 2 line. The signal no longer leaks into the 5.5MHz ceramic filter 1 line, and the 5.85MHz QPSK
The interference of the signal with the 5.5 MHz FM signal is improved.
以上のように、本実施例によれば、ＰＡＬ、 Ｂ・Ｇ
−Ｈ受信時に６．０ＨＨ２のセラミックフィルタ２のラ
インをグランドにおとすことによってＱＰＳＫ信号のＦ
Ｍｉ号への妨害を少なくすることができる。As described above, according to this embodiment, PAL, B/G
-F of the QPSK signal by grounding the line of the 6.0HH2 ceramic filter 2 when receiving H.
Interference to Mi can be reduced.
発明の効果
以上のように本発明によれば、簡単な回路を付加するだ
けで、５．８５ＭＨｚのＱＰＳＫ信号が５．５）４Ｈｚ
のＦＭ信号に与える妨害を少なくすることができ、その
実用的効果は大なるものである。Effects of the Invention As described above, according to the present invention, a 5.85MHz QPSK signal can be converted to a 5.5)4Hz signal by simply adding a simple circuit.
It is possible to reduce the interference given to the FM signal, which has a great practical effect.
第１図は本発明の一実施例における音声中間周波切換装
置の回路図、第２図は従来例の音声中間周波切換装置の
回路図である。
１・・・５．５ＭＨｚのセラミックフィルタ、２・・・
６．０ＭＨｚのセラミックフィルタ、３・・・切換回路
、４・・・検波出力、５・・・音声中間周波出力、６・
・・５．８５）４Ｈｚの除去回路。
代理人 森 本 義 弘FIG. 1 is a circuit diagram of an audio intermediate frequency switching device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional audio intermediate frequency switching device. 1...5.5MHz ceramic filter, 2...
6.0MHz ceramic filter, 3... switching circuit, 4... detection output, 5... audio intermediate frequency output, 6...
...5.85) 4Hz removal circuit. Agent Yoshihiro Morimoto
Claims (1)
複数の検波器と、検波された音声中間周波を増幅する音
声中間周波増幅回路との間に介装される音声中間周波切
換回路であって、ＰＡＬＢ・Ｇ・Ｈ受信時に選択される
５．５ＭＨｚの第１のフィルタと、ＰＡＬＩ受信時に選
択される６．０ＭＨｚの第２のフィルタと、ＰＡＬＢ・
Ｇ・Ｈ受信時に前記第２のフィルタからもれ込んでくる
５．８５ＭＨｚのＱＰＳＫ信号を除去するように前記第
２のフィルタに付設された除去回路とを備えた音声中間
周波切換装置。1. An audio intermediate frequency switching circuit interposed between a plurality of detectors for detecting audio intermediate frequencies of television signals and an audio intermediate frequency amplification circuit for amplifying the detected audio intermediate frequencies, , a first filter of 5.5 MHz selected when receiving PALB・G・H, a second filter of 6.0 MHz selected when receiving PALI,
An audio intermediate frequency switching device comprising: a removal circuit attached to the second filter so as to remove a 5.85 MHz QPSK signal leaking from the second filter during G/H reception.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2221891A JPH04103273A (en) | 1990-08-22 | 1990-08-22 | Audio intermediate frequency changeover device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2221891A JPH04103273A (en) | 1990-08-22 | 1990-08-22 | Audio intermediate frequency changeover device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04103273A true JPH04103273A (en) | 1992-04-06 |
Family
ID=16773796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2221891A Pending JPH04103273A (en) | 1990-08-22 | 1990-08-22 | Audio intermediate frequency changeover device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04103273A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012215193A1 (en) | 2011-08-29 | 2013-02-28 | Denso Corporation | Raindrop sensor attached to e.g. windshield of vehicle, has a projection extending from base in direction away from windshield and having a receiving portion engaged with engaging portion of outer housing attached to attachment element |
-
1990
- 1990-08-22 JP JP2221891A patent/JPH04103273A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012215193A1 (en) | 2011-08-29 | 2013-02-28 | Denso Corporation | Raindrop sensor attached to e.g. windshield of vehicle, has a projection extending from base in direction away from windshield and having a receiving portion engaged with engaging portion of outer housing attached to attachment element |
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