DE1010565B - Television receiver with an audio intermediate frequency amplifier that can be switched to at least two frequencies, in particular multi-standard television receiver - Google Patents
Television receiver with an audio intermediate frequency amplifier that can be switched to at least two frequencies, in particular multi-standard television receiverInfo
- Publication number
- DE1010565B DE1010565B DET12014A DET0012014A DE1010565B DE 1010565 B DE1010565 B DE 1010565B DE T12014 A DET12014 A DE T12014A DE T0012014 A DET0012014 A DE T0012014A DE 1010565 B DE1010565 B DE 1010565B
- Authority
- DE
- Germany
- Prior art keywords
- television receiver
- diode
- voltage
- intermediate frequency
- switched
- 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
- 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
- H04B1/26—Circuits for superheterodyne receivers
-
- 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
- H04N5/46—Receiver circuitry for the reception of television signals according to analogue transmission standards for receiving on more than one standard at will
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Amplifiers (AREA)
Description
DEUTSCHESGERMAN
Die Erfindung betrifft Fernsehempfänger, bei denen parallel zum Bildzwischenfrequenzverstärker bzw. zu einem Teil desselben ein Tonzwischenfrequenzverstärker für die Übertragung des Fernsehbegleittones bzw. eines UKW-Hörrundfunkprogramms vorgesehen ist, der auf verschiedene Zwischenfrequenzen umschaltbar ist.The invention relates to television receivers in which parallel to the intermediate frame frequency amplifier or to a part of the same a audio intermediate frequency amplifier for the transmission of the television accompanying sound or a VHF radio program is provided, which is on different intermediate frequencies is switchable.
Bei Mehrnormenfernsehgeräten ist es z. B. bekannt, zur Umschaltung des Empfängers von einer Fernsehnorm auf eine andere Fernsehnorm mit unterschiedlichem Abstand des Tonträgers vom Bildträger in den Anodenkreis der Mischröhre oder einer der Zwischenfrequenzverstärkerröhren in Serie mehrere auf die verschiedenen Tonträgerzwischenfrequenzen abgestimmte Schwingkreise einzuschalten. Bei derartigen bekannten Anordnungen besteht der Nachteil, daß Störungen, die im Frequenzbereich des nicht benutzten Tonzwischenfrequenzkanals liegen, ebenfalls verstärkt werden und daher hörbar werden. Aber auch, wenn die nicht benutzten Schwingkreise in bekannter Weise durch Schalter kurzgeschlossen oder abgeschaltet werden, führt eine solche Anordnung zu Störungen, da die Schalterkontakte in diesem Fall durch ihre Kapazität Rückkopplungen bewirken.In multi-standard televisions it is z. B. known to switch the receiver from a television standard to a different television standard with a different distance between the sound carrier and the image carrier in the Anode circuit of the mixer tube or one of the intermediate frequency amplifier tubes in series several on the to switch on resonant circuits that are tuned to different sound carrier intermediate frequencies. With such known arrangements has the disadvantage that interference in the frequency range of the not used Intermediate frequency channel are also amplified and therefore audible. But even if the unused resonant circuits short-circuited or switched off in a known manner by switches such an arrangement leads to interference, since the switch contacts in this case by their Causing capacitance feedback.
Es ist ferner bekannt, zur Vermeidung dieses Nachteils zwei getrennte Verstärkerkanäle, einen für jeden Tonträger, parallel zueinander anzuordnen und durch am Anfang und am Ende der beiden Verstärkerkanäle liegende Schalter wahlweise einschaltbar zu machen. Diese Schaltung hat jedoch nicht nur den Nachteil, daß ein doppelter Aufwand an Röhren, Schaltelementen usw. erforderlich ist, sondern daß durch die Kontakte der beiden Schalter ebenfalls entweder, bei dicht nebeneinanderliegenden Schaltern, eine Rückkopplung vom Ausgang zum Eingang des Verstärkers über die Schalterkapazitäten auftritt oder daß bei räumlicher Trennung der Schalter die gleichzeitige Betätigung nur mittels zusätzlicher mechanischer Kupplungsmittel möglich ist. Diese Nachteile vermeidet die Erfindung.It is also known to avoid this disadvantage with two separate amplifier channels, one for each Sound carriers, to be arranged parallel to each other and through at the beginning and at the end of the two amplifier channels to make horizontal switches optionally switchable. However, this circuit not only has the disadvantage that a double expense of tubes, switching elements, etc. is required, but that by the contacts of the two switches also either, in the case of switches that are close to one another, one Feedback from the output to the input of the amplifier occurs via the switch capacitances or that If the switches are spatially separated, they can only be operated simultaneously by means of additional mechanical ones Coupling agent is possible. The invention avoids these disadvantages.
Die Erfindung besteht darin, daß vor oder hinter einer Tonzwischenfrequenzverstärkerstufe eine auf die jeweils nicht zu verstärkenden Frequenzen umschaltbare Sperrfilteranordnung eingeschaltet ist. Dadurch wird erreicht, daß die Störungen, die im Frequenzbereich des nicht benutzten Tonkanals liegen, unterdrückt werden und daß eine Rückkopplung über die Schalterkontakte nicht erfolgen kann.The invention consists in that before or after an audio intermediate frequency amplifier stage one on the in each case not to be amplified frequencies switchable notch filter arrangement is switched on. Through this it is achieved that the interferences in the frequency range of the unused audio channel are suppressed and that feedback via the switch contacts cannot take place.
Zur näheren Erläuterung der Erfindung sollen im folgenden mehrere Ausführungsbeispiele an Hand der Zeichnung näher beschrieben werden.To explain the invention in more detail, several exemplary embodiments will be given below with reference to the Drawing will be described in more detail.
Von diesen zeigt Fig. 1 als Blockschaltbild einen Tonzwischenfrequenzverstärker 1 mit zwei bei diesem Beispiel vor den Eingang des Verstärkers geschal-Fernsehempfänger mit einem aufOf these, Fig. 1 shows as a block diagram an audio intermediate frequency amplifier 1 with two in this Example in front of the input of the amplifier schal television receiver with one up
mindestens zwei Frequenzen umschaltbaren Tonz wis chenf r equenz ver stärker,at least two frequencies switchable tone frequency amplifier,
insbesondere
Mehrnormenf erns ehempf angerin particular
Mehrnormenf erns ärpf anger
Anmelder:Applicant:
Telefunken G. m. b. H.,
Berlin NW 87, Sickingenstr. 71Telefunken G. mb H.,
Berlin NW 87, Sickingenstr. 71
Dipl.-Ing. Klaus Hecker und Hans-Günther Schulze,Dipl.-Ing. Klaus Hecker and Hans-Günther Schulze,
Hannover,
sind als Erfinder genannt wordenHanover,
have been named as inventors
te ten Filtern 2 und 3 sowie den beiden Schaltern 4 und 5, die zur wahlweisen Einschaltung eines der beiden Filter in den Verstärkerkanal dienen. Aus dieser Abbildung ist zu ersehen, daß eine Rückkopplung über die Kapazität der in der praktischen Ausführung dicht nebeneinanderliegenden Schalterkontakte nicht schädlich ist, da zwischen den Schaltern keine Verstärkung erfolgt.te th filters 2 and 3 and the two switches 4 and 5, which can be used to switch on one of the both filters are used in the amplifier channel. From this figure it can be seen that a feedback on the capacity of the switch contacts, which are close to one another in the practical version is not harmful as there is no amplification between the switches.
Fig. 2 zeigt ein anderes Ausführungsbeispiel der Erfindung, bei dem die erste Stufe des Tonzwischenfrequenzverstärkers aus zwei als Cascode geschalteten Trioden 6 und 7 gebildet wird. Im Anodenkreis der Triode 7 sind in bekannter Weise zwei in Serie geschaltete Schwingkreise 8 und 9 vorgesehen, deren jeder auf eine andere der beiden möglichen Tonträgerfrequenzen abgestimmt ist. Zwischen die Anode der Röhre 6 und die Katode der Röhre 7 ist nun zusätzlich eine Filteranordnung eingeschaltet, die im wesentlichen aus zwei Sperrkreisen 10 und 11 besteht, deren jeder auf eine andere der beiden unterschiedlichen Tonträgerfrequenzen abgestimmt ist. Die Umschaltung der Filteranordnung auf die verschiedenen Frequenzbereiche erfolgt durch zwei Schalter 12 und 13, deren jeder parallel zu einem der Sperrkreise 10 und 11 liegt.Fig. 2 shows another embodiment of the invention in which the first stage of the audio intermediate frequency amplifier is formed from two triodes 6 and 7 connected as a cascode. In the anode circuit of the triode 7 there are two in series in a known manner switched resonant circuits 8 and 9 are provided, each of which is based on a different one of the two possible sound carrier frequencies is matched. Between the anode of the tube 6 and the cathode of the tube 7 is now an additional a filter arrangement is switched on, which essentially consists of two blocking circuits 10 and 11, each of which is tuned to a different one of the two different sound carrier frequencies. The switchover the filter arrangement on the different frequency ranges is carried out by two switches 12 and 13, each of which is parallel to one of the trap circuits 10 and 11.
Die Schalter 12 und 13 können auch gemäß Fig. 3, in der gleiche Schaltelemente wie in Fig. 2 mit gleichen Bezugszeichen versehen sind, durch sogenannte Schalterdioden ersetzt werden. Zur Überbrückung je eines Sperrkreises sind dann parallel zu diesen zwei Schalterdioden 14 und 15 geschaltet,The switches 12 and 13 can also according to FIG. 3, in the same switching elements as in FIG The same reference numerals are provided, are replaced by so-called switch diodes. To bridge one blocking circuit each are then connected in parallel to these two switch diodes 14 and 15,
709 549/147709 549/147
Claims (5)
Deutsche Auslegeschrift T 8016 VIII a/21 a'.Considered publications:
German interpretation document T 8016 VIII a / 21 a '.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DET12014A DE1010565B (en) | 1956-03-22 | 1956-03-22 | Television receiver with an audio intermediate frequency amplifier that can be switched to at least two frequencies, in particular multi-standard television receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DET12014A DE1010565B (en) | 1956-03-22 | 1956-03-22 | Television receiver with an audio intermediate frequency amplifier that can be switched to at least two frequencies, in particular multi-standard television receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1010565B true DE1010565B (en) | 1957-06-19 |
Family
ID=7546886
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DET12014A Pending DE1010565B (en) | 1956-03-22 | 1956-03-22 | Television receiver with an audio intermediate frequency amplifier that can be switched to at least two frequencies, in particular multi-standard television receiver |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1010565B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1154532B (en) * | 1959-10-10 | 1963-09-19 | Philips Nv | Receiver for optional reception of amplitude- or frequency-modulated electrical high-frequency oscillations |
DE1286157B (en) * | 1967-07-13 | 1969-01-02 | Standard Elektrik Lorenz Ag | Remote control circuit for contactless connection of a component of quartz oscillators |
FR2458943A1 (en) * | 1979-06-05 | 1981-01-02 | Victor Company Of Japan | FREQUENCY MODULATED SIGNAL DEMODULATION CIRCUIT |
DE3125331A1 (en) * | 1981-06-27 | 1983-01-20 | Gorenje Körting Electronic GmbH & Co, 8217 Grassau | Switchable audio IF amplifier for television receivers |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8016C (en) * | R. E. ASMIS in Berlin, Dennewitzstrafse 36, pt | Glued together bullet for hunting rifles |
-
1956
- 1956-03-22 DE DET12014A patent/DE1010565B/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8016C (en) * | R. E. ASMIS in Berlin, Dennewitzstrafse 36, pt | Glued together bullet for hunting rifles |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1154532B (en) * | 1959-10-10 | 1963-09-19 | Philips Nv | Receiver for optional reception of amplitude- or frequency-modulated electrical high-frequency oscillations |
DE1286157B (en) * | 1967-07-13 | 1969-01-02 | Standard Elektrik Lorenz Ag | Remote control circuit for contactless connection of a component of quartz oscillators |
FR2458943A1 (en) * | 1979-06-05 | 1981-01-02 | Victor Company Of Japan | FREQUENCY MODULATED SIGNAL DEMODULATION CIRCUIT |
DE3125331A1 (en) * | 1981-06-27 | 1983-01-20 | Gorenje Körting Electronic GmbH & Co, 8217 Grassau | Switchable audio IF amplifier for television receivers |
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