JP3466474B2 - Receiving machine - Google Patents
Receiving machineInfo
- Publication number
- JP3466474B2 JP3466474B2 JP13130198A JP13130198A JP3466474B2 JP 3466474 B2 JP3466474 B2 JP 3466474B2 JP 13130198 A JP13130198 A JP 13130198A JP 13130198 A JP13130198 A JP 13130198A JP 3466474 B2 JP3466474 B2 JP 3466474B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- vco
- broadcast
- receiving
- oscillation
- 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 - Fee Related
Links
Landscapes
- Superheterodyne Receivers (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は受信機に関する。
【０００２】
【従来の技術】従来の受信機として、ＦＭ及びＡＭ放送
受信時に局部発振器を共用しミキサーの出力として同一
中間周波数に変換するタイプの受信機がある。このよう
なタイプの受信機では、ＦＭ及びＡＭ放送を受信する場
合、ミキサー回路を通して同一の中間周波（ＩＦ）信号
（例えば、ＦＭ受信用ＩＦ＝１０．７ＭＨｚ）に変換す
るのであるが、その際ＶＣＯ発振器（局部発振器）の発
振周波数は以下の式で求められる。
１．ＦＭ放送受信時
ＶＣＯ周波数＝受信周波数＋１０．７ＭＨｚ
２．ＡＭ（ＭＷ）放送受信時
ＶＣＯ周波数＝（受信周波数＋１０．７ＭＨｚ）×１０
ただし、ＡＭ放送受信時にはＶＣＯ周波数はミキサー入
力前に１／１０分周される。
【０００３】また、ワイドバンド（例えば、東欧向け）
のＦＭ／ＡＭ受信機の場合、受信周波数とＶＣＯ発振周
波数範囲は次の通りである。
１．ＦＭ放送受信時
受信周波数・・・・・・６５．０〜７４．０ＭＨｚ，８
７．５〜１０８ＭＨｚ
ＶＣＯ周波数範囲・・・７５．７〜８４．７ＭＨｚ，９
８．２〜１１８．７ＭＨｚ
２．ＡＭ放送受信時
受信周波数・・・・・・（ＬＷ）１５３〜２８１ｋＨ
ｚ，（ＭＷ）５３１〜１６１１ｋＨｚ
ＶＣＯ周波数範囲・・・（ＬＷ）１０８．５３〜１０
９．８１ＭＨｚ，（ＭＷ）１１２．３１〜１２３．１１
ＭＨｚ
【０００４】
【発明が解決しようとする課題】しかし、上記従来の受
信機では、ＦＭ及びＡＭ放送受信時にＶＣＯコイルを共
用としかつミキサーは共に減算器として使用しており、
ＶＣＯ発振周波数範囲が７５．７〜１２３．１１ＭＨｚ
まで広がってしまい、その結果、受信機のＳ／Ｎ比が悪
化しやすくなると共に、トラッキング設計上問題になる
という不具合があった。
【０００５】本発明の目的は、上記従来の不具合を改善
した受信機を提供することにある。
【０００６】
【課題を解決するための手段】本発明による受信機は、
請求項１に記載のように、ＡＭ放送及びＦＭ放送を受信
し同一の中間周波数に変換する受信機であって、局部発
振器としてのＶＣＯ発振器と、前記ＶＣＯ発振器の発振
信号を分周する分周器と、受信信号と前記ＶＣＯ発振器
の発振信号又は前記分周器により分周された発振信号と
を供給され、ＡＭ放送受信時には前記受信信号の周波数
と前記分周器による分周後の信号の周波数とを加算する
加算器として動作し、ＦＭ放送受信時には前記ＶＣＯ発
振器の発振信号の周波数と前記受信信号の周波数との差
を計算する減算器として動作することで、前記受信信号
と前記発振信号とを混合するミキサーと、前記ＶＣＯ発
振器と前記ミキサーとの間に設けられ、ＦＭ放送受信時
にオンしＡＭ放送受信時にオフするスイッチと、前記分
周器と前記ミキサーとの間に設けられ、ＡＭ放送受信時
にオンしＦＭ放送受信時にオフするスイッチと、ＡＭ放
送の受信周波数に対応する前記ＶＣＯ発振器の発振周波
数の最大値から最小値まで範囲が、ＦＭ放送の受信周波
数に対応する前記ＶＣＯ発振器の発振周波数の最大値か
ら最小値まで範囲に内包されるように、ＡＭ放送受信時
及びＦＭ放送受信時の前記ＶＣＯ発振器の発振周波数を
決定する制御回路と、を備えることを特徴とする。
【０００７】
【０００８】
【０００９】
【００１０】
【発明の実施の形態】図１は本発明による受信機の一実
施例を示すブロック図である。図において、１はアンテ
ナ、２はＲＦアンプ、３はミキサー、４はＶＣＯ発振
器、５は１／１０分周器、６及び７はスイッチ、８はＶ
ＣＯ発振器４の周波数を決定するＰＬＬ回路８ａ及び制
御回路（例えばマイクロコンピュータ）８ｂからなる選
局部である。
【００１１】ＶＣＯ発振器４のＶＣＯ発振周波数は、制
御回路８ｂによって以下のように設定される。
１．ＦＭ放送受信時
ＶＣＯ周波数＝受信周波数＋１０．７ＭＨｚ
２．ＡＭ（ＭＷ）放送受信時
ＶＣＯ周波数＝（１０．７ＭＨｚー受信周波数）×１０
【００１２】上記の構成において、ＦＭ放送受信時は、
スイッチ６がオン、スイッチ７がオフとなるように切り
換えられ、アンテナ１で受信した受信信号周波数（ｆr
）は、ＶＣＯ発振器４のＶＣＯ発振周波数（ｆVCO ）
信号が入力されたミキサー３で減算され、ＩＦ（例え
ば、１０．７ＭＨｚ）信号が出力される。一方、ＡＭ放
送受信時は、スイッチ６がオフ、スイッチ７がオンとな
るように切り換えられ、アンテナ１で受信した受信信号
周波数（ｆr ）は、ＶＣＯ発振器４のＶＣＯ発振周波数
（ｆVCO ）信号を１／１０分周器５で１／１０分周した
周波数（ｆVCO ／１０）信号が入力されたミキサー３で
加算され、ＦＭ放送受信時と同一のＩＦ（１０．７ＭＨ
ｚ）信号が出力される。
【００１３】ワイドバンド（例えば、東欧向け）のＦＭ
／ＡＭ受信機の場合は、受信周波数とＶＣＯ発振周波数
範囲は次の通りとなる。
１．ＦＭ放送受信時
受信周波数・・・・・・６５．０〜７４．０ＭＨｚ，８
７．５〜１０８ＭＨｚ
ＶＣＯ周波数範囲・・・７５．７〜８４．７ＭＨｚ，９
８．２〜１１８．７ＭＨｚ
２．ＡＭ放送受信時
受信周波数・・・・・・１５３〜２８１ｋＨｚ，５３１
〜１６１１ｋＨｚ
ＶＣＯ周波数範囲・・・１０５．４７〜１０４．１９Ｍ
Ｈｚ，１０１．６９〜９０．８９ＭＨｚ
【００１４】上述のように、ミキサー３をＦＭ放送受信
時は減算器として使用し、ＡＭ放送受信時は加算器とし
て使用することにより、ＡＭ放送受信時のＶＣＯ発振周
波数範囲は、９０．８９〜１０１．６９ＭＨｚ，１０
４．１９〜１０５．４７ＭＨｚとなり、ＦＭ放送受信時
のＶＣＯ発振周波数範囲７５．７〜１１８．７ＭＨｚの
中にカバーされるようになり、従来の受信機よりＶＣＯ
発振周波数範囲を狭くすることができる。
【００１５】したがって、受信機のＳ／Ｎ比の悪化を防
ぐと共に、トラッキング設計の容易化が図れる。また、
発振用コイルの共用化も図れる。
【００１６】実施の形態では、ＦＭとＡＭで説明した
が、複数の異なる受信周波数帯域放送受信の時も同じで
ある。また、スイッチ６及び７は、１個のスイッチでミ
キサーへの入力をＶＣＯ発振器出力と１／１０分周器出
力とで切り換えるように構成しても良い。
【００１７】
【発明の効果】本発明によれば、従来の受信機よりＶＣ
Ｏ発振器の発振周波数範囲を狭くすることができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver. 2. Description of the Related Art As a conventional receiver, there is a receiver of a type which shares a local oscillator when receiving FM and AM broadcasts and converts the same to the same intermediate frequency as an output of a mixer. In this type of receiver, when FM and AM broadcasts are received, they are converted to the same intermediate frequency (IF) signal (for example, IF reception IF = 10.7 MHz) through a mixer circuit. The oscillation frequency of the VCO oscillator (local oscillator) is obtained by the following equation. 1. 1. VCO frequency at the time of FM broadcast reception = reception frequency + 10.7 MHz VCO frequency at reception of AM (MW) broadcast = (reception frequency + 10.7 MHz) × 10 However, at the time of AM broadcast reception, the VCO frequency is divided by 1/10 before input to the mixer. [0003] Also, wideband (for example, for Eastern Europe)
In the case of the FM / AM receiver, the reception frequency and the VCO oscillation frequency range are as follows. 1. FM broadcast reception frequency: 65.0-74.0 MHz, 8
7.5 to 108 MHz VCO frequency range: 75.7 to 84.7 MHz, 9
8.2 to 118.7 MHz 2. AM broadcast reception frequency (LW) 153-281 kHz
z, (MW) 531 to 1611 kHz VCO frequency range (LW) 108.53 to 10
9.81 MHz, (MW) 112.31 to 123.11
However, in the above-mentioned conventional receiver, the VCO coil is shared when the FM and AM broadcasts are received, and the mixer is both used as a subtractor.
VCO oscillation frequency range 75.7 to 123.11 MHz
As a result, there is a problem that the S / N ratio of the receiver is easily deteriorated, and a problem occurs in tracking design. It is an object of the present invention to provide a receiver in which the above-mentioned conventional disadvantages are improved. [0006] A receiver according to the present invention comprises:
As described in claim 1, AM broadcast and FM broadcast are received.
Receiver that converts to the same intermediate frequency.
VCO oscillator as vibrator and oscillation of said VCO oscillator
Frequency divider for dividing a signal, received signal and VCO oscillator
And the oscillation signal divided by the frequency divider or
At the time of AM broadcast reception, the frequency of the received signal
And the frequency of the signal after frequency division by the frequency divider
Operates as an adder and generates VCO when receiving FM broadcast.
Difference between the frequency of the oscillation signal of the vibrator and the frequency of the received signal
By operating as a subtractor that calculates
A mixer for mixing the VCO and the oscillation signal;
Provided between the shaker and the mixer, when receiving FM broadcast
And a switch that turns on when the AM broadcast is received.
Provided between the frequency divider and the mixer, when receiving AM broadcast
Switch that turns on and off when FM broadcasts are received
The oscillation frequency of the VCO oscillator corresponding to the reception frequency of transmission
The range from the maximum value to the minimum value is the FM broadcast reception frequency.
The maximum value of the oscillation frequency of the VCO oscillator corresponding to the number
AM broadcast reception so that it is included in the range from
And the oscillation frequency of the VCO oscillator at the time of FM broadcast reception
And a control circuit for determining . FIG. 1 is a block diagram showing an embodiment of a receiver according to the present invention. In the figure, 1 is an antenna, 2 is an RF amplifier, 3 is a mixer, 4 is a VCO oscillator, 5 is a 1/10 frequency divider, 6 and 7 are switches, 8 is V
This is a tuning unit including a PLL circuit 8a for determining the frequency of the CO oscillator 4 and a control circuit (for example, a microcomputer) 8b. The VCO oscillation frequency of the VCO oscillator 4 is set by the control circuit 8b as follows. 1. 1. VCO frequency at the time of FM broadcast reception = reception frequency + 10.7 MHz VCO frequency at the time of AM (MW) broadcast reception = (10.7 MHz−reception frequency) × 10 In the above configuration, at the time of FM broadcast reception,
The switch 6 is turned on and the switch 7 is turned off, and the received signal frequency (fr
) Is the VCO oscillation frequency (fVCO) of the VCO oscillator 4
The signal is subtracted by the input mixer 3, and an IF (for example, 10.7 MHz) signal is output. On the other hand, at the time of AM broadcast reception, the switch 6 is turned off and the switch 7 is turned on. The frequency (fVCO / 10) signal obtained by dividing the frequency by 1/10 with the / 10 frequency divider 5 is added by the input mixer 3, and the same IF (10.7 MH) as when FM broadcast is received
z) A signal is output. Wideband FM (for example, for Eastern Europe)
In the case of the / AM receiver, the reception frequency and the VCO oscillation frequency range are as follows. 1. FM broadcast reception frequency: 65.0-74.0 MHz, 8
7.5 to 108 MHz VCO frequency range: 75.7 to 84.7 MHz, 9
8.2 to 118.7 MHz 2. AM broadcast reception frequency 153 to 281 kHz, 531
１６1611 kHz VCO frequency range: 105.47 to 104.19M
Hz, 101.69 to 90.89 MHz As described above, the mixer 3 is used as a subtractor when receiving FM broadcasts and as an adder when receiving AM broadcasts, so that the VCO when receiving AM broadcasts is used. The oscillation frequency range is 90.89 to 101.69 MHz, 10
4.19 to 105.47 MHz, which covers the VCO oscillation frequency range of 75.7 to 118.7 MHz when receiving FM broadcasting.
The oscillation frequency range can be narrowed. Therefore, it is possible to prevent deterioration of the S / N ratio of the receiver and to facilitate tracking design. Also,
The oscillation coil can be shared. Although the embodiment has been described with reference to FM and AM, the same applies to reception of a plurality of different reception frequency band broadcasts. Further, the switches 6 and 7 may be configured such that the input to the mixer is switched between the output of the VCO oscillator and the output of the 1/10 frequency divider with one switch. According to the present invention, according to the present invention, the VC
Oscillation frequency range of the O oscillator can be narrowed.
【図面の簡単な説明】
【図１】本発明による受信機の一実施例を示すブロック
図である。
【符号の説明】
１ アンテナ
２ ＲＦアンプ
３ ミキサー
４ ＶＣＯ発振器
５ １／１０分周器
６ スイッチ
７ スイッチ
８ 選局部
８ａ ＰＬＬ回路
８ｂ 制御回路BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of a receiver according to the present invention. [Description of Signs] 1 Antenna 2 RF amplifier 3 Mixer 4 VCO oscillator 5 1/10 frequency divider 6 Switch 7 Switch 8 Tuning section 8a PLL circuit 8b Control circuit
Claims (1)
間周波数に変換する受信機であって、 局部発振器としてのＶＣＯ発振器と、 前記ＶＣＯ発振器の発振信号を分周する分周器と、 受信信号と前記ＶＣＯ発振器の発振信号又は前記分周器
により分周された発振信号とを供給され、ＡＭ放送受信
時には前記受信信号の周波数と前記分周器による分周後
の信号の周波数とを加算する加算器として動作し、ＦＭ
放送受信時には前記ＶＣＯ発振器の発振信号の周波数と
前記受信信号の周波数との差を計算する減算器として動
作することで、前記受信信号と前記発振信号とを混合す
るミキサーと、 前記ＶＣＯ発振器と前記ミキサーとの間に設けられ、Ｆ
Ｍ放送受信時にオンしＡＭ放送受信時にオフするスイッ
チと、 前記分周器と前記ミキサーとの間に設けられ、ＡＭ放送
受信時にオンしＦＭ放送受信時にオフするスイッチと、 ＡＭ放送の受信周波数に対応する前記ＶＣＯ発振器の発
振周波数の最大値から最小値まで範囲が、ＦＭ放送の受
信周波数に対応する前記ＶＣＯ発振器の発振周波数の最
大値から最小値まで範囲に内包されるように、ＡＭ放送
受信時及びＦＭ放送受信時の前記ＶＣＯ発振器の発振周
波数を決定する制御回路と、 を備えることを 特徴とする受信機。(57) [Claims] [Claim 1] AM broadcast and FM broadcast are received and the same
A receiver for converting between frequency and the VCO oscillator as a local oscillator, a frequency divider for dividing the oscillation signal of the VCO oscillator, the oscillation signal of the received signal and the VCO oscillator or the frequency divider
Is supplied with the oscillation signal divided by
Sometimes after the frequency of the received signal and frequency division by the frequency divider
Operates as an adder for adding the frequency of the
When receiving a broadcast, the frequency of the oscillation signal of the VCO
Acts as a subtractor for calculating the difference from the frequency of the received signal
By mixing, the reception signal and the oscillation signal are mixed.
And a mixer provided between the VCO oscillator and the mixer.
Switch to turn on when receiving M broadcast and turn off when receiving AM broadcast
And an AM broadcast provided between the frequency divider and the mixer.
A switch that is turned on when receiving and turned off when receiving FM broadcasting, and a switch that generates the VCO oscillator corresponding to the receiving frequency of AM broadcasting.
The range from the maximum value to the minimum value of the
Of the oscillation frequency of the VCO oscillator corresponding to the communication frequency.
AM broadcasting so that it is included in the range from the maximum value to the minimum value
Oscillation frequency of the VCO oscillator during reception and FM broadcast reception
Receiver, characterized in that it comprises a control circuit for determining the wavenumber, a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13130198A JP3466474B2 (en) | 1998-04-24 | 1998-04-24 | Receiving machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13130198A JP3466474B2 (en) | 1998-04-24 | 1998-04-24 | Receiving machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11312997A JPH11312997A (en) | 1999-11-09 |
| JP3466474B2 true JP3466474B2 (en) | 2003-11-10 |
Family
ID=15054769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13130198A Expired - Fee Related JP3466474B2 (en) | 1998-04-24 | 1998-04-24 | Receiving machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3466474B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020137469A1 (en) * | 2000-07-24 | 2002-09-26 | Manabu Yamaguchi | Radio communication apparatus and radio communication method |
-
1998
- 1998-04-24 JP JP13130198A patent/JP3466474B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11312997A (en) | 1999-11-09 |
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