JPH04100307A - Twin tuner television receiver for mobile body - Google Patents

Twin tuner television receiver for mobile body

Info

Publication number
JPH04100307A
JPH04100307A JP21772290A JP21772290A JPH04100307A JP H04100307 A JPH04100307 A JP H04100307A JP 21772290 A JP21772290 A JP 21772290A JP 21772290 A JP21772290 A JP 21772290A JP H04100307 A JPH04100307 A JP H04100307A
Authority
JP
Japan
Prior art keywords
circuit
channel
output
channel selection
video 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.)
Pending
Application number
JP21772290A
Other languages
Japanese (ja)
Inventor
Masayuki Suzuki
正幸 鈴木
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.)
Seiko Epson Corp
Original Assignee
Seiko Epson Corp
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 Seiko Epson Corp filed Critical Seiko Epson Corp
Priority to JP21772290A priority Critical patent/JPH04100307A/en
Publication of JPH04100307A publication Critical patent/JPH04100307A/en
Pending legal-status Critical Current

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  • Superheterodyne Receivers (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To select a channel whose reception state is excellent by providing a controller controlling the channel selection of two sets of tuners and a changeover means of an output of an IF circuit to the television receiver so as to seek a channel of a same broadcast content automatically. CONSTITUTION:A controller 33 uses a system comprising a channel selection circuit 331a, a tuner 14a and an IF circuit 15a as a usual channel selection system when an output of the tuner 14a and the IF circuit 15a selected by the channel selection circuit 331a is sent to a post-stage circuit by an IF output switching circuit 16 and uses a system comprising a channel selection circuit 331b, a tuner 14b and an IF circuit 15b as a same broadcast content search channel selection to apply search channel selection at all times. In the case of a same broadcast content on a channel different from that for the usual channel selection based on an output of a video signal discrimination circuit 31, to which of IF circuits 15a, 15b a larger input level is given is discriminated based on the output of an input level discrimination circuit 32 and when the input level to the IF circuit 15b is discriminated to be larger, the changeover circuit 16 is selected. Thus, when a mobile body such as a vehicle moves in excess of the service area of a television broadcast wave, a channel of a same broadcast content is automatically sought and a channel whose reception state is excellent is selected.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は車両等移動体内で使用されるテレビジョン受信
機に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television receiver used in a moving body such as a vehicle.

〔従来の技術〕[Conventional technology]

従来の車両等移動体内で使用されるテレビジョン受信機
の関連技術としては、ダイパーツティ受信システムが良
く知られている。
2. Description of the Related Art As a conventional technology related to a television receiver used in a moving body such as a vehicle, a die part tea reception system is well known.

ダイパーシティ受信システムは複数のアンテナを設置し
、受信チャンネルに対して空間及び指向性で入力レベル
が最大となるアンテナを選択する7ステムである。
The diversity reception system is a 7-stem system in which multiple antennas are installed and the antenna with the highest spatial and directional input level is selected for the reception channel.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

テレビシコン放送波のサービスエリアは、最大の東京地
区でも半径70〜1100Kであり、−般的な地方キー
局の場合半径20〜4QKm程度である。
The service area of television broadcast waves is a radius of 70 to 1100 km even in the largest Tokyo area, and a radius of about 20 to 4 km for typical local key stations.

更に山間部のサテライト局では半径10Km以下のサー
ビスエリアとなっている。
Furthermore, satellite stations in mountainous areas have a service area with a radius of less than 10 km.

ダイパーシティ受信システムは受信チャンネルを特定し
て、最良の受信状態を得るシステムなので移動体がサー
ビスエリア外に出ると効果は発揮されない。
The diversity reception system is a system that identifies the reception channel and obtains the best reception conditions, so it is not effective if the mobile object moves out of the service area.

従って例えば高速道路上を移動する車両で、同一内容の
テレビジョン放送を連続して視聴する時には、15〜3
0分毎にサーチ選局を行なって同一内容のチャンネルに
再度選局する必要があった本発明は上記課題の改善をし
て、実用性の高い移動体用テレビジョン受信機を市場に
提供することを目的になされたものである。
Therefore, for example, when viewing television broadcasts of the same content continuously in a vehicle moving on a highway, the
The present invention solves the above problems and provides the market with a highly practical mobile television receiver that requires searching and selecting a channel every 0 minutes and re-selecting a channel with the same content. It was made for that purpose.

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

本発明の移動体用テレビジ3ン受信機は、(1)α) 
2組のチューナ、17回路と、b) 双方の工F回路出
力のいずれか一方を選択して後段回路へ伝送する切換手
段と、 C) 双方の工F回路入力レベルのいずれが大きいかを
判別する手段と、 d) 双方の工F回路出力の映像信号位相検出手段と、
映像信号比較手段により構成される、映像信号変調内容
が同一か否かを判別する手段と、C) 前記2判別手段
の出力を入力として、2組のチューナの選局と、工IF
回路出力の切換手段を制御するコントローラにより構成
されたことを特徴とする、移動体用ツインチューナテレ
ビジョン受信機。
The mobile television receiver of the present invention includes (1) α)
2 sets of tuners, 17 circuits; b) a switching means for selecting one of the outputs of both F circuits and transmitting it to the subsequent circuit; and C) determining which of the input levels of both F circuits is higher. d) means for detecting the phase of the video signal of the outputs of both F circuits;
C) A means for determining whether the video signal modulation contents are the same or not, which is constituted by a video signal comparison means;
1. A twin tuner television receiver for a mobile object, comprising a controller that controls circuit output switching means.

(2) 双方の工F回路入力レベルのいずれが大きいか
を判別する手段を、双方の工F回路出力の映像信号S 
/ N比のいずれが良いか判別する手段に置換したこと
を特徴とする(1)項記載の移動体用ツインチェーナテ
レビジョン受信機。
(2) The means for determining which of the input levels of both F circuits is higher is determined by using the video signal S of the output of both F circuits.
/N ratio is replaced with a means for determining which one is better.

〔作用〕[Effect]

本発明の移動体用テレビジョン受信機は、2組のチュー
ナ、17回路を設置して、1組を通常選局用、1組を同
一放送内容サーチ選局用として、通常選局用チューナ、
工F回路出力を切換手段により後段回路へ伝送する。
The mobile television receiver of the present invention is equipped with two sets of tuners and 17 circuits, one set for normal channel selection and one set for same broadcast content search channel selection.
The output of the engineering F circuit is transmitted to the subsequent circuit by the switching means.

司−放送内容サーチ選局用チューナ、17回路は常時サ
ーチ選局をして放送のあるチャンネルで一時停止し、双
方の工F回路出力の映像信号及び同期信号により、位相
を合わせて映像信号変調内容が同一であるか否かの判別
を行なう。
- Broadcast content search tuner, 17 circuits constantly search and select a channel, pause at a certain channel, and modulate the video signal by matching the phase with the video signal and synchronization signal output from both F circuits. It is determined whether the contents are the same or not.

映像信号変調内容が異なっていれば再度サーチ選局をし
て、次の放送のあるチャンネルで一時停止し、同様な動
作を繰返す。
If the video signal modulation content is different, the search is performed again, the channel is temporarily stopped at the next broadcast channel, and the same operation is repeated.

映像信号変調内容が同一のチャンネルが選局された場合
、選局動作を停止し、双方の工?回路入力レベルのいず
れが大きいかの判別を行ない、同一放送内容サーチ選局
用チューナ、17回路の出力の方が工F回路入力レベル
が小さいと判別した場合には、再度サーチ選局をして同
様な動作を繰返し、大きいと判別した場合は、工F回路
出力の切換手段を切換ると同時に、チャンネルが切換り
たことを選局表示する。
If a channel with the same video signal modulation content is selected, the channel selection operation is stopped and both channels are tuned. It is determined which of the circuit input levels is higher, and if it is determined that the output of the 17th circuit of the same broadcast content search tuner has a lower input level of the circuit F circuit, search and select again. The same operation is repeated, and if it is determined that the output is large, the switching means for the output of the F circuit is switched and, at the same time, a channel selection display is made to indicate that the channel has been switched.

切換前の通常選局用チューナ、17回路は、切換後は同
一放送内容サーチ選局用チューナ、17回路となり同様
な動作を繰返す。
The tuner circuit 17 for normal tuning before switching becomes the tuner circuit 17 for tuning the same broadcast content search after switching, and the same operation is repeated.

以上の様な動作により、車両等移動体でテレビジョン放
送波のサービスエリアを越えて移動した場合に、自動的
に同一放送内容のチャンネルを探し、受信状態の良好な
チャンネルを選局する。
With the operations described above, when a moving object such as a vehicle moves beyond the service area of television broadcast waves, it automatically searches for a channel with the same broadcast content and selects a channel with good reception.

〔案軸側〕[Draft side]

第7図は本発明の一実施例の回路ブロック図である。 FIG. 7 is a circuit block diagram of an embodiment of the present invention.

(11)アンテナ入力から入力されたテレビジョン放送
波は、(13)分配器の分配ロス及びS/N補償を目的
とした(12)アンテナブースターを経由して分配器で
2分配され、(14α)チューナ、(15α)17回路
、及び(14湯)チューナ、(15b)17回路へ並列
に供給される。
(11) The television broadcast wave input from the antenna input is divided into two parts by the distributor via (12) the antenna booster for the purpose of (13) distribution loss and S/N compensation of the distributor, and (14α ) tuner, (15α) 17 circuit, and (14 hot water) tuner, (15b) 17 circuit are supplied in parallel.

双方の工F回路出力は(16)IF出力切換回路でいず
れか一方が選択され、後段の(21)クロマ回路、(2
2)音声回路へ伝送される。
Either one of the outputs of the IF circuit is selected by the IF output switching circuit (16), and the output of the chroma circuit (21) at the subsequent stage is selected by the IF output switching circuit (16).
2) Transmitted to the audio circuit.

(51)映像信号判別回路は、(311)同期信号位相
差検出回路で双方の工F回路出力の映像信号の位相差を
検出し、その結果により(312α)(512h)遅延
回路の遅延量を制御して位相を合わせ、(313)誤差
増幅回路で比較して、出力がゼロに近ければ双方の工F
出力の映像信号変調内容が一致、すなわち同一放送内容
であると判別する。
(51) The video signal discrimination circuit detects the phase difference between the video signals output from both F circuits using the (311) synchronizing signal phase difference detection circuit, and based on the result, determines the delay amount of the (312α) (512h) delay circuit. Control and match the phase, compare it with the error amplification circuit (313), and if the output is close to zero, the F of both
It is determined that the output video signal modulation contents match, that is, they are the same broadcast contents.

(52)入力レベル判別回路は、双方の工F回路出力の
同期信号を基準としたタイミング信号により、垂直帰線
期間のペデスタルレベルの高域ノイズ成分を検出して垂
直期間内サンプルホールドし、双方のサンプルホールド
した結果を比較して、高域ノイズ成分が小さい方がS/
N比が良いと判別する。
(52) The input level discrimination circuit detects a high frequency noise component at the pedestal level during the vertical retrace period using a timing signal based on the synchronization signal of the output of both F circuits, samples and holds it within the vertical period, and Compare the sample-and-hold results of
It is determined that the N ratio is good.

本実施例の入力レベル判別回路は上記の方法で回路ブロ
ック図に記載しているが、別の方法としてAGO電圧比
較により、双方の17回路人力レベルを比較する方法も
可能である。
Although the input level discrimination circuit of this embodiment is shown in the circuit block diagram using the above method, it is also possible to compare the human power levels of both 17 circuits using AGO voltage comparison as another method.

(35)コントローラは、(551α)(531h)の
選局回路と、(532)制御マイコン、及び(555)
表示回路により構成される。
(35) The controller includes a tuning circuit (551α) (531h), a control microcomputer (532), and (555)
Consists of a display circuit.

(331α)選局回路で選局された(14α)チー−す
、(15α)17回路の出力が1F出力切換回路で後段
回路へ伝送されている場合、この糸を通常選局用とし、
(351b)選局回路、(14b)チューナ、(15b
)17回路の系を、同一放送内容サーチ選局用とし、常
時サーチ選局を行なう。
(331α) When the output of the (14α) CHEESE and (15α) 17 circuits selected by the tuning circuit is transmitted to the subsequent circuit by the 1F output switching circuit, this thread is used for normal tuning,
(351b) Tuning circuit, (14b) Tuner, (15b
) A system of 17 circuits is used for search and selection of the same broadcast content, and search and selection are always performed.

サーチ選局をして放送のあるチャンネルで一時停止し、
映像信号判別回路出力により、同一放送内容であるか否
かの判別を行なう。
Perform a search and pause on a broadcasting channel,
Based on the output of the video signal discrimination circuit, it is determined whether or not the broadcast contents are the same.

同一放送内容でない場合、及び同一放送内容であっても
通常選局用と同一チャンネルの場合、再度サーチ選局を
行ない、次の放送のあるチャンネルで一時停止し、同様
な動作を繰返す。
If the broadcast content is not the same, or if the same broadcast content is on the same channel as the normal channel selection, the search is performed again, the channel is temporarily stopped at the next broadcast channel, and the same operation is repeated.

通常選局用と異なるチャンネルで同一放送内容の場合、
人力レベル判別回路出力により、双方の工F回路出力の
いずれが人力レベルが大きく、S/N比が良いか判別す
る。
If the same broadcast content is on a different channel than the one for regular selection,
Based on the output of the human power level discriminating circuit, it is determined which of the two F circuit outputs has a higher human power level and a better S/N ratio.

この場合、移動体受信なのでアンテナ入力レベルは双方
のチャンネルがそれぞれ独立に時々刻々と変化しており
、瞬時の比較では正確な判別ができないので、実施例回
路は垂直帰間毎の人力レベル判別回路出力を一定時間内
アツブダウンカウントし、カウンタ出力により檀分、重
みづげをした判別を行なっている。
In this case, since it is mobile reception, the antenna input level changes from moment to moment for both channels independently, and accurate discrimination cannot be made by instantaneous comparison. Therefore, the embodiment circuit is a human power level discrimination circuit for each vertical return. The output is counted down within a certain period of time, and the output of the counter is used to perform a weighted judgment.

同一放送内容サーチ選局用の工F回路出力の方が映像信
号s / N比が悪いと判別した場合は、再度サーチ選
局をして当初の動作を繰返し、良いと判別した場合は、
工F出力切換回路を切換ると同時に、新たに選局したチ
ャンネルを表示回路出力によ’)、C25)スーパーイ
ンポーズ回路で原色信号に重畳して、一定時間表示する
If it is determined that the output of the F circuit for searching the same broadcast content has a worse video signal S/N ratio, search and select the same broadcast again and repeat the initial operation.
At the same time as switching the F output switching circuit, the newly selected channel is superimposed on the primary color signal by the display circuit output.

工F出力切換回路切換前の通常選局用、選局回路、チュ
ーナ、17回路は、切換後は同一放送内容サーチ選局用
となり、同様な動作を繰返す。
The circuit F output switching circuit for normal tuning, tuning circuit, tuner, and 17 circuits before switching will be used for tuning the same broadcast content search after switching, and the same operation will be repeated.

(34)スイッチ回路は、本発明の機能を停止させる回
路であり、停止時又は同一サービスエリア内移動の様に
本発明機能を必要としない場合の、省電力用(541)
ON  OFFスイッチと、同一放送内容チャンネルが
ないまま受信チャンネルのアンテナ入力レベルがサーチ
選局感度以下になった場合、及びトンネル内移動中の場
合等の誤動作を防止する(542)電子スイッチで構成
される。電子スイッチは、サーチ選局に用いる同期信号
有無判別信号により、受信チャンネルの同期信号なしと
判別した場合に、本発明の機能を停止する。
(34) The switch circuit is a circuit that stops the function of the present invention, and is used for power saving when the function of the present invention is not required, such as when stopped or when moving within the same service area (541)
It consists of an ON/OFF switch and an electronic switch (542) that prevents malfunctions such as when the antenna input level of the receiving channel falls below the search channel selection sensitivity without the same broadcast content channel, or when moving in a tunnel. Ru. The electronic switch stops the function of the present invention when it is determined that there is no synchronization signal of the receiving channel based on the synchronization signal presence/absence determination signal used for search channel selection.

〔発明の効果〕〔Effect of the invention〕

以上述べてきた様に本発明によれば、車両等移動体内で
使用されるテレビジョン受信機において、移動体が複数
のテレビジョン放送波のサービスエリアに跨って移動し
つつ、同一内容のテレビジョン放送を連続して視聴する
場合に、度々選局をして、同一内容で受信状態の良いチ
ャンネルを探す必要がなく、自動的に同一放送内容のチ
ャンネルを探し、受信状態の良好なチャンネルを選局す
るどい5効果を有する。
As described above, according to the present invention, in a television receiver used in a moving object such as a vehicle, while the moving object is moving across service areas of a plurality of television broadcast waves, When watching broadcasts continuously, there is no need to tune in frequently and search for channels with the same content and good reception. Instead, the system automatically searches for channels with the same broadcast content and selects the channel with good reception. It has a very sharp 5 effect.

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

第1図は本発明一実施例回路ブロック図。 (11)アンテナ入力 (12)アンテナブースター (15)分配器 (1aa)(1ab)チー、−−)− (15α)(15b)11回路 (16)工F出力切換回路 (21)クロマ回路 (22)音声回路 (23)スーパーインボーズ回路 (51)映像信号判別回路 (311)同期信号位相差検出回路 (312α)(312b)遅延回路 (S15)誤差増幅回路 (32)人力レベル判別回路 (ろ コントローラ a)(,531h)選局回路 )制御マイコン )表示回路 スイッチ回路 )ONOFFスイッチ )電子スイッチ FIG. 1 is a circuit block diagram of one embodiment of the present invention. (11) Antenna input (12) Antenna booster (15) Distributor (1aa) (1ab) Qi, --)- (15α) (15b) 11 circuits (16) Engineering F output switching circuit (21) Chroma circuit (22) Audio circuit (23) Superimpose circuit (51) Video signal discrimination circuit (311) Synchronous signal phase difference detection circuit (312α) (312b) Delay circuit (S15) Error amplification circuit (32) Human power level discrimination circuit (reactor controller a) (,531h) Tuning circuit ) Control microcomputer ) display circuit switch circuit )ONOFF switch ) electronic switch

Claims (2)

【特許請求の範囲】[Claims] (1)a)2組のチューナ、IF回路と、 b)双方のIF回路出力のいずれか一方を選択して後段
回路へ伝送する切換手段と、 c)双方のIF回路入力レベルのいずれが大きいかを判
別する手段と、 d)双方のIF回路出力の映像信号位相検出手段と、映
像信号比較手段により構成される、映像信号変調内容が
同一か否かを判別する手段と、e)前記2判別手段の出
力を入力として、2組のチューナの選局と、IF回路出
力の切換手段を制御するコントローラにより構成された
ことを特徴とする、移動体用ツインチューナテレビジョ
ン受信機。
(1) a) two sets of tuners and IF circuits, b) a switching means for selecting one of the outputs of both IF circuits and transmitting it to the subsequent circuit, and c) whichever of the input levels of both IF circuits is higher. d) means for determining whether the video signal modulation contents are the same, which is comprised of video signal phase detection means for both IF circuit outputs and video signal comparison means; and e) means for determining whether the video signal modulation contents are the same or not. 1. A twin tuner television receiver for a mobile object, comprising a controller that receives the output of the discriminator as an input and controls channel selection of two sets of tuners and IF circuit output switching means.
(2)双方のIF回路入力レベルのいずれが大きいかを
判別する手段を、双方のIF回路出力の映像信号S/N
比のいずれが良いか判別する手段に置換したことを特徴
とする請求項1記載の移動体用ツインチューナテレビジ
ョン受信機。
(2) The means for determining which of the two IF circuit input levels is higher is the video signal S/N of both IF circuit outputs.
2. The twin tuner television receiver for a mobile object according to claim 1, further comprising means for determining which of the ratios is better.
JP21772290A 1990-08-18 1990-08-18 Twin tuner television receiver for mobile body Pending JPH04100307A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21772290A JPH04100307A (en) 1990-08-18 1990-08-18 Twin tuner television receiver for mobile body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21772290A JPH04100307A (en) 1990-08-18 1990-08-18 Twin tuner television receiver for mobile body

Publications (1)

Publication Number Publication Date
JPH04100307A true JPH04100307A (en) 1992-04-02

Family

ID=16708716

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21772290A Pending JPH04100307A (en) 1990-08-18 1990-08-18 Twin tuner television receiver for mobile body

Country Status (1)

Country Link
JP (1) JPH04100307A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006035812A1 (en) 2004-09-30 2006-04-06 Matsushita Electric Industrial Co., Ltd. Digital broadcast reception device
JP2008109696A (en) * 2007-11-27 2008-05-08 Sharp Corp Broadcast receiving device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006035812A1 (en) 2004-09-30 2006-04-06 Matsushita Electric Industrial Co., Ltd. Digital broadcast reception device
EP1802123A1 (en) * 2004-09-30 2007-06-27 Matsusita Electric Industrial Co., Ltd. Digital broadcast reception device
EP1802123A4 (en) * 2004-09-30 2011-04-27 Panasonic Corp Digital broadcast reception device
US8094241B2 (en) 2004-09-30 2012-01-10 Panasonic Corporation Digital broadcast reception device and related method to determine programs included in receivable programs
JP2008109696A (en) * 2007-11-27 2008-05-08 Sharp Corp Broadcast receiving device
JP4621724B2 (en) * 2007-11-27 2011-01-26 シャープ株式会社 Broadcast receiver

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