JPS58129851A - Fm receiver - Google Patents
Fm receiverInfo
- Publication number
- JPS58129851A JPS58129851A JP1087982A JP1087982A JPS58129851A JP S58129851 A JPS58129851 A JP S58129851A JP 1087982 A JP1087982 A JP 1087982A JP 1087982 A JP1087982 A JP 1087982A JP S58129851 A JPS58129851 A JP S58129851A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- stereo
- received
- demodulating
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
- H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
- H04H40/36—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving
- H04H40/45—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving
- H04H40/72—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving for noise suppression
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1646—Circuits adapted for the reception of stereophonic signals
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Stereo-Broadcasting Methods (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、受信したステレオ放送電波をステレオ復調し
てステレオ再生するFM受信機に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an FM receiver that demodulates received stereo broadcast waves and reproduces them in stereo.
第1図は、従来の一般的なFM受信機の部分的な構成を
示すもので、1は中間周波増幅回路、2はFM復調回路
、3はマルチプレックス・ステレオ回路である。FIG. 1 shows a partial configuration of a conventional general FM receiver, in which 1 is an intermediate frequency amplification circuit, 2 is an FM demodulation circuit, and 3 is a multiplex stereo circuit.
このように構成された従来例では、所望のステレオ放送
電波を受信すると、中間周波増幅回路lで一旦増幅され
た受信信号は、FM復調回路2で復調された後、マルチ
プレックス・ステレオ回路3で左信号と右信号とに分離
され、再生品位が高いものを得られる。ところが、所望
の局のステレオ放送電波と共に、他局の放送電波、他の
無線電波或いはこれ等の電波の高調波、低調波等の、所
謂、妨害電波を受信し、しかも、FM復調回路2で受信
信号と共に妨害信号も復調されて、例えば、第2図に示
す如く、復調された受信信号のステレオ用副チャンネル
信号Aに復調された妨害信号Bが重畳されると、マルチ
プレックス・ステレオ回路3においても、妨害信号が乗
った受信信号を左イ1号及び右信号に分離するので、再
生品位が低下する欠点があり、特に、FMラジオ局が増
加してくるにつれてこの欠点は多発し、又、他局の出力
周波数差が150kH2以内になれば、この欠点は必ず
発生する。In the conventional example configured in this way, when a desired stereo broadcast radio wave is received, the received signal is once amplified by the intermediate frequency amplification circuit l, demodulated by the FM demodulation circuit 2, and then demodulated by the multiplex stereo circuit 3. The signal is separated into a left signal and a right signal, resulting in high reproduction quality. However, along with the stereo broadcast radio waves of the desired station, so-called interference radio waves such as broadcast radio waves of other stations, other radio radio waves, or harmonics and subharmonics of these radio waves are received, and moreover, the FM demodulation circuit 2 receives The interference signal is demodulated together with the received signal, and for example, as shown in FIG. 2, when the demodulated interference signal B is superimposed on the stereo sub-channel signal A of the demodulated received signal, the multiplex stereo circuit 3 Also, since the received signal containing the interference signal is separated into the left signal No. 1 and the right signal, there is a drawback that the playback quality deteriorates.In particular, as the number of FM radio stations increases, this drawback becomes more frequent. If the output frequency difference between other stations is within 150kHz, this drawback will definitely occur.
本発明は、前記従来例の欠点を解消するために、FM復
調回路の後段に妨害信号排除手段を挿入したFM受信機
を提供するものである。以下、本発明の実施例を詳細に
説明する。In order to eliminate the drawbacks of the conventional example, the present invention provides an FM receiver in which interfering signal eliminating means is inserted after the FM demodulation circuit. Examples of the present invention will be described in detail below.
第3図は、本発明の一実施例の構成を示すもので、第1
図の符号と同一符号のものは同一部分を示しており、又
、4はFM復調回路2とマルチブレ7クス・ステレオ回
路3との間に挿入したアンチバーブフィルタで、このア
ンチバーブフィルタ4は、第4図に示す如く、ステレオ
用主チヤンネル信号C及びステレオ用副チャンネル信号
Aを通過させる振幅特性を有するが、又、ステレオ用主
チヤンネル信号Cの領域では遅延時間は小さく、且つ、
はぼ一定であるが、ステレオ用副チャンネル信号Aの領
域では遅延時間が犬きく変化する相遅延特性を有するだ
め、ステレオ復調用のパイロット信号とステレオ用副チ
ャンネル信号Aとの位相に差が生じて、左信号と右信号
との分離特性は劣化するが、妨害信号を減少させること
ができる。FIG. 3 shows the configuration of one embodiment of the present invention.
The same reference numerals as those in the figure indicate the same parts, and 4 is an antiverb filter inserted between the FM demodulation circuit 2 and the multi-branch stereo circuit 3, and this antiverb filter 4 is as follows: As shown in FIG. 4, it has an amplitude characteristic that allows the stereo main channel signal C and the stereo sub-channel signal A to pass, but the delay time is small in the region of the stereo main channel signal C, and
However, in the region of the stereo sub-channel signal A, the delay time has a phase delay characteristic that changes sharply, so a difference occurs in the phase between the pilot signal for stereo demodulation and the stereo sub-channel signal A. Although the separation characteristics between the left signal and the right signal deteriorate, the interference signal can be reduced.
5はステレオ用副チャンネル信号のS/N比の低下を防
止するハイブレンド回路、6は、FM復調回路2から出
力された信号に妨害信号が入っているか否かを検出する
妨害信号検出回路、7は、妨害信号検出回路6が妨害信
号を検出したときには、FM復調回路2から出力された
信号が、アンチノく一テフィルタ4、マルチプレックス
・ステレオ回路3及びハイブレンド回路5を順次通過す
るように回路接続を切り換え、又、妨害信号検出回路6
が妨害信号を検出しないときには、FM復調回路2から
出力された信号が、マルチプレツク・ステレオ回路3の
みを通過するように回路接続を切り換える回路接続制御
回路である。5 is a high blend circuit that prevents a decrease in the S/N ratio of the stereo sub-channel signal; 6 is an interference signal detection circuit that detects whether or not an interference signal is included in the signal output from the FM demodulation circuit 2; 7 is configured such that when the interference signal detection circuit 6 detects an interference signal, the signal output from the FM demodulation circuit 2 passes through the anti-noise filter 4, the multiplex stereo circuit 3, and the high blend circuit 5 in sequence. Switch the circuit connection and also install the interference signal detection circuit 6
The circuit connection control circuit switches the circuit connection so that the signal output from the FM demodulation circuit 2 passes only through the multiplex stereo circuit 3 when the FM demodulation circuit 2 does not detect an interfering signal.
このように構成された本実施例では、FM復調回路2か
ら受信信号と共に妨害信号が出力されると、妨害信号検
知回路6及び回路接続制御回路7が切角して、アンチバ
ーブフィルタ4、マルチフレックス・ステレオ回路3及
びハイブレンド回路5を通過した、左信号と右信号との
分離度が低下してはいるものの、妨害信号を減少させた
、聴感上、再生品位の比較的高い左信号及び右信号が得
らね、又、FM復調回路2から受信信号のみが出力され
ると、妨害信号検知回路6及び回路接続制御回路7が動
作して、マルチプレックス・ステレオ回路3を通過した
、再生品位の高い左信号及び右信号が得られる。In this embodiment configured as described above, when the FM demodulation circuit 2 outputs the interference signal together with the received signal, the interference signal detection circuit 6 and the circuit connection control circuit 7 switch to the antiverb filter 4 and the multi-channel Although the degree of separation between the left signal and the right signal is reduced after passing through the flex stereo circuit 3 and the high blend circuit 5, the left signal and the left signal have a comparatively high playback quality in terms of audibility and have reduced interfering signals. If the right signal cannot be obtained and only the received signal is output from the FM demodulation circuit 2, the interference signal detection circuit 6 and the circuit connection control circuit 7 operate, and the reproduction signal that has passed through the multiplex stereo circuit 3 is activated. High quality left and right signals can be obtained.
以上説明したように、本発明によれば、多数のFM放送
局或いは無線局が存在してbる地域では、所望の局のF
M放送電波と共に妨害電波を受信しても、聴感上、品位
の比較的高いステレオ再生が行なえると共に、所望の局
のFM放送電波のみを受信したときには、高品位のステ
レオ再生が行なえる利点がある。As explained above, according to the present invention, in an area where there are a large number of FM broadcast stations or radio stations, the FM of a desired station can be
Even if interference radio waves are received along with the FM broadcast radio waves, relatively high-quality stereo playback can be performed in terms of audibility, and when only the FM broadcast radio waves of the desired station are received, high-quality stereo playback can be performed. be.
第1図は従来のFM受信機のブロック図、第2図はFM
復調回路の出力波形図、第3図は本発明の一実施例のブ
ロック図、第4図は本発明の一実施例のアンチバーブフ
ィルタの振幅特性及び相遅延特性である。
1 ・・・・・・・・・中間周波増幅回路、 2・・・
・・・・・・FM復調回路、 3・・・・・・・・・マ
ルチプレックス・ステレオ回路、 4・・・・・・・・
・アンチバーブフィルタ、5・・・・・・・・・ハイブ
レンド回路、 6・・・・・・・・妨害信号検出回路、
7・・・・・・・・・回路接続制御回路。
特許出願人 松下電器産業株式会社
代理人 星 野恒司Figure 1 is a block diagram of a conventional FM receiver, Figure 2 is a block diagram of a conventional FM receiver.
FIG. 3 is a block diagram of an embodiment of the present invention, and FIG. 4 is an amplitude characteristic and phase delay characteristic of an antiverb filter according to an embodiment of the present invention. 1...Intermediate frequency amplification circuit, 2...
...FM demodulation circuit, 3...Multiplex stereo circuit, 4...
・Antiverb filter, 5... High blend circuit, 6... Interfering signal detection circuit,
7......Circuit connection control circuit. Patent applicant: Matsushita Electric Industrial Co., Ltd. Agent: Koji Hoshino
Claims (2)
てステレオ再生するFM受信機において、FM復調手段
によって復調した受信信号を妨害する範囲に妨害信号が
あるのを妨害信号検出手段が検出すると、前記FM復調
手段の出力端に接続した妨害信号排除手段が動作して、
前記妨害信号が減少した前記受信信号を出力し、又、妨
害信号がないのを前記妨害信号検出手段が検出すると、
前記妨害信号排除手段が動作を停止して、前記受信信号
をそのまま出力することを特徴とするFM受信機。(1) In an FM receiver that demodulates received stereo broadcast radio waves and reproduces them in stereo, when the interfering signal detecting means detects that there is an interfering signal within a range that interferes with the received signal demodulated by the FM demodulating means, the FM The interference signal eliminating means connected to the output end of the demodulating means operates,
outputting the received signal in which the interfering signal is reduced, and when the interfering signal detection means detects that there is no interfering signal;
An FM receiver characterized in that the interference signal eliminating means stops operating and outputs the received signal as it is.
トマルチプレノクス・ステレオ手段との間に接続したア
ンチバーブフィルタと、前記マルチプレックス・ステレ
オ手段の出力端に接続したハイブレンド回路とから成る
ことを特徴とする特許請求の範囲第(])項記載のFM
受信機。(2) The interfering signal eliminating means comprises an antiverb filter connected between the FM demodulating means and the multiplex stereo means, and a high blend circuit connected to the output end of the multiplex stereo means. The FM according to claim No. ( ]) characterized by
Receiving machine.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1087982A JPS58129851A (en) | 1982-01-28 | 1982-01-28 | Fm receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1087982A JPS58129851A (en) | 1982-01-28 | 1982-01-28 | Fm receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58129851A true JPS58129851A (en) | 1983-08-03 |
Family
ID=11762606
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1087982A Pending JPS58129851A (en) | 1982-01-28 | 1982-01-28 | Fm receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58129851A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5222252A (en) * | 1990-08-30 | 1993-06-22 | Robert Bosch Gmbh | Stereo radio receiver multipath disturbance detection circuit |
-
1982
- 1982-01-28 JP JP1087982A patent/JPS58129851A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5222252A (en) * | 1990-08-30 | 1993-06-22 | Robert Bosch Gmbh | Stereo radio receiver multipath disturbance detection circuit |
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