CN2174018Y - Colour TV set capable of receiving satellite TV signal - Google Patents

Abstract

The utility model relates to a multi-system type color TV capable of receiving satellite TV signals, which is provided with a host machine board of a multi-system type color TV, a switching power supply, a passage 1, a passage 2, a microprocessor 1, a microprocessor 2, a selection control circuit and a remote controller. When the utility model is used for receiving VHF and UHF TV signals, a power supply of a receiving circuit of a satellite television in the multi-system type color TV is automatically cut off by the control circuit; when people watch satellite television signals, a power supply of a VHF passage circuit and a power supply of a UHF passage circuit are automatically cut off. the utility model has the advantages of power consumption saving and interference reduction.

Description

Colour TV set capable of receiving satellite TV signal

The utility model relates to a kind of improved multi-modulation scheme color television set (annotating hereinafter to be referred as color television set is CTV).It also can receive L frequency range satellite TV signal except receiving the various standard TV signal of UHF, VHF frequency range.

At present, from spaceborne TV signal, carrier frequency formula in adopting, (3700～4200MHZ) transmit with the C band frequency.The satellite TV signal of L frequency range is obtained C band frequency conversion of signals by collection, amplification, frequency conversion by the satellite ground antenna system.This antenna system is made up of parabolic antenna, feed, tuner, feeder line.The TV colour signal of each channel coding standard has three kinds in this frequency range, comprises NTSC, PLA, Sequential Color and Memory system.The PLA-D system is adopted in the existing UHF of China, the broadcasting of VHF band tv, the TV signal of wanting to receive L, UHF, each frequency range of VHF has following three kinds of methods, they all will use satellite receiver, method one (seeing figure one) adopts the simulation standard converter, when watching the program of TSC-system formula, image is in a narrow margin.This is maximum method that adopts at present.Method two (figure two) adopts digital standard converter, watch effective, but cost height.Method three (seeing figure three) is without standard converter, and directly links to each other with satellite TV receiver with multi-modulation scheme CTV, and effect is also fine.Here the operation principle that need to prove standard converter and multi-modulation scheme demodulator circuit is different.Multi-modulation scheme CTV decoding and synchronous circuit have three kinds of working methods, are applicable to the TV signal of different systems respectively.For guaranteeing to separate the accurate of mediation synchronous circuit work, be provided with an automatic recognition control circuit of standard in the multi-modulation scheme color television set.And standard converter is that certain standard TV signal is converted to another standard TV signal, and obviously this is not a desirable method.

The purpose of this utility model provides a kind of improved multi-modulation scheme CTV.The function of its collection satellite TV receiver and multi-modulation scheme CTV mostly is one, uses a remote controller, realizes the preliminary election of each frequency range (L, U, V) program, and other function remote controls.

The utility model comprises motherboard, Switching Power Supply, passage 1 and microprocessor 1 among the existing multi-modulation scheme CTV.It is characterized in that also comprising: the microprocessor 2 that can receive remote signal and manual ringing, this microprocessor 2 and microprocessor 1 a shared infrared remote receiver; A L frequency range satellite television receive path 2 that is subjected to microprocessor 2 controls; One is subjected to difference input channel 1, the passage 2 of microprocessor 1 control, the vision signal that reaches external input circuit output, the selection control circuit of television audio signals.The vision signal of this circuit output is transported to synchronous scanning circuit and the video signal demodulation circuit in the motherboard; The audio signal of this circuit output is transported to the volume control circuit of motherboard; This circuit also is respectively passage 1 and passage 2 provides power supply.

The utlity model has simplified equipment, cost is low, user installation is easy to use advantage.

Fig. 1 is the reception satellite TV signal schematic representation of apparatus of existing employing simulation standard converter.

Fig. 2 is the device schematic diagram that the digital standard converter of existing employing receives satellite TV signal.

Fig. 3 is the existing device schematic diagram that adopts the reception satellite TV signal of multi-modulation scheme CTV.

Fig. 4 is a circuit block diagram of the present utility model.

Fig. 5 is the circuit theory diagrams of the utility model microprocessor 2 and passage 2.

Fig. 6 is the block diagram of selection control circuit of the present utility model.

Fig. 7 is the circuit diagram of selection control circuit of the present utility model.

Fig. 8 is the circuit block diagram of passage 2.

Fig. 9 is an infrared remote receiver circuit of the present utility model.

Below in conjunction with accompanying drawing the utility model is described in detail.

For convenience of explanation, at first introduce the symbol of Fig. 5,7,9, middle element and part:

R-resistance; The VR-potentiometer; The C-capacitor; The L-inductance; The D-semiconductor diode; The BG-transistor; The IC-integrated circuit; The K-touch-switch; The in line row connector of CK-; The CZ-coaxial socket; The G-quartz (controlled) oscillator; The J-relay; The T-high-frequency tuner.

The first numeral of the sequence number of each several part components and parts is respectively 5,7,9 among Fig. 5,7,9.For example R501 is a resistance among Fig. 5.C701 is the electric capacity among Fig. 7, and D901 is the diode among Fig. 9.

In Fig. 4, the utility model comprises existing multi-modulation scheme CTV motherboard, microprocessor 1, passage 1 and Switching Power Supply.Foregoing circuit connects by original mode.Its inventive point is to have increased by 2, one passages 2 of a microprocessor and a selection control circuit.The INT input of microprocessor 2 is connected with the infrared remote receiver output.Passage 2 tuner antenna inputs are connected with feeder line with satellite antenna system, its video circuit signal output part, audio frequency audio signal output select one road input of control circuit to be connected with one road input, the sound accompaniment of the video circuit of selecting control circuit respectively, equally, the VT of passage 1 selects another road input of control circuit to be connected with another road input of selecting control circuit, sound accompaniment respectively with audio frequency audio signal output, and the output of external input circuit also is connected with selecting the control circuit mouth.The connection of this three road input signal is one to one, and the power supply power supply in the selection control circuit selects circuit to be respectively passage 1 and passage 2 provides power supply.Select the control end of control circuit to be connected with AV1, the AV2 end of microprocessor 1.Therefore select control circuit to be subjected to the control of microprocessor 1.Select the control circuit VT to be connected, select the control circuit audio signal output end to be connected with the audio volume control circuit with synchronous scanning, the video signal demodulation circuit input of motherboard.

The effect of microprocessor 2 is by receiving channel preselection, memory and the selection to passage 2 of remote signal and manual control signal.The effect of passage 2 is that the satellite-signal demodulation with the L frequency range converts vision signal and audio frequency audio signal to.Passage 2 can have multiple embodiments, and Fig. 5 is only just wherein a kind of.Microprocessor 2 is by little processing integrated circuit IC501 MC68HC05 with have crystal oscillating circuit, EEPROM electrically-erasable memory, D/A converter, data input, output interface integrated circuit (IC) 502 MC44802 and button and digital display circuit is formed in Fig. 5.Microprocessor 2 provides tuning voltage for the T501 in the passage 2, channel digit signal by microprocessor 2 preliminary elections is exported corresponding pulse signal by the 1st pin of IC502, forms the paraphase smoothed filter circuit via C501, R505, C511, R506, C512 composition smoothing filter and BG501, R502, R503, C505, R504, C509 and becomes 3rd pin of galvanic current force feed to T501.Passage 2 mainly is made up of tuner T501 and thick film integrated circuit IC503-LD398C and peripheral circuit.T501 becomes a fixed intermediate frequency signal to export at the 8th pin high-frequency TV signal SL amplification, the frequency conversion of antenna terminal input, after IC503 amplifies demodulation with this medium-frequency TV signal, and the 8th pin output video TV signal, the 2nd pin output television audio signals.

Among Fig. 5, CK501 is the remote-controled digital signal input part from infrared remote receiver; CK502 is the microprocessor work power input, and CK503 is row, field pulse input; CK504 is passage 2 VT; CK505 is passage 2 audio signal outputs; CK506 is+the B2 power input; CK507 is the 30V power input; CK508 is that EEPROM writes power input; CK501 links to each other with infrared remote receiver; CK502 links to each other with remote circuit; CK503 is capable with motherboard, field-scanning circuit links to each other; CK504 links to each other with the CK702 that selects control circuit; CK505 links to each other with the CK706 that selects control circuit, and CK505 links to each other with the CK704 that selects control circuit; CK507 links to each other with the motherboard scanning power supply; Video1, Video2, Video3 represent the vision signal of passage 1, passage 2, the output of external input circuit respectively in Fig. 6; Audio1, Audio2, Audio3 represent the sound accompaniment audio signal of passage 1, passage 2, the output of external input circuit respectively.Every road Audio has left and right acoustic channels.+ B1 ,+B2 is expressed as the power supply that passage 1, passage 2 provide respectively.Select control circuit to select circuit, sound accompaniment to select control circuit and power supply to select supply circuit to form by video.They are subjected to the control of microprocessor 1, selecting which TV signal TV, audio signal, and which passage to provide power supply for.Video0 and Audio0 are for selecting the output signal of control circuit.

Fig. 7 is the circuit diagram of selection control circuit of the present utility model.It is to select control circuit by vision signal, television audio signals selection control circuit and three compositions of power selection circuit.This circuit has three groups of signal input parts and one group of output.Three groups of input signals are respectively from passage 1, passage 2 and external input circuit, and the output signal of this circuit is subjected to the control of microprocessor 1, and the video tv signal of output is delivered to the synchronous scanning circuit and the video tv signal demodulator circuit of motherboard; The audio frequency television audio signals of output is delivered to motherboard audio frequency low discharging circuit, and power selection circuit control two-way power supply is when receive path 1 signal, automatically cut off passage 2 power supplys, connect the power supply of passage 1, when 2 signals of receive path, automatically cut off the power supply of passage 1, connect the power supply of passage 2.

In Fig. 7, CK701 is the vision signal input socket of passage 1; CK702 is the vision signal input socket of passage 2; CK703 is the vision signal accessory power outlet, it with motherboard in synchronous scanning be connected with video signal demodulation circuit; CK704 is supply socket, CK705 is the television audio signals input socket of passage 1, CK702 is passage 2 television audio signals input sockets, CK707 is the control signal input socket of microprocessor 1, CK708 is the television audio signals accessory power outlet, and it is connected with audio volume control circuit in the motherboard; CZ701 is external vision signal input socket, and CZ702 is external vision signal accessory power outlet, and CZ703 is external right channel audio signal input socket; CZ704 is external L channel companion subcutaneous ulcer signal input socket, and CZ705 is external right channel audio signal accessory power outlet, and CZ706 is external L channel sound accompaniment accessory power outlet.

Select the switching circuit of control circuit to be made up of two analog switching ics, the integrated circuit model is CD4052, has 2 group four to select 1 switch in each slice, thin piece, the left and right acoustic channels of three road television audio signals two groups of switches of IC702.Three tunnel vision signals 1 group of switch of IC701, power supply are selected supply circuit another group switch of IC701.

Video selects control circuit to form by one group of switch of IC701 with by the secondary emitter follower circuit that BG704, BG705 constitute.Vision signal by CK701, CK702, input is selected the control switch input by the vision signal that C703, C704 receive IC701.Also deliver to video selection control switch input by the vision signal of CZ703 input through the frequency compensated circuit formed by R701, R702, R703, C701 with by the emitter follower that C701, R704, R705, R706, BG701 form.Select the vision signal of output, be divided into two the tunnel when forming emitter follower by BG704.One the tunnel delivers to CK703; One the tunnel penetrates through the second level with the BG705 emitter of circuit and capacitor C 708, R725, R726 and delivers to CZ702.

Circuit is selected in the power supply power supply, forms by another group switch of IC701 with by drive circuit and relay J 701 that BG702, BG703 constitute.This group switch corresponding input end at IC701 connects high level.Output at this group switch is succeeded electrical apparatus driving circuit, and drive circuit is made up of R714, R715, R716, BG702, BG703, R717, R718, D701, and the coil of relay J is connected in the collector loop of BG703.

Sound accompaniment selects control circuit to be made up of the two groups of switches of IC702 and the emitter follower that mainly is made of BG707, BG708.Deliver to two inputs of two groups of switch correspondences respectively through C709, C710 by the audio frequency left and right acoustic channels of CK705 input; Another that deliver to two groups of switches respectively through C711, C712 by the audio signal left and right acoustic channels of CK706 input organized corresponding input, by the left and right acoustic channels audio signal of CZ703, the input of CZ704 socket, deliver to the 3rd group of input of two groups of switch correspondences respectively through R727, C713, R729, C714; The emitter follower of selecting the R channel audio signal of output to form via BG707 by IC702 is transported to the R channel terminal of CK708, CZ705; The emitter follower of selecting the L channel audio signal of output to form via BG708 by IC702 is delivered to the L sound channel terminal of CK708, CZ706.The signal of CK707 input joins with IC701, IC702 control end.

When CK707 input control signal selector channel 1, the 3rd, 4 pin of IC701, IC702, the 11st, 13 pin are connected.Relay drive circuit ends, the coil no current in the relay J 701, and JK701 connects, and+B1 is switched to passage 1 circuit.And the JK702 open circuit, the power supply+B2 of passage 2 is cut off.Passage 1 is accepted VHF, UHF channel section TV signal.The vision signal of passage 1 output, through CK701, C703, C707 and penetrating with circuit, deliver to motherboard by the BG707 group by CK707, form through C709, C719 with by BG707 respectively simultaneously and penetrate with circuit, C710, C717 and form emitter follower by BG708 and all receive CK708, finally receive the sound accompaniment low discharging circuit of motherboard by the audio signal of CK705 input.

In like manner, when CK707 input control signal selector channel 2, the 2nd, 3 pin of IC701, IC702, the 13rd, 15 pin are connected, the relay drive circuit conducting has attract current in the relay J 701, the JK701 open circuit, + B1 power supply is cut off, the JK702 closure, and+B2 power supply is received passage 2.Passage 2 receives L section satellite-signal.The output signal of passage 2 is delivered to motherboard through selecting control circuit simultaneously.

Owing to adopted power supply to select power supply circuits, not only reduced power consumption, also avoided the interference between passage 1 and the passage.

Among Fig. 9, the dotted line left side is general infrared receiving circuit, and the right is a buffer amplifier circuit.It becomes two tunnel outputs with one tunnel output.CK901 is+the 5V power input.CK902, CK903 are the output of infrared remote receiver, are connected respectively to the remote signal input of little processing 1 and microprocessor 2.

Send BG901 to be amplified in signal on the R906 through R707 by the remote signal of IC901 the 7th pin output through R904 through the paraphase shaping, deliver to BG902 and BG903 paraphase shaping respectively with R708 and amplify respectively, close INT end to microprocessor 1 and microprocessor 2 by CK902 and CK903 output.

Claims (3)

1, a kind of machine of looking that can receive the multi-modulation scheme colour of satellite electric signal, comprise existing multi-modulation scheme CTV motherboard, Switching Power Supply, passage 1 and microprocessor 1, it is characterized in that also comprising: the microprocessor 2 that can receive remote signal and manual ringing, this microprocessor 2 and microprocessor 1 a shared infrared remote receiver; A L frequency range satellite television receive path 2 that is subjected to microprocessor 2 controls; A selection control circuit that is subjected to microprocessor 1 control; The input of this circuit is input channel 1 respectively, vision signal, the television audio signals of passage 2 and the output of external input circuit; The vision signal of the output signal of this circuit is delivered to synchronous scanning circuit and the video signal demodulation circuit in the motherboard; The audio signal of this circuit output is delivered to the volume control circuit of motherboard; This circuit also is respectively passage 1 and passage 2 provides power supply.

2, multi-modulation scheme color television set according to claim 1 is characterized in that selecting control circuit to select control circuit, audio signal to select control circuit and power selection circuit to form by vision signal; This circuit has one group of output signal of three groups of input signals and three groups of input signals respectively from passage 1, passage 2 and external input circuit, and output signal is subjected to microprocessor 1 control, and the video tv signal of output send motherboard synchronous scanning circuit video demodulator circuit; The audio frequency television audio signals of output is delivered to the audio frequency low discharging circuit; Circuit control two-way power supply is selected in the power supply power supply, when receive path 1 signal, cuts off the power supply of passage 2 automatically, and connects the power supply of passage 1; The power supply in the open close road 1 of automatic event when the signal of receive path 2, and the power supply of connection passage 2.

3, color television set according to claim 1 is characterized in that the shared infrared receiving diode of infrared receiving circuit and an amplifier, adds the INT input that No. two buffer amplifiers are delivered to two microprocessors respectively at the output of amplifier.

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