DK164624B - Reception apparatus for reception of television transmissions transmitted by cable with a gate circuit - Google Patents
Reception apparatus for reception of television transmissions transmitted by cable with a gate circuit Download PDFInfo
- Publication number
- DK164624B DK164624B DK529386A DK529386A DK164624B DK 164624 B DK164624 B DK 164624B DK 529386 A DK529386 A DK 529386A DK 529386 A DK529386 A DK 529386A DK 164624 B DK164624 B DK 164624B
- Authority
- DK
- Denmark
- Prior art keywords
- reception
- gate circuit
- cable
- circuit
- signal
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/08—Separation of synchronising signals from picture signals
- H04N5/10—Separation of line synchronising signal from frame synchronising signal or vice versa
-
- 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
Description
iin
DK 164624 BDK 164624 B
Den foreliggende opfindelse angår et modtageapparat til modtagelse af ved hjaelp af kabel overførte fjernsynsudsendelser med et portkredsløb til undgåelse af modtagelse af fremmede radiotjenester, hvor portkredsløbet er anbragt i modtageapparatets lydkanal, med en 5 billed-MF-demodulator og et til denne koblet impulsskilletrin for modtagesignalets 1iniesynkroniseringssignaler.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver apparatus for receiving television transmitted by cable with a gate circuit for avoiding reception of foreign radio services, wherein the gate circuit is located in the audio channel of the receiving apparatus, with 1iniesynkroniseringssignaler.
Som bekendt findes der ved frekvenserne for kabel fjernsyn også kanaler, som ved trådløs udsendelse er tildelt fremmede radiotjenester, som f.eks. politiradio osv.As is well known, at the frequencies of cable television, there are also channels that are wirelessly assigned to foreign radio services, such as the police radio, etc.
10 Det er kendt at gøre sådanne radiotjenester ikke-hørbare ved, at lydkanalen ved modtagelse af et sendesignal, som ikke svarer til fjernsynsnormen, bliver styret tavs. Dette sker på kendt måde ved, at lydkanalen kun bliver gennemkoblet ved konstatering af koincidens af de modtagne liniesynkroniseringsimpulser og de af modtageappara-15 tet frembragte liniefrekvente impulser. Derved undgås, at de fremmede radiotjenester er hørbare (DE patentskrift 25 13 344). Dette kredsløb arbejder pålideligt, når et modtageapparat kun er indrettet til HF-modtagesignaler. Der findes imidlertid apparater, som ikke udelukkende tjener til modtagelse af HF-signaler. Ved hjælp af en 20 særlig indgang på fjernsynsmodtageapparatet er det muligt at tilslutte f.eks. spil, datamat, videotuner, videobåndoptager, hvis FBAS-signal over en omskifter kan tilsluttes video- og synkroniseringstrinnene med fasesammenligning og koincidens. Disse periferiapparater udgør pseudofjernsynssendere, som lyd-tavskredsløbet 25 reagerer på, dvs. ved tilstedeværelsen af et signal fra det tilsluttede apparat bliver lydkanalen gennemkoblet, også når fjernsynsmodtageren er afstemt til frekvensen for en fremmed radiotjeneste. Dette svarer imidlertid ikke til forskrifterne, som siger, at lyden for en sådan tjeneste i hvert tilfælde skal forblive 30 ikke-hørbar.10 It is known to make such radio services inaudible by the silence of the sound channel upon receipt of a broadcast signal which does not conform to the television norm. This is done in known manner in that the sound channel is only switched on by ascertaining the coincidence of the received line synchronization pulses and the line frequency pulses produced by the receiving device. This prevents the foreign radio services from being audible (DE patent 25 13 344). This circuit operates reliably when a receiving device is designed for RF reception signals only. However, there are devices which do not exclusively serve to receive RF signals. By means of a special input on the television receiver, it is possible to connect e.g. games, computer, video tuner, VCR, whose FBAS signal over a switch can be connected to the video and synchronization steps with phase comparison and coincidence. These peripherals constitute pseudo-television transmitters to which the silent circuit 25 responds, i.e. in the presence of a signal from the connected device, the audio channel is transmitted, even when the television receiver is tuned to the frequency of a foreign radio service. However, this does not correspond to the regulations which say that in any case the sound of such a service must remain 30 inaudible.
Formålet med den foreliggende opfindelse er også i tilfælde af tilslutning af periferi apparater på simpel måde at opfylde de nævnte forskrifter. Ifølge opfindelsen opnås dette ved at udforme modtage-apparatet som angivet i krav l's kendetegnende del.The object of the present invention is also in the case of connecting peripheral devices in a simple manner to comply with the above mentioned requirements. According to the invention this is achieved by designing the receiving apparatus as set forth in the characterizing part of claim 1.
35 Opfindelsen skal herefter forklares nærmere under henvisning til tegningen, hvor fig. 1 viser et blokdiagram over en udførelsesform for apparatet ifølge opfindelsen og fig. 2 anordningen i fig. 1 som et eksempel på et diskret 2The invention will now be explained in more detail with reference to the drawing, in which fig. 1 is a block diagram of one embodiment of the apparatus according to the invention; and FIG. 2 shows the device of FIG. 1 as an example of a discrete 2
DK 164624 BDK 164624 B
kredsløb.orbit.
Et af en antenne 1 modtaget HF-signal føres til en tuner 2 og derfra til et MF-trin 3, hvorfra lydkanalen og videokanalen afgre-nes. Over et lyd-MF-trin 4 føres lydsignalet over et portkredsløb 5 5 til en udenfor førende kontakt 6 i en stikdåse 7 for tilslutning f.eks. af en hovedtelefon samt til en kontakt i en omskifter 8, hvis anden kontakt er forbundet med en indgangstilslutning 9, hvorfra lydsignalerne kan omskiftes til lydtrinnet 10 i modtageren. Fra MF-trinnet 3 føres videosignalet til en udenfor førende kontakt 11 10 og til en kontakt i en yderligere omskifter 12, hvis anden kontakt er forbundet med en indgangstilslutning 13. Indgangs- og udgangstilslutningerne 9, 13 og 6,11 tjener til forbindelse af modtageap-paratet med periferi apparaterne. Omskifteren 12 er forbundet med videosignaltrinnene 14 og de til afbøjning af elektronstrålerne i 15 billedgengiverøret tjenende kredsløb 15. Styresignalet til påvirkning af portkredsløbet 5 bliver udtaget fra MF-signalet og behandlet i et trin 16, som skal beskrives nærmere i forbindelse med fig. 2.An RF signal received by an antenna 1 is fed to a tuner 2 and thence to an MF stage 3 from which the audio channel and video channel are determined. Over an audio MF step 4, the audio signal is passed over a gate circuit 5 5 to an outside conductor 6 in a socket 7 for connection e.g. of a headphone as well as to a switch in a switch 8, the second switch of which is connected to an input terminal 9, from which the audio signals can be switched to the sound stage 10 in the receiver. From the MF stage 3, the video signal is passed to an outside conductor switch 11 10 and to a switch in a further switch 12, the other contact of which is connected to an input terminal 13. The input and output terminals 9, 13 and 6,11 serve to connect the receive aperture - the device with the peripherals. The switch 12 is connected to the video signal stages 14 and the deflection of the electron beams in the 15 image reproduction tube 15. The control signal for influencing the gate circuit 5 is taken out of the MF signal and processed in a step 16 to be described in more detail in connection with FIG. 2nd
Først føres FBAS-signalet over et impulsskilletrin 17 til et til linieimpulsfrekvensen afstemt filterkredsløb 18, der i det viste 20 eksempel er vist som dobbelt T-RC-filter. Også ethvert andet selektionskredsløb er muligt, som f.eks. en LC-svingningskreds, der imidlertid ikke er så omkostningsgunstig som et RC-netværk. Også magnetiske spredningsfænomener kan påvirke virkemåden af tavs-styrekredsløbet uheldigt. Et til filterkredsløbet 18 sluttet skif-25 tetrin 19 med hysteresekarakteristik frembringer kun ved tilstedeværelsen af periodisk optrædende impulser i et smalt akcepterbart frekvensområde på udgangen 20 af skiftetrinnet 19 et signal, som tjener til styring af portkredsløbet 5.First, the FBAS signal is passed over a pulse separator step 17 to a line pulse frequency 18 tuned to the line pulse frequency, shown in the example 20 shown as a dual T-RC filter. Also, any other selection circuit is possible, such as. an LC oscillation circuit, however, which is not as cost-effective as an RC network. Also, magnetic scattering phenomena can adversely affect the operation of the silent control circuit. A switching step 19 of hysteresis characteristic connected to the filter circuit 18 produces only a signal which serves to control the gate circuit 5 in the presence of periodically occurring pulses in a narrowly acceptable frequency range at the output 20 of the switching stage 19.
30 3530 35
Claims (4)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3508527 | 1985-03-09 | ||
DE19853508527 DE3508527A1 (en) | 1985-03-09 | 1985-03-09 | RECEIVER FOR RECEIVING TELEVISION BROADCASTING WITH A CABLE |
PCT/EP1986/000057 WO1986005347A1 (en) | 1985-03-09 | 1986-02-03 | Receiver for television broadcasts by cable with a gate circuit |
EP8600057 | 1986-02-03 |
Publications (4)
Publication Number | Publication Date |
---|---|
DK529386A DK529386A (en) | 1986-11-05 |
DK529386D0 DK529386D0 (en) | 1986-11-05 |
DK164624B true DK164624B (en) | 1992-07-20 |
DK164624C DK164624C (en) | 1992-12-14 |
Family
ID=6264776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK529386A DK164624C (en) | 1985-03-09 | 1986-11-05 | RECEIVER APPLICATION TO RECEIVE USE OF CABLE TRANSMISSION TELEVISION TRANSMISSIONS WITH A PORT CIRCUIT |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0216797B1 (en) |
JP (1) | JPH0810929B2 (en) |
CN (1) | CN86101214B (en) |
DE (2) | DE3508527A1 (en) |
DK (1) | DK164624C (en) |
WO (1) | WO1986005347A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3634698C2 (en) * | 1986-10-11 | 1996-01-11 | Thomson Brandt Gmbh | Television receiver |
DE4110293A1 (en) * | 1991-03-28 | 1992-10-01 | Loewe Opta Gmbh | TELEVISION RECEIVER |
SE9503241D0 (en) * | 1995-09-26 | 1995-09-26 | Tetra Laval Holdings & Finance | plate heat exchangers |
GB2307606A (en) * | 1995-11-23 | 1997-05-28 | Thomson Multimedia Sa | Muting in a microprocessor-controlled audio apparatus |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE509945A (en) * | 1951-03-16 | |||
US3743774A (en) * | 1971-07-12 | 1973-07-03 | Magnavox Co | Synchronizing signal separation circuit |
US3935534A (en) * | 1972-11-15 | 1976-01-27 | Columbia Pictures Industries, Inc. | Converter-tuner for information transmission system |
JPS4990038A (en) * | 1972-12-27 | 1974-08-28 | ||
DE2513344C3 (en) * | 1975-03-26 | 1983-01-13 | Blaupunkt-Werke Gmbh, 3200 Hildesheim | Television receivers, in particular for receiving television programs transmitted by cable, with a gate circuit |
FR2484752A1 (en) * | 1980-06-13 | 1981-12-18 | Thomson Brandt | SOUND STOP DEVICE FOR TELEVISION, AND TELEVISION COMPRISING SUCH A DEVICE |
JPS57208773A (en) * | 1981-06-18 | 1982-12-21 | Mitsubishi Electric Corp | Television receiver |
-
1985
- 1985-03-09 DE DE19853508527 patent/DE3508527A1/en not_active Withdrawn
-
1986
- 1986-02-03 WO PCT/EP1986/000057 patent/WO1986005347A1/en active IP Right Grant
- 1986-02-03 EP EP86901071A patent/EP0216797B1/en not_active Expired - Lifetime
- 1986-02-03 DE DE8686901071T patent/DE3672428D1/en not_active Expired - Fee Related
- 1986-02-26 CN CN86101214A patent/CN86101214B/en not_active Expired
- 1986-03-10 JP JP61050733A patent/JPH0810929B2/en not_active Expired - Lifetime
- 1986-11-05 DK DK529386A patent/DK164624C/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DK529386A (en) | 1986-11-05 |
DK164624C (en) | 1992-12-14 |
EP0216797A1 (en) | 1987-04-08 |
JPS62187A (en) | 1987-01-06 |
CN86101214A (en) | 1986-10-08 |
DE3672428D1 (en) | 1990-08-09 |
CN86101214B (en) | 1988-12-28 |
WO1986005347A1 (en) | 1986-09-12 |
EP0216797B1 (en) | 1990-07-04 |
JPH0810929B2 (en) | 1996-01-31 |
DK529386D0 (en) | 1986-11-05 |
DE3508527A1 (en) | 1986-09-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PBP | Patent lapsed |