JPH01135833U - - Google Patents
Info
- Publication number
- JPH01135833U JPH01135833U JP3162888U JP3162888U JPH01135833U JP H01135833 U JPH01135833 U JP H01135833U JP 3162888 U JP3162888 U JP 3162888U JP 3162888 U JP3162888 U JP 3162888U JP H01135833 U JPH01135833 U JP H01135833U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- local oscillation
- band
- integer
- 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.)
- Granted
Links
Landscapes
- Superheterodyne Receivers (AREA)
Description
第１図は本考案の原理図、第２図は本考案の第
１の実施例を表わす図、第３図は本考案の第２の
実施例を表わす図、第４図は本考案の第３の実施
例を表わす図、第５図は第３図および第４図のＡ
Ｍ／ＦＭチユーナの変形を表わす図。
図において、１１……局部発振回路、１２……
ＦＭ混合回路、１３……ＡＭ混合回路、２１……
分周器、２２……周波数帯域切換手段。
Fig. 1 is a diagram showing the principle of the present invention, Fig. 2 is a diagram showing the first embodiment of the invention, Fig. 3 is a diagram showing the second embodiment of the invention, and Fig. 4 is a diagram showing the principle of the invention. FIG. 5 is a diagram showing the embodiment of No. 3, and FIG. 5 is A of FIG. 3 and FIG.
A diagram showing a modification of the M/FM tuner. In the figure, 11... local oscillation circuit, 12...
FM mixing circuit, 13...AM mixing circuit, 21...
Frequency divider, 22...frequency band switching means.
Claims (1)
１１と、該局部発振回路１１の出力をＦＭ局部発
信信号としてＦＭ放送帯の受信信号と混合してＦ
Ｍ中間周波信号とするＦＭ混合回路１２と、ＡＭ
局部発信信号とＡＭ放送帯の受信信号とを混合し
てＡＭ中間周波信号とするＡＭ混合回路１３を具
備するＡＭ／ＦＭチユーナにおいて、 前記局部発振回路１１の出力を入力として整数
Ｋで分周した信号を出力する分周器２１を具備し
、該分周器の出力を前記ＡＭ局部発振信号とする
ことを特徴とするＡＭ／ＦＭチユーナ。 ２ 前記ＡＭ中間周波信号の周波数はすべての目
的国のＡＭ放送のチヤンネルセパレーシヨンの整
数倍であり、目的国における前記ＦＭ放送帯の帯
域が高い場合と低い場合とでは前記整数Ｋの値が
異なる請求項１記載のＡＭ／ＦＭチユーナ。 ３ 前記ＡＭ中間周波信号の周波数はすべての目
的国のＡＭ放送のチヤンネルセパレーシヨンの整
数倍であり、前記整数Ｋの値はすべての目的国に
ついての同一の値であり、目的国のＦＭ放送帯の
帯域が異なる時に前記ＡＭ中間周波信号の周波数
が同一になるように前記局部発振回路１１の出力
周波数の帯域をＡＭ放送受信の場合とＦＭ放送受
信の場合とで切換える周波数帯域切換手段２２を
具備する請求項１記載のＡＭ／ＦＭチユーナ。 ４ 前記整数Ｋの値は前記ＡＭ放送のチヤンネル
セパレーシヨンをＫＨｚ単位で表わした時の数値
または該数値に１以外の定数を乗じた整数値とし
、目的国のＦＭ放送帯の帯域が異なる時に前記Ａ
Ｍ中間周波信号の周波数が同一になるように前記
局部発振回路１１の出力周波数の帯域をＡＭ放送
受信の場合とＦＭ放送受信の場合とで切換える周
波数帯域切換手段２２を具備する請求項１記載の
ＡＭ／ＦＭチユーナ。[Claims for Utility Model Registration] 1. A local oscillation circuit 11 that outputs a signal of a specific frequency, and an FM local oscillation signal that mixes the output of the local oscillation circuit 11 with a received signal of an FM broadcast band to generate an FM broadcast band signal.
An FM mixing circuit 12 that produces an M intermediate frequency signal, and an AM
In an AM/FM tuner equipped with an AM mixing circuit 13 that mixes a local oscillation signal and a reception signal of an AM broadcast band to produce an AM intermediate frequency signal, the output of the local oscillation circuit 11 is input and the frequency is divided by an integer K. An AM/FM tuner comprising a frequency divider 21 for outputting a signal, the output of the frequency divider being the AM local oscillation signal. 2. The frequency of the AM intermediate frequency signal is an integer multiple of the channel separation of AM broadcasting in all destination countries, and the value of the integer K is different depending on whether the FM broadcast band in the destination country is high or low. The AM/FM tuner according to claim 1. 3. The frequency of said AM intermediate frequency signal is an integer multiple of the channel separation of AM broadcasting in all destination countries, the value of said integer K is the same value for all destination countries, and the frequency of said AM intermediate frequency signal is an integer multiple of the channel separation of AM broadcasting in all destination countries; A frequency band switching means 22 is provided for switching the output frequency band of the local oscillation circuit 11 between AM broadcast reception and FM broadcast reception so that the frequency of the AM intermediate frequency signal becomes the same when the bands of the AM intermediate frequency signal are different. The AM/FM tuner according to claim 1. 4. The value of the integer K shall be a numerical value representing the channel separation of the AM broadcast in KHz units, or an integer value obtained by multiplying the numerical value by a constant other than 1, and when the FM broadcasting band of the destination country is different, A
2. The apparatus according to claim 1, further comprising a frequency band switching means 22 for switching the output frequency band of the local oscillation circuit 11 between AM broadcast reception and FM broadcast reception so that the frequency of the M intermediate frequency signal becomes the same. AM/FM Chuyuna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988031628U JP2533710Y2 (en) | 1988-03-11 | 1988-03-11 | AM / FM tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988031628U JP2533710Y2 (en) | 1988-03-11 | 1988-03-11 | AM / FM tuner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01135833U true JPH01135833U (en) | 1989-09-18 |
| JP2533710Y2 JP2533710Y2 (en) | 1997-04-23 |
Family
ID=31257623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988031628U Expired - Lifetime JP2533710Y2 (en) | 1988-03-11 | 1988-03-11 | AM / FM tuner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2533710Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5680936A (en) * | 1979-12-04 | 1981-07-02 | Sanyo Electric Co Ltd | Multiband receiver |
-
1988
- 1988-03-11 JP JP1988031628U patent/JP2533710Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5680936A (en) * | 1979-12-04 | 1981-07-02 | Sanyo Electric Co Ltd | Multiband receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2533710Y2 (en) | 1997-04-23 |
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