DE1062734B - Circuit arrangement for differential equalization in television receivers - Google Patents

Circuit arrangement for differential equalization in television receivers

Info

Publication number
DE1062734B
DE1062734B DEL24940A DEL0024940A DE1062734B DE 1062734 B DE1062734 B DE 1062734B DE L24940 A DEL24940 A DE L24940A DE L0024940 A DEL0024940 A DE L0024940A DE 1062734 B DE1062734 B DE 1062734B
Authority
DE
Germany
Prior art keywords
signal
tube
circuit arrangement
television receivers
differential
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
Application number
DEL24940A
Other languages
German (de)
Inventor
Kurt Wolf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent Deutschland AG
Original Assignee
Standard Elektrik Lorenz AG
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
Priority to FR1114362D priority Critical patent/FR1114362A/en
Application filed by Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Priority to DEL24940A priority patent/DE1062734B/en
Priority to FR739384A priority patent/FR72614E/en
Priority to GB16529/57A priority patent/GB821119A/en
Priority to DEL27760A priority patent/DE1046097B/en
Priority to FR764738A priority patent/FR73548E/en
Priority to FR766316A priority patent/FR73937E/en
Priority to FR766317A priority patent/FR74441E/en
Priority to GB17354/58A priority patent/GB822158A/en
Priority to FR766763A priority patent/FR74443E/en
Priority to BE570344D priority patent/BE570344A/xx
Priority to GB37538/58A priority patent/GB846058A/en
Priority to FR782519A priority patent/FR74807E/en
Publication of DE1062734B publication Critical patent/DE1062734B/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/205—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic
    • H04N5/208—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic for compensating for attenuation of high frequency components, e.g. crispening, aperture distortion correction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H04N5/165—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level to maintain the black level constant
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
    • H04N5/213—Circuitry for suppressing or minimising impulsive noise
    • 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
    • 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
    • H04N5/52—Automatic gain control
    • H04N5/53—Keyed automatic gain control

Description

DEUTSCHESGERMAN

Die Erfindung betrifft eine Schaltungsanordnung zur Differenzierentzerrung· in Fernsehempfängern, bei der das zu korrigierende Fernsehsignal vor der Video-Endröhre über einen Amplitudenregler einerseits einer Differenzierschaltung, die aus einem Differenzierglied zur Bildung des ersten Differentialquotienten und mindestens einem Röhrensystem besteht, und andererseits einem das Signal verzögernden Laufzeitglied zugeführt wird und das in der Differenzierschaltung geformte Korrektursignal dem verzögernten Videosignal additiv zugesetzt wird.The invention relates to a circuit arrangement for differential equalization in television receivers the television signal to be corrected in front of the video output tube via an amplitude regulator on the one hand Differentiating circuit consisting of a differentiating element for forming the first differential quotient and there is at least one tube system and, on the other hand, fed to a delay element delaying the signal and the correction signal formed in the differentiating circuit is added to the delayed video signal is added additively.

Es ist bekannt, daß außer der normalen, durch die Norm gegebenen Begrenzung auch durch die Fernseh-Übertragungssysteme selbst, wie z. B. Kabelstrecken, Dezimeterverbindungen, Fernsehsender und Fernsehempfänger, eine Frequenzbandbegrenzung bewirkt wird. Die durch die verschiedenen Übertragungssysteme hervorgerufene Frequenzbandbegrenzung zeigt je nach Qualität der Systeme oft recht unterschiedliche Werte. Weiterhin wird aber auch durch den Abtastelektronenstrahl der Kameraröhre die Wiedergabeamplitude für höhere Frequenzen je nach der verwendeten Röhrentype unterschiedlich verkleinert.It is known that, in addition to the normal limitation imposed by the standard, there are also television broadcast systems itself, such as B. Cable routes, decimeter connections, TV transmitters and TV receivers, a frequency band limitation is effected. The frequency band limitation caused by the various transmission systems is shown in often quite different values depending on the quality of the systems. Furthermore, however, is also by the scanning electron beam the camera tube adjusts the playback amplitude for higher frequencies depending on the one used Tube type scaled down differently.

Dem Beschauer eines Fernsehbildes äußern sich diese Erscheinungen in einer Bildqualität mit unter Umständen recht beträchtlich verminderter Konturenschärfe. To the viewer of a television picture, these phenomena express themselves in a picture quality with under Under certain circumstances, the sharpness of the contours is considerably reduced.

Es ist nun ganz allgemein bekannt, zum Zwecke der Flankenversteilerung von verschliffenen Impulssignalen diesen verschieden hohe Ableitungen zuzusetzen (USA.-Patent 1315 539).It is now generally known for the purpose of increasing the edge of smoothed pulse signals to add discharges of different levels to these (USA patent 1315 539).

Weiterhin ist ein von Gouriet angegebenes und als Differenzierentzerrung bezeichnetes Verfahren bekannt, bei dem der Entzerrer den Amplituden- und Phasengang eines Übertragungssystems sendeseitig korrigiert, indem die zweite Ableitung dem zu verbessernden Fernsehsignal mit Hilfe einer Röhrenschaltung negativ hinzugefügt wird. Nach anderen bekannten Anordnungen kann in Fernsehempfängern ein differenziertes Zusatzsignal, z. B. auch in einem der Ausgangskreise der Video-Endröhre, erzeugt werden (britische Patentschrift 698 678).Furthermore, one specified by Gouriet and known as differentiation equalization method, in which the equalizer the amplitude and Phase response of a transmission system corrected on the transmit side by adding the second derivative to the Television signal is added negatively with the help of a tube circuit. According to others known arrangements, a differentiated additional signal, z. B. also in one the output circuits of the video output tube (British Patent 698,678).

Schließlich ist es auch bekannt, die Phasenbeziehung zwischen dem differenzierten und dem zu korrigierenden Signal derart zu wählen, daß das Überschwingen statt in Form eines Nachschwingens in Form eines Vorschwingens (»Vorplastik«) auftritt (USA.-Patentschrift 2 740 071).Finally, it is also known the phase relationship between the differentiated and the corrected Signal to choose such that the overshoot instead of in the form of a ringing in the form of a Vorschwingens ("Vorplastik") occurs (US Pat. No. 2,740,071).

Alle diese Schaltungen erfordern jedoch einen erheblichen Aufwand an Schaltmitteln, wenn sie den für Fernsehempfänger zu fordernden erhöhten Qualitätsforderungen standhalten sollen, und erfordern einen Betrieb bei relativ hohen Pegeln. Darüber hinaus benötigen die bekannten Anordnungen zur Entkopplung SchaltungsanordnungHowever, all of these circuits require a considerable amount of switching means if they are for Television receivers are to withstand demanding increased quality requirements, and require a Operation at relatively high levels. In addition, the known arrangements require decoupling Circuit arrangement

zur Differenzierentzerrungfor differentiation equalization

in Fernsehempfängernin television receivers

Anmelder:Applicant:

Standard Elektrik LorenzStandard electrical system Lorenz

Aktiengesellschaft,Corporation,

Stuttgart-Zuff enhausen,Stuttgart-Zuff enhausen,

Hellmuth-Hirth-Str. 42Hellmuth-Hirth-Str. 42

Kurt Wolf, Wüdbad (Schwarzw.),
ist als Erfinder genannt wordenKurt Wolf, Wüdbad (Black and White),
has been named as the inventor

des Übertragungs- und des Differenzierkanals zum Teil eine besondere Trenn- oder Mischröhre.of the transmission and the differentiation channel partly have a special separating or mixing tube.

Die Erfindung ist dadurch gekennzeichnet, daß als Verstärkerröhre für das Korrektursignal die Tonendröhre des Fernsehempfängers verwendet wird und Mittel zur Entkopplung des Tonsignals und des Korrektursignals vorgesehen sind.The invention is characterized in that the sound tube is used as the amplifier tube for the correction signal of the television receiver is used and means for decoupling the audio signal and the correction signal are provided.

Es wird bemerkt, daß es in einem anderen Zusammenhang bekannt ist, in Rundfunkempfängern Tonfrequenzverstärkerröhren gleichzeitig auch zur Verstärkung von Regelgleichspannungen auszunutzen (USA-Patentschriften 1988 370, 1990 512).It is noted that it is known in another context, audio frequency amplifier tubes in radio receivers at the same time to use for the amplification of control DC voltages (USA patents 1988 370, 1990 512).

Die Erfindung wird an Hand der Zeichnung, welche ein Ausführungsbeispiel zeigt, näher erläutert.The invention is explained in more detail with reference to the drawing, which shows an exemplary embodiment.

Das Videosignal wird vom Amplitudenregler R1 im Kathodenkreis der Video-Vorröhre V1 über ein beispielsweise aus einer Induktivität und einer Kapazität bestehendes Laufzeitglied L1, C2 und den Widerstand R3 der Video-Endröhre V2 mit dem Anodenwiderstand i?4 zugeführt. Außerdem wird das Signal vor dem Laufzeitglied abgegriffen und über den Kondensator C1 und den Widerstand R6 der Differenzierverstärkerröhre V3, die zugleich Tonendröhre des Fernsehempfängers ist, zugeführt und verstärkt und dann vom Anodenwiderstand Rs aus über C3 zu dem verzögerten Videosignal linear addiert. Das Glied C3, R3, i?2 ist als Differenzierglied ausgebildet. Durch den Widerstand R3 wird gleichzeitig eine Rückkopplung vermieden. Durch Variation der Vorspan-The video signal is generated by the amplitude controller R 1 in the cathode circuit of the video pre-tube V 1 via a delay element L 1 , C 2, consisting for example of an inductance and a capacitance, and the resistor R 3 of the video output tube V 2 with the anode resistance i? 4 supplied. In addition, the signal is tapped before the delay element and fed via the capacitor C 1 and the resistor R 6 to the differential amplifier tube V 3 , which is also the audio tube of the television receiver, and then added linearly from the anode resistor R s via C 3 to the delayed video signal . The link C 3 , R 3 , i? 2 is designed as a differentiating element. Feedback is avoided at the same time by the resistor R 3. By varying the preload

909 580/158909 580/158

tiung —Ug kann die Amplitude
träges geregelt werden.tiung - Ug can be the amplitude
be regulated sluggishly.

des zugesetzten Be-of the added loading

Claims (1)

Pa TENTANSPRUCH:Pa TENT CLAIM: Schaltungsanordnung zur Differenzierentzerrung in Fernsehempfängern, bei der das zu korrigierende Fernsehsignal vor der Video-Endröhre über einen Amplitudenregler einerseits einer aus einem Differenzierglied zur Bildung des ersten Differentialquotienten und mindestens einem Röhrensystem bestehenden Differenzierschaltung und andererseits einem das Signal verzögernden Laufzeitglied zugeführt wird und das in der Differenzierschaltung geformte Korrektursignal dem verzögerten Videosignal additiv zugesetzt wird, dadurch gekennzeichnet, daß als Verstärkerröhre für das Korrektursignal die Tonendröhre des Fernsehempfängers verwendet wird und Mittel zur Entkopplung des Tonsignals und des Korrektursignals vorgesehen sind.Circuit arrangement for differential equalization in television receivers, in which the TV signal in front of the video output tube via an amplitude regulator on the one hand one from one Differentiator for forming the first differential quotient and at least one tube system existing differentiating circuit and on the other hand fed to a delay element delaying the signal and the correction signal formed in the differentiating circuit is added to the delayed video signal is added additively, characterized in that as an amplifier tube for the correction signal the audio tube of the television receiver is used and means for decoupling the Sound signal and the correction signal are provided. In Betracht gezogene Druckschriften:
Französische Patentschrift Nr. 1 111 454;
USA.-Patentschriften Nr. 1 988 370, 1 990 512,
740 071.Considered publications:
French Patent No. 1,111,454;
U.S. Patents Nos. 1,988,370, 1,990,512,
740 071. Hierzu 1 Blatt Zeichnungen1 sheet of drawings ©909 580/158 7.59© 909 580/158 7.59
DEL24940A 1956-05-25 1956-05-25 Circuit arrangement for differential equalization in television receivers Pending DE1062734B (en)

Priority Applications (13)

Application Number Priority Date Filing Date Title
FR1114362D FR1114362A (en) 1956-05-25 1954-09-03 Television signal control device
DEL24940A DE1062734B (en) 1956-05-25 1956-05-25 Circuit arrangement for differential equalization in television receivers
FR739384A FR72614E (en) 1956-05-25 1957-05-24 Television signal control device
GB16529/57A GB821119A (en) 1956-05-25 1957-05-24 Circuit arrangements for differential correction of television receivers
DEL27760A DE1046097B (en) 1956-05-25 1957-05-31 Circuit arrangement for achieving automatic gain control
FR764738A FR73548E (en) 1956-05-25 1958-05-02 Television signal control device
FR766317A FR74441E (en) 1956-05-25 1958-05-23 Television signal control device
FR766316A FR73937E (en) 1956-05-25 1958-05-23 Television signal control device
GB17354/58A GB822158A (en) 1956-05-25 1958-05-30 Circuit arrangement for obtaining automatic gain control
FR766763A FR74443E (en) 1956-05-25 1958-05-30 Television signal control device
BE570344D BE570344A (en) 1956-05-25 1958-08-14
GB37538/58A GB846058A (en) 1956-05-25 1958-11-21 Television receiver circuit
FR782519A FR74807E (en) 1956-05-25 1958-12-23 Television signal control device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DEL24940A DE1062734B (en) 1956-05-25 1956-05-25 Circuit arrangement for differential equalization in television receivers
DEL27760A DE1046097B (en) 1956-05-25 1957-05-31 Circuit arrangement for achieving automatic gain control
DE846058X 1957-12-24

Publications (1)

Publication Number Publication Date
DE1062734B true DE1062734B (en) 1959-08-06

Family

ID=27207631

Family Applications (2)

Application Number Title Priority Date Filing Date
DEL24940A Pending DE1062734B (en) 1956-05-25 1956-05-25 Circuit arrangement for differential equalization in television receivers
DEL27760A Pending DE1046097B (en) 1956-05-25 1957-05-31 Circuit arrangement for achieving automatic gain control

Family Applications After (1)

Application Number Title Priority Date Filing Date
DEL27760A Pending DE1046097B (en) 1956-05-25 1957-05-31 Circuit arrangement for achieving automatic gain control

Country Status (4)

Country Link
BE (1) BE570344A (en)
DE (2) DE1062734B (en)
FR (7) FR1114362A (en)
GB (3) GB821119A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1286080B (en) * 1963-08-23 1969-01-02 Rank Bush Murphy Ltd Circuit arrangement for the transmission of video signals
EP0064415A2 (en) * 1981-05-07 1982-11-10 Rca Corporation Dynamic de-emphasis compensation system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1176180B (en) * 1956-11-07 1964-08-20 Fernseh Gmbh Circuit arrangement for limiting the amplitude of television signals
DE1184792B (en) * 1960-01-26 1965-01-07 Loewe Opta Ag Circuit arrangement for generating control voltage in television receivers
DE1242676B (en) * 1961-01-26 1967-06-22 Telefunken Patent Circuit arrangement for automatic gain control in television receivers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1988370A (en) * 1929-12-06 1935-01-15 Philadelphia Storage Battery Automatic volume control
US1990512A (en) * 1931-12-18 1935-02-12 Bell Telephone Labor Inc Radioreceiver
FR1111454A (en) * 1953-11-04 1956-02-27 Marconi Wireless Telegraph Co Improvements to electrical networks used for the adjustment and correction of the frequency response
US2740071A (en) * 1950-05-11 1956-03-27 Columbia Broadcasting Syst Inc Television

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE970151C (en) * 1953-04-02 1958-08-21 Saba Gmbh Arrangement for noise suppression when receiving frequency-modulated vibrations

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1988370A (en) * 1929-12-06 1935-01-15 Philadelphia Storage Battery Automatic volume control
US1990512A (en) * 1931-12-18 1935-02-12 Bell Telephone Labor Inc Radioreceiver
US2740071A (en) * 1950-05-11 1956-03-27 Columbia Broadcasting Syst Inc Television
FR1111454A (en) * 1953-11-04 1956-02-27 Marconi Wireless Telegraph Co Improvements to electrical networks used for the adjustment and correction of the frequency response

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1286080B (en) * 1963-08-23 1969-01-02 Rank Bush Murphy Ltd Circuit arrangement for the transmission of video signals
EP0064415A2 (en) * 1981-05-07 1982-11-10 Rca Corporation Dynamic de-emphasis compensation system
EP0064415A3 (en) * 1981-05-07 1983-01-12 Rca Corporation Dynamic de-emphasis compensation system
US4400720A (en) * 1981-05-07 1983-08-23 Rca Corporation Dynamic de-emphasis compensation system

Also Published As

Publication number Publication date
BE570344A (en) 1961-09-08
FR74441E (en) 1960-12-19
FR74443E (en) 1960-12-19
FR1114362A (en) 1956-04-11
FR73548E (en) 1960-08-22
FR74807E (en) 1961-03-03
FR72614E (en) 1960-04-22
GB846058A (en) 1960-08-24
FR73937E (en) 1960-10-31
GB822158A (en) 1959-10-21
DE1046097B (en) 1958-12-11
GB821119A (en) 1959-09-30

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