JPH0818477A - Receiver - Google Patents
ReceiverInfo
- Publication number
- JPH0818477A JPH0818477A JP6153388A JP15338894A JPH0818477A JP H0818477 A JPH0818477 A JP H0818477A JP 6153388 A JP6153388 A JP 6153388A JP 15338894 A JP15338894 A JP 15338894A JP H0818477 A JPH0818477 A JP H0818477A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- carrier
- fin
- fbb
- 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.)
- Withdrawn
Links
Landscapes
- Superheterodyne Receivers (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は受信装置に関し、特にＡ
ＦＣ（自動周波数制御）機能を有する受信装置に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver, and in particular to A
The present invention relates to a receiver having an FC (automatic frequency control) function.
【０００２】[0002]
【従来の技術】従来のこの種の受信装置のブロック図を
図２に示す。受信信号ＩＮは局部発振器１の局発信号と
ミキサ８にて周波数混合されることにより中間周波数信
号に変換される。この中間周波数信号は復調器９におい
て周波数検波されることによりベースバンド信号に変換
され復調される。2. Description of the Related Art A block diagram of a conventional receiving apparatus of this type is shown in FIG. The reception signal IN is frequency-mixed with the local oscillation signal of the local oscillator 1 by the mixer 8 to be converted into an intermediate frequency signal. This intermediate frequency signal is frequency-detected by the demodulator 9 to be converted into a baseband signal and demodulated.
【０００３】このベースバンド信号に含まれる搬送波成
分を用いて搬送波再生回路７にて搬送波信号が再生さ
れ、復調器９では、この再生搬送波信号を用いて中間周
波数信号からベースバンド信号が検波復調されるように
なっている。The carrier wave signal contained in the base band signal is used to reproduce the carrier wave signal in the carrier wave reproducing circuit 7, and the demodulator 9 uses the reproduced carrier wave signal to detect and demodulate the base band signal from the intermediate frequency signal. It has become so.
【０００４】ＡＦＣ制御回路１２は、復調されたベース
バンド信号よりこの復調データの周波数成分を検出し、
搬送波再生回路７における再生搬送波信号の周波数を制
御するものであり、このＡＦＣフィードバックループに
より復調データにおける周波数成分を零となる様になっ
ている。The AFC control circuit 12 detects the frequency component of this demodulated data from the demodulated baseband signal,
The frequency of the reproduced carrier signal in the carrier recovery circuit 7 is controlled, and the frequency component in the demodulated data becomes zero by this AFC feedback loop.
【０００５】局部発振器１は周知のＰＬＬ周波数シンセ
サイザ構成であり、ＶＣＯ（電圧制御発振器２）の発振
信号は分周回路３にて１／Ｎに分周され、位相比較回路
４の一入力となる。一方、基準周波数発振回路１０が設
けられており、この基準周波数信号は分周器１１にて１
／Ｍに分周され、位相比較器４の他入力となる。The local oscillator 1 has a well-known PLL frequency synthesizer configuration, and the oscillation signal of the VCO (voltage controlled oscillator 2) is divided into 1 / N by the frequency dividing circuit 3 and becomes one input of the phase comparison circuit 4. . On the other hand, a reference frequency oscillator circuit 10 is provided, and the reference frequency signal
/ M, and becomes the other input of the phase comparator 4.
【０００６】位相比較器４においては、両入力信号の周
波数及び位相比較が行われ、この比較結果がループフィ
ルタ６を介して直流電圧となってＶＣＯ２の制御電圧と
なるのである。In the phase comparator 4, the frequency and phase of both input signals are compared, and the comparison result becomes a DC voltage via the loop filter 6 and becomes a control voltage of the VCO 2.
【０００７】この受信装置の受信周波数（チャネル）を
変更する場合には、周波数シンセサイザ１の分周回路３
の分周比（１／Ｎ）を分周比設定情報に従って変更する
ことで、ＶＣＯ２の発振周波数が変更され、結果として
中間周波数が変更され、所望の受信周波数（チャネル）
の選択が可能となっている。When changing the reception frequency (channel) of this receiving device, the frequency dividing circuit 3 of the frequency synthesizer 1 is used.
By changing the frequency division ratio (1 / N) according to the frequency division ratio setting information, the oscillation frequency of the VCO 2 is changed, and as a result, the intermediate frequency is changed, and the desired reception frequency (channel) is changed.
Can be selected.
【０００８】ここで、受信信号周波数をｆIN，局部発振
周波数をｆL ，基準周波数をｆR ，中間周波数をｆIF，
再生搬送周波数をｆC ，復調データ信号の周波数をｆBB
とすると、 ｆIF＝ｆL −ｆIN ……（１） ｆL ＝（Ｎ／Ｍ）ｆR ……（２） ｆBB＝ｆIF−ｆC ……（３） なる式が成立する。Here, the received signal frequency is fIN, the local oscillation frequency is fL, the reference frequency is fR, the intermediate frequency is fIF,
The reproduction carrier frequency is fC and the frequency of the demodulated data signal is fBB.
Then, fIF = fL-fIN (1) fL = (N / M) fR (2) fBB = fIF-fC (3)
【０００９】従って、（３）式では、 ｆBB＝（Ｎ／Ｍ）ｆR −ｆIN−ｆC ……（４） となり、ｆBB＝０となるには、 （Ｎ／Ｍ）ｆR −ｆIN−ｆC ＝０ ……（５） となる必要があり、（５）式において周波数の変動成分
Δｆのみを考えると、（Ｎ／Ｍ）ｆR は定数であり変動
成分は零とみなせるので、 ΔｆIN＝ΔｆC ……（６） となる。Therefore, in the equation (3), fBB = (N / M) fR-fIN-fC ... (4), and to obtain fBB = 0, (N / M) fR-fIN-fC = 0 ... It is necessary to be (5), and considering only the frequency fluctuation component Δf in the formula (5), (N / M) fR is a constant and the fluctuation component can be regarded as zero, so ΔfIN = ΔfC (6) Becomes
【００１０】すなわち、受信信号ｆINの変動成分ΔｆIN
は、図２の回路構成では、再生搬送周波数ｆC の可変範
囲ΔｆC に等しくなっており、換言すればこのＡＦＣ方
式では、受信信号の変動はΔｆC と等しい変動量だけ吸
収可能であることが判る。That is, the fluctuation component ΔfIN of the received signal fIN
2 is equal to the variable range ΔfC of the reproduction carrier frequency fC in the circuit configuration of FIG. 2, that is, in this AFC method, the fluctuation of the received signal can be absorbed by the fluctuation amount equal to ΔfC.
【００１１】[0011]
【発明が解決しようとする課題】この様に、図２に示す
従来のＡＦＣ回路を用いた受信装置では、受信周波数ｆ
INの変動を、最大でも再生搬送周波数の可変範囲分Δｆ
C しか吸収できないという問題がある。As described above, in the receiver using the conventional AFC circuit shown in FIG. 2, the reception frequency f
The variation of IN is at most Δf of the variable range of the reproduction carrier frequency.
There is a problem that only C can be absorbed.
【００１２】本発明の目的は、受信信号の周波数変動成
分の吸収可能量をより大とすることができる受信装置を
提供することである。An object of the present invention is to provide a receiving apparatus capable of increasing the absorbable amount of the frequency fluctuation component of the received signal.
【００１３】[0013]
【課題を解決するための手段】本発明によれば、周波数
シンセサイザ方式の局部発振手段と、この局部発振信号
を用いて受信信号を中間周波数信号に変換する周波数変
換手段と、この中間周波数信号から受信搬送波信号を再
生する搬送波再生手段と、この再生搬送波信号を使用し
て前記中間周波数信号をベースバンド信号に変換する手
段と、このベースバンド信号に含まれる搬送波成分を検
出して前記搬送波再生手段の再生搬送波信号の周波数を
制御する自動周波数制御手段とを含む受信装置であっ
て、前記局部発振手段の基準信号源として前記再生搬送
波信号を用いることを特徴とする受信装置が得られる。According to the present invention, a local synthesizer of a frequency synthesizer system, a frequency converter for converting a received signal into an intermediate frequency signal using this local oscillator signal, and Carrier wave reproducing means for reproducing the received carrier wave signal, means for converting the intermediate frequency signal into a base band signal using the reproduced carrier wave signal, and carrier wave reproducing means for detecting a carrier wave component included in the base band signal And an automatic frequency control means for controlling the frequency of the regenerated carrier signal, wherein the regenerated carrier signal is used as a reference signal source of the local oscillating means.
【００１４】[0014]
【作用】局部発振器の周波数シンセサイザにおける基準
周波数に代えて再生搬送波を用い、これを分周してＶＣ
Ｏの分周出力と位相比較するようにすることで、受信信
号の周波数変動成分の吸収量が従来よりも大となる。The reproduced carrier wave is used in place of the reference frequency in the frequency synthesizer of the local oscillator, and this is divided into VCs.
By performing the phase comparison with the frequency-divided output of O, the absorption amount of the frequency fluctuation component of the received signal becomes larger than in the conventional case.
【００１５】[0015]
【実施例】以下に本発明の実施例について図面を用いて
説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１６】図１は本発明の実施例のブロック図であ
り、図２と同等部分は同一符号により示している。本例
では、局部発振器１の周波数シンセサイザ部の基準周波
数発振回路（図２の１０）に代えて、搬送波再生回路７
からの再生搬送周波数を用いている。この再生搬送周波
数を分周回路５により１／Ｋに分周して位相比較器の一
入力とするようになっている。FIG. 1 is a block diagram of an embodiment of the present invention, and the same parts as those in FIG. 2 are designated by the same reference numerals. In this example, instead of the reference frequency oscillation circuit (10 in FIG. 2) of the frequency synthesizer section of the local oscillator 1, the carrier recovery circuit 7 is used.
The reproduction carrier frequency from is used. This reproduction carrier frequency is divided into 1 / K by the frequency dividing circuit 5 and used as one input of the phase comparator.
【００１７】尚、搬送波は受信チャネル対応に変化する
ので、チャネル選択時に分周器５の分周比Ｋを設定制御
するようなっている。Since the carrier wave changes depending on the reception channel, the frequency division ratio K of the frequency divider 5 is set and controlled when the channel is selected.
【００１８】他の構成については図２のそれと同等であ
ってその説明は省略する。The other structure is the same as that of FIG. 2 and its explanation is omitted.
【００１９】かかる構成において、 ｆIF＝ｆL −ｆIN ……（７） ｆL ＝（Ｎ／Ｋ）ｆC ……（８） ｆBB＝ｆIF−ｆC ……（９） なる式が成立する。In such a configuration, the equation fIF = fL-fIN (7) fL = (N / K) fC (8) fBB = fIF-fC (9) holds.
【００２０】従って、（９）式は、 ｆBB＝｛（Ｎ−Ｋ）／Ｋ｝ｆC −ｆIN……（１０） となり、ｆBB＝０となるには、 ｛（Ｎ−Ｋ）／Ｋ｝ｆC −ｆIN＝０ ……（１１） となる必要があり、（１１）式において周波数の変動成
分Δｆのみを考えると、 ΔｆIN＝Δ｛（Ｎ−Ｋ）／Ｋ｝ｆC ……（１２） となる。Therefore, the equation (9) becomes fBB = {(N-K) / K} fC-fIN ... (10), and fBB = 0 becomes {(N-K) / K} fC-fIN. = 0 (11), and considering only the frequency fluctuation component Δf in the equation (11), ΔfIN = Δ {(N−K) / K} fC (12)
【００２１】すなわち、受信信号ｆINの変動成分ΔｆIN
は、再生搬送周波数ｆC の可変範囲ΔｆC の（Ｎ−Ｋ）
／Ｋ倍まで吸収できることになる。尚、分周器３，５の
分周比Ｎ，Ｋの関係は、Ｎ≫Ｋであることから、（Ｎ−
Ｋ）／Ｋ≫１となり、図２の例に比しより大きな変動量
の吸収が可能となることが判る。That is, the fluctuation component ΔfIN of the received signal fIN
Is (NK) of the variable range ΔfC of the reproduction carrier frequency fC.
/ K times can be absorbed. Since the frequency division ratios N and K of the frequency dividers 3 and 5 are N >> K, (N-
K) / K >> 1, and it can be understood that a larger variation amount can be absorbed as compared with the example of FIG.
【００２２】[0022]
【発明の効果】以上述べた如く、本発明によれば、周波
数シンセサイザ部の基準周波数発振回路を用いることな
く極めて簡単な構成で受信信号周波数の変動をより大き
く吸収できるという効果がある。As described above, according to the present invention, there is an effect that the fluctuation of the received signal frequency can be more greatly absorbed with an extremely simple structure without using the reference frequency oscillation circuit of the frequency synthesizer section.
【図１】本発明の実施例のブロック図である。FIG. 1 is a block diagram of an embodiment of the present invention.
【図２】従来の受信装置のブロック図である。FIG. 2 is a block diagram of a conventional receiving device.
１ 局部発振器 ２ ＶＣＯ ３，５ 分周器 ４ 位相比較器 ６ ループフィルタ ７ 搬送波再生回路 ８ ミキサ ９ 復調器 １２ ＡＦＣ制御回路 1 Local Oscillator 2 VCO 3, 5 Divider 4 Phase Comparator 6 Loop Filter 7 Carrier Recovery Circuit 8 Mixer 9 Demodulator 12 AFC Control Circuit
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０３Ｌ 7/18 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location H03L 7/18
Claims (3)
と、この局部発振信号を用いて受信信号を中間周波数信
号に変換する周波数変換手段と、この中間周波数信号か
ら受信搬送波信号を再生する搬送波再生手段と、この再
生搬送波信号を使用して前記中間周波数信号をベースバ
ンド信号に変換する手段と、このベースバンド信号に含
まれる搬送波成分を検出して前記搬送波再生手段の再生
搬送波信号の周波数を制御する自動周波数制御手段とを
含む受信装置であって、前記局部発振手段の基準信号源
として前記再生搬送波信号を用いることを特徴とする受
信装置。1. A local oscillating means of a frequency synthesizer system, a frequency converting means for converting a received signal into an intermediate frequency signal by using the local oscillating signal, and a carrier reproducing means for reproducing a received carrier signal from the intermediate frequency signal. Means for converting the intermediate frequency signal into a baseband signal using the reproduced carrier signal, and automatic means for controlling the frequency of the reproduced carrier signal of the carrier reproducing means by detecting a carrier component included in the baseband signal. A receiver including frequency control means, characterized in that the regenerated carrier signal is used as a reference signal source of the local oscillation means.
と、この発振周波数信号を分周する第１の分周器と、前
記再生搬送波信号を分周する第２の分周器と、前記第１
及び第２の分周器の出力の周波数位相比較をなす比較器
とを含み、この比較出力に応じて前記電圧制御発振器の
周波数制御をなすようにした周波数シンセサイザ回路で
あることを特徴とする請求項１記載の受信装置。2. The local oscillating means, a voltage controlled oscillator, a first frequency divider for dividing the oscillation frequency signal, a second frequency divider for dividing the reproduced carrier signal, and the second frequency divider. 1
And a comparator for performing frequency phase comparison of the outputs of the second frequency divider, and the frequency synthesizer circuit controls the frequency of the voltage controlled oscillator according to the comparison output. Item 1. The receiving device according to item 1.
分周器のそれより大に選定されていることを特徴とする
請求項２記載の受信装置。3. The receiving apparatus according to claim 2, wherein the frequency division ratio of the first frequency divider is selected to be larger than that of the second frequency divider.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6153388A JPH0818477A (en) | 1994-07-05 | 1994-07-05 | Receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6153388A JPH0818477A (en) | 1994-07-05 | 1994-07-05 | Receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0818477A true JPH0818477A (en) | 1996-01-19 |
Family
ID=15561399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6153388A Withdrawn JPH0818477A (en) | 1994-07-05 | 1994-07-05 | Receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0818477A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6233444B1 (en) | 1997-03-20 | 2001-05-15 | Matsushita Electric Industrial Co., Ltd. | Radio receiving method and radio receiving apparatus |
| JP2009038423A (en) * | 2007-07-31 | 2009-02-19 | Panasonic Corp | Oscillator, and receiving device and electronic device using the same |
-
1994
- 1994-07-05 JP JP6153388A patent/JPH0818477A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6233444B1 (en) | 1997-03-20 | 2001-05-15 | Matsushita Electric Industrial Co., Ltd. | Radio receiving method and radio receiving apparatus |
| JP2009038423A (en) * | 2007-07-31 | 2009-02-19 | Panasonic Corp | Oscillator, and receiving device and electronic device using the same |
| US8040178B2 (en) | 2007-07-31 | 2011-10-18 | Panasonic Corporation | Oscillator, and receiving device and electronic device using the oscillator |
| US8183915B2 (en) | 2007-07-31 | 2012-05-22 | Panasonic Corporation | Oscillator, and receiving device and electronic device using the oscillator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20011002 |