JPH11274872A - Television receiver - Google Patents
Television receiverInfo
- Publication number
- JPH11274872A JPH11274872A JP7214098A JP7214098A JPH11274872A JP H11274872 A JPH11274872 A JP H11274872A JP 7214098 A JP7214098 A JP 7214098A JP 7214098 A JP7214098 A JP 7214098A JP H11274872 A JPH11274872 A JP H11274872A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- microcomputer
- rfagc
- tuner
- 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
Landscapes
- Control Of Amplification And Gain Control (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はテレビジョン受像機
に関し、特に送信チャンネルの周波数のずれを補正し選
局する回路を有するもの、また、補正された選局信号を
記憶するようにしたものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly, to a television receiver having a circuit for correcting a frequency shift of a transmission channel and selecting a channel, and storing a corrected channel selection signal. .
【０００２】[0002]
【従来の技術】テレビジョン受像機の基本的な構成を図
３に示して説明する。まず、アンテナ１より入力された
ＲＦ信号は、マイコン５からの選局信号によりチュ−ナ
−２でチャンネル選局される。チュ−ナ−から出力され
るＩＦ信号はＩＦ回路３においてべ−スバンド信号に変
換され出力される。ＲＦＡＧＣ回路４ではＲＦ信号から
入力電界の強弱を判断してＲＦＡＧＣ制御信号によりチ
ュ−ナ−２の利得を制御する。ＩＦ回路３では送信信号
の搬送波とＩＦ回路３内部での局発信号の差により生じ
る制御電圧（ＡＦＴ電圧）をつくる。このＡＦＴ電圧を
マイコン５で判断しチュ−ナ−２への選局信号を補正
し、送信信号の周波数のずれを補正する。2. Description of the Related Art The basic structure of a television receiver will be described with reference to FIG. First, the RF signal input from the antenna 1 is channel-selected by the tuner-2 according to the channel selection signal from the microcomputer 5. The IF signal output from the tuner is converted into a base band signal in the IF circuit 3 and output. The RFAGC circuit 4 determines the strength of the input electric field from the RF signal and controls the gain of the tuner-2 by the RFAGC control signal. The IF circuit 3 generates a control voltage (AFT voltage) generated by the difference between the carrier of the transmission signal and the local signal inside the IF circuit 3. The AFT voltage is determined by the microcomputer 5, and the tuning signal to the tuner-2 is corrected to correct the frequency deviation of the transmission signal.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、送信信
号の搬送波の信号レベルが小さい場合、ＩＦ回路におい
て、ＡＦＴ電圧を生成することができず、マイコンによ
り送信信号の周波数のずれを補正することができないと
いう課題を有していた。However, when the signal level of the carrier of the transmission signal is low, the AFT voltage cannot be generated in the IF circuit, and the microcomputer cannot correct the deviation of the frequency of the transmission signal. There was a problem that.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するた
め、本発明のテレビジョン受像機は、ＲＦＡＧＣ回路よ
り出力される制御信号によりマイコンよりチュ−ナ−に
出力される選局信号を制御し、送信信号のずれを補正す
る手段を有する。In order to solve the above problems, a television receiver according to the present invention controls a channel selection signal output from a microcomputer to a tuner by a control signal output from an RFAGC circuit. And means for correcting a shift of the transmission signal.
【０００５】本発明によれば、送信信号の搬送波のレベ
ルが小さい場合にも、高速に送信信号のずれを補正する
ことが可能となる。According to the present invention, even if the level of the carrier of the transmission signal is small, it is possible to correct the deviation of the transmission signal at high speed.
【０００６】[0006]
【発明の実施の形態】本発明の第１の発明は、アンテナ
の入力ＲＦ信号の電界強度に応じチュ−ナ−の利得を制
御するＲＦＡＧＣ回路とマイコンより送られる信号によ
りチュ−ナ−の選局チャンネルを制御する選局回路を備
えるテレビジョン受像機において、ＲＦＡＧＣ回路より
出力されるＲＦＡＧＣ制御信号によりマイコンより出力
される選局信号を制御する手段を有することを特徴とす
るテレビジョン受像機としたものであり、送信信号の搬
送波のレベルが小さい場合にも、高速に送信信号のずれ
を補正することができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first aspect of the present invention is an RFAGC circuit for controlling the gain of a tuner according to the electric field strength of an input RF signal of an antenna, and a tuner selection by a signal sent from a microcomputer. A television receiver comprising a channel selection circuit for controlling a station channel, comprising: means for controlling a channel selection signal output from a microcomputer by an RFAGC control signal output from an RFAGC circuit. Therefore, even when the level of the carrier of the transmission signal is small, the shift of the transmission signal can be corrected at high speed.
【０００７】さらに、第２の発明は、ＲＦＡＧＣ回路よ
り出力されるＲＦＡＧＣ制御信号によりマイコンよりチ
ュ−ナ−に送られる補正された選局信号をメモリ−に記
憶する手段を有することを特徴とする第１の発明に記載
のテレビジョン受像機としたもので、より高速な選局を
行うことができる。。Further, the second invention is characterized in that there is provided a means for storing, in a memory, a corrected channel selection signal sent to the tuner from the microcomputer by an RFAGC control signal output from the RFAGC circuit. According to the television receiver of the first aspect, it is possible to perform higher-speed channel selection. .
【０００８】[0008]
【実施例】以下、本発明の実施例におけるテレビジョン
受像機について図１を参照しながら説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a television receiver according to an embodiment of the present invention will be described with reference to FIG.
【０００９】（実施例１）図１は本発明の第１の実施例
におけるテレビジョン受像機のブロック構成図を示す。
基本的な回路構成は図３と同様である。図１において、
マイコン５にはＲＦＡＧＣ回路４よりＲＦＡＧＣ制御信
号が送られる。従来とは違って本実施例の場合、マイコ
ン５にＲＦＡＧＣ回路４より制御信号を送ることにより
送信信号の搬送波のレベルが小さい場合にも、高速に送
信信号のずれを補正する。(Embodiment 1) FIG. 1 is a block diagram of a television receiver according to a first embodiment of the present invention.
The basic circuit configuration is the same as in FIG. In FIG.
An RFAGC control signal is sent from the RFAGC circuit 4 to the microcomputer 5. Unlike the conventional case, in the present embodiment, the control signal is sent from the RFAGC circuit 4 to the microcomputer 5 to correct the shift of the transmission signal at high speed even when the carrier level of the transmission signal is small.
【００１０】（実施例２）次に実施例２について図２を
参照しながら説明する。図２は本発明の第２の実施例に
おけるテレビジョン受像機のブロック構成図を示す。基
本的な回路構成は図３と同様である。実施例２では、Ｒ
ＦＡＧＣ回路４からのＲＦＡＧＣ制御信号により送信信
号のずれを補正したマイコンの選局信号をメモリ−６に
記憶する。本実施例の場合、再選局時にメモリ−６に記
憶された制御信号を用いて選局することにより、より高
速な選局を行うことができる。(Embodiment 2) Next, Embodiment 2 will be described with reference to FIG. FIG. 2 shows a block diagram of a television receiver according to a second embodiment of the present invention. The basic circuit configuration is the same as in FIG. In the second embodiment, R
The channel selection signal of the microcomputer in which the shift of the transmission signal is corrected by the RFAGC control signal from the FAGC circuit 4 is stored in the memory-6. In the case of the present embodiment, by selecting a channel using the control signal stored in the memory 6 at the time of re-selection, a higher-speed channel selection can be performed.
【００１１】[0011]
【発明の効果】本発明のテレビジョン受像機では、マイ
コンにＲＦＡＧＣ回路より制御信号を送ることにより送
信信号の搬送波のレベルが小さい場合にも、高速に送信
信号のずれを補正することができる。また、ＲＦＡＧＣ
回路からの制御信号により送信信号のずれを補正したマ
イコンの選局信号をメモリ−に記憶する。本実施例の場
合、再選局時にメモリ−に記憶された制御信号を用いて
選局することにより、より高速な選局を行うことができ
る。According to the television receiver of the present invention, by transmitting a control signal from the RFAGC circuit to the microcomputer, even if the level of the carrier wave of the transmission signal is small, the deviation of the transmission signal can be corrected at high speed. Also, RFAGC
The channel selection signal of the microcomputer, in which the shift of the transmission signal is corrected by the control signal from the circuit, is stored in the memory. In the case of this embodiment, a higher-speed tuning can be performed by selecting a channel using a control signal stored in the memory at the time of re-selection.
【図１】本発明の一実施例におけるテレビジョン受像機
のブロック構成図FIG. 1 is a block diagram of a television receiver according to an embodiment of the present invention.
【図２】本発明の一実施例におけるテレビジョン受像機
のブロック構成図FIG. 2 is a block diagram of a television receiver according to an embodiment of the present invention.
【図３】従来のテレビジョン受像機のブロック構成図FIG. 3 is a block diagram of a conventional television receiver.
１ アンテナ ２ チュ−ナ− ３ ＩＦ回路 ４ ＲＦＡＧＣ回路 ５ マイコン ６ メモリ− DESCRIPTION OF SYMBOLS 1 Antenna 2 Tuner 3 IF circuit 4 RFAGC circuit 5 Microcomputer 6 Memory
Claims (2)
じチュ−ナ−の利得を制御するＲＦＡＧＣ回路とマイコ
ンより送られる選局信号によりチュ−ナ−の選局チャン
ネルを制御する選局回路を備えるテレビジョン受像機に
おいて、上記ＲＦＡＧＣ回路より出力されるＲＦＡＧＣ
制御信号により、マイコンよりチュ−ナ−に送られる選
局信号を制御し、送信信号の周波数のずれを補正する手
段を有することを特徴とするテレビジョン受像機。An RFAGC circuit for controlling a gain of a tuner according to an electric field strength of an RF signal input to an antenna and a tuning circuit for controlling a tuning channel of a tuner by a tuning signal sent from a microcomputer. RFAGC output from said RFAGC circuit in a television receiver provided with
A television receiver comprising means for controlling a tuning signal sent from a microcomputer to a tuner by a control signal to correct a frequency shift of a transmission signal.
Ｃ制御信号によりマイコンよりチュ−ナ−に送られる補
正された選局信号をメモリ−に記憶する手段を有するこ
とを特徴とする請求項１記載のテレビジョン受像機。2. An RFAG output from an RFAGC circuit
2. The television receiver according to claim 1, further comprising means for storing, in a memory, a corrected tuning signal sent from the microcomputer to the tuner by the C control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7214098A JPH11274872A (en) | 1998-03-20 | 1998-03-20 | Television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7214098A JPH11274872A (en) | 1998-03-20 | 1998-03-20 | Television receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11274872A true JPH11274872A (en) | 1999-10-08 |
Family
ID=13480694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7214098A Pending JPH11274872A (en) | 1998-03-20 | 1998-03-20 | Television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11274872A (en) |
-
1998
- 1998-03-20 JP JP7214098A patent/JPH11274872A/en active Pending
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