JP2552306Y2 - PAL / SECAM switching modulator IC - Google Patents

PAL / SECAM switching modulator IC

Info

Publication number
JP2552306Y2
JP2552306Y2 JP1990061610U JP6161090U JP2552306Y2 JP 2552306 Y2 JP2552306 Y2 JP 2552306Y2 JP 1990061610 U JP1990061610 U JP 1990061610U JP 6161090 U JP6161090 U JP 6161090U JP 2552306 Y2 JP2552306 Y2 JP 2552306Y2
Authority
JP
Japan
Prior art keywords
secam
pal
modulator
circuit
audio signal
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
Application number
JP1990061610U
Other languages
Japanese (ja)
Other versions
JPH0420776U (en
Inventor
悟 沢田
篤 山田
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.)
Mitsumi Electric Co Ltd
Original Assignee
Mitsumi Electric Co 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 Mitsumi Electric Co Ltd filed Critical Mitsumi Electric Co Ltd
Priority to JP1990061610U priority Critical patent/JP2552306Y2/en
Publication of JPH0420776U publication Critical patent/JPH0420776U/ja
Application granted granted Critical
Publication of JP2552306Y2 publication Critical patent/JP2552306Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【考案の詳細な説明】 〔産業上の利用分野〕 本考案はPAL/SECAM切換えモジュレータ用ICに係り、P
AL方式及びSECAM方式の各テレビジョン方式に切換え適
用されるVTR(ビデオデッキ)のモジュレータに関す
る。
[Detailed description of the invention] [Industrial application field] The present invention relates to an IC for a PAL / SECAM switching modulator.
The present invention relates to a VTR (video deck) modulator that is applied to a television system of an AL system or a SECAM system.

〔従来の技術〕[Conventional technology]

第2図は従来の一例のブロック図を示す。同図中、1
はPAL専用ICで、クランプ回路2,クリップ回路3,アンプ
4(以上、映像信号系),アンプ5,FM変調発振回路6
(以上、音声信号系)にて構成されている。端子8に入
来した映像信号はクランプ回路2,クリップ回路3,アンプ
4を介して次に示す音声信号と混合される。PAL方式に
適用する場合、スイッチSW1〜SW4を夫々端子P側に接続
する。端子10に入来した音声信号はエンファシス回路11
を経てFM変調発振回路6にてFM変調をかけられ、アンプ
5,スイッチSW3,SW4を経て映像信号と混合され、発振器
14の出力を搬送波とする平衡変調器9にて負の平衡変調
をかけられ、出力端子12より取出されてテレビジョン受
信機に供給される。FM変調に際し、FM変調発振回路6は
同調回路13の出力にて同調をとられて発振し、この発振
周波数信号を搬送波として音声信号でFM変調する。
FIG. 2 shows a block diagram of an example of the conventional art. In the figure, 1
Is a PAL-dedicated IC, which includes a clamp circuit 2, a clip circuit 3, an amplifier 4 (above, a video signal system), an amplifier 5, and an FM modulation oscillation circuit 6.
(Above, an audio signal system). The video signal input to the terminal 8 is mixed with the following audio signal via the clamp circuit 2, the clip circuit 3, and the amplifier 4. When applied to the PAL system, connects the switch SW 1 to SW 4 to each terminal P side. The audio signal coming into terminal 10 is sent to emphasis circuit 11
Through the FM modulation oscillation circuit 6
5, is mixed with the video signal via the switch SW 3, SW 4, oscillator
Negative balanced modulation is applied by a balanced modulator 9 using the output of 14 as a carrier wave, taken out from an output terminal 12 and supplied to a television receiver. At the time of FM modulation, the FM modulation oscillating circuit 6 tunes and oscillates at the output of the tuning circuit 13, and uses this oscillation frequency signal as a carrier wave to perform FM modulation with an audio signal.

一方、SECAM方式に適用する場合、スイッチSW1〜SW4
を夫々端子S側に接続する。端子10に入来した音声信号
はAM変調器15,セラミックフィルタ16,スイッチSW4を経
て映像信号と混合され、平衡変調器9にて正の平衡変調
をかけられ、出力端子12より取出される。AM変調に際
し、FM変調発振回路6は同調回路18の出力にて同調をと
られて発振し、この発振周波数信号は、アンプ5,スイッ
チSW3を介して搬送波としてAM変調器15に供給される。
On the other hand, when applied to the SECAM system, the switch SW 1 to SW 4
Are connected to the terminal S side. Audio signal AM modulator 15 which is incoming to the terminal 10, the ceramic filter 16, is mixed with the video signal via the switch SW 4, multiplied by the positive balanced modulation by balanced modulator 9, it is discharged from the output terminal 12 . Upon AM modulation, FM modulation oscillator 6 oscillates taken tuning at the output of the tuning circuit 18, the oscillation frequency signal, the amplifier 5, is supplied to the AM modulator 15 as a carrier wave through a switch SW 3 .

〔考案が解決しようとする課題〕[Problems to be solved by the invention]

従来のモジュレータは、IC1はPAL専用のものであり、
SECAM方式のAM変調器15はIC1の外部に設けられており、
又、IC1の外部にはこの他にもスイッチSW1〜SW4同調回
路13,18等が設けられている。更にIC1外部にAM変調器15
を設けたことによってパターン長が長くなり、ノイズが
混入し易くなるので、これを防止するために音声高周波
抑制用のセラミックフィルタ16を必要とする。このよう
に、従来のモジュレータはICの外部に設ける外付部品点
数が多くなり、装置を小型化しにくく、コスト高になる
問題点があった。
In the conventional modulator, IC1 is dedicated to PAL,
The SECAM type AM modulator 15 is provided outside the IC 1,
The switch SW 1 to SW 4 tuned circuits 13 and 18 and the like in addition to this is provided on the outside of the IC1. AM modulator 15 outside IC1
The length of the pattern becomes longer due to the provision of the filter, and the noise is easily mixed. Therefore, a ceramic filter 16 for suppressing the high frequency of the sound is required to prevent this. As described above, the conventional modulator has a problem that the number of external parts provided outside the IC is increased, and it is difficult to reduce the size of the device and the cost is increased.

本考案はIC外付部品点数を少なくし、モジュレータを
小型化及び低コストに構成できるPAL/SECAM切換えモジ
ュレータ用ICを提供することを目的とする。
SUMMARY OF THE INVENTION It is an object of the present invention to provide a PAL / SECAM switching modulator IC that can reduce the number of external components of the IC and reduce the size and cost of the modulator.

〔課題を解決するための手段〕[Means for solving the problem]

本発明は、PAL用又はSECAM用入力音声信号により切り
換え信号に応じてPAL用又はSECAM用変調方式で選択的に
変調を行うPAL/SECAM切換モジュレータ用ICであって、 前記PAL用入力音声信号を変調するためのPAL用同調回
路が外づけで接続され、前記PAL用入力音声信号により
該PAL用同調回路により設定された周波数の発振信号をF
M変調するPAL用入力音声信号FM変調発振回路と、 前記SECAM用入力音声信号を変調するためのSECAM用同
調回路が外づけで接続され、前記SECAM用入力音声信号
を変調するための周波数の発振信号を出力するSECAM用
発振回路と、 前記SECAM用発振回路から発振された発振信号を前記S
ECAM用入力音声信号でAM変調するAM変調器とを内蔵した
構成としてなる。
The present invention is an IC for a PAL / SECAM switching modulator that selectively modulates with a PAL or SECAM modulation method according to a switching signal by a PAL or SECAM input audio signal, wherein the PAL input audio signal is A PAL tuning circuit for modulating is externally connected, and an oscillation signal of a frequency set by the PAL tuning circuit is input to the FAL by the PAL input audio signal.
A PAL input audio signal FM modulation oscillation circuit for M-modulation, and a SECAM tuning circuit for modulating the SECAM input audio signal are externally connected to oscillate a frequency for modulating the SECAM input audio signal. A SECAM oscillation circuit for outputting a signal, and an oscillation signal oscillated from the SECAM oscillation circuit to the SCAM.
An AM modulator for performing AM modulation with an input audio signal for ECAM is built in.

〔作用〕[Action]

本考案では、特にAM変調器をIC内に設けたため、AM変
調器をIC外付部品とした従来例に比してパターン長を短
くでき、これにより、ノイズの混入が少なくなるので従
来例のようなセラミックフィルタをIC外付部品として設
ける必要なく構成できる。また、同調回路をそれぞれ別
々にICに接続できるため、同調回路を切換えるスイッチ
が不要となり、外付け部品を低減できる。従って全体と
してIC外付部品点数を少なく構成でき、モジュレータを
小形化できる。
In the present invention, in particular, since the AM modulator is provided in the IC, the pattern length can be shortened as compared with the conventional example in which the AM modulator is an external component of the IC. Such a ceramic filter can be configured without having to be provided as an external component of the IC. In addition, since the tuning circuits can be separately connected to the IC, a switch for switching the tuning circuits is not required, and external components can be reduced. Therefore, the number of IC external parts can be reduced as a whole, and the modulator can be downsized.

〔実施例〕〔Example〕

第1図は本考案の一実施例のブロック図を示し、同図
中、第2図と同一構成部分には同一番号を付してその説
明を省略する。第1図中、20はPAL/SECAM両用ICで、ク
ランプ回路2,クップ回路3,アンプ4(以上、映像信号
系)、AM変調器21,FM変調発振回路6、発振回路22,アン
プ24,スイッチ回路25(以上、音声信号系)にて構成さ
れており、本考案の要部をなす。IC20の外部にはスイッ
チSW1エンファシス回路11,同調回路13,18等が設けられ
ている。
FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, the same components as those in FIG. In FIG. 1, reference numeral 20 denotes a PAL / SECAM IC, which includes a clamp circuit 2, a cup circuit 3, an amplifier 4 (above, a video signal system), an AM modulator 21, an FM modulation oscillation circuit 6, an oscillation circuit 22, an amplifier 24, It is composed of a switch circuit 25 (above, an audio signal system) and forms a main part of the present invention. Switch SW 1-emphasis circuit 11 to the outside of the IC 20, such as a tuning circuit 13 and 18 are provided.

PAL方式に適用する場合、スイッチSW1を端子P側に接
続すると共に、端子26にFM変調用発振動作切換制御信号
を供給する。端子10に入来した音声信号はエンファシス
回路11を経てFM変調発振回路6にてFM変調をかけられ、
アンプ24を介して平衡変調器9に供給される。FM変調に
際し、FM変調発振回路6はスイッチ回路25から切換出力
されたFM変調用発振動作切換制御信号にて動作状態とさ
れ、同調回路13の出力にて同調をとられて発振する。
When applied to the PAL system, the connecting switches SW 1 to the terminal P side, and supplies the oscillation operation switching control signal for FM modulation terminal 26. The audio signal input to the terminal 10 is subjected to FM modulation by the FM modulation oscillation circuit 6 through the emphasis circuit 11,
The signal is supplied to the balanced modulator 9 via the amplifier 24. At the time of FM modulation, the FM modulation oscillation circuit 6 is activated by the FM modulation oscillation operation switching control signal switched and output from the switch circuit 25, and is tuned by the output of the tuning circuit 13 to oscillate.

一方、SECAM方式に適用する場合、スイッチSW1を端子
S側に接続すると共に、端子26にAM変調用発振動作切換
切換制御信号を供給する。端子10に入来した音声信号は
AM変調器21にてAM変調をかけられ、アンプ24を介して平
衡変調器9に供給される。AM変調に際し、発振回路22は
スイッチ回路25から切換出力されたAM変調用発振動作切
換制御信号にて動作状態とされ、同調回路18の出力にて
同調をとられて発振する。
On the other hand, when applied to the SECAM system, the connecting switches SW 1 to the terminal S side, it supplies the AM modulation oscillator operation switching換切switching control signal to the terminal 26. The audio signal coming into terminal 10
The signal is subjected to AM modulation by the AM modulator 21 and supplied to the balanced modulator 9 via the amplifier 24. At the time of AM modulation, the oscillation circuit 22 is activated by the AM modulation oscillation operation switching control signal switched and output from the switch circuit 25, and is tuned by the output of the tuning circuit 18 to oscillate.

本考案においては、SECAM方式のためのAM変調器21,PA
L方式のためのFM変調発振回路6,発振回路22,スイッチ回
路25等をIC20内に設けたため、IC外付部品点数を少なく
構成でき、モジュレータを小形化できる。この場合、特
にAM変調器21をIC20内に設けたため、AM変調器をIC外付
部品として構成した従来例に比してパターン長を短くで
き、これにより、ノイズの混入が少なくなり、従来例の
ような音声高周波抑圧用のセラミックフィルタ16をIC外
付部品として設ける必要がなく、又、従来例のようなス
イッチSW3,SW4を設ける必要もない。
In the present invention, the AM modulator 21 and the PA
Since the FM modulation oscillation circuit 6, oscillation circuit 22, switch circuit 25, and the like for the L system are provided in the IC 20, the number of IC external parts can be reduced and the modulator can be downsized. In this case, in particular, since the AM modulator 21 is provided in the IC 20, the pattern length can be shortened as compared with the conventional example in which the AM modulator is configured as an external component of the IC. There is no need to provide a ceramic filter 16 for suppressing high-frequency sound as an external component of the IC, and it is not necessary to provide switches SW 3 and SW 4 as in the conventional example.

〔考案の効果〕[Effect of the invention]

以上説明した如く、本考案によれば、特に、AM変調器
をIC内に設けたため、IC外付部品点数を少なく構成で
き、また、同調回路をそれぞれ別々にICに接続できるた
め、同調回路を切換えるスイッチが不要となり、外付け
部品を低減でき、従って、モジュレータを小形化でき、
安価に構成できる。
As described above, according to the present invention, in particular, since the AM modulator is provided in the IC, the number of external components of the IC can be reduced, and the tuning circuits can be separately connected to the IC. There is no need for a switch to change over, and external components can be reduced, so that the modulator can be downsized.
Inexpensive configuration.

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

第1図は本考案の一実施例のブロック図、 第2図は従来の一例のブロック図である。 6…FM変調発振回路、10…音声信号入力端子、11…エン
ファシス回路、12…出力端子、13,18…同調回路、20…P
AL/SECAM両用IC、21…AM変調器、22…発振回路、25…ス
イッチ回路、26…発振動作切換制御信号入力端子、SW1
…スイッチ。
FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an example of the related art. 6 FM modulation oscillator circuit, 10 audio signal input terminal, 11 emphasis circuit, 12 output terminal, 13, 18 tuning circuit, 20 P
AL / SECAM dual-purpose IC, 21: AM modulator, 22: oscillation circuit, 25: switch circuit, 26: oscillation operation switching control signal input terminal, SW 1
…switch.

Claims (1)

(57)【実用新案登録請求の範囲】(57) [Scope of request for utility model registration] 【請求項1】PAL用又はSECAM用入力音声信号により切り
換え信号に応じてPAL用又はSECAM用変調方式で選択的に
変調を行うPAL/SECAM切換モジュレータ用ICであって、 前記PAL用入力音声信号を変調するためのPAL用同調回路
が外づけで接続され、前記PAL用入力音声信号により該P
AL用同調回路により設定された周波数の発振信号をFM変
調するPAL用入力音声信号FM変調発振回路と、 前記SECAM用入力音声信号を変調するためのSECAM用同調
回路が外づけで接続され、前記SECAM用入力音声信号を
変調するための周波数の発振信号を出力するSECAM用発
振回路と、 前記SECAM用発振回路から発振された発振信号を前記SEC
AM用入力音声信号でAM変調するAM変調器とを内蔵した構
成としてなるPAL/SECAM切換えモジュレータ用IC。
1. A PAL / SECAM switching modulator IC for selectively modulating a PAL or SECAM modulation method according to a switching signal by a PAL or SECAM input audio signal, wherein the PAL input audio signal is A PAL tuning circuit for modulating the signal is externally connected, and the PAL input audio signal
A PAL input audio signal FM modulation oscillation circuit for FM-modulating an oscillation signal of a frequency set by the AL tuning circuit, and a SECAM tuning circuit for modulating the SECAM input audio signal are externally connected, and An SECAM oscillation circuit that outputs an oscillation signal having a frequency for modulating a SECAM input audio signal; and an SEC signal that oscillates from the SECAM oscillation circuit.
A PAL / SECAM switching modulator IC with a built-in configuration that incorporates an AM modulator that performs AM modulation with an AM input audio signal.
JP1990061610U 1990-06-11 1990-06-11 PAL / SECAM switching modulator IC Expired - Lifetime JP2552306Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1990061610U JP2552306Y2 (en) 1990-06-11 1990-06-11 PAL / SECAM switching modulator IC

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1990061610U JP2552306Y2 (en) 1990-06-11 1990-06-11 PAL / SECAM switching modulator IC

Publications (2)

Publication Number Publication Date
JPH0420776U JPH0420776U (en) 1992-02-21
JP2552306Y2 true JP2552306Y2 (en) 1997-10-29

Family

ID=31590011

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1990061610U Expired - Lifetime JP2552306Y2 (en) 1990-06-11 1990-06-11 PAL / SECAM switching modulator IC

Country Status (1)

Country Link
JP (1) JP2552306Y2 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5588474A (en) * 1978-12-26 1980-07-04 Hitachi Ltd Rf modulator for both pal and secam

Also Published As

Publication number Publication date
JPH0420776U (en) 1992-02-21

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