JPH02217024A - Tuner channel selector - Google Patents
Tuner channel selectorInfo
- Publication number
- JPH02217024A JPH02217024A JP1038581A JP3858189A JPH02217024A JP H02217024 A JPH02217024 A JP H02217024A JP 1038581 A JP1038581 A JP 1038581A JP 3858189 A JP3858189 A JP 3858189A JP H02217024 A JPH02217024 A JP H02217024A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- local oscillator
- intermediate frequency
- tuner
- 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
Links
Landscapes
- Circuits Of Receivers In General (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は映像分野のチューナー選局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 a tuner selection device for the video field.
従来の技術
近年チューナー選局装置は映像分野の発達につれて益々
高性能化が要求されている。2. Description of the Related Art In recent years, tuner selection devices are required to have increasingly higher performance as the video field develops.
以下図面を参照しながら従来のチューナー選局装置の一
例について説明する。An example of a conventional tuner selection device will be described below with reference to the drawings.
第２図は、従来のチューナー選局装置を示すものである
。第２図において、１は前置増幅器、２は第一周波数変
換器、３は第一中間周波数増幅器、４は第２周波数変換
器、５は第２中間周波数増幅器、６は第一局部発振器、
７は第２局部発振器、８は水晶発振子発振回路、９は基
準分周器、１０゜１４は位相比較器、１１．１５は低域
ろ波器、１２゜１６は前置分周器、１３．１７は可変分
周器を示し、図の破線は、チューナー筐体を示し、端子
ａないしｆは接続端子を示すものである。FIG. 2 shows a conventional tuner selection device. In FIG. 2, 1 is a preamplifier, 2 is a first frequency converter, 3 is a first intermediate frequency amplifier, 4 is a second frequency converter, 5 is a second intermediate frequency amplifier, 6 is a first local oscillator,
7 is a second local oscillator, 8 is a crystal oscillator oscillation circuit, 9 is a reference frequency divider, 10° 14 is a phase comparator, 11.15 is a low-pass filter, 12° 16 is a pre-frequency divider, Reference numerals 13 and 17 indicate a variable frequency divider, the broken line in the figure indicates a tuner housing, and terminals a to f indicate connection terminals.
以上のように構成されたチューナー選局装置について、
以下その動作について説明する。Regarding the tuner selection device configured as above,
The operation will be explained below.
３・＼−ジ
まず、入力信号は、端子ａより与えられ、前置増幅器１
を介して第一周波数変換器２に与えられる。第一周波数
変換器２は入力信号を第一局部発振器６出力とによシ第
１中間周波数に変換して第一中間周波数増幅器３に供給
する。第一局部発振器６は前置分周器１２により固定分
周され、その分周出力が可変分周器１３により可変分周
される。3. First, the input signal is given from terminal a, and the input signal is applied to the preamplifier 1.
is applied to the first frequency converter 2 via. The first frequency converter 2 converts the input signal into a first intermediate frequency using the output of the first local oscillator 6, and supplies the converted signal to the first intermediate frequency amplifier 3. The first local oscillator 6 is fixedly frequency-divided by a pre-frequency divider 12, and its frequency-divided output is variably divided by a variable frequency divider 13.
可変分周器１３の出力は位相比較器１０によシ水晶発振
回路８で生じた基準発振周波数を基準分周器９により分
周した出力と位相比較する。位相比較器１ｏの検出出力
は低域ろ波器１１を介して端子Ｃより第一局部発振器６
にフィードバックされ周波数制御が行なわれる。第一局
部発振器６の発振周波数は、入力信号の周波数よシ第−
中間周波数だけ高い周波数になるように可変分周器１３
の分局比率を設定する。The phase comparator 10 compares the phase of the output of the variable frequency divider 13 with the output obtained by dividing the reference oscillation frequency generated by the crystal oscillation circuit 8 by the reference frequency divider 9. The detection output of the phase comparator 1o is sent from the terminal C to the first local oscillator 6 via the low-pass filter 11.
is fed back to perform frequency control. The oscillation frequency of the first local oscillator 6 is the same as the frequency of the input signal.
A variable frequency divider 13 so that only the intermediate frequency becomes a higher frequency.
Set the branch ratio.
第一周波数変換器２の出力は第一中間周波数増幅器３を
介して第２周波数変換器４に供給され、第２局部発振器
７の発振周波数との間で周波数変換され、第２中間周波
数を得て、第２中間周波数増幅器を介して端子ｅより出
力を得る。第２局部発振器７の発振周波数は端子ｆより
前置分周器１６に供給され、その出力は可変分周器１７
を介して位相比較器１４によシ基準分周器９の信号と位
相比較され、その検出出力が低域ろ波器１６を介して端
子ｄより第２局部発振器７にフィードバックされ発振周
波数が制御される。The output of the first frequency converter 2 is supplied to the second frequency converter 4 via the first intermediate frequency amplifier 3, where it is frequency-converted between the oscillation frequency of the second local oscillator 7 and a second intermediate frequency. Then, an output is obtained from the terminal e via the second intermediate frequency amplifier. The oscillation frequency of the second local oscillator 7 is supplied to the prefrequency divider 16 from the terminal f, and its output is fed to the variable frequency divider 17.
The phase comparator 14 compares the phase with the signal from the reference frequency divider 9 via the phase comparator 14, and the detected output is fed back to the second local oscillator 7 from the terminal d via the low-pass filter 16 to control the oscillation frequency. be done.
発明が解決しようとする課題
しかしながら上記のような構成では、第２局部発振器の
発振出力を、チューナー筐体に固定された端子ｆを外部
の前置分周器１６に接続する必要がある。このようなチ
ューナー選局装置において外部回路と接続する場合、貫
通コンデンサ等を用いることはさけられず、多数の外部
接続部分を有すると、チューナー筐体の設計を複雑にす
るという課題があった。本発明は上記課題に鑑み、チュ
ーナー金具の構成が簡単で、それでいて従来と同様の機
能を有するチューナー選局装置を提供しようとするもの
である。Problems to be Solved by the Invention However, in the above configuration, it is necessary to connect the oscillation output of the second local oscillator to the external prefrequency divider 16 through the terminal f fixed to the tuner housing. When such a tuner selection device is connected to an external circuit, the use of a feedthrough capacitor or the like is unavoidable, and having a large number of external connection parts poses the problem of complicating the design of the tuner housing. In view of the above-mentioned problems, the present invention aims to provide a tuner selection device having a simple tuner metal fitting and having the same functions as conventional ones.
課題を解決するだめの手段
５１＼−７
上記課題を解決するために本発明のチューナー選局装置
は少なくとも２つ以上の局部発振器を有し、入力信号を
増幅した後、−具入力信号よりも高い周波数に周波数変
換し、これを第１中間周波数の帯域を増幅する増幅器を
介して第２の周波数変換器によシ第２の中間周波数に変
換する機能を備えたチューナー選局装置において、第２
の局部発振器信号は第２の中間周波数増幅器出力を分周
器２位相比較器へとフィードバックすることによシ位相
制御する構成を備えたものである。Means for Solving the Problems 51\-7 In order to solve the above problems, the tuner selection device of the present invention has at least two or more local oscillators, and after amplifying the input signal, In a tuner selection device having a function of converting a frequency to a high frequency and converting it to a second intermediate frequency by a second frequency converter via an amplifier that amplifies a band of the first intermediate frequency, 2
The local oscillator signal is configured to control the phase by feeding back the output of the second intermediate frequency amplifier to the frequency divider-two phase comparator.
作 用
本発明は上記した構成によって、第２局部発振周波数を
第２中間周波数増幅器の出力に漏洩する第２局部発振器
周波数信号を得て、この信号をチューナー金具との接続
端子を介してチューナーと外部回路とを接続することに
よシ接続端子の数を削減できるものである。Effect of the Invention With the above-described configuration, the present invention obtains a second local oscillator frequency signal that leaks the second local oscillation frequency to the output of the second intermediate frequency amplifier, and transmits this signal to the tuner via the connection terminal with the tuner fitting. By connecting to an external circuit, the number of connection terminals can be reduced.
実施例
以下図面を参照しながら本発明のチューナー選局装置の
一例について説明する。第１図は本発明６ ・・−／
の一実施例におけるチューナー選局装置のブロック図で
ある。Embodiment Hereinafter, an example of a tuner selection device of the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram of a tuner selection device according to an embodiment of the present invention 6.
第１図において、１は前置増幅器、２は第一周波数変換
器、３は第一中間周波数増幅器、４は第２周波数変換器
、６は第２中間周波数増幅器、６は第一局部発振器、７
は第２局部発振器、８は水晶発振子発振回路、９は基準
分周器、１０．１４は位相比較器、１１．１５は低域ろ
波器、１２゜１６は前置分周器、１３．１７は可変分周
器を示し、図の破線は、チューナー筐体を示し、端子ａ
ないしｅは接続端子を示すものである。本実施例の特徴
は前置分周器１６への入力を第２中間周波増幅器５の出
力から得た点にある。In FIG. 1, 1 is a preamplifier, 2 is a first frequency converter, 3 is a first intermediate frequency amplifier, 4 is a second frequency converter, 6 is a second intermediate frequency amplifier, 6 is a first local oscillator, 7
is a second local oscillator, 8 is a crystal oscillator oscillation circuit, 9 is a reference frequency divider, 10.14 is a phase comparator, 11.15 is a low-pass filter, 12° 16 is a pre-frequency divider, 13 .17 indicates a variable frequency divider, the broken line in the figure indicates the tuner housing, and the terminal a
to e indicate connection terminals. The feature of this embodiment is that the input to the prefrequency divider 16 is obtained from the output of the second intermediate frequency amplifier 5.
以上のように構成されたチューナー選局装置について、
以下その動作について説明する。Regarding the tuner selection device configured as above,
The operation will be explained below.
まず、入力信号は、端子ａより与えられ、前置増幅器１
を介して第一周波数変換器２に与えられる。第一周波数
変換器２は入力信号を第一局部発振器とによシ第−中間
周波数に変換して第一中間周波数増幅器３に供給する。First, an input signal is given from terminal a, and the preamplifier 1
is applied to the first frequency converter 2 via. The first frequency converter 2 converts the input signal into a second intermediate frequency using a first local oscillator and supplies the converted signal to a first intermediate frequency amplifier 3.
第一局部発振器６は７ ・＼−ノ
前置分周器１２により固定分周され、その分周出力が可
変分周器１３によシ可変分周される。可変分周器１３の
出力は位相比較器１０によシ水晶発振回路で生じた基準
発振周波数を基準分周器により分周した出力と位相比較
する。位相比較器１０の検出出力は低域ろ波器を介して
端子Ｃより前記第一局部発振器６の周波数制御を行なう
。第一局部発振器の発振周波数は、入力信号の周波数よ
り第一中間周波数だけ高い周波数になるように可変分周
器１３の分局比率を設定する。The first local oscillator 6 is fixedly frequency-divided by a pre-frequency divider 12, and the frequency-divided output thereof is variably divided by a variable frequency divider 13. The phase comparator 10 compares the phase of the output of the variable frequency divider 13 with the output obtained by dividing the reference oscillation frequency generated by the crystal oscillation circuit by the reference frequency divider. The detection output of the phase comparator 10 is applied to the terminal C via a low-pass filter to control the frequency of the first local oscillator 6. The division ratio of the variable frequency divider 13 is set so that the oscillation frequency of the first local oscillator is higher than the frequency of the input signal by the first intermediate frequency.
第一周波数変換器２の出力は第一中間周波数増幅器を介
して第２周波数変換器４に供給され、第２局部発振器７
の発振周波数との間で周波数変換され、第２中間周波数
を得て、第２中間周波数増幅器を介して端子ｅよシ出力
を得る。第２局部発振器７の発振周波数は第２中間周波
数増幅器５を介して漏洩する第２局部発振器周波数信号
を端子ｅを介して前置分周器１６に供給し、その出力を
可変分周器１７に供給する。尚前置分周器１６と可変分
周器１７は一体化されたものでもよく、分周器は第２局
部発振器周波数の帯域増幅器を含んだものでも良い。分
周器の周波数は位相比較器１４によシ基準分周器９の信
号と位相比較され、その検出出力が低域ろ波器１５を介
して端子ｄより前記第２局部発振器７の発振周波数を制
御する。The output of the first frequency converter 2 is supplied to a second frequency converter 4 via a first intermediate frequency amplifier, and a second local oscillator 7
The frequency is converted between the oscillation frequency of the oscillation frequency, a second intermediate frequency is obtained, and an output from the terminal e is obtained via the second intermediate frequency amplifier. The oscillation frequency of the second local oscillator 7 is determined by supplying the leaked second local oscillator frequency signal via the second intermediate frequency amplifier 5 to the pre-frequency divider 16 via the terminal e, and transmitting its output to the variable frequency divider 17. supply to. Note that the prefrequency divider 16 and the variable frequency divider 17 may be integrated, or the frequency divider may include a band amplifier of the second local oscillator frequency. The frequency of the frequency divider is phase-compared with the signal of the reference frequency divider 9 by the phase comparator 14, and the detected output is sent to the terminal d via the low-pass filter 15 at the oscillation frequency of the second local oscillator 7. control.
尚、位相比較器１４に与える比較信号は、第一局部発振
器を制御する水晶発振器８の分局信号とは別経路の信号
を与えても良い。Note that the comparison signal given to the phase comparator 14 may be a signal on a different path from the branch signal of the crystal oscillator 8 that controls the first local oscillator.
以上のように本実施例によれば２局部発振器の発振周波
数を位相制御するための信号として、第２中間周波数増
幅器の出力に漏洩する第２局部発振器周波数信号を得て
この信号をチューナー金具との接続端子を介してチュー
ナーと外部回路（前置分周器、可変分周器）とを接続す
ることにより、接続端子の数を削減できるものである。As described above, according to this embodiment, the second local oscillator frequency signal leaking to the output of the second intermediate frequency amplifier is obtained as a signal for controlling the phase of the oscillation frequency of the two local oscillators, and this signal is transmitted to the tuner fitting. By connecting the tuner and an external circuit (pre-frequency divider, variable frequency divider) through the connection terminals, the number of connection terminals can be reduced.
その結果、チューナー筐体の外部接続部分すなわち貫通
コンデンサを用いた接続箇所を削減でき部品のコストを
削減でき、より高周波的にも安定した、簡単な構造のチ
ューナー選局装置を実現できる。As a result, external connection parts of the tuner housing, that is, connection points using feedthrough capacitors, can be reduced, the cost of parts can be reduced, and a tuner selection device with a simple structure that is more stable at high frequencies can be realized.
発明の効果
９Ｉ＼−７
以上のように本発明は、局部発振器に直結した分周器か
らの出力周波数と、第２中間周波数増幅器出力を分周器
に入力して得た分周器出力周波数とを位相比較して前記
局部発振器の周波数を制御・・・・・・位相比較器、１
１
１６・・・・・・前置分周器、Effect of the Invention 9I\-7 As described above, the present invention provides a frequency divider output frequency obtained by inputting the output frequency from the frequency divider directly connected to the local oscillator and the output of the second intermediate frequency amplifier to the frequency divider. Control the frequency of the local oscillator by comparing the phase with... Phase comparator, 1
1 16... Prescaler,
Claims (1)
幅した後、一旦入力信号よりも高い周波数に周波数変換
し、此れを第１中間周波数の帯域を増幅する第１中間周
波増幅器を介して第２の周波数変換器により第２の中間
周波数に変換し、この第２の中間周波数信号を第２中間
周波増幅器により増幅するチューナー選局装置であって
、基準発振器の出力を分周する基準分周器出力周波数と
、前記局部発振器出力を分周する分周器出力周波数とを
位相比較し、前記局部発振器の周波数を制御すると共に
、前記第２の局部発振器は、チューナー筐体内に収納さ
れた第２中間周波数増幅器出力をチューナー筐体に外部
接続された分周器に供給して位相制御するようにしたこ
とを特徴とするチューナー選局装置。It has at least two local oscillators, and after amplifying the input signal, converts the frequency to a higher frequency than the input signal, and then transmits the signal through a first intermediate frequency amplifier that amplifies the first intermediate frequency band. A tuner selection device that converts the signal to a second intermediate frequency using a second frequency converter and amplifies the second intermediate frequency signal using a second intermediate frequency amplifier, the tuner selecting device converting the signal to a second intermediate frequency using a second frequency converter and amplifying the second intermediate frequency signal using a second intermediate frequency amplifier. A frequency divider output frequency and a frequency divider output frequency that divides the local oscillator output are phase-compared to control the frequency of the local oscillator, and the second local oscillator is housed in a tuner housing. A tuner channel selection device characterized in that the output of the second intermediate frequency amplifier is supplied to a frequency divider externally connected to the tuner housing for phase control.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1038581A JPH02217024A (en) | 1989-02-17 | 1989-02-17 | Tuner channel selector |
| EP90102855A EP0385181B1 (en) | 1989-02-17 | 1990-02-14 | Tuner station selecting apparatus |
| DE69020598T DE69020598T2 (en) | 1989-02-17 | 1990-02-14 | Tuner for tuning to selected stations. |
| CA002010176A CA2010176C (en) | 1989-02-17 | 1990-02-15 | Tuner station selecting apparatus |
| US07/481,563 US5179729A (en) | 1989-02-17 | 1990-02-20 | Tuner station selecting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1038581A JPH02217024A (en) | 1989-02-17 | 1989-02-17 | Tuner channel selector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02217024A true JPH02217024A (en) | 1990-08-29 |
Family
ID=12529258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1038581A Pending JPH02217024A (en) | 1989-02-17 | 1989-02-17 | Tuner channel selector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02217024A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06204906A (en) * | 1993-01-07 | 1994-07-22 | Matsushita Electric Ind Co Ltd | Double super tuner |
| KR100396120B1 (en) * | 2001-06-18 | 2003-08-27 | 엘지이노텍 주식회사 | Dbs tuner having amplitude circuit for matching |
-
1989
- 1989-02-17 JP JP1038581A patent/JPH02217024A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06204906A (en) * | 1993-01-07 | 1994-07-22 | Matsushita Electric Ind Co Ltd | Double super tuner |
| US5457817A (en) * | 1993-01-07 | 1995-10-10 | Matsushita Electric Industrial Co., Ltd. | Tuner of a double superheterodyne receiver |
| KR100396120B1 (en) * | 2001-06-18 | 2003-08-27 | 엘지이노텍 주식회사 | Dbs tuner having amplitude circuit for matching |
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