JPS6349011Y2 - - Google Patents

Info

Publication number
JPS6349011Y2
JPS6349011Y2 JP1982050177U JP5017782U JPS6349011Y2 JP S6349011 Y2 JPS6349011 Y2 JP S6349011Y2 JP 1982050177 U JP1982050177 U JP 1982050177U JP 5017782 U JP5017782 U JP 5017782U JP S6349011 Y2 JPS6349011 Y2 JP S6349011Y2
Authority
JP
Japan
Prior art keywords
audio signal
sub
channel audio
audio
signal
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
Application number
JP1982050177U
Other languages
Japanese (ja)
Other versions
JPS58152061U (en
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP5017782U priority Critical patent/JPS58152061U/en
Priority to GB08308771A priority patent/GB2122458B/en
Priority to DE19833311947 priority patent/DE3311947C2/en
Priority to NL8301227A priority patent/NL192284C/en
Priority to FR8305679A priority patent/FR2525059B1/en
Publication of JPS58152061U publication Critical patent/JPS58152061U/en
Application granted granted Critical
Publication of JPS6349011Y2 publication Critical patent/JPS6349011Y2/ja
Granted legal-status Critical Current

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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
    • H04N5/607—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals for more than one sound signal, e.g. stereo, multilanguages

Description

【考案の詳細な説明】[Detailed explanation of the idea]

本考案は、夫々の音声信号により変調された音
声多重の主、副チヤンネル音声信号搬送波を受信
し、副チヤンネル音声信号搬送波にのるパイロツ
ト信号搬送波にもとづき音声多重内容を識別回路
部で識別して、この識別により主、副チヤンネル
音声信号のいずれかあるいは両者を可聴音声とし
て出力する受信機に関するものである。 現在各国においては、テレビジヨン放送におい
ての音声多重がすすめられている。例えば、西独
国におけるテレビジヨン放送での音声多重システ
ムは、次のようになつている。 第１図に示されるように、映像信号搬送波Ｐの
周波数より5.5MHzだけ高い周波数の従来から使
用されている音声信号搬送波を主チヤンネル音声
信号搬送波S1として、更に音声多重のために映像
信号搬送波Ｐの周波数より5.742MHzだけ高い副
チヤンネル音声信号搬送波S2を付加して、これら
２波によつて構成される。そして、これら主、副
チヤンネル音声信号搬送波S1，S2夫々には、ステ
レオ放送、２ケ国語放送およびモノラル放送に対
応して別表のような内容で音声（言語）がFM変
調によつてのせられる。また、主、副チヤンネル
音声信号搬送波S1，S2にのる音声（言語）が、ス
テレオ放送、２ケ国語放送あるいはモノラル放送
の内容であるかを識別するために、副チヤンネル
音声搬送波S2に低周波で構成される識別信号（ス
テレオ放送；117Hz、２ケ国語放送；274PH、モノ
ラル放送：０Hz）によりAM変調されたパイロツ
ト信号搬送波（54.6875kHz）がFM変調によつて
のせられる。 The present invention receives main and sub-channel audio signal carrier waves modulated by respective audio signals, and identifies the content of the audio multiplex using an identification circuit based on a pilot signal carrier wave carried on the sub-channel audio signal carrier wave. This invention relates to a receiver that outputs either or both of the main and sub-channel audio signals as audible audio based on this identification. Currently, audio multiplexing in television broadcasting is being promoted in many countries. For example, the audio multiplexing system for television broadcasting in West Germany is as follows. As shown in Figure 1, the conventionally used audio signal carrier with a frequency 5.5 MHz higher than the frequency of the video signal carrier P is used as the main channel audio signal carrier S 1 , and the video signal carrier is further used for audio multiplexing. A sub-channel audio signal carrier S 2 having a frequency higher than that of P by 5.742 MHz is added, and is composed of these two waves. Then, on each of these main and sub channel audio signal carrier waves S 1 and S 2 , audio (language) is loaded by FM modulation according to the contents shown in the attached table, corresponding to stereo broadcasting, bilingual broadcasting, and monaural broadcasting. It will be done. In addition, in order to identify whether the audio (language) carried on the main and sub channel audio signal carrier waves S 1 and S 2 is the content of stereo broadcasting, bilingual broadcasting, or monaural broadcasting, the sub channel audio signal carrier waves S 2 A pilot signal carrier wave (54.6875kHz) is AM-modulated by an identification signal composed of low frequencies (stereo broadcasting: 117Hz, bilingual broadcasting: 274PH, monaural broadcasting: 0Hz) and is carried by FM modulation.

【表】 Ｒ：右側の音声
Ｌ：左側の音声
Ａ、Ｂ：異なる音声(言語)
一方、これらの音声多重の主、副チヤンネル音
声信号搬送波等を受信する受信機は、例えば前記
の場合はテレビジヨン受信機となるが、次のよう
にして主、副チヤンネル音声信号の可聴音声とし
ての出力を制御している。 すなわち、識別回路部において副チヤンネル用
音声信号中間周波増巾部からのFM復調信号から
パイロツト信号搬送波の存否を、またパイロツト
信号搬送波が存在する場合には、このパイロツト
信号搬送波をAM変調している前記識別信号を検
出して、ステレオ放送、２ケ国語放送あるいはモ
ノラル放送の内容であるかを識別する。この識別
により復調された主、副チヤンネルの音声信号の
いずれかあるいは両者を可聴音声として出力させ
る。 しかしながらこのものでは、主チヤンネル音声
信号搬送波のみしか存在しない場合でも、副チヤ
ンネル用音声信号中間周波増巾部および識別回路
部は常に待機態勢となつている。 このため、モノラルの音声信号再生送出装置を
接続したときに、その装置がスプリアス等の各種
雑音を発生させた場合、殊に装置がビデオテープ
レコーダであるときは、キユーアンドレビユーの
特殊状態にもとづくノイズバーによる高調波雑音
を発生させた場合には、副チヤンネル音声信号搬
送波が存在しないことも相俟つて、パイロツト信
号搬送波の存否さえも検出できずに識別回路部は
誤動作する。 すなわち、副チヤンネル音声信号搬送波自体が
存在しないのにステレオ放送あるいは２ケ国語放
送の副チヤンネルに切換わつてしまう。そして、
搬送波の存在しない信号、つまり雑音にもとづく
副チヤンネル用音声信号中間周波増巾部からの
FM復調信号でもつて、しかも最大利得の復調信
号で可聴音声として出力されて強列なバズ音を発
生させる。 本考案は、このような点に鑑みてなされたもの
であつて、モノラルの音声信号再生送出装置を接
続しても、装置からの各種雑音にもとづく識別回
路部等の誤動作によつて異常バズ音を発生させる
ようなことがない受信機を提供せんとするもので
ある。 上述の目的を達成するために、本考案の受信機
は、復調された副チヤンネル音声信号出力から音
声信号部分を除いた高域成分を抽出するためのハ
イパスフイルタ７と、このハイパスフイルタの出
力を検波して検波出力に基き可聴音声出力を主チ
ヤンネル音声信号のみにするか否かを制御する手
段、即ち、実施例の検波回路部９及び判別回路部
１０とを具備させている。これにより、モノラル
受信時に、副チヤンネル系の雑音で音声多重の正
副チヤンネルの切換系が誤動作しないようにして
いる。 次に、本考案の受信機の一実施例として、本考
案を適用した西独国の音声多重システムにおける
テレビジヨン受信機について図面を参照しつつ説
明する。 第２図は、全体のブロツク回路図である。 同調部１に入力された所定無線周波帯で映像音
声を合わせて同時伝送されてきた信号は、増巾さ
れ周波数変換されて中間周波数となる。この中間
周波数となつた信号は、映像専用の中間周波増巾
部２に与えられ、フイルター等により映像信号部
分が抽出され、増巾され復調等されて出力され
る。一方、中間周波数となつた信号の一部は、音
声信号専用の中間周波増巾部すなわち準パラレル
トン（Quasi Parallelton）３に与えられる。こ
れにより、映像信号の中心周波数部分と音声信号
部分とがフイルター等により抽出され、増巾され
かつ中間周波の映像信号の中心周波数でもつて中
間周波の音声信号が周波数変換されて、夫々が
5.5MHz，5.742MHzの主、副チヤンネル音声信号
搬送波に戻される。そして、この信号は、各主、
副チヤンネル用音声信号中間周波増巾部４，５
夫々に与えられる。主チヤンネル用音声信号中間
周波増巾部４では、フイルター等により5.5MHz
の主チヤンネル音声部分が抽出され、増巾され振
巾制限されかつ復調される。同様に、副チヤンネ
ル用音声信号中間周波増巾部５では、フイルター
等により5.742MHzの副チヤンネル音声信号部分
が抽出され、増巾され振巾制限されかつ復調され
る。この復調された信号の一部は、識別回路部６
に与えられる。これにより、前記のようにパイロ
ツト信号搬送波の存否、またパイロツト信号搬送
波が存在する場合には、このパイロツト信号搬送
波をAM変調している識別信号を検出して、いず
れの放送内容であるかを識別する。そして、識別
結果にもとづき主、副チヤンネルのいずれを、ま
た両者を可聴音声として出力させるかを制御す
る。 また、副チヤンネル用音声信号中間周波増巾部
５からの復調された信号の一部は、高域通過フイ
ルター７にも与えられる。そして、副チヤンネル
音声信号部分を除いた高域側が抽出される。この
抽出された信号は、トラツプ回路部８に与えら
れ、これによりパイロツト信号搬送波部分が除去
される。そして、このパイロツト信号搬送波部分
の除去された信号は、検波回路部９を介して判別
回路部１０に与えられる。 然して、検波回路部９において検波される信号
中には、副チヤンネル音声信号つまり副チヤンネ
ル音声信号搬送波が存在しない場合、副チヤンネ
ル用音声信号中間周波増巾部５において最大利得
で復調され増巾されたFM復調信号、即ち広帯域
雑音が存否する。すなわち、最大利得で復調され
た雑音が広帯域に存在するために、たとえ副チヤ
ンネル音声信号部分およびパイロツト信号搬送波
部分を除いたとしても検波出力は生じる。この検
波出力にもとづき判別回路部１０では、検波出力
のある場合、すなわち副チヤンネル音声信号搬送
波の存在しない場合、強制的に識別回路部６をモ
ノラル放送の識別状態に制御する。言い換えれ
ば、可聴音声出力を主チヤンネル音声信号のみに
する。 これにより副チヤンネル音声信号搬送波が存在
せず、雑音によりパイロツト信号搬送波の存否さ
え検出できない場合においても、バズ音を発生さ
せるようなことはない。 ステレオ放送又は２ケ国語放送で、副チヤンネ
ル音声信号搬送波を受信したときには、副チヤン
ネル用音声中間周波数増巾部５の出力のFM復調
された音声信号には、音声帯域より高域の大レベ
ル雑音は存在しない。このためハイパスフイルタ
７の出力は、パイロツト信号搬送波（54.6875M
Hz）を除いて零であり、このパイロツト信号搬送
波も次のトラツプ回路部８で除去される。従つて
検波回路部１９の出力が零であるから、判別回路
１０がモノラル放送であると誤判別することがな
く、一方、識別回路部６はパイロツト信号搬送波
に基いて正確にステレオ放送又は２ケ国語放送を
弁別する。 なお復調された副チヤンネル音声信号中のパイ
ロツト信号搬送波のレベルは、モノラル放送時の
副チヤンネルの広帯域雑音のレベルよりも格段に
低い。従つてトラツプ回路部８は必要に応じて挿
入する。 本実施例においては、テレビジヨン受信機につ
いて説明をしたが、ラジオ受信機等にも本考案を
適用できることはいうまでもない。 以上要するに本考案の受信機は、副チヤンネル
音声信号搬送波の存否を音声信号帯域より高域の
雑音に基き判別する手段を備えて、この判別手段
の結果にもとづき可聴音声出溶を主チヤンネル音
声信号のみにするように構成したことを特徴とす
るものである。 これにより、副チヤンネル音声信号搬送波の存
在しないモノラルの音声信号再生装置等が接続さ
れ、その装置において識別回路部を誤動作させて
ステレオ放送あるいは２ケ国語放送の副チヤンネ
ルに切換わらせるようなスプリアス等の各種雑音
が発生しても、決して切換わることがない。した
がつて、異常バズ音を発生させるようなことはな
い。[Table] R: Voice on the right side L: Voice on the left side A, B: Different voices (languages)
On the other hand, the receiver that receives the main and sub-channel audio signal carrier waves of these audio multiplexes is, for example, a television receiver in the above case. controls the output of That is, the identification circuit section determines the presence or absence of a pilot signal carrier wave from the FM demodulated signal from the subchannel audio signal intermediate frequency amplification section, and if a pilot signal carrier wave exists, AM modulates this pilot signal carrier wave. The identification signal is detected to identify whether the content is stereo broadcasting, bilingual broadcasting, or monaural broadcasting. Through this identification, either or both of the demodulated main and sub channel audio signals is output as audible audio. However, in this case, even when only the main channel audio signal carrier wave exists, the sub channel audio signal intermediate frequency amplification section and the identification circuit section are always on standby. For this reason, if a monaural audio signal playback/transmission device is connected and that device generates various types of noise such as spurious noise, especially if the device is a video tape recorder, the special condition of queue and playback will occur. If harmonic noise is generated by the original noise bar, combined with the fact that there is no sub-channel audio signal carrier, the identification circuit section will malfunction without even being able to detect the presence or absence of the pilot signal carrier. In other words, the subchannel is switched to a stereo broadcast or a bilingual broadcast even though the subchannel audio signal carrier wave itself does not exist. and,
A signal without a carrier wave, that is, a noise-based audio signal for the subchannel from the intermediate frequency amplification section.
Even if it is an FM demodulated signal, the demodulated signal with the maximum gain is output as an audible sound and generates a strong buzz sound. The present invention was developed in view of these points, and even if a monaural audio signal reproducing and transmitting device is connected, abnormal buzzing noises may occur due to malfunction of the identification circuit section etc. due to various noises from the device. The aim is to provide a receiver that does not cause such occurrences. In order to achieve the above object, the receiver of the present invention includes a high-pass filter 7 for extracting high-frequency components excluding the audio signal portion from the demodulated sub-channel audio signal output, and an output of the high-pass filter 7. It is provided with a means for performing detection and controlling whether or not to output only the main channel audio signal based on the detected output, that is, the detection circuit section 9 and the discrimination circuit section 10 of the embodiment. This prevents the main and sub-channel switching system for audio multiplexing from malfunctioning due to noise in the sub-channel system during monaural reception. Next, as an embodiment of the receiver of the present invention, a television receiver in a West German audio multiplex system to which the present invention is applied will be described with reference to the drawings. FIG. 2 is an overall block circuit diagram. A signal inputted to the tuning unit 1 and transmitted simultaneously with video and audio in a predetermined radio frequency band is amplified and frequency-converted to an intermediate frequency. This intermediate frequency signal is given to an intermediate frequency amplification section 2 dedicated to video, where a video signal portion is extracted by a filter or the like, amplified, demodulated, etc., and output. On the other hand, a part of the intermediate frequency signal is given to an intermediate frequency amplifying section dedicated to audio signals, that is, a quasi parallelton 3. As a result, the center frequency part of the video signal and the audio signal part are extracted by a filter or the like, amplified, and the intermediate frequency audio signal is frequency-converted at the center frequency of the intermediate frequency video signal, so that each of them is
It is returned to the main and sub channel audio signal carrier waves of 5.5MHz and 5.742MHz. And this signal is
Audio signal intermediate frequency amplifying section 4, 5 for sub-channel
given to each. In the main channel audio signal intermediate frequency amplification section 4, the frequency is increased to 5.5MHz by a filter etc.
The main channel audio portion of is extracted, amplified, amplitude limited and demodulated. Similarly, in the sub-channel audio signal intermediate frequency amplification section 5, a 5.742 MHz sub-channel audio signal portion is extracted by a filter or the like, amplified, amplitude-limited, and demodulated. A part of this demodulated signal is transmitted to the identification circuit section 6
given to. As a result, as mentioned above, it is possible to detect the presence or absence of a pilot signal carrier wave, and if a pilot signal carrier wave is present, to detect the identification signal that AM modulates this pilot signal carrier wave, and to identify which broadcast content it is. do. Then, based on the identification result, it is controlled which of the main channel and the sub channel, or both, are to be output as audible audio. Further, a part of the demodulated signal from the sub-channel audio signal intermediate frequency amplification section 5 is also given to the high-pass filter 7. Then, the high frequency side excluding the sub-channel audio signal portion is extracted. This extracted signal is applied to a trap circuit section 8, which removes the pilot signal carrier wave portion. The signal from which the pilot signal carrier wave portion has been removed is applied to the discrimination circuit section 10 via the detection circuit section 9. However, if there is no sub-channel audio signal, that is, a sub-channel audio signal carrier wave, in the signal detected by the detection circuit section 9, the sub-channel audio signal intermediate frequency amplification section 5 demodulates and amplifies it at the maximum gain. The FM demodulated signal, that is, the presence or absence of broadband noise. That is, since the noise demodulated at the maximum gain exists in a wide band, a detection output is generated even if the sub-channel audio signal portion and the pilot signal carrier portion are removed. Based on this detection output, the discrimination circuit section 10 forcibly controls the discrimination circuit section 6 to the monaural broadcast discrimination state when there is a detection output, that is, when there is no sub-channel audio signal carrier wave. In other words, the audible audio output is limited to the main channel audio signal. As a result, even if there is no sub-channel audio signal carrier and the presence or absence of the pilot signal carrier cannot be detected due to noise, no buzz will be generated. When a sub-channel audio signal carrier wave is received in stereo broadcasting or bilingual broadcasting, the FM demodulated audio signal output from the sub-channel audio intermediate frequency amplification section 5 contains large-level noise in frequencies higher than the audio band. does not exist. Therefore, the output of high-pass filter 7 is the pilot signal carrier wave (54.6875M
Hz), and this pilot signal carrier wave is also removed in the next trap circuit section 8. Therefore, since the output of the detection circuit section 19 is zero, the discriminating circuit 10 will not misjudge monaural broadcasting, and on the other hand, the discriminating circuit section 6 will accurately detect stereo broadcasting or two-channel broadcasting based on the pilot signal carrier wave. Distinguish Japanese language broadcasts. Note that the level of the pilot signal carrier wave in the demodulated sub-channel audio signal is much lower than the level of broadband noise of the sub-channel during monaural broadcasting. Therefore, the trap circuit section 8 is inserted as necessary. In this embodiment, a television receiver has been described, but it goes without saying that the present invention can also be applied to radio receivers and the like. In summary, the receiver of the present invention is equipped with a means for determining the presence or absence of a sub-channel audio signal carrier wave based on noise in a frequency higher than the audio signal band, and based on the result of this determination means, the presence or absence of an audible audio signal in the main channel audio signal. This feature is characterized in that it is configured so that only As a result, when a monaural audio signal reproducing device or the like that does not have a sub-channel audio signal carrier wave is connected, spurious signals may be generated that cause the identification circuit section of the device to malfunction and switch to the sub-channel of stereo broadcasting or bilingual broadcasting. Even if various types of noise occur, it will never switch. Therefore, no abnormal buzzing noise is generated.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は西独国のテレビジヨン放送の音声多重
システムを説明する図、第２図は本考案の受信機
をテレビジヨン受信機に適用した場合の一実施例
のブロツク回路図である。 なお、図面に用いられている符号において、６
……識別回路部、７……高域通過フイルター、８
……トラツプ回路部、９……検波回路部、１０…
…判別回路部、である。 FIG. 1 is a diagram illustrating an audio multiplexing system for television broadcasting in West Germany, and FIG. 2 is a block circuit diagram of an embodiment in which the receiver of the present invention is applied to a television receiver. In addition, in the symbols used in the drawings, 6
...Identification circuit section, 7...High-pass filter, 8
...Trap circuit section, 9...Detection circuit section, 10...
...discrimination circuit section.

Claims (1)

【実用新案登録請求の範囲】 夫々の音声信号により夫々異なる周波数の搬送
波が周波数変調された音声多重の主、副チヤンネ
ル音声信号搬送波を受信して夫々のチヤンネルの
音声信号に復調し、副チヤンネル音声信号搬送波
にのるパイロツト信号搬送波に基き音声多重内容
を識別回路部で識別して、この識別により上記復
調された主、副チヤンネル音声信号のいずれかあ
るいは両者を可聴音声として出力する受信機にお
いて、 上記復調された副チヤンネル音声信号出力から
音声信号部分を除いた高域部分を抽出するための
ハイパスフイルタと、このハイパスフイルタの出
力を検波して検波出力に基き可聴音声出力を主チ
ヤンネル音声信号のみにするか否かを制御する手
段とを具備することを特徴とする受信機。[Claims for Utility Model Registration] Receiving the main and sub-channel audio signal carrier waves of audio multiplexing in which carrier waves of different frequencies are frequency-modulated by the respective audio signals, demodulating the audio signals of the respective channels, and generating the sub-channel audio. A receiver that identifies audio multiplexed content based on a pilot signal carrier wave carried on a signal carrier wave by an identification circuit section, and outputs either or both of the demodulated main channel audio signal or both as an audible audio signal based on this identification, A high-pass filter for extracting the high frequency part excluding the audio signal part from the demodulated sub-channel audio signal output, and detecting the output of this high-pass filter and outputting audible audio based on the detected output only from the main channel audio signal. A receiver comprising means for controlling whether or not to
JP5017782U 1982-04-07 1982-04-07 Receiving machine Granted JPS58152061U (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP5017782U JPS58152061U (en) 1982-04-07 1982-04-07 Receiving machine
GB08308771A GB2122458B (en) 1982-04-07 1983-03-30 Stereophonic television receivers
DE19833311947 DE3311947C2 (en) 1982-04-07 1983-03-31 TELEVISION RECEIVER WITH STEREOPHONE SOUND PLAYING DEVICE
NL8301227A NL192284C (en) 1982-04-07 1983-04-07 Television receiver of the type suitable for demodulation of a stereo broadcasting signal.
FR8305679A FR2525059B1 (en) 1982-04-07 1983-04-07 TELEVISION RECEIVER FOR DEMODULATING A BROADCAST STEREOPHONIC SIGNAL

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5017782U JPS58152061U (en) 1982-04-07 1982-04-07 Receiving machine

Publications (2)

Publication Number Publication Date
JPS58152061U JPS58152061U (en) 1983-10-12
JPS6349011Y2 true JPS6349011Y2 (en) 1988-12-16

Family

ID=12851911

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5017782U Granted JPS58152061U (en) 1982-04-07 1982-04-07 Receiving machine

Country Status (5)

Country Link
JP (1) JPS58152061U (en)
DE (1) DE3311947C2 (en)
FR (1) FR2525059B1 (en)
GB (1) GB2122458B (en)
NL (1) NL192284C (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3622016A1 (en) * 1986-07-01 1988-01-07 Grundig Emv DEVICE FOR CONTROLLING THE MODE OF A STEREODECODER
US4907082A (en) * 1988-05-03 1990-03-06 Thomson Consumer Electronics, Inc. Dynamic control menu for a television system or the like
DE4128727C2 (en) * 1991-08-29 2002-02-14 Thomson Brandt Gmbh Method for switching to mono, stereo or two-tone in a television set

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707603A (en) * 1969-12-29 1972-12-26 Rca Corp Fm stereophonic receiver detection apparatus and disabling means
US3790714A (en) * 1970-07-13 1974-02-05 Sony Corp Fm stereophonic receiver
DE2145803C3 (en) * 1971-09-14 1975-04-24 Blaupunkt Werke Gmbh Method and television receiver for the transmission of two television audio channels
DE2929647A1 (en) * 1979-07-21 1981-02-12 Blaupunkt Werke Gmbh HF receiver circuit for e.g. motor vehicle - has stereo to mono changeover with filter and threshold switches to reduce interference
JPS5646346A (en) * 1979-09-21 1981-04-27 Hitachi Ltd Control system for fm stereo demodulation
DE3006271C2 (en) * 1980-02-20 1989-11-02 Loewe Opta Gmbh, 8640 Kronach Integrated audio signal circuit in a television receiver
US4405834A (en) * 1980-10-01 1983-09-20 U.S. Philips Corporation Circuit for receiving two-tone/stereophonic programs
JPS57155852A (en) * 1981-03-20 1982-09-27 Sony Corp Stereo reproducing device
US4393489A (en) * 1981-03-30 1983-07-12 Rca Corporation Audio processor for single, channel, matrixed two-channel and un-matrixed two-channel signals
JPS5871270U (en) * 1981-11-07 1983-05-14 三洋電機株式会社 Audio multiplex circuit malfunction prevention circuit

Also Published As

Publication number Publication date
DE3311947C2 (en) 1992-01-23
JPS58152061U (en) 1983-10-12
FR2525059B1 (en) 1985-07-26
GB2122458B (en) 1986-07-30
GB2122458A (en) 1984-01-11
NL192284C (en) 1997-04-03
NL192284B (en) 1996-12-02
FR2525059A1 (en) 1983-10-14
NL8301227A (en) 1983-11-01
DE3311947A1 (en) 1983-10-13

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