JPH0420740U - - Google Patents
Info
- Publication number
- JPH0420740U JPH0420740U JP6227590U JP6227590U JPH0420740U JP H0420740 U JPH0420740 U JP H0420740U JP 6227590 U JP6227590 U JP 6227590U JP 6227590 U JP6227590 U JP 6227590U JP H0420740 U JPH0420740 U JP H0420740U
- Authority
- JP
- Japan
- Prior art keywords
- monaural
- circuit
- stereo
- adjacent channel
- channel interference
- 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
- 238000001514 detection method Methods 0.000 claims description 9
- 230000005236 sound signal Effects 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Stereo-Broadcasting Methods (AREA)
Description
第１図はこの考案に係るＦＭ受信機の強制モノ
ラル回路の実施例を示す構成ブロツク図である。
第２図及び第３図は従来例を示し、第２図は構成
ブロツク図、第３図はステレオ放送時とモノラル
放送時の選択度特性を示す特性図である。
主な符号の説明、１……ＩＦ信号入力端子、２
……ＦＭ検波回路、３……ステレオ復調回路、４
……Ｌチヤンネル音声信号端子、５……Ｒチヤン
ネル音声信号端子、６……ステレオ／モノラル切
換回路、７……隣接チヤンネル妨害検出回路。
FIG. 1 is a block diagram showing an embodiment of a forced monaural circuit for an FM receiver according to this invention.
2 and 3 show a conventional example, FIG. 2 is a block diagram of the configuration, and FIG. 3 is a characteristic diagram showing selectivity characteristics during stereo broadcasting and monaural broadcasting. Explanation of main symbols, 1...IF signal input terminal, 2
...FM detection circuit, 3...Stereo demodulation circuit, 4
...L channel audio signal terminal, 5...R channel audio signal terminal, 6...Stereo/monaural switching circuit, 7...Adjacent channel interference detection circuit.
Claims (1)
復調するＦＭ検波回路に接続され、復調された複
合音声信号をＬ及びＲチヤンネルのステレオ音声
信号に復調するステレオ復調回路をステレオ或は
モノラルに切換えるステレオ／モノラル切換回路
において、 前記ステレオ／モノラル切換回路に隣接チヤン
ネル妨害を受けたとき、バンドパスフイルタによ
つてＦＭ検波回路から出力するノイズ成分を検出
する隣接チヤンネル妨害検出回路を設け、隣接チ
ヤンネル妨害検出回路から検出した信号によつて
ステレオ／モノラル切換回路をモノラルに切換え
るように構成したことを特徴とするＦＭ受信機の
強制モノラル回路。 ２ 隣接チヤンネル妨害を受けたとき、ＦＭ検波
回路のＳ字カーブ特性より得られる隣接チヤンネ
ル妨害による直流成分を検出する隣接チヤンネル
妨害検出回路を設け、隣接チヤンネル妨害検出回
路から検出した信号によつて、ステレオ／モノラ
ル切換回路をモノラルに切換えるように構成した
ことを特徴とする請求項１記載のＦＭ受信機の強
制モノラル回路。[Claims for Utility Model Registration] 1. A stereo demodulation circuit that is connected to an FM detection circuit that demodulates an IF signal from an IF amplifier into a composite audio signal, and that demodulates the demodulated composite audio signal into stereo audio signals of L and R channels. In a stereo/monaural switching circuit that switches between stereo and monaural, when the stereo/monaural switching circuit receives interference from an adjacent channel, an adjacent channel interference detection unit detects a noise component output from the FM detection circuit using a bandpass filter. 1. A forced monaural circuit for an FM receiver, characterized in that the circuit is configured to switch a stereo/monaural switching circuit to monaural based on a signal detected from an adjacent channel interference detection circuit. 2. When receiving adjacent channel interference, an adjacent channel interference detection circuit is provided that detects the DC component due to adjacent channel interference obtained from the S-curve characteristic of the FM detection circuit, and the signal detected from the adjacent channel interference detection circuit is used to 2. The forced monaural circuit for an FM receiver according to claim 1, wherein the stereo/monaural switching circuit is configured to switch to monaural.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6227590U JPH0420740U (en) | 1990-06-14 | 1990-06-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6227590U JPH0420740U (en) | 1990-06-14 | 1990-06-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0420740U true JPH0420740U (en) | 1992-02-21 |
Family
ID=31591272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6227590U Pending JPH0420740U (en) | 1990-06-14 | 1990-06-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0420740U (en) |
-
1990
- 1990-06-14 JP JP6227590U patent/JPH0420740U/ja active Pending
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