CN2183570Y

CN2183570Y - Television storage oscilloscope

Info

Publication number: CN2183570Y
Application number: CN 93244902
Authority: CN
Inventors: 罗守恒
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-11-15
Filing date: 1993-11-15
Publication date: 1994-11-23
Anticipated expiration: 2003-11-15

Abstract

The utility model relates to a television storage oscilloscope which comprises a display circuit and a record circuit. The utility model is characterized in that the display circuit is a decoding display circuit of digital comparison method and is mainly composed of a date writing counter, a line counter, seventeen integrated packages (IC1, IC2, IC3, IC4, IC5, IC6, IC7, IC8, IC9, IC10, IC11, IC12, IC13, IC14, IC15, IC16, IC17), a quartz crystal unit, a digital switch (IC18) and a screen selecting device. The utility model has the advantages of simple circuit, no auxiliary circuit support, low cost and high cost performance. The utility model has the function of large screen display under the condition of high precision and can utilize a minor memory space to store multiple screens of display content, which is favorable for the complete observation and storage of the transition process. A television can serve as a display device, and the utility model can also be connected with a video recorder for recording to store the measuring signal for a long time.

Description

Television storage oscilloscope

The utility model relates to the electronic measuring instrument technical field, specifically the TV storage oscilloscope.

Its structure of existing storage oscilloscope mostly is central processing unit control work down, and complicated support circuit need be arranged, and needs to use the high special circuit of some costs.Though its function is more perfect, tangerine structure complexity, price is very high, and display screen is less, is unfavorable for the teaching observation.

The purpose of this utility model is to provide a kind of and can connects with the televisor of pal mode, makes display with televisor, reaches high precision, large screen display, and guarantees the basic function and the advantage of storage oscilloscope, TV storage oscilloscope simple in structure, that cost is low.

The technical solution of the utility model is: the TV storage oscilloscope, comprise display circuit and writing circuit, and it is characterized in that display circuit is digital relative method decoding display circuit, mainly writes counter by getting, linage-counter, 17 ic chips 1, IC2, IC3, IC4, IC5, IC6, IC7, IC8, IC9, IC10, IC11, IC12, IC13, IC14, IC15, IC16, IC17, crystal oscillator, digital switch IC18 and screen select device to form.The screen of display circuit selects device to preset input to IC1, IC1 gets 4 address A9～A12 that preset control IC3,9 address A0～A8 of IC3 write counter control by getting, IC17 is by data terminal D0～D7 peek passing through IC15 of IC3, the row sign indicating number output terminal Q0～Q7 of IC16 and linage-counter carries out numeric ratio, the capable arteries and veins of IC4 and the field boundary arteries and veins of IC8 by IC9 synthetic synchronizing pulse, the vertical mark of IC5 and the slogan banner of IC7 by IC6 synthetic the scale signal, IC10 and IC11, IC13 connects, blocking-up mistranslation sign indicating number, IC15, after the signal interpretation of IC16 adds the error code blocking-up of IC10, export by IC11, after the scale signal of IC6 " gets " to add the error code blocking-up of IC10 non-through IC12, by IC13 output, anti-phase amplifier IC14 addition IC11, IC9, the output of IC13 is synthetic that vision signal is exported, the read-write control of IC2 control IC3 (

) end.The part that writing circuit can be common in the decoding display circuit, remainder is a custom circuit.

The utlity model has following characteristics: circuit is simple, does not need the support of auxiliary circuit; Cost is low, has higher performance; Has the large screen display under the high precision condition; Can utilize less storage space, the displaying contents of storage multi-screen is beneficial to the complete observation and the storage of transient process; The available television machine is made display, also can be connected video recording with video recorder, makes the long preservation of measuring-signal.

Fig. 1 is a circuit block diagram of the present utility model

Fig. 2 is digital relative method decoding display circuit figure of the present utility model

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

As shown in Figure 1 and Figure 2, oscillograph of the present utility model mainly is made up of digital relative method decoding display circuit (in the dotted line, being called for short the decoding display circuit) and writing circuit.The decoding display circuit is mainly write counter by getting, and linage-counter, 17 ic chips 1, IC2, IC3, IC4, IC5, IC6, IC7, IC8, IC9, IC10, IC11, IC12, IC13, IC14, IC15, IC16, IC17, crystal oscillator, digital switch IC18 and screen select device to form.The screen of decoding display circuit selects device to preset input to IC1, IC1 gets 4 address A9～A12 that preset control IC3,9 address A0～A8 of IC3 write counter control by getting, IC17 is by data terminal D0～D7 peek passing through IC15 of IC3, the row sign indicating number output terminal Q0～Q7 of IC16 and linage-counter carries out numeric ratio, the capable arteries and veins of IC4 and the field boundary arteries and veins of IC8 by IC9 synthetic synchronizing pulse, the vertical mark of IC5 and the slogan banner of IC7 by IC6 synthetic the scale signal, IC10 and IC11, IC13 connects, blocking-up mistranslation sign indicating number, IC15, after the signal interpretation of IC16 adds the error code blocking-up of IC10, by IC11 output, the scale signal of IC6 is exported by IC13 after IC12 " gets non-" to add the error code blocking-up of IC10, anti-phase amplifier IC14 addition IC11, IC9, the output of IC13, synthetic that vision signal is exported, the write-read control of IC2 control IC3 (

) end.The 8MHz clock of crystal oscillator is by 1,3 ends (because the displayed record control of IC18 / W=O, 1,3 end gatings) accesses the counting clock CLK end of writing counter, pulse front edge makes the counter addend change location Q0～Q8, and the output Q5Q6Q7Q8 of counting carry IC4 connects the counting clock CLK end of linage-counter, and the forward position makes linage-counter addend meter line number (row sign indicating number).IC4 forms horizontal synchronizing pulse, and IC8 forms the field boundary pulse by linage-counter, when the rows of counters sign indicating number is 10001000 * B, export a field boundary pulse (this be consider the field boundary flyback and effectively screen show the position and selected), row arteries and veins and field boundary arteries and veins are synthetic that the row field boundary is synchronous by IC9.IC4 also connects the counting clock CLK end of IC1, get A, B, C, D input that screen selects device ahead of the curve, address A9～A12 of (LD=0 is held in presetting of IC1, and IC1 is in and puts number state) control IC3, by changing output A, B, C, the D that screen selects device, reach the peek scope that changes IC3.

The 8MHz clock of crystal oscillator connects the triggering clock CLK end of IC17 simultaneously, the peek that makes IC17 with get write counter to change the location synchronous, carry out the in good time peek of IC3, (output of IC3 allows

=0, write-read control =1, IC3 is in the reading state) the row sign indicating number Q0～Q7 of the data that obtain from IC3 of IC17 and linage-counter is OC door in parallel by IC15 and IC16(IC15 and IC16) carrying out numeral relatively, data and row yard equate then have a signal interpretation to export.Begin scanning from the top of screen because television line is swept, scanning corresponding row sign indicating number in top is little, is an inverted image so such comparison interpretation method obtains.Circuit had added the one-level inverted image and has amplified before sampling storage for this reason, and what make that demonstration finally obtains is an erect image display waveform.

IC5 writes counter and forms vertical mark signal by getting, and IC7 forms the slogan banner signal by linage-counter, and by IC6 synthesize the scale signal; Row, field boundary synchronously and the Q8 of linage-counter end through IC10 synthetic the error code disabling signal; The output of signal interpretation (the common output of IC15 and IC16) and IC10, by IC11 synthetic the signal interpretation of blocking-up error code.Scale signal IC6 " gets non-" through IC12, with the output of IC10, by IC13 synthetic the scale signal of blocking-up error code.The scale signal of the signal interpretation of IC11, IC13 and row, the field boundary of IC9 are synchronous, by the anti-phase amplifier addition of IC14 synthetic the vision signal of TV.Vision signal connects the video input of televisor, is demonstrated the signal waveform of being stored by televisor.Also can add radio-frequency modulator, connect the antenna input of televisor, can show the measuring-signal waveform equally at the vision signal end.

Getting and writing counter is that 9 bit synchronization counters are triggered in the forward position; Linage-counter is that 9 312 system counters are triggered in the forward position; Ic chip 1 is 74LS161, and IC3 is 6264-10, and IC14 is LM318, and IC17 is 74LS374, and IC15 and IC16 are 74LS266, and all the other integrated packages are the general integrated package of 74LS series.

The writing circuit that matches with display circuit is write several variable frequency dividers by crystal oscillator, and digital switch IC18 gets and writes counter, IC4, and IC1 forms counting chain, is controlling address wire A0～A12 of IC3.During start-of-record, i.e. the rising front of displayed record control R/W by quenching pulse CLR of demonstration/recording controller output, makes to get and writes counter and IC1 zero clearing.Three control outputs writing the writing controller of several variable frequency dividers are: 1) write the control pulse by IC2 control IC3's

End; 2) the A/D clock connects the clock CLK end of IC21 and IC22, A, the analog input of B track are adjusted amplification by the variable simulation inverting amplifier of electric-level gain, its output meets the analog input end A/D IN of IC21, IC22 respectively, IC21, IC22 change data connect the D end of IC19, IC20 respectively, the three-state output Q of IC19, IC20 connects the data D end of IC3; 3) latch and the control signal of ternary control and single two track selector switchs and

/ W signal is controlled single two track writing controller jointly, and G and the OE end of IC19, IC20 controlled in its output again.Read-write state is by demonstration/recording controller

/ W signal is controlled, and decoding shows, the common sparing of writing circuit is crystal oscillator, IC18, gets and write counter, IC1, IC2, IC3, IC4.

Numeral relative method TV decoding procedure for displaying is: in a television line is swept, takes out all stored digital that a screen needs in turn, compares with the television line sign indicating number respectively, and equal then export shows signal, in comparison, form the shows signal that a television line is swept simultaneously; After having got a screen needed number storage, it is synchronous to export a row, linage-counter adds 1, the peek (being still all stored digital of this screen) that begins another row is again compared, and forms the shows signal of next line, and the peek of the another row of delegation relatively, export the shows signal of corresponding line simultaneously, up to the scanning of finishing a field boundary, it is synchronous to export a field boundary, begins the decoding output of next field boundary again.In decode procedure, the shows signal of Xing Chenging simultaneously, row, field boundary synchronizing signal and scale signal form vision signal by the anti-phase amplifier addition of IC14.Owing to added the scale signal in the TV signal, the linear error of television scanning is identical to the amount of nonlinearity and the offset direction of shows signal and scale signal, equivalent skew simultaneously, demonstration is compensated accurately, add TV and have very little non-linear demonstration, thereby reduced display error to greatest extent, made digit translation and scale that automatic correcting action be arranged, and made the TV screen demonstration can reach very high display precision.

Claims

1, a kind of TV storage oscilloscope, comprise display circuit and writing circuit, it is characterized in that display circuit is digital relative method decoding display circuit, mainly write counter by getting, linage-counter, 17 integrated package (IC1, IC2, IC3, IC4, IC5, IC6, IC7, IC8, IC9, IC10, IC11, IC12, IC13, IC14, IC15, IC16, IC17), crystal oscillator, digital switch (IC18) and screen select device to form, the screen of display circuit selects device to preset input to IC1, IC1 get 4 addresses of presetting control IC3 (A9～A12), 9 addresses of IC3 (A0～A8) write counter control by getting, (D0～D7) IC15 is passed through in peek to IC17 by the data terminal of IC3, the row sign indicating number output terminal (Q0～Q7) carry out numeric ratio of IC16 and linage-counter, the capable arteries and veins of IC4 and the field boundary arteries and veins of IC8 by IC9 synthetic synchronizing pulse, the vertical mark of IC5 and the slogan banner of IC7 by IC6 synthetic the scale signal, IC10 and IC11, IC13 connects, blocking-up mistranslation sign indicating number, IC15, after the signal interpretation of IC16 adds the error code blocking-up of IC10, by IC11 output, the scale signal of IC6 is exported by IC13 after IC12 " gets non-" to add the error code blocking-up of IC10, anti-phase amplifier IC14 addition IC11, IC9, the output of IC13, synthetic that vision signal is exported, the write-read control of IC2 control IC3 (

) end.

2, oscillograph according to claim 1 is characterized in that getting that to write counter be that 9 bit synchronization counters are triggered in the forward position.

3, oscillograph according to claim 1 is characterized in that linage-counter is that 9 312 system counters are triggered in the forward position.

4, oscillograph according to claim 1 is characterized in that ic chip 1 is 74LS161, and IC3 is 6264-10, and IC14 is LM318, and IC15 and IC16 are 74LS266, and IC17 is 74LS374, and all the other integrated packages are the general integrated package of 74LS series.