CN2080277U - Computerized digital field intensity measuring instrument for tv full channels - Google Patents
Computerized digital field intensity measuring instrument for tv full channels Download PDFInfo
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- CN2080277U CN2080277U CN 89215523 CN89215523U CN2080277U CN 2080277 U CN2080277 U CN 2080277U CN 89215523 CN89215523 CN 89215523 CN 89215523 U CN89215523 U CN 89215523U CN 2080277 U CN2080277 U CN 2080277U
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- field intensity
- microsystem
- signal
- measuring instrument
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- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 5
- 230000003321 amplification Effects 0.000 abstract description 3
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000004377 microelectronic Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 2
- 239000008358 core component Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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Abstract
The utility model relates to an intelligent digital field intensity measuring instrument for TV full channels, which is composed of a varactor tuner, an IF amplification circuit, a microcomputer system, etc. Utilizing the correlativity between television field intensity signals and television AGC signals, the utility model realizes the control and the measurement of the discrete magnitude of television field intensity signals through microelectronic technique. The whole product has the functions of all key operation, all digital display, power saving performance, standard channel selection, automatic frequency search, channel, frequency, field intensity value digital display, etc.
Description
The utility model relates to a kind of electronic measuring instrument: TV all-channel intelligent digital field strength meter.
Along with constantly popularizing of television set, corresponding measuring instrument has also obtained very big development, and TV all-channel field intensity meter is a kind of instrument that is used for measuring intensity of TV signal, and it is widely used in television engineering and antenna works.The field intensity meter of domestic production at present all is pointer, and function is limited, and it is also not too convenient to use, and is badly in need of a kind of with Modern Television Technology, the microelectric technique novel field intensity meter as the basis on the market.
The purpose of this utility model is exactly will develop a kind of digital demonstration, connect the intelligent field strength meter of key operation entirely.
TV all-channel intelligent digital field strength meter is by varactor tuner, intermediate level circuit, microsystem and corresponding interface circuits, keyboard and demonstration, several most 1FAGC(intermediate frequency automatic gains controls of forming (as shown in Figure 1) intermediate level circuits of power supply) signal is connected on the data/address bus of microsystem after the A/D conversion.The control of RF AGC(high frequency automatic gain) signal is sent the AGC signal input port that is connected to varactor tuner after the D/A conversion by the data/address bus of microcomputer.Like this, just will postpone RFAGC and 1FAGC cuts off, simplify the relation of TV signal at different levels, because high amplification gain GH is to be the function of a single variable of independent variable with RF AGC, microprocessor just can be realized the control to the discrete definite value of high amplification gain by the voltage of control RFAGC; Again because image medium-frequency signal S
IExist direct corresponding relation with 1FAGC voltage, like this, the detection of image medium-frequency signal has just been become detection to direct current 1F AGC voltage; And input signal field intensity S
ECan utilize formula
S
E=S
I(1F AGC)-GH(RF AGC) calculates.
Here, RF AGC is by quantitatively control of microprocessor, and 1FAGC is by feedback principle control automatically.
Channel selecting signal is accessed through program control band switch by the internal memory of microsystem and is connected on the channel selector of varactor tuner; Display and keyboard are connected with the I/O mouth of microsystem respectively.
The entire work process of instrument is controlled by microprocessor program, after the start, microsystem is put maximum with RF AGC automatically and is given varactor tuner, read 1F AGC signal then, it is compared with the maximum and the minimum value that are provided with, if 1F AGC signal level between is then according to formula S
I(1FAGC)-GH(RFAGC) calculate the field intensity value, deliver to display again, if the 1F AGC signal that reads less than minimum value, then microsystem is put SE automatically less than range, shows SE then; If the 1F AGC that reads is greater than maximum, then microsystem reduces an order of magnitude with RF AGC automatically, again it is compared with minimum value, as if less than, then put SE and be higher than range, show SE then, instead in, then read 1F AGC again, repeat said process again.
It is the technology of core component that TV all-channel intelligent digital field strength meter has been broken through with the measuring amplifier, it has utilized the correlation of TV field intensity signal and TV automatic gaining controling signal, be based on existing color TV technology and dedicated IC chip, realized control and measurement with microelectric technique to TV field intensity signal discrete value, entire product has and connects key operation entirely, digital demonstration, performances such as power consumptive province, also has the standard channel selection, automatic frequency search, functions such as channel, frequency, the demonstration of field intensity value numeral.
An embodiment of the present utility model, circuit as shown in Figure 2, I among the figure
9Be 8,031 eight single chip microcomputers, I
14Be the PROM(2732 that 32K can wipe with ultraviolet light), I
2, I
7, I
17, I
4Be eight D-latchs (74LS373), I
13Be A/D converter (ADC0809), I
11Be D/A (DAC0808), I
6, I
8Be 4 bit digital comparators (74LS85), I
5Be two four binary counters (74LS393), I
16Be 3-8 decoder (74LS138), I
10Model be HA11440, I
3Model be 74HC240, I
1Model be 74LS06, display uses 6 LED LCD, varactor tuner and in put integrated package and all use the commercially available prod, the program Solidification of controlling the whole progress of work is at integrated circuit I
14In, call in execution after the start automatically.
Claims (3)
1, a kind of TV all-channel intelligent digital field strength meter, by varactor tuner, intermediate level circuit, microsystem and corresponding interface circuits, several most compositions of keyboard and demonstration, it is characterized in that: the IFAGC of intermediate level circuit (control of intermediate frequency automatic gain) signal is connected on the data/address bus of microsystem after the A/D conversion, and RFAGC (control of high frequency automatic gain) signal is sent the AGC signal input part that is connected to varactor tuner after the D/A conversion by the data/address bus of microsystem.
2, field strength meter according to claim 1 is characterized in that: channel selecting signal is accessed through program control band switch by the internal memory of microsystem and is connected on the channel selector of varactor tuner.
3, field strength meter according to claim 1 is characterized in that: have a display and keyboard to be connected with the I/O mouth of microsystem respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89215523 CN2080277U (en) | 1989-08-17 | 1989-08-17 | Computerized digital field intensity measuring instrument for tv full channels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89215523 CN2080277U (en) | 1989-08-17 | 1989-08-17 | Computerized digital field intensity measuring instrument for tv full channels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2080277U true CN2080277U (en) | 1991-07-03 |
Family
ID=4871093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89215523 Withdrawn CN2080277U (en) | 1989-08-17 | 1989-08-17 | Computerized digital field intensity measuring instrument for tv full channels |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2080277U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101056110B (en) * | 2006-04-13 | 2010-06-30 | 三洋电机株式会社 | Noise canceller and AM receiving apparatus using the same |
| CN102307052A (en) * | 2011-09-23 | 2012-01-04 | 长春卓尔信息安全产业股份有限公司 | Intelligent fixed-frequency interferometer |
| CN106899845A (en) * | 2017-04-19 | 2017-06-27 | 成都市宏山科技有限公司 | It is applied to the digitlization field intensity meter of DVB |
-
1989
- 1989-08-17 CN CN 89215523 patent/CN2080277U/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101056110B (en) * | 2006-04-13 | 2010-06-30 | 三洋电机株式会社 | Noise canceller and AM receiving apparatus using the same |
| CN102307052A (en) * | 2011-09-23 | 2012-01-04 | 长春卓尔信息安全产业股份有限公司 | Intelligent fixed-frequency interferometer |
| CN102307052B (en) * | 2011-09-23 | 2013-10-16 | 长春卓尔信息安全产业股份有限公司 | Intelligent fixed-frequency interferometer |
| CN106899845A (en) * | 2017-04-19 | 2017-06-27 | 成都市宏山科技有限公司 | It is applied to the digitlization field intensity meter of DVB |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |