CN2218999Y - Frequency converter for cabled TV - Google Patents
Frequency converter for cabled TV Download PDFInfo
- Publication number
- CN2218999Y CN2218999Y CN94247357U CN94247357U CN2218999Y CN 2218999 Y CN2218999 Y CN 2218999Y CN 94247357 U CN94247357 U CN 94247357U CN 94247357 U CN94247357 U CN 94247357U CN 2218999 Y CN2218999 Y CN 2218999Y
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- utility
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- frequency converter
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Abstract
The utility model relates to a frequency converter for a cable TV, which is suitable for using on a TV with no cable television receiving function to receive cable television programs. The control unit of the utility model adopts monolithic computer mu PD17012GF-531 of the NEC company used for electronic tuning, not only has rich control functions, but a phase-locked loop circuit is included in the utility model to form the whole control circuit with the only one piece of the phase-locked loop circuit. The utility model can adopt batteries to be used for setting data retention for users as the backup power, the E<2>PROM can be omitted, and the whole machine cost is lowered. The utility model realizes the functions such as remotely controlling the on-off of the television, channels remotely selecting, frequency trimming, favourite channels editing and storing, automatic searching, timing cutoff, etc. The utility model leaves a descrambler interface.
Description
This patent relates to wired TV technology, and particularly technology is preserved in the outage of the formation of cable TV frequency conversion control circuit and interfacing and user's setting data.
Three kinds of frequency systems of 300MHZ, 450MHZ and 550MHZ are being adopted in the transmission of China's cable TV (hereinafter to be referred as CATV), have not only utilized each channel of radiovision (hereinafter to be referred as DS), have also utilized the additional channel between the DS channel.For example, 30 additional channels between seven additional channels between DS5 and the DS6 and DS12 and the DS13.Simultaneously, in order to make full use of frequency resource, transmit TV programme as much as possible in every kind of frequency system, most CATV TV station has adopted the neighbour to keep pouring in transferring technology.
And the television set that has on the current social, the overwhelming majority does not receive the ability of additional channel, does not more have adjacent receiving ability frequently, can only receive the DS program that send every taking place frequently.When receiving the CATV program with such television set, must be just possible by " cable TV frequency converter ".
The function of cable TV frequency converter (being designated hereinafter simply as frequency converter) is to adopt digital frequency synthesis technology, receive whole DS channels and additional channel in each frequency system of CATV exactly, through frequency translation, convert the CATV program of choosing to a certain fixing DS channel output, deliver to the antenna end of television set, make general television set can receive take place frequently whole channels of the CATV that send of neighbour by frequency converter.The user uses for convenience, has also adopted the remote control channel selection in the design of frequency converter, canal digital demonstration, remote control switch, timing shutdown, favorite channel layout storage, and technology such as frequency trim also have some to increase coded lock, descrambler interface etc.
On " TV tech " magazine in December, 1993 number, a kind of current extensive adopted converter circuit introduced in " CATV subscriber computer up converter " article, single chip microcomputer (MQS3001P) is selected channel by phase-locked loop (MC44802) control CATV tuner, adopts E
2PROM (MCM2814) storage user setting data.
In China's utility model patent 92242691.0, a kind of CATV frequency converter is disclosed, control receives the next signal of remote-control transmitting or passes through machine upper keyboard receiving inputted signal by infrared remote receiver with single-chip microcomputer, select channel by phase-locked loop circuit control tuner, and the control display demonstrates selected channel and for information about, adopts E
2PROM storage user setting data.
More than two kinds of frequency converters all adopted independently phase-locked loop circuit and tuner interface, control is carried out data with single chip microcomputer by external data line and phase-locked loop circuit and is transmitted, control tuner selection channel.For user's setting data can be preserved, used E after outage
2PROM.Like this, need three integrated circuits could constitute complete control circuit, interface circuit complexity, system cost height.
The purpose of the utility model patent is a kind of cable TV frequency converter of design.It reduces the quantity of integrated circuit as much as possible under the condition of guaranteeing the various functions of frequency converter, simplify circuit and interface, reduces system cost.
For finishing above-mentioned purpose of design, the digital tuning that the utility model patent has adopted NEC Corporation to include phase-locked loop circuit uses single-chip microcomputer μ PD17012GF-531 as the frequency converter nonshared control unit, finishing by its a slice by the function that single chip microcomputer and each a slice of phase-locked loop circuit are finished originally, save phase-locked loop intergrated circuit, simplified the circuit formation.Simultaneously, because single chip microcomputer is communicated by letter by internal data bus with phase-locked loop, also simplified interface circuit.
Adopted the single chip microcomputer of CMOS technology again because of the utility model, can realize keeping the data of internal RAM, so the utility model can adopt battery power supply in support with extremely low electric current, behind system cut-off, preserve data, replaced the E of high price with battery at a low price
2PROM has reduced system cost.
Figure (1) is the utility model system, comprises control single chip microcomputer, CATV tuner, infrared receiving module, power supply, demonstration and keyboard.Only just constituted control section, in its electric power system, increased data and preserved back-up source 2, saved independently phase-locked loop circuit and E with a single chip microcomputer 1
2PROM.
Figure (2) is depicted as data and preserves power backup circuit.
The operating voltage of control IC 1 is 5V ± 10%, the output of three terminal regulator 3 also is 5V ± 10%, because the output of three terminal regulator 3 will be powered to IC1 by diode D2 in the circuit, D2 has a forward voltage drop, if do not take measures, IC1 will can not get normal working voltage.This programme adopts D1 that the output of three terminal regulator 3 is improved a diode forward pressure drop, offsets the forward voltage drop of D2, makes IC1 obtain normal working voltage.
Diode D4 and R2 constitute voltage detecting circuit, and when system's normal power supply, the output voltage of three terminal regulator 3 makes the IC1 operate as normal by the CE end that D4 is added to control IC 1; When system's power supply stops, three terminal regulator no-output voltage, diode D4 ends, and the CE end is come ground level by R2, makes control IC 1 enter low-voltage data preservation state.
Because the utility model has saved independently phase-locked loop circuit and E
2PROM makes the main integrated circuit of system be reduced to two (control section a slices+remote controller IC) by original four (three+remote controller of control section IC), circuit reduction not only, and interface is simple, and peripheral cell is few, and the integrated circuit cost also can reduce.
Figure (3) provides a kind of application example.
The CATV frequency converter that constitutes by figure (3) circuit has following function:
1, is applicable to that various bands give the CATV tuner of frequency division (PSC) output.
2, three LED are digital shows various information, and back two 7 sections LED indicated channels number and timing shutdown time, platform and frequency trim direction are searched in first demonstration up and down, when receiving additional channel, show " Z " word.
3, two LED display working conditions.(standby, timing shutdown)
4, this CATV frequency converter can receive 59 channels.Wherein, television channel 1-22, additional channel 1-37, all channel all has been stored in the control IC 1.
5, can store the layout of 39 favorite channels, still can preserve after the outage.
6, can press the direct channel selection of channel of television channel and additional channel, the 1-9 channel is a single key stroke, and 10 channels are above to be two key operations.
7, storage of channel channel selection in proper order, the user can be organized in the 1-9 channel to the channel of often seeing, realizes the rapid channel selection of singly-bound.
8, have channel automatic scan function, can understand which platform at once has program, helps the layout of favorite channel.
9, can carry out frequency trim separately to each channel, (scope: ± 3.875MHZ) store immediately with transferring, still keep after the outage, can effectively overcome the unpunctual bad problem of view reception effect of TV station's frequency.
10, last channel call out function is again arranged, like this, can between two channels wanting to see, switch rapidly, very convenient.
11, can realize timing shutdown (15,30,45,60,75,90 minutes)
12, remote control switch television set
13, during remote-controlled start-up, the television channel of watching when entering shutdown.
14, leave communication interface (I with descrambler
2The C bus mode) can control descrambler, realize the descrambling function of multiple mode.
15, adopt backup battery to preserve user's setting data.Also available E
2PROM stores data, leaves E
2PROM interface and functional select switch.
16, channel selection key and switch switch are up and down arranged on the transducer body, and television channel and additional channel switch key.
When control IC received that the starting-up signal sent from remote controller or the start key on this machine are pressed, control IC 1 made the relay adhesive from J0 end output high level, connects TV set power.After receiving user's channel selection information, control IC accurately is locked on the frequency of desire reception the tuner local oscillation frequency by the phase-locked loop circuit of inside.When some regional TV station's frequency inaccurate (difference being arranged) with national standard, when view reception effect is bad, press the fine setting key on the remote controller after, with finely tuning the key frequency of amendment up and down, make view reception effect obtain the best again.After pressing scanning key, television set is since the upwards scanning of first channel, and each channel stopped for three seconds, had all swept up to 59 channels.Which channel the user can note at this moment program.When the user desires that own favorite channel concentrated layout, can choose earlier,, press the channel of thinking layout again and get final product by after the storage key by the layout channel.
Press the timing shutdown key, two seven sections LED show the shutdown timing, just can select suitable shutdown regularly by this key continuously.
Behind manual or remote control timing shutdown, all the user's setting datas in the control IC still keep, the channel of watching when entering last time immediately during the next time start and shutting down.
After transducer body pulled out power supply, inner backup battery came into operation, and preserved the data in the control IC, inserted power supply again until next frequency converter.
When watching by the channel of TV station's scrambling, can press the descrambling key, control IC is passed through I
2The C bus is sent the number information of this channel, after descrambler (needing to install in addition) receives this information, changes the descrambling mode of this channel over to, carries out descrambling.
Description of drawings:
Figure (1) is the structure principle chart of cable TV frequency converter
Figure (2) is the power supply schematic diagram of cable TV frequency converter
Figure (3) is the circuit diagram of cable TV frequency converter
Wherein: the 1st, control integrated circuit μ PD17012GF-531
The 2nd, back-up source
The 3rd, three terminal regulator
Claims (2)
1. cable TV frequency converter, be specially adapted to not receive the television set reception cable television program of additional channel ability and adjacent receiving function frequently, comprise power supply, control integrated circuit, display, enter key, infrared remote receiver, remote controller, cable television tuner, it is characterized in that control integrated circuit is μ PD17012GF-531, it is battery that data keep power supply.
2. cable TV frequency converter according to claim 1 is characterized in that data keep the positive pole of battery to pass through resistance R
1With diode D
3Circuit in parallel is connected on the V of control integrated circuit
DDEnd, the CE end passes through R
2Ground connection, stabilizer output voltage is by diode D
2And D
3Receive V respectively
DDHold with CE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94247357U CN2218999Y (en) | 1994-12-14 | 1994-12-14 | Frequency converter for cabled TV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94247357U CN2218999Y (en) | 1994-12-14 | 1994-12-14 | Frequency converter for cabled TV |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2218999Y true CN2218999Y (en) | 1996-01-31 |
Family
ID=33852601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94247357U Expired - Fee Related CN2218999Y (en) | 1994-12-14 | 1994-12-14 | Frequency converter for cabled TV |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2218999Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100463045C (en) * | 2004-01-02 | 2009-02-18 | Lg电子株式会社 | Display system and control method thereof |
| CN108289242A (en) * | 2018-01-17 | 2018-07-17 | 青岛海信电器股份有限公司 | The method of adjustment and device of television channel receives frequency |
| CN109951234A (en) * | 2019-03-07 | 2019-06-28 | 苏州市高事达信息科技股份有限公司 | A kind of electric adjustable channel number setting control circuit and its setting method |
-
1994
- 1994-12-14 CN CN94247357U patent/CN2218999Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100463045C (en) * | 2004-01-02 | 2009-02-18 | Lg电子株式会社 | Display system and control method thereof |
| CN108289242A (en) * | 2018-01-17 | 2018-07-17 | 青岛海信电器股份有限公司 | The method of adjustment and device of television channel receives frequency |
| CN108289242B (en) * | 2018-01-17 | 2021-07-23 | 海信视像科技股份有限公司 | Method and device for adjusting receiving frequency of television channel |
| CN109951234A (en) * | 2019-03-07 | 2019-06-28 | 苏州市高事达信息科技股份有限公司 | A kind of electric adjustable channel number setting control circuit and its setting method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |