CN2357451Y - Picture character TV Receiving decoder - Google Patents

Abstract

The utility model relates to a picture and character television receiving decoder, which solves the disadvantage that a common television can not receive Chinese picture and character information simultaneously without damaging on the common television receiving television programs. The utility model has the advantages of low cost, strong versatility, etc. As for the receiving effect, the error code rate of the utility model is lower than that of former designed products, picture and character information with 200 pages can be memorized via a memory, and thus the speed of receiving the television programs is high.

Description

Teletext receives decoding device

The utility model belongs to the signal processing apparatus of television set, is specifically related to the device that the Chinese facsimile signal of TV signal is selected and handled.

All general television sets before the utility model is made all can't receive Chinese facsimile signal.The teletext machine of foreign country only can receive the information of western language.Because Chinese text can not directly be applied mechanically original circuit arrangement than the character complexity of western language literal.Want to see that picture and text information can only pass through picture and text microcomputer card, receive on the microcomputer and watch that this method complicated operation, error rate height, cost height, and be subjected to the influence of hardware device be not if having the plan machine then can not watch.

Provide a kind of teletext with low cost that both can watch graph text information in the general television set that can directly be installed in to receive decoding device for overcoming the problems referred to above the utility model.

The utility model is achieved in that a kind of figure side television reception decoding device, can make card shape, shaped like chips or circuit shape, and its inventive point is mainly on circuit; The vision signal that television main is sent arrives the decoding core circuit through emitter follower; Row field signal makes the anchor point of this signal deliver to the decoding core circuit after within the adjustable extent through space field pulse shaping circuit; Remote control signal reception arrives cpu control circuit, and this signal is delivered to TV SKD by cpu control circuit simultaneously, and cpu control circuit passes through I ²The C bus is connected with decoding core circuit SDA, SCL, and cpu control circuit is also to decoding core circuit output reset signal; Rgb signal after the decoding core circuit is handled selects to be transported to television main through the alternative electronic switch, with decision output facsimile signal or TV signal; The selecting side of alternative electronic switch is connected with the output of cpu control circuit and is used for controlling either-or switch.

Described teletext receives decoding device, and the decoding core circuit that this teletext receives decoding device is made of integrated SAA5700GP, memory KM44C1000D, character library GB5007T, address latch 74F573N; The VSSA ground connection of a wherein integrated SAA5700GP; IREF, STN, REF, BJACK are by resistance, capacity earth; VDDA end connection+5v power supply, its OSCIN is connected crystal oscillating circuit with the OSCOUT end, and the CVBS termination is received the vision signal that television main is sent, and TEST1, TEST2, VSS1 hold ground connection, VDD1, VDDX end connects+the 5v power supply simultaneously by capacity earth, LFB end and FFB termination row field signal; The WE of integrated SAA5700GP, RAS, CAS end are connected with WE, RAS, the CAS end of memory KM44C1000D; The RD0 of integrated SAA5700GP～RD7 end is connected with D0～D7 of character library GB5007T, and RD0～RD3 end is connected with the D0～D3 of KM44C1000D memory simultaneously; The RA0 of integrated SAA5700GP～RA9 end is connected with the A0～A9 end of KM44C1000D memory, and its RA2～RA9 end is connected with 2 ends～9 ends of address latch 74F573N simultaneously; The A of 12 ends of address latch 71F573N～19 ends and character library GB5007T ₂, A ₁₀, A ₁₁, A ₉, A ₈, A ₁₃, A ₁₄, A ₁₇Connect; The E end of character library GB5007T and VSS end common ground; The VSS end ground connection of memory KM44C1000D, vdd terminal connection+5V power supply; The EN of address latch 74F573N end and GND end are distinguished ground connection, and VCC is connected with+5v power supply; The ROMCS end of the C1 end of address latch 74F573N, the C/VPP end of character library GB5007T, integrated SAA5700GP is connected to each other; The BLUE of integrated SAA5700GP, GREEN, RED hold outside output signal.

Described teletext receives decoding device, the cpu control circuit of this device is that the RESET of single chip computer AT 89C1051 holds by resistance and diode ground connection, connect+the 5v power supply through electric capacity simultaneously, X1 is connected simultaneously through electric capacity difference ground connection by crystal Z1202 with the X2 end, GND holds ground connection, VCC termination+5v power supply; The P1.2 end of single chip computer AT 89C1051 is connected the reception remote controller signal with the INTO end; The P1.3 end output control signal of single chip computer AT 89C1051, the P1.7 end is connected with the RESET end with integrated SAA5700GP, the P1.6 end is connected with the BLAN end of integrated SAA5700GP, and the P1.5 end is connected with the SDA end with the SCL of integrated SAA5700GP respectively with the P1.4 end.

Advantage of the present utility model and actively the handing-over effect be: this device has solved the drawback that general television set can't be watched Chinese graph text information not damaging when general television set is watched ordinary tv programme.And it is low to have cost, advantages such as highly versatile.It is low to design the product error rate than before with regard to its reception, has adopted memory can store 200 pages of graph text informations simultaneously, makes to watch that speed is fast.

Be described in further details this usefulness is novel below in conjunction with accompanying drawing.

Fig. 1 is the circuit block diagram that the utility model is implemented.

Fig. 2 is a circuit diagram of the present utility model.

Embodiment:

A kind of figure side television reception decoding device can make card shape, shaped like chips or circuit shape, and its inventive point is mainly on circuit; The vision signal that television main is sent arrives the decoding core circuit through emitter follower; Row field signal makes the anchor point of this signal deliver to the decoding core circuit after within the adjustable extent through space field pulse shaping circuit; Remote control signal reception arrives cpu control circuit, and this signal is delivered to TV SKD by cpu control circuit simultaneously, and cpu control circuit passes through I ²The C bus is connected with decoding core circuit SDA, SCL.Cpu control circuit is also to decoding core circuit output reset signal; Rgb signal after the decoding core circuit is handled selects to be transported to television main through the alternative electronic switch, with decision output map square signal or TV signal; The selecting side of alternative electronic switch is connected with the output of cpu control circuit and is used for controlling either-or switch.The decoding core circuit that this teletext receives decoding device is made of integrated SAA5700GP, memory KM44C1000D, character library GB5007T, address latch 74F573N.The VSSA end ground connection of a wherein integrated SAA5700GP; IREF end by resistance R 1202, STN end by capacitor C 1206, REF end by capacitor C 1206, BLACK end by capacitor C 1208 ground connection VDDA end connect by behind capacitor C 1209 and inductance L 1204 filter rectifications+the 5v power supply, its OSCIN is connected crystal oscillating circuit with the OSCOUT end, TEST1, TEST2, VSS1 hold ground connection, the connection passing through of VDD1, VDDX end capacitor C 1210 and C1212 filtering+the 5v power supply, LFB end and FFB termination row field signal make the signal of anchor point within adjustable extent of this signal through space field pulse shaping circuit; The E end of character library GB5007T and VSS end common ground; Memory KM44C1000D is its VSS end ground connection of DRAM of IM * 4, vdd terminal connection+5V power supply; The EN of address latch 74F573N end and GND end be ground connection respectively, behind VCC end and process capacitor C 1214 and inductance L 1202 filter rectifications+the 5v power supply is connected; The ROMCS end of the C1 end of address latch 74F573N, the C/VPP end of character library GB5007T, integrated SAA5700GP is connected to each other; The CVBS termination of integrated SAA5700GP is received television main and is sent through penetrating the vision signal VEDIO of grade follower; The WE of integrated SAA5700GP, RAS, CAS end are connected with WE, RAS, the CAS end of memory KM44C1000D; The RD0 of integrated SAA5700GP～RD7 end is connected with D0～D7 of character library GB5007T, and RD0～RD3 end is connected with the D0～D3 of KM44C1000D memory simultaneously; The RA0 of integrated SAA5700GP～RA9 end is connected with the A0～A9 end of KM44C1000D memory, and its RA2～RA9 end is connected with 2 ends～9 ends of address latch 74F573N simultaneously; The A of 12 ends of address latch 74F573N～19 ends and character library GB5007T ₂, A ₁₀, A ₁₁, A ₉, A ₈, A ₁₃, A ₁₄, A ₁₇Connect.The BLUE of integrated SAA5700GP, GREEN, RED end connect the alternative electronic switch, and the alternative electronic switch is outwards exported facsimile signal through resistance R 1258, R1257, R1256 outgoing television signal or process resistance R 1260, R1261, R1262 respectively; The selection utmost point process of while alternative electronic switch is that the routine circuitry phase of main body is connected with the BLAN end of integrated SAA5700GP with the BLK of TV signal or through diode VD1205, diode VD1206, resistance R 1208 by triode V1205.The cpu control circuit of teletext machine receiving system is that the RESET end of single chip computer AT 89C1051 passes through resistance R 1248 or diode VD1202 ground connection, connect+the 5v power supply through capacitor C 1223 simultaneously, X1 is connected simultaneously respectively by capacitor C 1219, C1220 ground connection by crystal Z1202 with the X2 end, GND holds ground connection, behind VCC end process capacitor C 1214 and inductance L 1202 filter rectifications+the 5v power supply; P1.2 end and the INT0 of single chip computer AT 89C1051 receives remote controller signal through diode VD1201 after holding and being connected; The P1.3 end of single chip computer AT 89C1051 is defeated exports control signal through diode VD1204 and resistance R 1264, R1263 to television set CPU, the P1.7 end is connected with the RESET end with integrated SAA5700GP, the P1.6 end is connected with the BLAN end of integrated SAA5700GP with resistance R 1208 through diode VD1207, and the P1.5 end is connected with the SDA end with the SCL of integrated SAA5700GP by pull-up resistor R1239, R1238 respectively with the P1.4 end.When remote controller signal arrives P1.2 end and INO during use, hold among the CPU that sends back to again on the TV SKD by P1.3; If simultaneously single-chip microcomputer is through decoding, judge whether suffered remote signal is used to control the picture and text reception and then delivers to integrated SAA5700GP by bus, if not Signal Fail then.Integrated SAA5700GP be subjected to television main send through behind the vision signal VEDIO that penetrating grade follower through computing, by multiplex bus process character library, address latch, storage, send integrated SAA5700GP back to, select output through the alternative electronic switch again.

Claims (3)

1, a kind of teletext receives decoding device, it is characterized in that; The vision signal that television main is sent arrives the decoding core circuit through emitter follower; Row field signal makes the anchor point of this signal deliver to the decoding core circuit after within the adjustable extent through space field pulse shaping circuit; Remote control signal reception arrives cpu control circuit, and this signal is delivered to TV SKD by cpu control circuit simultaneously, and cpu control circuit passes through I ²The C bus is connected with decoding core circuit SDA, SCL, and cpu control circuit is also to decoding core circuit output reset signal; Rgb signal after the decoding core circuit is handled selects to be transported to television main through the alternative electronic switch, with decision output facsimile signal or TV signal; The selecting side of alternative electronic switch is connected with the output of cpu control circuit and is used for controlling either-or switch.

2, teletext according to claim 1 receives decoding device, it is characterized in that: the decoding core circuit that this teletext receives decoding device is made of integrated SAA5700GP, memory KM44C1000D, character library GB5007T, address latch 74F573N; The VSSA ground connection of a wherein integrated SAA5700GP; IREF, STN, REF, BJACK are by resistance, capacity earth; VDDA end connection+5v power supply, its OSCIN is connected crystal oscillating circuit with the OSCOUT end, and the CVBS termination is received the vision signal that television main is sent, and TEST1, TEST2, VSS1 hold ground connection, VDD1, VDDX end connects+the 5v power supply simultaneously by capacity earth, LFB end and FFB termination row field signal; The WE of integrated SAA5700GP, RAS, CAS end are connected with WE, RAS, the CAS end of memory KM44C1000D; The RD0 of integrated SAA5700GP～RD7 end is connected with D0～D7 of character library GB5007T, and RD0～RD3 end is connected with the D0～D3 of KM44C1000D memory simultaneously; The RA0 of integrated SAA5700GP～RA9 end is connected with the A0～A9 end of KM44C1000D memory, and its RA2～RA9 end is connected with 2 ends～9 ends of address latch 74F573N simultaneously; The A of 12 ends of address latch 74F573N～19 ends and character library GB5007T ₂, A ₁₀, A ₁₁, A ₉, A ₈, A ₁₃, A ₁₄, A ₁₇Connect; The E end of character library GB5007T and VSS end common ground; The VSS end ground connection of memory KM44C1000D, vdd terminal connection+5V power supply; The EN of address latch 74F573N end and GND end are distinguished ground connection, and VCC is connected with+5v power supply; The ROMCS end of the C1 end of address latch 74F573N, the C/VPP end of character library GB5007T, integrated SAA5700GP is connected to each other; The BLUE of integrated SAA5700GP, GREEN, RED hold outside output signal.

3, teletext according to claim 1 and 2 receives decoding device, it is characterized in that: the cpu control circuit of this device is that the RESET of single chip computer AT 89C1051 holds by resistance and diode ground connection, connect+the 5v power supply through electric capacity simultaneously, X1 is connected simultaneously through electric capacity difference ground connection by crystal Z1202 with the X2 end, GND holds ground connection, VCC termination+5v power supply; The P1.2 end of single chip computer AT 89C1051 is connected the reception remote controller signal with the INTO end; The P1.3 end output control signal of single chip computer AT 89C1051, the P1.7 end is connected with the RESET end with integrated SAA5700GP, the P1.6 end is connected with the BLAN end of integrated SAA5700GP, and the P1.5 end is connected with the SDA end with the SCL of integrated SAA5700GP respectively with the P1.4 end.

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