DK157279B

DK157279B - APPARATUS UNIT FOR APPLIANCES IN THE COMMUNICATION TECHNIQUE

Info

Publication number: DK157279B
Application number: DK435584A
Authority: DK
Inventors: Gerhard Maier
Original assignee: Thomson Brandt Gmbh
Priority date: 1982-11-20
Filing date: 1984-09-12
Publication date: 1989-11-27
Also published as: EP0109661A1; ATE29191T1; FI843678A0; FI82792C; FI82792B; DE3242965C1; FI843678L; DK435584A; WO1984002236A1; DK157279C; DE3373247D1; DK435584D0; EP0109661B1

Abstract

Upon the selection of a desired reception channel, the tuner oscillator (9) is switched off, while an oscillator (15) simulating reception signals is switched on at the antenna input and is switched alternatingly on at least two frequencies within the reception channel. A R.F. signal demodulator (16) provides to a microprocessor (13) a criterion to indicate an optimum tuning. The obtained tuning voltage is conducted to the R.F. circles (3-5) to be adjusted after digital/analogue transformation (18-20), up to the end of the adjustment of all circles.

Description

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Den foreliggende opfindelse angar en afstemningsenhed (tuner) til apparater inden for kommunikationsteknikken, navnlig fjernsyns- og radiomodtageapparatef under anvendelse af et PLL-sy-stem, der ved afstemningen af modtageapparatet indstiller de enkelte 5 afstemnïngskredse efter hinanden pi optimale værdier og tildeler de enkelte filterkredse de fastlagte afstemningsværdier.The present invention relates to a tuning unit (tuner) for apparatus in the communication technique, in particular television and radio receiver apparatus, using a PLL system which, when tuning the receiving apparatus, sets each of the 5 tuning circuits consecutively at optimal values and assigns the individual filter circuits the established voting values.

En sadan afstemningsenhed er beskrevet f.eks. i DE-OS 28 54 852, som ved hjælp af tre hjælpeoscillatorer og til disse h0rende analog lagre under anvendelse af PLL-koblingen afstemmer h0jfre-10 kvenskredsene til den 0nskede modtagefrekvens. Ved denne afstemningsenhed bliver tuneroscillatoren ogsl anvendt ved indstillingen. Desuden kræves der til antallet af h0jfrekvenskredsene, som skal indstïlles, svarende hjælpeoscillatorer. Antallet af de krævede hjaelpe-oscillatorer og dermed materialeforbruget for0ges i særlig grad, nar 15 f.eks. ved indstilling af en farvefjernsynsmodtager blnd I, band III og bândene IV og V skal indstïlles. Der er her fare for flertydig-heder mellem frekvenserne af tuneroscillatoren, hjælpeoscillatorerne og modtagefrekvenserne. Det er for en praktisk realisering af den fore-slaede afstemningsenhed en ulempe, at magnetiseringsviklingerne i 20 hjælpeoscillatorerne med de enkelte spoler i h0jfrekvenskredsene kan fremkalde u0nskede resonanser og dæmpninger af kredsene, som yderligere forarsager en ukontrollerbar forstemning af kredsene, nir hjælpeoscillatorerne efter udf0rt justering er udkoblet. Desuden findes der analoge lagre, som skal genlades i tidsmæssige afstande for at 25 opretholde de optimale afstemningsværdier. Af disse grunde er en optimal justering af modtageapparatet principbetinget ikke opnielïg. Desuden bliver forstyrrelser pa grund af den I0bende gentagne efter-afstemning synlige eller h0rbare pa billedskærmen eller i h0jttaleren.Such a voting unit is described e.g. in DE-OS 28 54 852 which, by means of three auxiliary oscillators and to these corresponding analog bearings using the PLL coupling, the high frequency circuits match the desired reception frequency. In this tuning unit, the tuner oscillator is also used in the setting. In addition, the number of high frequency circuits to be set corresponding to auxiliary oscillators is required. The number of required auxiliary oscillators and thus the material consumption is increased to a greater extent when e.g. When tuning a color television receiver Blind I, Band III and the bands IV and V must be set. Here, there is a danger of ambiguities between the frequencies of the tuner oscillator, auxiliary oscillators, and reception frequencies. For a practical realization of the proposed tuning unit, it is a disadvantage that the magnetizing windings of the 20 auxiliary oscillators with the individual coils in the high frequency circuits can produce undesirable resonances and attenuations of the circuits which further cause an uncontrollable tuning of the circuits after the auxiliary oscillators. disconnected. In addition, there are analog stocks that must be recharged at temporal distances to maintain the optimum tuning values. For these reasons, an optimal adjustment of the receiving device is in principle not achievable. Also, interruptions due to the ongoing repeated post-tuning become visible or audible on the screen or speaker.

I tidsskriftet "Nachrichten elektronik", hæfte 11/79, side 30 365-368 beskrives en afstemningsmetode for radiomodtagere, som ligeledes anvender ekstra hjælpekredse i hpjfrekvensfïltrene. Ogsi her fis uheldige pavirkninger af kredsene ved driften af modtageren, som skal justeres. Som angivet pa side 367, venstre og midterste spalte, bliver npjagtigheden af afstemningerne ved hjælp af spécialkomponen-35 ter kun opniet i form af npjagtigt parrede dioder. Ogsi dette kræver en omkostning, der ikke kan lades ude af betragtning.The journal "Nachrichten electronics", booklet 11/79, pages 30 365-368 describes a tuning method for radio receivers, which also uses extra auxiliary circuits in the high frequency filters. Here, too, adverse effects of the circuits occur during the operation of the receiver, which must be adjusted. As indicated on page 367, left and middle column, the accuracy of the tuning by means of special components 35 is obtained only in the form of neatly paired diodes. This also requires a cost that cannot be ignored.

Formalet med den foreliggende opfindelse er at tilvejebrînge en automatisk selvjustering af kommunikationsmodtageapparater uden de ovenfor anfprte ulemper og uden anvendelse af uds0gte komponenter 2The object of the present invention is to provide an automatic self-adjustment of communication receiver devices without the disadvantages mentioned above and without the use of selected components 2

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og med det mal at opna en maksimal amplitude og en optimal selektion ved aile modtageomrader uden at indgribe i HF-modtageenheden. If0lge opfindelsen opnas dette ved hjælp af de i patentkrav 1's kendetegnende del angivne foranstaltninger.and with the goal of achieving a maximum amplitude and an optimal selection at all receiving regions without interfering with the HF receiving unit. According to the invention, this is achieved by the measures specified in the characterizing part of claim 1.

5 Opfindelsen skal herefter forklares nærmere i forbindelse med et udfprelseseksempel under henvisning til tegning, hvor fig. 1 viser et blokdiagram over en udf0relsesform for afstemningsenheden if0lge opfindelsen, fig. 2 frekvensgennemgangskurver for en modtager til 10 forklaring af virkemâden af anordningen i fig. 1, og fig. 3 afstemningsspændingsgrænserne for de forskellige kredse.The invention will then be explained in more detail in connection with an embodiment example with reference to a drawing, in which fig. 1 is a block diagram of one embodiment of the voting unit according to the invention; FIG. 2 shows frequency frequencies for a receiver for explaining the operation of the device of FIG. 1, and FIG. 3 the tuning voltage limits for the different circuits.

Pl tegningen er ved 1 vist en h0jfrekvensdel i et kommunï-15 kationsmodtageapparat, f.eks. en fjernsynsmodtager. Modtagesignalet f0res til denne modtagedel over en antenne 2 og bliver selekteret ved hjælp af h0jfrekvenskredse 3,4,5 og forstærket ved hjælp af for-stærkere 6,7. I et blandetrin 8 frembringes mellemfrekvenssignalet, Sôm opstar ved overlejring med en fra en oscillator 9 tilf0rt frekvens.The pl drawing is shown at 1 a high frequency part of a communication receiver apparatus, e.g. a television receiver. The receive signal is fed to this receiving portion over an antenna 2 and is selected by high frequency circuits 3,4,5 and amplified by amplifier 6.7. In a mixing step 8, the intermediate frequency signal is generated, which occurs by superposition with a frequency applied from an oscillator 9.

20 Osciliatoren 9 bliver indstillet i frekvens ved hjælp af en PLL-kob-ling, som bestar af en til osciliatoren 9 sluttet frekvensdeler 10 og en fasekomparator 11, som tilf0res en af et kvarts 12 frembragt stabil referencefrekvens. De forskellige oscillatorfrekvenser opstar ved ændring af delefaktoren for den programmerbare og af en mikro-25 processor 13 over en dataledning 14 styrede frekvensdeler 10. Den automatiske îndstîllïng af modtageapparatet foreglr pâ f0lgende mâde.The oscillator 9 is tuned in frequency by a PLL coupling consisting of a frequency divider 10 connected to the oscillator 9 and a phase comparator 11 applied to a steady reference frequency produced by a quartz 12. The various oscillator frequencies arise by changing the partition factor of the programmable and frequency part 10. Controlled by a data line 14 over a data line 14 The automatic tuning of the receiving device takes place in the following way.

Ved hvert nyt kanalvalg, som ligeledes styres over mikro-processoren 13, bliver modtageoscîllatoren 9 udkoblet, og i stedet for bliver en enkelt hele modtagefrekvensomradet dækkende ekstraoscillator 30 15 indstillet pâ mindst to omskiftelige frekvenser, som karakteriserer den 0nskede HF-gennemgangskurve og ved hjælp af den tilstedeværende PLL-kobling 10,11,12 stabilt svingende sluttet til antenneindgangen pa modtagekredsl0bet. Begyndende med kredsen 3 og sluttende ved den sidste kreds 5 efter hinanden bliver der nu indstillet pâ en optimal ud-35 gangsspænding efter det sidste trin. Med henblik pâ en symmetrîsk ju-stering bliver ekstraoscillatoren 15, styret over dataledningen fra mikro-processoren 13, afvekslende omskiftet hver gang til mindst to frekvenser, som îmidlertid er afhængige af den valgte modtagekanal. Over en detektor-kobling 16 bliver resultatet tilfprt mikroprocessoren 13, efter at det ved 3At each new channel selection, which is also controlled over the microprocessor 13, the receiving oscillator 9 is switched off, and instead a single entire receiving frequency range covering extra oscillator 30 15 is tuned to at least two switchable frequencies which characterize the desired HF through curve and the PLL coupling present 10,11,12 stably pivotally connected to the antenna input on the receiving circuit. Starting with the circuit 3 and ending with the last circuit 5 in succession, an optimal output voltage is now set after the last step. For a symmetrical adjustment, the extra oscillator 15, controlled over the data line from the microprocessor 13, is alternately switched each time to at least two frequencies, which, however, are dependent on the selected receiving channel. Over a detector coupling 16, the result is applied to the microprocessor 13 after it reaches 3

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hjælp af en analog-digitalomsætter 17 er blevet passende omformet. Afstem-ningsspændingerne bliver individuelt ændret kontinuerligt og fra mikropro-cessoren 13 over digital-analogomsættere 18,19,20 tilf0rt de enkelte kredse, indtil det fastlagte udgangskriterium forefindes pi analog-digitalomsætteren 5 17. Ved digital-analogomsætterne drejer det sig om statiske monotone omsæt- tere, d.v.s. de bliver efter dataindlæsningen adskilt fra mikroprocessoren 13 for at undga apparatforstyrrelser og for at bibeholde det digitale ord en-ten indtil afstemningen pâ en anden kanal eller indtil en finafstemning. Den-ne automatiske afstemning sker ved hver ny kanalindstilling. En justering af 10 kredsene under fremstillingen af modtageapparatet kan f0lgelig udelades. Ved en forenklet anordning kan den ekstra oscillator være indstillelig pi kun en enkelt frekvens i den valgte modtagekanal, si at den optimale indstilling kun sker pâ denne frekvens. Ved to- eller flerkredsbindfiltre skal kapacitets-dioderne i den netop ikke i indstillingen deltagende kreds ved hjælp af en 15 spænding kobles i gennemgangsretning.by means of an analog-to-digital converter 17 has been appropriately remodeled. The tuning voltages are individually changed continuously and from the microprocessor 13 over digital analog converters 18,19,20 applied to the individual circuits until the defined output criterion is found in the analogue digital converter 5 17. The digital analog converters are static monotonous converters. - tere, ie after data entry, they are separated from microprocessor 13 to avoid device interruptions and to retain the digital word until the tuning of another channel or until a fine tuning. This automatic tuning occurs at each new channel setting. Accordingly, an adjustment of the 10 circuits during the manufacture of the receiving apparatus may be omitted. With a simplified device, the extra oscillator can be adjustable at only a single frequency in the selected receiving channel, so that the optimum setting occurs only at this frequency. In the case of two- or multi-circuit connectors, the capacitance diodes in the circuit just not participating in the setting must be connected in a through direction by means of a voltage.

Ved modtagelse af en forskudt kanal eller nir der er taie om automatisk spgning, bliver dataordet for de enkelte dîgital-analog-omsættere trinvis ændret.Upon receipt of a staggered channel or no auto-tuning signal, the data word for each digital-to-analog converter is gradually changed.

I fig. 2 er vist frekvensafhængige UHF-gennemgangskur- 20 ver, som ait efter modtagefrekvens inden for et band har forskellige karakteristikker. Saledes er L/C-forholdet og diodegodheden dirlig ved lave frekvenser inden for et bând. Her bliver ekstraoscillatoren 15 indstillet pa kun én frekvens f . Ved midterfrekvenser inden for o blndet bliver ekstraoscillatoren skiftevis omskiftet til to frekvenser f^ 25 og f£, som ligger symmetrisk i forhold til en midterfrekvens i en afstand af 1 til 2 MHz.In FIG. 2, frequency dependent UHF transit curves are shown, which have different characteristics according to reception frequency within a band. Thus, the L / C ratio and diode goodness are low at low frequencies within a band. Here, the extra oscillator 15 is set to only one frequency f. At center frequencies within the blend, the extra oscillator is alternately switched to two frequencies f ^ 25 and f £ which are symmetrical to a center frequency at a distance of 1 to 2 MHz.

Ved h0je frekvenser i et band er L/C-forholdet samt diodegodheden god, og ekstraoscillatoren bliver skiftevis omskiftet til to frekvenser f3 og f^, som svarer til spidsfrekvenserne af gennem-30 gangskurven. I fig. 3 er vist grænserne for afstemningsspændings-omraderne. Det har til opnlelse af en maksimalt mulig HF-selektion vist sig hensigtsmæssigt, at de 0vre og nedre grænser for afstem-ningsspændingen for oscillatorkredsen ligger lavere end for HF-filter-kredsene, f.eks. for VHF-omradet ligger afstemningsspændingen for 35 oscillatorkredsen mellem 2 og 25 V (a) og for filterkredsene mellem 3 og =30 V (b), som vist i fig. 3.At high frequencies in a band, the L / C ratio as well as the diode goodness is good, and the extra oscillator is alternately switched to two frequencies f3 and f ^ which correspond to the peak frequencies of the through curve. In FIG. 3, the limits of the tuning voltage ranges are shown. In order to achieve a maximum possible HF selection, it has been found appropriate that the upper and lower limits of the tuning voltage for the oscillator circuit are lower than for the HF filter circuits, e.g. for the VHF range, the tuning voltage for the 35 oscillator circuit is between 2 and 25 V (a) and for the filter circuits between 3 and = 30 V (b), as shown in FIG. Third

Claims

1. Electronic tuning unit (tuner) for apparatus in the field of communication technology, in particular television and radio receiver apparatus, using a PLL system which, when tuning the receiver, sets the individual tuning circuits (3,4,5) according to each other. second at optimum values and assigns each tuning circuit to the set tuning values, characterized in that a tuner oscillator (9) is switched off each time by selecting a tuned receiving channel, and instead of 10 a single exclusively the entire receive frequency band oscillator ( 15) simulating the receive signals, connectable to the antenna input of the tuning unit (1), the high-frequency auxiliary oscillator (15) being alternately switchable to at least two frequencies in the desired receiving channel and at low frequencies to one frequency, and 15, there is a device (16) which demodulates the current RF signal and whose output voltage over an analog-to-digital converter (17) is applied to a microprocessor. rocessor (13), which, when establishing a maximum and symmetrical output curve in the HF area of DA converters (18,19,20), delivers the value of the tuning voltage of the 20 (3,4,5) in each tuning circuit capacitance diodes.

2. Tuning unit according to claim 1, characterized in that in the case of two- and multi-circuit connectors, the capacitance diode in the precisely non-tuning circuit participating circuit is biased in the through direction by a switching voltage.

Tuning unit according to claim 1, characterized in that the tuning of the HF circuits (3,4,5) is carried out by means of the extra oscillator (15) at only a single frequency per second. receive channel.

The tuning unit according to claim 1, characterized in that the PLL coupling (10-12) and the DA converters (18-20) are switched off from the microprocessor (13) after the setting process.

5. A tuning unit according to claim 1, characterized in that for the purpose of receiving a staggered channel or by automatic tuning, the defined data word for the individual DA converters 35 (18-20) and for the tuner oscillator (9) is incrementally variable.

A tuning unit according to claim 1, characterized in that the auxiliary oscillator (15) is controlled by the PLL coupling (10-12) already present in the tuning unit.

7. Tuning unit according to claim 1, characterized in that the tuning voltage range of the extra oscillator is lower than that of the HF filters to achieve the maximum possible HF viewing lesson. 10 15 20 25 30 <3 35