JPH02145829U - - Google Patents
Info
- Publication number
- JPH02145829U JPH02145829U JP5373389U JP5373389U JPH02145829U JP H02145829 U JPH02145829 U JP H02145829U JP 5373389 U JP5373389 U JP 5373389U JP 5373389 U JP5373389 U JP 5373389U JP H02145829 U JPH02145829 U JP H02145829U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- intermediate frequency
- mixing circuit
- oscillation
- input end
- 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
- 230000010355 oscillation Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
Landscapes
- Circuits Of Receivers In General (AREA)
Description
第１図はこの考案の第１の実施例の構成を示す
ブロツク図、第２図はこの考案の第２の実施例の
構成を示すブロツク図、第３図および第４図は各
々第２の実施例の動作を説明するための特性図、
第５図は従来の２方式モノラル受信機の構成を示
すブロツク、第６図は従来装置におけるノイズ発
生を説明するための特性図である。
１……主方式ＳＩＦフイルタ、２……副方式Ｓ
ＩＦフイルタ（以上１，２は第１、第２のフイル
タ）、３……混合回路、４……発振回路、５……
ＳＩＦフイルタ（第３のフイルタ）、６……検波
回路、８……入力端子、ＳＷ１，ＳＷ２……スイ
ツチ（スイツチ手段）、Ｃ……コンデンサ。
FIG. 1 is a block diagram showing the structure of the first embodiment of this invention, FIG. 2 is a block diagram showing the structure of the second embodiment of this invention, and FIGS. 3 and 4 respectively show the structure of the second embodiment of this invention. A characteristic diagram for explaining the operation of the embodiment,
FIG. 5 is a block diagram showing the configuration of a conventional two-system monaural receiver, and FIG. 6 is a characteristic diagram for explaining noise generation in the conventional device. 1...Main method SIF filter, 2...Sub method S
IF filter (1 and 2 above are first and second filters), 3...mixing circuit, 4...oscillation circuit, 5...
SIF filter (third filter), 6...detection circuit, 8...input terminal, SW1, SW2... switch (switch means), C... capacitor.
Claims (1)
、各方式に対応した異なる中心周波数が設定され
る第１、第２の中間周波フイルタと、前記混合回
路に発振出力を供給する発振回路と、前記混合回
路と検波回路との間に設けられ、いずれか一方の
前記中心周波数を中心周波数とする第３の中間周
波フイルタとを有する２方式モノラル受信機にお
いて、前記入力端と、前記第１、第２の中間周波
フイルタのうち高い中心周波数を有する中間周波
フイルタとの間にコンデンサを直列に介挿し、該
中間周波フイルタの入力端と接地点との間にスイ
ツチ手段を介挿したことを特徴とする２方式モノ
ラル受信機。 (2) 入力端と混合回路との間に並列に設けられ
、各方式に対応した異なる中心周波数が設定され
る第１、第２の中間周波フイルタと、前記混合回
路に発振出力を供給する発振回路と、前記混合回
路と検波回路との間に設けられた第３の中間周波
フイルタとを有する２方式モノラル受信機におい
て、前記各中心周波数のうち低い方を第３の中間
周波数フイルタの中心周波数とするとともに、前
記発振回路と前記混合回路との間に設けられるス
イツチ手段または前記発振回路の動作停止を制御
する動作停止手段を具備することを特徴とする２
方式モノラル受信機。[Claims for Utility Model Registration] (1) First and second intermediate frequency filters that are provided in parallel between the input end and the mixing circuit and have different center frequencies set corresponding to each method, and the mixing circuit. A two-system monaural receiver comprising an oscillation circuit that supplies an oscillation output to a circuit, and a third intermediate frequency filter that is provided between the mixing circuit and the detection circuit and whose center frequency is the center frequency of either one. A capacitor is inserted in series between the input end and an intermediate frequency filter having a higher center frequency among the first and second intermediate frequency filters, and the input end of the intermediate frequency filter is connected to a ground point. A two-system monaural receiver characterized in that a switch means is inserted between the two systems. (2) first and second intermediate frequency filters that are provided in parallel between the input end and the mixing circuit and have different center frequencies set corresponding to each method; and an oscillation device that supplies oscillation output to the mixing circuit. In a two-system monaural receiver having a circuit and a third intermediate frequency filter provided between the mixing circuit and the detection circuit, the lower one of the center frequencies is set as the center frequency of the third intermediate frequency filter. 2, further comprising a switch means provided between the oscillation circuit and the mixing circuit or an operation stop means for controlling the stop of the operation of the oscillation circuit.
System monaural receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5373389U JPH0625069Y2 (en) | 1989-05-10 | 1989-05-10 | 2 system monaural receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5373389U JPH0625069Y2 (en) | 1989-05-10 | 1989-05-10 | 2 system monaural receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02145829U true JPH02145829U (en) | 1990-12-11 |
| JPH0625069Y2 JPH0625069Y2 (en) | 1994-06-29 |
Family
ID=31575178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5373389U Expired - Lifetime JPH0625069Y2 (en) | 1989-05-10 | 1989-05-10 | 2 system monaural receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0625069Y2 (en) |
-
1989
- 1989-05-10 JP JP5373389U patent/JPH0625069Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0625069Y2 (en) | 1994-06-29 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |