CN2138373Y - Cable television receiver receiving and emitting unit - Google Patents

Abstract

The utility model discloses a cable television information receiving and emitting device belonging to the field of communication, cable television, computer application, etc. The device is composed of a receiving part and an emitting part. The emitting part is provided with a microcomputer and an emitting device. The information receiving selector of the receiving part is composed of a receiving unit, a single-chip computer processing unit, a displaying control unit, a tristimulus signal forming unit, and a composite television signal synthesis unit, etc. The data of a computer information base is added to the emitting device, is transformed into a radio frequency signal and is downloaded from the front end through a cable television network. The data signal selected through the information receiving selector is processed. A user can carry out a simple operation and can retrieve the information required through a keypad. The information is displayed by a domestic television.

Description

Cable television receiver receiving and emitting unit

A kind of cable TV information transceiving device relates to technical fields such as communication, computer application.

At present, domestic cable TV, by front end (signal source, modulator, blender etc.) with TV signal send into that cable television network amplifies, branch, distribution (being undertaken) by amplifier, splitter, distributor etc., be sent to each TV user.

The deficiencies in the prior art part is: the user is the signal that sends of receiving front-end passively, can't select at random according to the needs of oneself.

The purpose of this utility model is: the communication resources of exploitation cable TV, utilize microcomputer to set up information bank, data reach each cable television terminal through dispensing device under front end, after the user connects the message pick-up selector, can be to required various information stochastic retrieval, and show on TV.

The technical solution of the utility model is: form this device in two sub-sections by sending part and message pick-up portion.Its principle assumption diagram as shown in Figure 1.Send part and be made of microcomputer and dispensing device, microcomputer interface is connected to dispensing device, and dateout is modulated in the FSK mode, is up-converted into the transmissible radiofrequency signal of cable TV again, passes down from front end.Message pick-up partly has splitter and message pick-up selector, and the message pick-up selector is received by signal, and control is handled, shown to single-chip microcomputer, and tristimulus signals form and synthetic five unit of composite video signal are formed.See shown in Figure 2.The data radiofrequency signal that the signal receiving unit gating sends obtains standardized digital signal through amplification down-conversion, FSK demodulation, delivers to the single-chip microcomputer processing unit.This unit contains 0～90 little button, a NP key (skipping) and a RES key (elimination) of selecting information.Indicative control unit forms the unit according to the Data Control tristimulus signals that the front receives, deposits, and forms R, G, B signal and row, field sync signal, send next stage composite video signal synthesis unit, and synthetic signal just can send the domestic television set information of carrying out to show.Normally watch for not influencing TV.Message pick-up selector input is got signal by a splitter from cable television network, and the main output of output and splitter is linked domestic television set by selector switch.

Of the present utility model being characterised in that: device is formed by sending and receive two parts, and sending part has microcomputer and dispensing device, and dispensing device is connected with microcomputer interface.Message pick-up partly has splitter and message pick-up selector, and splitter is connected with cable TV, and the other end is linked domestic television set by selector switch, and message recipient one end links to each other with splitter, and the other end links to each other with switch.The U38 of dispensing device and RC circuit are formed the FSK modulator, and through U35 and local oscillation signal mixing, U36 amplifies, SAW filtering, amplify after cable passes (as shown in Figure 3) down through U37.The circuit of message pick-up selector divides five unit such as receiving unit, single-chip microcomputer processing unit, indicative control unit, tristimulus signals formation unit, composite video signal synthesis unit.The circuit of receiving element: splitter divides one tunnel radiofrequency signal to amplify through U32, SAW filtering, by Q1, Q2 to be added to U33 and to carry out mixing, amplify by Q3, Q4 again, L10, L11, C39～41 frequency-selectings are after Q7, Q8 amplification, U34, Q9, Q10 demodulation, output signal FSKOUT send single-chip microcomputer processing unit (shown in Figure 4).Single-chip microcomputer processing unit circuit: signal is linked U35, the P30 pin of U1 is linked in the output of U35, the P1 mouth of U1 connects keyboard, keyboard scan input signal STA0, STA1 are from U5, the P0 mouth of U1 is linked the input of U2, the output of U2 is linked on the low eight bit address lines of U3, and indicative control unit is also linked in the output of U2 in addition; 2Q～4Q of U2 links A, B, the C pin of U4, and the P0 mouth of U1 is also linked data terminal and the indicative control unit of U3, and the P2 mouth of U1 is linked on the high seven bit address lines of U3 and indicative control unit; The Y0 of U4, Y1 pin are linked indicative control unit (shown in Figure 5).The data terminal of indicative control unit circuit: U6 is linked data/address bus AD0～AD7 pin of U1, the CS pin is linked Y1,15 outputs that address wire is linked U8～U11 of U12, the two-way input of U8～U11 divide the address that is clipped to U6 to export and (shown in Figure 6) exported in the address of U1.Tristimulus signals form unit line: U13, the data output end of U12 is linked in the input of U14, U15 is linked in its output, the input of U16, obtain the DOTCK pixel clock behind the U17 oscillator process U18 two divided-frequency and deliver to U15, U16 is shifted, U19 and part U24, U25, U29 gate circuit generation LLATCH low byte squeezes into signal and the HLATCH high byte is squeezed into signal, U24, U25, gate circuit combination results SH/LD displacement/latch signal of U30, HSYNC, VSYNC is through U20 character clock cycle of time-delay, through U21, U22 and U27, U28, the U29 gate circuit produces the HVSYNC composite synchronizing signal, send the composite video signal synthesis unit.U15, U16 export at the DISPEN signal after a character clock cycle time-delay, control produces R, G, the B tristimulus signals send composite video signal synthesis unit (shown in Figure 7), composite video signal synthesis unit circuit: HVSYNC links the U23-2 pin, R, G, B link U23-3,4,5 pin, the full television video frequency signal of U23-9 pin output Phase Alternation Line system is linked the U31-11 pin, and the U31-9 pin is exported full TV RF signals through the LC bandpass filtering and removed television set (shown in Figure 8).

Fig. 1 is a structural principle block diagram of the present utility model;

Fig. 2 is the utility model message pick-up selector structure block diagram;

Fig. 3 is the line map of the utility model dispensing device;

Fig. 4 is the utility model receiving element line map;

Fig. 5 is the utility model single-chip microcomputer processing unit line map;

Fig. 6 is the utility model indicative control unit circuit;

Fig. 7 forms unit line figure for the utility model tristimulus signals;

Fig. 8 is the utility model composite video signal synthesis unit line map;

Fig. 9 is the utility model single-chip microcomputer workflow diagram;

Figure 10 is the utility model timing circuit working waveform figure.

Line map signal of the present utility model enters from the left side, the figure number of circle number for coming; Signal goes out from the right, and circle is number by being gone figure number.

Below in conjunction with embodiment the utility model further is illustrated: example 1: be used for the cable TV that build in the city, by sending part at the cable TV front end, set up an information database with microcomputer, the content of information can be the various graph text informations of some people's daily needs, also can be other non-common information.The layout of information can be with coding of an information (width of cloth literal or a figure).Typical stage information is with its coding and together constantly circulation transmission of content, and non-common level information is inserted as required.The data of microcomputer interface output are modulated to radio frequency through the dispensing device conversion, take one section idle frequency band of cable TV and other TV signal and together pass down.Send line map partly as shown in Figure 3, microcomputer interface output " 0/1 " data set is added to U38, and U38 and RC circuit are formed the FSK modulator, and the fsk signal of exporting from R75 is added to the Q12 base stage through C59, C63, R62 link U35-1 through buffering, with the mixing of U35-3 local oscillation signal.(U35-3 exports through C83, R83 from the local oscillation signal that Y4, Q15, Q14 and lc circuit produce).U35-5 is through C67 in mixing output, links Q13 and is added to the U36 amplification through C68, R66 again, delivers to band pass filter SWA from C69 then, gets with frequency signal (data radiofrequency signal) and links the U37 amplification after C73 output is added to biography under the mixing of cable TV front end by C65.Receiving unit of the present utility model can be contained in each cable television terminal, and its message pick-up selector is by receiving element, single-chip microcomputer processing unit indicative control unit, and tristimulus signals form the unit, and circuits such as composite video signal synthesis unit are formed, below division it.Receiving element: splitter Z branch one tunnel radiofrequency signal is through the LC high pass, U32 amplifies, it is shown in Figure 4 to link band pass filter SAW(from C31) the gated data radiofrequency signal is added to the local oscillation signal mixing of linking U33-1 pin and U33-3 pin after Q1, Q2 amplify from C32, R25, U33-5 output is amplified by C36, connection Q3, Q4, and the frequency selection circuit that is added to L10, L11, C39～C41 composition is again chosen difference frequency signal.Link Q7 base stage and Q8 amplification through R41, C42, upon mediation circuit U 34, Q9, Q10 obtain reconciling signal output (FSKOUT), are added to the U35-3 shaping of single-chip microcomputer processing unit at last, produce standardized digital signal from U35-11 and send single-chip microcomputer to handle.

The single-chip microcomputer processing unit: U1(8031) P1 mouth connects keyboard, and scanning input STA0, the STA1 of keyboard are from U5(74LS273) 1Q, 2Q pin.This keyboard contains 0～90 little button of numeral, and a NP key (skipping) and a RES key (elimination) are as shown in Figure 5.The output FSKOUT of receiving element links U35(LM361) input, export the P30 pin of linking U1 from U35-11, as the input that receives data.The P0 mouth of U1 is linked U2(74LS373) 1D～8D pin of address latch, the 1Q of U2～8Q pin is linked U3(27256) the low eight bit address line A0～A7 pin of memory under program, the 1Q of U2～8Q pin is linked indicative control unit in addition.The 2Q of U2～4Q pin connects U4(74LS138) A, B, the C pin of address decoder.U4 address decoder output Y0, Y1 pin also will be linked indicative control unit and go, their presentation address 1000～1003H.The single-chip microcomputer processing unit is the core of whole message pick-up selector, and behind the power-on reset, 8031 reset MC6845, and 62256 by its control.8031 keyboard scans, and read by the next data of P30 serial port, it is deposited in 62256,8031 pairs of control register U5 issue an orders allow MC6845 work, and discharge 62256 to MC6845, are promptly shown by MC6845 control 62256.At this moment 8031 turn to the supervision keyboard, see if there is new keyboard operation (shown in Figure 9).Indicative control unit is shown in Figure 6: data/address bus AD0～AD7 D0 U6(MC6845)～D7 pin connection U1(8031), sheet selects the CS pin to connect Y1.U12(62256) show the output of the address wire A0～A14 of refresh memory, the address output that this two-way address is respectively MC6845 and 8031 from alternative circuit U 8～U11(74LS157).Data wire D0～D7 of U12 divides two-way; One the tunnel through U7(74LS245) link 8031 data/address bus AD0～AD7; One the road links tristimulus signals forms unit (seeing accompanying drawing 7), when control register U5-16,19 pin=" H ", and permission MC6845 work, U8～U11 selection B group is imported the address as 62256, is promptly controlled by MC6845 simultaneously.The address corresponding relation is:

62256

AO

A1

A2

......

A12

A13

A14

MC6845

CCLCK

MAO

MA1

......

MA11

RAO

U5-15

Character clock CCLCK is as 62256 A0.Such character clock reads 62,256 two bytes and forms eight display elements in the cycle.

It is shown in Figure 7 that tristimulus signals form unit line: U13, U14(74LS273) input link on data wire XD0～XD7 of 62256, output to U15, U16(74LS166).U20(74LS174) D1～D3 pin is linked HSYNC, VSYNC and the DISPEN end of MC6845, and output Q1, the Q2 pin of U20 are linked U21, Q22 respectively.U21, U22 and part U28, U29, U27 gate circuit will independently be gone, field sync signal (HSYNC, VSYNC) is combined into composite synchronizing signal (HVSYNC) and is sent to composite video signal synthesis unit (seeing accompanying drawing 8).U17, U18, U19 and part U25, U29, U24, U30 gate circuit are formed timing circuit, and the waveform that is produced as shown in figure 10.62256 data of reading are squeezed into signal at the LLATCH(low byte) and the HLATCH(high byte squeeze into signal) effect under, squeeze into U13, U14 at SH/LD(displacement/latch signal) effect down the content of U13, U14 deliver to U15 and U16 respectively, and export by the QH displacement.Under through the DISPEN signal controlling after the character clock CCLCK time-delay, form R, G, B tristimulus signals.During DISPEN=" H ", R=X, G=X, B=O, such R, G combination can produce four looks altogether, form so display frame has four kinds of colors; When DISPEN=" L ", R=0, G=0, B=1 have a kind of color to show outside the viewing area.

Composite video signal synthesis unit circuit as shown in Figure 8.The HVSYNC signal that forms the unit from three primary colors send U23-2 pin, tristimulus signals R, G, B send U23-3,4,5 pin, the 9 ends output Phase Alternation Line system composite video signal of MC1377, this signal can be done the television video input, receiving the U31-11 pin simultaneously is modulated on a certain channel by MC1374, by U31-9 pin output radiofrequency signal through L3, L4, C24-C27 filtering after selector switch send the television set rf inputs, show.

Embodiment 2: the utility model also adapts to and is used for closed-circuit television system, as luxurious hotel, can provide abundant information as traffic, tourism, news, meteorology quickly and easily ... Deng.By the microcomputer that sends part these information are weaved into a database, be dealt into the television set in each terminal one each guest room from the closed-circuit television front end through dispensing device, the guest room passenger can retrieve required information with the utility model message pick-up selector, thereby watches on the television set corresponding channel.

Software content if can be further improved in the foundation of the utility model information bank, modification, additional very convenient, and then all trades and professions all can be used, and can share networked resources, can build up the whole day information program of the cable TV station.

Claims (1)

1, a kind of information transceiving device of cable TV is formed by sending, receive two parts, and sending part has microcomputer and dispensing device, and microcomputer interface is linked dispensing device; Receiving unit is made up of splitter, message pick-up selector in the terminal of cable TV, and the message pick-up selector divides five parts; Message pick-up, single-chip microcomputer handle, show that control, three primary colors form, composite video signal is synthetic; It is characterized in that: " 0 "/" 1 " data set of microcomputer output is added to U38-1, U38 and RC circuit are formed the FSK modulator, cushion after C63, R62 link U35-1 and the mixing of U35-3 local oscillation signal to the Q12 base stage through C59 from the fsk signal of R75 output, U35-3 from Y4, Q15, Q14, and the local oscillation signal that produces of lc circuit export through C83, R83, mixing output U35-5 links Q13 through C67 and is added to the U36 amplification through C68, R66 again, from C69 through band pass filter SAW, get with the audio data signal and link the U37 amplification, export through C73 by C65; Receiving element branch one tunnel radiofrequency signal of receiving unit is through the LC high pass, U32 amplifies the back and links band pass filter SAW from C31, the gating radiofrequency signal, being added to Q1, Q2 from C32, R25 amplifies, link U33-1 and the mixing of U33-3 local oscillator, amplify the frequency selection circuit that is added to L10, L11, C39～C41, composition again through C36 and Q3, Q4 and get difference frequency signal, link the Q7 base stage and Q8 amplifies through R41, C42, obtain restituted signal FSKOUT through demodulator circuit U34, Q9, Q10, be added to U35-3; The P1 mouth of U1 connects the scanning input of keyboard in the single-chip microcomputer processing unit, STAO, STA1 are from 1Q, the 2Q pin of U5, the output FSKOUT of receiving element links U35, output to the P30 pin of U1 from U35-11, the P0 mouth of U1 is linked 1D～8D pin of U2 and is also linked indicative control unit, the 2Q of U2～4Q pin is linked A, B, the C pin of U4, the P0 mouth of U1 also connects O0～O7 pin and indicative control unit of U3, the P2 mouth of U1 is linked A8～A14 pin and indicative control unit of U3, and the Y0 of U4, Y1 pin are linked indicative control unit; The D0 of the U6 of indicative control unit～D7 pin connects AD0～AD7 pin of U1, and the CS pin connects Y1, and the address wire A0 of U12～A14 is from the output of alternative circuit U 8～U11, and data wire D0～D7 of U12 divides two-way; One the tunnel through U7 to 8031; One the road links tristimulus signals forms the unit; The input that tristimulus signals form U13, the U14 of unit is linked on 62256 the data wire, and U15, U16 are linked in output.The D1 of U20～D3 pin is linked HSYNC, VSYNC and the DISPEN end of MC6845, and the Q1 of U20, Q2 pin are linked U21, U22 respectively.U21, U22 and U28, U29, U27 gate circuit will independently be gone, the synthetic composite synchronizing signal (HVSYNC) of field sync signal (HYSNC, VSYNC) is sent to the composite video signal synthesis unit, and U17, U18, U19 and part U25, U24, U29, U30 gate circuit are formed timing circuit; Send the composite synchronizing signal of composite video signal synthesis unit to send 2 pin of U23, three primary colors R, G, B signal send 4,5,6 pin of U23, the 9 pin outgoing television signals of U23 (MC1377).

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